A Stepping Motor Out-of-Step Error Correction Method Based on Proximity Sensor

Abstract

The invention relates to a stepping motor synchronism loss error correction method based on a proximity sensor. The absolute rotation position of a stepping motor is measured through the proximity sensor, an auxiliary stepping motor direction finding model and a correction algorithm are further utilized to realize accurate error correction for synchronism loss of the stepping motor. Properties of low cost, high precision and high reliability of the proximity sensor are utilized, low-cost demands of synchronism loss error correction of the stepping motor can be satisfied. Through the method, additionally arranging angle measurement sensors such as a photoelectric encoder and a rotary transformer is not needed, but simply arranging the proximity sensor and the corresponding software processing algorithm, output angle error accumulation of the stepping motor can be avoided, long-term accuracy of angle measurement precision is guaranteed, and a quite large cost advantage is realized.

Description

Technical field: [0001] The invention relates to a stepping motor out-of-step error correction method based on a proximity sensor, and the method is applicable to fields such as open-loop control of angular position or angular velocity. Background technique: [0002] A stepper motor is an open-loop control motor that converts electrical pulse signals into angular displacement or linear displacement. In the case of no out-of-step, the speed and stop position of the motor only depend on the frequency and number of pulses of the pulse signal and are not affected by load changes. When the stepping motor receives a pulse signal, the motor will operate according to the set The direction turns to a fixed angle (step angle or step angle), and the motor angular displacement and motor speed are controlled by controlling the pulse number and pulse frequency to achieve precise open-loop control. The number of steps per revolution of the stepping motor is the same, and its step error wi...

AI Technical Summary

Problems solved by technology

When the rotor acceleration is slower than the rotating magnetic field of the stepping motor, the average speed of the rotor is higher than the average rotating speed of the stator magnetic field, or the load inertia of the motor is large, the stepping motor will be out of step

In the open-loop control of angular position and angular rate, the out-of-step of the stepping motor will cause the accumulation of control error, resulting in a decrease in control accuracy

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