JPS6141389Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric motor having a fixed core inserted into a bracket, and more particularly to a structure for fixing a stator core in a bracket.

In an electric motor assembled by forming a frame by abutting and fixing two bottomed cylindrical brackets and press-inserting a stator core into this frame, the following examples (1) to (3) are used. The stator core is fixed within the bracket using various methods.

(1) Protrusions for positioning the press-fitting depth are formed on both brackets according to the stacking thickness of the stator core, and both end surfaces of the stator core after press-fitting are held between the protrusions of both brackets. Note that a rotation stopper for the stator core is provided separately.

(2) Form a protrusion for positioning the press-fit depth in the same manner as in (1) on only one bracket, and after press-fitting the stator core into this bracket, fix it with screws or the like from the outside of the bracket.

In (2) and (3), instead of fixing with screws, etc., caulk from the outside and insert a part of the bracket into the outer periphery of the stator core to fix it.

However, according to method (1), the position of the protrusions in the bracket must be changed for each slight change in the stacking thickness specifications of the stator core, which increases the number of types of brackets and impairs the effectiveness of mass production. There's a problem.

In addition, according to method (2), it is necessary to perform pilot hole processing such as tap processing from the outside of the bracket after the stator core is press-fitted, which slows down the flow of the production line. ) requires a lot of effort.

Furthermore, in method (3), since a part of the bracket is directly bitten into the stator core, this deformation force deforms the inner diameter of the stator core, making the gap between it and the rotor uneven. There is a fear.

The present invention was developed in view of the above circumstances, and an object of the present invention is to provide an electric motor in which a stator core can be easily and reliably fixed to one bracket side.

The present invention will be explained below based on embodiments shown in the drawings.

FIG. 1 is a diagram showing the shape of the core plate, and FIG. 2 is a diagram showing the state in which the core plates are laminated to form a stator core. Further, FIG. 3 is an axial sectional view showing the shape of the bracket, and FIG. 4 is a view showing a state in which the stator core is press-fitted into the bracket.

In the figure, 1 is an iron core plate formed by punching out an electric iron plate, and a notch 2 is formed on the outer periphery.

Reference numeral 3 designates a stator core formed by laminating core plates 1, which are stacked so that the positions of the notches 2 of the core plates 1 coincide with each other, and have vertical grooves 4a and 4b.An upper stator core 3a and a lower part 3b This vertical groove 4a,
4b in the rotational direction and stator core upper part 3a,
By stacking the lower parts 3b, the vertical groove 4a is blocked by the upper end surface of the stator core lower part 3b, and a locking part 5 is formed.

Forming such a locking portion 5 on the stator core 3 can be easily done by stacking the core plates 1 to a predetermined height dimension, then inverting the core plates 1 and stacking them. be able to.

6 is a cylindrical bracket with a bottom, and a flange 7 is provided on the joint surface with the other bracket (not shown).
is formed.

Reference numeral 8 denotes a holding portion 8 that can be bent inward, and is formed by cutting and raising the flange 7.

Further, the bracket 6 is provided with a protrusion 9 for positioning the press-fitting depth at the press-fitting end of the stator core 3, and this protrusion 9 is formed by cutting the bracket 6 inward.

In the above configuration, a procedure for inserting and fixing the stator core 3 into the bracket 6 after winding is completed will be explained.

First, as shown in FIG. 4, the stator core 3 is inserted into the bracket 6 by aligning the vertical groove 4a and the holding part 8, and the insertion side end surface of the stator core 3 abuts against the protrusion 9. Press in until the

Next, the retaining portion 8 of the bracket 6 is bent inward and engaged with the retaining portion 5 of the vertical groove 4a to be retained.

Therefore, the stator core 3 is held between the engagement portion of the holding portion 8 and the locking portion 5 and the protrusion 9 and is fixed so as not to move in the axial direction, and at the same time,
The engaging portion between the vertical groove 4a and the holding portion 8 is fixed to prevent movement in the rotational direction.

Therefore, according to the present invention, there is no need to form a structure for fixing the stator core 3 to the other bracket (not shown), and even if the lamination thickness specification of the stator core 3 is changed, the lamination process of the core plate 1 can be easily performed. The stator core 3 is securely fixed in one bracket 6 by controlling the height dimension of the locking part 5 (=press-insertion depth dimension into the bracket 6) to be constant.
Brackets of the same shape can be used regardless of slight changes in stacking thickness specifications.

Further, since the press-fitting work and the fixing work of the stator core 3 can be performed almost simultaneously in the pressing process, the work efficiency is good and the fixing structure can be simplified.

As explained above, according to the present invention, it is possible to obtain an electric motor in which the stator core can be easily and reliably fixed in one of the brackets.

[Brief explanation of drawings]

Figure 1 is a diagram showing the shape of the core plate, Figure 2 is a diagram showing the state in which the stator core is formed, Figure 3 is an axial sectional view showing the shape of the bracket, and Figure 4 is a diagram showing the stator core on the bracket. FIG. DESCRIPTION OF SYMBOLS 1... Iron core plate, 2... Notch, 3... Stator core, 4a, 4b... Vertical groove, 5... Locking part, 6...
... Bracket, 8... Holding part, 9... Protrusion.

Claims (1)

[Scope of utility model registration request] In an electric motor in which two bottomed cylindrical brackets are butt-fixed and a stator core is press-fitted inside, a vertical groove in the stacking direction is formed on the outer periphery by providing notches on the outer periphery of the iron core plates and stacking them. forming an upper stator core and a lower stator core;
The upper part of the stator core and the lower part of the stator core are shifted in the rotational direction so that the vertical grooves do not match, and then joined in the stacking direction to form a locking part that blocks the vertical grooves on the joint surface, and one bracket A protrusion that protrudes inward is formed at the press-inserted end, and the opening of the bracket is bent to engage with the locking part and holds the stator core between it. An electric motor characterized by forming: