JPH0578262B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for attaching legs of a rotating electrical machine to a frame of a rotating electrical machine.

[Prior Art] FIG. 7 is a side view of a conventional rotating electric machine, partially shown in cross section, and FIG. 8 is a front view thereof. In the figure, 1 is a stator, 2 is a frame to which the stator 1 is attached and fixed on its inner periphery, 3 is its body, and 4 is a leg attached below the body 3. The body 3 and the legs 4 Both are made of steel plate members. 5 is a rotor, and 6 is a rotating shaft on which the rotor 5 is mounted, which is supported by a bracket 7 via a bearing. 8,
Reference numeral 9 denotes a base and a support that constitute the leg portion 4, and the support 9 and the body 3 and the support 9 and the base 8 are both joined by arc welding A and B.

In the conventional rotating electric machine as described above, legs 4 made of thick steel plates are directly welded by arc welding to a cylindrical body 3 made of thin steel plates, and then the stator 1 is pressed into a predetermined position on the body 3 by pressing or the like. It was press-fitted into position and assembled with other parts as a rotating electric machine.

In the conventional rotating electric machine configured as described above, when attaching the legs 4 to the body 3, arc welding A
Deformation of the body 3 due to the thermal influence of the heat was unavoidable. As a result, the contact between the outer circumferential surface of the stator 1 and the inner circumferential surface of the body 3 becomes uneven, creating a space in some parts, which reduces the cooling effect of the rotating electric machine and causes the coil to burn out due to the temperature rise. In addition, rotating electric machines may generate small noises due to the unevenness of the air gap between the stator 1 and the rotor 5. Non-uniform contact may be amplified and result in noise.

In order to solve this problem, conventionally, the inner peripheral surface of the body 3 was cut to correct thermal deformation before the stator 1 was press-fitted into the body 3, but the frame manufacturing process was The process became complicated and caused an increase in costs.

Therefore, the method for attaching the legs of a rotating electrical machine reduces the thermal deformation of the frame 2 during welding of the legs 4 and eliminates the conventionally required cutting process of the inner peripheral surface of the body 3 of the frame 2 after welding. The provision of this is widely requested by consumers.

Therefore, in order to improve this problem, the inventor invented the invention shown in FIGS.
(See Patent Application No. 198254).

That is, in FIGS. 5 and 6, 10 is the pedestal 8.
A fixing jig 15 is used to fit two parallel supports 9, one end of which is arc welded to the pedestal 8, and the other end of which is attached to the body 3 of the frame 2; 9 and the body portion 3. 11 is a laser irradiation gun; 12 is a laser beam irradiated from the laser irradiation gun 11;

The method for attaching the legs of a rotating electric machine having such a configuration is as follows: First, the support 9, which is welded to the pedestal 8 by arc welding or the like,
9 is attached to the outer peripheral surface of the body 3 using a fixing jig 10, and the contact portion 15 is irradiated with a laser beam 12 from a laser irradiation gun 11 at an angle substantially parallel to the contact surface. The laser irradiation gun 11 is moved along the contact portion 15 of the support column 9 to perform welding. Since the contact portion 15 is laser beam welded in this way, the amount of heat input into the body 3 during welding is extremely small compared to arc welding, and therefore almost no thermal deformation of the body 3 occurs. .

[Problems to be Solved by the Invention] Here, the characteristics of laser welding will be briefly explained in comparison with arc welding.

Generally, the energy density of the laser beam used for laser welding is much higher than that of arc welding, and the penetration ratio (bead depth/bead width) is extremely large, resulting in overwhelming thermal distortion of the welded object. It has the advantage of being small. On the other hand, since the diameter of the laser beam is small, it has the disadvantage that high joint accuracy and high weld line tracing accuracy are required during welding.

Therefore, in the conventional method for attaching the legs of a rotating electric machine as described above, the other ends of the supports 9, 9, which are welded to the base 8 by arc welding or the like, are attached to the body 3 using a fixing jig 10. The contact portion 15 is irradiated with a laser beam 12 by a laser irradiation gun 11 and welded to the outer peripheral surface.

Therefore, in actual work, due to the machining error of the body part 3 and the accuracy of the leg part 4 due to normal sheet metal processing, the two columns 9, 9 may be attached to the body part 3 at the same time. Since it is difficult to maintain the splicing accuracy required for laser beam welding, there are problems in that positioning work, which is a pre-process for splicing, is time-consuming, or stable welding strength cannot be obtained. Ta.

This invention has been made to solve these problems, and also includes the following:
By reducing the thermal deformation of the frame, the cutting process on the inner circumferential surface of the frame body after welding, which was previously required, can be omitted, or sizing can be done by inexpensive tube expansion, and the work of attaching the legs is extremely easy. The purpose of this invention is to realize a method for attaching the legs of a rotating electrical machine.

[Means for Solving the Problems] A method for attaching legs of a rotating electric machine according to the present invention is such that the legs to be attached to the trunk of a frame made of a metal material in a cylindrical shape are attached to the first support column. and a pedestal portion integrated with the first mounting foot, and a second mounting foot serving as a second support portion, and one end of the upper first support portion of the first mounting foot is attached to the frame. a first mounting leg welding step in which the contact surface is laser beam welded to the outer circumferential surface of the body of the frame; a second mounting foot welding step in which the contact surface is laser beam welded to the surface, and after the first mounting foot welding step and the second mounting foot welding step, the above-mentioned The method includes a pedestal part welding step of welding a contact surface between the pedestal part and the second support part constituting the second mounting foot.

[Function] In the method for attaching the legs of a rotating electrical machine according to the present invention, the two attachment legs are individually attached to the outer periphery of the body of the frame, so each attachment leg can easily and precisely adhere to the outer periphery of the body of the frame. Laser beam welding is performed in this state, and then the pedestal part of the first mounting leg and the other end of the second support part of the second mounting leg are welded, so the heat during this welding is conducted through the mounting leg. The heat reaches the body of the frame, and the influence of heat on the body of the frame is reduced. Therefore, even if welding is performed by a welding method other than laser beam welding, the thermal effect on the body of the frame is reduced.

[Embodiments of the Invention] FIG. 1 is a front view of a frame of a rotating electric machine embodying the present invention, and FIGS. 2 to 4 are explanatory diagrams of embodiments of the invention.

First, a case will be described in which a mounting foot in which a pedestal part and a support part are integrated is joined to a body part of a frame.

In the first step shown in FIG.
to be fixed. And the pedestal part 13 of the first intermediary foot 17 in which the pedestal part 13 and the support part 16 are integrally formed.
is fixed to the fixture 8, the end of the support column 16 is attached to the outer peripheral surface of the body 3, and the fixture 14 and the fixture 1 are connected to each other.
A laser beam 12 is irradiated from a laser irradiation gun 11 to the contact portion 5 held by the contact portions 8 at an angle substantially parallel to the contact surface, and the laser irradiation gun 11 is traced along the contact portion 15 to perform welding.

Next, as shown in FIG. 3, in the second step, the body 3 is fixed in the same manner as in the case of FIG. 17 is received by the support 19 on the support 16, and one end of the second mounting foot 20 is brought into contact with the surface of the base portion 13 of the first mounting foot 17, so that the second The other end of the mounting foot 20 of the body 3
A laser irradiation gun 11 is used to irradiate the contact portion 22, which is attached to the contact portion 22 and clamped by the fixture 21 that presses the fixture 14, the receiver 9, and the second mounting foot 20 from above, from an angle substantially parallel to the contact surface. The beam 12 is irradiated and the laser irradiation gun 11 is traced along the contact portion 22 to perform welding.

Next, as shown in FIG.
By arc welding the contact portions with an arc 32 from a welding torch 31, a frame for a rotating electrical machine embodying the present invention as shown in FIG. 1 can be obtained.

As explained above, the first mounting foot 17, the second
Each contact part 1 between the mounting foot 20 of the frame and the body part 3 of the frame
5 and 22 are individually attached to the body 3 and laser welded, so that the high joining accuracy required for laser welding can be easily achieved, and the heat dissipated to the body 3 during welding can be easily achieved. The amount of input is extremely small compared to arc welding, and therefore thermal deformation of the body 3 is extremely small.

In addition, in the above embodiment, a case was explained in which the first mounting leg 17 and the body part 3 are laser welded, but the second mounting leg 20 and the body part 3 are first laser welded, and then the first welding is performed. The mounting legs 17 and the body portion 3 may be laser welded. However, the first mounting foot 17
Arc welding of the second mounting leg 20 and the second mounting leg 20 are performed last.

Further, the support portion 16 of the first mounting foot 17 and the pedestal portion 13 may be integrated by bending a substantially rectangular flat plate, may be formed by welding the two, or may be formed as a drawn material. That's fine.

In addition, the support portion 6 of the first mounting leg 17 and the pedestal portion 1
3 may have different plate thicknesses.

Furthermore, welding other than the arc welding described above, such as laser welding, may be used to weld the second mounting leg 20 and the second mounting leg 17 together.

Furthermore, in FIG. 3 illustrating an embodiment of the method according to the invention, the second mounting foot 20 is attached to the body 3.
When laser welding is performed, a method is used in which the other end of the second mounting foot 20 is positioned by contacting the surface of the pedestal portion 13 of the first mounting foot 17, but such contact is avoided. To do this, use a clamp jig that holds the second mounting leg 20 independently, and set the end of the second mounting leg 20 to be laser welded against the surface of the body part 3, and perform the second mounting. A gap may be provided between the joint surfaces of the foot 20 and the first mounting foot 17 to the extent that they can be joined by arc welding or the like.

[Effects of the Invention] As described above, according to the present invention, the rotating electric machine leg is divided into the first mounting leg and the second mounting leg,
Since each piece is individually attached to the outside of the body of the frame and laser welded, it is easy to obtain the high joining accuracy required for laser welding, and thermal deformation inside the body of the frame is small. Cutting inside the body of the frame can be omitted, or sizing can be done by inexpensive tube expansion, which facilitates the manufacturing work of the rotating electric machine and reduces costs.

[Brief explanation of the drawing]

Fig. 1 is a front view of a frame for a rotating electrical machine embodying an embodiment of the present invention, Figs. 2 to 4 are explanatory diagrams of an embodiment of the invention, and Figs. This is to explain the frame of an electric machine. Fig. 5 is a front view of a rotating electric machine whose legs are attached by a laser beam, Fig. 6 is a situation diagram showing the situation in which the frame shown in Fig. 5 is manufactured, and Fig. 7 is a one-shot diagram. FIG. 8 is a side view of an ordinary rotating electrical machine showing a section in section, and FIG. 8 is a front view of FIG. 7 showing a rotating electrical machine with legs attached by arc welding. In the figure, 3 is the body of the frame, 11 is a laser irradiation gun, 12 is a laser beam, 13 is a pedestal part of the first mounting leg, 16 is a support part of the first mounting leg,
17 is the first mounting foot, 20 is the second mounting foot, 32
is an arc. In addition, in the figure, the same reference numerals are the same,
or a corresponding portion.

Claims (1)

[Claims] 1. In a method for attaching a leg to a rotating electric machine, the leg is attached to the trunk of a frame made of a metal material formed into a cylindrical shape. It is composed of a first mounting foot and a second mounting foot serving as a second support portion, and one end of the first support portion of the first installation foot is attached to the outer peripheral surface of the body of the frame. a first mounting foot welding step of contacting and laser beam welding the contact surface; and attaching one end of the second support portion constituting the second mounting foot to the outer peripheral surface of the trunk of the frame and making contact therewith. After the second mounting leg welding step of laser beam welding the surfaces, the first mounting leg welding step, and the second mounting leg welding step, the base portion of the first mounting leg and the second mounting leg are welded together. A method for attaching a leg of a rotating electrical machine, comprising the step of welding a pedestal part welding a contact surface with the second pillar part constituting a mounting leg.