Motor commutation

Details Motor commutation Motor commutation

1992-06-03

1994-06-28

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310256, 310DIG3, 32420725, H02K 1100, H02K 112, G01B 714

Patent

active

053250052

ABSTRACT:
A brushless electric motor with Hall-effect sensors is configured to provide its stator structure with a portion which projects axially away from a main armature. The projecting portion is radially congruent with a second, smaller armature coaxial with the main armature, with a portion of a sleeve in which the sensors are disposed in circumferentially spaced configuration, and with a laminated annular shield iron. The annular shield iron is radially interposed between the projecting portion of the stator structure and the sensors. In this configuration, the shield iron serves to close the magnetic field originating from the second armature and interacting with the sensors while simultaneously shielding the sensors from field effects attributable to current flow in the axially projecting portion of the stator structure.

REFERENCES:
patent: 3805134 (1974-04-01), Osamu et al.
patent: 4434389 (1984-02-01), Langley et al.
patent: 4629948 (1986-12-01), Tassinario
patent: 4674178 (1987-06-01), Patel
patent: 4850812 (1989-07-01), Voight
patent: 4952830 (1990-08-01), Shirakawa
patent: 4992688 (1991-02-01), Cap et al.
patent: 5053664 (1991-10-01), Kikuta et al.
patent: 5148070 (1992-09-01), Frye et al.

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