Single-phase blushless motor

A brushless motor, single-phase technology, applied in the direction of electric components, electromechanical devices, electrical components, etc., can solve the problem of torque ripple reduction, to achieve the reduction of phase difference suppression, vibration and noise suppression, vibration and noise suppression Effect

Active Publication Date: 2006-12-20
MITSUMI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Then, there arises the following technical problem to be solved: reduce the torque ripple by suppressing the reduction of the phase difference between the generating torque and the braking torque, which is a cause of vibration and noise, and the present invention aims at solving this problem.

Method used

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Examples

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Embodiment

[0059] figure 1 is an external view of a single-phase brushless motor shown as the first embodiment of the present invention, figure 2 yes figure 1 An exploded perspective view of the single-phase brushless motor shown. Figure 3-Figure 5 Indicates the details of its various parts. In addition, although the illustrated form is applied to an outer rotor type brushless motor for air cooling of electronic equipment, the present invention is of course not limited thereto.

[0060] figure 1 and figure 2 The illustrated single-phase brushless motor 11 has an outer rotor shape, and is a single-phase brushless motor having a shape of 6 magnetic poles and 6 salient poles. The single-phase brushless motor 11 includes a stator 14 attached to a housing 13 fixed via a base plate 12 on the device (not shown) side, and a rotor 15 driven to rotate with respect to the stator 14 . In addition, on the substrate 12 are mounted a driver IC 16 incorporating a circuit for driving the moto...

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Abstract

The present invention can suppress the reduction of the phase difference between the generating torque and the braking torque, which causes vibration and noise, and can reduce torque ripple. A single-phase brushless motor is provided with a stator (14) in which a coil (27) is wound on a salient pole tooth (26) of a stator core (23), and there is a gap in the radial direction between the stator core (14) And it has a rotor (15) with ring-shaped permanent magnets (21) arranged oppositely. Make the distance from the center of the stator core (23) to the tooth end surface (30) of the salient pole tooth (26) differ between the two ends of the rotation direction of the salient pole tooth (26) so that the size of the gap is between the salient pole teeth ( 26) There is a gap between both ends of the rotation direction. The relationship between the minimum gap length (d1) and the maximum gap length (d2) between both ends of the salient pole teeth (26) in the direction of rotation is from d1:d2=1:2 to d1:d2=1:3.

Description

technical field [0001] The invention relates to a single-phase brushless motor, in particular to a single-phase brushless motor capable of reducing the cogging torque through the interaction of the stator iron core and the permanent magnet of the rotor. Background technique [0002] General brushless motors not only have high torque and excellent controllability, which are characteristics of DC motors, but also have high reliability, so they are widely used in industrial fields. Among them, single-phase type and three-phase type brushless motors are particularly widely used. [0003] In particular, three-phase brushless motors need to be energized with three-phase alternating currents whose phases are different from each other by 120° in electrical angle. Therefore, three magnetic sensors and a drive circuit using the magnetic sensors and having a three-phase switching function for switching coil energization are required. Therefore, for example, a motor for air cooling is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/14H02K29/00H02K5/24
Inventor 高桥勇树稻本繁典清原纯一镰仓吉克
Owner MITSUMI ELECTRIC CO LTD
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