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stator core

A stator core and rotor technology, applied in the direction of magnetic circuit shape/style/structure, transportation and packaging, connection with control/drive circuit, etc., can solve problems such as tooth deformation

Active Publication Date: 2021-11-30
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the teeth may be deformed

Method used

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Experimental program
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Effect test

no. 1 approach

[0034] First refer to figure 1 , the motor as the rotary electric machine having the stator core according to the first embodiment is used in the electric power steering apparatus 20 of the vehicle.

[0035]

[0036] First, the electric power steering device 20 will be described. like figure 1 As shown, the electric power steering device 20 is provided in the steering system 10 . In the steering system 10, the rotational motion of the steering wheel 11 generated by the driver of the vehicle is transmitted to the rack and pinion mechanism 13 via the steering shaft 12 and changed into a linear motion of the rack shaft 14, thereby changing the wheel through the tie rod 15. 16 directions. The electric power steering device 20 outputs assist torque to the steering shaft 12 to assist the driver's steering operation.

[0037] The electric power steering device 20 includes a torque sensor 21 , an electronic control unit (ECU) 22 , a motor 23 and a transmission mechanism 24 . A ...

no. 2 approach

[0065] in such as Figure 13 In the shown second embodiment, the triple tooth portion 101 is formed by combining three top connecting tooth portions 83 connected by a top magnetic circuit portion 85 . The plate 102 is formed such that three top split tooth portions 84 and one triple tooth portion 101 are alternately arranged in the circumferential direction. The stator core 103 is formed by rotationally stacking a plurality of plates 102 of the same type at a fixed rotational increment angle 3θ. Similar to the stator core 54 of the first embodiment, the stator core 103 includes a partial connection portion 93 and an opening portion 94 . Therefore, the second embodiment provides the advantages (A) to (F) described above.

no. 3 approach

[0067] in such as Figure 14In the third embodiment shown, the quadruple tooth portion 111 is formed by combining four top connecting tooth portions 83 connected by the top magnetic circuit portion 85 . The plate 112 is formed such that four top split tooth portions 84 and one quadruple tooth portion 111 are alternately arranged in the circumferential direction. The stator core 113 is formed by rotationally stacking a plurality of plates 112 of the same type at a fixed rotational increment angle 4θ. Similar to the stator core 54 of the first embodiment, the stator core 113 includes a partial connection portion 93 and an opening portion 94 . Therefore, the third embodiment provides the advantages (A) to (F) described above.

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PUM

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Abstract

A stator core (54) is a stack of plates (81). Each plate (81) includes an annular back yoke portion (82), a plurality of top connecting tooth portions (83), a plurality of top separating tooth portions (84), a plurality of magnetic circuit portions (85) and a plurality of top opening portions (86). The top connecting tooth portion and the top separating tooth portion protrude from the back yoke portion in a radial direction. The top magnetic circuit part (85) connects the top ends of the two top connecting tooth parts (83). The top opening portion (86) is open toward the rotor (33) side on both sides of the top end of the top separation tooth portion (84). The stator core (54) includes a back yoke (91), a plurality of teeth (92), a plurality of partial connection parts (93), and a plurality of opening parts (94). Each partial connection portion (93) is formed by a plurality of top magnetic circuit portions (85) and a top opening portion (86) extending in the axial direction. Each opening portion (94) is formed only by a plurality of top opening portions (86) extending continuously in the axial direction.

Description

technical field [0001] The invention relates to a stator core for a stator of a rotating electrical machine. Background technique [0002] It is known in rotating electrical machines to connect the tips of the teeth of the stator core in order to reduce the cogging torque. In the case where the tip portions of all the teeth are connected, the leakage flux in the stator increases and the torque decreases. Patent document JP 2013-81303A (US2014-0246944A1) proposes to only partially connect the tip portions of the teeth. [0003] With the top end portions of the teeth connected, there is no part that keeps the teeth from deforming when the windings are formed in the stator core. Therefore, the teeth may be deformed. Contents of the invention [0004] It is therefore an object of the present invention to provide a stator core of a rotating electric machine which reduces cogging torque and protects the teeth from deformation thereof. [0005] According to one aspect, a stat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/16
CPCH02K1/165B62D5/0403H02K1/16H02K5/225H02K2213/03H02K11/33H02K1/276H02K29/03B62D5/0412B62D5/0463H02K1/146
Inventor 田中飞鸟藤崎胜也
Owner DENSO CORP