JPH07123661A - Assembled cage rotor - Google Patents

Abstract

PURPOSE:To provide an assembled cage rotator having conductor end rings which facilitates the improvement of the performance of an induction motor. CONSTITUTION:A conductor bar 12 inserted into a plurality of respective slots provided in a rotor core 11 is composed of one continuous conductor. Or, a conductor bar inserted into at least two slots is composed of one continuous conductor. Further, trenches to bury conductor bars are provided in the end planes of conductor end rings to make the conductor bars inserted into a plurality of slots be one continuous conductor. Therefore, an electric resistance can be reduced in comparison with the electric resistance in the case that individual conductor bars are connected separatly, so that the performance of an induction motor can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squirrel cage rotor of an induction motor.

[0002]

2. Description of the Related Art Conventionally, a squirrel-cage rotor of an induction motor has a method of forming a conductor portion thereof by casting molten metal into a rotor iron core by die casting and a method of forming a plurality of slots provided in the rotor iron core. Generally, there are two methods, that is, a method of assembling and configuring a conductor bar inserted and mounted in each, and a conductor end ring provided at both ends of a rotor iron core. Particularly, in recent years, in order to solve quality problems such as generation of a nest of a conductor portion and cutting of a bar in a slot, which are defects of the die casting method, a manufacturing method using an assembly method is becoming mainstream.

A conventional assembly type squirrel cage rotor will be described below. FIG. 4 shows a rotor core of a conventional assembly type cage rotor. In FIG. 4, 1 is a rotor iron plate and 2 is a slot. A rotor iron plate 1 formed by punching a thin iron plate into a disc shape has a plurality of slots 2 for passing a conductor bar on its outer peripheral portion. A plurality of rotor iron plates 1 are laminated so that the slots 2 penetrate therethrough to form a rotor core.

FIG. 5 shows the structure of a conventional assembly type squirrel cage rotor. Reference numeral 3 is a rotor core, and 4 is one of a plurality of penetrating slots provided in the rotor core 3.
5 is a conductor bar, 6 is a conductor end ring, 7 is a hole for passing the conductor bar 5 provided in the conductor end ring 6,
It is configured to penetrate each of the plurality of slots 4. A conductor bar 5 is inserted and mounted in each of a plurality of through-holes 4 provided in the rotor core 3 and holes 7 provided in the conductor end ring 6 so as to penetrate therethrough. The conductor end ring 6 is caulked and mechanically and electrically connected by welding, ultrasonic bonding, or the like.

Since the conductor bar 5 and the conductor end ring 6 are electrically connected to each other, a rotor current flows, and the conductor bar 5 and the conductor end ring 6 function as a cage rotor of an induction motor.

[0006]

However, in general, those connected by caulking, welding, ultrasonic bonding, etc. tend to have a larger electric resistance than an integrated body, so that in the above-mentioned conventional structure, a plurality of conductors are used. Since each bar is electrically connected to the conductor end ring separately, there are many connection points, the electrical resistance of the connection points increases, and it is difficult for the rotor current to flow.As a result, the performance of the induction motor deteriorates. Had a point.

Further, in the above-mentioned conventional structure, since the contact area of the connecting portion between the conductor bar and the conductor end ring is small, the electric resistance at the connecting portion becomes large and the rotor current hardly flows,
As a result, there is a problem that the performance of the induction motor is deteriorated.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an assembly type cage rotor which improves the performance of an induction motor.

[0009]

In order to achieve this object, in the squirrel cage rotor of the present invention, the conductor bar inserted into each of the plurality of slots is made into a single continuous conductor. have.

Further, the conductor bar inserted into and mounted in at least two or more slots is made into a continuous single conductor.

Further, there is provided a structure in which a groove for embedding the conductor bar is provided in the end surface of the conductor end ring.

[0012]

With this structure, since the conductor bars inserted and mounted in the plurality of slots form one continuous conductor, the electric resistance can be reduced as compared with the case where the conductor bars are separately connected. As a result, The performance of the induction motor can be improved.

Further, since the conductor bars inserted and mounted in at least two or more slots form one continuous conductor, the electric resistance can be reduced as compared with the case where the conductor bars are separately connected. As a result, the performance of the induction motor can be improved.

Further, since the contact area between the conductor end ring and the conductor bar can be increased by providing the groove for embedding the conductor bar on the end surface of the conductor end ring, it is possible to electrically connect the conductor end ring and the conductor bar separately. The resistance can be reduced, and as a result, the performance of the induction motor can be improved.

[0015]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 11 is a rotor core, 12 is a conductor bar, and 13 is a conductor end ring. FIG. 2 is a diagram showing the details of the conductor end ring, and 14 is a groove for embedding the conductor bar provided on the end face of the conductor end ring.

The conductor bar 12 is composed of one continuous conductor, and its tip and end are electrically connected by caulking, welding, ultrasonic bonding, or the like. Further, the conductor bar 12 is embedded in the groove 14 provided in the conductor end ring 13, and the conductor bar 12 and the conductor end ring 1 are
3 is also electrically connected by caulking the contact portion and welding, ultrasonic bonding, or the like.

The operation of the assembling type squirrel-cage rotor constructed as described above will be described. The conductor bar that is inserted and installed in multiple slots is composed of one continuous conductor, so the number of connection points can be reduced compared to the case where each conductor is connected separately, so the electrical resistance due to the connection is reduced. The size of the induction motor can be reduced, and as a result, the performance of the induction motor can be improved.

Further, since the contact area between the conductor end ring and the conductor bar can be increased by providing the groove for embedding the conductor bar on the end surface of the conductor end ring, it is possible to increase the electrical conductivity as compared with the case where the conductor end rings and the conductor bar are individually connected. The resistance can be reduced, and as a result, the performance of the induction motor can be improved.

(Embodiment 2) A second embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, 31 is a rotor core, 32 is a conductor bar, 33 is a conductor end ring, 34 is a groove for embedding the conductor bar provided on the end face of the conductor end ring,
Reference numeral 35 is a connecting portion of the conductor bar.

The operation of the assembling type squirrel cage rotor configured as described above will be described. Since the conductor bar inserted and mounted in at least two or more slots is composed of one continuous conductor, it is possible to reduce the number of connecting points as compared with the case where they are connected one by one, so that the connection is made by the connection. The electric resistance can be reduced, and as a result, the performance of the induction motor can be improved.

[0023]

As described above, according to the present invention, the conductor bar inserted and mounted in each of the plurality of slots is constituted by one continuous conductor, and the conductor bar is inserted and mounted in at least two or more slots. By constructing the conductor bar with one continuous conductor and by providing a groove for embedding the conductor bar on the end surface of the conductor end ring, it is possible to realize an assembly type squirrel cage rotor that improves the performance of the induction motor. Is.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a squirrel cage rotor according to a first embodiment.

FIG. 2 is a detailed view of a conductor end ring according to the present invention.

FIG. 3 is a configuration diagram of an assembly type squirrel cage rotor according to a second embodiment.

FIG. 4 is a block diagram of a rotor core of a conventional assembly type cage rotor.

FIG. 5 is a block diagram of a conventional assembly type cage rotor.

[Explanation of symbols]

 1 rotor iron plate 2,4 slot 3 rotor iron core 5,12,32 conductor bar 6,13,33 conductor end ring 11,31 rotor iron core 14,34 groove for embedding conductor bar 35 conductor bar connecting portion

Claims (3)

[Claims] 1. A rotor core, a conductor bar inserted into and mounted in each of a plurality of slots provided in the rotor core, and conductor end rings provided at both ends of the rotor core are assembled. In the squirrel-cage rotor, an assembly-type squirrel-cage rotor characterized in that the conductor bar is composed of one continuous conductor. 2. The assembly type squirrel-cage rotor according to claim 1, wherein at least the conductor bar inserted into and mounted in at least two slots is constituted by one continuous conductor. 3. The assembly type squirrel-cage rotor according to claim 1, wherein a groove for embedding the conductor bar is provided in an end surface of the conductor end ring.