JP5319509B2 - Replacement method of rotor coil of variable speed generator motor - Google Patents

Description

  The present invention relates to a method for replacing a rotor coil of a variable speed generator-motor.

A rotor of a conventional variable speed generator motor includes a rotor core formed of a laminate of thin steel plates, and a coil end portion that is formed in a slot provided on the outer periphery of the rotor core and that extends outward from the slot in the axial direction. , A backup ring that supports the coil end portion of the rotor coil, and a binding material for fixing the coil end portion of the rotor coil to the backup ring.
The rotor coil housed in the slot usually has a two-layer winding structure of a half coil. Therefore, the rotor coil is composed of a lower coil on the inner diameter side and an upper coil on the outer diameter side. The center spacer is sandwiched between the mouth coils, a wedge is inserted on the outer diameter side of the rotor coil, and the wedge is engaged with the groove of the rotor, thereby holding the centrifugal force. On the other hand, the coil end portion of the rotor coil holds the coil end portion against the backup ring and holds it against the centrifugal force by applying a tension from the outer diameter side to the backup ring on the inner diameter side and winding the binding material.

  Moreover, the structure of the binding material is that the lower end coil is inserted into the slot and then the binding material is applied on the lower side in the axial direction and the upper side in the axial direction of the coil end portion of the lower end coil. After that, the upper opening coil is inserted into the slot, the lower opening coil and the upper opening coil are connected, and then the binding material is constructed on the axially lower side and the axially upper side of the coil end portion of the upper opening coil. (For example, refer to Patent Document 1).

If one of the rotor coils needs to be replaced due to a ground fault due to an accident or the like, the rotor coil must be taken out unless the axially lower and axially upper binding materials of the coil end portions of the rotor coil are disassembled. However, there was a problem that the range of disassembly was wide and the construction period was long.
Patent Document 2 shows a method of replacing a stator coil that reduces the disassembly range.
Remove the binding wire that fixes the coil end of the stator coil that is exposed from the stator core, cut off the cut off part of the coil end, and replace the stator coil cut at this cut off part with a new stator coil. The conductor on the slot side of the new stator coil that fits in the slot and the conductor on the cut coil end side are reconnected by the connecting means, and the conductor connected by this connecting means is insulated by the insulating means. In addition, there is one that fixes the coil end portion of the stator coil with a bind wire.

JP 2006-141103 A (6th page, FIGS. 2 to 3) JP-A-8-19200 (pages 3-4, FIGS. 1-3, FIG. 8)

  In the stator coil replacement method of the prior art, the stator coils in the slots are individually replaced by individually removing the binding wires that fix the stator coils and cutting off the coil end portions. However, the rotor coil binding material is fixed by winding the coil end portions of the rotor coil on the circumference of the backup ring together, so one rotor coil is replaced. Even in this case, it is necessary to remove all the binding materials, and there is a problem that the range to be disassembled becomes wide.

  An object of the present invention is to make it possible to reduce the range for disassembling the binding material of the rotor coil, and to easily replace the rotor coil in a short period of time.

The present invention, a portion of the binding material in the vicinity of both end portions of the rotor core is removed, respectively, the coil end portions of the rotor coils is cut respectively bound material removing unit this removed, the rotor coil in the slot After the new coil cut to the same length as the extracted rotor coil is inserted into the slot, the conductor of the new coil and the conductor of the existing coil end are connected to each other , and insulation is provided at and near the connection location. After the construction, the binding material is again wound around the binding material removing portion.

The present invention, a portion of the binding material in the vicinity of both end portions of the rotor core is removed, respectively, the coil end portions of the rotor coils is cut respectively bound material removing unit this removed, the rotor coil in the slot After the new coil cut to the same length as the extracted rotor coil is inserted into the slot, the conductor of the new coil and the conductor of the existing coil end are connected to each other , and insulation is provided at and near the connection location. By winding the binding material again around the binding material removing portion after the construction, the range of disassembling the binding material of the rotor coil can be reduced, and the rotor coil can be easily replaced in a short period of time.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing of the axial direction of the rotor of the variable speed generator motor which shows Embodiment 1 of this invention. Sectional drawing (slot part) of the radial direction of the rotor core part of a variable speed generator motor. Sectional drawing of the axial direction of the rotor of the variable speed generator motor which shows Embodiment 2 of this invention. The enlarged view of the rotor coil strand of the variable speed generator motor which shows Embodiment 3 of this invention. The schematic diagram of the rotor coil element | wire of a variable speed generator motor to which label shift was given. The schematic diagram of the rotor coil strand of the variable speed generator motor which shows Embodiment 3 of this invention. The schematic diagram of the rotor coil strand at the time of connecting each strand collectively in Embodiment 1 or Embodiment 2 of this invention. The enlarged view of the rotor coil strand of the variable speed generator motor which shows Embodiment 4 of this invention. The figure which shows the binding material coil | winding of the coil end part of the rotor coil of the conventional variable speed generator motor. The figure which shows the binding material coil | winding of the coil end part of the rotor coil of the variable speed generator motor by Embodiment 5 of this invention. The figure which shows the binding material coil | winding of the coil end part of the rotor coil of the variable speed generator motor by Embodiment 6 of this invention.

Embodiment 1 FIG.
FIG. 1 is a sectional view in the axial direction of a rotor of a variable speed generator-motor showing Embodiment 1, and shows a method for replacing a lower coil, and (a) to (d) are steps in the replacement method in order. Is shown.
FIG. 2 is a radial sectional view (slot portion) of the rotor core portion of the variable speed generator-motor.
In FIG. 1, 1 is a rotor core, 2 (2a to 2f) is a rotor coil, 3a is a lower backup ring, 3b is an upper backup ring, 4 (4a to 4d) is a binding material, and 5a is below an upper opening coil. The removal part of the side binding material 4c, 5b is the removal part of the upper binding material 4d of the upper coil, 6a is the new lower coil, 6b is the new upper coil, 7a is the rewinding part of the lower binding material of the upper coil , 7b are rewind portions of the upper binding material of the upper coil. In FIG. 2, 8 is a wedge and 9 is a center spacer.

A method for replacing the lower coil will be described with reference to FIG.
In FIG. 1A, the vicinity of the rotor core end 5a of the lower binding member 4c of the upper opening coil and the vicinity of the rotor core end 5b of the upper binding member 4d of the upper opening coil are removed. The range to be removed is a range that does not hinder the work and is, for example, about 300 mm on the lower side and the upper side in the axial direction.
Next, in FIG.1 (b), the coil end part (axial direction lower side) 2d of an upper opening coil and the coil end part (axial direction upper side) 2e of an upper opening coil are cut | disconnected from the location which removed the binding material, The wedge 8 (not shown) in the slot is disassembled, and the cut upper coil (slot portion) 2f and center spacer 9 (not shown) are taken out. After that, the lower end coil is cut from the slot by cutting the coil end portion (downward in the axial direction) 2a of the lower end coil and the coil end portion (upper side in the axial direction) 2b of the lower end coil from the place where the binding material is removed. (Slot) 2c is taken out.

Next, in FIG. 1C, a new lower coil 6a cut to substantially the same length as the lower coil 2c taken out in FIG. 1B is inserted into the slot, and the conductor of the new lower coil 6a is inserted. And the conductor of the coil end part (axially lower side) 2a of the lower coil, and the conductor of the new lower coil 6a and the coil end part (axially upper side) 2b of the lower coil, respectively, Insulate the vicinity. An example of the connection method is brazing. Thereafter, the center spacer 9 (not shown) is placed in the slot, and a new upper coil 6b cut to the same length as the upper coil 2f taken out in FIG. 1 (b) is inserted into the slot. The conductor of the upper opening coil 6b and the conductor of the coil end portion (downward in the axial direction) 2d of the upper opening coil, and the conductor of the new upper opening coil 6b and the coil end portion (upper axial direction) 2e of the upper opening coil, respectively. The connection is made by a method such as brazing, insulation is performed at and near the connection location, and a wedge 8 (not shown) is inserted.
Next, in FIG. 1 (d), the rewinding portion 7a of the lower binding material of the upper coil and the rewinding location 7b of the upper binding material of the upper coil in which the binding material is removed in FIG. 1 (a). Wrap the binding material. Thereafter, the binding material is cured as necessary. However, these operations are normal operations and are not specific to the first embodiment, and thus the description thereof is omitted.

In the prior art of Patent Document 1, when replacing one lower opening coil, after disassembling all the lower and upper binding materials of the upper opening coil and removing all the upper opening coils from the slots, It is necessary to disassemble all the lower and upper binding materials and to remove the lower coil to be replaced from the inside of the slot.
According to the first embodiment, as described above, the lower and upper binding materials of the upper coil are partially disassembled (removed), and the coil is removed at the upper coil binding material removal portion on the lower coil to be replaced. After cutting the end portion and pulling out one upper coil from the slot, the coil end portion of the lower coil can be cut and the lower coil to be replaced can be pulled out from the slot. The range for disassembling the coil binding material can be reduced, and by reducing the number of upper opening coils that can be pulled out of the slot, the disassembly / assembly process can be shortened and the rotor coil can be easily replaced in a short period of time. It becomes possible.

Embodiment 2. FIG.
FIG. 3 is a sectional view in the axial direction of the rotor of the variable speed generator-motor shown in the second embodiment.
As shown in FIG. 3, the cutting position of the coil according to the second embodiment is such that the cutting position of the lower coil is the position closer to the rotor core than the cutting position of the upper coil.
In Embodiment 1, when cutting the coil end portion of the lower end coil, since the operation is performed from the binding material removing portion toward the inner diameter side, the operation is performed in a very narrow space, and the remaining upper end coil The coil end part of this becomes an obstacle to work. Similarly, when the lower coil is brazed or insulated, the coil end of the upper coil becomes an obstacle to work.
According to the second embodiment, as described above, by setting the cutting position of the lower coil to the position closer to the rotor core than the cutting position of the upper coil, a work space can be secured and workability is improved.

Embodiment 3 FIG.
FIG. 4 is an enlarged view of the rotor coil wire of the variable speed generator-motor showing the third embodiment. FIG. 5 is a schematic diagram of a rotor coil element wire of a variable speed generator-motor that has been subjected to label shift. FIG. 6 is a schematic diagram of a rotor coil wire of the variable speed generator-motor shown in the third embodiment. FIG. 7 is a schematic diagram of the rotor coil strands when the strands are connected together in the first embodiment or the second embodiment.
In FIG. 4, 10 is a wire of the rotor coil, and 11 is a brazing point.
As shown in FIG. 4, the conductors of the third embodiment are connected to each other by brazing and connecting the new coil wire and the coil end wire one by one. Insert a sheet (not shown) and insulate.

Next, the operation of the third embodiment will be described based on FIG. 5, FIG. 6, and FIG.
Usually, a rotor coil forms a single coil by bundling a plurality of insulated wires in order to reduce eddy current loss generated in a coil conductor. On the other hand, at both ends of the coil end portion of the rotor coil, the coil group is usually connected by brazing the element group of the upper coil and the element group of the lower coil to the connecting copper plate to form a winding. Here, each half coil is in a state in which each strand is short-circuited at both ends of the coil end portion. Therefore, a circulating current flows between the strands when an alternating magnetic field is linked to the coil, and the circulating current flows. Loss occurs. In order to reduce this circulating current loss, label dislocation may be given to each strand.
In FIG. 5, each solid line represents one strand, and each strand is short-circuited at both ends of the coil end portion and is subjected to label dislocation at the rotor core portion.

As shown in FIG. 7, the conductor connection of the first embodiment or the second embodiment is connected in a lump without connecting the element wire of the new coil and the element wire of the coil end part for each element wire. To do. Therefore, dislocation is not performed between the batch connection point (short-circuit between the strands) and the tip of the coil end, and when an alternating magnetic field is applied to this location, a circulating current flows between the strands. Loss occurs.
According to the third embodiment, as described above, the strands are connected one by one, and the strands are insulated to form a schematic diagram of the connection state of the strands as shown in FIG. Since it becomes the same, the non-dislocation part in a coil end part does not generate | occur | produce and the increase in the loss by circulating current can be suppressed.

Embodiment 4 FIG.
FIG. 8 is an enlarged view of a rotor coil element wire of the variable speed generator-motor shown in the fourth embodiment.
As shown in FIG. 8, the conductors of the fourth embodiment are connected by alternately arranging long and short cutting positions of the strands of the new coil and the coil end portion. The two wires are brazed by engaging the wires, and an insulation sheet (not shown) is inserted between each of the two wires connected after the completion of brazing and the other two wires to insulate them.
According to the fourth embodiment, there is no need to butt and braze the wires one by one as in the third embodiment, and the brazing operation is facilitated.
Further, as described above, when brazing is performed every two strands by combining the long and short cutting positions of each strand, the brazing area is increased compared to the butt brazing of the third embodiment. This not only facilitates the brazing operation, but also improves the mechanical strength at the connection.

Embodiment 5 FIG.
FIG. 9 is a diagram showing a binding material winding of a coil end portion of a rotor coil of a conventional variable speed generator-motor. FIG. 10 is a diagram showing the binding material windings of the coil end portion of the rotor coil of the variable speed generator-motor according to the fifth embodiment.
In FIG. 9, reference numeral 12 denotes a normal upper coil coil binding material winding range. In FIG. 10, 13 is a range in which the binding material is removed when the rotor coil is replaced, and 14 is a range in which the binding material is not removed when the rotor coil is replaced.

Next, the operation of the fifth embodiment will be described with reference to FIGS.
Normally, the binding material winding work at the coil end of the rotor coil is performed by placing the rotor on a turntable or other turntable and applying a tension to the binding material and rotating the rotor at a low speed. Wrap the material. In the conventional rotor of the variable speed generator motor, as shown in FIG. 9, the binding material is continuously wound from the end of the rotor core to the end of the coil end of the rotor coil.
In the binding material winding operation according to the fifth embodiment, as shown in FIG. 10, the binding material is folded and wound in each of the binding material removal range 13 and the binding material removal range 14.
According to the fifth embodiment, as described above, since the binding material is separated in the range where the binding material is removed and the range where the binding material is not removed, the workability when removing the binding material when the rotor coil is replaced. As a result, the rotor coil can be replaced in a shorter period of time.

Embodiment 6 FIG.
FIG. 11 is a diagram illustrating a binding material winding of a coil end portion of a rotor coil of a variable speed generator-motor according to a sixth embodiment.
In FIG. 11, 15 is a range in which the winding tension of the binding material is lowered and lowered from other portions.

Next, the operation of the sixth embodiment will be described.
When replacing the rotor coil that has been subjected to the binding material winding operation of the fifth embodiment, when removing the lower binding material removal portion 5a of the upper opening coil and the upper binding material removal portion 5b of the upper opening coil, When the binding material of the part is wound with high tension, the high tension held at the time of cutting the binding material is abruptly released, and the binding material may be ruptured, resulting in danger to the operator.
On the other hand, since the winding tension of the binding material is determined by the centrifugal force or the like acting when the rotor rotates, if the winding tension of the binding material is uniformly reduced, a problem in strength occurs in the rotor coil during rotation.
According to the sixth embodiment, as shown in FIG. 11, the tension is wound only in a range where the binding material is removed to be lower than the other parts, thereby ensuring the strength required for the rotor coil and the rotor. When replacing the coil, the safety and workability when disassembling the binding material are improved.

DESCRIPTION OF SYMBOLS 1 ... Rotor core 2 (2a-2f) ... Rotor coil 2a ... Coil end part of lower coil (Axis direction lower side)
2b ... Coil end of lower coil (Axial upper side)
2c ... Lower coil (slot part)
2d ... Coil end of upper coil (lower side in the axial direction)
2e ... Coil end of upper coil (upper axial)
2f ... Upper coil (slot part)
3a ... Lower backup ring 3b ... Upper backup ring 4 (4a-4d) ... Binding material 4a ... Lower binding material of lower coil 4b ... Upper binding material of lower coil 4c. .. Lower binding material of upper coil 4d ... Upper binding material of upper coil 5a ... Removal portion of lower binding material 4c of upper coil 5b ... of upper binding material 4d of upper coil Removal part 6a ... New lower coil 6b ... New upper coil 7a ... Rewinding part of lower binding material of upper coil 7b ... Rewinding part of upper binding material of upper coil 8 ... Wedge 9 ... Center spacer 10 ... Rotor coil element wire 11 ... Brazing point 12 ... Ordinary upper coil binding material winding range 13 ... When replacing the rotor coil Range to remove the binding material 14 ... Range to remove the binding material when replacing the rotor coil Range 15: Range in which the winding tension of the binding material is lowered below other parts

Claims (6)

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 in the axial direction from the slot; and a coil end portion of the rotor coil In the method of replacing the rotor coil of the variable speed generator motor provided with the binding material wound around the outer diameter side of
Some bind materials in the vicinity of both end portions of the rotor core is removed, respectively, the coil end portions of the rotor coils is cut respectively bound material removing unit This removed, remove the rotor coil in the slot, withdrawn and after inserting a new coil cut to length comparable to the rotor coil in the slot, wherein the conductor of the conductor and the coil end portion of the new coil is connected respectively, after construction of the insulation connection portion and the vicinity thereof, A method for exchanging a rotor coil, wherein a binding material is wound around the binding material removing section. The rotor coil housed in the slot has a two-layer winding structure composed of an outer diameter side upper opening coil and an inner diameter side lower opening coil,
2. The method of replacing a rotor coil according to claim 1, wherein when the lower opening coil is replaced, the cutting position of the lower opening coil is set closer to the rotor core than the cutting position of the upper opening coil. The connection between the new coil and the coil end conductor is as follows:
2. The method of replacing a rotor coil according to claim 1, wherein the wires of the rotor coil are connected one by one and the connected wires are insulated. The connection between the new coil and the coil end conductor is as follows:
2. The method of replacing a rotor coil according to claim 1, wherein two strands of the rotor coil are connected to each other, and the two connected strands are insulated from the other two strands. The binding material has a structure in which the binding material is removed when the rotor coil is replaced, and a range in which the binding material is not removed, and the binding material is wound in each range.
Replacing rotor coil according to any one of claims 1 to 4. The binding material is a structure in which the binding material in a range in which the binding material is removed when the rotor coil is replaced is wound in advance with a lower tension than other parts.
The rotor coil replacement method according to claim 5.

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