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A single-phase brushless motor which can rotate smoothly by a uniform torque over an entire range of rotation with reduced torque ripples, without generating a high cogging torque for allowing self-starting of the motor. The motor comprises a field magnet as a rotor having 2P north and south magneti

A single-phase brushless motor which can rotate smoothly by a uniform torque over an entire range of rotation with reduced torque ripples, without generating a high cogging torque for allowing self-starting of the motor. The motor comprises a field magnet as a rotor having 2P north and south magnetic poles, either the north or the south poles having a width equal to an electrical angle of about 120 degrees while the other poles have a width equal to an electrical of about 240 degrees. The field magnet is mounted for rotation in an opposing relationship to a stator armature core which has a plurality of radially extending stator poles formed in a circumferentially equidistantly spaced relationship thereon. A plurality of stator coils for two phases are wound selectively on the stator poles. An electric circuit detects the position of the field magnet to energize the armature coils for the two phases alternately for an electric angle of about 180 degrees.

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A single-phase brushless motor, comprising a field magnet as a rotor having 2P, P being an integer equal to or greater than 1, alternate north and south magnetic pole zones, each of the north and south magnetic pole zones of said field magnet having an angular width equal to an electrical angle of a

A single-phase brushless motor, comprising a field magnet as a rotor having 2P, P being an integer equal to or greater than 1, alternate north and south magnetic pole zones, each of the north and south magnetic pole zones of said field magnet having an angular width equal to an electrical angle of about 120 degrees while each of the other magnetic pole zones has an angular width equal to an electrical angle of about 240 degrees, a stator armature core having a plurality of stator poles formed thereon in an opposing relationship to said field magnet with an air gap left therebetween, a plurality of armature coils wound on said stator poles of said stator armature core and including first n, n being an integer equal to or greater than 1, armature coil or coils for the phase A wound on one or ones of said stator poles formed at a position or positions of an electrical angle of about mㆍ(360ㆍa) degrees, m being an integer equal to or greater than 0, and a being an integer equal to or greater than 1, second n armature coil or coils for the phase A wound in a reverse direction to that of said first armature coil or coils for the phase A on one or ones of said stator poles formed at a position or positions circumferentially spaced by an angular distance equal to an electrical angle of about nㆍ(360ㆍb-240) degrees, b being an integer equal to or greater than 1, from the stator pole or poles on which said first armature coil or coils for the phase A are wound, third n armature coil or coils for the phase A′wound in the reverse direction to that of said first armature coil or coils for the phase A on one or ones of said stator poles formed at a position or positions circumferentially spaced by an angular distance equal to an electrical angle of about nㆍ(360ㆍb-240) degrees from the stator pole or poles on which said first armature coil or coils are wound, fourth n armature coil or coils for the phase A′wound in the same winding direction as said first armature coil or coils for the phase A on one or ones of said stator poles formed at a position or positions circumferentially spaced by an angular distance equal to an electrical angle of about nㆍ(360ㆍc-120) degrees, c being an integer equal to or greater than 1, from the stator pole or poles on which said first armature coil or coils for the phase A are wound, fifth n armature coil or coils for the phase B wound in the same winding direction as said first armature coil or coils for the phase A on one or ones of said stator poles formed at a position or positions circumferentially spaced by an angular distance equal to an electrical angle of about nㆍ(360ㆍ d-180) degrees, d being an integer equal to or greater than 1, from the stator pole or poles on which said first armature coil or coils for the phase A are wound, sixth n armature coil or coils for the phase B wound in the reverse direction to that of first armature coil or coils for the phase A on one or ones of said stator poles formed at a position or positions circumferentially spaced by an angular distance equal to an electrical angle of about nㆍ(360ㆍe-60) degrees, e being an integer equal to or greater than 1, from the stator pole or poles on which said first armature coil or coils for the phase A are wound, seventh n armature coil or coils for the phase B′wound in the reverse direction to that of said first armature coil or coils for the phase A on one or ones of said stator poles formed at a position or positions circumferentially spaced by an angular distance equal to an electrical angle of about nㆍ(360ㆍf-180) degrees, f being an integer equal to or greater than 1, from the stator pole or poles on which said third armature coil or coils for the phase A′are wound, and eighth n armature coil or coils for the phase B′wound in the same winding direction as said first armature coil or coils for the phase A on one or ones of said stator poles formed at a position or positions circumferentially spaced by an angular distance equal to an electrical angle of about nㆍ(360ㆍg-180) degrees, g being an integer equal to or greater than 1, from the stator pole or poles on which said third armature coil or coils for the phase A′are wound, and an electric circuit for detecting the position of said field magnet to energize the armature coils for the phases A and A′and the armature coils for the phases B and B′alternately at an electric angle of about 180 degrees.