Frequency electric drive |
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IPC classes for russian patent Frequency electric drive (RU 2539293):
 Asynchronous motor with excluded idling / 2538405
To device consisting of three-phase cage asynchronous motor, thyristor regulator for the purpose of reduced power consumption at idling by means of automatic transfer of the device to pulse mode in circuit of each stator phase downstream thyristors there are three in-series inductance coils and additional three capacitors coupled in parallel to stator windings of the caged asynchronous motor.
 Electric drive of stand-alone object with ac converter-fed motor / 2537957
Invention relates to electric engineering and may be used in ac converter-fed electric drive of stand-alone objects. The electric drive of stand-alone object with AC current-fed motor includes the rotor position transmitter, stand-alone voltage inverter, speed regulator, trigonometric converters. Current regulator outputs as projected to axis q and current regulator as projected to axis d are connected to the calculator, and calculator output is connected to the control input of the stand-alone voltage inverter that is connected with windings of the AC current-fed device via current feedback, speed feedback and flow feedback as projected to axis d.
 Inverter installation and method for inverter installation control method / 2533167
Inverter installation includes basically an inverter (3), a component (12, 26, 27) for rotation rate detection and a control component (9). The inverter (3) comprises plurality of pairs of switching elements (Q1-Q6). The control component (9) controls on-off state of the switching elements (Q1-Q6) to convert direct current from the direct-current power source (1) to alternating current performing the first and second controls in sequence when rotation rate of the engine (4) coupled to the switching elements is more than the specified rotation rate. The first control switches on the switching elements (Q1, Q3, Q5), which are connected directly to the positive electrode of the power supply source and switches off the switching elements (Q2, Q4, Q6), which are connected directly to the negative electrode of the power supply source. The second control switches on the switching elements (Q2, Q4, Q6), which are connected directly to the negative electrode and switches off the switching elements (Q1, Q3, Q5), which are connected directly to the positive electrode.
 Method and device of digital processing of signals from pulse sensor of rotor movement in electric motor-encoder / 2532673
Group of inventions relates to the method and device of digital processing of signals from a pulse sensor of rotor movement in an electric motor-encoder, which may be used in an electric drive, in particular, a thrust electric drive of vehicles of different type and purpose. To process information about angular position of the rotor, an observer is used to observe mechanical variables of electric drive condition and a predictor, for functioning of which they previously before start of electric drive operation they set initial values of angular position of the electric motor rotor equal to zero, as well as values of angular speed of rotor rotation and load moment on the electric motor shaft, and an initial correcting signal of the predictor. During each cycle of calculations they produce a measured value of the angular position of the rotor, calculate the preliminary value of the correcting signal of the predictor. Further they produce the value of the correcting signal of the predictor and determine the value of the angular position of the rotor predicted for the start of the next cycle of calculations.
 Method and device for electric motor start-up / 2532532
Invention is attributed to the field of electric engineering and may be used for electric motor start-up. Start-up method for the electric motor (100) with a rotor includes the following stages: rotor rotation in the first direction by means of the first torque, at that maximum value of the first torque does not exceed maximum value of torque counteracting the rotor rotation so that the rotor is braked in the first idle position; rotation of the rotor in the first idle position in the second direction opposite the first one until the rotor is braked in the present second idle position and start-up of rotation for the rotor in the second idle position in the first direction of rotation.
 Electromagnetic torque control device for alternating-current two-phase motor / 2532528
Invention is related to the area of electric engineering and may be used for electromagnetic torque control of alternating-current two-phase squirrel-cage induction motor. Excitation winding of the squirrel-cage motor is coupled to the alternating-current power supply in series connected through a compensating load unit, which, in its turn is connected in parallel with a switching unit. Input of the switching unit is coupled to output of the amplification coefficient control device, which is coupled to the first input of the amplifier with controlled amplification coefficient. Input of the amplification coefficient control device and the second input of the amplifier with controlled amplification coefficient are coupled to the voltage control source and output of the amplifier with controlled amplification coefficient is coupled to input of the power amplifier, which is connected in parallel to the control winding.
 Electric drive / 2531380
Invention relates to electrical engineering and can be used in electric drive for mine winders. The device comprises a wound rotor induction motor, the main contactor with normally opened contacts and normally closed block contact, a dynamic braking contactor with normally opened contacts, an accelerating resistor, a semi-controlled three-phase rectifier and thyristors with current-limiting resistors, a resistor in excitation circuit, shunt, a thyristor switch, stabilitron and optron.
 Direct converter and system with this type of converter / 2531358
Invention is related to the area of electric engineering and may be used to convert alternating voltage or current to alternating voltage or current without intermediate conversion to direct voltage or current. Technical result lies in provision of arbitrary and continuous control of current passage from input phase leads to output phase leads of the direct converter. The direct converter (1) is equipped with n input phase leads (U1, V1, W1) and p output phase leads (U2, V2, W2), where n≥2 and p≥2, n·p double-pole switching elements (2) for connecting of at least one positive and at least one negative voltage between poles. Each output phase lead (U2, V2, W2) is connected in series with each input phase lead (U1, V1, W1) through one switching element (2).
 System and method for dynamic control of active power at load / 2528621
Invention relates to electrical engineering and can be used in AC drives. The system and method for AC motor drive control comprises a control system with programmed energy saving algorithm in which the operation of the electric motor drive is optimised. The control system provides the drive with an initial command "voltage-frequency" on the basis of the initial characteristic voltage/frequency (V/Hz), in real time it receives the drive's output data generated in accordance with the initial command "voltage-frequency" and sends back a variety of changed commands "voltage-frequency". Each command out of the variety of changed commands "voltage-frequency" contains a deviation from the initial characteristic "V/Hz". In real time the control system also defines the value of electric motor parameter corresponding to each command of the said variety of changed commands "voltage-frequency" and sends a changed command "voltage-frequency" back to the AC electric motor drive so that the indicated value of the electric motor parameter defined on a real time basis falls within the range of permissible values for the electric motor parameter.
 Alternating current electric drive / 2528612
Invention is related to electric engineering, in particular, to variable alternating current electric drives. An AC electric drive comprising an induction motor with a phase rotor and an inverter with PWM current controller, two stator current sensors, a speed sensor set on the motor's shaft, a calculating unit for the setup of the motor torque, a calculating unit for the setup of stator current, a setup unit for stator phase currents, a setup unit for stator field rotation speed, is equipped by a correction unit for the motor torque setup including additional rotor current sensors and a unit for calculation operations which generates a correction signal for the motor torque setup in the function of the parameter defined in simpler way - tangent of angle between the vectors of stator currents and of magnetising current calculated on the basis of the measured phase currents of the motor stator and rotor. Inverter generates stator phase currents with amplitude and frequency required to generate the specified torque value provided that stator current consumption from the network is minimised. The electric drive is fitted by the correction system with actual measured variables thus simplifying the algorithm for correction signal calculation and bating requirements to the process controller.
Asynchronous motor with excluded idling / 2538405
To device consisting of three-phase cage asynchronous motor, thyristor regulator for the purpose of reduced power consumption at idling by means of automatic transfer of the device to pulse mode in circuit of each stator phase downstream thyristors there are three in-series inductance coils and additional three capacitors coupled in parallel to stator windings of the caged asynchronous motor.
 Electrical machine / 2458446
In a proposed design of an electric machine comprising a stator and a rotor arranged outside the stator, bearing supports perceiving vertical and horizontal loads, and an electromagnet reducing the load at bearing supports. At the same time, according to this invention, the specified electromagnet is placed inside the stator.
 Asynchronous controlled machine / 2380813
In proposed asynchronous controlled machine, apart from the main magnetic conductors of rotor and stator, the first additional magnetic conductor of stator and rotor are installed from separate ring packets with AC windings, and also the second additional magnetic conductor of rotor with induction winding. Opposite cylindrical sides of packets are closed with magnetic conductor. Toroidal AC windings are placed between adjacent ring packets of magnetic conductors. Rotor windings of the main and first additional magnetic conductors are connected to each other, and winding of the main magnetic conductor stator is equipped with unit of frequency converter and is connected to stator winding of the second additional magnetic conductor. Besides input terminals are installed on toroidal windings of the first additional magnetic conductor stator.
 Asynchronous electric machine / 2359391
Present invention relates to electrical engineering and electric machine building, particularly to controlled alternating current electric machines. On the stator and rotor of the asynchronous electric machine there are extra magnetic conductors, made from separate circular packets with alternating current toroid windings between adjacent packets, matching up on the stator bore of the magnetic conductor through a circular air gap. Input terminals are fitted on the toroid windings of the stator. Opposite cylindrical sides of the packets of magnetic conductors are provided with extra closing magnetic conductors. The stator winding of the main magnetic conductor is provided with a block of controlled resistors and controlled direct current source. Between the units of the stator and rotor of the extra magnetic conductor, there is no torque and rotational emf. The frequency of rotation of the rotor has no effect on the electromagnetic field in the circular air gap. Therefore, exchange of electrical energy between windings of the stator and rotor of the extra magnetic conductor takes place through transformer coupling. The torque of the electric machine in the given range of frequency of rotation is controlled by varying resistance of the stator circuit. The machine switches into synchronous mode of operation by supplying direct current to the stator winding of the main magnetic conductor when subsynchronous frequency of rotation is attained.
 Submersible electric motor / 2255408
Proposed submersible electric motor has barrel-shaped stator incorporating press-fitted magnetic core, extended three-phase winding, head, rotor disposed inside stator barrel, shaft passed through head, thrust bearing assembly, and current lead-in assembly connected to stator winding. Head is provided with duct to receive case of telemetering unit incorporating pressure, temperature, and vibration transducers, processor, power amplifier, dc voltage supply, and interface. Pressure transducer has series-connected strain sensor, pressure-transducer voltage amplifier, and pressure-transducer analog-to-digital converter. Temperature transducer has series-connected temperature-transducer sensing element, temperature-transducer voltage amplifier, and temperature-transducer analog-to-digital converter. Interface output is connected to input of dc voltage supply whose first output is connected to power amplifier, second one, to pressure strain sensor, and third output, to voltage amplifiers and analog-to-digital converters of pressure and temperature transducers, temperature-transducer sensing element, vibration transducer, and processor that affords analysis of information arriving from above-mentioned transducers, computation, coding, and data transfer to control station. Power amplifier output is connected to control device input. Analog-to-digital converter of pressure transducer is built in processor. Analog-to-digital converter of temperature transducer is connected to processor. Two outputs of vibration transducer are connected to two inputs of processor whose output is connected through power amplifier to interface input; interface output is connected to current lead-in assembly.
 Asynchronous sealed squirrel-cage motor and method of manufacturing / 2231895
The invention relates to the field of electrical engineering, namely to asynchronous motors
 Asynchronous motor, combined with the electronic generator / 2169982
The invention relates to the traction electric vehicles
 Electric drive adjustable / 2136101
The invention relates to the field of engineering and is intended for the production of electric drives high reliability and high efficiency
 Asynchronous motor with stepless speed / 2130226
The invention relates to the field of electrical engineering, in particular to the field of elektrodvigateley, and may find application in electric drives birotational type (actuator double rotation)
 Terminal asynchronous electrical machine / 2522898
Proposed electric machine is characterised by forming winding of each stator out of concentric coils laid in one layer on the circle periphery of toroidal magnetic conductor in the A, C, B order. Rotor of split thickness consists of at least two discs separated by air gap and featuring slots for installation of common ferromagnetic inserts. Stators are positioned so that same phase coils of opposing stators are placed at three hundred sixty electrical degrees against each other.
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FIELD: electricity. SUBSTANCE: frequency electric drive contains a three-phase electric motor the windings of which are connected in triangle and are connected to a voltage inverter. Poles of the inverter are connected to poles of the rectifier and filter designed as two series connected capacitors. The electric motor is fitted with leads from the middle of windings to which the terminals of the star connected three-phase capacitor battery are connected the zero point of which is connected to the middle point of series connected filter capacitors. EFFECT: improved reliability. 1 dwg
The invention relates to electrical engineering and can be used in the drive. Widely known actuator [1] contains a three-phase Converter (thyristor), whose input is designed for connection to the network, and the output is connected to the motor, the zero point of the windings of the stator of which is connected to the ground wire of the network. The use of such connection in a frequency drive increases losses and heating of the motor, especially if the frequency Converter. The closest structure is [2] three-phase asynchronous electric drive containing the three-phase motor, the windings of which are connected by a triangle and three-phase capacitor battery. Deficiency results in partial failure, for example, when the phase windings of the motor. In this case, the engine loses efficiency. The technical result of the proposals is to improve the reliability. The claimed result is due to the fact that the engine is supplied by branches from the middle of the windings, which are attached to the conclusions of the three-phase capacitor Bank connected star, the zero point of which is connected to the middle point of the series-connected filter capacitors. The drawing shows a diagram of frequency of the drive. Three windings 1, 2, 3 motor connection is by the triangle. Winding 1, 2, 3 are supplied by branches from the middle and attached to the capacitors 4, 5, 6, which are connected by a star. Ends and beginnings of the windings 1, 2, 3 is connected to the inverter 7, which poles are attached to the rectifier 8 and the filter, consisting of two series-connected capacitors 9, 10 and shunting resistors 11, 12. Network switch 13 is connected to the input of the rectifier 8. The drive works as follows. When the switch 13 AC mains voltage rectifier 8 is converted to DC and filtered (smoothed) capacitors 9, 10. The capacitors 9 and 10 form a capacitor filter. The resistors 11 and 12 connected in parallel contribute an equal division of voltage (vertically) between the capacitors 9 and 10, and also provide a capacitor discharge when disconnecting the actuator from the mains switch 13. The inverter 8 voltage in a known manner converts DC voltage to AC of the desired frequency and magnitude. Under the action of the last engine rotates. In normal mode introduced a new connection on the engine has virtually no effect, if not to take into account partial compensation of reactive power. In emergency mode, for example when the breakage of the motor windings, and according to statistics it is up to 30% of all failures of engines, introduced new communication informs DV is the engine new properties. Thanks to her, in the phase of the engine, where there is a breakage of the winding, current flows in the floor of the winding. This engine is slightly loses in power - not more than 20% of the nominal, as the work is not involved, only half of the winding, i.e. 1/6 of the windings. Usually the engines are chosen with some reserve. For example, actuator valves must ensure operation when line voltage drops to 80%, when the engine power is reduced to 64% (in proportion to the square of the voltage). Thus, the proposed scheme ensures reliable operation of the electric motor, which is important for responsible actuators, such as fire pumps, fans, valves, etc., Sources of information: 1. Shubenko C. A., Braslavsky, I. J. Thyristor asynchronous electric drive with phase control. M., "Energy", 1972, page 10, Fig.1-3. 2. RF patent №2067352. Frequency drive containing the three-phase motor, the windings of which are connected by a triangle and connected to the inverter voltage pole of the inverter is connected with the poles of the rectifier and filter, made in the form of two series-connected capacitors, characterized in that the engine is supplied by branches from the middle of the windings, which are attached to the conclusions of the three-phase capacitor Bank connected star, the zero point of which is connected with the middle is th point of series-connected filter capacitors.
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