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Premanent magnet electric machine

A permanent magnet motor, permanent magnet technology, applied in the field of permanent magnet motors

Inactive Publication Date: 2002-11-13
JAPAN SERVO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] As a result, the interconnect flux increases by 40%, however, the first solution is not a good solution due to the cogging torque increase of about 8 times

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0058] The permanent magnet motor according to the present invention includes a stator core 1 and a permanent magnet rotor 4 facing the stator core 1 with a gap therebetween. The stator core 1 includes a cylindrical stator frame, a plurality of stator poles 2 extending radially from the peripheral surface of the stator frame, s small stator teeth 3 formed on the distal end of each pole 2, and wound around the stator poles. of the field winding.

[0059] The rotor 4 includes a cylindrical permanent magnet 5 having p pieces of N poles and p pieces of S poles arranged alternately at equal intervals along its peripheral surface.

[0060] The pitch of the small stator teeth 3 is 1±1 (2 ms) times larger than the pitch of the rotor magnetic pole pairs. Here, m is the number of phases of the permanent magnet motor of the present invention.

[0061] In another embodiment of the present invention, the pitch of the small stator teeth is (1±1 / 6s) times larger than the pitch of the rotor...

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Abstract

A permanent magnet motor comprising a stator and a permanent magnet rotor facing the stator with a gap therebetween; the stator has a plurality of stators extending radially toward the peripheral surface of the rotor Magnetic poles, s small stator teeth formed on the ends of each stator pole, and m-phase field windings wound around the stator poles; the rotor has cylindrical permanent magnets with equal spacing along its circumference The N pole pieces and the S pole pieces are staggered, wherein the spacing of the small stator teeth is 1±1 / (2ms) times larger than the spacing of the rotor pole pairs. The width of the small stator teeth is 37% to 47% of the pole pitch. The depth of the slot formed between the adjacent small stator teeth is more than 15 times greater than the length of the air gap between the stator core and the rotor.

Description

technical field [0001] The invention relates to a permanent magnet motor, especially a motor with a permanent ring magnet rotor, which can reduce the cogging torque and increase the magnetic flux. Background technique [0002] A conventional three-phase hybrid stepper motor with a permanent ring magnet rotor is disclosed in Japanese Patent Application Laid-Open No. 14514 / 94 and Japanese Patent Application Laid-Open No. 131968 / 95. [0003] However, for this kind of three-phase stepping motor, there is no effective way to reduce the cogging torque and increase the magnetic flux. [0004] From a two-dimensional analysis of the magnetic field associated with a conventional three-phase hybrid stepper motor with a permanent magnet ring magnet rotor, an unexpected magnetic flux flow was observed and the morphology of the poles was found to be modifiable. [0005] figure 1 Shows the structure of a permanent magnet type stepper motor of the previous design style. The stepping moto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K37/04H02K1/14H02K37/14
CPCH02K1/146H02K37/14
Inventor 大西和夫坂本正文菊地范芳
Owner JAPAN SERVO CO LTD