A control method for a linear motor

By using real-time acquisition and segmented judgment of the motor's back electromotive force, the problems of lag and high cost of external sensor adjustment during the shearing process of linear motors are solved, and the real-time adjustment and constantness of motor speed and torque are realized.

CN121689895BActive Publication Date: 2026-07-14XIAMEN CHIPSUN SCIENCE & TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAMEN CHIPSUN SCIENCE & TECHNOLOGY CO LTD
Filing Date
2025-12-01
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Conventional linear motors require external sensors to obtain resistance information during the shearing process in order to adjust torque and speed, resulting in high cost and poor adjustment lag.

Method used

A linear motor control method is adopted, which calculates the initial duty cycle and frequency through the main control module, collects the average value of the motor's back electromotive force in real time, judges the current state in segments and adjusts the actual duty cycle and frequency to regulate the motor's speed and torque in real time.

Benefits of technology

It enables real-time adjustment of motor speed and torque under different loads, keeping them basically constant, thus avoiding the high cost and lag of sensors.

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Abstract

The application relates to the field of motor control, in particular to a control method of a linear motor, which comprises a motor driving module, a main control module and a control module, the pin MOTO1, the pin MOTO4 and the pin MOTO3 and the pin MOTO2 of the main control module output two groups of complementary duty cycle driving signals to the motor driving module, and the control end of the control module is electrically connected with the main control module; the initial battery voltage V is used to generate an initial duty cycle and an initial frequency f, and in the actual use process of the electric clipper, the average value e of the sum of the reverse electromotive force of the motor is acquired in real time, the range of the reverse electromotive force is segmented, the average value of the sum of the reverse electromotive force in the current state is judged to fall into which segment of the range, a control value g is obtained, the actual control duty cycle Pout and the actual frequency F are changed according to the size of g, the rotating speed and the torque of the motor under different loads are adjusted in real time, and the rotating speed and the torque are kept basically constant.
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Citation Information

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