Prof. Jung-Pyo Hong

Reducing Torque Ripple of BLDC Motor by Varying Input Voltage
2005-10-24 14:41:43 조회수573
AUTHOR : Ki-Yong Nam, Woo-Taik Lee, Jung-Pyo Hong
ORGANIZATION : International Compumag Society
JOURNAL : COMPUMAG
YEAR : 2005.6.26
VOL : I
ISSUE :
PAGE : 176 ~ 177

The Blushless Direct Current(BLDC) motor has of high torque, compact size, and high efficiency. Therefore, the BLDC motor is widely used from computers, household and industrial products, and automobiles. However, the BLDC motor has a disadvantage that is high cost compared with DC motor because it is necessary to use an inverter and controller to remove brush of DC motor[1],[3]. The ideal BLDC motor has a trapezoidal back-EMF and the constant source voltage is inputted. And then the current made by source voltage instantly rise to steady state. Therefore, the torque is produced without torque ripple. However, the current characteristic of the actual BLDC motor is different from the ideal case, because current is influenced by the inductance and it can not rise or fall to the stead state directly as Fig. 1. Also, the current ripple is produced by difference between the rising and falling current in the freewheeling region and rising current continuously increases because of rising time that is longer than the commutation time in high speed. Therefore, the current ripple is produced by influence of the inductance and the torque ripple is affected by current ripple directly[2]. In this paper, the method of reducing torque ripple is proposed by varying the source voltage to flow the current continuously after analyzing circuit for acquiring the current.
 
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