JPH03190543A - Frame device of motor - Google Patents

Abstract

PURPOSE:To make the space between a stator inside diameter and a rotor uniform by using the inside diameter the standard of motor assembly in setting the end bracket as a frame device in the inside diameter of the stator. CONSTITUTION:A shaft 11 is pierced through the center of a rotor 10, and this shaft 11 is beared through a bearing 12 freely in rotation by the bearing part 15 of an end bracket 14 forming the frame device 13 of a motor 1. Moreover, a setting part 17 with the inside diameter 2 is made to accord with the inside diameter 2 of a stator 8 or to be a little larger than it at this bearing part 15. And this part is fit and fixed to the inside diameter by bonding. In this way, the setting part 17 of the frame part 13, releasably supporting the rotor 10 through the bearing 12, is fit and fixed to the inside diameter on the basis of the inside diameter 2 of the stator 8, so the concentricity between the rotor and the stator can be obtained accurately. For this reason, a motor with small electric vibration and noise can be obtained.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention can be used by incorporating into various types of equipment.
This invention relates to a frame device corresponding to an outer frame of a motor that supports the bearing of a small electric motor of W or less and protects the coil end.

[Conventional technology]

In order to simplify the structure of a small electric motor that is used as part of a device, the frame device that serves as the outer frame of the electric motor has a U-shaped cross section called an end bracket. Fit it onto the outer diameter of from both end faces,
The rotor is rotatably supported by providing a bearing in the center of the end bracket, and the end bracket is brought into contact with both end surfaces of the stator and fixed to the stator there.

In such a method, manufacturing errors cannot be avoided between the stator inner diameter and the stator outer diameter, and coaxiality between the stator inner diameter and the outer diameter is not always satisfactory. Therefore, assembling the electric motor based on the outer diameter of the stator results in an error in coaxiality between the rotor supported by the end bracket and the inner diameter of the stator facing the rotor. The air gap between the stator inner diameter and the rotor is 0.15 to 0.
It is small, about 35cm, and if it goes out of order due to an error in coaxiality, it will cause unevenness in the gap length, which will lead to magnetic imbalance between the stator and rotor, causing electromagnetic vibration and noise. What happens next is well known.

In addition, the conventional end bracket structure in which the end bracket surrounds the entire coil end portion of the stator requires a large amount of material to form it, resulting in an increase in material cost, an increase in the mass of the motor, and an increase in the coil end. Dissipation of heat was also often an obstacle.

[Problem to be solved by the invention]

In the present invention, it is necessary to equalize the air gap between the inner diameter of the stator and the rotor, which causes electromagnetic vibration and noise of the electric motor, and for this purpose, the coaxiality between the stator and rotor is The goal is to improve.

Another objective is to save the material used to form the motor frame, which includes avoiding completely enclosing the motor stator. For electric motors that are built into devices, the parts corresponding to the outer frame and outer cover of the device itself achieve their purpose with the outer cover and frame of the device itself, so the outer cover and frame of the motor itself can be greatly simplified. There is no problem.

[Means to solve the problem]

To achieve the above objectives, the inner diameter of the stator of the electric motor is used as a reference for assembling the electric motor. To achieve this, an end bracket that rotatably supports the rotor with a bearing serves as the frame of the electric motor, and is fitted and fixed at the stator inner diameter, so that the stator inner diameter can be used as a reference for assembling the motor. This is to eliminate any room for coaxiality errors in the outer diameter. If this method is adopted, the dimensional accuracy of the frame device consisting of the rotor and end bracket can be increased, and if eccentricity etc. are eliminated, the gap length between the stator inner diameter and the rotor will be constant over the entire circumference, and the electromagnetic Since no imbalance occurs,
This makes it possible to prevent electromagnetic vibration and noise.

It is essential for the function of the frame device of an electric motor, that is, the end bracket that forms the outer cover. By simply providing the bearing portion, the fitting portion that fits and secures the inner diameter of the stator, and the overhanging portion that protects the coil end portion of the stator coil, the material used to form the end bracket can also be saved.

If the rotor is supported by the two end brackets thus formed and the fitting part is fitted and fixed to the inner diameter of the stator,
This completely satisfies the function of an electric motor, and makes it possible to save resources and materials.

[Effect]

As mentioned above, uniformity of the gap size due to improved coaxiality between the stator inner diameter and the rotor is achieved because the magnetic resistance between the stator and rotor is made uniform over the entire circumference of the stator inner diameter. There are no fluctuations in magnetic resistance due to the rotation of the rotor, and only periodic magnetic fluctuations due to the slots formed in the stator and rotor occur, and electromagnetic stress due to uneven air gap length due to eccentricity due to decreased coaxiality is eliminated. The need for photography is eliminated.However, electromagnetic vibrations and noise caused by electromagnetic excitation force are no longer generated.

The end bracket as a frame device has a bearing part in the center, and a plurality of legs are formed radially from there. Two or more of these legs are used as fitting parts with the inner diameter of the stator, and the rest are used to protect the coil ends. It can be used as an overhang, and part of it can be used as a member for mounting the electric motor.By doing this, it can be easily formed by pressing a rectangular plate, for example, and the end bracket material can be saved significantly. It is possible.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

In the figure, reference numeral 1 denotes an electric motor, the inner diameter 2 is formed along a plurality of slots 3 with a circumferential locus, and the stator core 5 has an outer diameter 4 formed with at least a part of the circumferential locus on the outer circumferential side.
is formed with a predetermined thickness in the axial direction of the electric motor 1.

A stator coil 6 is wound around the slot 3 , and a coil end 7 is formed at a portion of the stator coil 6 that protrudes from the slot 3 . This becomes the stator 8 that constitutes the next side.

0.15 to 0.35 for the circumferential locus of the inner diameter 2 of the stator 8
A rotor 10 forming the secondary side of the electric motor 1 having a circumferential outer diameter is disposed opposite to each other with a small gap 9 of m. A shaft 11 for supplying mechanical power to the outside as an electric motor 1 is fixed through the center of the rotor 10.
1 is rotatably supported by a bearing portion 15 of an end bracket 14 forming a frame device 13 of the electric motor 1 via a plurality of bearings 12 . The end bracket 14 may be formed by pressing a plate-shaped material, and the end bracket 14 may be formed by pressing a plate-shaped material.
5, a plurality of leg portions 16 are extended in the outer circumferential direction, and at least two or more of the leg portions 16 are
It is bent in the axial direction of the electric motor 1 so that its outer diameter matches or is slightly larger than the inner diameter 2 of the stator 8 to form a fitting part 17 with the inner diameter 2, and this part is fitted to the inner diameter 2 by gluing or the like. It is meant to be fixed together. The remaining leg portions 16 are extended in the outer diameter direction to form an overhang portion 18 for protecting the coil end 7 from external force. Two frame devices 13 thus formed are used with the rotor 10 sandwiched in the center, and in both cases the fitting portion 17 is connected to the inner diameter 2 of the stator 8.
The electric motor 1 is formed by fitting and fixing the electric motor 1 into the electric motor 1.

(Effects of the Invention) According to the present invention, the fitting portion 17 of the frame device 13 that rotatably supports the rotor 10 via the bearing 12 is fitted to the inner diameter 2 of the stator 8. Because of the fixed fixation, the coaxiality between the rotor 10 and the inner diameter 2 of the stator 8 can be maintained with high precision.

Unlike the conventional method of assembling based on the outer diameter 4 of the stator 8, the coaxiality error between the inner diameter 2 and outer diameter 4 of the stator 8 is not added, and the uniformity of the air gap 9 reduces electromagnetic vibration and noise. A smaller number of electric motors 1 can be obtained.

In addition, the frame device 13 has a central bearing portion 15 and leg portions 16 extending from the central bearing portion 15 in the outer circumferential direction. Only the portion 18 is required, less material is needed to form it, less material is needed to manufacture the frame device 13, and the efficiency in terms of resource saving is high.

Furthermore, since the stator 8 of the electric motor 1 is not surrounded by a frame and is in an open state, heat dissipation of the heat generated by the stator coil 6 is good and temperature rise can be kept low.
It is also possible to extend the life of the electric motor 1.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of an electric motor according to an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a perspective view of a frame device which is a main part of the present invention. 1... Electric motor, 2... Inner diameter, 3... Slot, 4
...Outer diameter, 5...Stator core, 6...Stator coil, 7...Coil end, 8...Stator, 9...
, air gap, 10... rotor, 11... shaft, 12...
Bearing, 13... Frame device, 14... End bracket, 15... Bearing portion, 16... Fig. 1 Fig. 2 Fig. Fig.

Claims (1)

[Claims] 1. A stator (8) whose inner diameter (2) is a circular locus, this inner diameter (
2) and a rotor (10) disposed opposite to each other across a gap (9). It has a fitting part (17) formed by bending at least two of the separately formed leg parts (16) in the axial direction of the electric motor (1) to be fitted and fixed to the inner diameter (2), and the remaining legs (1
6) is extended in the outer circumferential direction and attached to the coil end (7).
An electric motor characterized in that an end bracket (14) provided with an overhang (18) for protecting the stator (8) is fitted and fixed to the inner diameter (2) from both axial end faces of the stator (8). Frame device.