JPH09247885A - Motor with leg - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor at a low cost which is able to maintain a high accuracy for a leg mounting area even through the influence of thermal deformation is given be connecting and fixing a frame and mounting legs together after a part of frame of the main body of the motor is arched to a stator by shrinkage fitting. SOLUTION: A frame 4a and mounting legs 11a are separated from a motor, the frame 4a is attached to a stator 6 by shrinkage fit, the mounting foot 11a is connected to the frame 4a with an bolt 13, the frame 4a as a part of the main body of the motor is provided with fines for enhancing heat radiating effect in the outer peripheral axis direction, and a screw hole for the bolt 13 is provided. Also, it is made of an aluminum alloy and can be produced with a extrusion die or die-cast molds, and a function of a whirl stop is provided for connecting and fixing part of a fin shape in alignment with the shape of the mounting leg 11a. A hole for inserting the body 13 for fixing to the main body of the motor is provided in the mounting leg 11a, and a through-hole for attracting to other equipment is provided in the mounting surface 12a. As a result, a motor having legs attached with a high leg mounting accuracy can be obtained at a low cast.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foot-mounted electric motor used in all industrial fields.

[0002]

2. Description of the Related Art In recent years, in response to market demands for downsizing and weight reduction of electric motors, a frame made of an aluminum alloy, which is lightweight and has excellent heat dissipation characteristics, has been increasingly used.

A conventional foot-mounted electric motor will be described below with reference to FIGS. 2 and 3. 2A is a half sectional view of a conventional foot-mounted electric motor (hereinafter referred to as an electric motor), FIG.
(B) shows a right side view.

In FIG. 2, 1 is a shaft of an electric motor, 3 is a ball bearing press-fitted into the shaft 1, 2 is a bracket for holding the ball bearing 3, 5 is a rotor fixed to the shaft 1, and 6 is a rotor 5. The stator is provided at a position facing each other, and includes a stator core 8 and a winding 7 that generates a magnetic field in a gap between the stator 6 and the rotor 5 when a current flows. 4 is a frame made of an aluminum alloy that mounts the stator 6 inside and radiates the heat generated by the loss of the electric motor, 9 is a fan fixed to the shaft 1, 10 is a fan cover fixed to the bracket 2, and 11 is Mounting feet for mounting the electric motor, and 12 are mounting surfaces of the mounting feet 11. When the stator 6 having the stator core 8 made of an electromagnetic steel plate on the outer side in contact with the frame 4 is mounted on the frame 4 made of an aluminum alloy having a higher thermal expansion coefficient than steel, a gap between the stator 6 and the frame 4 is In order to increase the holding power, the frame 4 is heated and fitted onto the stator 6 by shrink fitting. The mounting foot 11 has an integral structure with the frame 4. Alternatively, the mounting foot 11 is brazed to the frame 4 as shown in Japanese Utility Model Laid-Open No. 7-3258 (FIG. 3A, a partially exploded side view of the electric motor, and FIG. 3B, a partial perspective view of the frame). It is used to fix the electric motor in place using the mounting holes provided in 11.

The electric motor is a device for generating an electromagnetic force by a current induced in the rotor 5 by a magnetic field excited in the gap, giving a rotating force to the shaft 1 and transmitting the power to a load,
The fan 9 directly connected to the shaft 1 generates wind by the rotation of the shaft 1. The wind flows through the gap with the fan cover 10 and contributes to heat dissipation of heat generated by the loss of the electric motor transmitted from the stator 6 through the surface of the frame 4.

[0006]

However, in the above-mentioned conventional configuration, when the frame is heat-fitted to the stator, the frame is thermally deformed, and the mounting feet integrally formed with the frame or the mounting feet brazed to the frame, There is a problem in that the accuracy (flatness) of the mounting surface of the mounting foot cannot be maintained, and a step of machining the mounting surface of the mounting foot is required after the frame is shrink-fitted and mounted on the stator.

The present invention solves the above-mentioned problems of the prior art. Even if the frame, which is a part of the motor body, is shrink-fitted and is affected by thermal deformation after mounting, the foot can maintain the mounting surface accuracy of the mounting foot. An object is to provide a mounted electric motor at low cost.

[0008]

In order to achieve this object, in a foot-mounted electric motor of the present invention, the frame and the mounting foot are separated, and the frame, which is a part of the electric motor main body, is fitted to the stator by shrink fitting. After that, it has means for connecting and fixing the frame and the mounting foot.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is an electric motor main body having a frame, which is a part of the electric motor main body, mounted and mounted on a stator by shrink fitting, and an outer periphery of the frame of the electric motor main body. Attached to and fixed to another,
It is a foot-mounted type electric motor including means for connecting and fixing the electric motor main body and the mounting foot, and it is said that the mounting surface accuracy of the mounting foot can be maintained without requiring machining after mounting the mounting foot. Have an effect.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 1A is a half sectional view of a foot-mounted electric motor according to an embodiment of the present invention, FIG.
(B) shows a right side view. In FIG. 1, the same components as those in the conventional example are denoted by the same reference numerals as those in the conventional example, and the description thereof will be omitted.

The difference between the embodiment and the conventional example is that the frame 4
a and the mounting foot 11a are separated, the frame 4a is fitted onto the stator 6 by shrink fitting, and then the mounting foot 11a is attached to the frame 4a by the bolt 1
That is, it was connected and fixed at 3.

The frame 4a, which is a part of the electric motor main body, is provided with fins for enhancing the heat radiation effect in the axial direction of the outer periphery, and screw holes for the bolts 13 are provided. Also, it can be made of an aluminum alloy with an extrusion die or a die casting die, and a part of the fin shape is adjusted to the shape of the mounting foot 11a,
It has a function to prevent rotation when connecting and fixing. The mounting foot 11a is provided with a hole through which the screw of the bolt 13 fixed to the electric motor body passes, and the mounting surface 12a is provided with a through hole for mounting to another device.

As a means for connecting and fixing the motor body and the mounting foot, the mounting foot 11a is fixed to the frame 4a by the bolt 13.
However, as the means for connecting and fixing the motor body and the mounting foot, any method that does not heat such as adhesion, pins, rivets, and caulking may be used.

Further, by separating the frame 4a and the mounting foot 11a, the frame 4a can be used for an electric motor having no mounting foot, so that the cost can be further reduced by sharing the parts.

[0015]

As described above, according to the present invention, there is provided a foot-mounted electric motor having a high mounting surface accuracy (flatness) of the mounting foot even when the frame, which is a part of the electric motor main body, is affected by thermal deformation. Therefore, the step of reworking the mounting surface of the mounting foot after completion of assembly is eliminated, and the foot-mounted electric motor can be provided at low cost.

[Brief description of drawings]

1A is a half sectional view of a foot-mounted electric motor according to an embodiment of the present invention, and FIG. 1B is a right side view of a foot-mounted electric motor according to an embodiment of the present invention.

FIG. 2A is a half sectional view of a conventional foot-mounted electric motor. FIG. 2B is a right side view of a conventional foot-mounted electric motor.

3A is a partially exploded side view of a conventional foot-mounted electric motor, and FIG. 3B is a perspective view of a conventional frame portion.

[Explanation of symbols]

 1 axis 2 bracket 3 ball bearing 4, 4a frame 5 rotor 6 stator 7 winding 8 stator core 9 fan 10 fan cover 11, 11a mounting foot 12, 12a mounting surface 13 bolt

Claims (1)

[Claims] 1. A motor main body in which a frame, which is a part of the electric motor main body, is mounted and mounted on a stator by shrink fitting, mounting legs that are mounted on the outer periphery of the frame of the electric motor main body, and are fixed to another, and the electric motor main body. A foot-mounted electric motor comprising: a means for connecting and fixing the mounting foot.