SU1543528A1 - Method of controlling hysteresis electric motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control hysteresis electric motors in the composition of both single-engine and multi-motor electric drives. The aim of the invention is to improve and stabilize energy performance. In the method of controlling a hysteresis electric motor, by determining the degree of excitation of the electric motor before supplying the magnetizing pulse and after its influence and reducing the supply voltage of the electric motor, the limiting energy performance of the electric motors is proportional to the increase in the degree of excitation. 1 hp ff, 1 ill.

Description

The invention relates to electrical engineering and can be used to control single hysteresis motors as well as hysteresis motors grouped together.

The purpose of the invention is the improvement of energy performance and stabilization of energy performance.

The drawing shows a functional diagram of an apparatus for implementing a method for controlling a hysteresis motor.

The device comprises a power source 1 with a voltage regulator 2, a pulsed magnetization unit 3 with a control system 4 consisting

from the formers 5-7 of the duration, phase and frequency of the following magnetizing pulses and the setting device 8 parameters of the pulses, the sensor 9 of the motor supply voltage, the sensor 10 EMF of the electric motor, four blocks 11-14 divisions, three storage elements 15-17, the element 18 comparison and block 19 controls

The two outputs of the power supply source 1 directly, and the third output, through the pulsed magnetization unit 3, is connected to the leads of the stator winding of the hysteresis motor 20. The control input of the pulsed magnetization unit 3 is connected to the output of the system

SL GS

00

By the output of the magnetizing pulse shaper 5, the platoons of which are connected to the outputs of the magnetizing pulse phase 6 and the third and fourth division blocks 13 and 14, respectively, of the magnetizing pulse phase generator 6 are connected to the first and second outputs of the sensor 3 8 parameters of pulses, the input of the fourth division block 14 and the input of the pulse frequency generator 7. The synchronization input of the phase former of the magnetizing pulse forms the synchronization input of the control system 4. The output of sensor 9 of the supply voltage of the electric motor is connected to the information input of the first storage element 1J and the first information inputs of the first and fourth blocks 11 and 14 of the division, the second information inputs of which are connected respectively to the sensor code 10 of the EMF and the output of the storage element 15 The output of the first dividing unit 11 is connected to the information input of the second memory element 16, the first input of the comparison unit 18 and the first information inputs of the second and third dividing units 12 and 13, the second and The information inputs are connected respectively with the output of the second storage element 16 and with the setting of the excitation degree of the electric motors. The second input of the comparison element 18 is also connected to the setting unit of the motor excitation degree, and the output of the comparison element 18 is connected to the third information input by the third information input of the third dividing unit 13. The output of the second dividing unit 12 is connected to the information input of the third storage element 17, the output of which is connected to the input of voltage regulator 2. The outputs of the control unit 19 are connected to the control inputs of the first dividing unit 11, the first 15 and second 16 storage elements, the pulse frequency generator 7, the third storage element 17, and the third 13 and fourth 14 dividing units, respectively.

The first division block 11 serves to

determine the degree of arousal

Terezisnogo electric motor Ј0-g

five

0

five

0

on the basis of information about the supply voltage U, coming from the voltage sensor 9, and information about the EMF of the electric motor 20, coming from the sensor 10 of the EMF, and measuring the EMF can be carried out either by briefly disconnecting the electric motor from the power source, or using special sensors. The second and third blocks 12 and 13 of the division are designed to determine the ratios of the degree of excitation of the electric motor 20 in various modes, and the fourth block 14 of the division determines the ratio of the voltage variation of the supply voltage of the electric motor. The storage elements 15-17 are operative memory devices and are used to store the current information necessary to implement the control method.

The method of controlling the hysteresis motor is carried out as follows.

A motor voltage is applied to the stator windings, the motor is accelerated to a synchronous rotational frequency, and then a magnetizing pulse of a predetermined volt-second area Uu tu is fed to the stator windings, the value of which is adjusted to provide the required level of motor over-excitation. Obviously, it is possible to vary the pulse-second pulse area by varying either the amplitude UM or its duration tH.

After starting the electric motor 20 and entering into synchronization with the signal from the first output of the control unit 19 in the dividing unit 11, the degree of excitation Ј01 of the electric motor 20 is determined based on the voltage and EMF signals coming from the corresponding setting units 9 and 10: Ј01 E0 / U, where Е „is the emf of the engine. Following this, the value of the supply voltage is memorized by element 15, and the value of the degree of excitation by element 16. Then, at the command of the fourth output of control unit 19, a magnetizing pulse with a volt-second area UK, tUi and phase is fed into the stator circuit of the electric motor 20 using a pulse 3 unit magnetizing, in this case Uu, tu and o / and are formed by the corresponding shaper 5 and 6 based on the signals of the setter 8. Synchronizing input

The control system 4 is connected to the output of the power supply source 1, which provides a strict initial phase pulse-clamping to the supply voltage. After the magnetizing pulse passes the signal from the first output of the control unit 19, the excitation degree of the electric motor 20 Ј0g is determined with the help of the division unit 11. Then, in the division unit 12, the increase in the excitation degree of the electric motor 20 dЈ0 is determined

 0 2t

 -j- and its inverse 1 / DЈ0

C from

which enters the information input of the storage element 17, is stored therein and is fed to the control input of the voltage regulator 2 as a correction signal. The voltage of power supply 1 is reduced to the level of Up U, x 1 / dЈ0. After that, the signal at the first output of the control unit 19 again determines the degree of excitation of the electric motor

oe

and,

compare with the use of the given value of э oeod oe о it is determined in

Ј ;.

ment 18 s

and if Ј

block 13 dividing ratio

with

 ---- formed signal 1 / and Ј

to ass

arrives at the control input of the imaging unit 5 pulse duration. After that, a signal from the fourth output of the control unit 19 again brings up a magnetizing pulse with a volt-second area U y t 0 (U u x

„, I / aЈj.

When controlled according to the method, by adjusting the voltage of the motor supply, it is proportional to the change in the degree of its excitation during pulsed overexcitation, adjusting the parameters of the pulses according to the ratio of the obtained and predetermined excitation levels during repeated pulsed magnetization, provide for an almost limit and stable energy performance of the electric motor.

Experimental verification of the control method has shown that for one

s

1543528

of the types of electric motors used in similar systems, the total reduction in power consumption was by one electric motor from 15 to 50%.

Claims (2)

1. A method of controlling a hysteresis electric motor, in which the supply voltage is applied to the stator winding of the electric motor, the rotor is accelerated to a synchronous rotational frequency, after reaching which the magnetizing pulse is supplied to the stator winding. volt-second square x t and and phase d.u and with what, with about tl and h Energy levels, before applying magnetizing current pulses, measure the excitation degree ЈЈ of the hysteresis electric motor, after the action of the indicated pulses, measure the excitation degree Ј02 of the hysteresis motor and reduce the value of the supply voltage to U -and 1C Co five 0 2. The method according to claim 1, characterized in that, in order to stabilize the energy indices, after said reduction of the supply voltage, the degree of excitation 603 is again measured with a predetermined value of the excitation degree ЈOJa if the measured value of the excitation degree is less than its predetermined value , additionally fed to the stator windings of the hysteresis motor magnetizing pulses with a volt-second area 45 Uu4 , about hall oj where Uu, Uu is the amplitude of the corresponding magnetizing pulse, tM, tu is the duration of the corresponding magnetizing pulse, U1 is the supply voltage. 54J528 Editor A. Orar Compiled by A, Golovchenko Tehred M. Khodanich Proofreader. Cherni Order 407 Circulation 458 VINILI of the State Committee on Inventions and Discoveries at the State Committee on Science and Technology of the USSR 4/5, Raushsk nab., Moscow, 113035, Moscow Subscription