Brushless d.c. motor having rotor position-dependent control mea

Details Brushless d.c. motor having rotor position-dependent control mea Brushless d.c. motor having rotor position-dependent control mea

1975-04-23

1977-06-14

Schaefer, Robert K.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318439, H02K 2900

Patent

active

040300056

ABSTRACT:
A brushless d.c. motor comprises a stator having stator winding means thereon, a permanent magnet rotor rotatable relative to the stator and a rotor position-dependent semiconductor commutating means coupled to the stator winding means for controlling the currents in the stator winding means. Further provided is means including amplifying means responsive to the outputs of the control means for reducing the currents in the stator winding means at predetermined rotor position ranges to substantially zero. The semiconductor control means is preferably a Hall generator.

REFERENCES:
patent: 3716769 (1973-02-01), Brunner
patent: 3840761 (1974-10-01), Muller
patent: 3873897 (1975-03-01), Muller

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