Volpe and Koenig, PC
Method for starting single phase BLDCM having asymmetrical air gap
A method for starting a motor having a stator, a rotor, a winding and an asymmetrical air gap is accomplished using several steps. The steps include: (a) providing the motor at standstill; (b) exciting the winding for a specific time period with a current impulse having a first amplitude to obtain a first specific position of the rotor with respect to the stator; (c) decreasing the first amplitude down to a second amplitude gradually by a controller to make the rotor to be positioned at a second specific position with respect to the stator after the specific time period, wherein the second amplitude is one of zero ampere and a specific value close to zero ampere, and the rotor is rotating close to the second specific position with an almost zero rotating speed when the second amplitude is reached.
Delta Electronics, Inc.
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Shih-Ming Weizi Zhigan Wen-Shi Qiong Wanbing Jianping
Huang Wang Wu Huang Yuan Jin Ying