SU1111234A1 - Rotor position transducer for drive with double feed electric machine - Google Patents

Abstract

1. ROTOR POSITION SENSOR FOR DRIVE WITH DOUBLE POWER SUPPLY MACHINE, containing an electromechanical phase shifter, the power supply circuit of which is connected to the output of an uncontrolled high frequency generator, and the output is connected to the input of a phase-sensitive rectifier that is different in order to simplify and increase accuracy, additionally a controlled frequency generator, two adders and a phase meter of the stator current vector are added, the output of the controlled frequency generator is connected to the input of the phase-sensitive rectifier and the first adder, with the second input of which is connected to the output of the uncontrolled frequency generator, the output of the first adder is connected to the input of the second adder, the second input of which is connected to the output of the stator current vector phase meter-jg current and the output of the second adder frequency generator. I

Description

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2. The sensor of clause I, which is distinguished by the fact that a phase-shifting device is switched on between the output of the controlled frequency generator and the input of phase-sensitive rectifiers Miguel.

3. The sensor on p / p. 1 and 2, which is connected with the fact that a multiplication device is connected between the output of the phase-sensitive rectifier and the output of the sensor, the second input of which is connected to the output amplitude setting unit.

The invention relates to electrical engineering and can be used in a controlled electric drive, in particular, with a dual-feed machine.

. A rotor position sensor for a dual-feed motor is known based on an electromechanical transducer, the current in the windings of which is used to control the CIJ frequency converter.

A disadvantage of the known sensor is the impossibility of adjusting the amplitude and phase of the output signal.

Closest to the invention is a rotor position sensor for a dual power machine, comprising an electromechanical phase shifter, the power supply circuit of which is connected to the output of an unmanaged generator, and the output is connected to a phase-sensitive rectifier that is connected to the control input of frequency converter C2.

The disadvantage of such a sensor is the need to use a differential coupled to the shaft of a synchronous motor to bring s to match the phase of the sensor output signal with the phase of the mains supply. The presence of a differential and a synchronous drive motor complicates the drive, and the existence of an internal swing angle of a synchronous motor deteriorates the accuracy of maintaining the specified angle between the stator and rotor current vectors in the dynamics.

The purpose of the invention is to simplify and increase the accuracy of the drive.

This goal is achieved by the fact that the rotor position sensor, the containing electromechanical phase shifter, whose power supply circuit is connected to the output of an unmanaged low frequency generator, and connected to the input of a phase-sensitive rectifier, has additionally controlled a frequency generator, two the adder and phase meter of the stator current vector, and the output of the controlled frequency generator is connected to the input of the phase-sensitive rectifier and the input of the first adder, the second of which is connected to the output Aulus emogo frequency generator of the first adder output is connected to an input of the second adder, a second input coupled to an output of the meter phase stator current vector, and output of the second adder is connected to an input of a controlled oscillator.

To control the phase of the rotor current vector relative to the stator current vector, the phase shifter is connected between the output of the controlled frequency generator and the phase-sensitive rectifier input, and the multiplier device whose second input is connected to control the amplitude of the vector current of the rotary current. with an amplitude sensor output signal. : The drawing shows a structural

scheme of the proposed sensor.

The electromechanical phase shifter 1, powered by an uncontrolled generator of 2 frequencies, is rigidly articulated with the shaft of the electric machine 3. The stator windings of the mask 3 are connected to the mains,: through the sensor 4 phases of the stator current vector, and the rotor to the converter 5 frequencies. Logout31

The phase-turn signal 1 is fed to the first input of the phase-sensitive rectifier 6, the second input of which is connected to the output of the phase-shifter 7. The output signal of the phase-sensitive rectifier 6 through the multiplication device 8 is fed to the input of the frequency converter 5. The input of the phase-shifting device 7 is connected to the output of the controlled frequency generator 9 and the input of the first adder 10, the second input of which is connected to the output of the uncontrolled. generator 2 frequency. The input of the controlled frequency generator 9 is connected to the output of the second adder 11, one input of which is connected to the output of the sensor 4 of the stator current vector phase, and the other to the output of the adder.

The drive works as follows

If the phase shifter 1 is powered by a frequency (Ld, and its shaft rotates with frequency (a), the TO signal at its output is described by the dependence

UcpR 6а)) Н, (1) where is the amplitude value of the output signal of the phase shifter.

The output signal of a phase-sensitive rectifier 6 when a signal (1) is applied to its inputs and a signal with a frequency uOi is determined by the dependence

  JcpUn, SM (bychoing), (2) where K (p is the transfer coefficient of the phase-sensitive rectifier

To control the phase of the output signal of the phase-sensitive rectifier 6, a phase-shifter 7 is turned on at its input. If the phase shift introduced by it is not zero, then the expression (2) takes the form

qpue, q m-s1v tKruDi Ce) e) tbJ. (3)

where (b is the phase shift introduced by the phase-shifting device.

The frequency reference signal H1 is the output signal of the controlled oscillator 9 frequency.

The mode of operation of the dual-feed machine depends on the amplitudes and the relative position of the current vectors in the stator and rotor windings. In order to maintain the drive's specified operating mode, it is necessary to determine the direction of the stator current vector and, with respect to controlling the phase of the rotor current vector. 71p, this would rotate synchronously with the stator vector regardless of the rotation frequency of the motor shaft.

go current. With a network frequency equal to ft). for this, in accordance with expression (3), it is necessary to support (aJj, so that

((u), c-b (4) This dependence can be implemented as follows.

 The signals of the generators 2 and 9 in the adder 10 are compared in phase, and the phase of the error signal is compared in the adder 11 with the phase of the current in the stator motor winding. The mismatch signal of the adder 11 controls the phase of the output signal of the controlled frequency generator in such a way that the magnitude of this error is reduced. By choosing the transmission coefficient of the controlled frequency generator, you can achieve any predetermined mismatch between the phase difference of the motor stator winding current and the phase of the power difference signal of the phase shifter and the output signal of the controlled frequency generator. The dependence (4) in the general case is

() 4t - fo) c .. (5) where / vctit is the deviation of the phase from the given value, due to the -statism of the system.

If the controller at the input of the controlled frequency regulator is astatic, Iro Ao; t is zero and expression (5) corresponds to expression (4).

 As a result of these transformations, the output signal of the phase-sensitive rectifier has the form

opuu cpU, n-9iVvRui) e "i) a), (6)

From expression (6) it follows that the rotor current vector rotates relative to the rotor with a frequency of &) ". + D). The frequency of rotation of the rotor is compensated by the frequency of rotation of the rotor current vector (c) and the angle between the resulting rotor and stator current vectors is determined by the angle setting signal 1b at the input of the phase shifter 7.

In order to control the amplitude of the rotor current vector, between the output signal of the phase-sensitive rectifier 6 and the input of the converter 5, the multiplier 8 is turned on. As a result, the reference signal at the input of the converter is

and Kcj.) r.l: (ai (fl), (7) where Kj is the transmission coefficient of the multiplication device;

51111234. 6

N. -.

ЦЦ - signal of setting the amplitude of the rotor current relative to the rotor current vector. stator current, and excluding the differential use of the device will allow reducing weight, dimensions and reducing k to zero on the distance specified, S cost of the drive with increasing and true value of the phase of its reliability vector.

Renal and synchronous motor

Claims (3)

1. ROTOR POSITION SENSOR FOR A DRIVE WITH A DUAL POWER SUPPLY MACHINE, comprising an electromechanical phase shifter, the power supply circuit of which is connected to the uncontrolled output, connected to the input of a phase-sensitive rectifier, characterized in that, in order to simplify and improve accuracy, a controlled frequency generator is additionally introduced , two adders and a phase meter of the stator current vector, and the output of the controlled frequency generator is connected to the input of the phase-sensitive rectifier and the input of the first adder, with the second input to the output of the uncontrolled frequency generator is connected, the output of the first adder is connected to the input of the second adder, the second input of which is connected to the output of the phase meter of the stator current vector, and the output of the second adder is connected to the input of the controlled NOR 234 2. The sensor according to claim 1, which is about ~ liable. I mean that, between the output of the controlled frequency generator and the input of the phase-sensitive rectifier, a phase-shifting device is turned on. 3. The sensor according to claim 1 and 2, which consists in the fact that between the output of the phase-sensitive rectifier and the output of the sensor is connected a multiplication device, the second input of which is connected to the setpoint for the amplitude of the output signal.