Research on Commutation Torque Ripple Suppression of Open Winding Brushless DC Motor

doi:10.11985/2019.04.001

Abstract

Abstract:

The open winding brushless DC motor has no neutral point, and the phase windings are electrically isolated, which can realize independent control of each phase. Firstly, the mathematical model of open winding brushless DC motor is introduced, the influence of each phase caused by the mutual inductance and the impact of the diode freewheeling for non-commutation phase with the same bus power supply are analyzed. Secondly, the current commutation process of open winding brushless DC motor during the commutation period is analyzed. It is concluded that if the turn-off and the conduction phase current with the same change rate, under the ideal Back EMF condition, the non-commutation phase current is constant, then the electromagnetic torque remains the same. Thirdly, the working principle and process of overlapping commutation with phase current closed-loop control are given, the voltage applied on turn-off phase and delay shutdown time formulas in overlapping commutation are derived, electromagnetic torque is calculated by the Back EMF which is observed by sliding mode observer. Finally, the method of overlapping commutation with phase current closed-loop control are carried on the Matlab simulation analysis, the experimental results indicate that the control method can realize the commutation torque ripple suppression of open winding brushless DC motor.

Key words: Open winding, brushless DC motor, commutation torque ripple, mutual inductance, overlapping commutation

CLC Number:

TM351

Ling LUO,Qi HUANG,Yuan ZHANG. Research on Commutation Torque Ripple Suppression of Open Winding Brushless DC Motor[J]. Journal of Electrical Engineering, 2019, 14(4): 1-9.

Figures/Tables 14

References 17

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绕组	I_i(0)	I_i(∞)	△I_i	E_i	U_i
A	(U_A–E)/R	(U_A–E)/R	0	E	U_A
B	(U_B₁+E)/R	(U_B₂+E)/R	(U_B₂–U_B₁)/R	-E	U_B₂
C	0	(U_C+E)/R	(U_C+E)/R	-E	U_C

参数	数值
额定电压U_N/V	12
额定功率P_N/W	30
额定转速n_N/(r/min)	2 500
额定转矩T_N/(N·m)	0.115
极对数P	6
相电阻R/mH	0.75
相自感L/mH	0.55
相互感M/mH	0.05
反电势系数K_e/(V/rad·s^-1)	0.041 5
转动惯量J/(kg·m²)	4×10^–5
黏滞摩擦因数B/(N·m·s/rad)	1×10^–5