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Field piece

A technology of excitation system and magnetic body, applied in the direction of magnetic circuit, magnetic circuit rotating parts, magnetic circuit shape/style/structure, etc. effect of noise

Inactive Publication Date: 2010-01-06
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the technique described in Patent Document 1, since the rotor has different shapes for each pole, the rotational force becomes unbalanced, which becomes a cause of induced vibration.

Method used

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no. 1 Embodiment approach

[0059] The excitation system of the first embodiment of the present invention will be described. figure 1 It is a schematic perspective view obtained by decomposing the excitation system along the rotation axis P. figure 1 The excitation system shown is a so-called axial-gap excitation system.

[0060] The excitation system has permanent magnets 20 and magnetic plates 1 , 3 .

[0061] The permanent magnet 20 is magnetized in a direction parallel to the rotation axis P (hereinafter referred to as the rotation axis direction). The permanent magnet 20 is arranged in a ring shape, and its magnetization direction is alternately changed around the rotation axis P. As shown in FIG. exist figure 1 A so-called 4-pole excitation system configured with four permanent magnets 20 is exemplified in .

[0062] The magnetic plates 1 and 3 have, for example, an annular flat plate shape centered on the rotation axis P. As shown in FIG. Magnetic body 1,3 and permanent magnet 20 are in figu...

no. 2 Embodiment approach

[0101] An excitation system according to a second embodiment of the present invention will be described by describing differences from the first embodiment. Figure 8 is a schematic bottom view of the excitation system. Figure 9 yes Figure 8 A cross-sectional view of the shown excitation system in the circumferential direction, at the positions where the non-magnetic bodies 11 and 13 are located. exist Figure 8 , 9 A part corresponding to one permanent magnet 20 is shown in .

[0102] The nonmagnetic body 11 has nonmagnetic body parts 11a and 11b, and the nonmagnetic body 13 has nonmagnetic body parts 13a and 13b. The nonmagnetic body 31 has nonmagnetic body parts 31a, 31b, and the nonmagnetic body 33 has nonmagnetic body parts 33a, 33b. Next, first, the case where the magnetic plates 1 and 3 have the same shape as each other will be described.

[0103]The non-magnetic body portion 11a is, for example, an air layer. The non-magnetic body portion 11b is, for example, ...

no. 3 Embodiment approach

[0131] An excitation system according to a third embodiment of the present invention will be described by describing differences from the second embodiment. Figure 10 The part corresponding to one permanent magnet 20 in the bottom view of this excitation system is shown. in addition, Figure 10 The schematic cross-sectional view of the circumferential direction of the shown excitation system, the position where the non-magnetic bodies 11, 13 are located and image 3 Much the same.

[0132] The lengths of the non-magnetic body parts 11a and 11b in the radial direction (hereinafter simply referred to as lengths) are different from each other. Specifically, the length of the nonmagnetic body part 11b is shorter than the length of the nonmagnetic body part 11a. In addition, the thicknesses of the non-magnetic body parts 11a and 11b are the same as each other.

[0133] The lengths of the non-magnetic body parts 13a and 13b are different from each other. Specifically, the leng...

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Abstract

This invention is directed to a field piece to reduce harmonic components of magnetic flux density. A permanent magnet (20) is in contacts with a first magnetic plate (1, 3) in a direction in parallel with a rotation axis (P). The first magnetic plate (1) is provided with first and second magnetic members (10, 12) and first and second non-magnetic members (11, 13). The first magnetic member (10) includes the pole center and is in contact with one permanent magnet in the rotation axis direction. The first magnet member (10), the first non-magnetic members (11), the second magnetic member (12) and the second non-magnetic member (13) are disposed in this order in a circumferential direction starting from the pole center as a start point and centering the rotation axis. If a pole logarithm (Pn) and a not less than three odd number (i) are given, an angle (theta 1) defined by an edge (131) of the second non-magnetic member (13) on the pole center side with respect to a pole gap is 0<theta 1<180 / (i Pn). Similarly, an angle (theta 2) defined by an edge (111) of the second non-magnetic member (11) on the pole center side with respect to a pole gap is 180 / (i Pn)<=theta 2<=180 2 / (i Pn).

Description

technical field [0001] The present invention relates to excitation systems, for example to axial-gap excitation systems. Background technique [0002] Patent Document 1 discloses a radial rotor in which a plurality of permanent magnets are embedded in a circumferential direction around a rotating shaft. In this rotor, gaps are provided at both ends of the permanent magnets in the circumferential direction. The cogging torque is reduced by varying the angle formed by the ends of these gaps near the center of the pole relative to the axis of rotation for each pole. [0003] In addition, Patent Documents 2 to 4 disclose techniques related to the present invention. [0004] Patent Document 1: Japanese Patent Application Laid-Open No. 11-98731 [0005] Patent Document 2: Japanese Unexamined Patent Publication No. H10-201147 [0006] Patent Document 3: Japanese Patent Laid-Open No. 2000-69695 [0007] Patent Document 4: Japanese Patent Laid-Open No. 2002-44888 [0008] Howev...

Claims

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Application Information

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IPC IPC(8): H02K1/22
CPCH02K1/2793H02K1/2795H02K1/182H02K1/02H02K2213/03H02K21/24H02K29/03
Inventor 青田桂治浅野能成
Owner DAIKIN IND LTD
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