SU1481710A1 - System for stabilizing speed of electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used in high-precision systems for stabilizing the angular velocity of electric drives based on DC motors. The aim of the invention is to improve the accuracy of the system. The system contains a switching unit 9, a frequency setting generator 1, a phase discriminator 2, a 3 position controller, a 4 motor parameter controller, a power amplifier 5, a motor 6 with a current sensor 10 core, an actuator 7, a pulse speed sensor 8, a variable sensor 11 magnetic flux component, reference source 13, adder 14, multiplication unit 12. The system reduces the pulsations of the electromagnetic moment of the engine, due to the crust and jagged pulsations of the magnetic flux. 3 il.

Description

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The invention relates to electrical engineering and can be used in high-precision systems for stabilizing the angular velocity of electric drives based on DC motors.

The purpose of the invention is to increase the accuracy of the system by weakening the pulsations of the electromagnetic torque of the engine.

Figure 1 shows the block diagram of the system topic in Figure 2 - the electrical circuit diagram of the variable component of the magnetic flux; FIG. 3 shows the electrical circuit diagram of the measurement of the derivative of the magnetic flux,

The drive speed stabilization system contains a setting generator .1 clock, phase discriminator 2, 3 position controller, 4 engine parameter controller, power amplifier 5, DC motor 6, actuator 7, speed pulse sensor 8, switching unit 9, sensor 10 current core, sensor 11 variable flux component, multiplication unit 12, reference signal source J3 and adder) 4 "

Sensor And variable component of the magnetic flux (Fig 2) contains a magnetic flux derivative measurement unit 15 and a variable flux component calculator 16, you can use a measuring winding located at the main poles of a constant-current motor 6 as a measurement unit 15 for measuring the magnetic flux derivative. current. Another variant of the approximate measurement of the magnetic flux derivative can be implemented using a measuring current transformer () included in the excitation winding circuit of a DC motor 6, or using an excitation current sensor (RS shunt in FIG. 3) connected to the input a high-pass filter (C-capacitor and R-resistor), the output of which is the output of the magnetic flux derivative measurement unit 15.

Block 16 for calculating the variable component of the magnetic flux can be realized either as an integrator with a reset, or as an inertial link (Fig. 2).

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The system of stabilization of the speed of the drive works as follows.

In the speed stabilization mode, the pulses of the frequency setpoint generator 1 are fed to the input of the phase discriminator 2, to the other input of which pulses are fed from the pulse velocity sensor 8. The output voltage of the phase discriminator 2 is transformed by the 3-position regulator and, as a task, by the magnitude of the electromagnetic moment is fed to the first input of the regulator 4, which is compared with the output voltage of the block 12. The input of the block 12 is supplied by the voltage of the current corr 10 proportional to the current of the motor core 6 "To the other input of the multiplication unit 12 comes from the output of the adder 14 the sum of the output signals of the source 13 of the reference signal proportional to the average value of the magnetic flux and the output voltage of the sensor variable 11 is a magnetic flux component. I

Thus, multiplication unit 12 performs feedback on the electromagnetic moment. Regulator 4 determines the inequality of the set and actual values of the moment and acts through the power amplifier 5 on the engine 6, thereby suppressing the pulsations of the electromagnetic moment caused by pulsations of the magnetic flux and other reasons, such as fluctuations in supply voltage. In this case, the pulsations of the electromagnetic moment, caused by pulsations of the magnetic flux, are suppressed in the high-speed control loop of the moment, having little effect on the speed of the electric drive. The degree of suppression of the velocity pulsations depends on the value of the small time constant Tm.

In transient conditions, when the frequency of the reference frequency generator 1 changes, a signal appears at the first output of block 9, which disconnects the first input of the regulator 4 from the output of the regulator 3 of the position. Depending on the mismatch between the frequencies of the reference and the pulse speed sensor 8, from the outputs of block 9, the corresponding fourth and fifth inputs of the electromagnetic torque controller 4 are received

Signals of different sign and constant in time, providing braking or acceleration of the drive

If the frequency of the reference is close, s-second is connected to the second input of the phonon and the frequency of the pulse sensor 8 speed unit 9 again connects the input of the regulator 4 to the output of the regulator 3 position and simultaneously removes

the second discriminator and with the second input of the switching unit, the first output of which is connected to the input of the connection, or the first information input of the resistive signal from the corresponding inputs of the regulator O of the motor parameter generator, the receiver 4.

Thus, the system has a higher accuracy of stabilization of speed due to the additional reverse

connection by the variable parasitic composition-15 to the outputs of the switching unit, o. t-flyer electromagnetic moment.

Formula

the invention

In order to improve the accuracy of the system, a variable component of the magnetic flux component, an multiplication unit, an adder and a reference signal source connected by an output to the first input of the adder whose output is connected to the first input of the unit multiply connected by the output to

In order to improve the accuracy of the system, a variable component of the magnetic flux component, an multiplication unit, an adder and a reference signal source connected by an output to the first input of the adder whose output is connected to the first input of the unit multiply connected by the output to

The drive speed stabilization system, containing the reference frequency generator, the output of which is connected to the first input of the switching unit and to the first input of the phase discriminator connected by output 25 to the second information input of the regulator input of the position controller, the output of the motor parameter controller, the second which is connected to the first information input of a motor parameter controller connected by an output to the input of a power amplifier, the output of which is 30 of the engine, the output of a current sensor of which is connected to the input of an engine , output - p is connected to the second input of the smart unit connected to the current sensor.

the adder input is connected to the output of the variable component of the magnetic flux sensor connected to the output 1481710 4

core and with the executive mechanism, the output of which is connected to the input of the pulse speed sensor, the output of the discriminator and the second input of the switching unit, the first output of which is connected to the input of the minimum control signal of the maximum control signal the signal of which is connected respectively to the second and third outputs of the switching unit, o. t-

In order to increase the accuracy of the system, a variable component of the magnetic flux component, an intelligent block, an adder and a reference signal source are connected to the first input of the adder, the output of which is connected to the first input of the multiplier unit. connected to the output

the second information input of the controller of the parameters of the engine, the second blow of the engine, the output of the current sensor core is connected to the second input of the intelligent unit.

the second information input of the controller of the parameters of the engine, the second blow of the engine, the output of the current sensor core is connected to the second input of the intelligent unit.

the input of the adder is connected to the output of a variable-flux component sensor connected to the output .2

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Claims (1)

Claim An electric drive speed stabilization system 20, comprising a reference frequency generator, the output of which is connected to the first input of the switching unit and to the first input of the phase discriminator, connected by an output to the '25 position controller input, the output of which is connected to the first information input of the motor parameter controller connected output to the input of the power amplifier, the output of which is connected to the input of the motor on the 30th, the output of which is connected to the current sensor. % 710 'of the armature and with an actuator, the output of which is connected to the input of the pulse speed sensor, the output of which is connected to the second input of the phase discriminator and to the second input of the switching unit, the first output of which is connected to the input input of the first information input of the engine parameter regulator, inputs of the minimum control job. th signal setting the maximum control signal which is connected respectively to the second and third outputs of the switching unit, o. characterized in that, in order to increase the accuracy of the system, it includes a sensor of a variable component of the magnetic flux, a multiplication unit, an adder and a reference signal source connected to an input to the first input of the adder, the output of which is connected to the first input of the multiplication unit connected to the output to the second information input of the motor parameter controller, the second input of the adder is connected to the output of the sensor of the variable component of the magnetic flux connected to the motor output, the output of the armature current sensor is connected to the second the course of the multiplication block. Fie. 2 FieZ