Speed control of brushless DC motors

Details Speed control of brushless DC motors Speed control of brushless DC motors

2007-08-21

2007-08-21

Duda, Rina (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S132000, C318S434000, C388S800000, C388S806000, C388S911000

Reexamination Certificate

active

11397800

ABSTRACT:
The speed control apparatus comprises a plurality of Hall sensors, a plurality of switches, a turn-on control circuit, and a gate drive logic. The Hall sensors are configured to detect magnetic rotor sections of a poly-phase brushless DC motor at different positions. The switches apply voltages on a plurality of windings to respectively produce magnetic north or south on stator poles of the poly-phase BLDC motor. The turn-on control circuit generates a conduction time reduction after each output transition of the Hall sensors. The gate drive logic separately turns on or turns off the switches according to different output transitions of the Hall sensors to respectively apply voltages on the windings with the conduction time reduction.

REFERENCES:
patent: 5534763 (1996-07-01), Williams et al.
patent: 5821708 (1998-10-01), Williams et al.
patent: 6285146 (2001-09-01), Harlan

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