Importance

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Abstract

A stator assembly operated in a 2-phase drive manner including first and second stator coils wound in a star shape with a plurality of projections and a plurality of grooves, and arranged with a predetermined phase difference; and an annular supporting body into which the first and second stator coils are inserted for supporting the coils, insulating them from each other. Each stator coil includes four projections and four grooves, and there is a phase difference .theta. between the first and second stator coils, the difference determined by the following equation: .theta.=360/2P.+-.360/P, wherein P denotes the number of a rotor's magnetic poles. A brushless direct-current motor operated in a 2-phase drive manner includes a stator having first and second stator coils wound in a star shape with a plurality of projections and a plurality of grooves, and arranged with a predetermined phase difference; a shaft rotatably supported on a case; at least one disk-shaped multi-pole rotor supported by the shaft with an air gap from the stator in an axial direction; first and second location sensors provided to the stator with the same phase difference as that of the first and second stator coils for detecting the rotor's magnetic pole; and a driving control circuit driving the first and second stator coils in response to the detection of the magnetic pole of the rotor by the first and second location sensors, wherein said phase difference is determined by the equation: .theta.=360/2P.+-.360/P (P=the number of a rotor's magnetic poles).

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First Claim