Compensation control circuit of direct current motor

Abstract

The invention discloses a compensation control circuit of a direct current motor, comprising a speed-measuring circuit, a speed instruction conditioning circuit, a speed instruction control circuit and a driving buffering brake circuit. The speed-measuring circuit acquires signals U1 and U2 of voltage to ground of two ends of the direct current motor, and generates a speed-measuring signal Uv. The speed instruction conditioning circuit rectifies the voltage of the speed instruction signal into unipolar level, outputs a control signal of positive and negative rotation of the motor and biased-amplifying the rectified speed instruction signal into a speed instruction signal Vg conforming the range specification of the speed-measuring signal Uv. The speed instruction control circuit comprisesan error amplifier and a proportional integral circuit; the error amplifier amplifies error comparison between the speed-measuring signal Uv and the speed instruction signal Vg, and generates a pulsesignal for controlling a semiconductor switch device; and the proportional integral circuit controls the error amplifier. The semiconductor switch device of the driving buffering brake circuit is controlled by the pulse signal and is used for driving buffering brake direct current motor.

Description

technical field [0001] The invention relates to a DC motor compensation control circuit. Background technique [0002] The DC motor compensation control circuit generally includes a speed measuring circuit, a speed command speed regulating circuit and a driving buffer braking circuit. The traditional speed measurement circuit requires an external physical sensor to measure the motor speed, and the output signal of the sensor needs to be demodulated and processed by a filter circuit to obtain a usable speed signal. The circuit is complex, many components are required, the cost is high, and the speed signal is not accurate. high. The traditional speed command speed control circuit adopts open-loop PWM circuit, the circuit is complicated, many components are required, the cost is high, and there is static error in speed control. The traditional drive buffer brake circuit does not use semiconductor switches, the switching speed is slow, close to us, and the switching power con...

AI Technical Summary

Problems solved by technology

The traditional speed measurement circuit requires an external physical sensor to measure the motor speed, and the output signal of the sensor needs to be demodulated and processed by a filter circuit to obtain a usable speed signal. The circuit is complex, many components are required, the cost is high, and the speed signal is not accurate. high

The traditional speed command speed control circuit adopts open-loop PWM circuit, the circuit is complicated, many components are required, the cost is high, and there is static error in speed control

The traditional drive buffer braking circuit does not use semiconductor switches, the switching speed is slow, close to us, and the switching power consumption is large

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