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Permanent magnet brushless motor with sinusoidal air gap flux density

An air-gap magnetic density, permanent magnet brushless technology, applied in the direction of electrical components, electromechanical devices, etc., can solve problems such as complex process, and achieve the effect of small speed torque fluctuation and good low-speed performance

Active Publication Date: 2012-11-21
中国航天科技集团公司第四研究院四0一所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Traditional motors have large torque fluctuations due to structural reasons. Although helical teeth or oblique poles can be used to weaken torque fluctuations, the process is relatively complicated.

Method used

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  • Permanent magnet brushless motor with sinusoidal air gap flux density
  • Permanent magnet brushless motor with sinusoidal air gap flux density
  • Permanent magnet brushless motor with sinusoidal air gap flux density

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Experimental program
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Embodiment Construction

[0023] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0024] This embodiment adopts the magnetic pole design method of surface-mounted eccentricity, so that the circular arc of the outer surface of the permanent magnet has a different center from the inner circle of the stator core, and the permanent magnet is magnetized in parallel. After a reasonable design of the eccentricity, a sinusoidal flux density waveform can be generated in the air gap.

[0025] This embodiment includes a stator core 1, a permanent magnet 2, a rotor core 3 and a rotating shaft 4; wherein: R is the inner surface radius of the stator core, which is equal to 15.75 mm; T is the outer arc radius of the permanent magnet, which is equal to 13.47 mm; H is the stator core The eccentric distance between the inner surface and the outer arc of the permanent magnet is equal to 1.78mm; B is the width of the permanent magnet, equal to 20.75mm; M is the m...

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Abstract

The invention relates to a permanent magnet brushless motor with sinusoidal air gap density, which comprises a stator iron core (1), a permanent magnet (2), a rotor iron core (3) and a rotating shaft (4), and is characterized in that the relationship of the stator iron core and the permanent magnet is expressed as H=R-T-m, wherein R is the radius of the internal surface of the stator iron core; Tis the radium of the external circular arc of the permanent magnet; H is the eccentricity between the internal surface of the stator iron core and the external circular arc of the permanent magnet; Bis the width of the permanent magnet; M is the maximum length of the air gap; and m is the minimum length of the air gap. The permanent magnet brushless motor has the greatest advantage of low-speed performance compared with the prior art. During low-speed operation, the fluctuation in rotation speed and torque is small.

Description

technical field [0001] The invention relates to a permanent magnet brushless motor with sinusoidal air gap flux density, belongs to the technical field of rotating electrical machines, relates to permanent magnet motors, and more specifically relates to the realization of a permanent magnet brushless motor sinusoidal air gap flux density method. Background technique [0002] A rotating electrical machine acts as an energy conversion device to convert input electrical energy into mechanical energy. [0003] The brushless motor consists of three parts: the motor body, the position sensor, and the drive circuit. According to the different functions it completes, it is divided into two categories: speed servo system and position servo system. In the permanent magnet motor system, due to the interaction between the permanent magnet and the slotted armature core, cogging torque is inevitably generated, resulting in torque fluctuation, causing vibration and noise, and affecting t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K29/03
Inventor 黄斌郗珂庆
Owner 中国航天科技集团公司第四研究院四0一所