JPH09322460A - Open-type flanged induction motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost and weight of an open-type flanged induction motor. SOLUTION: A flange 13a made of steel plate is fixed to a bracket 2 on the counter-load side by through-bolts 4a with a load side bracket 3a and a stator 6a therebetween. Bowl-shaped drawn parts to which the load side bracket 3a is attached and a flat parts with which a motor is attached to an other machine are formed in the steel plate flange 13a and attaching holes are formed in the drawn parts and the flat part. With this constitution, the cost and weight of the motor can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange type open induction motor, and more particularly to a structure of a flange for mounting an electric motor.

[0002]

2. Description of the Related Art FIG. 3 is a cross-sectional view of a conventional open type induction motor (hereinafter referred to as an electric motor). In FIG. 3, 1 is a shaft of the motor, and 7 is an anti-load side ball press-fitted to the anti-load side of the shaft 1. bearing,
8 is a load side ball bearing press-fitted into the load side of the shaft 1, 2 is a steel plate anti-load side bracket which holds the anti-load side ball bearing 7 and has an air hole on the end face, 3 holds the load side ball bearing 8 A casting flange having air holes on its outer circumference, 4 through bolts for fixing the casting flange 3 and the anti-load side bracket 2, 5 a rotor fixed to the shaft 1, and 6 a stator provided at a position facing the rotor 5. , 9 are frames for fixing the stator 6, 10
Is a coil that generates a magnetic field in the gap between the stator 6 and the rotor 5 by passing an electric current, 11 is a casting fan formed in the aluminum die casting of the rotor 5, and 12 is a vent hole formed on the circumference of the frame 9. , 13 is frame 9
It is a base fixed by welding to.

The electric motor is constructed so that an electromagnetic force is generated by an electric current induced in the rotor 5 by a magnetic field excited in the gap to give a rotating force to the shaft 1 and transmit the power to a load.

[0004]

In this flange type open type induction motor, cost reduction, size reduction and weight reduction are required.

It is an object of the present invention to provide an open type induction motor with a flange, which has a mounting strength equal to or higher than that of a cast flange type, and is low in cost and light in weight.

[0006]

In order to solve this problem, the present invention sandwiches a stator between a steel plate anti-load side bracket and a steel plate load side bracket in which a steel plate flange is welded together, and uses a bolt to insert the stator. It is configured to be fastened to the anti-load side bracket, and mounting holes are respectively provided in a bowl-shaped throttle bottom portion having a welding projection for mounting the load side bracket on a steel plate flange and a flat portion for mounting to another device.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, a load side bracket made of a steel plate and an anti-load side bracket made of a steel plate to be mounted on the outer periphery of a stator from both sides, and a bowl-shaped throttle bottom portion fastened to the load side bracket by welding. A flat part to be attached to another device and a steel plate flange each having a mounting hole are provided, and the stator is sandwiched between the anti-load side bracket and the load side bracket formed by welding the steel plate flange, and the flange is fastened with a bolt. It is an open type induction motor, and it has the same mounting strength as a cast flange and can be made low cost and lightweight.

[0008]

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

FIG. 1 is a sectional view of an embodiment of the present invention.
1a is the shaft of the electric motor, 7a is the anti-load side ball bearing press-fitted to the anti-load side of the shaft 1a, 8a is the load side ball bearing press-fitted to the load side of the shaft 1a, and 2a is the anti-load side ball bearing 7a. Steel-made anti-load side bracket having air holes on its end face, 3a is a steel-made load side bracket having load side ball bearings 8a and having air holes on its end face, 4a is a load side bracket 3a and an anti-load side Through bolts for fixing the bracket 2a to the outer circumference of the stator and fixing it, 5a is a rotor fixed to the shaft 1a, 6a is a stator provided at a position facing the rotor 5a, and 10a is a stator 6a and a rotor 5a, in which a current flows. Coils that generate a magnetic field in the gap between,
Reference numeral 11a is a casting fan formed on the aluminum die casting of the rotor 5a, 12a is a wind hole provided on the outer periphery of the load side bracket 3a and the anti-load side bracket 2a, 13a is a steel plate flange, and a steel plate flange 13a is a load side bracket 3a. Is fastened to the welded portion 14a by the through bolt 4a.
Is fastened to the anti-load side bracket 2a from the steel plate flange 13a through the load side bracket 3a and the stator 6a to support the motor body.

FIG. 2 is a half cross-sectional view of a steel plate flange according to an embodiment of the present invention. The steel plate flange 13a has a bottom portion 15a in which the throttle portion for mounting the through bolt is deeper than the head of the through bolt and is squeezed into a bowl shape. Mounting holes are respectively provided in the protrusion 16a for welding with the load side bracket and the flat portion 17a for mounting to other equipment.

[0011]

As described above, according to the present invention, since the flange is made of cast steel and made of steel plate, the cost and weight can be reduced, and the mounting portion of the through bolt of the steel plate flange can be squeezed into a bowl shape. Therefore, it is possible to increase the rigidity of the flange and secure the mounting strength of the flange, and the steel plate flange and the load side bracket made of steel plate are welded together to further strengthen the motor body support by the steel plate flange. Is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an open type induction motor with a flange according to an embodiment of the present invention.

FIG. 2 is a half sectional view of a steel plate flange according to an embodiment of the present invention.

FIG. 3 is a sectional view of a conventional motor.

[Explanation of symbols]

 1,1a Shaft 2,2a Anti-load side bracket 3 Casting flange 3a Load side bracket 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 Wind hole 13a Steel plate flange 14a Welded portion 15a Bottom portion 16a Projection portion 17a Flat portion

Claims (1)

[Claims] 1. A load side bracket made of a steel plate and an anti-load side bracket made of a steel plate to be mounted on both sides of the outer periphery of a stator, and a flat bottom to be attached to the load side bracket and a bowl-shaped throttle bottom portion and other equipment by welding. An open type induction motor with a flange, in which a stator is sandwiched between the anti-load side bracket and the load side bracket formed by welding the steel sheet flange, and the stator is fastened with a through bolt.