Reducing the electromagnetic exciting force of BLDC motors by Optimizing pole arc coefficient

ABSTRACT

A novel method of reducing the electromagnetic exciting force of PMBLDCM (permanent magnet brushless DC motor) by optimising the pole embrace is proposed. Firstly, the expression of the Fourier decomposition coefficient of the permanent magnet’s magnetomotive force is derived, and electromagnetic vibration force under no load condition is determined by the classical noise principle. The electromagnetic force in different pole embrace with radial magnetisation and parallel magnetisation is also calculated. Furthermore, a novel approach is brought out to suppress the exciting force which plays an important role in the electromagnetic noise by selecting the pole arc coefficient reasonably. The frequency spectrum of the main order excitation force wave is obtained by space and time Fourier decomposition. The results of finite element calculation proved the accuracy of the proposed method.

KEYWORDS:

• Electromagnetic vibration
• exciting force
• pole arc coefficient
• permanent magnet BLDC

Acknowledgements

This study was supported by The Doctoral Startup Research Program in 2017 of the Binzhou University “Design of Electrical System for Oilfield Electric Operation Equipment with Electric Energy Storage” (2017Y02) and The Major Research Project in 2017 of the Binzhou University “Research on Key Technologies of Hybrid Power Supply of Power Battery and Power Grid” (2017ZDL04).

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the The Major Research Project in 2017 of the Binzhou University [2017ZDL04]; The Doctoral Startup Research Program in 2017 of the Binzhou University [2017Y02] Key projects of Natural Science Foundation of Shandong Province in 2020[ZR2020KC008]; Research and innovation team of Binzhou University:Research and innovation team of aviation intelligent control and special motor; Binzhou Key Laboratory: Binzhou Key Laboratory of electric drive.

Notes on contributors

Zhang Ran

Zhang Ran (1983-),male, lecture in the school of electrical engineering of Binzhou University. He received the PhD degree from Shandong University, China. Now he is the vice dean of the school of electrical engineering on secondment. His mainly research is focused on the control and simulation of permanent magnet motors in new energy vehicles. He has published more than 20 papers on the research of permanent magnet motors.