Single-phase induction motor and method for reducing noise in the same
First Claim
1. A method for reducing noise in a single-phase induction motor having a main-winding and an auxiliary-winding, the method comprising:
- maintaining a phase angle difference of the main winding and the auxiliary winding between 70 and 110 degrees; and
maintaining an ampere turn ratio of the auxiliary-winding to the main-winding between 0.65 and 1.35,wherein the ampere turn ratio is a ratio of the auxiliary-winding magnetomotive force to the main-winding magnetomotive force.
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Abstract
A single-phase induction motor and a method for reducing noise in the same, which can eliminate unbalance between magnetomotive forces of main and auxiliary windings in a stator of the motor, thereby implementing a low noise, low vibration motor, and can also achieve balance between the magnetomotive forces of the stator windings in the entire running range of the motor, and can further achieve balance between the magnetomotive forces of the stator windings on the basis of temperature increase of the motor as it runs. The amplitude of a main-winding current flowing through the main winding in the stator is controlled to be equal to the amplitude of an auxiliary-winding current flowing through the auxiliary winding in the stator, and the phase difference between the main-winding and auxiliary-winding currents is controlled to be maintained at a predetermined value.
88 Citations
10 Claims
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1. A method for reducing noise in a single-phase induction motor having a main-winding and an auxiliary-winding, the method comprising:
- maintaining a phase angle difference of the main winding and the auxiliary winding between 70 and 110 degrees; and
maintaining an ampere turn ratio of the auxiliary-winding to the main-winding between 0.65 and 1.35, wherein the ampere turn ratio is a ratio of the auxiliary-winding magnetomotive force to the main-winding magnetomotive force. - View Dependent Claims (2, 3, 4, 5, 6)
- maintaining a phase angle difference of the main winding and the auxiliary winding between 70 and 110 degrees; and
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7. A single-phase induction motor comprising:
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a main winding in a stator; and an auxiliary winding in the stator, the auxiliary winding being connected in parallel with the main winding, wherein a phase difference between a main-winding current flowing through the main winding and an auxiliary-winding current flowing through the auxiliary winding is maintained between 70 and 110 degrees, wherein a ratio of a main-winding magnetomotive force produced by the main winding and an auxiliary-winding magnetomotive force produced by the auxiliary winding is maintained between 0.65 and 1.35. - View Dependent Claims (8, 9, 10)
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Specification