US 4,730,150 AGranted

D.C. multi-phase bi-polar brushless motor

AssigneeWoo Y. Choi

InventorsI S. Lee, Jung S. Lee

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Abstract

A D.C. multi-phase brushless motor having M phase stator windings and an N pole rotor, with M and N being integers, a sensor for sensing rotor position and providing rotor position signals to a motor controller is disclosed. The sensor comprises a circular permanent magnet, mounted externally to a motor at one end of a rotor with the magnet having N poles, and M sets of paired Hall effect devices, mounted adjacent the magnet, wherein each of the M sets of paired Hall effect devices are mounted in adjustable relationship to the magnet with respect to radial and angular distance. The sensor is mounted within a housing mounted externally to an end of a motor adjacent the rotor end having the magnet mounted thereon with the M sets of paired Hall effect devices mounted within and upon the housing in adjustable relationship with the magnet.

Claims5

Dependent claims

A bi-polar brushless d.c. motor comprising:

a stator having M phase windings;
an N pole rotor rotatably coupled to said stator;
a circular permanent magnet mounted at one end of said rotor, said magnet having N poles;
M sets of paired Hall effect devices, each Hall effect device in each set of paired Hall effect devices positioned adjacent one another and each set of paired Hall effect devices positioned, with respect to radial and angular distance, adjacent the periphery of said magnet and each Hall effect device in each set of paired Hall effect devices alternately generating spaced apart control signals in response to the angular position of said magnet;
circuit means coupled to said stator M phase windings and said M sets of paired Hall effect devices for receiving input d.c. power and responsive to said control signals for selectively coupling d.c. power to a predetermined one of said M phase windings.

2 more elements

Dependencies are inferred from the claim text.