A predictive m/t speed measuring system and method

Abstract

The present invention provides a predictive M / T speed measurement method, said speed measurement method comprising the following steps: obtaining the current encoder pulse number QPOS; detecting the overflow flag COEF in the status register, and judging whether the overflow flag COEF is equal to the first preset Set a value; when the overflow flag COEF is equal to the first preset value, the capture cycle value is set to a preset maximum value and reset the overflow flag COEF; when the overflow flag COEF is not equal to the first preset value, capture timing value and capture period value; according to the capture timing value and capture period value, the first ratio is obtained; the rotation direction of the encoder is obtained, and according to the rotation direction of the encoder, the first fixed-point number PosVal and the first ratio, the first ratio is obtained An encoder pulse number; according to the first encoder pulse number, the encoder pulse number of the last cycle and the preset encoder line number, a second ratio is obtained; according to the second ratio, the preset sampling period and the preset maximum speed to get the normalized current speed value.

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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