Permanent magnet type rotary electrical machine

A rotating electric machine, permanent magnet technology, applied in the field of permanent magnet electric rotating machine and its manufacturing, can solve the problems of output and efficiency reduction of permanent magnet electric rotating machine, achieve suppression increase, realize efficiency, and suppress increase of magnetizing current Effect

Active Publication Date: 2014-04-09
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is conceivable to design a design that reduces the magnetic flux of the permanent magnet to below the withstand voltage, but in this case, the output and efficiency of the permanent magnet rotating electrical machine in the low speed range decrease

Method used

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  • Permanent magnet type rotary electrical machine
  • Permanent magnet type rotary electrical machine
  • Permanent magnet type rotary electrical machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] (1-1) Structure

[0074] use figure 1 with 2 The first embodiment of the first invention will be described. figure 1 It is a cross-sectional view of the permanent magnet type rotating electrical machine of this embodiment in a direction orthogonal to the rotating shaft, and is a diagram showing the direction of magnetic flux during demagnetization, figure 2 It is a diagram showing the direction of magnetic flux during the same increase in magnetization.

[0075] Such as figure 1 As shown, the rotor 1 of Embodiment 1 of the first invention includes: a rotor core 2; a permanent magnet 3 (hereinafter referred to as a variable magnetic force magnet) having a small product of the coercive force and the thickness of the magnetization direction; and the coercive force and the magnetization direction Permanent magnets (hereinafter referred to as fixed magnetic magnets) 4 and 4 having a large product of thickness. The rotor core 2 is formed by laminating silicon steel sheets, and th...

Embodiment 2

[0103] In the second embodiment, the short-circuit coil 8 is provided parallel to the upper and lower surfaces (direction perpendicular to the magnetization direction) of the fixed magnetic magnet, but it can also be image 3 , 4 As shown, one is provided in the diagonal direction of the short-circuit coil, or two are provided in an X shape. That is, the fixed magnetic force magnet 4 is arranged in a direction that maintains a certain angle with respect to the magnetization direction of the fixed magnetic force magnet 4, and is arranged at the diagonal of the cross section in the direction orthogonal to the axial direction of the rotor of the fixed magnetic force magnet 4. At this time, the short-circuit coil 8 may be arranged in close contact with the fixed magnetic magnet 4. It is also possible to extend one end of the short-circuit coil 8 to the periphery of the variable magnetic force magnet 3, and the fixed magnetic force magnet 4 and the bridge 6 are included inside the sh...

Embodiment 3

[0108] The first invention is not limited to the above-mentioned embodiments, but also includes the following embodiment 3.

[0109] (1) In each of the above-mentioned embodiments, a 4-pole rotating electric machine is shown, but the first invention can of course be applied to a multi-pole rotating electric machine such as 8-pole. Depending on the number of poles, the arrangement position and shape of the permanent magnet will of course have some changes, but the same effect and effect can be obtained. In particular, in each of the above embodiments, a variable magnetic force magnet is arranged in the center and a fixed magnetic force magnet is arranged on both sides thereof, but other arrangements of variable magnetic force magnets and fixed magnetic force magnets may also be applied.

[0110] (2) In the rotor core 2 described above, the shape or position of the cavity provided to form a magnetic shield on the outer peripheral side of the fixed magnetic magnet, and the inner perip...

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PUM

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Abstract

According to one embodiment, a rotor is configured by a rotor core and magnetic poles Two or more types of permanent magnets are used such that each product of coercivity and thickness in the magnetization direction becomes different. A stator is located outside the rotor with air gap therebetween and configured by an armature core winding. At least one permanent magnet is magnetized by a magnetic field by a current of the armature winding to change a magnetic flux content thereof irreversibly. A short circuited coil is provided to surround a magnetic path portion of the other permanent magnet excluding the magnet changed irreversibly and a portion adjacent to the other permanent magnet where the magnetic flux leaks. A short-circuit current is generated in the short circuited coil by the magnetic flux generated by conducting a magnetization current to the winding. A magnetic field is generated by the short-circuit current.

Description

Technical field [0001] The present invention relates to a permanent magnet rotating electric machine with a short-circuit coil built in a rotor, and a manufacturing method thereof. The short-circuit coil generates an induced current by using the magnetic field during magnetization and demagnetization of the permanent magnet. Background technique [0002] In a permanent magnet type rotating electrical machine with permanent magnets built into the rotor, the interlinked magnetic flux of the permanent magnets is always generated at a certain intensity, so the induced voltage by the permanent magnets increases in proportion to the rotation speed. Therefore, when the variable speed operation is performed from a low speed to a high speed, the induced voltage (back voltage) by the permanent magnet during high-speed rotation becomes extremely high. When the induced voltage based on the permanent magnet is applied to the electronic component of the converter and becomes higher than its wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K21/14H02K1/22H02K1/27H02K15/03H02K15/08
CPCH02K1/223H02K15/03H02K1/02H02K1/2766H02K21/028Y10T29/49009Y10T29/49012
Inventor 桥场丰堺和人高桥则雄结城和明新政宪松冈佑将望月资康德增正
Owner KK TOSHIBA
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