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US 6,713,924 B1Granted
Brushless motor having isosceles sided stator coils and position detection capability
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorShinji Fukushima
Life of this patent
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Abstract
A three-phase brushless motor includes a rotor with a permanent magnet having P (P is an integer not less than two) polarities and a stator facing the rotor and having plural coils shaped in approx, triangle or trapezoid. A space between adjacent coils is (360/P)×(5/3) degree. Three position-detectors, which detect the position of the rotor, is placed at intervals of (360/P)×(2/3) degree in an area where no coils are placed. This structure allows the coils to be optimally shaped and placed, and realizes to reduce a number of coils as well as improve the motor characteristics.
Claims5
A brushless motor comprising:
- a rotor with a permanent magnet having P (P Is an integer not less than two),
- wherein two extension lines, which extend toward a shaft center of said rotor along both ends of each magnetic polarity of said rotor, form an angle with respect to the shaft center of said rotor;
- and
- a stator facing said rotor and having a plurality of coils,
- wherein any one of the coils has winding-bundles including isosceles sides interlinking with a magnetic field generated by the magnetic polarities,
- wherein two extension lines extending along centers of the winding-bundles of the isosceles sides of the coil cross each other at the shaft center of said rotor and form a vertex angle of 360/P degrees, and
- wherein the vertex angle formed by the two extension lines extending along centers of the winding bundles is equal to the angle formed by the two extension lines extending along both ends of the each magnetic polarity of said rotor.
4 more elements
Dependencies are inferred from the claim text.