Motor speed calculation device

Abstract

The invention discloses a motor speed calculation device. A group of speed pulses output from a speed sensor, pulse input A and pulse input B are input to a low-pass filtering module for filtering and are respectively fed to a direction determining module and a pulse selection module; the direction determining module determines the current speed direction according to the phase difference of the pulse input A and the pulse input B, the pulse selection module selects a pulse suitable for calculation from the pulse input A and the pulse input B to output to a frequency calculation module, a zero speed determining module and a duty ratio calculation module; the zero speed determining module is used for determining output a zero speed identifier when the speed sensor does not have output pulse; the frequency calculation module is used for calculating and outputting the pulse frequency; and the duty ratio calculation module is used for calculating and outputting a duty ratio signal of the current pulse. According to the motor speed calculation device, the technical problems of low real-time property, low accuracy, low stability and unsuitableness for multi-path input signal processing and parallel operation functions in the prior art are solved.

Description

technical field [0001] The invention relates to a motor control device, in particular to a multifunctional modular motor speed calculation device. 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 cycle in the f...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a motor speed calculation device, which solves the technical problems in 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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