TY - JOUR
T1 - Influence of PWM on rotor eddy-current losses in brushless DC motor
AU - Xie, En
AU - Liu, Weiguo
AU - Luo, Ling
AU - Wang, Pu
PY - 2013/2
Y1 - 2013/2
N2 - The eddy-current losses in the rotor of brushless DC motor (BLDCM) under PWM modulation can mainly be divided into three parts. In terms of space, moving rotor cuts armature magnetic field, and electromotive force (EMF) is induced. In terms of time, variation of both armature magnetic potential caused by PWM and cogging flux density can induce EMF. In this paper, these three parts of EMF are defined as motional EMF, induced EMF and cogging EMF, respectively. Without considering eddy reaction, motional EMF and induced EMF of an 11 kW BLDCM are calculated and analyzed by selecting maximum curved surface and closed curve at typical operating point. It can be found that the induced EMF is higher than motional EMF (cogging EMF is not considered), and the induced EMF is maximum when duty cycle equals to 50%. The rotor temperature rise caused by above three kinds of EMF is obtained respectively by pair-drive loading experiment. The experimental results verify the proposed method very well.
AB - The eddy-current losses in the rotor of brushless DC motor (BLDCM) under PWM modulation can mainly be divided into three parts. In terms of space, moving rotor cuts armature magnetic field, and electromotive force (EMF) is induced. In terms of time, variation of both armature magnetic potential caused by PWM and cogging flux density can induce EMF. In this paper, these three parts of EMF are defined as motional EMF, induced EMF and cogging EMF, respectively. Without considering eddy reaction, motional EMF and induced EMF of an 11 kW BLDCM are calculated and analyzed by selecting maximum curved surface and closed curve at typical operating point. It can be found that the induced EMF is higher than motional EMF (cogging EMF is not considered), and the induced EMF is maximum when duty cycle equals to 50%. The rotor temperature rise caused by above three kinds of EMF is obtained respectively by pair-drive loading experiment. The experimental results verify the proposed method very well.
KW - Brushless DC motor (BLDCM)
KW - Cogging electromotive force
KW - Induced electromotive force
KW - Motional electromotive force
KW - Pair-drive experiment
KW - Rotor eddy-current losses
KW - Rotor temperature rise
UR - http://www.scopus.com/inward/record.url?scp=84875619892&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:84875619892
SN - 1000-6753
VL - 28
SP - 117
EP - 125
JO - Diangong Jishu Xuebao/Transactions of China Electrotechnical Society
JF - Diangong Jishu Xuebao/Transactions of China Electrotechnical Society
IS - 2
ER -