JP2005261005A - Process and apparatus for manufacturing squirrel cage rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide apparatus and process for manufacturing a squirrel cage rotor at a low cost, while enhancing work efficiency by enabling application of brazing to the other side with a short cooling time, without taking out the squirrel cage rotor from an enclosed container, after completing brazing on one side. <P>SOLUTION: The manufacturing apparatus 1 of a squirrel cage rotor 3, where a rotor bar 20 fitted in a laminated core 21 and an end ring 22 are connected through brazing comprises a brazing material 20 arranged in a recess formed at the end part of the end ring 22, a raising/lowering device 4 fixed to the underside of a container 6 and moving the squirrel cage rotor 3 in the axial direction under a substantially vertical state, a device 8 for gripping the laminated core 21, while making it inverted by 180° about an axis perpendicular to the axial direction of the core 21, a heating coil 7 arranged in the container 6 in close proximity to the hoisting/lowering passage of the squirrel cage rotor 3, and a high-frequency power supply 16 for supplying a high-frequency current to a heating coil 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method and an apparatus for manufacturing a squirrel-cage rotor that manufactures a rotor used in a squirrel-cage induction motor by brazing.

Conventionally, in the manufacture of a rotor used for a cage induction motor, a rotor bar and an end ring made of a conductive material made of copper or a copper alloy have been joined by hand brazing. However, since temperature control is difficult in this method, the strength of the brazed portion varies, and therefore, a cage-type rotor manufacturing apparatus using high-frequency heating with easy temperature control has been proposed as the first conventional technique. (For example, refer to Patent Document 1).
FIG. 6 is an external perspective view of the first conventional technique when the motor rotor is joined by brazing. In FIG. 6, when high frequency heating is performed by heating the rotor bar 31, the end ring 32, and the brazing material 33 by the high frequency heating coil 34, the temperature of the brazing part and the liquid phase temperature material of the brazing material are calculated using the infrared sensor 35. The temperature is detected and temperature control is performed, and the rotor bar 31 and the end ring 32 are brazed.
In addition, as a second prior art, an example of a motor stator, an apparatus including a sealed container for making a heating atmosphere an inert gas atmosphere and a high-frequency heating coil for high-frequency heating outside the sealed container Has been proposed (see, for example, Patent Document 2).
FIG. 7 is a block diagram showing a motor stator manufacturing apparatus according to the second prior art, and FIG. 8 is a front sectional view of the motor stator of FIG. 7 and 8, the shaft 42 is fitted into a plurality of axial core grooves 41 a formed on the outer peripheral surface, and the laminated core 41 is set in a substantially horizontal state in a non-conductive substantially sealed container 44. After supplying the inert gas into the container 44, a high-frequency current is supplied to the high-frequency heating coil 45 disposed close to the container 44 to inductively heat the laminated iron core 41, and the laminated iron core 41 is axially moved in the container 44. While being moved, the brazing material 43 is supplied from the supply hole 44a disposed in the container 44, the shaft 42 is brazed to the iron core groove 41a, and then the laminated iron core 41 is rotated by a predetermined angle, so that all the shafts 42 are moved. Braze sequentially. Thereby, the shaft 42 and the iron core groove 41a and the like are firmly brazed and fixed using induction heating, and the product cost can be reduced and the work efficiency can be improved.
Japanese Patent No. 3180691 (3rd page, Fig. 2) Japanese Unexamined Patent Publication No. 7-135753 (page 3, FIG. 1)

However, in the prior art, a cage rotor is placed in a vacuum or atmosphere gas in a sealed container, and a copper or copper alloy bar inserted into a groove of the laminated core constituting the rotor and both sides of the laminated core. When brazing the end ring made of copper or copper alloy using high-frequency heating, the laminated iron core is moved or rotated in the axial direction in the hermetic container, causing the following problems.
(1) After the brazing on one side is completed, the time until the brazing on the other side where the brazing is not completed (so-called cooling waiting time for preventing oxidation) becomes longer.
(2) The work efficiency deteriorates because it is necessary to take out the cage rotor from the sealed container and set it again.
(3) It is necessary to introduce a large amount of an inert gas for cooling into the hermetic container, which increases the cost.
The present invention has been made to solve the above problems, and after the brazing on one side is completed, the brazing on the other side can be performed with a short cooling waiting time without removing the cage rotor from the sealed container. An object of the present invention is to provide a manufacturing method and a manufacturing apparatus of a low-cost cage rotor by improving work efficiency and the like.

In order to solve the above problem, the present invention is configured as follows.
According to the first aspect of the present invention, the rotor bar fitted into the plurality of axial grooves formed on the outer peripheral surface of the laminated iron core and the end rings provided at both ends of the rotor bar in the axial direction are placed in vacuum or in an atmospheric gas. In the method of manufacturing a cage rotor connected by attaching, a brazing material for brazing the rotor bar is disposed in a recess formed at an end of the end ring, and the cage rotor is placed in a substantially sealed container. In a heating coil that is set in a substantially vertical state, the cage rotor set in the substantially vertical state is moved up and down in the axial direction by a lifting device, and is arranged close to the lifting path of the cage rotor in the container. A high frequency current is supplied by a current supply device and the rotor bar and the end ring are induction heated, and the rotor bar and end ring at one end of the laminated iron core are induction heated. After completion, the laminated iron core in the container is grasped by a reversing device, and one end and the other end of the iron core are turned upside down, and the axis perpendicular to the axial direction of the iron core is 180. It is characterized by inversion and brazing by induction heating sequentially.
The invention according to claim 2 is that the rotor bar fitted into the plurality of axial grooves formed on the outer peripheral surface of the laminated core and the end rings provided at both axial ends of the rotor bar are in vacuum or in atmospheric gas. In the apparatus for manufacturing a cage rotor connected by brazing, a brazing material for brazing the rotor bar disposed in a recess formed at an end of the end ring and the cage rotor are substantially sealed. A lifting device that moves up and down in an axial direction in a substantially vertical state in the container, and a laminated iron core in the container in the axial direction of the iron core so that one end and the other end of the iron core are opposite to each other A grip reversing device for reversing 180 ° around an axis perpendicular to the axis, a heating coil disposed in the container in the vicinity of the lifting path of the cage rotor, and a current for supplying a high-frequency current to the heating coil Is characterized by comprising a charging device, a.
According to a third aspect of the present invention, there is provided the cage rotor manufacturing apparatus according to the second aspect, wherein the grip reversing device includes a gripping jig that grips a side surface of the laminated iron core in a lateral direction, and a gripping jig of the gripping jig. It is characterized in that it is provided with a drive unit that is provided at the other end and performs linear reciprocation and rotation.
According to a fourth aspect of the present invention, in the squirrel-cage rotor manufacturing apparatus according to the third aspect, the tip of the gripping jig has a substantially V-shaped cross section.

According to the first and second aspects of the present invention, when brazing the bar and both end rings by high-frequency heating in a sealed container under vacuum or atmospheric gas, without taking out the cage rotor from the sealed container, Also, there is no problem of oxidation, and it is possible to complete high-quality brazing in a shorter time, improving the working efficiency and suppressing the cost increase, and a manufacturing method and a manufacturing apparatus for a high-quality cage rotor Can be provided.
According to the invention described in claim 3, the grip reversing device is provided with a gripping jig for gripping the side surface of the laminated iron core from the left and right direction, and provided at the other end of the gripping jig for performing a linear reciprocation operation and a rotation operation. Since the drive unit is provided, when brazing the end ring and the rotor bar, it can be reliably and easily reversed about the axis perpendicular to the axial direction of the laminated core.
According to the invention described in claim 4, since the tip shape of the gripping jig has a substantially V-shaped cross section, it is possible to securely and safely grip the laminated core with the gripping jig.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a basic configuration diagram of a cage rotor manufacturing apparatus showing an embodiment of the present invention.
In FIG. 1, 1 is a manufacturing apparatus, 2 is a positioning jig, 3 is a squirrel-cage rotor, 4 is a lifting device, 5 is a valve, 6 is a container, 7 is a heating coil, 8 is a grip reversing device, and 8a is a drive unit. , 9 is a valve, 10 is a holding jig, 11 is a valve, 12 is a vacuum pump, 13 is a valve, 14 is a gas supply device, 15 is a valve, 16 is a high-frequency power source, and 17 is a thermometer. Reference numeral 18 denotes an air supply device, 19 denotes a control device, 20 denotes a rotor bar, 21 denotes a laminated iron core, and 22 denotes an end ring.
FIG. 2 is a cross-sectional view of a squirrel-cage rotor to be brazed.
In FIG. 2, 22a and 22b are end rings, 23 is a brazing material, 24 is an iron jig, 25a and 25b are brazing portions, and 26a and 26b are concave portions.
The features of the present invention are as follows.
That is, in FIG. 1 and FIG. 2, the rotor bar 20 fitted in the plurality of axial grooves 21a formed on the outer peripheral surface of the laminated core 21 and the end rings 22 (22a, 22a, 22b provided at both axial ends of the rotor bar 20). 22b) in the cage-type rotor manufacturing apparatus 1 connected by brazing in vacuum or atmospheric gas, the rotor bar 20 disposed in the recesses 26a, 26b formed at the ends of the end rings 22a, 22b is brazed. A brazing material 23 for attaching, and a lifting device 4 that is attached to the lower side of the container 6 and moves the squirrel-cage rotor 3 up and down in an axial direction in a substantially sealed container 6, The laminated iron core 21 in the container 6 is rotated 180 around an axis in a direction perpendicular to the axial direction of the iron core 21 so that one end and the other end of the iron core 21 are opposite to each other. A grip reversing device 8 for reversing, a heating coil 7 disposed in the container 6 in the vicinity of the lifting path of the cage rotor 3, and a current supply device (high frequency power supply 16) for supplying a high frequency current to the heating coil 7 are provided. It is a point.
The grip reversing device 8 includes a gripping jig 10 that grips the outer peripheral side surface of the laminated iron core 21 from the left and right directions, and a drive unit 8a that is provided at the other end of the gripping jig 10 and performs linear reciprocation and rotation. It has become.
The drive unit 8a of the elevating device 4 and the grip reversing device 8 uses a pneumatic device such as an air cylinder (not shown), and can be easily supplied by supplying air using the air supply device 18 as a drive source. Although driven, a motor may be used instead of the pneumatic device used for the lifting device 4 and the grip reversing device 8 (both not shown).

Then, as another configuration, the positioning jig 2 is attached to the upper part of the lifting device 4, and the squirrel-cage rotor 3 is set on a predetermined portion of the positioning jig 2 and is fixed securely.
Further, the container 6 is configured by welding stainless steel or the like so as to be able to withstand the atmospheric pressure during decompression, so that the sealed state can be maintained. A heating coil 7 in which a connecting portion with the high frequency power source 16 is taken out of the container 6 is attached to the container 6 so as not to deteriorate the sealing property in the upper part of the container 6.
Further, the container 6 is provided with a quartz glass window 6a for enabling the temperature measurement of the brazed part from the outside of the container 6 by the thermometer 17, and a valve 11 for decompressing the inside of the container 6; A valve 13 for supplying an inert gas into the container 6 and a valve 15 for releasing the inert gas charged into the container 6 to the outside of the container 6 are provided.
Further, based on temperature data measured by the thermometer 17, etc., control valves 5 and 9, gas valves 11 and 13, a control device 19 that controls the high-frequency power supply 16, and the like are provided.

Next, the operation will be described with reference to FIGS. 1 and 2 and FIGS. 3 and 4 described later.
3 is a side view showing a state where the cage rotor has moved to the position of the heating coil in the manufacturing apparatus of FIG. 1, and FIG. 4 shows a state where the cage rotor is gripped by the grip reversing device in the manufacturing apparatus of FIG. It is explanatory drawing, (a) is a side view, (b) is the figure which looked at the attachment state of a cage-shaped rotor and a holding jig from the upper side, FIG. 5 is a cage-shaped rotation by the grip reversing device in the manufacturing apparatus of FIG. It is a side view which shows the state after reversing the child 180 degrees. Here, the tip shape of the gripping jig 10 has a substantially V-shaped cross section as shown in FIG. 4B, and the gripping jig 10 can grip the laminated iron core 21 reliably and safely. It can be implemented.
First, in FIG. 1, when the lifting device 4 is at the lower end in the container 6, the rotor bar 20 and the end ring 22 are arranged on the laminated core 21 with respect to the positioning jig 2 provided on the upper portion of the lifting device 4. The squirrel cage rotor 3 is set in a substantially vertical state. The cage rotor 3 has an iron jig 24 inserted in the center of a hollow cylindrical laminated iron core 21 shown in FIG. 2 and the lower side of the iron jig 24 is assembled to the positioning jig 2. Next, as shown in FIG. 3, the cage-shaped rotor 3 set in a substantially vertical state is moved up and down in the axial direction by the lifting device 4 in a state where the inside of the container 6 is sealed, and is attached above the inside of the container 6. The squirrel-cage rotor 3 is positioned at a predetermined position of the heating coil 7 thus obtained.
In this state, the vacuum pump 12 and the gas supply device 14 are operated, and the valve 11 is opened by the control signal of the control device 19 to decompress the inside of the container 6. When the inside of the container 6 reaches a predetermined pressure, an inert gas such as argon gas or nitrogen gas is supplied into the container 6 until the valve 11 is closed and the valve 13 is opened and the pressure in the container 6 reaches about atmospheric pressure. Then, the valve 13 is closed. The valve 11 is opened, the inside of the container 6 is decompressed again, and the high-frequency power source 16 is activated in a state where the pressure in the container 6 reaches a predetermined pressure, and is placed close to the lifting path of the cage rotor 3 in the container. A high frequency current is supplied to the heating coil 7. When a high frequency current is supplied to the heating coil 7, the rotor bar 20 and the end ring 22b are induction heated. In this case, when brazing is performed in an atmospheric gas, an inert gas such as argon gas or nitrogen gas is supplied, and after the valve 13 is closed, the pressure inside the container 6 is not reduced again.
Then, the brazing part is heated while sequentially feeding back the temperature measurement result by the thermometer 17 according to the heating pattern set in the control device 19 in advance. When the brazing is completed, the high frequency power supply 16 is stopped by the control signal of the control device 19, heating is stopped, and the valve 11 is closed. During heating, the valve 11 can be opened and closed so that the pressure in the container 6 becomes a predetermined pressure. Thereafter, the valve 13 is opened by a control signal from the control device 19, and an inert gas such as argon gas or nitrogen gas is supplied into the container 6, and then released from the container 6 through the valve 15. The temperature of the attached portion is measured, the cage rotor 3 is cooled until a predetermined temperature is reached, and the valve 13 is closed.
After the induction heating of the rotor bar 20 and the end ring 22b at one end of the laminated core 21, the gripping jig 10 provided at the tip of the reversing device 8 is gripped by the center of the laminated core 21 as shown in FIG. The elevating device 4 is lowered so as to be the same height as the horizontal position. Next, after the lifting / lowering device 4 stops at the target position, the reversing device 8 holds the cage rotor 3 in the container 6, and the end rings 22 a and 22 b provided at one end and the other end of the laminated core 21 are moved. Inverted by 180 ° about the axis perpendicular to the axial direction of the iron core so as to be opposite to each other, as shown in FIG. It stops with the end ring part 22a facing up, and the lifting device 4 is raised. The squirrel-cage rotor 3 stops in a state where it is set on the positioning jig 2, the grip reversing device 8 is opened, the lifting device 4 is lifted again, and the heating coil 7 mounted above the container 6 is placed at a predetermined position. The cage rotor 3 is positioned. In this state, the valve 11 is opened by the control signal of the control device 19, the inside of the container 6 is depressurized, the valve 11 is closed in a state where the inside of the container 6 reaches a predetermined pressure, the high frequency power supply 16 is activated, A high frequency current is supplied. In this case, when brazing is performed in the atmospheric gas, the valve 11 remains closed and the pressure is not reduced. And according to the heating pattern set in the control device 19 in advance, the temperature measurement result by the thermometer 17 is sequentially fed back, the brazing part is heated, the brazing is completed, and the control signal of the control device 19 is used. The high frequency power supply 16 is stopped, heating is stopped, and the valve 11 is closed. During heating, the valve 11 can be opened and closed so that the pressure in the container 6 becomes a predetermined pressure. Thereafter, the valve 13 is opened by a control signal from the control device 19, and an inert gas such as argon gas or nitrogen gas is supplied into the container 6, and the inside of the container 6 is largely discharged while being discharged from the container 6 through the valve 15. The pressure is returned to the atmospheric pressure, and the valve 13 is closed. And the raising / lowering apparatus 4 descend | falls to a descending end, and all brazing is completed.

  Therefore, in this embodiment, the cage rotor can be turned 180 ° and positioned in a sealed container in a vacuum or atmospheric gas as described above, so that the cage rotor can be removed from the container. The induction heating can be used to easily braze the rotor bar and the end ring portions on both sides in a short time, and there are very few brazing defects, and a high-quality cage rotor can be obtained.

  The brazing object can be moved up and down, reversed, etc. in a container held in vacuum or atmospheric gas, so the brazing object is brazed in vacuum or atmospheric gas. Can be applied to cases where there are a plurality of similar brazing portions and it is difficult to braze a plurality of places at once.

Basic configuration diagram of a manufacturing apparatus showing an embodiment of the present invention Cross-sectional configuration diagram of squirrel-cage rotor for brazing joint The side view which shows the state which the cage rotor moved to the position of the heating coil in the manufacturing apparatus of FIG. It is explanatory drawing which shows the state which hold | gripped the cage rotor by the grip inversion apparatus in the manufacturing apparatus of FIG. 1, Comprising: (a) is a side view, (b) is the attachment state of a cage rotor and a holding jig from upper direction. Viewed The side view which shows the state after reversing a cage rotor 180 degrees by the grip reversing apparatus in the manufacturing apparatus of FIG. External perspective view in the case of performing brazing joining of the rotor showing the first prior art The block diagram which showed the manufacturing apparatus of the motor stator in 2nd prior art Front sectional view of the motor stator of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Positioning jig 3 Cage-shaped rotor 4 Lifting apparatus 5 Valve 6 Container 7 Heating coil 8 Grasp and reversing apparatus 9 Valve 10 Holding jig 11 Valve 12 Vacuum pump 13 Valve 14 Gas supply device 15 Valve 16 High frequency power supply 17 Thermometer 18 Air supply device 19 Control device 20 Rotor bar 21 Laminated iron cores 22, 22a, 22b End ring 23 Brazing material 24 Iron jigs 25a, 25b Brazing part

Claims (4)

A squirrel-cage rotation in which a rotor bar fitted in a plurality of axial grooves formed on the outer peripheral surface of a laminated iron core and end rings provided at both axial ends of the rotor bar are connected by brazing in vacuum or in an atmospheric gas In the child manufacturing method,
Placing a brazing material for brazing the rotor bar in a recess formed in an end of the end ring;
The cage rotor is set in a substantially vertical state in a substantially sealed container,
The cage-shaped rotor set in the substantially vertical state is moved up and down in the axial direction by a lifting device,
A high-frequency current is supplied by a current supply device to a heating coil arranged close to the lifting path of the cage rotor in the container, and the rotor bar and the end ring are induction-heated,
After the induction heating of the rotor bar and end ring at one end of the laminated core is completed, the laminated iron core in the container is gripped by the reversing device so that one end and the other end of the iron core are turned upside down. A method for manufacturing a squirrel-cage rotor, characterized in that it is inverted 180 ° around an axis perpendicular to the axial direction of the iron core and brazed by sequential induction heating. A cage shape in which a rotor bar fitted in a plurality of axial grooves formed on the outer peripheral surface of a laminated iron core and end rings provided at both axial ends of the rotor bar are connected by brazing in a vacuum or in an atmospheric gas. In the rotor manufacturing equipment,
A brazing material for brazing the rotor bar disposed in a recess formed at an end of the end ring;
An elevating device that moves the cage rotor in a substantially vertical state in a substantially sealed container and moves it up and down in the axial direction;
A grip reversing device for reversing the laminated iron core in the container by 180 ° about an axis perpendicular to the axial direction of the iron core so that one end and the other end of the iron core are vertically opposite to each other; ,
A heating coil disposed in the container close to the lifting path of the cage rotor;
A current supply device for supplying a high-frequency current to the heating coil;
A squirrel-cage rotor manufacturing apparatus characterized by comprising:   The grip reversing device includes a gripping jig that grips a side surface of the laminated iron core from the left and right directions, and a drive unit that is provided at the other end of the gripping jig and performs a linear reciprocating operation and a rotating operation. 3. The apparatus for manufacturing a cage rotor according to claim 2, wherein   The squirrel-cage rotor manufacturing apparatus according to claim 3, wherein a tip shape of the gripping jig has a substantially V-shaped cross section.

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