JPS6084935A - Motor - Google Patents

Abstract

PURPOSE:To readily and reliably assemble a motor by forming projections projected inward from one frame and forming notches at the other frame. CONSTITUTION:A bent portion 9 by a notch is formed near the end of a stator core 3 at one frame 1, and a projection 10 is formed near the end of the core 3 at the other frame 2. The portion 9 is bent to intrude into the corner of one end face 12 of the core 3. The projection 10 is formed to project inward by bending part of the frame 2 inward, and the end is contacted with the other end face 13 of the core 3. Thus, the core can be readily fixed to the frame.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of an electric motor that can be assembled easily and reliably.

Although the motor stator and frame are assembled in a simple structure, because the stator core is made of a thin steel plate made of a Vi layer, the position of fixing it to the frame is not exactly uniform, and it is necessary to fix it in advance. It was difficult to set the bottle holes etc.

For this reason, the means for fixing the frame and the stator core were designed so that the holes could be drilled after assembly, so that machining tolerances would not be a problem when the bottle was inserted.

However, such an assembly method requires very little machining, and if holes are made with a drill after assembly, chips may enter the internal windings or rotating parts.
Quality problems could not be avoided.

An object of the present invention is to solve such problems and provide an electric motor that is easy and reliable to assemble.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings. Fig. 1 is a longitudinal sectional view of an electric motor showing an embodiment of the present invention, and Fig. 2 is an enlarged view of the main parts thereof. It is a diagram.

In FIG. 1, the electric motor is assembled such that a bracket 1.2, which is formed into a cylindrical shape by drawing a steel plate using a press, has its ends abutting each other.

A stator core 3 is installed inside the bracket 1.2, and a winding 4 is applied to the stator core 3.
A rotor 5 is installed so as to rotate inside.Furthermore, the rotor 5 is provided with a support 6, and a bearing portion 7 formed at each axis of the frame 1.2. 8
is supported by.

In the frame 1.2, a curved portion 9 is formed by bending one frame 1, and a positioning projection 10 is formed on the other frame 2, each of which abuts on the stator core 3.

A flange 71 is formed at the open end of the frame 1.2 and abuts against it.

In FIG. 2, the electric motor has a bent portion 9 formed by a notch near the end of the stator core 3 of one frame 1.
On the other frame 2, a protrusion 10 is formed near the end of the stator core 3.

The bent portion 9 is bent so as to bite into a corner of one end surface 12 of the stator core 3.

Further, the protrusion 10 is formed so as to bend a part of the frame 2 inward and protrude inward, and its end abuts the other end 13 of the stator core 3.

In such a configuration, the electric mIJ and the frame 1.2 are drawn and formed by a press, and the curved portion 9 is formed on one frame 1 and the protrusion 10 is formed on the other frame 2, and the frontage end of the frame 1.2 is formed. The stator core 3 is sandwiched inside so that they abut each other.

Then, when the stator core 3 is pressed against the frame 1.2 by a press or the like, the frame 1.2 is pressed against the frame 1.2.
The stator core 3 is inserted inside the stator core 3.

When the stator core 3 is installed inside the frame 1.2 in this manner, one end surface 12 of the stator core 3 collides with the curved portion 9 and the other end surface 13 collides with the protrusion 10, causing the stator core 3 is placed in a predetermined position U of frame 1.2.

Then, the stator core 3 is deformed so that the bent portion 9 is strongly bent inward from the outer periphery of the frame 1.

When the curved portion 9 is deformed in this manner, the curved portion 9t bites into the corner of one end surface 12 of the stator core 3, and the stator core 3 is rotated and axially rotated relative to the frame 1. Movement will be restricted.

Moreover, according to such a method, if the curved portion 10 and the protrusion 10 are formed by notches in the frame 1.2, the fixing of the stator core 3 can be easily formed, so that processing and assembly is extremely easy. Become.

Moreover, even if the lamination m of the steel plates of the stator core 3 changes slightly, the curved portion 9 is strong (if bent, it will definitely bite strongly into one end surface 12 of the stator core 3, There is no need to worry about tolerances, and assembly can be performed reliably.

The protrusion 10 formed on the other frame 2 may simply come into contact with the other end 13 of the stator core 3 to determine its position in the axial direction, as has been conventionally done.

Of course, the protrusions 10 do not have to be limited to such a structure, as long as they prevent the stator core 3 from moving (However, as a structure that can be easily machined using a press, The structure of this example is particularly preferred.

It is sufficient to have such a protrusion 10J3 and bent portion 9 at one location on the outer periphery of the frame 1.2, but they may be arranged in several locations to obtain the necessary mechanical strength. The width in the circumferential direction can be set arbitrarily; the larger the width, the greater the mechanical strength.

In addition, deformation due to bending of the curved portion 9 can be done using a sharp tool such as a dry saw, but it is also possible to deform the curved portion 9 by using the through hole in the frame 1 formed to form the curved portion 9 as a guide. Target 3! ! ! It is also possible to do so.

Then, mechanical processing is performed using the through hole forming the curved portion 9 as a guide.
! I! In this case, automatic assembly by an assembly machine becomes possible, which is extremely convenient for mass production of small electric machines.

As described above, according to the present invention, the stator core can be easily fixed to the frame, and the assembly time, parts, and processing conditions are extremely convenient, and it is extremely effective, especially when producing small electric motors. Power\Big.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention! 1' is a vertical sectional view of the electric motor, and FIG. 2 is an enlarged view of the main parts thereof. 1.2...Frame, 3...Stator core, 9.
...Curved portion, 10...Protrusion, 12...One end surface, 13...The other end surface. Special Y [Applicant Shibaura Seisakusho Co., Ltd. 1 2nd concave

Claims (1)

[Claims] A cylindrical frame is formed from a steel plate, and a stator core is placed inside the frame so that the ends abut against each other. One frame is provided with protrusions that protrude inward to position the stator core, and the other An electric motor characterized in that a notch is formed in the frame of the frame, and the bent part is bent so as to bite into the stator core.