JP4977591B2 - Manufacturing method of rotor - Google Patents

Description

The present invention relates to a method of manufacturing a rotor for improving the tension of a binding material layer in a coil end portion of a rotor coil.

  A rotor of a conventional AC excitation type variable speed generator motor is formed in a rotor core made of a laminate of thin steel plates and a slot provided on the outer periphery of the rotor core and comes out of the slot in the axial direction. The rotor coil includes a coil end portion, a backup ring that supports the coil end portion of the rotor coil, and a binding material layer for fixing the coil end portion of the rotor coil to the backup ring. The bind material layer is wound around the bind material layer while the bind material layer is fed with a high tension while the rotor is rotated with a rotating device to keep the bind material layer with a high tension. In the rotor, the coil end portion of the rotor coil where the rotor coil end is overhanging from the rotor core retains the centrifugal force acting by the rotation of the rotating machine. A backup ring is provided, and the rotor coil end is fixed to the backup ring by applying a tension from the outer peripheral side of the rotor coil end and winding the bind material layer.

  At the time of winding the binding material layer, the rotor is installed on the rotating device, and the binding material layer is wound while maintaining the high tension from the feeding device of the binding material layer while rotating the rotor. At this time, since the periphery of the rotor coil is heated in order to cure the binding material layer, the rotor coil and the backup ring rise in temperature and thermally expand. On the other hand, when the rotor coil and the backup ring return to room temperature, the shrinkage rate of the backup ring is larger than the shrinkage rate of the binding material layer. The tension of the belt is lower than that during bind winding. Therefore, it is necessary to maintain a tension higher than the necessary tension when the band is wound in anticipation of this decrease. For this reason, it is necessary to enlarge the feeding device and the rotating device itself that rotates the rotor.

  In order to solve this problem, after fixing the rotor coil to the backup ring with the binding material layer, a binding member made of a nonmagnetic metal or nonmetallic material is added to the end of the binding material layer, and the end of the assembly is assembled. Deformation of the binding material layer is prevented (for example, see Patent Document 1).

JP 2006-141103 A

Since the conventional method for manufacturing a rotor is configured as described above, a new member called a restraining member is required, which increases the number of manufacturing steps and is complicated, and it is necessary to manage the member and is easy to manufacture. There was a problem of disappearing.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a rotor in order to easily maintain the tension of the binding material layer of the coil end portion of the rotor coil. To do.

The present invention relates to a rotor core having a slot formed along the axial direction, a rotor coil having a coil end portion that is housed in the slot and goes out of the slot in the axial direction, and a coil end of the rotor coil In a method for manufacturing a rotor comprising a backup ring disposed on the inner peripheral side of the part and a binding material layer wound around the outer periphery of the coil end part of the rotor coil,
In the process of winding the binding material layer around the coil end of the rotor coil,
The backup ring is wound while the binding material layer is heated while being cooled.

The method of manufacturing a rotor according to the present invention includes a rotor core having a slot formed along the axial direction, a rotor coil having a coil end portion that is housed in the slot and that extends outward from the slot in the axial direction, In a method for manufacturing a rotor comprising a backup ring disposed on the inner peripheral side of the coil end portion of the rotor coil and a binding material layer wound around the outer periphery of the coil end portion of the rotor coil,
In the process of winding the binding material layer around the coil end of the rotor coil,
Since the winding is performed while the backup ring is cooled and the binding material layer is heated , the tension of the binding material layer can be easily and satisfactorily maintained.

Embodiment 1 FIG.
Embodiments of the present invention will be described below. 1 is a diagram for explaining a method of manufacturing a rotor according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged cross-sectional view showing a configuration of a coil end portion of a rotor coil of the rotor shown in FIG. (Corresponding to the X portion in FIG. 1). In the figure, the rotor is formed by being housed in a rotor core 1 made of a laminate of thin steel plates and having slots formed on the outer periphery along the axis B direction in which the rotor rotates, and in the slots of the rotor core 1. And a rotor coil 2 having a coil end portion A that protrudes outward in the axial direction from both ends of the rotor core 1. The rotor coil 2 is composed of a lower coil 2a on the inner peripheral side of the shaft B and an upper coil 2b on the outer peripheral side. And the connector 2c for connecting the lower opening coil 2a and the upper opening coil 2b is arrange | positioned at the edge part of the lower opening coil 2a and the upper opening coil 2b.

  Further, in order to support the coil end portion A of the rotor coil 2, the backup ring 3 disposed on the inner peripheral side of the coil end portion A of the rotor coil 2 and the coil end portion A of the rotor coil 2 are backed up. In order to fix to the ring 3, a bind material layer 4 wound around the outer periphery of the coil end portion A of the rotor coil 2 is provided. The backup ring 3 is disposed in order to ensure the strength of the coil end portion A of the rotor coil 2, and the strength is required. Therefore, it is conceivable that the backup ring 3 is formed of a metal material. The binding material layer 4 may be formed of a material whose thermal expansion coefficient is smaller than that of the backup ring 3. Specifically, since the backup ring 3 is formed of a metal material, it is conceivable that the backup ring 3 is formed of a resin material or glass fiber having a smaller thermal expansion coefficient. Further, the binding material layer 4 is composed of a lower opening binding material layer 4a for fixing the lower opening coil 2a and an upper opening binding material layer 4b for fixing the upper opening coil 2b. And in order to manufacture the rotor comprised in this way, the feeding device 5 which winds applying the tension | tensile_strength to the binding material layer 4, The rotating device 6 for rotating a rotor in order to wind the binding material layer 4, In order to air-cool the backup ring 3, a cooling device 7 constituted by a fan or the like is used.

  Next, a method for manufacturing the rotor according to the first embodiment configured as described above will be described. First, the backup ring 3 is disposed at a desired position. Then, the lower coil 2a of the rotor coil 2 is inserted into the slot of the rotor core 1, and the coil end portion A of the lower coil 2a extending from the slot to the outside in the axial direction is formed. Next, the lower opening binding material layer 4a is wound around the outer periphery of the coil end portion A of the lower opening coil 2a. Further, the upper opening coil 2b is inserted into the slot of the rotor core 1 in which the lower opening coil 2a is inserted, and the coil end portion A of the upper opening coil 2b extending outward in the axial direction from the slot is formed. . Next, the connector 2c is disposed on the upper and lower ends of the lower end coil 2a and the upper end coil 2b of the coil end portion A, and the lower end coil 2a and the upper end coil 2b are connected. Next, the upper opening binding material layer 4b is wound around the outer periphery of the coil end portion A of the upper opening coil 2b.

  In the step of winding each of the binding material layers 4a and 4b, the binding material layer 4 is fed from the feeding device 5 while being heated and wound around the coil end portion A. As another method, a method of heating the bind material layer 4 after being wound around the coil end portion A, a method of heating the bind material layer 4 while feeding it from the feeding device 5 and winding it, and further heating after winding And so on. This heating is appropriately set according to the material forming the binding material layer 4, and an example of heating to about 80 ° C. is an example. Of course, the binding material layer 4 can be wound without being heated. However, in general, if the binding material layer is to be brought into a desired state (cured state) while maintaining the tension in the wound state, it is not practical because it takes much time unless heating is performed. For this reason, normally, the backup ring 3 is also heated and the temperature of the backup ring 3 rises.

  Therefore, in order not to raise the temperature of the backup ring 3, the backup ring 3 is cooled by blowing cool air with the cooling device 7. At this time, the backup ring 3 is in a contracted state (not in an expanded state). In this state, when the binding material layer 4 is tensioned and wound around the outer peripheral portion of the coil end portion A of the lower coil 2a or the upper coil 2b of the rotor, the coil end portion A becomes the tension of the binding material layer 4. The inward displacement is generated by the amount of matching, and the coil end portion A of the rotor coil 2 is fixed to the backup ring 3. Further, when the backup ring 3 is returned to room temperature, the tension of the binding material layer 4 is increased by the backup ring 3 expanding in the outer peripheral direction.

  According to the method for manufacturing the rotor of Embodiment 1 performed as described above, since the backup ring is cooled in the step of winding the binding material layer, the expansion of the backup ring can be suppressed, and further, the room temperature state The tension of the binding material layer can be increased by expanding when returned to. For this reason, the tension | tensile_strength of the bind material layer required at the time of winding of a bind material layer can be reduced, and size reduction of the delivery apparatus of a bind material layer, a rotation apparatus, etc. can be achieved. In addition, there is no need to prepare other new members, and the manufacturing is simple without increasing the number of manufacturing steps. In particular, in the AC excitation type variable speed generator-motor that employs the rotor having such a configuration, the rotation speed of the rotor is high, so it is important to fix the coil end portion of the rotor. It was necessary to wind with high tension. For this reason, the effect of miniaturizing the binding material layer feeding device and the rotating device itself is great.

Embodiment 2. FIG.
FIG. 3 is an enlarged cross-sectional view (corresponding to a portion X in FIG. 1) showing the configuration of the coil end portion of the rotor according to the second embodiment of the present invention. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In addition, since the delivery device, the rotation device, and the like shown in the first embodiment are the same as those shown in FIG. 1, they will be described here with reference to FIG. A cooling device 8 that can be disposed on the inner peripheral side of the backup ring 3 to cool the backup ring 3 and a thermometer 9 for measuring the temperature of the backup ring 3 are provided. Examples of the cooling device 8 include a cooler having a cold heat source such as cold water, ice, and dry ice, or a cooler having a cold water chiller composed of a refrigerant, a compressor, a heat exchanger, and the like. .

  Next, a method for manufacturing the rotor according to Embodiment 2 of the present invention will be described. First, the binding material layer 4 is wound around the coil end portion A of the rotor coil 2 through the same process as in the first embodiment. In the step of winding the binding material layer 4, the cooling load of the cooling device 8 is controlled so that the temperature of the backup ring 3 becomes a desired temperature while measuring the temperature with a thermometer 9 attached to the backup ring 3. To adjust. Then, the temperature of the backup ring 3 is maintained at a constant desired cooling temperature.

  According to the manufacturing method of the rotor of the second embodiment performed as described above, the effect of the same effect as in the first embodiment is obtained, and the temperature of the backup ring at the time of winding the binding material layer is The amount of shrinkage of the backup ring when the binding material layer is wound and the amount of expansion of the backup ring after the binding material layer is wound can be easily estimated from the material characteristics of the backup ring. Therefore, the amount of increase in the tension of the binding material layer when the backup ring is returned to room temperature is determined by the shrinkage amount and expansion amount of the backup ring, so by taking into account the shrinkage amount and expansion amount of the backup ring in advance, The tension required for the binding material layer can be easily set within a specified value.

Embodiment 3 FIG.
4 is an enlarged cross-sectional view (corresponding to a portion X in FIG. 1) showing the configuration of the coil end portion of the rotor according to the third embodiment of the present invention. In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof is omitted. In addition, since the delivery device, the rotation device, and the like shown in the first embodiment are the same as those shown in FIG. 1, they will be described here with reference to FIG. In order to cool the rotor core 1, a cooling device 10 disposed on the outer peripheral side of the rotor core 1 is provided.

  Next, a method for manufacturing a rotor according to Embodiment 3 of the present invention will be described. First, the binding material layer 4 is wound around the coil end portion A of the rotor coil 2 through the same steps as in the above embodiments. In the step of winding the binding material layer 4, the rotor core 1 is cooled by the cooling device 10 in addition to the cooling of the backup ring 3.

  According to the method of manufacturing the rotor of the third embodiment performed as described above, the backup ring is disposed on the rotor core as well as the same effects as those of the respective embodiments described above. Therefore, the temperature of the rotor core also rises, and it is considered that the temperature of the backup ring rises as the temperature rises. However, in the third embodiment, by cooling the rotor core, the backup ring is more reliably contracted, and the tension of the binding material layer when the binding material layer is wound can be further reduced. Miniaturization can be achieved.

Embodiment 4 FIG.
FIG. 5 is an enlarged cross-sectional view (corresponding to the portion X in FIG. 1) showing the configuration of the coil end portion of the rotor according to the fourth embodiment of the present invention. In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof is omitted. In addition, since the delivery device, the rotation device, and the like shown in the first embodiment are the same as those shown in FIG. 1, they will be described here with reference to FIG. A heat insulating material portion 11 made of, for example, glass wool or heat resistant cement is provided between the backup ring 3 and the inner periphery of the coil end portion A of the rotor coil 2.

  Next, a method for manufacturing a rotor according to Embodiment 4 of the present invention will be described. First, the binding material layer 4 is wound around the coil end portion A of the rotor coil 2 through the same steps as in the above embodiments. In this step of winding the binding material layer 4, the heat insulating material portion 11 is formed between the backup ring 3 and the inner periphery of the coil end portion A of the rotor coil 2. Heat transfer to the backup ring 3 is prevented.

  According to the method for manufacturing the rotor of the fourth embodiment performed as described above, in the step of winding the binding material layer, by providing the heat insulating material portion between the backup ring and the coil end portion of the rotor coil. Insulation prevents heat transfer from the binder layer to the backup ring, reduces thermal expansion of the backup ring when the binder layer is wound, and tension of the binder layer when the backup ring returns to room temperature It is possible to prevent the decrease. For this reason, the tension | tensile_strength of the bind material layer required at the time of winding of a bind material layer can be reduced, and size reduction of the delivery apparatus of a bind material layer, a rotation apparatus, etc. can be achieved. In addition, there is no need to prepare other new members, and the manufacturing is simple without increasing the number of manufacturing steps.

  In the fourth embodiment, an example in which the backup ring and the coil end portion of the rotor coil are thermally insulated by the heat insulating material portion is shown, but the present invention is not limited to this, and in the step of winding the bind material layer, Needless to say, it is sufficient to insulate the backup ring and the coil end of the rotor coil. Needless to say, in the fourth embodiment, a process for cooling the backup ring and the rotor may be added as shown in the first to third embodiments. For example, as shown in FIG. 6, a cooling device 8 and a thermometer 9 may be provided. In this case, if there is a possibility that the heat insulation shown in the fourth embodiment is insufficient, it goes without saying that the backup ring is more effectively cooled.

  In each of the above embodiments, the example in which the thermal expansion coefficient of the binding material layer is made of a material smaller than the thermal expansion coefficient of the backup ring has been shown. Needless to say, the same effect can be obtained even if the expansion coefficient is greater than or substantially the same as the thermal expansion coefficient of the backup ring. However, it goes without saying that each of these effects is remarkably obtained when the binding material layer is formed of a material whose thermal expansion coefficient is smaller than that of the backup ring.

It is a figure for demonstrating the manufacturing method of the rotor in Embodiment 1 of this invention. FIG. 2 is an enlarged cross-sectional view (corresponding to a portion X in FIG. 1) showing a configuration of a coil end portion of the rotor coil of the rotor shown in FIG. 1. FIG. 6 is an enlarged cross-sectional view (corresponding to a portion X in FIG. 1) showing a cross section showing a configuration of a coil end portion of a rotor coil of a rotor according to Embodiment 2 of the present invention. FIG. 10 is an enlarged cross-sectional view (corresponding to a portion X in FIG. 1) showing a cross section showing a configuration of a coil end portion of a rotor coil of a rotor according to Embodiment 3 of the present invention. FIG. 9 is an enlarged cross-sectional view (corresponding to a portion X in FIG. 1) showing a cross section showing a configuration of a coil end portion of a rotor coil of a rotor according to Embodiment 4 of the present invention; FIG. 10 is an enlarged cross-sectional view (corresponding to a portion X in FIG. 1) showing a cross section showing a configuration of a coil end portion of a rotor coil of another rotor according to Embodiment 4 of the present invention.

1 rotor core, 2 rotor coil, 2a lower opening coil, 2b upper opening coil,
3 Backup ring, 4a Lower binding material layer, 4b Upper binding material layer,
5 Feeding device, 6 Rotating device, 7, 8, 10 Cooling device, 9 Thermometer,
11 Heat insulation part, A Coil end part.

Claims (3)

A rotor core having a slot formed along the axial direction; a rotor coil having a coil end portion that is housed in the slot and exits in the axial direction from the slot; and a coil end portion of the rotor coil In a method for manufacturing a rotor comprising a backup ring disposed on the inner peripheral side of the rotor and a binding material layer wound around the outer periphery of the coil end portion of the rotor coil,
In the step of winding the binding material layer around the coil end portion of the rotor coil,
A method for producing a rotor, wherein the backup ring is wound while the binding material layer is heated while being cooled. The method for manufacturing a rotor according to claim 1, wherein the cooling of the backup ring is adjusted so as to obtain a desired temperature by measuring the temperature of the backup ring. In the step of winding the binding material layer around the coil end portion of the rotor coil,
  The method for manufacturing a rotor according to claim 1, wherein the rotor core is cooled.

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