JPS6223229Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor that prevents stator cores from slipping or coming off and that has a reduced external dimension.

The structure of the frame and bracket of a conventional electric motor will be explained with reference to FIGS. 1A and 1B.

A is a view seen from the direction of arrow A in B, and B is a view of X- in A.
A cross-sectional view taken along the X′ line is shown.

In the figure, 1 is the bracket, 2 is the frame,
3 is a stator core, and 4 is a bracket mounting screw, which is fixed to the frame 2 by the bracket mounting screw 4.

P is the coil end, Q is the lead wire, R is the rotor,
S represents the motor shaft, T represents the ball bearing, and U represents the wave-shaped thrust washer.

The disadvantage of conventional electric motors is that, as shown in Figure 1 A and B, the stator core 3 does not shift toward the shaft end and is not prevented from coming off, so the stator core 3 may shift from the frame 2 during operation, transportation, etc. , or the function of the motor will be damaged.

Furthermore, since the bracket mounting screws 4 are located on the outside, the outer diameter becomes larger. Therefore, in order to prevent the stator core from falling off toward the shaft end side due to a fall, etc., it is possible to prevent the stator core from falling off toward the shaft end side by using a set screw 5 as shown in FIG. 2A and B. A shows a view of B as viewed from the direction of arrow B, and B shows a cross-sectional view of A taken along the Y-Y' line.

This structure has the disadvantage of being extremely expensive because it requires threading on the stator core and set screws.

The present invention solves the conventional drawbacks, and the frame is provided with a plurality of fitting parts, each of which has a notch, and the bracket has a mounting part at a position corresponding to the notch. An end face part is formed at one end inwardly from the end edge part, and a concave part is provided that is concave to the surface in the direction of the axis of the motor and parallel to the axis, and is fixed inward to the lower part of the fitting part of the frame. A recessed stepped portion is provided for inserting the child core, the stator core is inserted into the stepped portion of the frame, and the bracket recessed portion is inserted into the notch of the frame fitting portion to fit the bracket to the frame. The stator core housed inside is clamped between the stepped part of the frame and the end face of the recessed part of the bracket, the bracket is fixed to the frame by the end face, and the bracket mounting part is brought to the axis of the motor. The purpose of this invention is to reduce the external dimensions of the motor, reduce the material costs of the frame and bracket that make up the motor, improve reliability against misalignment and pull-out of the stator core, and obtain a motor that is inexpensive. do.

The electric motor of the present invention will be described below with reference to the embodiments shown in FIGS.

Fig. 3A is a front view of the upper half of the embodiment of the present invention seen from the direction of arrow c in Fig. 3B, Fig. 3B is a sectional view taken along line D-O in Fig. 3A, and Fig. 3C is the same. A sectional view taken along the line E-O, and D shows a view of the frame viewed from the direction of the arrow C.

In FIGS. 3A, 3B, and 3C, 3 represents a stator core, as in FIGS. 1A and 1B and FIGS. 2A and 2B.

6 is a frame, 6A is a fitting part, 6B is a notch part, 7 is a bracket, 7A is a recessed part, and 8 is an end face part which becomes a mounting part by a screw or the like. frame 6
A fitting portion 6A into which the bracket 7 is fitted is provided, and a notch portion 6B is provided at a predetermined position of the fitting portion 6A.
The bracket 7 is provided with a recessed portion 7A corresponding to the cutout portion 6B, and an end surface portion 8 is provided at the tip of the recessed portion 7A.

To fix the bracket 7 to the frame 6, the bracket 7 is fitted into the fitting part 6A of the frame 6, with the recessed part 7A of the bracket 7 corresponding to the notch part 6B of the fitting part 6A. At this time, the stator core 3 is secured in the frame 6 because both end surfaces of the stator core 3 are held between the stepped portion 6-1 of the frame 6 and the end surface portion 8 of the recessed portion 7A of the bracket 7. Ru. Then, the bracket 7 is fixed to the frame 6 using a mounting screw 9 or the like at the end face 8 provided in the recessed part 7A.

As is clear from the above description, according to the present invention, one end of the stator core in the axial direction is held by the end face of the recessed part of the bracket, and the other end face is held by the stepped part 6-1. This prevents the stator core from shifting or coming off in the thrust direction due to operation, transportation, dropping, etc., and an end surface that serves as a bracket mounting portion is provided in the recessed portion of the bracket end surface, and a notch is provided at the fitting portion of the frame with the bracket. By providing a section and bringing the bracket mounting screw toward the inner shaft center, the external dimensions of the motor can be reduced, the material costs for the frame and bracket that make up the motor are reduced, and reliability against drops is improved. This results in advantages such as an electric motor that is both flexible and inexpensive in terms of cost.

[Brief explanation of the drawing]

Figure 1A is a front view of a conventional electric motor as seen from the direction of arrow A in Figure 1B, Figure 1B is a sectional view taken along line X-X' in Figure 1A, Figure 2 is an improved version of Figure 1, A is a front view seen from the direction of arrow B in B, B is a sectional view taken along Y-Y' line in A, FIG. 3 is the electric motor of the present invention, A is an arrow C in B
B shows a cross-sectional view taken along line D-O in A, C shows a cross-sectional view taken along line E-O in A, and D shows a view of the frame seen from the direction of arrow C in FIG. 3: Stator core, 6: Frame, 6A: Fitting portion, 6B: Notch portion, 7: Bracket, 7A: Recessed portion, 8: End surface portion.

Claims (1)

[Scope of utility model registration request] The frame is provided with a plurality of fitting parts, and each of the fitting parts is provided with a notch, while the bracket has an end face part at one end located inwardly from the end edge that becomes the mounting part at a position corresponding to the notch. a concave portion that is concave to the surface in the direction of the axis of the electric motor and parallel to the axis; a recessed step portion for inserting the stator core inward at the lower part of the fitting portion of the frame; Insert the stator core into the stepped portion of the frame, insert the bracket recess into the notch of the frame fitting portion, fit the bracket to the frame, and insert the stator core stored inside the frame into the stepped portion of the frame. and the bracket is clamped by the end face of the recessed part of the bracket, and the bracket is fixed to the frame by the end face.