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Permanent magnet rotating electric machine and compressor using same

A rotating motor and permanent magnet technology, which is applied in the field of compressors, can solve the problems of increasing the space high-order harmonic flux components, etc., and achieve the effect of preventing magnet damage and high-efficiency control

Active Publication Date: 2020-01-03
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase in output density due to miniaturization and high efficiency, the influence of the nonlinear magnetic characteristics (hysteresis) of the iron core becomes significant, and the use of concentrated coils increases the effect of the reluctance torque. Reduced, increased iron loss of space harmonic flux components

Method used

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  • Permanent magnet rotating electric machine and compressor using same
  • Permanent magnet rotating electric machine and compressor using same
  • Permanent magnet rotating electric machine and compressor using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 It is a cross-sectional view of the permanent magnet rotating electrical machine according to the first embodiment of the present invention. This cross-sectional view represents a cross-section perpendicular to the direction of the rotation axis (described later figure 2 , 6 also the same). Furthermore, Example 1 operates as a permanent magnet synchronous motor.

[0033] Such as figure 1 As shown, a permanent magnet rotating electrical machine 1 is composed of a stator 2 and a rotor 3 rotatably arranged on the outer peripheral side of the stator 2 with a predetermined gap (gap) interposed therebetween. A rotor support member (not shown) having a shaft fixing portion is provided on the rotor 3 . The stator 2 has stator cores 6 stacked in the axial direction, and includes an annular core support 5 and a plurality of teeth 4 protruding radially outward from the core support 5 . The plurality of teeth 4 are arranged at approximately equal intervals in the ci...

Embodiment 2

[0065] Figure 6 It is a cross-sectional view of the shape of the rotor core of the permanent magnet rotating electric machine according to the second embodiment of the present invention.

[0066] exist Figure 6 in, with figure 2 Symbols with the same reference symbols represent the same constituent elements or constituent elements having similar functions. Hereinafter, the points different from Example 1 will be mainly described.

[0067] This embodiment 2 and embodiment 1 ( figure 2 ) are different, each of the magnetic poles of the rotor 3 has two permanent magnets. In the case of using a permanent magnet as in Example 1, heat loss due to eddy currents becomes a problem. Furthermore, in the case of high-speed rotation, the frequency and fluctuation range of the fluctuating magnetic field applied to the magnet also increase, and the heat loss also increases accordingly. In order to reduce heat loss due to the eddy current, the permanent magnet 14 embedded in the per...

Embodiment 3

[0074] Next, regarding the example of applying the permanent magnet rotating electrical machines of Embodiments 1 and 2 to a scroll compressor, using Figure 7 Be explained. Figure 7 It is a cross-sectional view of a compressor according to Embodiment 3 of the present invention.

[0075] exist Figure 7 In the cylindrical compression container 69, a scroll cover plate 62 perpendicular to the end plate 61 of the fixed scroll member 60 and a scroll cover plate 65 perpendicular to the end plate 64 of the orbiting scroll member 63 are provided. In the meshing compression mechanism, the permanent magnet type rotating electric machine is used, and the orbiting scroll member 63 is rotated by the crankshaft 72 to perform a compression operation. Embodiment 1 or Embodiment 2 of the present invention is applied as this permanent magnet type rotating electric machine.

[0076] In addition, among the compression chambers 66 a to 66 b formed by the fixed scroll member 60 and the orbiti...

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Abstract

The purpose of the present invention is to provide a permanent magnet rotating electric machine capable of being highly efficiently controlled even in a high-speed region. In order to achieve this purpose, the present invention provides the following configuration. A rotor (3) disposed on the outer circumferential side of a stator is provided with: a plurality of permanent magnet insertion portions (13) extending in the circumferential direction of the rotor (3) and formed penetrating in the axial direction; and a plurality of plate-like permanent magnets (14) inserted into the permanent magnet insertion portions (13). The rotor (3) also has a recessed portion (11) formed between the permanent magnet insertion portions (13) adjacent in the circumferential direction and recessed toward theoutside in the radial direction from the inner circumferential surface of the rotor (3). When the line connecting between the rotational center of the rotor (3) and the center portion of the permanentmagnets (14) in the circumferential direction is defined as a d-axis and the axis orthogonal to the d-axis in electric angle is defined as a q-axis, the recessed portion (11) is positioned on the q-axis. Furthermore, a cutout portion (17) formed separated from the permanent magnet insertion portions (13) is provided between the permanent magnet insertion portions (13) adjacent in the circumferential direction and is positioned on the q-axis.

Description

technical field [0001] The present invention relates to a permanent magnet rotating electrical machine including a permanent magnet in a rotor, and a compressor using the permanent magnet rotating electrical machine. Background technique [0002] Permanent magnet rotary motors are suitable for various technical fields such as compressors in air conditioners, refrigerators, cold storage or food display cabinets. Conventionally, in permanent magnet rotating electrical machines, concentrated coils have been used for stator coils serving as armature coils, and high-flux-density permanent magnets such as rubidium magnets have been used for magnetic fields to achieve downsizing and high efficiency. However, with the increase in output density due to miniaturization and high efficiency, the influence of the nonlinear magnetic characteristics (hysteresis) of the iron core becomes significant, and the use of concentrated coils increases the effect of the reluctance torque. Reduced, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27H02K1/22H02K21/22
CPCH02K1/22H02K1/27H02K21/22F04C23/02F04C29/0085H02K2213/03F04C2240/40H02K29/03H02K1/2791H02K1/146H02K2201/03
Inventor 高畑良一初濑涉渕野大我新村修平松永和行田所哲也
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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