Brushless motor

Details Brushless motor Brushless motor

1993-09-21

1997-06-10

LaBalle, Clayton E.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68B, 310 68R, 310156, 310DIG6, H02K 122, H02K 2124, H02K 1100

Patent

active

056379455

ABSTRACT:
A brushless motor includes a minimum number of parts and is assembled easily. A molded, substantially annular plastic permanent magnet on a rotor is magnetized in axially opposite directions alternatively such that a plurality of pairs of S and N poles are formed alternatively. The substantially annular permanent magnet includes an annular portion associated with air-core coils provided on a stator for generating a driving torque for the rotor and associated with a frequency signal generating circuit pattern provided on the stator for generating an electric signal indicative of a rotor speed and a protruded portion protruding from an outer peripheral side surface of the annular portion and associated with a rotor position detecting means provided on the stator for generating an electric signal indicative of a rotor position. A boundary line between an S and N pole of one of the plural pole pairs passes through the protruded portion. Lead portions for connecting terminals of the frequency signal generating circuit pattern to external circuits are formed such that they are overlapped to prevent degradation of frequency signal generator characteristics.

REFERENCES:
patent: 4594524 (1986-06-01), Sudo
patent: 4668884 (1987-05-01), Amao et al.
patent: 4701649 (1987-10-01), Maemine
patent: 4701650 (1987-10-01), Maemine
patent: 4801830 (1989-01-01), Ogino et al.
patent: 4982130 (1991-01-01), Cap et al.
patent: 5028829 (1991-07-01), Cap et al.
patent: 5147510 (1992-09-01), Iura et al.
patent: 5245235 (1993-09-01), Nagai et al.
patent: 5252876 (1993-10-01), Kawai et al.
patent: 5311383 (1994-05-01), Yokouchi

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