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Title: An adaptive variable frequency control method for motor speed based on PLC

Authors: Bingyu Wang

Addresses: Department of Mechanical and Electrical Engineering, Yongcheng Vocational College, Yongcheng, 476600, China

Abstract: The traditional fixed frequency motor drive method is no longer able to meet the response requirements of dynamic loads under complex working conditions, resulting in high steady-state errors and overshoot in motor speed variable frequency control. Therefore, a PLC based motor speed adaptive variable frequency control method is proposed. Firstly, an efficient and stable motor speed control architecture was constructed using the USS protocol and RS485 interface. Secondly, the timing interrupt mechanism and high-speed counter are used to collect the pulse signal of the motor encoder in real time and calculate the speed. Finally, based on the fuzzy PID control strategy, adaptive variable frequency control of motor speed is achieved. The experimental results show that the method proposed in this paper has almost zero error in the steady-state error test of motor speed, and the highest overshoot suppression rate reaches 97.34%.

Keywords: PLC technology; motor speed; time base interruption; fuzzy PID; frequency conversion control.

DOI: 10.1504/IJIMS.2026.154617

International Journal of Internet Manufacturing and Services, 2026 Vol.12 No.5, pp.1 - 16

Received: 12 May 2025
Accepted: 30 Aug 2025
Published online: 07 Jul 2026 *