Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1995-02-07
1997-03-11
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 68R, 310 67R, 310261, 310156, 73862, H02K 1100
Patent
active
056104570
ABSTRACT:
A brushless motor including: a rotor casing having a cylindrical wall with an opening, the rotor casing holding a magnet therein, the magnet having an exposed portion which is exposed through the opening of the rotor casing; a stator core having drive coils; Hall elements for detecting the magnetic field of the magnet, the Hall elements being arranged outside the cylindrical wall of the rotor casing; a drive circuit applying drive currents to the drive coils in accordance with output signals of the Hall elements; a magnetic flux varying member provided at a point on the cylindrical wall of the rotor casing; and an index signal processing circuit for generating an index signal in accordance with an output signal of one of the Hall elements.
REFERENCES:
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patent: 4952830 (1990-08-01), Shirakawa
patent: 4961017 (1990-10-01), Kakinoki et al.
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patent: 5252873 (1993-10-01), Hamamoto et al.
patent: 5412999 (1995-05-01), Vigmostad et al.
patent: 5440185 (1995-08-01), Allwine, Jr.
Dougherty Thomas M.
Enad Elvin G.
Kabushiki Kaisha Sankyo Seiki Seisakusho
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