Method and device for quasi-frequency stepless start of synchronous motor

FIELD: all fields of national economy using heavy-power synchronous machines.

SUBSTANCE: proposed method and device that can be used, for instance, in gas industry for starting electric drives of gas-transfer units involve connection of excitation unit to field winding, determination of pre-start rotor position relative to stator windings, measurement of voltage across stator windings, current through stator windings, supply voltage and field winding current, evaluation of motor speed by electromotive force induced in stator windings and estimated by voltage across stator windings and current through stator windings, current pulse supply to stator windings with aid of thyristor voltage regulator by sending control signals to control outputs of mentioned voltage-regulator thyristors, regulation of parameter of current pulses supplied to stator windings and field current so that mean torque of machine were higher than motor moment of resistance.

EFFECT: reduced in-start thermal and mechanical loads and start-to-start intervals, enhanced number of starts and service life of motor.

2 cl, 3 dwg

The present invention relates to electrical engineering, and in particular to methods of starting of synchronous machines, and can be used for start-up, in particular, drives a large capacity centrifugal compressors gas compressor units.

There is a method of starting a synchronous machine with a polyphase armature winding connected to the frequency Converter and the single-phase winding of inductor [1]when serving polling pulses on one of the windings of the synchronous machine, determine the angular position of the inductor in the EMF induced in the other winding of the synchronous machine is not electrically connected with the first, define the group of gates of the frequency Converter, which must be enabled first, and include it with this questionnaire pulse serves two phase armature winding by inclusion of the group of valves of the inverter is measured EMF induced in the winding inductor, and remember it, turn off the valves of the Converter and configured interval include other phases of armature windings, measure the EMF induced in the winding of the inductor, and the measured values of EMF detect the angular position of the inductor.

This method of starting of synchronous machines as well as the inventive method kvazichastichnogm soft start synchronous motor, includes determining the angular position of the mouth is RA relative to the stator windings. However, the lack of voltage on the windings of the stator current in the windings of the stator supply voltage and the magnitude of the current in the excitation winding, determine the speed of rotation of the engine, install the inrush current and supply specified by current pulses in the stator winding leads to the reduction of technical and economic indicators of well-known method, in particular his large costs technical resource to execute starting of synchronous motor, which reduces the number of possible triggers.

There is a method of starting a synchronous machine [2] with the field winding on the rotor and a multiphase stator winding, in which the multi-phase stator winding during the whole period of the start connected to the primary of the mains frequency, and the excitation winding of the rotor to the quenching device and when the rotor of the synchronous machine podsyhanii rotation frequency of the excitation winding is disconnected from the quenching device and connect to the device excitation, during the period of to start the moment a rotor of the synchronous machine podsyhanii speed control the frequency and phase of the voltage of the primary outlet size inductional in the excitation winding of the rotor EMF frequency and phase current winding and regulate phase, led the rank and sign mentioned current and the associated magnetic flux in the rotor once during each half-period of relative frequency inductional in the excitation winding of the rotor EMF in accordance with the law

where: I_R- rotor current;

θ - the load angle of a synchronous machine;

I_Rn- rated current rotor;

ω_t- the current rotational speed of the rotor;

ω_Ccyclic frequency of the power supply outlet,

during the time in which the axis of the magnetic flux of the stator and the magnetic flux of the rotor are relatively synchronous, quasisynchronous the relative positions within the load angle of a synchronous machine is determined by the matching of the control parameters.

This method of starting of synchronous machines as well as the inventive method kvazichastichnogm soft start synchronous motor, includes the determination of the rotation frequency of the rotor of the synchronous machine, the mains voltage and current in the excitation winding connection winding to the quenching resistance. However, the lack of measurement of voltage and current in the windings of the stator, install the inrush current and supply specified by current pulses in the stator winding dramatically reduces the technical-economic indicators of well-known method, in particular limits the number of possible triggers a synchronous motor, as described in the known method steps to reach podsyhanii frequencies are widely known resource-intensive asynchronous pic is b starting of synchronous machines.

The closest in technical essence is a method pulse start synchronous machines [3]including the determination of the position of the rotor relative to the stator windings, connecting the field winding exciter, the supply to the stator winding current pulses synchronously with the position of the rotor by feeding pulses to the control terminals of the thyristors of the thyristor voltage regulator, the parameters of the current pulses supplied to the stator winding and excitation current set so that the average torque of the machine was more of a drag torque of the machine, while the machine smoothly adjust by changing the parameters of the pulses and pauses between them.

This method pulse start synchronous machines as well as the inventive method kvazichastichnogm soft start synchronous motor includes connecting the exciter to the excitation winding, the supply to the stator winding current pulses through the pulse supply to the control terminals of the thyristors of the thyristor voltage regulator, the regulation of the parameters of the pulses supplied to the stator winding and excitation current so that the average torque of the engine is larger than the drag torque of the engine. However, the lack of voltage on the windings of the stator current in the windings of the stator supply voltage and led the ranks of the current in the excitation winding, determine the speed of motor rotation frequency signals EMF induced in the windings of the stator, a preliminary determination before starting the engine simultaneously with the determination of the angular position of the rotor relative to the stator windings, a pair of thyristors of the thyristor voltage regulator, which must be enabled first, install the inrush current and supply pulses to control the conclusions of the respective thyristors of the thyristor voltage regulator in accordance with the procedure and parameters defined by a pair of thyristors to which you want to apply the pulses of the first and second specified parametrically rate increasethe rotation speed of the engine, provided that the starting current is equal to the given value, and after the engine rotation speed is equal to 0.05·n_withwhere n_with- the rated speed of the synchronous motor, determine the pairs of thyristors that you want to include, and the moment of their inclusion on the actual position vector of the mains voltage and flux vector of the stator, and when the engine rotation speed is equal to (0,8-0,90)·n_with, connect to the excitation winding of the quenching resistance and the unit shut excitation and feed thyristor voltage regulator control signals in series with a frequency of 50 Hz so that the pad that is was equal to the given value, affects the technical-economic indicators of well-known way of start, in particular has a great time of start and due to heating of the engine because this increases the duration of the time interval between start-UPS and limited the number of possible engine starts.

The closest to the technical nature of the claimed device is a device pulse start synchronous machine with three-phase stator winding and a single-phase rotor winding [3]containing thyristor voltage regulator, consisting of three pairs of thyristors connected in opposite, respective outputs of the thyristor voltage regulator is connected to a three phase stator winding of the synchronous machine, exciter, which is connected to the rotor winding of the synchronous machine, three-phase sensor instantaneous current of the windings of the stator, which is included in the circuit of the respective windings of the stator, three-phase average current sensor stator windings, which are also included in the circuit of the respective windings of the stator, sensor the position of the rotor, which is connected with the rotor of the synchronous machine, the unit inrush current control unit, to the inputs of which are connected the outputs of the sensor instantaneous current of the windings of the stator, sensor medium voltage stator windings, the position sensor rotor and the output of the generator current, the terminals of the mains, which are connected to soo the relevant pairs of thyristors thyristor voltage regulator, management conclusions which are connected to corresponding outputs of the control unit, which consists of the first element, to the input of which is connected to the output of the sensor instantaneous value of a current block comparison of the currents, one input of which is connected to the output of the current sensor and the second output unit inrush current, current transformer in a single signal, to the input of which is connected to the output of the Comparer currents, the second element, the input connected to the inverter output current in a single signal, the first element And to the inputs of which are connected the outputs of the first and second elements is NOT, the second and third elements, And the first inputs of which are connected with the output of the first element And to the second input of the second element And connected to the first sensor output of the rotor position, the second output of which is connected to a second input of the third element And the outputs of the second and third elements are the outputs of the control unit.

This device pulse start synchronous machine with three-phase stator winding and a single-phase rotor winding as claimed device kvazichastichnogm soft start synchronous motor with three-phase stator winding and a single-phase rotor winding, contains a thyristor voltage regulator, consisting of three pairs of thyristors connected in opposite, which is adequate outputs of the thyristor voltage regulator is connected to a three phase stator winding of the synchronous motor, block excitation (pathogen), which is connected to the rotor winding of a synchronous motor, three-phase current sensor (instantaneous current) stator windings, which is included in the circuit of the respective stator windings, the generator start-up current, the control unit, to the inputs of which are connected the outputs of the current sensor windings and the output unit inrush current, the terminals of the mains supply to the control conclusions thyristor voltage regulator connected to the corresponding outputs of the control unit. However, the absence of three-phase switch, three-phase sensor voltage on the windings of the stator, three-phase sensor supply voltage and connections of new elements with each other and with known elements affects the technical and economic indicators of the start, in particular, the device has a large start-up time and due to heating of the engine because this increases the duration of the time interval between start-UPS and limited the number of possible engine starts.

The basis of the present invention the task is improving the way kvazichastichnogm soft start synchronous motor and device kvazichastichnogm soft start synchronous motor for its implementation through the introduction of new operations in the way and new elements in the device, which improves the efficiency with which Narodnogo of the engine by reducing thermal and mechanical loads at start-up, shortening the interval of time between launches, increasing the number of possible triggers and duration of its lifetime.

The problem is solved in that in the known method kvazichastichnogm soft start synchronous motor with three-phase stator winding connected to the thyristor voltage regulator, connected to the mains supply and the field winding on the rotor, including the connection of power excitation to the field winding, the determination of the initial position of the rotor relative to the stator windings, the flow in the stator winding current pulses using a thyristor voltage regulator by issuing control signals to control terminals of the thyristors of the thyristor voltage regulator, the regulation of the parameters of the current pulses supplied to the stator winding and excitation current so that the average torque of the engine was more time the resistance of the engine, according to the invention additionally measure the voltage on the windings of the stator current in the windings of the stator, the supply voltage and the current in the excitation winding, determine the speed of the motor rotation frequency signals EMF induced in the windings of the stator EMF signals are determined by the voltage on the windings of the stator and the current in the windings of the stator of the engine before starting the engine one is a belt with determining the angular position of the rotor relative to the stator windings define a pair of thyristors of the thyristor voltage regulator, you want to include first, establish the magnitude of inrush current, then include a block of excitation and after the set time begins to periodically apply the pulses to the control terminals of the thyristors of the thyristor voltage regulator, with start-up specific thyristors, which serves the control pulses are defined by a pair of thyristors, which should apply to first pulses at a corresponding position of the voltage vector network then serves impulses have one or two pairs of thyristors, further applying pulses is terminated, and a new cycle supply control pulses to the thyristors of the thyristor voltage regulator is determined by the position vector of the mains voltage and the specified parametrically the rate of increase of engine speed, provided that the starting current is equal to the given value, when the engine rotation speed is equal to 0.05·n_withwhere n_with- the rated speed of the synchronous motor, begin to determine the actual mutual spatial orientation in the plane of the cross-section of the engine vector of the mains voltage and flux vector motor, which define a pair of thyristors that you want to include moments of their inclusion considering the fact that the starting current Rav the n-set value, and the moment of the pulse, when the engine rotation speed is equal to (0,8÷0,90)·n_withfrom winding off the block excitation and connect to it the quenching resistance, and the thyristor voltage regulator serves the control signals in series with a frequency of 50 Hz so that the starting current was equal to the given value, when the engine podsyhanii speed equal to (0,95÷0,98)·n_with, continuum thyristor voltage regulator, and the fact that the device kvazichastichnogm soft start synchronous motor with three-phase stator winding and the phase winding rotor comprising a thyristor voltage regulator, consisting of three pairs of thyristors connected in opposite, the corresponding output conclusions thyristor voltage regulator is connected to a three phase stator winding of the synchronous motor, the power excitation, the first and second outputs of which are connected with the leads of the excitation winding of the rotor of the synchronous motor, three-phase current sensor stator windings, the phase of which is included in the circuit connections of the respective stator windings corresponding to the output pins of the thyristor voltage regulator, the generator start-up current, the control unit to the fifth input of which is connected to the outputs of the current sensor stator windings, the second inputs connected to the outputs of the generator current, to the control terminals of the thyristors of the thyristor voltage regulator connected to respective first outputs of the control unit, the terminals of the mains, which are connected with the corresponding input pins of the thyristor voltage regulator, according to the invention introduced a three-phase voltage sensor windings of the stator, three-phase sensor supply voltage and three-phase switch corresponding to the first conclusions of which are connected to respective terminals of the mains and to the corresponding inputs sensor supply voltage, respective outputs of which are connected to respective first inputs of the control unit, the second outputs of which are connected to control inputs of the block excitation, the first and second outputs of which are connected to third inputs of the control unit, the fourth input which is connected to the outputs of the three-phase sensor voltage stator windings, the input of which is connected to respective windings of the stator and the corresponding second pins of the three-phase switch.

Introduction to the way kvazichastichnogm soft start synchronous motor with three-phase stator winding and a single-phase winding on the rotor, additional measurements voltage on the windings of the stator current in the windings of the stator supply voltage and residual current of webmode excitation, determine the speed of rotation of the motor voltage on the windings of the stator and the current in the windings of the stator, definitions before starting the engine angular position of the motor rotor relative to the stator, and a pair of thyristors of the thyristor voltage regulator, which must be enabled first, install the inrush current, the turn after this block of excitation and after the set time of submission of the pulses to control the conclusions of the respective thyristors of the thyristor voltage regulator with the necessary parameters and in the order defined by a pair of thyristors to which you want to apply the pulses of the first, and given parametrically by the rate of increase of engine speed, provided that the starting current is equal to the given value, and when reaching the engine rotation speed is equal to 0.05·n_with, determine the actual position vector of the mains voltage and flux vector of the stator to define who thyristors that you want to include, and the moments of their inclusion under the condition that the starting current is equal to the given value, and when the engine rotation speed is equal to (0,8÷0,90)·n_with, connect to the excitation winding of the quenching resistance and the unit shut excitation and feed thyristor voltage regulator control signals posledovatel is but with a frequency of 50 Hz is also provided, that inrush current is equal to the given value, and the bypass when the engine podsyhanii speed (0,95÷0,98)·n_witha thyristor voltage regulator allows to increase the efficiency of the synchronous motor by reducing the time interval between start-UPS and increase the resource starts and the duration of its lifetime by reducing thermal and mechanical loads during the start.

Introduction to device kvazichastichnogm soft start synchronous motor with three-phase stator winding and a single-phase rotor winding three-phase sensor voltage windings of the stator, three-phase sensor supply voltage, three-phase switch and new relationships allows to implement the proposed method and its use to improve the efficiency of the synchronous motor by reducing the time interval between start-UPS and increase the resource starts and the duration of its lifetime by reducing thermal and mechanical loads during the start.

The drawings are shown:

figure 1 - diagram of the device kvazichastichnogm soft start synchronous motor;

figure 2 is a vector representation of the electromagnetic quantities in the plane of the cross-section of the engine to explain the proposed method of starting synchronous engine in the La.

The device kvazichastichnogm soft start synchronous motor 1 (figure 1) with three-phase stator winding 2 phase excitation winding on the rotor 3 includes a three-phase switch 4, the three-phase sensor supply voltage 5, unit inrush current 6, thyristor voltage regulator 7, which is a three-phase set counter included pairs of thyristors (+A, +B, +C-C), the control unit 8, the first outputs of which are connected to respective control terminals of the thyristors of the thyristor voltage regulator 7, a three-phase current sensor in the windings of the stator 9, the three-phase voltage sensor on the windings of the stator 10, the inputs of which are connected to the corresponding second conclusions three-phase switch 4, corresponding to the output pins of the thyristor voltage regulator 7 and the respective windings of the stator 2, in the chain between the corresponding stator winding 2 with the corresponding output output thyristor voltage regulator 7, included the corresponding phase current sensor 9, the outputs of which are connected to the fifth input of the control unit 8, the fourth inputs of which are connected to the outputs of the three-phase voltage detector 10, block excitation 11, terminals mains supply 12, which are connected with the corresponding first conclusions of the three-phase switch 4, with suitable the mi the input pins of the thyristor voltage regulator 7 and to the corresponding inputs of the three-phase voltage detector 5, the outputs of which are connected with the first inputs of the control unit 8, the third input of which is connected respectively to the first and second leads of the excitation winding 3 and the first and second outputs of the block excitation 11, the control inputs of which are connected with the second output control unit 8, to the second inputs of which are connected the outputs of the unit starting current 6. Block excitation 11, the exemplary embodiment contains the exciter 13, single pole switch 14, the quenching resistor 75, the first output of which is connected to the second output pole of the switch 14, the first output of which is connected to the first output of the exciter 13 and the first output unit excitation 11, to the second output of which is connected to the second output of the exciter 13 and the second output of the quenching resistor 15, the control 16, which controls a single-pole switch 14 and the inputs of which are connected to control inputs of the exciter 13 and control unit excitation 11.

The control unit 8 is a microprocessor-based control device, in a memory which is programmed to control the operation of the engine, in particular a control program to start the engine.

As a SPST switch 14 may be used any switching element such as a relay contact or thyristors, in accordance with what ele is UNT used as switch 14, select the type of control 16.

The essence of the proposed method of starting synchronous motor is that in the stator winding serves current, the frequency of which varies from 0 Hz to podsyhanii frequency set at specific points in time to the law, and then start continues as widely known asynchronous soft start on poderjannyh frequencies.

To explain the proposed method of starting synchronous motor figa and 2B shows a vector representation of electromagnetic quantities in the plane of the cross-section of the engine relative to the axis of the winding machine +A,, +B,-A, +C,-B, along which aims magnetomotive force MDS (vector currents) when current flows through the corresponding winding considering the sign of the current. If the current flows along multiple windings, the resulting MDS (resulting vector current) is determined by the geometric summation phase MDS

On figa shows the flux vector motorvector mains voltageand the vector of the current pulse when applying control pulses to the thyristors With a+at the specified position vector. In this case, the respective windings will begin to leak currents, which then falls to zero and stops because of the unilateral conductivity shooting the stores. As a result of leaking currents in the motor windings generate a current pulse, the vector of which is shown in figa. Its value will be equal to

where- sorprende inductive resistance of the motor along the longitudinal axis;

- sorprende inductive resistance of the engine along the transverse axis;

U is the amplitude of the voltage vector network;

θ_u- the angle between the vector voltage and the axis vector of the current pulse (see figa). The chart shows that changing θ_uyou can adjust the value of the current pulse.

If, enabling thyristors-C+B, then submit the control pulses to the thyristors +V And you will get consistently two vectors of current pulses, which can be replaced by one resulting vector, shown in figb. If the angles θ_uwhen turning on the thyristors+and +In-And to change the position of the result vector of the current will change. Of the above, it follows that during the period of the mains voltage by connecting two or three pairs of thyristors with angles management respectively θ_u1and θ_u2or θ_u1that θ_u2and θ_u3you can generate the vector current pulse of a given magnitude and any given position on the flat the particular cross-section of the engine. If you consistently include more than two pairs of thyristors, the notion of the result vector of the current pulse, it is advisable to replace the vector current, moving with a speed of 2πf electrical radians per second in a particular sector on the plane of the cross-section of the engine. So, by measuring the voltage at the input of the thyristor voltage regulator, we may during the period of the mains voltage to formulate the desired vector current vector of the current pulse), by enabling the respective thyristors of the thyristor voltage regulator with the corresponding corners of the control.

The moment the engine is created by the interaction of the vector of the stator current and flux vector of the rotor is determined by the formula

If the angle between the vectors of the current and flux in the plane of the cross-section is in the range of 0÷π, musculoskeletal (positive). If the specified angle is less than 0 or more π, the torque - brake (negative). The position of the flux vector or EMF (vector flux and EMF shifted to the corner π/2) is determined by calculation based on the measurement results of the voltage at the terminals of the windings of the stator and the current in the windings of the motor stator, while the method of determining the position of a real vector of the jet stream in the plane of the cross section on the " signals voltage (EMF) is qualitatively more accurate what is the definition of the vector position of the jet stream in the plane of the cross-section of the motor according to the signals of the sensor of angular position of the rotor, since the rotor flux is determined not only by the excitation current, but also the stator current and the currents in the damper contours on the rotor.

To accelerate the motor at start-up it is necessary that the average motor torque was always positive, but if this still will not occur at some points in time the negative moment, reduced losses, reduced mechanical and thermal loads on the engine, and this can be accomplished by continuously monitoring the position vector of the stator current and flux vector motor and installing this pulse supply voltage on the stator winding switching thyristors thyristor voltage regulator, in which the vector of the stator current, the resulting current flow through the thyristors of the thyristor voltage regulator, will be ahead of the flux vector by an angle greater zero, but smaller π.

As mentioned above, the signals of the sensor voltage can be determined in each moment of time, what position in the plane of the cross-section of the machine may take the vector of the stator current. The signals of the sensor voltage on the windings of the stator and the signals of the current sensor in the windings of the stator can be calculated in each the first time, what position in the plane of the cross-section of the engine is the flux vector. As the voltage vector network rotates with synchronous speed - n_withand the flux vector of the rotor rotates with the current speed of the engine is n, then the relative position vectorsandchanged to 360° (2π) slip frequency is proportional to n_with-n. Thus, based on the above, you can identify those times when you want to include a specific thyristors thyristor voltage regulator, so that the angle between the vectorsandwas positive and the magnitude was close to zero. If as a rotation vectorto include consistently the thyristors of the thyristor voltage regulator, the angle between the vectorsandwill increase when this angle will be close to π, it is necessary to stop the supply of control pulses to the thyristors of the thyristor voltage regulator and the stator current will be zero. After a time equivalent in electrical radians valuewhen the vectorsandagain mates, will start the Tcl formation of the stator current, performed similar to that described above. The result is a temporary location durationwhen the motor torque is positive, and the same plot, where the moment is zero. The average time is always positive.

To implement this method, a pre-determined spatial arrangement of the excitation winding of the rotor relative to the stator windings, produce magnetization of the engine and runs it start in the first stage is carried out at a rotation speed of the engine in the frequency region from 0 to 0.05·n_with(2,5 Hz) second - when the engine speed is in the range of frequencies from 0.05·n_withto (0,8÷0,90)·n_with(from 2.5 Hz to 40-45 Hz), the third - when the motor rotation speed in the frequency range from 0.8 to 0,90)·n_withto n_with(from 40 to 45 to 50 Hz). On the first two phases of the motor is excited, and the control pulses are only the thyristors of the thyristor voltage regulator, which, firstly, can conduct current in accordance with the current phase voltage, secondly, create the vector current in the windings of the stator, not exceeding modulo the size of the scheduled starting current and advanced flux vector motor at an angle in the range of 0÷π electrical radians. At the first stage of the first pair of pulses is fed to the control input V is s a pair of thyristors, which are determined in accordance with the spatial location of the excitation winding of the rotor relative to the stator windings, and then switching on of the thyristors of the thyristor voltage regulator is defined by the parametric setting changes the speed of the engine, for example, linearly, in particular given the amplitude of the stator current and the excitation current. In the second stage, the switching on of the thyristors of the thyristor voltage regulator and the sequential number of the thyristors in one cycle of the formation of the current set by mutual spatial orientation of the vectors of the mains voltage and flow of the engine, the position of which is determined by the voltage on the windings of the stator and the current in the windings of the motor stator. The third stage produces a connection to the excitation winding of the quenching resistance and disconnection of the pathogen, i.e. provide damping of the excitation current and, in addition, the thyristor voltage regulator serves the control signals in series with a frequency of 50 Hz so that the starting current was equal to the given value. At all stages of the start-up of the amplitude of the stator current is controlled by a closed system of automatic regulation of the current.

The proposed method kvazichastichnogm soft start synchronous motor is implemented as about what atom.

Pre-unlock the three-phase switch 4 and the stator winding 2 of the synchronous motor 1 is connected through a thyristor voltage regulator 7 to the terminals 12 of the mains, the rotor winding of the motor 3 is connected to the AC excitation is 11, set by using the knob current 6 inrush current. Further, when the fixed rotor perform the determination of its spatial position relative to the windings of the stator. For this purpose control outputs each pair of thyristors: -B+A, +A,+B, +B, -a+C, a +C-b a thyristor voltage regulator 7 each period of the mains voltage during the six periods served alternately control pulses. The respective thyristors are opened and the corresponding windings of the stator 2 flow pulse currents, which Inuktitut EMF in the winding on the rotor 3 of the motor. The amplitude and sign inductional EMF at each feed control pulses are determined by the control unit 8 and remembered them. The amplitude and sign of the voltage signals at the terminals of the excitation winding 3 with respect to the direction of the excitation current control unit 8 determines the spatial orientation of the field winding on the rotor 3 (the spatial arrangement of the rotor relative to the stator) relative to the phase windings of a stator 2 and a pair of thyristors to which you want poda is ü control pulses. Then, the control unit 8 issues on their second outputs a command, which opens the switch 14 and enables the exciter 13. After the time required for excitation (magnetization) of the engine (this time is 2-5 with depending on the type synchronous motor), begin the actual start of the engine, which, as stated above, is produced in three stages. After the time of magnetization of the control unit 8 starts to produce its first output pulses which are fed to the control terminals of the thyristors of the thyristor voltage regulator 7. The first pair of pulses is fed to the control inputs of the pair of thyristors determined by the control unit 8 in accordance with the spatial location of the excitation winding of the rotor 3 relative to the stator windings 2, and then switching on of the thyristors of the thyristor voltage regulator 7 is determined by the control unit 8 in accordance with the parametric setting changes the speed of the engine, for example, linearly, at a specific given value of the amplitude of the stator current set by the setting device of the current 6, and excitation current, set by the block excitation 11. Since the issuance of the control pulses of the control unit 8 controls the speed of motor rotation frequency signals EMF induced in the windings of the stator 2, and designated p. the signals from the outputs of the current sensors 9 and the voltage in the windings 10 of the stator. When the engine rotation speed is equal to 0.05·n_with(2,5 Hz), begins the second stage of start-up, on which the switching on of the thyristors of the thyristor voltage regulator 7, the control unit 8 sets in accordance with the spatial orientation of the vector of the mains voltage and flux vector motor, a position which he determines the sensor's signal voltage on the windings of the stator 10 and the current in the windings of the stator 9. When the engine rotation speed is equal to (0,8-0,90)·n_with(40-45 Hz), begins the third stage of start-up, where the control unit 8 by the signal from its second output connects to the excitation winding on the rotor 3 a quenching resistor 15, thus closing the switch 14, and disables the exciter 13 block excitation 11, and starts to produce control pulses sequentially to the thyristors of the thyristor voltage regulator 7 with a frequency of 50 Hz by adjusting the amplitude of the current in accordance with the value given by the unit inrush current 6. When the engine podsyhanii speed - (0,95-0,98)·n_withcontinuum thyristor voltage regulator 7, closing the three-phase switch 4, and then synchronize the operation of the engine with the supply chain.

The proposed device kvazichastichnogm soft start synchronous motor can be is used for sequential starting of synchronous motors, member mounted on the object, such as compressor stations. For this purpose it is necessary in the circuit connection device kvazichastichnogm soft start synchronous motor synchronous motor and mains enter the appropriate switching devices.

Sources of information

1. USSR author's certificate No. 921006, CL H 02 P 1/50, BI No. 14, 1982.

2. RF patent № 2096902, CL H 02 P 1/50, IB No. 32, 1997.

3. Yeovilton, Gnter-Ghazaryan, Iddawela, Vinarov. Method pulse start synchronous machines. M: "Electrical engineering", 1987, No. 3, pp.33-36.

1. The way kvazichastichnogm soft start synchronous motor with three-phase stator winding connected to the thyristor voltage regulator, connected to the mains supply and the field winding on the rotor, including the connection of power excitation to the field winding, the determination of the initial position of the rotor relative to the stator windings, the flow in the stator winding current pulses using a thyristor voltage regulator by issuing control signals to control terminals of the thyristors of the thyristor voltage regulator, the regulation of the parameters of the current pulses supplied to the stator winding and excitation current so that the average torque of the engine is larger than the drag torque of the engine, characterized those who, what additional measure voltage on the windings of the stator current in the windings of the stator, the supply voltage and the current in the excitation winding, determine the speed of the motor rotation frequency signals EMF induced in the windings of the stator EMF signals are determined by the voltage on the windings of the stator and the current in the windings of the stator of the engine before starting the engine, simultaneously with the determination of the angular position of the rotor relative to the stator windings, define a pair of thyristors of the thyristor voltage regulator, which must be enabled first, establish the magnitude of inrush current, then include a block of excitation and after the set time begins to periodically apply the pulses to control conclusions thyristors thyristor voltage regulator, with start-up specific thyristors, which serves the control pulses are defined by a pair of thyristors, which should apply to first pulses at a corresponding position of the voltage vector, then served impulses have one or two pairs of thyristors, further applying pulses is terminated, and a new cycle supply control pulses to the thyristors of the thyristor voltage regulator is determined by the position vector of the mains voltage and the specified parametrically rate increase soon the ti motor rotation provided that inrush current is equal to the given value, when the engine rotation speed is equal to 0.05·n_cwhere n_c- the rated speed of the synchronous motor, begin to determine the actual mutual spatial orientation in the plane of the cross-section of the engine vector of the mains voltage and flux vector motor, which define a pair of thyristors that you want to include moments of their inclusion considering the fact that the starting current is equal to the given value, and the time of removal of the pulse, when the engine rotation speed is equal to (0,8-0,90)·n_cfrom winding off the block excitation and connect to it the quenching resistance, and the thyristor voltage regulator serves the control signals in series with a frequency of 50 Hz so that the starting current was equal to the given value, when the engine podsyhanii speed equal to (0,95-0,98)·n_c, continuum thyristor voltage regulator.

2. The device kvazichastichnogm soft start synchronous motor with three-phase stator winding and the phase winding rotor comprising a thyristor voltage regulator, consisting of three pairs of thyristors connected in opposite, the corresponding output conclusions thyristor voltage regulator connected to tre the phase of the stator winding of the synchronous motor, the power excitation, the first and second outputs of which are connected with the leads of the excitation winding of the rotor of the synchronous motor, three-phase current sensor stator windings, the phase of which is included in the circuit connections of the respective stator windings, corresponding to the output pins of the thyristor voltage regulator, the generator start-up current, the control unit, to the fifth input of which is connected to the outputs of the current sensor windings, and second inputs connected to the outputs of the generator current to the control terminals of the thyristors of the thyristor voltage regulator connected to respective first outputs of the control unit, the terminals of the mains, which are connected with the corresponding input pins of the thyristor voltage regulator, characterized in that introduced three-phase voltage sensor windings of the stator, three-phase sensor supply voltage and three-phase switch corresponding to the first conclusions of which are connected to respective terminals of the mains and to the corresponding inputs sensor supply voltage, respective outputs of which are connected to respective first inputs of the control unit, the second outputs of which are connected to control inputs of the block excitation, the first and second outputs of which are connected to third inputs of the control unit, the fourth inputs catalogoptions to the outputs of the three-phase sensor voltage stator windings, the inputs of which are connected with the respective windings of the stator and the corresponding second pins of the three-phase switch.