A stepping motor current control method based on predicted conduction and dynamic freewheeling

By using a predictive conduction and dynamic freewheeling current control method, the problems of inaccurate average current tracking and inconsistent switching frequency in stepper motor current control are solved, thereby achieving motor torque stability and noise reduction, and improving the adaptability and precise positioning capability of the motor system.

CN122247253APending Publication Date: 2026-06-19SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
Filing Date
2026-05-22
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

Existing stepper motor current control technology cannot accurately track the average current, resulting in insufficient motor output torque. Furthermore, the inconsistent switching frequency leads to vibration and noise, and it cannot achieve adaptive dynamic adjustment of the freewheeling strategy under dynamic operating conditions.

⚗Method used

A current control method based on predictive conduction and dynamic freewheeling is adopted. By constructing a dual closed-loop system for current and PWM switching frequency and a multi-mode adaptive strategy, the charging and freewheeling stages are controlled in segments. The current and frequency are adjusted in real time to achieve accurate tracking of average current and constant switching frequency, and adaptive adjustment is performed under dynamic operating conditions.

🎯Benefits of technology

It achieves precise closed-loop tracking of average current, maintains a constant PWM switching frequency, reduces motor operating noise and vibration, improves the operating stability and adaptability of the motor system, and meets the precision positioning requirements of high-end application scenarios.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a stepper motor current control method based on predictive conduction and dynamic freewheeling, relating to the field of motor control technology. The invention divides each PWM cycle into a charging phase and a freewheeling phase consisting of a first slow decay phase, a first and second fast decay phase, and a second slow decay phase. The duration of each phase is controlled to determine the actual chopping cycle. The average current of each cycle is estimated, and the difference between the estimated average current and the reference current is calculated to obtain the average current tracking error for each cycle. Furthermore, by constructing a dual closed-loop current and frequency control system and a multi-mode adaptive strategy, the invention effectively solves problems such as deviations in average current, inconsistent switching frequencies, and the inability to achieve adaptive dynamic adjustment of the freewheeling strategy under dynamic operating conditions. This method can accurately track the average current while maintaining a constant frequency, and can also achieve adaptive dynamic adjustment of the freewheeling strategy under dynamic operating conditions, thus improving the motor control accuracy and operational stability.
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