SU1617604A1 - System controlling excitation of d.c. motor - Google Patents

Abstract

This invention relates to electrical engineering and can be used in direct current drives. The aim of the invention is to increase reliability. The excitation control system of the DC motor contains sensors 1 and 2 of the EMF and flow, the outputs of which are connected to the inputs of the first adder 3, block 6 of the excitation setting, the output of which is connected to the input of the second adder 5. The device with one control loop effectively limits the minimum flow at the level specified by the block 8 set the minimum flow. 1 il.

Description

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This invention relates to electrical engineering and can be used in direct current drives.

The purpose of the invention is to increase reliability.

The drawing shows the control system diagram.

The DC motor excitation control system contains sensors 1 and 2, respectively, EMF and magnetic flux, the outputs of which are connected to the inputs of the first adder 3, whose output through rectifier 4 is connected to the first input of the adder 5, the second input of which is connected to the output of task block on the day The inputs w / w 7 for selecting a larger signal with the outputs of the second pusher 5 and block 8 31 of the minimum flow. The inputs | of the excitation torch 9 are connected to the inputs of the block 7 for selecting a larger signal w 2 of the magnetic flux, and the output is connected to the input of the exciter 10, to the output of which the motor excitation winding 11 is connected,

 DC motor drive control is operating in the same way.

When the engine speed is lower than the main signal of the sensor 1 PDS is less than the signal of the sensor 2 flow (current) excitation, the sieve at the output of the adder 3, equal to the difference of the output signals of the sensors 2 and I, does not pass through the rectifier 4.

In this case, the inputs of the exciter regulator 9E receive a reference signal for the excitation flow from the output of block 6 through the block 7 for selecting a larger signal and a feedback signal from the output of sensor I. The excitation regulator 9 acts through the exciter 10 on the winding 11 excitation maintains the nominal flux (current) of excitation,

In the zone above the main engine speed, the signal from the EMF sensor 1 becomes larger than the signal from the flow sensor 2, and at the output of the first adder 3, the signal changes sign and through the rectifier 4 enters the water of the adder 5, which is summed with the reference signal from the reference block excitation. As a result, the excitation flow reference signal supplied to the first input of the excitation controller 9 decreases, which leads to a weakening of the field. Thus, the excitation controller 9 is switched to the EMF control mode. When the signal at the output of the adder 5 is reduced to a value

smaller value of the signal at the output of block 8, the first input of the excitation controller 9 through the block 7 for selecting a larger signal receives the signal for setting the minimum excitation flow. Regulator 9, influence

to exciter 10, maintains the minimum value of the excitation flow (current).

Thus, the control system allows, while maintaining the advantages of the single-loop excitation control variant (ease of implementation and high speed), to limit the minimum excitation flow of the engine, which increases the reliability of operation of the electric drive.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A DC motor excitation control system comprising an excitation command unit, an excitation controller connected to a driver, an EMF sensor, an excitation syringe sensor, a larger selection unit from the drive, the output of which is connected to the first input of the excitation regulator, and two sug matrices , in order to improve reliability, a minimum flow setting unit and rectifier are inserted into it, with the outputs of the EMF sensor and the excitation flow sensor connected to the corresponding inputs of the first an adder, the output of which through the rectifier is connected to the first input of the second adder, the second input of which is connected to the output of the excitation unit, and the output to the first the input of the larger signal selection unit, the second input of which is connected to the output of the minimum flow setting unit, the output of the excitation flow sensor is connected to the second input of the excitation regulator.