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Rotary electrical machine and vehicle

A technology for rotating electrical machines and rotors, applied in circuits, electrical components, electromechanical devices, etc., to solve problems such as inability to reduce magnetic flux density

Active Publication Date: 2017-01-25
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for permanent magnets with high magnetic flux density such as Nd-Fe-B type sintered magnets, the magnetic flux density cannot be sufficiently reduced during high-speed rotation

Method used

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  • Rotary electrical machine and vehicle
  • Rotary electrical machine and vehicle
  • Rotary electrical machine and vehicle

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0020] In this embodiment, an example of a permanent magnet that can be applied to a rotating electrical machine such as a motor or a generator for variable speed drive from low speed to high speed will be described. figure 1 It is a figure which shows the magnetic example of the permanent magnet of this embodiment, figure 2 It is a figure which shows the magnetic example of the permanent magnet of a comparative example. In addition, in figure 1 and figure 2 In , the horizontal axis represents the magnetic field H, and the vertical axis represents the magnetic flux density B or the magnetization M.

[0021] figure 1 The shown curve 1a shows the M-H curve of the permanent magnet of this embodiment, and the curve 1b shows the B-H curve of the permanent magnet of this embodiment. The permanent magnet of the present invention has high magnetization on the B-H curve. In addition, when the reverse magnetic field is applied by using the field weakening control method, the decr...

no. 2 approach

[0094] The permanent magnet of the first embodiment can be used in rotating electric machines such as various electric motors and generators. It can also be used as a fixed magnet or a variable magnet for motors with variable magnetic flux. By using the permanent magnet of the first embodiment, various motors can be configured. When the permanent magnet of the first embodiment is applied to a variable magnetic flux motor, for example, Japanese Patent Laid-Open No. 2008-29148 or Japanese Patent Laid-Open No. 2008- The technology disclosed in the No. 43172 bulletin.

[0095] Next, a motor including the permanent magnet described above will be described with reference to the drawings. Figure 6 It is a figure which shows the permanent magnet motor in this embodiment. Figure 6 In the permanent magnet motor 100 shown in , a rotor (rotator) 103 is arranged inside a stator (fixer) 102 . The permanent magnet 105 which is the permanent magnet of 1st Embodiment is arrange|positione...

Embodiment 1、 Embodiment 2

[0126] After weighing and mixing various raw materials used in the permanent magnet in a predetermined ratio, arc melting is performed in an Ar atmosphere to form an alloy ingot. After the alloy ingot was heat-treated by holding at 1160° C. for 19 hours, the alloy ingot was coarsely pulverized and pulverized by a jet mill to prepare alloy powder as magnet raw material powder. The obtained alloy powder is press-molded in a magnetic field to produce a compression-molded body.

[0127] Then, as shown in Table 2, oxidation treatment was performed by leaving the compression-molded body at a humidity of 30% and a temperature of 23° C. for 2.5 hours. Arrange the compression molded body of the alloy powder in the hearth of the sintering furnace, raise the temperature to 1175°C after making the hearth a vacuum state, keep at the reached temperature for 30 minutes, then introduce Ar gas, and raise the temperature to 1200°C in the Ar atmosphere , and sintering was carried out by keeping...

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Abstract

Decreasing of output power of a speed-variable driving rotary electrical machine from low-speed rotation to high-speed rotation is suppressed. A rotary electrical machine includes a permanent magnet having a composition containing at least one element selected from the group consisting of rare earth elements. A residual magnetization of the permanent magnet is 1.16 T or more. A coercive force Hcj on an M-H curve of the permanent magnet is 1000 kA / m or more. A recoil magnetic permeability on a B-H curve of the permanent magnet is 1.1 or more.

Description

[0001] This application is based on Japanese patent application 2015-140539 (application date: 7 / 14 / 2015) and Japanese patent application 2016-131871 (application date: 7 / 1 / 2016) and enjoys the priority of the above applications. This application incorporates by reference the aforementioned applications in their entirety. technical field [0002] The invention of the embodiment relates to a rotating electric machine and a vehicle. Background technique [0003] It is known to use rotating electric machines such as electric motors and generators equipped with Nd—Fe—B magnets in automobiles and railway vehicles to improve efficiency. Nd-Fe-B type magnets have high magnetic flux density. Therefore, high torque can be obtained by using Nd—Fe—B based sintered magnets for rotating electrical machines. [0004] The electric motors for automobiles or railway vehicles described above perform variable-speed drive from low-speed rotation to high-speed rotation. At this time, the conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/02H01F7/02H01F1/055
CPCH02K1/02H02K1/17H02K1/27H02K7/003H02K7/1823H01F1/0557H01F7/02H02K2213/03
Inventor 堀内阳介樱田新哉松下真琴高桥则雄长谷部寿郎木内宏彰徳增正
Owner KK TOSHIBA