Brushless motor drive device

Details Brushless motor drive device Brushless motor drive device

2005-08-02

2005-08-02

Masih, Karen (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S132000, C318S434000, C318S779000, C318S801000

Reexamination Certificate

active

06924611

ABSTRACT:
A Hall sensing circuit generates a positional detection signal representative of a positional relationship between a rotor and a phase coil of a motor. A signal synthesizing circuit transforms the positional detection signal to a driving signal. Based on a comparison of the driving signal and a high-frequency reference signal, a pulse signal is generated for controlling a switching circuit to dive the motor. A current error signal is supplied through feedback to adjust a relative relationship between an amplitude of the drive signal and an amplitude of the high-frequency reference signal, thereby changing a duty ratio of the pulse signal. A duty-ratio limiting circuit is provided to limit the duty ratio of the pulse signal for ensuring a reliable rotation of the motor.

REFERENCES:
patent: 3585517 (1971-06-01), Herbert
patent: 5811949 (1998-09-01), Garces
patent: 6710568 (2004-03-01), Fujii
patent: 6710572 (2004-03-01), Okubo
patent: 2003/0020431 (2003-01-01), Kiuchi et al.
patent: 2003/0052643 (2003-03-01), Sweo

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