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induction motor

A technology of induction motor and direction of rotation, applied in asynchronous induction motors, electric components, electromechanical devices, etc., can solve the problems of increased second-order copper loss of high-order harmonics, increased components of high-order harmonics, and deterioration of motor characteristics.

Active Publication Date: 2018-12-11
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the spatial high-order harmonic component will also increase, and the resulting high-order harmonic secondary copper loss (copper loss on the rotor side) will also increase, and the motor characteristics may deteriorate.

Method used

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Experimental program
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no. 1 approach

[0027] First, according to Figure 1 to Figure 4 , and the first embodiment will be described.

[0028] figure 1 It is a schematic configuration diagram of the induction motor 1 . figure 2 is along figure 1 Sectional view of line A-A.

[0029] Such as figure 1 , figure 2 As shown, the induction motor 1 includes a substantially cylindrical stator 2 and a rotor 3 , which are provided radially inward of the stator 2 and are provided rotatably relative to the stator 2 .

[0030] In addition, in the following figures, the scale of each member is appropriately changed for the sake of understanding and explanation. In the following description, the axial direction of the rotor 2 is simply referred to as the axial direction, the rotational direction of the rotor 2 is referred to as the circumferential direction, and the radial direction of the rotor 2 is simply referred to as the radial direction.

[0031] The stator 2 has a substantially cylindrical stator core 4 . The stat...

no. 2 approach

[0052] Next, according to image 3 , Figure 5 , Figure 6 , and the second embodiment will be described.

[0053] Figure 5 is a schematic configuration diagram of an induction motor 201 according to the second embodiment, and corresponds to the above-mentioned figure 2 Sectional view of line C-C. Figure 6 is along Figure 5 Sectional view of line D-D. In addition, in the following description, the same code|symbol is attached|subjected to the same structure as 1st Embodiment, and description is abbreviate|omitted (the same applies to the following embodiment).

[0054] Such as Figure 5 , Figure 6 As shown, in this second embodiment, the depressed portion 16 (inclined surface 17) formed on the flange portion 12 of the rotor tooth 10 is not formed in the entire axial direction of the flange portion 12, but is formed avoiding the The positions of both ends of the rotor tooth 10 in the axial direction. This point is different from the first embodiment described abo...

no. 3 approach

[0062] Next, according to Figure 7 , Figure 8 , and the third embodiment will be described.

[0063] Figure 7 is a schematic configuration diagram of an induction motor 301 according to the third embodiment, and corresponds to the above-mentioned figure 2 Sectional view of line C-C. Figure 8 is along Figure 7 Sectional view of the H-H line.

[0064] Such as Figure 7 , Figure 8 As shown, in the third embodiment, the inclination of the depressed portion 16 (inclined surface 17 ) formed on the flange portion 12 of the rotor tooth 10 is set to gradually become steeper toward the center in the axial direction. This point is different from the first embodiment described above.

[0065] In addition, the cross-sectional shape of both ends of the rotor tooth 10 in the axial direction (along Figure 7 The shape of the cross-section of the F-F line) is the same as that of the above-mentioned second embodiment Figure 6 same. In addition, the cross-sectional shape (alon...

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Abstract

An induction motor according to an embodiment of the present invention has a stator and a rotor. In the stator, stator coils are disposed on a stator core having a plurality of stator slots. The rotor core of the rotor has a plurality of rotor teeth, and rotor slots formed between the plurality of rotor teeth and in which the rotor conduction portion is arranged. The rotor tooth has a tooth body portion and a flange portion. The tooth body portion extends along the radial direction of the rotor core. The flange portion extends from the tip of the tooth body portion along the rotational direction of the rotor core. Further, a depressed surface is formed on at least a part of the radially outer outer peripheral surface of the flange portion. The depressed surface is farther away from the stator core toward the tip in the rotational direction than the radially outer end surface of the tooth main body portion. In addition, the flange portion becomes thinner toward the tip in the rotation direction.

Description

technical field [0001] Embodiments of the present invention relate to induction motors. Background technique [0002] As an induction motor, a so-called cage-type induction motor using a cage-type rotor is known. This cage-type induction motor includes: a stator in which a stator coil is disposed on a substantially cylindrical stator core having a plurality of stator slots; and a rotor provided inward in a radial direction compared with the stator and rotatable relative to the stator. freely. [0003] The rotor has a rotating shaft and a rotor core fixed to the rotating shaft. A plurality of rotor teeth extending in the radial direction are arranged radially on the rotor core, and rotor slots are formed between the rotor teeth adjacent in the circumferential direction. A rotor bar (conductor bar) is arranged in the rotor slot. End rings are provided at both ends in the axial direction of the rotor bar, and the end rings are formed in a ring shape so as to surround the ci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K17/16
CPCH02K2201/03H02K2213/03H02K1/24H02K17/20H02K17/16H02K1/16H02K1/26
Inventor 松下真琴三须大辅高桥则雄竹内活德伊藤史晃长谷部寿郎
Owner KK TOSHIBA
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