JP2004248413A - Squirrel-cage rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a squirrel-cage rotor which preserves its strength at manufacture, and will not mar its external appearance, and can prevent the infiltration of foreign matters into its inside. <P>SOLUTION: This squirrel-cage rotor is equipped with a stacked core 2 which has a center hole 3 to engage with a rotating shaft at its center and is fixed around the rotating shaft and is constituted by stacking a plurality of magnetic thin plates, a plurality of through-holes 5, which are made through axially adjacent to the periphery of the stacked core 2, a plurality of conductor bars 6 which are arranged in the through-holes 5, and conductor sections which are constituted of a pair of short-circuited rings 7 short-circuiting those conductor bars 6 at both ends in axial direction of the stacked core 2 and coupling them with each other and moreover are coupled with each other by a welding process. The short circuit ring 7 is provided with a ventilation hole at the end face on stacked core 2 side of the axial short-circuiting circular through-hole 8 made for inserting the conductor bar 6. The ventilation hole is constituted of a short-circuit circular cut 14, a short-circuit circular through-hole 15 in the direction of the inside diameter or a short-circuit circular through-hole in the direction of the outside diameter. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a gas flow path structure that allows gas generated during welding to escape in a cage rotor in which a conductor portion is formed by welding.
[0002]
[Prior art]
Conventionally, there is a cage rotor in which a conductor portion is formed by welding (for example, Patent Document 1). FIG. 4 shows a gas vent structure of the conductor portion of such a cage rotor. FIG. 5 shows the final shape of the cage rotor in which the conductor is formed by welding.
In FIG. 4, 1 is a rotor, 2 is a laminated core formed by laminating a plurality of magnetic thin plates, and 3 is formed to penetrate between both end surfaces of the laminated core 2 in the laminating direction, and is for inserting and fixing a rotating shaft (not shown). A plurality of axial core through-holes formed in the outer peripheral surface of the laminated core 2 forming the outer periphery of the laminated core 2 and formed in the axial direction at equal intervals in the circumferential direction in the vicinity of the outer peripheral surface 4 of the laminated core. , 6 are a plurality of conductor rods arranged in each of the axial core through-holes 5, 7 are a pair of conductor rods arranged at both axial ends of the laminated core 2 for mechanically and electrically connecting the plurality of conductor rods 6 to each other. A short-circuit ring, 8 is a plurality of axial short-circuit ring through holes formed in the axial direction to insert the conductor bar 6 into the short-circuit ring 7, 9 is a short-circuit ring outer peripheral surface forming an outer periphery of the short-circuit ring, and 10 is a laminated core. 2 through the core through hole 5 in the axial direction toward the outer peripheral surface 4 of the laminated core. -Out laminated core notches as a gas flow path for the formed venting, 11 denotes a filler material to be heaped up during welding.
In FIG. 5, reference numeral 12 denotes an outer peripheral surface after machining after the outer periphery of the rotor 1 is finished to a predetermined size by machining after laminating the laminated core 2.
[0003]
[Patent Document 1]
JP-A-7-288959
[Problems to be solved by the invention]
However, such a conventional technique has the following problems.
(1) At least one surface of the laminated core 2 adjacent to the laminated core notch 10 serving as a gas flow path is not restricted in the core laminating direction at the laminated core notch. For this reason, after laminating a predetermined number of laminated cores 2, when performing machining for finishing the outer peripheral surface 4 of the laminated core to the outer peripheral surface 12 after machining, the laminated core 2 adjacent to the laminated core notch 10 is plastically deformed due to processing resistance. Cause deformation. In FIG. 5, reference numeral 13 denotes a deformed core in which the laminated core 2 undergoes plastic deformation due to processing resistance.
Therefore, due to plastic deformation of the laminated core 2 caused by the laminated core notch 10, the strength is reduced and the appearance is impaired.
(2) In addition, the cutting powder may enter the inside of the rotor from the cutouts 10 of the laminated core, thereby deteriorating the rotational balance and damaging the electric motor.
The present invention has been made in order to solve such a problem, and provides a cage rotor capable of maintaining strength during manufacture, not impairing the appearance, and preventing entry of foreign matter into the inside. It is intended to do so.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a laminated core having a central hole fitted to a rotating shaft at a central portion, fixed to an outer peripheral surface of the rotating shaft, and laminated with a plurality of magnetic thin plates, A plurality of through holes formed in the axial direction in proximity to the outer peripheral surface of the laminated core, a plurality of conductor rods arranged in the through holes and a short circuit between the conductor rods at both axial ends of the laminated core, and A cage-shaped rotor comprising a pair of interconnected short-circuiting rings and having a conductor portion connected by a welding process, wherein an axial short-circuiting ring penetratingly formed for inserting a conductor rod into said short-circuiting ring. A gas vent is provided at the end face of the hole on the laminated core side.
In the present invention, the gas passage structure of the cage rotor in which the conductor portion is formed by welding has a gas vent formed in a short-circuit ring having higher rigidity than the laminated core to form a gas passage, and The path is configured so as not to be in contact with the processed part of the laminated core to be machined after the core is laminated.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. The basic configuration of the cage rotor according to the present invention is the same as that of the prior art, and thus the description thereof will be omitted, and only the differences between the components of the present invention and the prior art will be described.
[First Embodiment]
FIG. 1 is a sectional view showing a gas flow path structure of a cage rotor formed by welding according to a first embodiment of the present invention.
The present invention differs from the prior art in that the short-circuit ring has a gas vent at the end face of the axial short-circuit ring through hole 8 formed on the laminated core 2 side for inserting a conductor rod.
The gas vent hole is specifically constituted by a short-circuit ring notch 14 formed from the end face of the axial short-circuit ring through hole 8 on the side of the laminated core 2 toward the center hole 3.
In this embodiment, the gas flow path structure of the cage rotor in which the conductor portion is formed by welding is such that the short-circuit ring 7 having higher rigidity than the laminated core 2 is provided with a gas vent, for example, a short-circuit ring notch 14. A gas flow path is formed, and the gas flow path is configured so as not to be in contact with a processing portion of the laminated core 2 to be machined after lamination of the core.
As a result, since the gas flow path does not contact the surface of the laminated core 2 to be machined, even if the outer peripheral surface 4 of the laminated core is machined after lamination of the core, the surface of the laminated core to be machined remains axial in the entire range of lamination. Direction, and deformation due to machining can be prevented.
[Second embodiment]
FIG. 2 is a sectional view showing a gas flow path structure of a cage rotor formed by welding according to a second embodiment of the present invention.
In the present embodiment, the gas vent hole is formed of an inner diameter direction short-circuit ring through hole 15 formed from the end face of the axial short circuit ring through hole 8 on the side of the laminated core 2 toward the center hole 3.
The operation and effect of the second embodiment are the same as those of the first embodiment.
[Third embodiment]
FIG. 3 is a cross-sectional view illustrating a gas flow path structure of a cage rotor formed by welding according to a third embodiment of the present invention.
In this embodiment, the gas vent hole is formed by the outer radial direction short-circuit ring through hole 16 formed from the end face of the axial short-circuit ring through hole 8 toward the short-circuit ring outer peripheral surface 9 from the end face on the laminated core 2 side.
The operation and effect of the third embodiment are the same as those of the first embodiment.
[0007]
【The invention's effect】
As described above, according to the present invention, since the gas flow path does not contact the surface of the laminated core to be machined, even if the outer periphery of the core is machined after lamination of the core, the surface of the laminated core to be machined is laminated. Is restrained in the axial direction in the entire range, and has an effect of preventing deformation due to machining.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part showing a cage rotor according to a first embodiment of the present invention.
FIG. 2 is a sectional view of a main part showing a cage rotor according to a second embodiment of the present invention.
FIG. 3 is a sectional view of a main part showing a cage rotor according to a third embodiment of the present invention.
FIG. 4 is a cross-sectional view of a main part showing a venting structure of a conductor portion of a cage rotor in which a conductor portion is formed by conventional welding, and shows a state before machining the outer peripheral surface of a laminated core. .
5 is a cross-sectional view of a main part showing a state after machining the outer peripheral surface of the laminated core of the cage rotor of FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor 2 Laminated core 3 Center hole 4 Laminated core outer peripheral surface 5 Axial core through hole 6 Conductor rod 7 Shorting ring 8 Axial short circuit ring through hole 9 Shorting ring outer peripheral surface 10 Laminated core notch 11 Filler material 12 Machining Rear outer peripheral surface 13 Deformed core 14 Short circuit ring notch 15 Inner diameter direction short circuit ring through hole 16 Outer diameter direction short circuit ring through hole

Claims (4)

A central core having a central hole to be fitted to the rotating shaft at the center, and a fixed core fitted and fixed to the outer peripheral surface of the rotating shaft, and a laminated core formed by laminating a plurality of magnetic thin plates, close to the outer peripheral surface of the laminated core. A plurality of through-holes formed in the axial direction, a plurality of conductor rods arranged in the through-hole, and a pair of short-circuit rings for short-circuiting the conductor rods at both axial ends of the laminated core and interconnecting the conductor rods; A cage-shaped rotor having a conductor portion which is formed and connected by a welding process,
The squirrel-cage rotor according to claim 1, wherein the short-circuit ring has a gas vent at an end face of the laminated short-circuit ring through hole formed for inserting the conductor rod. 2. The cage rotor according to claim 1, wherein the gas vent is formed by a short-circuit ring notch formed from the end face of the axial short-circuit ring through hole toward the center hole from the laminated core side end face. 3. 2. The cage-shaped rotation according to claim 1, wherein the gas vent comprises a radial short-circuit ring through-hole formed from the end face of the laminated core side of the axial short-circuit ring through-hole toward the center hole. 3. Child. The car according to claim 1, wherein the gas vent comprises a radial short-circuit ring through-hole formed from a range between both end surfaces of the axial short-circuit ring through-hole toward the outer peripheral side of the short-circuit ring. Shaped rotor.

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