single phase motor

Abstract

To provide a single-phase motor capable of preventing generation of such a situation that a torque becomes zero at driving and thereby securing an initiation property while improving an output of a motor at high-speed rotation and suppressing torque ripples.SOLUTION: A single-phase motor comprises: a rotor 1 that has a permanent magnet; and a stator 3 that consists of a stator core 30 arranged at an outer periphery of the rotor 1 via an air gap from the rotor 1 and having a pair of tooth parts 33 opposed to the rotor 1, and a coil 34 equipped around the tooth parts. A tooth angle, which is a mechanical angle of an angle region facing the rotor outer periphery at front ends of the tooth parts 33, is equal to or more than 40° and equal to or less than 120°. An angle ratio R(=θ1 / θ) of a progressing side angle θ1, which is obtained by dividing the angle region into two at a reference position by using a circumferential position of the tooth parts that is set from a rotor phase at the time when a reverse induction voltage becomes zero as a reference position, and the tooth angle θ, is equal to or more than 0.51.SELECTED DRAWING: Figure 1

Description

technical field [0001] The present invention relates to a single-phase motor using a permanent magnet rotor. Background technique [0002] In a single-phase motor using a permanent magnet rotor, a pair of tooth portions are arranged to face each other across the rotor. Such a single-phase motor can be easily configured including a drive circuit and is relatively inexpensive, but there is a problem in starting performance in principle. Therefore, techniques for improving startability have been developed. For example, Patent Document 1 or the like discloses techniques for improving startability by eccentricizing the surface of the teeth facing the rotor or by providing recesses in the teeth. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent No. 3462043 Contents of the invention [0006] The problem to be solved by the invention [0007] However, in the above-mentioned single-phase motor, if the angle of the tooth portio...

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Problems solved by technology

[0008] On the other hand, if the tooth angle is reduced, contrary to the above, although the reduction in motor output during high-speed rotation is improved, the efficiency of the motor is reduced because the interlinkage flux with the permanent magnet rotor is reduced. In addition, the following occurs: Problem: Increased torque ripple that becomes a vibration factor of the motor during driving (power-on)

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