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.

Inactive Publication Date: 2015-01-07
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for measuring the rotational speed of a motor, to realize the non-oscillating, self-adaptive and high-precision rotational speed measurement of a motor equipped with an incremental photoelectric encoder, so as to overcome the shortcomings of the existing motor rotational speed measurement method. , fast responsiveness and speed oscillation have contradictory defects

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

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Embodiment Construction

[0043] The specific implementation of the present invention will be further described below in conjunction with accompanying drawing, as figure 1 Embodiments of the present invention are realized by the following steps:

[0044] Step 001: start;

[0045] Step 002: Use the hysteresis switching method to determine which speed segment VS the speed n belongs to;

[0046] Step 003: Adaptively set the encoder pulse number NP in the next measurement period according to the speed segment VS;

[0047] Step 004: measure the time length Tb of NP encoder pulses;

[0048] Step 005: Calculate the motor speed n;

[0049] Return to step 002.

[0050] Among them, step 002 uses the hysteresis loop switching method to determine which speed segment VS the speed n belongs to. Loop switching, there are a total of N switching hysteresis loops, such as figure 2 Assuming that the kth (k=1,2,...N) upper limit speed value of switching hysteresis is H(k), the lower limit speed value is L(k), and the...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/36
Inventor 丑武胜黄海明张佐江
Owner BEIHANG UNIV
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