SU1176268A1 - Apparatus for testing electromotor synchronism - Google Patents

Abstract

A device for controlling the synchronization of an electric motor containing a speed sensor, a comparison unit, an indicator, characterized in that, in order to improve accuracy, a first frequency divider with a pulse down ratio generator, a synchronizer, a second frequency divider, a third frequency divider, a delay element are additionally introduced into it. pulse shaper, and the output of the speed sensor is connected to the input of the first frequency divider with the pulse duty factor shaper, the output of which is connected to the main input of the synchronizer, s the clock input of the latter is connected to a power source, and the output is connected to the second frequency divider, the output is connected to a delay element, the output of which is connected to the indicator through the comparator, the inputs of the third frequency divider and the pulse shaper are connected to the power source the pulse shaper input, the output of which is connected to the inputs of the second and third frequency dividers (L and another input of the comparison unit, and the speed sensor input and the other height: source Itani connected with terminals for connection of the controlled object. O) N9 O) 00

Description

The invention relates to electrical engineering and can be used in motor synchronization control devices, in particular, in motor synchronization control devices (gyromotors). The purpose of the invention is to improve the accuracy of the synchronism of the motor by using the tracking of the frequency of the power supply. The drawing shows a block diagram of a device for controlling motor synchronism. The device for controlling the synchronism of the electric motor 1 comprises a series-connected speed sensor 2, a first frequency divider with a pulse duty generator 3, a synchronizer 4, a second frequency divider 5, as well as a third frequency divider 6, delay element 7, pulse shaper 8, and ysely connected comparator unit 9, indicator 10. A device for controlling synchronization of an electric motor operates as follows. The pulses from the speed sensor 2c with a frequency proportional to the rotational speed of the electric motor 1 are fed to the first frequency divider with a pulse duty generator 3 gd, their tracking frequency is divided to half the frequency of the power supply during synchronous rotation of the electric motor, which is necessary for normal synchronizer 4, synchronized power supply frequency 11. Synchronizer 4 produces a temporary one with I scan of the leading edges of pulses arriving at its main input from the first case the frequency of the pulse shaped by the body of the pulse 3, to the front frequency pulse of the power source 11, which is necessary for stable operation of the device to control the synchronism of the motor 1. In addition, the synchronizer 4, triggered by the width (duration) of the positive pulse at its main input, Pulse duty cycle from the first frequency divider with pulse shaper 3, has a direct effect on the accuracy of control of motor synchronism. The pulses from synchronizer 4 are fed to the second frequency divider 5 with a capacitance until the output bit of 128 pulses is filled, where they accumulate. At the same time, the frequency of the power supply is fed to the input of the third frequency divider 6. The third frequency divider 6 has a capacity to fill the output bit of 256 pulses, i.e., upon the arrival of the 256th frequency pulse of the power source, 1 appears at its output, which goes to one of the two inputs of the pulse shaper 8, to the other input of which the frequency of the power source comes. The pulse shaper 8, according to the signal from the third frequency divider 6 and the falling edge of the frequency pulse of the power supply 11, generates a short positive pulse that simultaneously arrives to reset the second frequency divider 5, the third divider; frequency 6 and one of the two inputs of the comparator block 9. With synchronous rotation of the electric motor 1 simultaneously with the appearance of 1 at the output bit of the third frequency divider 6, 1 appears at the output bit of the second frequency divider 5, which are reset with the arrival of a pulse from the ramp pulse 8. However, when resetting 1, at the output bit of the second frequency divider 5 connected to the input of delay element 7, the falling edge of the pulse arriving at the other of the two inputs of the comparison unit 9 is delayed, the comparison unit 9 represents is a D-flip-flop, on the D-input of which a pulse of the delay element 7 arrives, and on the C-input — a pulse from the pulse shaper 8, i.e. if there is 1 at the D-input at the direct output of the D trigger it is recorded 1, and at the inverse output O, which enters the input of the indicator 10 and causes the LED to light up, which corresponds to the signal of the device for controlling synchronism of the electric motor 1, when the rotation speed decreases synchronous speed by a certain value in the counting interval of 256 periods of the frequency of the power supply, determined by the third divider hour 3t

6, the number of pulses accumulated in the second frequency divider 5 will be less than 128, which means during the reset of the second frequency divider 5 on its output bit will be O, which after passing through delay element 7 will go to the D input of the trigger of the comparison unit 9 If there is an O on the D input at the time

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the arrival of the leading edge of the pulse at the C input at the direct output of the D flip-flop of the comparator unit 9 is recorded

ABOUT

and on the inverse output 1, which is fed to the input of the indicator 10 and the LED goes out, which corresponds to the signal Failure of the device to control motor synchronism. ..

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Claims (1)

ELECTRIC MOTOR SYNCHRONOUS CONTROL DEVICE, comprising a speed sensor, a comparison unit, an indicator, characterized in that, in order to improve accuracy, a first frequency divider with a pulse duty conditioner, a synchronizer, a second frequency divider, a third frequency divider, and a delay element are added to it , a pulse shaper, wherein the output of the speed sensor is connected to the input of the first frequency divider with a duty cycle shaper, the output of which is connected to the main input of the synchronizer, the last input of the latter is connected to the power source, and the output is to the input of the second frequency divider, the output is connected to the delay element, the output of which is connected to the indicator through the comparison unit, the inputs of the third frequency divider and pulse generator are connected to the power source, the output of the third frequency divider is connected to the input of the pulse shaper, the output of which is connected to the inputs g of the second and third frequency divider and to another input of the comparison unit, and the input of the speed sensor and the other output of the power source are connected to terminals for connecting the controlled object. SU, "1176268>