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Motor and compressor

A motor and rotor technology, applied in the field of compressors, can solve the problems of motor efficiency reduction, magnet heating, etc., and achieve the effect of increasing manufacturing costs

Pending Publication Date: 2020-03-10
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The efficiency of the motor is reduced because the eddy currents become losses
In addition, the generation of eddy current causes the magnet to generate heat, so it becomes the main cause of demagnetization

Method used

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  • Motor and compressor
  • Motor and compressor
  • Motor and compressor

Examples

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Embodiment Construction

[0069] Next, a motor according to an embodiment of the present invention will be described with reference to the drawings. The embodiments shown below are merely examples, and application of various modifications and techniques not explicitly described in the following embodiments is not excluded. In addition, each structure of embodiment can be implemented with various modifications in the range which does not deviate from these gist. Furthermore, each configuration of the embodiment can be selected according to need, or can be combined appropriately.

[0070] Hereinafter, a case where the compressor is a scroll compressor will be described as an example, but the type of compressor is not limited to the scroll compressor.

[0071] In addition, in all the drawings for describing the embodiment and its modifications, in principle, the same elements are denoted by the same reference numerals, and description thereof may be omitted.

[0072] [1. Structure of the compressor]

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Abstract

The invention provides a motor and a compressor, which can improve the efficiency and demagnetization endurance of the motor without increasing the manufacturing cost. The motor includes: a stator; arotor opposed to the stator with a gap therebetween; a permanent magnet embedded in the rotor to form a predetermined magnetic pole. Recesses are formed in the q-axis on the outer peripheral surface of the rotor. The shortest gap length among the gap lengths between the stator and the rotor is set as a first gap length g1. A second gap length g2 is defined as the gap length at the intersection point of the recesses and a straight line passing through the rotation center of the rotor and the end of the permanent magnet on the outer peripheral side of the rotor and on the d-axis side among the gap lengths. When the distance between the two ends of the permanent magnet on the outer peripheral side and the d-axis side of the rotor is set to be a first width dimension W1 and the interval between the adjacent recesses is set to be a second width dimension W2, the following formulae 1 and 2 are satisfied: g2 / g1 >= 2.5 (1) and W1 > = W2 (2).

Description

technical field [0001] The present invention relates to a motor in which a permanent magnet is embedded in a rotor, and a compressor using the motor. Background technique [0002] Conventionally, various electric motors have been developed in which permanent magnets (hereinafter also simply referred to as “magnets”) are embedded in a rotor to increase output torque and achieve high efficiency. [0003] In this type of motor, eddy currents are sometimes generated inside the magnets due to changes in the magnetic flux passing through the magnets. Since the eddy current becomes a loss, the efficiency of the motor is reduced. In addition, the generation of eddy currents generates heat in the magnets, which is a major cause of demagnetization. [0004] Patent Document 1 discloses a motor in which a slit is provided at a position close to a magnet on the outer periphery of a rotor. Eddy currents are likely to be generated near the outer periphery of the magnet, and if slits are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27
CPCH02K1/2766H02K2213/03
Inventor 芦森丈明新井和彦长瀬好彦
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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