JP3232464B2 - Mold motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding motor for molding a stator core by premixing or the like to form a frame.

[0002]

2. Description of the Related Art In a molding motor in which a stator core is molded by premixing, a frame is formed by premixing, and a bracket formed by drawing a steel plate is attached to the frame. ing.

[0003] A molded electric motor having such a configuration can be formed in a small size by winding a core in a toroidal shape, and is therefore preferably used for an indoor cooling device or the like.

[0004] However, there is a problem that the premixed frame and the bracket made of steel plate are incompatible with each other in terms of fixing them, and cannot be easily combined.

[0005] The problem of mounting the bracket and the frame directly affects the assembling accuracy of the stator and the rotor, and is also extremely important in the characteristics of the electric motor.

[0006] First, regarding the mounting of the bracket, as a method of obtaining sufficient mechanical strength, Japanese Patent Publication No. 63-1 / 1988 has been proposed.
As shown in No. 013, a bracket is fitted from both sides of the stator core in the axial direction, and a retaining ring is attached to the shaft of the rotor penetrating the bracket outside the bracket so that the bracket is held by the frame. There was a way to fix it.

[0007] In such a method, since the bracket is fixed to the shaft, the mechanical strength is large and the structure is simple.

However, processing for mounting the retaining ring on the shaft is necessary, and since the retaining ring approaches the bracket during assembly, the jig for mounting the retaining ring on the shaft abuts the bracket. And it was difficult to assemble.

Also, there is a structure in which a bracket is formed integrally with the frame by premixing on one of the stator cores.
When one bracket is integrated with the frame,
When the retaining ring comes into contact with the premixed frame, the retaining ring rotates together with the shaft.

Therefore, especially when one bracket is integral with the frame, the other bracket is formed of a steel plate,
It became necessary to fix it to the frame with screws.

However, screwing a screw into a premixed frame is incompatible, so that a screw is screwed into the frame or a screw is inserted from the iron core forming the stator. It was necessary to carry out such a troublesome work as to provide a hole with a screwable hole or to provide a member to which a screw can be screwed, and to integrally mold the frame with a premix.

In addition, the position at which the screw can be screwed is limited due to the relationship of the internal winding, and a simple structure such as easily forming a hole in the frame and screwing a self-tapping screw is a design constraint. There was something to receive.

Therefore, what is considered as the most rational method today is to form a screw support portion integral with an insulating layer formed on an iron core and expose the support portion to the surface of the frame when molding. An attempt has been made to form a frame and then screw a screw to this support to fix the bracket.

According to such a method, the supporting portion, which is an extension of the insulating layer, has good insulation properties with respect to the winding, and can be set at a comparatively arbitrary position without being affected by the winding.

If one side of the above-mentioned bracket is combined with the frame integrally formed by premixing, it becomes the most reasonable mold motor at present.

However, there are some problems when promoting automation by a robot or the like in assembling.

That is, even if a premixed frame is formed on the stator, at least the bearing, wave washer, rotor, bracket, and screws must be attached to the frame for subsequent assembly.

When a robot is employed for such an assembly, the bearing can be mounted on the rotor in a separate step, and the rotor on which the bearing is mounted can be mounted on a frame by the robot, Can also be mounted with a robot.

Further, screw tightening robots have become widespread today, and if the position is correct, this kind of screw can be easily assembled by the robot.

Therefore, when assembling with a robot in this way, the bearing and the bearing housing must be connected to each other in order to absorb the axial tolerance of the rotor bearing and to apply a certain preload to the bearing. Although a wave washer is inserted between them, the wave washer is a small part, and furthermore, the bearing housing is located at the bottom, and has a problem that the shape is wavy and cannot be easily mounted by a robot. I was

Even if the robot attempts to mount the wave washer on the bearing housing of the frame, the wave washer must settle down parallel to the bottom of the bearing housing.
This is often mounted diagonally so that it rests on the bottom,
Failures occurred, such as being mounted later and being crushed by rotor bearings.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a mold motor that can be reliably and easily assembled when assembled by a robot or the like.

[0023]

SUMMARY OF THE INVENTION According to the present invention, a bracket is integrally formed on one of the frames, and the other is opened to form a cup, and a cup-shaped bearing housing is integrally formed on the bottom of the bracket. The bottom portion is formed by an inclined surface that is lowered toward the bearing housing with the opening of the frame facing upward, and the bearing is formed from an outer edge of the bottom portion.
The length up to the open end of the inner diameter of the housing is
1/2 or less of the outer diameter of the wave washer attached to the inner bottom of the housing
The problem is solved by being below.

[0024]

When the wave washer placed in the frame falls to the bottom , it slides and stops at the bottom because of the inclination of the bottom and the length of the wave washer relative to the width of the bottom. Without falling into the bearing housing.

Since the wave washer that has fallen into the bearing housing is inclined together with the impact of the fall, the lower end slides and falls into the inner bottom, and becomes horizontal, and assumes a predetermined posture.

Therefore, the bearing of the rotor can be fitted to the wave washer that is accommodated in the bearing housing in a predetermined posture, and low-temperature assembly can be performed.

[0027]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a molded electric motor according to one embodiment of the present invention.

FIG. 2 is a perspective view showing the shape of the wave washer. FIG. 3 is a longitudinal sectional view of a main part showing a state when a wave washer is put into a frame.

FIG. 4 is a longitudinal sectional view of a main part showing a state where the wave washer is in a predetermined posture.

FIG. 5 is a plan view of the finished product with the bracket attached.

In FIG. 1, the mold motor includes an iron core 1
A thin insulating layer 2 is provided on the outer circumference of the device, and a toroidal winding 3 is wound on the insulating layer 2.

The outer periphery is covered by a premixed frame 4, one of which forms an integral bracket 5, and the other of which is formed with a recess 6 to form a steel plate bracket 7. Are fitted so that the screw 8 can be fixed by fitting as shown by the arrow.

Further, the brackets 5 and 7 are provided with a rotor 9 via bearings 9a and 9b, respectively, and a slight gap 11 is formed between the rotor 9 and the stator 10. I have.

When the bracket 7 is fixed to the frame 4 by screws 8, the support portions 12 formed integrally with the insulating layer 2 can screw the screws 8, and screw the screw 8 to the support portions 12. Thus, the bracket 7 can be firmly fixed to the concave portion 6 of the frame 4.

The concave portion 6 of the frame 4 is configured such that the outer diameter side abuts against the outer diameter side of the bracket 7, and is tapered so that the abutment does not make the fitting of the bracket 7 and the frame 4 difficult. 13 are formed.

The screw 8 is formed of a tapping screw, the supporting portion 12 is integrally formed of a resin forming the insulating layer 2, and the screw 8 formed of the tapping screw is easily screwed by a screw tightening robot. It is configured to be compatible. In addition, the shape of the frame 4 is such that one bracket 5 is formed integrally with the frame 4 and the other is open, so that the frame 4 is formed in a cup shape with the opening facing upward. The bearing housing 1
4 are formed, and a wave washer 16 is mounted on the inner bottom thereof.

In FIG. 2, the wave washer 15 is formed in a donut shape, is deformed in a wave shape, and has elasticity.
It is configured to be crushed by being pressed by the bearing 9b.

In FIG. 3, the molded motor has a frame 4 formed in a cup shape, and a bottom portion 16 is inclined toward the bearing housing 14.

A wave washer 15 is erected on the inclined bottom 16, and the angle of inclination formed between the wave washer 15 and the bottom 16 is about 30 degrees and 40 degrees. It is as follows.

The wave washer 14 mounted on the inner bottom 17 of the bearing housing 14 is similar to the wave washer 1 on the bottom 16.
5 shows a state where it has dropped into the bearing housing 14.

In FIG. 4, the wave washer 15 which falls from the bottom 16 of the frame 4 to the inner bottom 17 of the bearing housing 14 is shown.
The inclined portion 18 is formed so as to have an inclination A of about 30 degrees with respect to the inner bottom 17 and not more than 40 degrees.

In FIG. 5, the mold motor has a bracket 7 fitted to a frame 4 and assembled with screws 8.

In such a configuration, the molded motor forms an insulating layer 2 on an iron core 1, winds a winding 3, and forms a frame 4 by premixing.

Then, it is placed on a conveyor or the like (not shown) with one of the brackets 5 facing down in a cup shape and transported on an assembly line.

When the wave washer 15 is inserted into the frame 4, the wave washer 15 first collides with the bottom portion 16, and there is a possibility that the wave washer 15 stops at this portion.

Considering various possible postures, first, when parallel to the bottom, unless the length of the bottom 16 is not less than 1/2 of the wave washer 15, as shown in FIG. Will fall.

The wave washer 15 is mounted on the bearing housing 14.
In the case of falling, the vicinity of the axis of the inner bottom portion 17 of the bearing housing 14 is constituted by the inclined portion 18, and the angle with the wave washer 15 is about 30 degrees or less than 40 degrees.

For this reason, the lower end of the wave washer 15 fits in the horizontal position on the inner bottom portion 17 of the bearing housing 14 so as to slide forward.

Next, when the wave washer 15 falls on the bottom 16 at a right angle to or close to the bottom 16, the wave washer 15 can hardly stand vertically.
As shown in FIG.
It becomes a posture that leans toward.

However, in this case, the bottom 16 and the washer 15
Is about 30 degrees or less than 40 degrees, and the tip of the wave washer 15 slips and falls into the bearing housing 14.

As described above, the wave washer 15 fits in the bearing housing 14 in a horizontal posture.

Therefore, when the wave washer 15 is set in the inner bottom 17 of the bearing housing 14 in a horizontal position, the bearing 9
Rotor 10, bracket 7, screw 8 with b attached
In this process, since the size of the parts increases, and the existing technology precedes, the robot can be easily and automatically assembled automatically.

Therefore, the wave washer 15 is set in the inner bottom portion 17 of the bearing housing 14 in a predetermined posture only by being put into the frame 4, and the automation of assembly is greatly advanced.

According to an experiment, if the wave washer 15 is stopped at the bottom 16 or the like, if a small vibration is applied to the frame 14, a predetermined action is promoted by the vibration.
If the angle is within 0 degree, the tip of the wave washer 15 will surely slide forward.

This is because there is a physical phenomenon that when a long object such as a rod is erected on a horizontal plane, the tip of the rod slides at an angle of 30 degrees or less with respect to the horizontal plane. In the actual assembly of the mold motor, vibrations and the like occur, and the horizontal surface is further inclined, so that the wave washer 15 becomes slippery. If the inclination is 40 degrees or less, the phenomenon can be used almost certainly. It is.

[0056]

According to the present invention, when the wave washer is inserted into the frame, it can be automatically slid to be mounted on the bearing housing, which is extremely effective for robotizing the assembly and making the assembly line unmanned. It has a great effect toward

[Brief description of the drawings]

FIG. 1 is a half sectional view of a mold electric motor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a shape of a wave washer.

FIG. 3 is a longitudinal sectional view of a main part showing a state when a wave washer is put into a frame.

FIG. 4 is a longitudinal sectional view of a main part showing a state where a wave washer is in a predetermined posture.

FIG. 5 is a plan view of a completed product to which a bracket is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Iron core 2 ... Insulating layer 3 ... Winding 4 ... Frame 14 ... Bearing housing 15 ... Wave washer 16 ... Bottom 17 ... Inner bottom

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 5/16-5/173 H02K 5/08

Claims (1)

(57) [Claims] 1. A molded motor in which a frame is formed by molding an outer periphery of an iron core of a stator by premixing, wherein a bracket is integrally formed on one of the frames and a cup is formed by opening the other. A cup-shaped bearing housing is integrally formed at the bottom of the bearing housing, and the bottom is configured with an inclined surface that is lowered toward the bearing housing with the opening of the frame facing upward. Open inner diameter
The length up to the mouth end is attached to the inner bottom of the bearing housing
A molded electric motor having a diameter equal to or less than 1/2 of an outer diameter of a wave washer to be formed .