Affiliations: [a] Department of Electrical Engineering, Harbin Institute
of Technology, Harbin, Heilongjiang, China | Université Laval, Canada | Tohoku University, Japan
Correspondence:
[*]
Corresponding author: Yongxiang Xu, Department of Electrical
Engineering, Harbin Institute of Technology, West Dazhi Street, Harbin,
Heilongjiang, China. Tel.: +86 451 86413613 603; Fax: +86 451 8641361 607;
E-mail: xuyx@hit.edu.cn
Abstract: Commutation angle is a key design criterion when brushless DC (BLDC)
motors sensorlessly operate based on the detection of back electromotive force
(EMF) zero-crossing and must be designed significantly less than 30 electrical
degree. The paper describes a detailed investigation on the commutation angle
of brushless DC motors with 120° voltage source inverter. Analytic method
is applied to analyze the influence factors. The proposed design principles can
provide a clear guide for the adjustment of system parameters. Then two
criteria and an estimation method based on approximate anlytical solution of
commutation angle are presented with experimental validation.
Keywords: Commutation angle, brushless DC motor, 120° voltage source inverter, analytic analysis, criteria
