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An Improved Unipolar PWM Method for bldc motors  

Jeon, Young-Ho (광운대 정보제어공학과)
Cho, Whang (광운대 정보제어공학과)
Choy, Ick (광운대 정보제어공학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.13, no.3, 2008 , pp. 221-228 More about this Journal
Abstract
In the 2-phase excited BLDC motor drives using a unipolar PWM scheme, there exists, in some cases, a unwanted leakage current which flows through the anti -parallel diode in the non-excited phase leg of the inverter. In this paper the cases in which the leakage current exists and the influence of the leakage current are analyzed, and a novel unipolar PWM scheme which can eliminate the leakage current is proposed. The leakage current increases as the motor speed is increased or PWM duty is decreased, and as a result the output power of the motor is reduced considerably. The effectiveness of the proposed unipolar PWM scheme isverified through the comparative simulations and experiments.
Keywords
A unwanted leakage current; Anti-parallel diode; A novel unipolar PWM scheme;
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  • Reference
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