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Mathematical Problems in Engineering
Volume 2013, Article ID 146058, 8 pages
Research Article

Strategy of Starting Sensorless BLDCM with Inductance Method and EMF Integration

1School of Automotive Engineering, Harbin Institute of Technology, Weihai 264209, China
2China Automotive Technology & Research Center, Tianjin 300300, China

Received 13 October 2013; Accepted 2 November 2013

Academic Editor: Hamid Reza Karimi

Copyright © 2013 Wang Dafang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In, conventional 3-stage start-up method of sensorless brushless direct current motor (BLDCM), the rotor is likely to jitter because rotor position cannot be obtained, and the motor is apt to lose step when it starts with load. These defects limit its use in engineering applications. In order to achieve smooth start in specific direction and guarantee start-up success rate with load, a start-up method based on improved inductance method and electromotive force (EMF) integration is proposed applying different voltage vectors according to rotor position interval judged by inductance method and determining integrator start-up time according to rotor initial position and the EMF. Experiments show that the method guarantees smooth acceleration and increases start-up success rate with load.