Rotation speed closed-loop control circuit for motor

Abstract

The invention provides a rotation speed closed-loop control circuit for a motor. The rotation speed closed-loop control circuit is matched with the motor and comprises a drive IC chip, an RC integrating circuit, a dual operational amplifier comprising a first operational amplifier and a second operational amplifier, and an RC charging and discharging circuit, wherein the drive IC chip is provided with a drive control end connected with the motor and is also provided with a voltage signal input end and a square signal output end; an input end of the RC integrating circuit is connected with the square signal output end of the drive IC chip; the output end of the RC integrating circuit is connected with an in-phase input end of the first operational amplifier; an inverting input end of the first operational amplifier is connected with a resistance divider circuit and an output end is connected with the in-phase input end of the second operational amplifier through the RC charging and discharging circuit; and the inverting input end of the second operational amplifier is connected with the corresponding output end and then connected with a voltage control signal input end of the drive IC chip. Through implementation of the rotation speed closed-loop control circuit for the motor, the cost is low, the faults are fewer and rotation speed closed-loop control can be achieved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a motor speed closed-loop control circuit. Background technique [0002] The brushless DC motor drive is mainly when the winding coil of the stator is energized, and the Hall sensor is used to judge the magnetic pole position of the permanent magnet rotor, and the direction of the current flowing through the winding coil of the stator is converted to generate an alternating magnetic field, and the permanent magnet rotor is repelled to continue to rotate. . Therefore, it is necessary to do further research on the motor speed control technology. [0003] In the known motor speed control technology, the voltage regulation circuit is usually used to adjust the input voltage of the driver IC chip to realize the control of the motor speed. Although the known control technology can make the motor run at a constant speed, the motor cannot rotate Accurate speed closed-loop control...

AI Technical Summary

Problems solved by technology

[0003] In the known motor speed control technology, the voltage regulation circuit is usually used to adjust the input voltage of the driver IC chip to realize the control of the motor speed. Although the known control technology can make the motor run at a constant speed, the motor cannot rotate Accurate speed closed-loop control is realized in the process, and the cost is high and there are many faults

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