An Improved Microcontroller-Based Sensorless Brushless DC (BLDC) Motor Drive for Automotive Applications

Author

Shao, Jianwen

Author_Institution

ST Microelectron. Power Syst. Applications Lab., Schaumburg, IL

Volume

42

Issue

5

fYear

2006

Firstpage

1216

Lastpage

1221

Abstract

The direct back-electromotive-force (EMF) detection method previously described in a sensorless brushless dc (BLDC) motor-drive system (Proc. IEEE APEC, 2002, pp. 33-38) synchronously samples the motor back EMF during the pulsewidth-modulation (PWM) off time without the need to sense or reconstruct the motor neutral. Since this direct back-EMF-sensing scheme requires a minimum PWM off time to sample the back-EMF signal, the duty cycle is limited to something less than 100%. In this paper, an improved direct back-EMF detection scheme that samples the motor back EMF synchronously during either the PWM on time or the PWM off time is proposed to overcome the problem. In this paper, some techniques for automotive applications, such as motor-rotation detection, and current sensing are proposed as well. Experimental results are presented

Keywords

DC motor drives; automotive engineering; brushless DC motors; microcontrollers; BLDC motor drive; PWM; automotive applications; back-EMF detection method; current sensing; electromotive force; microcontroller; motor rotation detection; pulsewidth modulation; sensorless brushless DC motor drive; Attenuation; Automotive applications; Brushless DC motors; Brushless motors; Commutation; DC motors; Motor drives; Pulse width modulation; Space vector pulse width modulation; Voltage; Back-electromotive-force (EMF) detection; current sensing; motor-rotation detection; sensorless brushless dc (BLDC);

fLanguage

English

Journal_Title

Industry Applications, IEEE Transactions on

Publisher

ieee

ISSN

0093-9994

Type

jour

DOI

10.1109/TIA.2006.880888

Filename

1703714