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Permanent-magnet rotary dynamo and compressor using same

A technology of rotating electrical machines and permanent magnets, which is applied to synchronous motors with stationary armatures and rotating magnets, magnetic circuit rotating parts, magnetic circuit shape/style/structure, etc., which can solve the problem of output power reduction and magnetic torque reduction And other issues

Inactive Publication Date: 2003-12-24
HITACHI LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, simply expanding the gap to reduce the gap flux density will reduce the magnetic flux generated by the permanent magnet due to the increase in reluctance, so the magnetic torque will decrease and the output power will decrease.

Method used

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  • Permanent-magnet rotary dynamo and compressor using same
  • Permanent-magnet rotary dynamo and compressor using same
  • Permanent-magnet rotary dynamo and compressor using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] figure 1 Shown is the radial cross-sectional shape of the permanent magnet type rotating electrical machine according to Embodiment 1 of the present invention. In the drawing, a permanent magnet type rotating electrical machine 11 is composed of a stator 7 and a rotor 1 . The stator 7 has a stator core 12 composed of teeth 10 and a core back 8, and an armature winding 9 of a concentrated winding around the teeth 10 in a slot 13 between the teeth 10 (the three-phase winding consists of a U-phase winding 9a , V-phase winding 9b, W-phase winding composition). Here, since the permanent magnet type rotating electrical machine 11 has 4 poles and 6 slots, the electrical angle of the slot pitch is 120 degrees.

[0029] figure 2 It is an enlarged radial cross-sectional shape diagram of the rotor using Embodiment 1 of the present invention. The rotor 1 is composed of a permanent magnet 3 inserted into a straight permanent magnet insertion hole 14 formed in the rotor core 2, ...

Embodiment 2

[0037] image 3 and Figure 4 It is a cross-sectional view showing an enlarged radial cross-sectional shape of the rotor according to Embodiment 2 of the permanent magnet type rotating electric machine of the present invention. in about image 3 and Figure 4 Example 2, with figure 2 The difference of the first embodiment is that the gap portion 4 is provided in the magnetic pole portion of the rotor core 2 . In addition, in image 3 , the magnetic pole portion of the rotor 1 is symmetrically provided with two gaps 4 with respect to the d-axis, and in Figure 4 There is one gap portion 4 on the d-axis.

[0038] Figure 12 It is a characteristic diagram showing the angle θ2 with respect to the gap between the magnetic pole portions of the rotor of the permanent magnet type rotating electric machine. The axis of abscissa is the angle θ2 between the gaps 4 expressed in electrical angle, and the axis of ordinate is the motor ( Figure 10 ) of the induced electromotive fo...

Embodiment 3

[0041] Figure 5 It is a cross-sectional view showing an enlarged radial cross-sectional shape of the rotor 1 according to Embodiment 3 of the permanent magnet type rotating electric machine of the present invention. Figure 5 Example 3 with figure 2 The difference of Embodiment 1 is that the shape of the permanent magnet 3 is formed into a V shape. This embodiment 3 and figure 2 Embodiment 1 can obtain the same effect.

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PUM

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Abstract

To provide a high output low noise permanent magnet type electric motor. The permanent magnet type electric motor 11 comprises a stator 7 having a concentrated armature winding 9 surrounding the tees 10 in a plurality of slots 13 formed in the stator core 12, and a rotor 1 having permanent magnets 3 contained in a plurality of permanent magnet insertion holes 14 formed in the rotor core 2. The pole angle [theta]1 of the rotor core is set in a range of electric angle of 100-120[deg] and a recess is formed in the outer circumferential surface of the rotor core between the poles thus ensuring a high output while reducing noise.

Description

technical field [0001] The present invention relates to a permanent magnet type rotating electrical machine in which a permanent magnet for a magnetic field is disposed in a rotor, and more particularly to a permanent magnet type rotating electrical machine installed in a compressor of an air conditioner, refrigerator, or freezer. Background technique [0002] Conventionally, such permanent magnet type rotating electric machines have been adopted in various shapes. For example, the permanent magnet type rotating electrical machine described in Japanese Unexamined Patent Application Publication No. 2001-218404 has a stator wound with an armature winding of a concentrated winding of a plurality of teeth formed on a stator core and an armature winding formed on a rotor core. A plurality of permanent magnets are inserted into the holes of the permanent magnet rotor, so that it can effectively generate magnetic torque, thereby increasing the output power of the rotating electrica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/24H02K1/16H02K1/27H02K21/14
Inventor 湧井真一菊地聪小原木春雄高畑良一野间启二
Owner HITACHI LTD