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Permanent magnet synchronous motor and enclosed compressor

A permanent magnet and synchronous motor technology, applied to synchronous motors with stationary armature and rotating magnets, magnetic circuit shape/style/structure, magnetic circuit, etc., can solve the problem of ineffective use of permanent magnet flux and low efficiency and other problems, to achieve the effect of low noise, low vibration and vibration suppression

Active Publication Date: 2009-09-16
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the magnetic flux at the end of the permanent magnet cannot be effectively used, resulting in low efficiency

Method used

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  • Permanent magnet synchronous motor and enclosed compressor
  • Permanent magnet synchronous motor and enclosed compressor
  • Permanent magnet synchronous motor and enclosed compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0058] Figure 1 to Figure 3 is a diagram showing Embodiment 1, figure 1 is a cross-sectional view of the permanent magnet synchronous motor 100, figure 2 is a diagram showing part of the rotor 40 of the permanent magnet synchronous motor 100, image 3 It is a diagram showing part of the stator 30 and the rotor 40 of the permanent magnet synchronous motor 100 .

[0059] exist figure 1 Among them, the permanent magnet synchronous motor 100 includes a stator 30 and a rotor 40 . The stator 30 has a stator core 1 and a stator winding 4 . The stator core 1 is provided with nine slots 3 extending axially near the inner peripheral surface. The stator core 1 is formed by laminating a plurality of electromagnetic steel sheets with a thickness of about 0.1 to 1 mm. Nine magnetic pole teeth 2 are formed between adjacent slots 3 . The magnetic pole tooth portion 2 has a substantially parallel shape from the outer peripheral side to the inner peripheral side, and both the outer per...

Embodiment approach 2

[0083] Figure 4 It is a figure which shows Embodiment 2, and is a figure which shows part of the rotor core 5 of the permanent magnet synchronous motor 100. FIG.

[0084] exist Figure 4 Here, the core portion on the outer peripheral side of the slit 67 near the interpole portion is used as the outer peripheral thin-walled portion 9 . The core portion between the slit 67 and the magnet insertion hole 8 is used as the inner peripheral thin portion 11 . The core portion on the outer peripheral side of the magnet insertion hole 8 in the vicinity of the interpole portion serves as the interpole outer peripheral thin portion 10 .

[0085] In this embodiment, when the width dimension (radial dimension) of the outer peripheral thin-walled portion 9 is D1, and the width dimension (radial dimension) of the interpolar outer peripheral thin-walled portion 10 is D2, the configuration is such that D1< D2. In Embodiment 1, the case where the shape of the slit 67 in the vicinity of the ...

Embodiment approach 3

[0093] Figure 5 It is a figure which shows Embodiment 3, and is a longitudinal cross-sectional view of the rotary compressor 20 (an example of a hermetic compressor). exist Figure 5 Among them, a motor element 21 and a compression element 23 are accommodated in a hermetic container 22 of a rotary compressor 20 . The permanent magnet synchronous motor 100 shown in Embodiment 1 or Embodiment 2 is used for the electric element 21 .

[0094] The suction pipe 24 is connected to an evaporator (not shown) of the refrigeration cycle, and guides the refrigerant to the compression element 23 . The discharge pipe 25 is connected to the condenser of the refrigeration cycle, and sends the high-pressure refrigerant in the closed container 22 to the refrigeration cycle.

[0095] When the permanent magnet synchronous motor 100 shown in Embodiment 1 or Embodiment 2 is mounted on the rotary compressor 20, since the mounted permanent magnet synchronous motor 100 has high efficiency, a high-...

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Abstract

A high efficiency, low vibration and low noise permanent magnet synchronous motor. The invention is characterized in: the stator (30) comprises a stator core (1) having a magnetic pole tooth (2) formed between adjoining slots (3), and a stator winding (4) arranged in the slot (3) of the stator core (1), and the rotor (40) comprises a rotor core (5), a plurality of magnet insertion holes (8), permanent magnets (7) being inserted into the magnet insertion holes (8), and a plurality of slits (6) formed in the rotor core (5) on the outer circumferential side of the magnet insertion holes (8); a plurality of slits (6) in the vicinity of the magnetic pole center of the stator core (1) out of the slits (6) are arranged such that the magnetic flux generated from the permanent magnets (7) is directed in a direction to converge on the outside of the stator core (1), and the slits (6) in the vicinity of the interpole portion of the rotor core (5) are arranged to be directed in a direction different from that of the plurality of slits (6) in the vicinity of the magnetic pole center of the rotor core (5).

Description

technical field [0001] The present invention relates to a permanent magnet synchronous motor mainly mounted in a hermetic compressor or the like. Background technique [0002] A permanent magnet-embedded rotor has been proposed in which permanent magnets are embedded in a rotor where current phase control is difficult, and permanent magnets are embedded in a substantially cylindrical rotor core in the longitudinal direction in order to reduce torque ripple. The permanent magnet embedded type rotor has a plurality of slits extending from the vicinity of the rotor core outer peripheral side of the permanent magnets of each pole to the vicinity of the rotor surface (for example, refer to Patent Document 1). [0003] In addition, a permanent magnet motor has been proposed. In order to provide a highly efficient permanent magnet motor with less noise and vibration by reducing the armature reaction flux and improving the magnetic flux distribution of the outer peripheral core, the...

Claims

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Application Information

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IPC IPC(8): H02K21/16H02K1/27
CPCH02K1/276H02K2213/03H02K29/03H02K1/22H02K1/27
Inventor 吉野勇人滝田芳雄矢部浩二石垣隆士增本浩二
Owner MITSUBISHI ELECTRIC CORP
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