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permanent magnet synchronous motor

A technology of synchronous motors and permanent magnets, which is applied in the direction of magnetic circuit rotating parts, magnetic circuit shape/style/structure, etc., can solve the problems of permanent magnet material property degradation and achieve the effect of suppressing degradation

Active Publication Date: 2015-09-30
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the centrifugal force and inertial force are intensively received by the end portion of the permanent magnet on the side between the magnetic poles, which may lead to fracture of the permanent magnet and deterioration of material properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] figure 1 It is an overall view of the permanent magnet synchronous motor according to the first embodiment of the present invention. The permanent magnet synchronous motor is composed of a rotor 1 and a stator 30 . The rotor 1 has: a permanent magnet housing hole 4 protruding radially inward, a rotor core 2 positioned radially outside the permanent magnet housing hole 4 , and a permanent magnet housing hole 4 positioned on the side between the magnetic poles of the rotor core 2 The radially outer rib 6.

[0042] figure 2 is a partial sectional view of one pole of the permanent magnet synchronous motor in the first embodiment of the present invention. A permanent magnet 3 is arranged in the permanent magnet receiving hole 4 . The permanent magnet housing hole 4 is connected to the permanent magnet housing hole 4 of the adjacent pole by the connection part 11 . In addition, each pole of the permanent magnet 3 has at least two bending points 42 in the circumferential...

Embodiment 2

[0069] Figure 5 It is a partial cross-sectional view showing one pole of a permanent magnet synchronous motor according to a second embodiment of the present invention. The length W1 of the central portion 40 in the direction perpendicular to the magnetization direction of the central portion 40 is longer than the length W2 of the side portion 41 in the direction perpendicular to the magnetization direction of the side portion 41 . According to this configuration, the inertial force acting on the permanent magnet 3 in the rotational direction can be reduced.

[0070] For the above principle, use Image 6 Detailed description. When rotor 1 is in an emergency stop or out of adjustment, such as Image 6 As shown, an inertial force 60 is exerted on the permanent magnet 3 as a force in the direction of rotation. At this time, the most concentrated part of the inertial force 60 is the contact point 45 between the bending point 42 and the rotor core 2, and the stress at the cont...

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Abstract

The invention provides a permanent magnet synchronous motor capable of preventing breakage of permanent magnets and a driving system using the permanent magnet synchronous motor. The permanent magnet synchronous motor comprises the permanent magnets protruding toward the inner side radially, magnet receiving holes used for holding the permanent magnets, rotor cores disposed on the radial outer sides of the magnet receiving holes, and ribs disposed on the magnetic pole sides of the rotor cores and on the radial outer sides of the magnetic receiving holes. Each permanent magnet comprises a central part and side parts on the two ends of the central part, the radial gap between the central part and the matched magnet receiving hole being narrower than the radial gap between the side parts and the ribs.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor. Background technique [0002] In a permanent magnet synchronous motor, an Interior Permanent Magnet (hereinafter referred to as "IPM") structure in which a permanent magnet is embedded in a rotor is widely used. The permanent magnet embedded in the permanent magnet synchronous motor of IPM structure starts to use the cheap and easily available ferrite magnet. [0003] However, the performance of permanent magnets is expressed by two physical quantities, remanent magnetic flux density and coercive force, and the remanent magnetic flux density and coercive force of ferrite magnets are about 1 / 3 of that of neodymium magnets. Therefore, when the currently widely used neodymium magnets are replaced with ferrite magnets, the performance is significantly lowered. [0004] Patent Document 1 discloses a permanent magnet embedded rotor in which a housing hole in which a permanent magnet is embedded...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/27
Inventor 高桥晓史丸山惠理涌井真一
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC