A prediction M/T speed measurement system and method

Abstract

The invention provides a prediction M / T speed measurement method. The speed measurement method includes the following steps: obtaining a current encoder pulse number QPOS; detecting the overflow flagbit COEF of a state register, and judging whether the overflow flag bit COEF is equal to the first preset value; when the overflow flag bit COEF is equal to the first preset value, arranging the capture period value as the preset maximum value and resetting the flag bit COEF; when the overflow flag bit is not equal to the first preset value, obtaining the capture timing value and the capture period value; obtaining the first ratio according to the capture timing value and the capture period value; obtaining the rotation direction of the encoder, and obtaining the a first encoder pulse number according to the rotation direction of the encoder, the first fixed point number PosVal and the first ratio; obtaining the second ratio according to the first encoder pulse number, the encoder pulse number of the last period and a preset encoder line number; and obtaining the current speed value after normalization according to the second ratio, the preset sampling period and the preset maximum rotating speed.

Description

technical field [0001] The invention relates to the field of motor speed measurement, in particular to a predictive M / T speed measurement system and method. Background technique [0002] At present, the main methods of motor speed measurement include tachometer generator, rotary transformer, linear grating ruler and encoder, etc. Among them, the incremental photoelectric encoder has the advantages of simple structure, convenient and accurate measurement, long life, etc., and is widely used in the field of modern control . [0003] When the incremental photoelectric encoder is used for speed measurement, the encoder is coaxial with the motor under test, and the rotation direction and speed of the motor can be judged by detecting the output pulse sequence. The most typical methods of pulse speed measurement are frequency measurement method (M method speed measurement), period measurement method (T method speed measurement) and frequency cycle adaptive method (MT method speed ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem in the prior art that when the rotation speed is extremely low, the detection time of pulse speed measurement will increase, and the time delay of measurement will increase, which will limit the bandwidth of speed adjustment, and provides a predictive M / T Velocity measurement system and method

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