JPS62250845A - Formation of motor stator core - Google Patents

Abstract

PURPOSE:To enable scattering of welded spots, prevent a local thermal change and improve magnetic characteristics by forming a stator core through irradiating a laminated steel plate with laser beam. CONSTITUTION:A laminated steel plate 12 is placed on a rotating table 10 and being biased from its top face by a keep plate 11. Laser irradiation means 13 such as laser beam gun are arranged on both sides of the rotating table 10 and the outer peripheral face of the steel plate 12 is irradiated with laser beam from both sides. The rotating table 10 is so constituted as to enable rotation and to move up and down by an elevator means. Welding is performed by irradiation of laser beam from the laser irradiation means 13 while the rotating table 10 is revolved as it is operated upwardly. Accordingly, a spiral weld line 14 is formed on the outer peripheral face of the laminated steel plate 12 and skew welding is performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of forming a stator core of an electric #J machine by welding thin steel plates that have been punched into a predetermined shape.
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(Prior Art) A stator core of an electric motor is generally formed by laminating stamped steel plates and bonding them together to form an integral body. When integrating this, conventionally the outer peripheral surface of the steel plate was
Metal tnert Ga5) l'3 contact, ■IQ(
This is done by arc welding such as Tungsten Inert Ga5) welding or CO2 (carbon dioxide gas) welding.

FIGS. 4 and 5 are a perspective view and a plan view of this arc-welded stator cabinet 1. FIG. A plurality of substantially ring-shaped punched steel plates 2 are stacked, and an insertion hole 3 into which a rotor (not shown) is inserted is formed in the shape of an awl, and teeth 4 are formed around the insertion hole 3. Slits 5 are formed at regular intervals through the. This stator core 1
There is a concave groove 6 on the outer peripheral surface to concentrate the arc during welding.
A plurality of grooves are formed at regular intervals, and welding is performed on the groove 6 portion.

(Problem to be solved by the invention) Therefore, in the conventional arc welding forming method J3, the welding location is fixed to the groove 6, and it is impossible to weld to any desired depth. The degree of freedom of ii1 is limited.Also, because the welding point is fixed and shortened, the magnetic properties are biased and the electrical properties are also poor.Furthermore, the heat effect due to arc welding It acts only around 6, causing local thermal deformation and thermal deterioration.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the drawbacks of conventional means and to provide a method for forming a motor stator core by laser beam irradiation. 2 [Means for solving the problems] In order to solve the problems of arc welding, the present invention has the following steps:
Welding is performed by irradiating the outer peripheral surface of a steel plate with a laser beam.

[For production]

Since no arc is generated in laser beam welding, there is no need to form grooves on the outer peripheral surface of the stator core. Therefore, the welding location can be arbitrarily selected, and welding can be performed without affecting the magnetic properties.

(Example〕 The present invention will be explained in more detail below.

The present invention involves stacking hammered steel plates and welding the steel plates by irradiating the outer circumferential surface of the stacked steel plates with a sea 11 beam. The laser beam to be irradiated is selected appropriately depending on the characteristics, thickness, etc. of the steel plate, but it has a strong melting power and does not emit laser beams, so welding can be performed at any location. Can be done.

FIG. 1 is a perspective view of an example of a device for performing this welding.

A laminated steel plate 12 is placed on a rotary table 10,
It is pressed from above by a pressing plate 11. Laser irradiation means 13 such as laser beam guns are arranged on the left and right sides of the rotary table 10 so that the outer peripheral surface of the steel plate 12 is irradiated with a laser beam from the left and right sides. The rotary table 10 is configured to be rotatable and can be moved up and down by a lifting means (not shown). Welding is performed by raising the rotary table 10 while rotating it and by irradiating a laser beam from the radar irradiation means 13. As a result, a spiral welding line 14 is formed on the outer circumferential surface of the laminated steel plates 12, and welding is performed.

Figure 2 shows the stator core 2 formed by the above method.
1 is a perspective view of FIG. A spiral weld 1i14 is formed on the outer peripheral surface of the stator core 21, in which a rotor insertion hole 22 is formed in the axial direction and throwers 1 to 23 are formed at regular intervals around the insertion hole 22. This type of laser beam welding does not require the formation of grooves on the outer circumferential surface of the stator core, and can be welded at any location, which helps balance thermal deformation. The magnetic properties can also be improved.

FIG. 3 is a perspective view of another example of the stator core 21 molded according to the present invention. Welding line 1 by laser beam irradiation
4 are formed on the outer circumferential surface of the stator core 21 in a randomly distributed state in the axial direction. In this case,
Raise either the rotating table or the laser irradiating means relative to the other while irradiating the radar irradiating means with a mustard + IJ'' beam, then interrupt the sea 11 beam means, rotate the rotating table, and emit the laser beam. This is possible by raising one relative to the other while irradiating.

〔Effect of the invention〕

As described above, according to the present invention, since the stator core is formed by irradiating the sea 11 beam onto the laminated steel plates, welding locations can be arbitrarily selected.

This makes it possible to disperse the welding locations, prevent local thermal deformation, and improve magnetic properties.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an example of a welding device used in the present invention;
FIG. 2 is a perspective view of a stator core molded according to the present invention, FIG. 3 is a perspective view of another example of the stator core, and FIGS. 4 and 5 are a perspective view and a plan view of a stator core molded by a conventional method. . 13... Ray + f annual 1 means, 14... Welding line, 2
1... Stator core. Applicant Representative Mr. Sato Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. When welding and integrating the outer circumferential surfaces of the laminated punched steel plates, the welding is performed by irradiating the outer circumferential surfaces of the steel plates with a laser beam using a laser irradiation means. Molding method for electric motor stator core. 2. The method of forming an electric motor stator core according to claim 1, wherein at least one of the laser irradiation means or the steel plate is rotated and moved up and down relative to the other for welding.