Brushless d.c. motor

Details Brushless d.c. motor Brushless d.c. motor

1999-06-23

2000-05-16

Ro, Bentsu

Electricity: motive power systems

Limitation of motor load, current, torque or force

318254, H02P 600

Patent

active

060641649

ABSTRACT:
The invention relates to a brushless d.c. motor having a commutation circuit for the commutation of phase currents in order to generate a given commutation angle in a given mode of operation of the d.c. motor. In order to guarantee a satisfactory performance of the motor for all modes of operation the commutation circuit is switched between a plurality of modes in which different commutation angles are generated with a switching frequency which is substantially higher than the operating frequency of the motor. The invention is particularly suitable for the use in brushless d.c. motors for domestic appliances such as food processors.

REFERENCES:
patent: 3908130 (1975-09-01), Lafuze
patent: 4246518 (1981-01-01), Kogler et al.
patent: 4751438 (1988-06-01), Markunas
patent: 5200675 (1993-04-01), Woo
patent: 5583404 (1996-12-01), Karwath et al.

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