Brushless D-C motor

Details Brushless D-C motor Brushless D-C motor

1980-11-12

1983-06-14

Hickey, Robert J.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 318254, H02K 304, H02K 2902

Patent

active

RE0312789

ABSTRACT:
A preferably axial air gap motor has coreless armature stator windings and a permanent magnet rotor. Sensors, such as Hall generators, are provided to sense the rotary position of the rotor and control switching of current to the respective armature windings. The stator armature windings have a maximum of two magnetically active coil sections per pole of the multi-polar rotor, preferably arranged as flat round coils located on the stator in diametrically arranged configuration, the angular spacing between imaginary diametrical lines through the coils being, however, non-uniform over the rotor circumference, and matched to the spacing of rotor poles, the larger angular gaps between the coils providing space on the stator for the sensors and electronic circuitry. In a preferred embodiment, the rotor has numbers of poles divisible by eight.

REFERENCES:
patent: 2847589 (1958-08-01), Haydon
patent: 3096455 (1963-02-01), Hahn
patent: 3118076 (1964-01-01), Held
patent: 3569753 (1971-03-01), Babikyan
patent: 3579277 (1971-05-01), Imahashi
patent: 3766458 (1973-10-01), Nishimura et al.
patent: 3867656 (1975-02-01), Mitsui et al.
Radio Mentor (German Mag. "ME"), vol. 40, No. 2, (1974), pp. 56-58.

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