System for driving brushless DC motor and method of driving...

Details System for driving brushless DC motor and method of driving... System for driving brushless DC motor and method of driving...

2007-10-16

2007-10-16

Masih, Karen (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S434000, C318S132000, C388S825000

Reexamination Certificate

active

11218421

ABSTRACT:
A brushless DC motor drive system includes a pole-position detector for detecting respective pole positions of permanent magnets of a rotor of a brushless DC motor. A present speed computing unit computes a present speed of the brushless DC motor on the basis of an output signal from the pole-position detector. A speed differential computing unit computes a speed differential between a speed command and the present speed. An energization start time computing unit computes an energization start time in a present instance on the basis of an energization start time in a preceding instance, and the speed differential. An energization start instruction unit instructs energization start upon the elapse of the energization start time in the present instance from a phase changeover point in time. An energization completion time computing unit computes an energization completion time by subtracting the energization start time in the present instance from preceding pulse time. An energization completion instruction unit instructs energization completion upon the elapse of the energization completion time from the phase changeover point in time.

REFERENCES:
patent: 5535481 (1996-07-01), Hartmeier et al.
patent: 2005/0176543 (2005-08-01), Kirkwood et al.
patent: 2000-341925 (2000-12-01), None

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