JPH08336253A - Open type induction motor - Google Patents

Abstract

PURPOSE: To obtain an open type induction motor which can deal with shortening of assembling lead time and short delivery schedule by clamping a stator and a rotor by means of load side and counter load side brackets and then welding the brackets and a base thereby supporting the motor body. CONSTITUTION: A bracket 2a holds a counter load side ball bearing 7a press fitted to a shaft la while a bracket 3a holds a load side ball bearing 8a press fitted to the shaft la and a wind hole 12a is made in the end face of each bracket. The brackets 2a, 3a are secured to the outer circumference of a stator 6a by means of through bolts 4a. The stator 6a is disposed oppositely to a rotor 5a secured to the shaft la. A fan 11a is formed on the rotor by aluminum diecast. A base 13a is welded to the bracket 3a and supports the motor body. In such a motor, the structure is simplified by welding the base 13a to the bracket 3a and the shortening of delivery can be dealt with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base type open type induction motor having a simple structure and a reduced size and weight. In particular, the structure of the open type induction motor is such that the outer circumference of the stator of the motor is exposed to the outside. It is about.

[0002]

2. Description of the Related Art Due to the market demand for standard open-type induction motors that are smaller and lighter and have a shorter delivery time, a simple structure that takes into account the assembly lead time of base-type open-type induction motors is becoming important. It is in.

A conventional open type induction motor will be described below. FIG. 2 is a sectional view of a conventional open type induction motor (hereinafter referred to as an electric motor).

In FIG. 2, reference numeral 1 is a shaft of an electric motor, and 7 is a shaft 1.
Of the anti-load side ball bearing press-fitted to the anti-load side of the shaft 1, 8 is the load side ball bearing press-fitted to the load side of the shaft 1, 2 is the anti-load side ball bearing 7
Brackets 3 for holding the load side ball bearings 8 for holding the load side ball bearings 8
Is a through bolt for fixing the bracket A3 and the bracket B2, 5 is a rotor fixed to the shaft 1, 6 is a stator provided at a position facing the rotor 5, 9 is a frame for fixing the stator 6, and 10 is a current flow A coil for generating a magnetic field in the gap between the stator 6 and the rotor 5 by this, 11 is a casting fan formed in the aluminum die casting of the rotor 5, 12 is an air hole formed on the circumference of the frame 9, 13 is a frame 9 is a base fixed by welding. The electric motor is a device that generates an electromagnetic force by a current induced in the rotor 5 by a magnetic field excited in the gap, applies a rotational force to the shaft 1 and transmits the power to a load.

[0005]

However, in the above-mentioned conventional structure, since the frame and the base of the electric motor are fixed by welding, the production is started from the welding process of the frame, the source process is frequently changed, and the manufacturing is confused. Invite.
Also, in order to ensure the quality of the electric motor, the frame part where the bracket is fitted must be cut based on the inner diameter of the stator in the assembly process, and the assembly lead time becomes long, and it is difficult to deal with short delivery times due to confusion in the source process. I had a problem.

The present invention solves the above-mentioned problems of the prior art. By eliminating the frame and welding the bracket and the base, the parts can be stocked, and the complexity of changing the frame cutting process based on the stator inner diameter due to model change can be avoided. It provides a base type open-type induction motor that can reduce assembly lead time and quick delivery.

[0007]

In order to achieve this object, an electric motor according to the present invention has a structure in which a stator / rotor is sandwiched and held by load-side / anti-load-side brackets, and the bracket and the base are welded to form a motor main body. I support you.

[0008]

With this configuration, the lead time for assembling the electric motor can be shortened, and the simple structure of the electric motor is provided, which greatly contributes to quick delivery without causing confusion in manufacturing.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1a is a shaft of an electric motor, 7a is an anti-load side ball bearing press-fitted to the anti-load side of the shaft 1a, 8a is a load side ball bearing press-fitted to the load side of the shaft 1a, and 2a is an anti-load side ball bearing. Brackets B and 3a, which hold the load side ball bearings 7a and have air holes on the end surfaces, are brackets A and 4a, which hold the load side ball bearings 8a and have air holes on the end surfaces, are through holes that fix the brackets A3a and B2a to the outer circumference of the stator. Bolts 5a are rotors fixed to the shaft 1a, 6a is a stator provided at a position facing the rotor 5a, and 10a is a coil for generating a magnetic field in the gap between the stator 6a and the rotor 5a when current flows, 11a Is a casting fan formed on the aluminum die casting of the rotor 5a, 12a is a vent hole provided on the outer periphery of the bracket A3a, B2a, 1
3a is a base. The base 13a is a bracket A3a
It is fastened by welding and supports the main body of the electric motor.

Regarding the electric motor configured as described above,
By welding the base 13a and the bracket A13a, a simple structure of the electric motor can be provided, which greatly contributes to the quick delivery of the electric motor.

[0012]

INDUSTRIAL APPLICABILITY As described above, the present invention can provide a simple structure of an electric motor, and greatly contributes to quick delivery without causing manufacturing confusion.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a conventional electric motor

[Explanation of symbols]

 1,1a Shaft 2,2a Bracket B 3,3a Bracket A 4,4a Through bolt 5,5a Rotor 6,6a Stator 7,7a Anti-load side ball bearing 8,8a Load side ball bearing 9 Frame 10,10a Coil 11, 11a Casting fan 12,12a Air hole 13,13a Base

Claims (3)

[Claims] 1. A stator having a stator core whose outer periphery is exposed to the outside, a rotor and a bar formed by aluminum die casting to form a casting fan on the end ring, and an outer diameter of the stator. It has two brackets that hold it from both the load side and the anti-load side with respect to the outer diameter of the ball bearings that form the rotor, and in the bracket, wind holes are provided in the circumferential direction and the radial direction from the end face center, and at the same time, The wind hole has a cut-and-raised portion formed on the outer circumferential side by bending toward the electric motor side, and the load-side bracket and the base are fastened together by welding to support the main body including the stator, rotor, and bracket. Open type induction motor. 2. The open-type induction motor according to claim 1, wherein the anti-load side bracket and the base are fastened together by welding, and the main body including the stator, the rotor and the bracket is supported. 3. The open type induction motor according to claim 1, wherein the bracket and the base are fastened by caulking and screwing.