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Rotor core and method of fastening rotor core and rotary shaft

A rotor core and rotating shaft technology, which is applied in the field of fastening the rotor core and the rotating shaft, can solve problems such as the deformation of the rotor core 1, achieve the effect of reducing the change of magnetic flux and preventing axial deformation

Active Publication Date: 2011-11-16
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, since the plurality of steel plates constituting the rotor core 1 are not bonded together, the plurality of steel plates at both ends in the axial direction move in the axial direction along the shaft 2, whereby, as Figure 22 As shown by the circle of , there is a problem that the rotor core 1 is deformed in the axial direction

Method used

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  • Rotor core and method of fastening rotor core and rotary shaft
  • Rotor core and method of fastening rotor core and rotary shaft
  • Rotor core and method of fastening rotor core and rotary shaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0074] figure 1 It is an axial sectional view showing the structure of the motor using the rotor core according to the first embodiment. figure 2 It is a partial plan view of the rotor core and a part of the rotating shaft according to Embodiment 1 viewed from the axial direction. image 3 It is a partial perspective view showing main parts of the rotor core according to the first embodiment.

[0075] figure 1 The electric motor (rotating electric machine) 10 shown is, for example, a motor used for mounting on a vehicle such as a hybrid vehicle or an electric vehicle. The electric motor 10 includes a stator 18 having a stator core 17 and a stator coil 16, and Functioning as an armature; rotor 14 having a rotor core 12 and a shaft 11 as a rotating shaft, and functioning as a magnetic field; and a front case 10a and a rear case 10b, the front case 10a and the rear case 10b houses the stator 18 and the rotor 14, and is connected and fixed by fastening bolts (not shown).

...

Deformed example 1

[0093] Figure 8 It is a partial perspective view showing a main part of a rotor core according to Modification 1 of Embodiment 1. FIG. Such as Figure 8 As shown, the welding parts 12b-2, 12b-3 are provided on the protruding end surface of the first protruding bar 12b of the rotor core 12 (or the groove bottom surface of the first groove 12a), and are provided on the protruding end surface of the first protruding bar 12b. A predetermined range in the axial direction from one axial end and the other end of the end surface (or the groove bottom surface of the first groove 12a). In such a case, the laminated steel plates at both ends in the axial direction of the rotor core 12 are integrated by the welded portions 12b-2, 12b-3, respectively, so that the rotor core 12 can be effectively prevented from being deformed due to the shrink fit load. deformation towards the axial direction.

[0094] Furthermore, when the welded portions 12b-2 and 12b-3 are provided at both ends in th...

Deformed example 2

[0096] Figure 9 It is a partial perspective view showing a main part of a rotor core according to Modification 2 of Embodiment 1. Such as Figure 9 As shown, it is also possible to configure the welding parts 12b-4, 12b-6 provided from one end side of the protruding end surface of the first rib 12b (or the groove bottom surface of the first groove 12a) of the rotor core 12, and The welded portions 12b-5 and 12b-7 provided from the other end side alternate in the circumferential direction. That is, 12b-4 is provided at one axial end portion of the protruding end face of a certain first convex line 12b, 12b-5 is provided at the other axial end portion of the adjacent first convex line 12b, and 12b-5 is provided at the adjacent first convex line 12b. A 12b-6 is provided at one axial end portion of the protruding line 12b, and a 12b-7 is provided at the other axial end portion of the adjacent first protruding line 12b.

[0097] In this case, as in Modified Example 1 above, the...

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Abstract

The invention provides a rotor core and a method of fastening the rotor core and a rotary shaft. The method of fastening the rotor core having no end plate and composed of laminated steel plates, and the rotary shaft by means of thermal insert can prevent the rotor core from being axially deformed due to the thermal insert load. The rotor core (12) is formed by axially laminating a plurality of circular-ring-shaped steel plates having through holes embedded in the shaft (11). A first groove (12a) and a first projecting bar (12b) are alternately formed on circumferential direction of the rotor core (12) inner peripheral surface where the through holes are formed. The first groove (12a) is recessed towards the outer radial direction and axially extends. The first projecting bar (12b) projects towards the inner radial direction and axially extends. A welding part (12b-1) for combining axially adjacent steel plates together is equipped on the projecting end face of the first projecting bar (12b). The welding part (12b-1) is continuously equipped from one axial end to the other axial end.

Description

technical field [0001] The present invention relates to a rotor core of an electric motor used as a rotating electrical machine in vehicles such as hybrid vehicles and electric vehicles, and a method of fastening the rotor core and a rotating shaft. Background technique [0002] Conventionally, as a method of fastening a rotor core and a shaft (rotary shaft) of an electric motor (rotary electrical machine), there is a method described in Patent Document 1, for example. In this method, a collar member made of a material softer than that of the shaft is interposed between the rotor core and a shaft inserted through the center hole of the rotor core, and the tool is pressed against the shaft from the axial direction. The rotor core and the shaft are fastened to each other by deforming the end surface of the collar member. According to this method, when the end surface of the collar member is deformed by the tool, the vicinity of the end surface expands in the radial direction ...

Claims

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Application Information

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IPC IPC(8): H02K1/28
CPCY02T10/641
Inventor 久田友和宇鹰良介
Owner DENSO CORP
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