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Sensorless Control Method of the BLDC Motor Without Neutral Point

중성점을 사용하지 않는 BLDC 전동기 센서리스 제어 기법

  • 심광렬 (울산과학대 전기전자학부) ;
  • 안정렬 (동희홀딩스 미래자동차 부품연구소)
  • Received : 2011.07.05
  • Accepted : 2012.04.26
  • Published : 2012.09.01

Abstract

Generally, brushless DC motor(BLDCM) driving system uses hall sensors or encoders as the mechanical position or speed sensor. It is necessary to achieve the informations of rotor position for driving trapezoidal type brushless DC motor without any position sensor. In this paper, the commutation signals are obtained without the motor neutral voltage, multistage analog filters, A/D converters, or the complex digital phase shift circuits which are indispensable in the conventional sensorless control algorithms. In the proposed method, in stead of detecting the zero crossing point of the nonexcited motor back electromagnetic force for the average motor terminal to neutral voltage, the commutation signal are extracted directly from the specific average line to line voltage with low-pass filter, adder and comparators circuit. In contrast to conventional methods, the neutral voltage is not need; therefore, the commutation signals are insensitive to the common mode noise. Moreover, the complex phase shift circuit can be eliminated. The effectiveness of the proposed method is verified through simulation results.

Acknowledgement

Supported by : 울산과학대학

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