Study of direct back EMF detection for sensorless brushless DC motor
ZOU Ji-bin, JIANG Shan-lin, LIANG Wei-yan
Dept. of Electrical Engineering,Harbin Institute of Technology,Harbin 150001,China
Abstract:
In this paper,a new rotor position detecting method for the sensorless control of brushless DC motor ( BLDCM) is introduced. It obtains the phase back EMF signal from the motor terminal voltage by properly choosing the PWM and sensing strategy directly and needn’t the motor neutral point voltage information. The paper analyzes both the steady-state of PWM on the high side modulator mode which doesn’t consider the parasitic capacitance Coes in the switches and the transient-state of PWM on the high side modulator mode which considers the parasitic capacitance Coes in the switches in detail. The experimental results verify that the proposed method is not sensitive to switching noise,no filtering is required,and good motor performance is achieved within a wide speed range.
Key words: BLDCM sensorless Back EMF PWM
DOI：10.11916/j.issn.1005-9113.2010.04.004
Clc Number:TM33
Fund:
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Study of direct back EMF detection for sensorless brushless DC motor
本站小编 哈尔滨工业大学/2019-10-23
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