Method for control of induction frequency-controlled electric drive with short-circuited rotor and tracking system for its realisation


H02P27/10 - CONTROL OR REGULATION OF ELECTRIC MOTORS, GENERATORS, OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS (structure of the starter, brake, or other control devices, see the relevant subclasses, e.g. mechanical brake F16D, mechanical speed regulator G05D, variable resistor H01C, starter switch H01H; systems for regulating electric or magnetic variables using transformers, reactors or choke coils G05F; arrangements structurally associated with motors, generators, dynamo-electric converters, transformers, reactors or choke coils, see the relevant subclasses, e.g. H01F, H02K; connection or control of one generator, transformer, reactor, choke coil, or dynamo-electric converter with regard to conjoint operation with similar or other source of supply H02J; control or regulation of static converters H02M)
H02P27/06 - CONTROL OR REGULATION OF ELECTRIC MOTORS, GENERATORS, OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS (structure of the starter, brake, or other control devices, see the relevant subclasses, e.g. mechanical brake F16D, mechanical speed regulator G05D, variable resistor H01C, starter switch H01H; systems for regulating electric or magnetic variables using transformers, reactors or choke coils G05F; arrangements structurally associated with motors, generators, dynamo-electric converters, transformers, reactors or choke coils, see the relevant subclasses, e.g. H01F, H02K; connection or control of one generator, transformer, reactor, choke coil, or dynamo-electric converter with regard to conjoint operation with similar or other source of supply H02J; control or regulation of static converters H02M)

FIELD: electricity.

SUBSTANCE: in the method to control a frequency-controlled induction electric drive with a short-circuited rotor there is a setter used arranged as a relay controller, from which a signal of optimum accuracy arrives to an input of frequency converter speed control. A tracking system comprises a frequency converter implementing vector control, an induction motor with a short-circuited rotor. The setter comprises a sensor of phase currents, a sensor of instantaneous speed signal value, a sensor of phase voltages, a converter of current phase number, a vector-analyser, a converter of voltage phase number, rotators of current and voltage, a unit of parametric coefficients, a unit of switching function coefficients, a unit of summators, a unit of multiplication, a summator, a unit of setting signals, a unit to produce a setting signal for rotor flux linkage and an appropriate coefficient of PI-controller, a unit to produce a setting signal for rotor flux linkage and an appropriate PI-controller coefficient, a relay with high switching frequency, a scaling unit, a multiplier, a selector and a switch connected as specified in application materials.

EFFECT: production of control of optimum accuracy over speed of shaft rotation in a frequency-controlled asynchronous electric drive with a short-circuited rotor.

2 cl, 1 dwg

 

The invention relates to a frequency-controlled electric drives, in particular to the class of frequency-controlled induction motor drives, and can be used in conjunction with industrial-produced by frequency converters.

Known similar methods of controlling a frequency-controlled induction motor drives based on the use of standard PI, PID controllers in the control channel speed asynchronous motor [V.V. Rudakov, IGOR Stolyarov, Dachau VA Asynchronous drives with vector control. - L.: Energoatomizdat, 1987; Usoltsev A.A. Vector control of induction motors. / Tutorial. St. Petersburg: SPbGU ITMO, 2002].

Known ways of controlling a frequency-controlled induction motor as a prototype of the selected method, based on the use of frequency-controlled asynchronous electric drive with squirrel-cage rotor with vector control with PI controller in the control channel speed. At the entrance of the specified Governor is the difference between the velocity signal (coming from the unit, made in the form of an automatic potentiometer supplied with a frequency Converter and a signal from the sensor shaft rotation of an induction motor [V.V. Rudakov, IGOR Stolyarov, Dachau Century is. Asynchronous drives with vector control. - L.: Energoatomizdat, 1987; Usoltsev A.A. Vector control of induction motors. / Tutorial. St. Petersburg: St. Petersburg state University, 2002; Manual frequency converters series VECTORFLUX™ VFB and VECTORFLUX™ VFX. Document number: 01-1887-01, document Version: r4. Release date: 2004-03-25, © Copyright Emotron AB 2004].

The disadvantage of the method of controlling a frequency-controlled induction motor drives is the inability to maintain optimum accuracy values of the rotation speed of the drive.

Known similar servo control system frequency-controlled induction motor drives based on the use of the frequency Converter in conjunction with an induction motor, in which the frequency Converter uses the standard PI, PID controllers in the control channel speed asynchronous motor [V.V. Rudakov, IGOR Stolyarov, Dachau VA Asynchronous drives with vector control. - L.: Energoatomizdat, 1987; Usoltsev A.A. Vector control of induction motors. / Tutorial. St. Petersburg: SPbGU ITMO, 2002].

The disadvantage of analog is an error when the control shaft rotation speed of an induction motor [Klevtsov AV frequency Converters AC. A practical guide for the in the of enerav. Tula: the Vulture, 2008; MITSUBISHI ELECTRIC frequency Inverters FR-A 540 EC and FR-A540 L EU. Technical catalogue 2002/2003; http://vesper.ru/catalog/invertors/e3-9100/-rukovodstvo manual].

Known servo control systems frequency-controlled induction motor as a prototype of the selected system based on the use of frequency converters with vector control together with asynchronous motor with squirrel-cage rotor and the sensor shaft rotation speed of the engine. The frequency Converter has a PI controller in the speed control shaft. At the entrance of the specified Governor is the difference between the velocity signal (coming from the unit, made in the form of an automatic potentiometer supplied with a frequency Converter and a signal from the sensor shaft rotation of an induction motor [V.V. Rudakov, IGOR Stolyarov, Dachau VA Asynchronous drives with vector control.- HP: Energoatomizdat, 1987; Usoltsev A.A. Vector control of induction motors / tutorial. St. Petersburg: St. Petersburg state University, 2002; Manual frequency converters series VECTORFLUX™ VFB and VECTORFLUX™ VFX, document Number: 01-1887-01, document Version: r4. Release date: 2004-03-25, © Copyright Emotron AB 2004].

The disadvantage of the prototype is the presence of errors while maintaining the rotation speed VA is and asynchronous motor at the specified level [Klevtsov AV Frequency converters AC. A practical guide for engineers. Tula: the Vulture, 2008; MITSUBISHI ELECTRIC frequency Inverters FR-A 540 EC and FR-A540 L EU. Technical catalogue 2002/2003; http://vesper.ru/catalog/invertors/e3-9100/-rukovodstvo manual (in PDF); Usoltsev A.A. Vector control of induction motors / tutorial. St. Petersburg: SPbGU ITMO, 2002].

The technical task of the present invention is to obtain an optimal accuracy of the speed control shaft of the actuator due to the introduction of a unit of signal speed of rotation of the shaft of the actuator, the signal of which is fed to the reference input of the PI controller located in the control channel speed frequency-controlled asynchronous electric drive with squirrel-cage rotor.

The problem is solved due to the fact that in the method of controlling asynchronous frequency-adjustable electric drive with squirrel-cage rotor, the signal at the input of the speed control shaft rotation actuator served with the unit, made in the form of a relay controller operating in the sliding mode, which receives the amount of the difference of the reference signals of the level coordinate drive and feedback signals on respective coordinates, multiplied by appropriate weighting factors.

In h is emeu system unit signal of the rotation speed of the drive is made in the form of a relay controller containing the phase current sensor, the sensor instantaneous speed signal, the sensor phase voltages, the Converter of the number of phases current, vector analyzer, Converter number of phases voltage, rotor current, rotor voltage, the unit of parametric coefficients, a block of coefficients switch function block adders, block multiplication, the adder block of the reference signals, the unit works reference signal of the rotor flux linkage and the corresponding proportional coefficient of the PI controller, the unit works signal of the speed of rotation of the shaft of the actuator and the corresponding proportional coefficient of the PI controller, relay with high switching frequency, the scaling block containing the maximum velocity signal rotation of the shaft of the actuator, the multiplier, the switch and the switch; sensor output phase currents connected to the input transducer of the number of phases current, the sensor output phase voltage connected to the input transducer of the number of phases voltage, the output of the inverter of the number of phases current, and the output of the sensor's instantaneous speed signal is connected to the input vector analyzer, the output of the inverter of the number of phases current, and the output vector analyzer connected to the input of the rotator current, the output vector analyzer and the output transducer of the number of phases n is the voltage connected to the input of the rotator voltage, the outputs of work package reference signal of the rotor flux linkage and the corresponding proportional coefficient of the PI controller and the unit works signal of the speed of rotation of the shaft of the actuator and the corresponding proportional coefficient of the PI controller connected to respective positive and negative inputs of the unit adders, the outputs of which are connected to the inputs of block multiplication, the other inputs of which are connected to the outputs of the block coefficients of the function switch, the input connected to the output of the parametric coefficients, the outputs of block multiplication is connected to the positive inputs of the adder, the output of which is connected to the relay with high switching frequency, the output of which is connected to the input of the multiplier, the other input of which is connected with the output of the scaling block containing the maximum signal velocity of the shaft of the actuator, the output of the specified block is also connected to the first input of the switch, the output of the multiplier is connected to the second input of the switch, the output of the specified switch is connected to the reference input of a PI-regulator control channel speed frequency Converter that implements vector control that is connected asynchronous motor with squirrel-cage rotor.

This method can be is used in any servo system with asynchronous frequency-adjustable electric drive.

The technical essence of the proposed invention is illustrated in the drawing, where figure 1 shows the structural diagram of the tracking system that implements the optimal precision method of speed control of asynchronous frequency-regulated electric drive with squirrel-cage rotor.

For clarification of the proposed method we use the equations describing when regulatory functions of time and disconnected regulators currents in the respective control channels, the dynamics of asynchronous frequency-adjustable electric drive in the coordinate system oriented along the vector of the rotor flux linkage:

where Rr- the active resistance of the phase winding of the rotor, corresponding to the resistance of the stator winding,

Lrthe inductance of the phase windings of the rotor, corresponding to the inductance of the stator winding,

Kr- coefficient of the rotor of the engine,

Tr- the time constant of the motor rotor,

Tss- the time constant of the motor stator,

p - number of pole pairs

J is the moment of inertia

Lssthe leakage inductance of the stator winding,

Mc- constant moment of resistance,

K1p - proportional coefficient for PI control of the rotor flux linkage,

K1u - integral gain of the PI regulator flux linkage, R is a torus,

T1 is the time constant of the PI controller of the rotor flux linkage,

K2p - proportional gain of the PI speed controller shaft,

K2u - integral gain of the PI speed controller shaft,

T2 is the time constant of the PI speed controller shaft,

ψr_zad - job poolscaping rotor

ω_zad job in the speed of rotation of the shaft,

ψr- magnetic flux linkage of the rotor

isdthe projection of the generalized vector current on the axis d (transformation and the coordinate system of the Park-Gorev),

isqthe projection of the generalized vector current in the q axis (transformation and the coordinate system of the Park-Gorev),

ω is the rotation speed of the shaft drive

usdthe projection of the generalized stress vector on the axis d (transformation and the coordinate system of the Park-Gorev),

usqthe projection of the generalized stress vector on the axis q (transformation and the coordinate system of the Park-Gorev).

From equations (1), it follows that the asynchronous variable frequency drive is an object of regulation with two control actions: ψr_zad and ω_zad.

Using theory of analytical design of controllers RAS, we write the optimal accuracy of the law controlling the speed of rotation of the drive:

where ω_zad_max - maximum is the value of the velocity signal, which may be input to the speed control of the frequency Converter;

isd_zad - sets the exposure for the current isd;

isq_zad - sets the exposure for the current isd;

usd*_zad - setting effect for values of usd+K1p·ψr_zad;

usq*_zad - setting effect for values of usq+K2p·ω_zad.

The reference signals are defined:

Instantaneous values of the variables of the rotating coordinate system dq (isd, isqusdusq) variables are defined through the fixed coordinate system αβ (i, iuu):

Variables fixed coordinate system (i, iuu) are defined through the actual phase currents (ia, ib, ic) and phase voltage (uaubuc):

The values of the cosine and sine of the offset angle coordinate system dq relative to the coordinate system αβ (cosϑ(dq)and sinϑ(dq)are defined:

The weighting coefficients a, b, C, N are defined:

The coefficient is α1, α2, α3, α4, α5, α6, β1, β2, β3, β4, γ1, γ2, γ3, γ4, κ1, κ2, κ3 are expressed through the parameters of frequency-controlled asynchronous electric drive:

The parameters of the PI speed controller shaft set:

T2=2.

From formulas (2)-(12) it follows that this method requires the combination of levels of the respective coordinates (3), the calculation system of weights (4), the calculation system of parametric coefficients (8)-(11), the relay with high switching frequency, system conversion of the instantaneous values of phase currents and voltages (ia, ib, icuaubucin instantaneous values of currents and voltages in the stationary coordinate system αβ (iα, iβuαuβ), systems for converting values of the fixed coordinate system (iα, iβuαuβin the signals of the moving system of coordinates (isd, isqusdusq) dq, system calculate the instantaneous value of the rotor flux linkage (as the reduced speed ratio of the useful signal-to-noise ratio at the output of the sensors of the magnetic flux of the rotor is reduced so that their use becomes impossible)system to calculate the cosine and sine of the offset angle of the rotating coordinate system dq relatively nebody the Noah coordinate system αβ, sensors shaft speed of the motor phase currents, phase voltages, the corresponding settings of the PI speed controller shaft (12), the calculation system of the reference signal on poolscaping rotor (because the control input policestation rotor is not available in most frequency converters with vector control).

The proposed method is implemented in a tracking system with frequency-controlled induction motor with squirrel-cage rotor, implementing vector control through the channels of the shaft rotational speed and the rotor flux linkage, with PI-controller in the control channel speed, where the input of the speed control of the frequency Converter signal by formula (2).

The tracking system (figure 1) contains a frequency Converter that implements vector control 1, asynchronous motor with squirrel-cage rotor 2, and the unit containing the phase current sensor 3, the sensor instantaneous speed signal 4, the sensor phase voltages 5, the Converter of the number of phases current 6, vector analyzer 7, the Converter of the number of phases voltage 8, the rotator current 9, rotator voltage 10, block parametric coefficients 11, the block of coefficients to switch 12, block adders 13, block multiplication 14, an adder 15, a block reference signals 16, the unit works signal the ass is of the rotor flux linkage and the corresponding proportional coefficient of the PI controller 17, work package reference signal speed of rotation of the shaft and a corresponding proportional coefficient for PI-controller 18, the relay with high switching frequency 19, the scaling block containing the maximum signal velocity of the shaft of the actuator 20, the multiplier 21, the switch 22 and the switch 23.

The output phase current sensor 3 is connected to the input transducer of the number of phases current 6, the sensor output phase voltage 5 is connected to the input transducer of the number of phases voltage 8, the output of the inverter of the number of phases current 6, and the output of the sensor's instantaneous speed signal 4 is connected with the input vector analyzer 7, the output of the inverter of the number of phases current 6, and the output vector analyzer 7 is connected to the input of the rotator current 9, the output vector analyzer 7 and the output transducer of the number of phases voltage 8 is connected to the input of the rotator voltage 10, the outputs unit works reference signal of the rotor flux linkage and the corresponding proportional coefficient of the PI controller 17 and the unit works signal of the speed of rotation of the shaft and the corresponding coefficient of the PI controller 18 is connected to the input of the block reference signals 16, the output of the sensor's instantaneous speed signal 4, the output vector analyzer 7, the output of the rotator current 9, the output of the rotator voltage 10, o the d block of the reference signals 16, the output from work package reference signal of the rotor flux linkage and the corresponding proportional coefficient of the PI controller 17 directly and consistently through the switch 23, the output from work package reference signal speed of rotation of the shaft and the corresponding coefficient of the PI controller 18 connected to respective positive and negative inputs of the unit adders 13, the outputs of which are connected to the inputs of block multiplication 14, the other input of which is connected to the outputs of the block of coefficients to switch 12, an input connected to the output of the parametric coefficients 11, the outputs of block multiplication 14 is connected to the positive inputs of the adder 15, the output of which is connected to the input of relay high frequency switch 19, the output of which is connected to the input of the multiplier 21, the other input connected to the output of the scaling unit 20, the output of which is also connected to the input 1-1 switch 22, the output of multiplier 21 is connected to the input of 1-2 switch 22, the output of switch 22 is connected to the reference input of a PI-regulator control channel speed frequency inverter with vector control 1, is connected asynchronous motor with squirrel-cage rotor 2.

The way to manage asynchronous frequency-adjustable electric drive with korotkosheyko the first rotor is implemented in a tracking system, working in the following way. Define the job poolscaping rotor (ψr_zad), which uses data about the steady state value of the rotor flux linkage) experience of start frequency-controlled asynchronous electric drive at the maximum speed (velocity signal is fed from the automatic potentiometer), and when no load torque (the same data that is used by the control system of the frequency Converter with vector control [Manual frequency converters series VECTORFLUX™ VFB and VECTORFLUX™ VFX, document Number: 01-1887-01, document Version: r4. Release date: 2004-03-25, © Copyright Emotron AB 2004]), the resulting output vector analyzer 7 in steady state operation, for which the switch 22 is switched to position 1, and switch 23 is transferred to an on state. After the experiment, the first launch of the steady-state value of the rotor flux linkage is recorded in the block works the reference signal of the rotor flux linkage and the corresponding coefficient of the PI controller 17 as ψr_zad, the switch 22 is switched to position 2, and the switch 23 is switched to the off position, the control input shaft rotation speed of the electric signal from the multiplier 21. With the sensor output shaft speed 4 remove the instantaneous value of the rotational speed of the shaft of the actuator, sensor phase currents 3 remove instantaneous values of phase currents ia, ib, icwith sensor phase voltage 5 remove the instantaneous values of phase voltages uaubuc. The output signal of the sensor 3 phase currents fed to the input transducer of the number of phases current 6 that implements equation (5) for the currents, where the conversion of three-phase current into two-phase. The output signal of the sensor phase voltage 5 is fed to the input transducer of the number of phases voltage 8, which implements equation (5) for voltages, where the conversion of three-phase voltage in two-phase. The received signals of two-phase current (iα, iβ), and the signal instantaneous rotation speed (ω), is fed to the input vector analyzer 7, which implements equation (6). The output vector analyzer 7 are formed signals sine and cosine of the displacement angle of the rotating coordinate system dq relative to the fixed coordinate system αβ (sinϑ(dq), cosϑ(dq)), as well as the instantaneous signal value of the rotor flux linkage (ψr). Signals sinϑ(dq), cosϑ(dq)output vector analyzer 7, and the signals (iα, iβ) inverter output number of phases current 6 and signals (uαuβ) inverter output number of phases voltage 8 arrives at the inputs of the respective mouth is tori 9, 10 implementing equation (4). Obtained at the output of the rotator current 9 value of isd, isqthe signal instantaneous rotation speed (ω) output instantaneous speed signal 4, the signal of the rotor flux linkage (ψr) output a vector analyzer 7 are received at the negative input of unit adders 13, the positive input of which receives the appropriate signals set the level of coordinates forming unit reference signals 16 according to equations (3). Obtained at the output of the rotator voltage 10 signals usdusqsummarized in the block adders 13 works of reference signals and the corresponding proportional coefficients of the PI regulator 17, 18 and the obtained values (usd+K1p·ψr_zad, usq+K2p·ω_zad) served on the negative inputs of the adders 13, the positive input of which receives the appropriate signals set the level of coordinates forming unit reference signals 16 according to equations (3). The resulting difference between the reference signals of the coordinates coming from the block 16, and the coordinates (ψr_zad-ψr, isd_zad-isd, isd_zad-isd, isd_zad-isq, ω_zad-ω, usd_zad*-usd-K1p·ψr_zad, usq_zad-usq-K2p·ω_zad) multiplied by the unit multiplying 14 by respective weighting coefficients generated at the output of the block of coefficients to switch 12 (implements urav the program (7)), at the input 12, the signals from the output of the block parametric coefficients 11 that implements equations (8)-(11). Thus obtained compositions are added 15 and the received signal at the relay 19 with a high switching frequency. The relay 19, the signal is scaled by the maximum value of the level set speed 20 (ω_zad_max), resulting in optimal precision signal controlling the speed of rotation of the shaft by formula (2), which is fed to the input of the speed control of the frequency Converter 1.

The accuracy of modern automatic control systems are usually limited to a system error. The present invention allows to reduce the error in the automatic control systems to zero (theoretically). This increases the efficiency of automatic control systems and extends their functionality.

1. The method of controlling a frequency-controlled induction motor with squirrel-cage rotor, based on the conversion of the amounts of the respective differences of the reference signals of the level coordinate drive coming from the generator rotation speed of the drive and feedback signals on the corresponding coordinates in the reference signal of the rotation speed of the shaft of the actuator, characterized in that the reference signal input to guide the project for a shaft rotation speed of the electric drive is available from the generator, made in the form of a relay controller operating in the sliding mode, which receives the amount of the difference of the reference signals of the level coordinate drive and feedback signals on respective coordinates, multiplied by appropriate weighting factors.

2. The tracking system with frequency-controlled asynchronous electric drive with squirrel-cage rotor with vector control with PI controller in the speed control shaft of the electric drive and the unit of signal speed of rotation of the drive shaft, characterized in that the signal generator rotation speed of the drive is made in the form of a relay controller that contains the phase current sensor, the sensor instantaneous speed signal, the sensor phase voltages, the Converter of the number of phases current, vector analyzer, Converter number of phases voltage, rotor current, rotor voltage, the unit of parametric coefficients, a block of coefficients switch function block adders, multiplication unit the adder block of the reference signals, the unit works reference signal of the rotor flux linkage and the corresponding proportional coefficient of the PI controller, the unit works signal of the speed of rotation of the shaft of the actuator and the corresponding proportional coefficients is a PI-regulator, relay with high switching frequency, the scaling block containing the maximum signal velocity of rotation of the shaft drive, the multiplier, the switch and the switch, and the sensor output phase currents connected to the input transducer of the number of phases current, the sensor output phase voltage connected to the input transducer of the number of phases voltage, the output of the inverter of the number of phases current, and the output of the sensor's instantaneous speed signal is connected to the input vector analyzer, the output of the inverter of the number of phases current, and the output vector analyzer connected to the input of the rotator current, the output vector analyzer and the output with the Converter of the number of phases voltage connected to the input of the rotator voltage, the outputs of work package reference signal of the rotor flux linkage and the corresponding proportional coefficient of the PI controller and the unit works signal of the speed of rotation of the shaft of the actuator and the corresponding proportional coefficient of the PI controller connected to respective positive and negative inputs of the unit adders, the outputs of which are connected to the inputs of block multiplication, the other inputs of which are connected to the outputs of the block coefficients of the function switch, the input connected to the output of the parametric coefficient is in, the outputs of block multiplication is connected to the positive inputs of the adder, the output of which is connected to the relay with high switching frequency, the output of which is connected to the input of the multiplier, another input connected to the output of the scaling block containing the maximum signal velocity of the shaft of the actuator, the output of the specified block is also connected to the first input of the switch, the output of the multiplier is connected to the second input of the switch, the output of the specified switch is connected to the reference input of a PI-regulator control channel speed frequency Converter that implements vector control that is connected asynchronous motor with squirrel-cage rotor.



 

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Electric motor // 2454774

FIELD: electricity.

SUBSTANCE: electric motor (1) consists of the first structure (4) that includes some magnetic poles formed by a certain sum of magnetic poles (4a) organised in certain direction and arranged in such a way that every two neighbouring magnetic poles (4a) have polarity that differ from one another, the second structure (3) that includes some armatures located opposite to the said magnetic poles for generating movable magnetic fields moving in certain direction between the row of armature and row of magnetic poles under the influence of certain sum of armature magnetic poles generated in the armatures (3c - 3e) at electric power supply to them, and the third structure (5) that includes a row of elements from magnetic-soft material formed by certain sum of elements (5a) from magnetic-soft material organised in certain direction with a one gap in relation to the other and arranged in such a way that a row of elements from magnetic-soft material is located between a row of magnetic poles and a row of armatures, number of magnetic poles (4a) and number of elements (5a) from magnetic-soft material is determined by the ratio 1 : m : (1 + m)/2 (m ≠ 1.0).

EFFECT: decrease of dimensions and manufacturing cost of the said electric motor with simultaneous provision of possibility to increase freedom degree at its designing.

6 cl, 19 dwg

FIELD: electricity.

SUBSTANCE: torque control method is as follows: during control of the AC converter-field motor torque by way of pulse-width modulation methods with generation a control signal from the error signal sum (calculated as the difference between the measured and the required values of the phase current winding) and the sawtooth sweep signal (dropping to zero and equal to the estimated value of the error signal at the key elements commutation moment) the error signal value is not in excess of the pulsing component of the phase winding current resultant from pulse-width modulation.

EFFECT: dead zone reduction and increased accuracy of the AC converter-field motor torque control within a wide range of rotation frequencies.

5 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: transformer-contactless synchronous motor assembly contains a transformer (2) with a secondary winding having lower voltage (3) and upper voltage (4) three-phase outputs, a synchronous motor with a main (5) and an additional (6) three-phase windings on the stator. The main winding (5) is Y-connected and joined to the lower voltage outputs (3). The additional winding (6) beginning and end are respectively connected to the upper voltage outputs (4) (via the circuit breaker (7)) and to the motor excitation system. The motor contactless excitation system has an asynchronous exciter with two three-phase windings, (8) and (9), on the stator. The winding (8) is connected to the motor additional winding (6) ends. The winding (9) beginnings are connected to those of the additional winding (6) while the ends are connected to the main winding (5) beginning via a commutation apparatus (11) and a three-phase choke (12). Positioned on the common rotating rotor of the motor and the exciter are the asynchronous exciter multi-phase winding (1), a rectifier (14) and the synchronous motor excitation winding (13), all connected in series. The excitation winding (13) is connected to the rectifier (14) rectified current side.

EFFECT: reduction of power loss in the low load mode.

1 dwg

FIELD: electricity.

SUBSTANCE: according to the method for control of AC electric drive during generation of the inverter thyristors control signals one uses relay motor phase voltage regulators, sinusoidal signals for the motor phases voltage setting supplied to the first inputs of the relay regulators of the corresponding motor phases voltage. Supplied to the second outputs of the relay motor voltage regulators are measured instantaneous values of the corresponding motor phases voltage, the control logical signals from the outputs of the relay motor phase voltage regulators supplied to the control outputs of thyristors of the corresponding inverter anode group phases as well as to the inputs of the logical NOT elements of the corresponding phases. Control logical signals from the logical NOT elements outputs supplied to the control inputs of thyristors of the corresponding inverter cathode group phases.

EFFECT: simplification of the system for control of the AC electric drive based on a standalone current inverter with fully controlled power switches.

3 dwg

FIELD: electricity.

SUBSTANCE: according to the method for control of AC electric drive during generation of the inverter thyristors control signals one uses relay motor phase voltage regulators, sinusoidal signals for the motor phases voltage setting supplied to the first inputs of the relay regulators of the corresponding motor phases voltage. Supplied to the second outputs of the relay motor voltage regulators are measured instantaneous values of the corresponding motor phases voltage, the control logical signals from the outputs of the relay motor phase voltage regulators supplied to the control outputs of thyristors of the corresponding inverter anode group phases as well as to the inputs of the logical NOT elements of the corresponding phases. Control logical signals from the logical NOT elements outputs supplied to the control inputs of thyristors of the corresponding inverter cathode group phases.

EFFECT: simplification of the system for control of the AC electric drive based on a standalone current inverter with fully controlled power switches.

3 dwg

FIELD: electricity.

SUBSTANCE: according to the method for control of AC electric drive during generation of the inverter thyristors control signals one uses relay motor phase voltage regulators, sinusoidal signals for the motor phases voltage setting supplied to the first inputs of the relay regulators of the corresponding motor phases voltage. Supplied to the second outputs of the relay motor voltage regulators are measured instantaneous values of the corresponding motor phases voltage, the control logical signals from the outputs of the relay motor phase voltage regulators supplied to the control outputs of thyristors of the corresponding inverter anode group phases as well as to the inputs of the logical NOT elements of the corresponding phases. Control logical signals from the logical NOT elements outputs supplied to the control inputs of thyristors of the corresponding inverter cathode group phases.

EFFECT: simplification of the system for control of the AC electric drive based on a standalone current inverter with fully controlled power switches.

3 dwg

FIELD: electricity.

SUBSTANCE: control and/or adjustment device for control of operation of an asynchronous machine (K) with power supplied from a three-phase electric energy converter (G) contains a control and/or adjustment structure including the stator flow controller (R) and a pulse sequence generator (P) for generation of pulse signals based on average values; the stator flow controller (R) output is connected to the pulse sequence generator (P) input so that the pulse sequence generator (P) generates pulse signals depending on the control action produced by the stator flow controller (R); the stator flow controller (R) is designed so that to produce such control action depending on the set value of the asynchronous machine (K) stator flow and on the set value of the asynchronous machine (K) torque; the stator flow controller (R) has an aperiodic adjustment characteristics.

EFFECT: technical and economic performance improvement.

23 cl, 15 dwg

FIELD: electricity.

SUBSTANCE: in the method for control of an AC electronic motor three-phase power-supply voltage is generated of the sign of difference between the signal of the three-phase sensor of the synchronous motor rotor position and the signal of the synchronous motor current three-phase sensor. The control signal is generated by way of subtracting the speed feedback signal and the angle feedback signal from the from the angle assignment signal. The tracking system with an AC electronic motor comprises a modulator, a three-phase sensor of the synchronous motor rotor position, a three-phase demodulator, a three-phase summator, a three-phase relay, a three-phase converter, a three-phase synchronous motor current sensor, a three-phase synchronous motor; additionally introduced are a reducer with an angle sensor and the synchronous motor speed sensor, a summator with one summation input and two countdown inputs output connected to the tracking system elements as per the invention formula.

EFFECT: provision of characteristics identical to those of a DC collector motor by means of analytical design of the AC electronic motor shaft turn controller, optimal in terms of accuracy.

2 cl, 1 dwg

FIELD: electricity.

SUBSTANCE: in three-phase current motor the control of rotor speed is achieved only by combination of supply current phase windings located on two pairs of stator poles so that three-phase motor is changed into two-phase motor, with shift through 90 electric degrees between magnetic fluxes of pairs of poles, the control of rotation speed of which is performed by changing the voltage value on windings of one of the pole pairs.

EFFECT: smooth mechanical regulation of processes in wide range.

4 dwg

FIELD: electricity.

SUBSTANCE: change of rotation speed of asynchronous motor armature consists in change of frequency and voltage supplied to stator windings; at that, voltage on stator is controlled proportionally to frequency. Device includes two pulse generators, alternating voltage rectifier, voltage comparator, voltage integrator, pulse-width modulator and in-series connected binary pulse counter, permanent storage unit, pulse shaper and voltage switching unit intended to connect working voltage to electric motor circuit.

EFFECT: improving the control quality of asynchronous motor rotation speed by providing smooth rise or drop of electric motor armature rotation frequency during acceleration or braking.

3 dwg

Electric motor // 2454774

FIELD: electricity.

SUBSTANCE: electric motor (1) consists of the first structure (4) that includes some magnetic poles formed by a certain sum of magnetic poles (4a) organised in certain direction and arranged in such a way that every two neighbouring magnetic poles (4a) have polarity that differ from one another, the second structure (3) that includes some armatures located opposite to the said magnetic poles for generating movable magnetic fields moving in certain direction between the row of armature and row of magnetic poles under the influence of certain sum of armature magnetic poles generated in the armatures (3c - 3e) at electric power supply to them, and the third structure (5) that includes a row of elements from magnetic-soft material formed by certain sum of elements (5a) from magnetic-soft material organised in certain direction with a one gap in relation to the other and arranged in such a way that a row of elements from magnetic-soft material is located between a row of magnetic poles and a row of armatures, number of magnetic poles (4a) and number of elements (5a) from magnetic-soft material is determined by the ratio 1 : m : (1 + m)/2 (m ≠ 1.0).

EFFECT: decrease of dimensions and manufacturing cost of the said electric motor with simultaneous provision of possibility to increase freedom degree at its designing.

6 cl, 19 dwg

Electric motor // 2454774

FIELD: electricity.

SUBSTANCE: electric motor (1) consists of the first structure (4) that includes some magnetic poles formed by a certain sum of magnetic poles (4a) organised in certain direction and arranged in such a way that every two neighbouring magnetic poles (4a) have polarity that differ from one another, the second structure (3) that includes some armatures located opposite to the said magnetic poles for generating movable magnetic fields moving in certain direction between the row of armature and row of magnetic poles under the influence of certain sum of armature magnetic poles generated in the armatures (3c - 3e) at electric power supply to them, and the third structure (5) that includes a row of elements from magnetic-soft material formed by certain sum of elements (5a) from magnetic-soft material organised in certain direction with a one gap in relation to the other and arranged in such a way that a row of elements from magnetic-soft material is located between a row of magnetic poles and a row of armatures, number of magnetic poles (4a) and number of elements (5a) from magnetic-soft material is determined by the ratio 1 : m : (1 + m)/2 (m ≠ 1.0).

EFFECT: decrease of dimensions and manufacturing cost of the said electric motor with simultaneous provision of possibility to increase freedom degree at its designing.

6 cl, 19 dwg

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