Motor speed calculating method

Abstract

The invention discloses a motor speed calculating method, which carries out low-pass filter treatment on pulse input A and pulse input B. Each one of the filtered pulse input A and pulse input B is output in two paths for pulse selection and direction judgment. In the direction judgment, a current speed direction is judged according to a phase difference of the pulse input A and the pulse input B, and a direction signal is output. In the pulse selection, one pulse suitable for calculation is selected from the pulse input A and the pulse input B and is output by dividing into three paths for frequency calculation, zero-speed judgment and duty ratio calculation. In the zero-speed judgment, a zero-speed identifier is output when a current speed sensor has no output pulse. In the frequency calculation, a pulse frequency is processed, calculated and output. In the duty ratio calculation, a duty ratio signal under the current pulse is processed, calculated and output.. With the adoption of the motor speed calculating method provided by the invention, the technical problems that the motor speed calculating method in the prior art has low instantaneity, accuracy and stability, and is not suitable for multipath input signal treatment and parallel calculation function can be solved.

Description

technical field [0001] The invention relates to a control method of a motor, in particular to a speed calculation method of a multifunctional modular motor. Background technique [0002] The current mainstream speed sensors are all pulse type, that is, a set of pulses is used to represent the current rotation speed and direction, and the user needs to calculate the frequency and phase relationship of the pulses to obtain the actual speed and direction. For most of the current controllers, the speed signal is an important key parameter, as long as there is a short-term inaccuracy, it will cause major failures. In the actual application process, the speed signal is often susceptible to interference and has variability, which requires its acquisition and processing method must have real-time, accuracy, stability and anti-interference. [0003] The existing calculation method is to use the pulse capture module of the processor to receive the signal, and calculate the pulse cycl...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a motor speed calculation method, which solves the technical problems of the prior art that the real-time performance, accuracy and stability are not high, and it is not suitable for multi-channel input signal processing and parallel computing functions

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