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Brushless motor and air blowing device

A motor and magnet technology, which is applied in the fields of brushless motors and air supply devices, can solve the problems of less emphasis on the improvement of the output efficiency of the torque characteristics of the brushless motor, and the improvement of the torque characteristics.

Active Publication Date: 2019-06-04
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, Japanese Laid-Open Publication No. 2003-61326 gives priority to reducing the cogging torque, so it does not pay much attention to the improvement of the torque characteristics of the brushless motor and the improvement of the output efficiency, so no improvement of the torque characteristics is made. and a design that prioritizes output efficiency

Method used

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  • Brushless motor and air blowing device
  • Brushless motor and air blowing device
  • Brushless motor and air blowing device

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Embodiment Construction

[0020] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings.

[0021] First, in this specification, the rotation axis of the motor 110 of the ceiling fan 100 is referred to as a central axis CA, and the direction parallel to the central axis CA is referred to as an "axial direction". In addition, the direction from the stator core 21 toward one axial side of the bearing 3 is referred to as "axially upper side", and the direction from the bearing 3 toward the other axial side of the stator core 21 is referred to as "axially downward". side". Among the surfaces of the constituent elements, the surface facing upward in the axial direction is referred to as an "upper surface", and the surface facing axially downward is referred to as a "lower surface". In addition, among the respective constituent elements, the end portion on the axially upper side is referred to as an “upper end portion”, and the end portion on the axially ...

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Abstract

The invention provides a brushless motor and an air blowing device. The stator core of the brushless motor of the air blowing device comprises an iron core back that encloses a central axis in a circular shape; and a plurality of teeth that extend to the radial external side from the iron core back. Each tooth comprises a plurality of small teeth that are opposite to the rotor of the brushless motor and are arranged in the circumferential direction; and tooth recessed parts, which are recessed towards to the radial inner side of positions between neighbored small teeth. The circumferential length of the tooth recessed parts is 0.8 to 1.9 times of the circumferential length of the magnet of the rotor; or the radial length of the tooth recessed parts is 1.7 to 5.8 times of the radial lengthof the magnet.

Description

technical field [0001] The invention relates to a brushless motor and an air blower. Background technique [0002] Conventionally, a stepping motor having a stator core of a so-called vernier structure in which a plurality of small teeth are provided at the ends of salient poles is known. For example, in Japanese Laid-Open Publication No. 2003-61326, in order to reduce the cogging torque by applying the vernier structure to the brushless motor, the opening angle of the small teeth is set to 145°-160° electrical angle. [0003] However, Japanese Laid-Open Publication No. 2003-61326 gives priority to reducing the cogging torque, so it does not pay much attention to the improvement of the torque characteristics of the brushless motor and the improvement of the output efficiency, so no improvement for the improvement of the torque characteristics is made. And a design that gives priority to improving output efficiency. Contents of the invention [0004] In view of the above ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/22H02K7/14H02K1/14
Inventor 白石有贵延渡边裕介金泽佑树
Owner NIDEC CORP