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A Novel Low Cost Drive System for Brushless DC Motors

Dayi Li

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Abstract

For the BLDCM which has a general crest width of the back-EMF waveform,two kinds of torque ripple condition when drived by sine-wave current as well as by square-wave current were analyzed and compared in this paper.A low cost current-sensorless vector control drive for BLDCM which has a pseudo-sinusoidal back-EMF waveform with only low-resolution position sensor was proposed.The position estimation algorithm was based on average rotor speed,and the simulation validated the effectiveness of the proposed drive system.

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What this paper is about

For the BLDCM which has a general crest width of the back-EMF waveform,two kinds of torque ripple condition when drived by sine-wave current as well as by square-wave current were analyzed and compared in this paper.A low cost current-sensorless vector control drive for BLDCM which has a pseudo-sinusoidal back-EMF waveform with only low-resolution position sensor was proposed.The position estimation algorithm was based on average rotor speed,and the simulation validated the effectiveness of the proposed drive system.

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Available abstract

For the BLDCM which has a general crest width of the back-EMF waveform,two kinds of torque ripple condition when drived by sine-wave current as well as by square-wave current were analyzed and compared in this paper.A low cost current-sensorless vector control drive for BLDCM which has a pseudo-sinusoidal back-EMF waveform with only low-resolution position sensor was proposed.The position estimation algorithm was based on average rotor speed,and the simulation validated the effectiveness of the proposed drive system.

Key concepts: Waveform, Control theory (sociology), Torque ripple, DC motor, Rotor (electric), Sine wave, Position (finance), Ripple

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