JPS5917837A - Stator for synchronous electric motor - Google Patents

Abstract

PURPOSE:To facilitate the mechanical machining of a stator body by a construction wherein a welding part for welding a core sheet lamination and an end reinforcing member is extended from the outer surface of the core sheet lamination up to a position axially short of the outer surface of the end reinforcing member. CONSTITUTION:A stator body 10 serving as also an envelop for a synchronous electric motor is composed of a core sheet lamination comprising a number of core sheets 11 and a pair of end reinforcing members 12 fixed by welding to both ends of the core sheet lamination. Each end reinforcing member 12 has a cylindrical form. Welding parts 13 for welding the core sheet lamination and the end reinforcing members 12 are formed on the outer surface of the core sheet lamination all over the total length of the core sheet lamination in a laminating direction, and also extended from the outer surface of the core sheet lamination up to a position axially short of the outer surface of the end reinforcing members 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a synchronous motor. In the case of a synchronous motor, for example, an AC servo motor, it is an issue to reduce the weight of the entire manufacturing shed and simplify the manufacturing process. ing. For this reason, in the past, a stator body was formed that also served as the outer cover of the synchronous motor, and coils were wound around the circular grooves formed on the inner circumference of the stator body, and the coils were wound around the circular grooves on both end faces of the stator body. A method has been adopted in which the end housing with the child bearing is bolted together, and a method in which the stator body is integrally constructed by welding a stack of many core sheets and an end reinforcing member has been adopted. It is taken.

However, in such a configuration, deformation occurs due to welding of the core sheet laminate and the end reinforcement member,
After welding, it is necessary to correct the deformation by lathe processing or the like, and the problem is how to facilitate such post-processing.

In addition, screw holes for attaching the end housing to the stator body after welding are machined and formed, but these screw holes need to be provided at positions that do not interfere with the welded portions. For this reason,
The challenge is to ensure space for forming screw holes without increasing the size of the stator in the radial direction.

1!1 and 2 show a synchronous motor using a conventional stator. The stator includes a stator body 1 that also serves as the outer cover of the synchronous motor. This stator body 1 consists of a core sheet laminate made up of a large number of core sheets 2, and end reinforcing members 3 fixed to both ends of the core sheet laminate by welding. Two grooves are formed on the side for inserting the coil (see Figure 2). The conventional end reinforcing member 3 is made of a thin plate material, and a groove 3A for inserting a reinforcing rod is formed on the outer surface of the end reinforcing member 3.

The groove 3A is open on both end surfaces of the end reinforcing member 3. Grooves similar to the grooves 3A are formed on the outer surface of the core sheet 2, reinforcing rods are inserted into these grooves, and the core sheet laminate and the end reinforcing member 3 are inserted along the reinforcing rods. The stator body 1 is welded as shown by reference numeral 4. The stator main body 1 is finished by cutting after the welding process and the coil winding process are completed, but since the conventional end reinforcement member 3 is made of a thin plate material, Its processing is difficult. On the other hand, screw holes 3B for bolting the end housing 5 are machined and formed on the outer end surface of the end reinforcing member 3, but in the conventional stator, the welded portion 4 is a thin plate-shaped end reinforcing member. Since it extends to the outer end surface of 3, the screw hole 3B
It is necessary to provide it at a position shifted in the circumferential direction so as not to interfere with the welded part 4. Therefore, it is necessary to separately secure a radial space for the welding part and a radial space for the screws in the end reinforcing member 3, and as a result, the stator becomes larger in the radial direction. There is.

In view of the above drawbacks, the present invention provides a synchronization system that allows the welding process of the stator body and the coil winding to be easily carried out by mechanical JJO work after the process, and further reduces the size in the radial direction and improves longevity. The purpose of the present invention is to provide a stator for a growing machine.

In order to achieve the above object, the present invention has a stator main body that also serves as the outer cover of a synchronous motor, and a core sheet laminate made of a large number of core sheets, and a core sheet laminate that is fixed to both ends of the core sheet laminate by welding. In the stator for a synchronous machine constructed of an end reinforcing member, the end reinforcing member is a cylindrical member, and the welding portion where the core sheet laminate and the end reinforcing member are ft welded is the core sheet laminate. It is characterized by extending from the outer surface of the end reinforcing member to a midway position in the axial direction of the outer surface of the end reinforcing member.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 to 6.

In FIG. 3, numeral 10 is a stator body which also serves as the outer cover of the synchronous motor, and the stator body 10 is made up of a core sheet laminate consisting of a large number of core sheets 11 and welded to both ends of the core sheet laminate. Therefore, the end reinforcing member 12 is fixed. As shown in FIG. 4, a groove 11A for inserting a coil is formed on the inner peripheral side of the core sheet 11 over the entire circumference.

The end reinforcing member 12 is a cylindrical body. A welding part 13 for welding the O core sheet laminate and the end reinforcing member 12 is formed on the outer surface of the core sheet laminate over the entire length in the core sheet stacking direction. - and one extending from the outer surface of the core sheet laminate to a midway position in the axial direction of the outer surface of the end reinforcing member 12.

To explain in more detail, as shown in Figure 5 and Figure 6, each core sheet 11 has a groove 11B formed on the outer surface thereof through which a reinforcing rod 14 is inserted.
A groove 12A having the same cross-sectional shape as the groove 11B is formed on the outer surface of the end reinforcing member 12, and the groove 12A extends from the end surface of the end reinforcing member 12 to an intermediate position in the axial direction. The reinforcing rod 14 passes through the groove 11B of the core sheet 11 and connects to the end reinforcing member 12.
It extends into the groove 12A of the reinforcing rod 14 and the core sheet 1.
1 and the end reinforcing member 12 are integrally attached Lz#. Here, the core sheet 11 and the end reinforcing member 12id have an approximately regular octagonal outer shape, and welding is performed along each corner of the core sheet 11 and the end reinforcing member 12.

A coil is wound around the stator body 10 that has undergone the welding process. Although the coil protrudes from both ends of the coil stack, the protruding portions 15 of the coil do not protrude to the outside of the end reinforcing member 12. The stator body 10, which has completed the coil winding work, is subjected to machine 7JQ work. By this machining, the stator main body 10 is finished into a desired size and shape.

Further, the end reinforcing member 12 is formed with a screw hole 12B for bolting a flange-like end housing 16 provided with a rotor bearing. In terms of strength, this screw hole 12B is preferably formed at a corner of the end reinforcing member 12, that is, at a position on the end surface where the radial width is maximum. As mentioned above,
A welded portion 13 is formed at the corner of the end reinforcing member 12, and according to the present invention, the welded portion 13 extends halfway in the axial direction of the one end reinforcing member 12, as shown in FIG. Therefore, there is a screw hole 12B in the corner part of the end reinforcing member 12.
Even if the screw hole 12B and the welded portion 13 are formed, there is no interference between the screw hole 12B and the welded portion 13. For the reasons mentioned above, the screw holes 12B are formed in the end face near each corner of the end reinforcing member 12.

According to such a configuration, the radial dimension between the corners of the end reinforcing member 12 can be reduced to the minimum, so that the stator can be made smaller and lighter in the radial direction. The length in the axial direction of the end reinforcing member 12 can be selected to be a necessary dimension, taking into consideration the ease of attachment to a machining machine, the depth of the screw hole 12, and the like. Note that since the end housing 16f can be shortened by the increase in the axial length of the one end reinforcing member 12, the overall length of the synchronous motor does not increase.

Although one embodiment has been described above, the present invention is not limited to the aspect of the above embodiment, and may be applied to, for example, changes to the form of the welded part, the outer shape of the core sheet, the end reinforcing member, etc. This can be easily done by business operators.

As is clear from the following explanation, the present invention provides a cylindrical member for the end gI oil part, and a welding part for welding the core sheet laminate and the end reinforcing member from the outer surface of the core sheet laminate. This is characterized by extending the outer surface of the end reinforcing member to a halfway point in the axial direction, so the welding process and coil winding are carried out on the stator body machine after leaving the factory (JIJ).
You will be able to carry out the work easily. (b) When forming screw holes for bolting the trochanter bearing housing, the space for forming the screw holes can be secured without increasing the radial dimension of the stator body. Become.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical cross-sectional side view of a synchronous motor incorporating a conventional stator for a synchronous motor, and Fig. 2 is an end face of a conventional stator for a synchronous motor as seen from the single-layer wiring direction shown in Fig. 1. FIG. 3 is a partial vertical cross-sectional side view of a synchronous motor incorporating a stator for a synchronous motor according to an embodiment of the present invention, and FIG.
- An end view of a conventional stator for a synchronous motor as seen from the direction of line IV, Fig. 5 is an enlarged vertical sectional view of the main part of the stator shown in Fig. 3, and Fig. 6 is an end view of the stator shown in Fig. 43. In the main part enlarged cross-sectional view, 10 is the stator main body, the lil tsuyu sheet,
IIA indicates a groove, 12 indicates an end reinforcing member, and 13 indicates a welded portion. Patent Applicant Fanuc Co., Ltd. Patent Application Agent Akira Aoki Patent Attorney Kazuyuki Nishidate Patent Attorney Kuni Nishioka Figure 1 ■ Figure 3 ■ Figure 2 Figure 4 Figure 5] b 182- Figure 6

Claims (1)

[Claims] For a synchronous motor, the stator body, which also serves as the outer cover of the synchronous motor, is composed of a core sheet laminate made of a large number of core sheets, and an end reinforcing member fixed to the leakage part of the core sheet laminate by welding. In the stator, the end reinforcing member is formed of a cylindrical member, and the welding portion for welding the core sheet laminate and the end reinforcing member is connected from the outer surface of the core sheet laminate to the end reinforcing member. A stator for a synchronous motor, characterized in that the stator extends halfway in the axial direction of the outer surface.