Measuring method of rotating speed of self-adaption motor for switching hysteresis loop

A technique of motor speed, measurement method, applied in the direction of devices using optical methods, etc.
CN103033639BInactive Publication Date: 2015-01-07BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2015-01-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

A measuring method of the rotating speed of a self-adaption motor for switching a hysteresis loop is suitable for a motor provided with an incremental optical-electricity encoder. First, a hysteresis loop switching method is used for judging which rotating speed section VS does the rotating speed n belong to. Second, according to the rotating speed section VS, the number of the pulse NP of the encoder in next measuring period is set in a self-adaption mode. Third, the time span Tb of NP encoder pulses is measured. Then, combining the NP, the Tb and the encoder wire number m, and the rotating speed n of the motor is calculated. At last, the hysteresis loop switching method is used for judging which rotating speed section VS does the rotating speed n belong to, and rotating speed measuring enters into a next period. Through the method of combining hysteresis loop switching and self-adaption, accurately and fast measuring the rotating speed of the motor without oscillation in a full rotating speed range is achieved, and the shortcoming of contradictions among the accuracy, fast response and speed oscillation in an existing measuring method of the rotating speed of the motor is overcome.
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Description

technical field

[0001] The invention relates to the technical field of motor speed measurement, in particular to a speed measurement method for a motor equipped with an incremental photoelectric encoder. Background technique

[0002] In many fields such as industrial automation, robotics, automobiles, precision CNC machine tools, aerospace, etc., photoelectric encoders are usually used to measure the motor speed to realize closed-loop and semi-closed-loop control of the system. The commonly used methods to process the photoelectric encoder signal to realize the motor speed measurement are: T method, M method and MT method. The T method is limited to low-speed measurement, the M method is limited to high-speed measurement, and the MT method has good accuracy in the entire speed range. However, if the sampling time is selected to be too long in order to improve the low-speed measurement accuracy, the response of the high-speed section will be reduced. Speed; if the sampling t...

Claims

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