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Permanent magnet-embedded motor and compressor

A permanent magnet and motor technology, applied in the field of compressors and permanent magnet embedded motors, can solve the problems of increased torque ripple and achieve the effect of reducing torque ripple and maintaining torque reduction

Active Publication Date: 2018-01-02
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, compared with an embedded permanent magnet motor that does not use reluctance torque, an embedded permanent magnet motor that utilizes high reluctance torque tends to cause ripples in the torque waveform, resulting in increased torque ripple. topic

Method used

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  • Permanent magnet-embedded motor and compressor
  • Permanent magnet-embedded motor and compressor
  • Permanent magnet-embedded motor and compressor

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Experimental program
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Effect test

Embodiment approach 1

[0026] figure 1 is a cross-sectional view showing the structure of the permanent magnet embedded motor according to the present embodiment, figure 2 It is a sectional view of the rotor core of this embodiment. As described later, figure 1 as well as figure 2 It is a figure which shows the cross-sectional structure of the 1st core block among the 1st and 2nd core blocks which comprise a rotor core.

[0027] An embedded permanent magnet motor 1 includes an annular stator 2 and a rotor 3 disposed radially inside of the stator 2 with a gap 4 interposed therebetween.

[0028] The stator 2 includes an annular stator core 5 and a coil 7 wound around a plurality of teeth 6 formed on the inner peripheral surface of the stator core 5 . The teeth 6 are arranged at equal intervals in the circumferential direction of the stator 2 and extend in the radial direction of the stator core 5 .

[0029] The winding 7 is distributedly wound. In distributed winding, the winding 7 is wound ac...

Embodiment approach 2

[0062] Figure 11 It is a figure which shows the structure of the air conditioner which concerns on this embodiment. The air conditioner 100 according to this embodiment includes an indoor unit 101 and an outdoor unit 102 connected to the indoor unit 101 . The outdoor unit 102 includes the compressor 103 according to this embodiment. The embedded permanent magnet motor 1 of the first embodiment is used for the compressor 103 . In addition, the permanent magnet embedded motor 1 includes Modifications 1 and 2 described in the first embodiment.

[0063] Energy-saving performance is required for the air conditioner 100, and high efficiency is required. Furthermore, in order to suppress the vibration and noise which generate|occur|produce from the air conditioner 100 below a reference value, it is necessary to reduce the vibration and noise which generate|occur|produce from the compressor 103. The embedded permanent magnet motor 1 according to Embodiment 1 can suppress torque r...

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PUM

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Abstract

A rotor 3 of a permanent-magnet-embedded motor is provided with an annular rotor core 10 in which a plurality of magnet insertion holes 13 are formed in the circumferential direction, and permanent magnets 11 inserted into the magnet insertion holes 13. The rotor core 10 is formed by alternatingly stacking, in the axial direction of the rotor core 10, core blocks 10a that do not have slits 15a, 15b between the magnet insertion holes 13 and the outer circumferential surface of the rotor core 10 and core blocks 10b that have slits 15a, 15b between the magnet insertion holes 13 and the outer circumferential surface of the rotor core 10. The slits 15a and ends 11a of the permanent magnets 11 are arranged in the radial direction and the slits 15b and ends 11b of the permanent magnets 11 are arranged in the radial direction.

Description

technical field [0001] The present invention relates to an embedded permanent magnet motor in which a permanent magnet is embedded in a rotor core, and a compressor including the embedded permanent magnet motor. Background technique [0002] In recent years, due to increased awareness of energy conservation, high-efficiency motors have been demanded, and many embedded permanent magnet motors have been proposed that achieve high efficiency by using rare-earth magnets with high residual magnetic flux density and high coercive force for the rotor. Furthermore, by employing a structure in which the permanent magnets are embedded in the rotor, not only the magnet torque but also the reluctance torque can be utilized, so that a high-efficiency motor can be constructed. The reluctance torque is proportional to the difference between the inductances of the d-axis and the q-axis. Therefore, in order to increase the reluctance torque, it is generally preferable to adopt a structure th...

Claims

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Application Information

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IPC IPC(8): H02K1/27
CPCH02K1/276H02K21/14H02K2213/03F25B31/02H02K1/02H02K1/148H02K29/03H02K2201/06
Inventor 石川淳史仁吾昌弘
Owner MITSUBISHI ELECTRIC CORP
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