JPH09191591A - Motor rotator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain firm and complete engagement between a rotator iron core and a rotating shaft and avoid complex processing of the rotating shaft by forming a plurality of grooves in the shaft hole inner wall of an iron core, and fixing the rotating shaft at the shaft hole. SOLUTION: A rotator has a prescribed depth and is formed with grooves 3 separated from each other at regular intervals. The stress applied to a rotator iron core 2 is distributed uniformly in the peripheral direction of the rotator iron core 2 and in the axial direction, thus there occur no problems such as damage to the stator iron core 2 due to uneven stress. The stator 1 has the same solid strength as the rotary shaft provided with lines biting into the shaft hole inner wall of the stator iron core 2. The rotator 1 permits processing of a detent such as knurling to be omitted, and provides cost reduction in processing the rotating shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor rotor characterized by being formed by an electric motor rotor core and a rotor shaft which are formed so as to have a plurality of grooves on the inner wall of the rotor core.

[0002]

2. Description of the Related Art Conventionally, a rotor used for an electric motor is disclosed in Japanese Patent Laid-Open No. 57-47840. This rotor is shown in FIG. As shown in Fig. 3, the rotor is constructed by fixing the rotor core to the rotary shaft by press-fitting the rotor shaft with a ridge that bites into the inner wall of the shaft hole of the rotor core, and the meshing with the rotor core is strong. I am getting a solid bond with.

[0003]

However, when the rotary shaft is provided with a ridge that bites into the inner wall of the shaft hole of the rotor core, there is a problem that the machining cost of the rotary shaft becomes high. The present invention provides a rotary shaft in which the engagement between the rotor core and the rotary shaft is strong and secure, and the complexity of the rotary shaft machining is suppressed to reduce the machining cost of the rotary shaft. The purpose is to do.

[0004]

In order to achieve the above object, the rotor core according to the present invention is formed so as to have a plurality of grooves on the inner wall thereof, and is formed by the rotor core and the rotating shaft. Is characterized by.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In a rotor according to the present invention, grooves having a predetermined depth and a predetermined spacing are regularly formed. Therefore, the stress applied to the rotor core is evenly distributed in the circumferential direction and the axial direction of the rotor core, and the problem that the rotor core is damaged due to the uneven stress does not occur. It has the same strength as a rotating shaft provided with a ridge that bites into the inner wall of the shaft hole of the rotor core. Further, the rotor can omit the step of processing a rotation stopper such as a knurl on the rotating shaft, and can reduce the processing cost of the rotating shaft.

Embodiments of the present invention will be described below with reference to the drawings. 1 is a schematic configuration diagram of a rotor according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a rotor according to an embodiment of the present invention. This groove depth 2d is about 3
The groove width 2w was about 2 mm. However, these values can be freely set according to the strength required at the time of use and the design rule, and are not limited to the above values.

Further, the shape of the groove is not limited to the above-mentioned substantially arcuate cross section, and may be a shape having a desired groove depth and a large contact area (for example, a substantially U-shaped or V-shaped cross section). Next, the manufacturing work of the rotor will be described. For example, a rotor core obtained by punching and stacking a silicon steel plate with an interference fit dimension and stacking the silicon core or a silicon steel sheet having a predetermined size and stacking the wires is wire-cut. The rotor core obtained as described above is press-fitted or shrink-fitted onto the shaft. As described above, according to the present embodiment, since the grooves having a predetermined depth and a predetermined distance are regularly formed, the stress applied to the rotor core is Evenly distributed in the circumferential direction and the groove direction, there is no problem of rotor core damage due to uneven stress. In this way, by forming a plurality of grooves having a predetermined depth and spaced at a predetermined interval on the inner wall of the iron core, the engagement between the rotor iron core and the rotating shaft can be strong and secure. You can

[0008]

As described above, the rotor according to the present invention is
The strength of the rotor core and the rotary shaft are integrally secured, the machining of the rotary shaft is prevented from being complicated, and the processing cost of the rotary shaft is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a main part of a rotor according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of a rotor according to an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a main part of a conventional rotor.

[Explanation of symbols]

 1 Rotation axis 2 Rotor iron core 3 Rotor iron core groove 4 Key 5 Knurled eye

Claims (1)

[Claims] 1. An electric motor rotor comprising a plurality of laminated rotor iron cores, a plurality of grooves being provided on an inner wall of a shaft hole of the iron core, and the rotating shaft being fixed to the shaft holes.