JPH0715927A - Manufacture of motor rotor - Google Patents

Abstract

PURPOSE:To increase the space factor of a rod-form conductor while reducing respectively the clearances between the rod-form conductor and respective core-side and end-plate-side slots, by inserting the rod-form conductor respectively into the core-side and end-plate-side slots, and by expanding the rod-form conductor in the slots through a pressure plastic forming, and thereafter, by joining the rod-form conductor respectively to the end plates. CONSTITUTION:A rod-form conductor 5 is inserted respectively into a core-side slot 2S formed in a core 2 and into end-plate-side slots 3S, 4S formed respectively in end plates 3, 4. Thereafter, the rod-form conductor 5 is subjected to a pressure deformation processing by an extrusion bar 25, and it is expanded respectively in the respective slots 2S, 3S, 4S. Thereby, the clearances between the rod-form conductor 5 and the respective slots 2S, 3S, 4S are eliminated respectively. Thereafter, both the end sides of the rod-form conductor 5 are joined respectively to the interfaces of the end plates 3, 4, and the motor rotor wherein the rod-form conductor 5 is joined in a body to the end plates 3, 4 is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a motor rotor used for manufacturing a motor rotor of a squirrel cage motor, for example.

[0002]

2. Description of the Related Art A squirrel-cage induction motor, which is one of three-phase induction motors, includes a large number of rod-shaped conductors which are housed in slots formed in a core by a secondary winding provided in a motor rotor and cores. An induction motor consisting of an end plate (or end ring, etc.) that short-circuits these rod-shaped conductors on both sides. It is a normal cage type with conductors stored in slots of ordinary depth, or high resistance using high resistance conductors. There are special squirrel cage motors such as squirrel cage and double squirrel cage induction motors with a special structure for the secondary winding and deep groove squirrel cage induction motors ("Mechanical Engineering Handbook", May 15, 1988, new edition) 2nd edition Published by Japan Society of Mechanical Engineers A8-49 to A8-5
Page 0 3.3.2 Types and characteristics of three-phase induction machine).

FIG. 1 shows an example of the structure of a motor rotor used for this type of squirrel-cage electric motor. The motor rotor 1 is made of copper or copper on the upper and lower sides of a core 2 made of laminated iron core in the figure. The end plates 3 and 4 made of copper alloy are provided, and the rod-shaped conductors 5 made of copper or copper alloy are provided in the many core-side slots formed in the core 2 and the many plate-side slots formed in the end plates 3 and 4, respectively. Is inserted, and the rod-shaped conductor 5 and the end plates 3 and 4 are electrically joined to each other.

17 and 18 show a conventional internal structure of a motor rotor 1 having the external structure shown in FIG. 1. FIG. 17 is a vertical cross section taken along line AA of FIG. FIG. 18 is an explanatory view of a plane, and FIG. 18 is an explanatory view of a horizontal cross section taken along the line BB in FIG.

As shown in FIGS. 17 and 18, the rod-shaped conductor 5 includes a core-side slot 2S formed on the core 2 and plate-side slots 3S and 4 formed on the end plates 3 and 4, respectively.
The rod-shaped conductor 5 and the end are formed by inserting a gap 6 into the S and the rod-shaped conductor 5, and forming joints 7 and 8 by brazing in the gap 6 between the end portions of the rod-shaped conductor 5 and the plate-side slots 3S and 4S, respectively. It has a structure in which the plates 3 and 4 are electrically joined.

When manufacturing the motor rotor 1 having such a structure, as shown in the process of FIG. 13, a rod-shaped conductor 5 made of a copper rod is prepared by cutting and is prepared.
The end plates 3 and 4 made of copper plates are prepared by cutting, and further, the core 2 made of an iron core is punched out from thin electromagnetic steel plates and laminated (coupling by caulking, press fitting by pipes after lamination, etc.), Prepared by annealing for strain relief, and place the end plates 3 on both sides of the core 2.
4 are superposed and assembled, the rod-shaped conductor 5 is inserted into the core-side slot 2S and the plate-side slots 3S and 4S, and both end portions of the rod-shaped conductor 5 and the plate-side slot 3 are inserted.
The rod-shaped conductor 5 and the end plates 3 and 4 are electrically connected to each other by forming the joints 7 and 8 by brazing and joining in the gaps between S and 4S (about 0.05 to 0.3 mm on both sides). I was trying to join them.

[0007]

However, in such a conventional motor rotor, the rod-shaped conductor 5 and the rod-shaped conductor 5 are arranged so that the rod-shaped conductor 5 can be smoothly inserted into the slots 2S, 3S, 4S. A gap 6 is formed between each slot 2S, 3S, 4S, and the brazing material is formed by brazing the gap 6 between the both ends of the rod-shaped conductor 5 and the plate-side slots 3S, 4S. Joint 7 by
8 is formed, the linear area ratio of the rod-shaped conductor 5 (the cross-sectional area of the rod-shaped conductor 5 / the cross-sectional area of the core-side slot 2S) decreases due to the formation of such a gap 6, and brazing causes There is a problem that the joints 7 and 8 may reduce the conductivity and generate heat.

Further, since the clearance 6 is not sufficiently secured and the joining work by brazing is required, the assembling, inserting and brazing work shown in FIG. There is a problem that a lot of time is spent, and it has been an issue to solve these problems.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is possible to easily insert a rod-shaped conductor into the core-side slot and the plate-side slot. It is possible to improve the wire area ratio of the rod-shaped conductor (cross-sectional area of the rod-shaped conductor / cross-sectional area of the core side slot), and improve the electrical conductivity between the rod-shaped conductor and the end plate to improve the conductivity in this portion. It is an object of the present invention to manufacture a motor rotor that can suppress heat generation and can further improve motor performance.

[0010]

According to a method of manufacturing a motor rotor according to the present invention, end plates are provided on both sides of a core, and rod-shaped conductors are provided in a core side slot formed in the core and a plate side slot formed in the end plate. When manufacturing a motor rotor in which the rod-shaped conductor and the end plate are joined by inserting the rod-shaped conductor into the slot on the core side and the slot on the plate side, the rod-shaped conductor is pressure-plasticized to form the rod-shaped conductor. Is swelled in each slot to reduce the gap between the rod-shaped conductor and each slot, and then the rod-shaped conductor and the end plate are joined together. When joining the conductor and the end plate, laser welding, electron beam welding, etc. In addition, in the same embodiment, a heating step by electric furnace heating, high frequency heating, etc. is provided as a pre-step of pressure plastic working of the rod-shaped conductor, and in the same embodiment, heating of the rod-shaped conductor is performed. It is characterized in that the process and the pressure plastic working are integrated to further simplify the process.

[0011]

In the motor rotor manufacturing method according to the present invention, the core-side slot and the plate-side slot are set to such a size that insertion of the rod-shaped conductor is acceptable even when using an automatic machine or the like. The insertion of the rod-shaped conductor into each slot can be performed more easily even when using an automatic machine or the like, and after the rod-shaped conductor is inserted, the rod-shaped conductor is subjected to pressure plastic working to expand in the processing slot.
By reducing or eliminating the gap between the rod-shaped conductor and each slot, the wire area ratio of the rod-shaped conductor is further increased, and a large gap is not formed between the rod-shaped conductor and the end plate side slot. Since it is not necessary to fill the gap and the conductivity between the rod-shaped conductor and the end plate is further improved, heat generation in this portion is reduced, and the motor performance is further improved.

[0012]

EXAMPLE 1 In this example, as shown in FIG. 1, a core 2 made of a laminated iron core is provided with end plates 3 and 4 made of copper or copper alloy on both upper and lower sides in the drawing, and the core is 2. A large number of core side slots and end plates 3 and 4 formed in 2
In the case of manufacturing the motor rotor 1 having a structure in which a large number of rod-shaped conductors 5 made of copper or copper alloy are inserted into the large number of plate-side slots formed in the above, and the rod-shaped conductors 5 and the end plates 3 and 4 are joined Is shown as an example.

2 to 8 show a first embodiment of the present invention, in which FIG. 2 shows an assembling process of the core 2 and the end plates 3, 4. Here, FIG. The assembling jig 11 to be used has a carrying plate 12 and a positioning jig 13.

The positioning jig 13 has a center positioning guide 13a and an angle positioning guide key 13b, and is positioned with respect to the transport plate 12 by the shaft hole 13c and the knock pin 14.

Further, FIG. 3 shows a step of inserting the rod-shaped conductor 5, and a guide gate 16 for inserting the rod-shaped conductor 5 is used.

Further, FIG. 4 shows a pressure plastic working step for the rod-shaped conductor 5, and the press plastic working jig 21 used here is a pressure head 22, a guide member 23, and The pressing head 22 has a connecting shaft 24, and the pressing head 22 has a large number of pushing rods 25. The connecting shaft 24 is fixed to the pressing head 22 by a nut 26. Also,
5 and 6 show a state after the rod-shaped conductor 5 is pressure-plastic-worked by the processing jig 21.

Further, FIGS. 7 and 8 show a fusion bonding process for electrically bonding both end sides of the rod-shaped conductor 5 and the end plates 3 and 4, and the welding processing head 31 has at least two. These are moved by NC numerical control, and rod-shaped conductor 5 and each plate-side slot 3 are provided.
It is assumed that the entire circumference of the interface with S and 4S or appropriate points are joined.

Next, the procedure for manufacturing the motor rotor 1 by the steps shown in FIGS. 2 to 8 will be described including the step diagram shown in FIG.

As shown in FIG. 14, a rod-shaped conductor 5 made of a copper rod is prepared by cutting and prepared, and end plates 3 and 4 made of copper plates are prepared by cutting, and further, an iron core is formed. The core 2 is manufactured by punching thin electromagnetic steel plates, laminating (bonding laminating by caulking, press-fitting bonding by pipes after laminating, etc.), annealing for strain relief, and preparing an automatic machine such as a robot hand not shown. make use of,
The positioning jig 13 of the assembly jig 11 shown in FIG. 2 includes a lower end plate 4, a core 2, and an upper end plate 3.
Set automatically in the order of. At this time, the core 2 and the upper and lower end plates 3 and 4 are positioned by the positioning jig 13
Since the guide shaft 13a is provided to coaxially position the guide shaft 13a and the guide key 13b is used to perform angular positioning, no positional deviation occurs.

Next, in the step of inserting the rod-shaped conductor 5 shown in FIG. 3, the rod-shaped conductor 5 is supplied to the gate 16 by an automatic machine such as a transfer device (not shown), and the rod-shaped conductor 5 becomes the gate 1.
6 through slot 3S, slot 2S, slot 4S
Are inserted in sequence. At this time, the rod-shaped conductor 5 and the slot 3
A gap 6 is formed between S, 2S and 4S,
The rod-shaped conductor 5 has the above-mentioned gap 6 after the pressure plastic working in the next step.
Is made longer by a dimension H commensurate with the volume required to fill the space.

Next, in the pressure plastic working step shown in FIG. 4, the guide member 23 and the pressure head 22 are integrally lowered until the lower end portion of the guide member 23 abuts on the upper end portion of the end plate 3, and the guide member 23 is lowered. After the lower end portion of 23 hits the upper end portion of the end plate 3, only the pressure head 22 descends, and the rod-shaped conductor 5 is pressed by the pushing rod 25 to be plastically deformed.

Table 1 shows an example of the conditions adopted in the pressure plastic working.

[0023]

[Table 1]

By such pressure plastic working, the rod-shaped conductor 5 swells in each slot 3S, 2S, 4S, and as shown in FIGS. 5 and 6, the rod-shaped conductor 5 is inserted in each slot 3S, 4S.
As a result of being brought into close contact with the wall surfaces of 2S and 4S, the gap (6) generated before the pressure plastic working is eliminated.

Next, in the fusion bonding process shown in FIG.
A high energy density heat source 32 such as a laser beam or an electron beam is irradiated from a welding processing head 31 onto the entire circumference of an interface portion between the rod-shaped conductor 5 and the end plate 3 or at an appropriate place to form a fusion-bonded portion 33.

Then, the assembly is temporarily removed from the central positioning guide shaft 13a by an unillustrated automatic machine such as a robot hand, inverted, and then inserted again into the central positioning guide shaft 13a, as shown in FIG. The high-energy-density heat source 32 is irradiated from the welding processing head 31 on the entire circumference of the interface between the rod-shaped conductor 5 and the end plate 4 or at an appropriate position to form the fusion-bonded portion 34, whereby the rod-shaped conductor 5 is formed. And the conductivity between the rod-shaped conductor 5 and the end plates 3 and 4 is made good.

Therefore, the core-side slots 2S and the plate-side slots 3S, 4S are made large enough to allow the rod-shaped conductor 5 to be inserted into the slots 3S, 2S, 4S by an automatic machine or the like. Since the rod-shaped conductor 5 can be more easily inserted by an automatic machine or the like, the rod-shaped conductor 5 can be automatically inserted, and after the rod-shaped conductor 5 is inserted, the rod-shaped conductor 5 is subjected to pressure plastic working to form each rod. By expanding in the slots 2S, 3S, 4S, the clearance between the rod-shaped conductor 5 and each of the slots 2S, 3S, 4S is eliminated, so that the linear area ratio of the rod-shaped conductor 5 is further increased. 5 and the end plate side slots 3S and 4S, a large gap is not formed, so there is no need to fill the gap with a brazing material and the rod-shaped conductor 5 and the end plate. Heat generated in this portion by the conductivity between the bets 3,4 is further improved becomes small, it becomes possible to further improve the motor performance.

Embodiment 2 FIG. 9 shows a second embodiment of the present invention. By comparing FIG. 14 showing the process of the first embodiment with FIG. 15 showing the process of the second embodiment. As is apparent, after the step of inserting the rod-shaped conductor 5 and before the pressure plastic working step, heating (annealing) is performed.
The case where steps are included is shown.

In the heating (annealing) step, an electric furnace 41 having a heater 42 as shown in FIG. 9 is used. Inside the electric furnace 41, the core 2, the end plates 3 and 4, and the rod-like shape are formed. The assembly jig 11 with the conductor 5 set therein is installed, and heating (annealing) is performed.

In this case, the heating temperature is preferably about 730 to 770 ° C. which is the annealing temperature of the core (iron core) 2, and one example of the press plastic working conditions in this case is shown in Table 2.
Shown in.

[0031]

[Table 2]

According to the second embodiment, the core 2 made of the iron core can be annealed and the rod-shaped conductor 5 is also heated. Therefore, when the rod-shaped conductor 5 is subjected to pressure plastic working. It is possible to make the required pressing force to be considerably smaller than that in the first embodiment.

Third Embodiment FIG. 10 shows a third embodiment of the present invention, which is the second embodiment.
Instead of the embodiment, heating (annealing) may be performed before the pressure plastic working according to the process shown in FIG. 15 by the high-frequency heating device having the induction heating coil 43.

Also in the third embodiment, the core 2 made of the iron core can be annealed and the pressing force required for the pressure plastic working on the rod-shaped conductor 5 can be made considerably small. Is possible.

Embodiment 4 FIG. 11 shows a fourth embodiment of the present invention. FIG. 15 shows the steps of the second and third embodiments, and FIG. 16 shows the steps of the fourth embodiment. As is clear from the comparison,
It shows a case where the heating (annealing) step and the pressure plastic working step in the three examples are performed in one step to further simplify the steps.

That is, as shown in FIG.
An assembly jig 11 in which the core 2, the end plates 3 and 4, and the rod-shaped conductor 5 are set in an electric furnace 41 including 2
And a processing jig 21 for pressure plastic working having a structure similar to that shown in FIG. 4 is installed, and the pushing rod 2 is placed in the electric furnace 41 from above the rod-shaped conductor 5 in a heated state.
It shows a case where the rod-shaped conductor 5 is expanded in each of the slots 2S, 3S, 4S by lowering 5 and heating (annealing) and pressurization are performed in one step.

In the fourth embodiment, since the heating step and the pressure plastic working step are completed in one step,
It is possible to further simplify the process.

Fifth Embodiment FIG. 12 shows a fifth embodiment of the present invention. As shown in FIGS. 5 and 6, a rod-shaped conductor 5 is extruded from a rod 2.
5, the assembly is removed from the assembly jig 11, and the central positioning guide shaft 53a and the angular positioning guide key 53b are provided on the tip portion of the rod 53 as shown in FIG. Using the welding assembly holder 51, a high energy density heat source 32 such as a laser beam or an electron beam is welded to the welding head at the interface between the end portions 3 and 4 on both ends of the rod-shaped conductor 5. Simultaneous irradiation from 31 to weld joints 33, 34
In this case, according to the fifth embodiment, it is possible to further improve the efficiency of welding and joining.

[0039]

In the method of manufacturing the motor rotor according to the present invention, the end plates are provided on both sides of the core, and
Insert a rod-shaped conductor into the core-side slot formed in the core and the plate-side slot formed in the end plate to join the rod-shaped conductor and the end plate to manufacture a motor rotor. After inserting the rod-shaped conductor, the rod-shaped conductor is pressure-plasticized to expand the rod-shaped conductor in each slot, and then the rod-shaped conductor and the end plate are joined together. Since the size of the slot and the rod-shaped conductor insertion slot formed on the end plate side may be larger than before, it is possible to insert the rod-shaped conductor into the core-side slot and the plate-side slot by an automatic machine. By making it large enough to insert it, it can be inserted into each slot more easily even with an automatic machine. After inserting the rod-shaped conductor into the core-side slot and the end-plate-side slot, the rod-shaped conductor is pressure-plasticized and expanded in the slot, thereby reducing the gap between the rod-shaped conductor and each slot. Or, by eliminating, the wire area ratio of the rod-shaped conductor (cross-sectional area of the rod-shaped conductor / cross-sectional area of the core side slot)
Can be made even larger, and since a large gap is not formed between the rod-shaped conductor and the slot on the end plate side, there is no need to fill the gap with a brazing filler metal and the gap between the rod-shaped conductor and the end plate can be eliminated. It is possible to further improve the electric conductivity of the motor, and by improving the electric conductivity, the heat generation in this part can be further reduced, and it is possible to further improve the performance of the motor rotor and The automation of the manufacturing of the child is further facilitated, and the remarkably excellent effect that the productivity of the motor rotor can be improved is brought about.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a structure of a motor rotor.

FIG. 2 is an explanatory longitudinal sectional view showing an assembling process of the core and the end plate in the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional explanatory view showing the step of inserting the rod-shaped conductor in the first embodiment of the present invention.

FIG. 4 is a vertical cross-sectional explanatory view showing a pressure plastic working process for the rod-shaped conductor in the first embodiment of the present invention.

FIG. 5 is an explanatory longitudinal sectional view showing a state after the pressure plastic working step is performed on the rod-shaped conductor in the first embodiment of the present invention.

6 is a partial horizontal cross-sectional explanatory view taken along the line CC of FIG.

FIG. 7 is a vertical cross-sectional explanatory view showing the first half of the fusion bonding process in the first embodiment of the present invention.

FIG. 8 is a vertical cross-sectional explanatory view showing the latter half of the fusion bonding process in the first example of the present invention.

FIG. 9 is an explanatory longitudinal sectional view showing a second embodiment of the present invention.

FIG. 10 is an explanatory longitudinal sectional view showing a third embodiment of the present invention.

FIG. 11 is an explanatory longitudinal sectional view showing a fourth embodiment of the present invention.

FIG. 12 is a vertical cross sectional view showing a fifth embodiment of the present invention.

FIG. 13 is a block diagram showing a conventional manufacturing process of a motor rotor.

FIG. 14 is a block diagram showing a manufacturing process of the motor rotor according to the first embodiment of the present invention.

FIG. 15 is a block diagram showing a manufacturing process of a motor rotor according to second and third embodiments of the present invention.

FIG. 16 is a block diagram showing a manufacturing process of a motor rotor according to a fourth embodiment of the present invention.

17 is a vertical cross-sectional explanatory view showing a conventional internal structure of the motor rotor shown in FIG. 1 at a position corresponding to the line AA in FIG. 1.

FIG. 18 is an explanatory view of a partial horizontal section taken along the line BB in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 motor rotor 2 core 2S core side slot 3 end plate 3S end plate side slot 4 end plate 4S end plate side slot 5 rod-shaped conductor 6 gap 11 assembly jig 21 pressing plastic working jig 31 welding welding head 33 Melt joint part 34 Melt joint part 41 Electric furnace 43 Induction heating coil 51 Welding assembly holder

Claims (4)

[Claims] 1. An end plate is provided on both sides of a core, and a rod-shaped conductor is inserted into a core side slot formed in the core and a plate side slot formed in the end plate,
When manufacturing a motor rotor in which a rod-shaped conductor and an end plate are joined, the rod-shaped conductor is inserted into the core-side slot and the plate-side slot, and then the rod-shaped conductor is press-plasticized to form the rod-shaped conductor in each slot. A method for manufacturing a motor rotor, which comprises swelling with a rod and then joining the rod-shaped conductor and the end plate. 2. The method of manufacturing a motor rotor according to claim 1, wherein when the rod-shaped conductor and the end plate are joined, they are fused and joined by high energy density welding such as laser beam and electron beam. 3. The method for manufacturing a motor rotor according to claim 1, wherein a heating step by electric furnace heating, high frequency heating or the like is provided as a pre-step of pressure-plasticizing the rod-shaped conductor. 4. The method of manufacturing a motor rotor according to claim 1, wherein heating and pressure plastic working of the rod-shaped conductor are integrated.