Comprehensive measuring method and circuit for electric motor rotating speed and rotor location

Abstract

The method gets the periodic signal and compound signal of encoder through processing the pulse signal, reset signal from encoder and measurement period signal given by measuring man. By using the formula raised by the invention, the MPU can figure out the rotate speed of motor and the position of rotor. The invention can also remove the measuring error for motor caused by radial and axial vibration.

Description

Technical field [0001] The invention relates to a method for measuring the rotation speed and rotor position of an AC motor and a measuring circuit. Background technique [0002] With the development of microelectronics technology, the computing power and reliability of digital control processing chips have been greatly improved. Therefore, in the high-precision AC motor speed control system, fully digitalized with single-chip microcomputer or DSP as the control core is widely used. Control System. In the motor closed-loop feedback control system, the speed and rotor position are two important physical quantities, and their measurement accuracy will directly affect the performance of the control system. [0003] The photoelectric encoder installed on the motor shaft is usually used as the measuring element of the motor speed and rotor position. When the motor rotates, the encoder outputs a digital pulse signal, which is introduced to two counters, one of which counts the encoder ...

AI Technical Summary

Problems solved by technology

[0006] The conventional M/T measurement method is only used to measure the speed of the motor, and cannot measure the position of the motor rotor while measuring the speed

In addition, large-scale units will generate axial and radial vibrations during o

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