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Rotor and reluctance motor

A rotor and rotor core technology, applied in the direction of magnetic circuit, magnetic circuit rotating parts, magnetic circuit shape/style/structure, etc., can solve problems such as short-circuit current flow and energy efficiency reduction

Active Publication Date: 2019-04-02
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the conventional technology, the magnetic flux leaks from the permanent magnet installed in the rotor toward the stator, and an induced voltage is generated.
As a result, iron loss may occur during no-load rotation, and the energy efficiency of the system to which the reluctance motor is applied decreases.
In addition, there is a problem that if the terminals of the motor are short-circuited due to a failure of the drive device or the like during rotation, a short-circuit current flows.

Method used

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no. 2 approach

[0078] Hereinafter, a reluctance motor 1A according to the second embodiment will be described. Here, as a difference from the first embodiment, the center bridge BD is sandwiched between C The point that only one of the pair of barrier regions 18 is inserted with the permanent magnet 100 will be described. Hereinafter, descriptions of functions and the like common to those of the first embodiment described above will be omitted.

[0079] Figure 11 It is a cross-sectional view perpendicular to the rotating shaft 8 showing the structure of one pole of the reluctance motor 1A of the second embodiment. In the second embodiment, sandwiching the center bridge BD C The permanent magnet 100 is inserted in only one of the pair of barrier regions 18 , and a weight adjustment member WT having a mass similar to that of the permanent magnet 100 is inserted in the other barrier region 18 . That is, the permanent magnet 100 is arranged in the barrier region 18 biased to one side with r...

no. 3 approach

[0090] Hereinafter, a reluctance motor 1B according to a third embodiment will be described. Here, as a difference from the first and second embodiments, there is no center bridge BD C or peripheral bridge BD S Either side of this will be explained. Hereinafter, descriptions of functions and the like common to those of the first and second embodiments described above will be omitted.

[0091] Figure 13 It is a cross-sectional view perpendicular to the rotating shaft 8 showing the structure of one pole of the reluctance motor 1B of the third embodiment. In the third embodiment, only the peripheral bridge BD exists S , each flux barrier 11 has one barrier region 18 . In this case, in the above formula (1), it can be obtained by setting w B as 2w o To determine the size of the permanent magnet 100. In addition, in Figure 13 In , only the flux barrier 11 closest to the central axis O is marked with a sign of 18 indicating a barrier region and a sign of 100 indicating a ...

no. 4 approach

[0096] Hereinafter, a reluctance motor 1C according to a fourth embodiment will be described. Here, as a point different from the first to third embodiments, the point that three or more barrier regions 18 are formed will be described. Hereinafter, descriptions of functions and the like common to those of the first to third embodiments described above will be omitted.

[0097] Figure 14 It is a cross-sectional view perpendicular to the rotating shaft 8 showing the configuration of one pole of the reluctance motor 1C according to the fourth embodiment. exist Figure 14In , only the flux barrier 11 closest to the central axis O is marked with a sign of 18 indicating a barrier region and a sign of 100 indicating a permanent magnet, and the same applies to the other flux barriers 11 . In addition, the divided barrier regions are shown as 18a, 18b, 18c. In the fourth embodiment, since three barrier regions 18 are formed in each magnetic flux barrier 11, two central bridge port...

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Abstract

A rotor of an embodiment has a shaft and a rotor core fixed to the shaft. Multiple flux barriers are formed on the rotor core. Multiple bridge parts are formed on each of the flux barriers, and one ormultiple barrier regions having a lower magnetic permeability than that of portions other than the flux barrier are formed between the multiple bridge parts. A permanent magnet is disposed in at least one of the barrier regions. The magnetization direction of the permanent magnet is aligned with a direction intersecting the longitudinal direction of the flux barrier. In addition, a value of ([mu]0*SMxBr) / ([mu]re*tFB*wB) is in a range of 1.2 to 3.0 inclusive.

Description

technical field [0001] Embodiments of the present invention relate to a rotor and a reluctance motor. [0002] This application claims priority based on Japanese Patent Application No. 2016-170040 filed in Japan on August 31, 2016, the content of which is incorporated herein. Background technique [0003] A technique for improving the saliency of a reluctance motor by providing a permanent magnet in a rotor of a reluctance motor is known. [0004] However, in the conventional technology, the magnetic flux leaks from the permanent magnet provided in the rotor toward the stator, and an induced voltage is generated. As a result, iron loss may occur during no-load rotation, and the energy efficiency of the system to which the reluctance motor is applied may decrease. In addition, there is a problem in that when the terminals of the motor are short-circuited due to failure of the drive device or the like during rotation, a short-circuit current flows. [0005] prior art litera...

Claims

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Application Information

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IPC IPC(8): H02K1/27H02K1/22
CPCH02K1/246H02K1/276H02K1/2773H02K19/103H02K2213/03H02K1/24H02K1/2766H02K7/04H02K3/12
Inventor 竹内活德松下真琴高桥则雄三须大辅长谷部寿郎
Owner KK TOSHIBA
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