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Permanent magnet-embedded electric motor

一种永磁体、电动机的技术，应用在电动组件、磁路转动零部件、磁路等方向，能够解决价格不菲、电动机成本增加等问题，达到增强减磁耐力、增加输出功率的效果

Active Publication Date: 2015-05-27
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rare-earth permanent magnets are expensive and increase the cost of the motor. Therefore, sintered ferrite magnets are used instead of rare-earth permanent magnets in the rotor of conventional permanent magnet embedded motors.

Method used

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Experimental program
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Embodiment approach 1

[0026] figure 1 It is a cross-sectional view of the embedded permanent magnet motor according to Embodiment 1 of the present invention, and in detail, it is a diagram showing a cross-section perpendicular to the rotation axis of the rotor. also, figure 2 yes means figure 1 A cross-sectional view of the rotor core shown in a state where no permanent magnets are placed in the magnet accommodation holes. image 3 yes means figure 2 A partial enlarged view of the dimensional characteristics of the magnet housing hole, figure 2 is in figure 2 A cross-sectional view of the rotor in the state after placing the permanent magnets in the magnet accommodation holes in Figure 5 It is a figure which shows an example of the magnetic field orientation of a permanent magnet.

[0027] exist figure 1 Among them, the permanent magnet embedded motor 1 according to Embodiment 1 includes a stator 3 and a rotor 5 . The stator 3 includes a ring-shaped stator core 7 , a plurality of teeth...

Embodiment approach 2

[0046] Next, refer to Figure 6 and Figure 7 Embodiment 2 of the present invention will be described. In addition, this Embodiment 2 is comprised similarly to the said Embodiment 1 except the part demonstrated below. Figure 6 is the embodiment 2 with Figure 4 a graph of the same state, Figure 7 yes means Figure 6 A local enlarged view of the dimensional characteristics of the magnet housing hole.

[0047] Such as Figure 6 and Figure 7 As shown, the radius of curvature (the radius of the arc on the center side of the rotor core 19 ) of the concave outer side of the magnet housing hole 121 in the second embodiment is defined as R1, and the magnet housing hole 121 The radius of curvature (the radius of the circular arc on the outer peripheral side of the rotor core 19) of the inner side of the delineated arc is R2, and the circular arc on the outer peripheral side of the rotor core 19 in the circular arc delimiting the permanent magnet 23 When the radius is R3, the...

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PUM

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Abstract

A permanent magnet-embedded electric motor (1) wherein it is possible to increase the output of the motor without the torque declining by strengthening demagnetization resistance. The permanent magnet-embedded electric motor (1) is provided with a stator (3), and a rotor (5) having a rotor core (19), wherein the rotor core contains multiple magnet housing holes (21) and multiple permanent magnets (23), the thickness of the magnet housing holes in the short direction is smallest at the center part of the magnetic pole and becomes gradually larger towards the outside of the rotor core in the radial direction, and at least the thickness of the permanent magnets at the center part of the magnetic pole in the short direction is the same as the thickness of the magnetic housing holes at the center part of the magnetic pole in the short direction.

Description

technical field [0001] The present invention relates to an embedded permanent magnet motor in which permanent magnets are embedded in a rotor core. Background technique [0002] In recent years, many permanent magnet motors have been proposed in which high efficiency is achieved by using a rare-earth permanent magnet having a high coercive force for a rotor due to increased awareness of energy saving. However, rare-earth permanent magnets are expensive and increase the cost of the motor. Therefore, sintered ferrite magnets are used instead of rare-earth permanent magnets for rotors of conventional embedded permanent magnet motors. When a sintered ferrite magnet is used instead of a rare earth permanent magnet in this way, the residual magnetic flux density indicating the magnitude of the magnetic force is reduced to about 1 / 3. In order to compensate for the lack of torque due to the drop in magnetic force, it is necessary to arrange sintered ferrite magnets with as large a ...

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 马场和彦仁吾昌弘土田和庆
Owner MITSUBISHI ELECTRIC CORP