Single phase permanent magnet motor
First Claim
Patent Images
1. A single phase permanent magnet motor comprising:
- a stator comprising a stator core and windings wound around the stator core, the stator core comprising a ring portion, a plurality of tooth bodies extending radially from the ring portion, and a pole shoe extending from a distal end to two circumferential sides of each tooth body, a slot formed between each two adjacent pole shoes;
wherein each pole shoe defines a positioning slot, a center of each positioning slot is offset from a center of symmetry of one adjacent tooth body so that a torque fluctuation of an output torque of the single phase permanent magnet motor during operation is less than 50%;
wherein a rotor is rotatable relative to the stator, and the rotor has a plurality of permanent magnetic poles cooperatively with the pole shoes for forming a symmetrical uneven air gap, a width of the slot is greater than zero and less than or equal to two times of a minimum thickness of the symmetrical uneven air gap; and
wherein the rotor comprises an outer circumferential surface of a rotor core defining a plurality of axially extending grooves, the plurality of permanent magnetic poles are arranged on the outer circumferential surface of the rotor core, each groove being located at a junction between two adjacent permanent magnetic poles to reduce magnetic leakage, the plurality of axially extending grooves being arranged to face the positioning slot.
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Abstract
A single phase permanent magnet motor includes a stator. The stator includes a stator core and windings. The stator core includes a ring portion, tooth bodies extending radially from the ring portion, and a pole shoe extending from a distal end to two circumferential sides of each tooth body. Each pole shoe defines a positioning slot. A center of each positioning slot is offset from a center of symmetry of one adjacent tooth body so that a torque fluctuation of an output torque of the single phase permanent magnet motor during operation is less than 50%. As a result, the motor vibration and noise are small.
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Citations
19 Claims
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1. A single phase permanent magnet motor comprising:
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a stator comprising a stator core and windings wound around the stator core, the stator core comprising a ring portion, a plurality of tooth bodies extending radially from the ring portion, and a pole shoe extending from a distal end to two circumferential sides of each tooth body, a slot formed between each two adjacent pole shoes; wherein each pole shoe defines a positioning slot, a center of each positioning slot is offset from a center of symmetry of one adjacent tooth body so that a torque fluctuation of an output torque of the single phase permanent magnet motor during operation is less than 50%; wherein a rotor is rotatable relative to the stator, and the rotor has a plurality of permanent magnetic poles cooperatively with the pole shoes for forming a symmetrical uneven air gap, a width of the slot is greater than zero and less than or equal to two times of a minimum thickness of the symmetrical uneven air gap; and wherein the rotor comprises an outer circumferential surface of a rotor core defining a plurality of axially extending grooves, the plurality of permanent magnetic poles are arranged on the outer circumferential surface of the rotor core, each groove being located at a junction between two adjacent permanent magnetic poles to reduce magnetic leakage, the plurality of axially extending grooves being arranged to face the positioning slot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A single phase permanent magnet motor comprising:
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a stator comprising a stator core and windings wound around the stator core, the stator core comprising a ring portion, a plurality of tooth bodies extending radially from the ring portion, and a pole shoe extending from a distal end to two circumferential sides of each tooth body, each pole shoe defining a positioning slot, a center of each positioning slot being offset from a center of symmetry of one adjacent tooth body by 40 to 50 degrees electric angle; and a rotor rotatable relative to the stator, the rotor comprising a plurality of permanent magnetic poles arranged along a circumferential direction of the rotor, the permanent magnetic poles cooperatively with the pole shoes for forming a symmetrical uneven air gap, a slot is formed between each two adjacent pole shoes, a width of the slot is greater than zero and less than or equal to two times of a minimum thickness of the symmetrical uneven air gap; and the rotor comprising a plurality of axially extending grooves defined an outer circumferential surface of a rotor core, the plurality of permanent magnetic poles are arranged on the outer circumferential surface of the rotor core, each groove being located at a junction between two adjacent permanent magnetic poles to reduce magnetic leakage, the plurality of axially extending grooves being arranged to face the positioning slot. - View Dependent Claims (15, 16)
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17. A single phase permanent magnet motor comprising:
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a stator comprising a stator core and windings wound around the stator core, the stator core comprising a ring portion, a plurality of tooth bodies extending radially from the ring portion, and a pole shoe extending from a distal end to two circumferential sides of each tooth body, a slot formed between each two adjacent pole shoes; wherein each pole shoe defines a positioning slot, a center of each positioning slot is offset from a center of symmetry of one adjacent tooth body by an angle of 40 to 50 degrees electric angle so that a torque fluctuation of an output torque of the single phase permanent magnet motor during operation is less than 50%; wherein a rotor is rotatable relative to the stator, and the rotor has a plurality of permanent magnetic poles cooperatively with the pole shoes for forming a symmetrical uneven air gap; and wherein the rotor comprises an outer circumferential surface of a rotor core defining a plurality of axially extending grooves, the plurality of permanent magnetic poles are arranged on the outer circumferential surface of the rotor core, each groove being located at a junction between two adjacent permanent magnetic poles to reduce magnetic leakage, the plurality of axially extending grooves being arranged to face the positioning slot. - View Dependent Claims (18, 19)
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Specification