JP2016220329A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence and progress of a water tree phenomenon of an insulation portion of a rotary electric machine.SOLUTION: A rotary electric machine 100 includes: a rotor 10 having a rotor shaft 11 and a rotor core 12 fixed to the rotor shaft 11; two bearings 31 supporting the rotor shaft 11; a stator 20 having a stator core 21 and stator windings 22 wound about the stator core 21; a frame 35 housing the rotor core 12 and the stator 20 and including cooling water for cooling the rotor core 12 and the stator 20 therein; two bearing brackets 36 being fixedly supported by the frame 35 and individually supporting the two bearings 31; and an ion removal device 50 having ion-exchange resin 52 for removing ions in the cooling water 201.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine that is driven or driven in water.

  A cable that is placed in water and used while being directly exposed to water is usually covered with an insulating portion made of a copper wire as a conductor made of a polymer material or the like. Here, as the polymer material, for example, a thermoplastic resin such as polyethylene or a thermosetting resin such as cross-linked polyethylene (hereinafter referred to as XLPE) is often used.

  In these insulated cables arranged in water, an AC voltage generated from a power supply device that generates an AC voltage having a commercial frequency of 50 Hz or 60 Hz or a DC / AC conversion power supply device that generates an AC voltage of various frequencies is applied and propagated.

  If such an insulated cable is used underwater for several years in a state where an AC voltage is applied in the above-described state, a water tree may be generated in an insulating part such as XLPE and may develop. It is known that the water tree is a tree-like insulation deterioration phenomenon that occurs in the insulating material of the insulating portion when an electric field acts on the insulating portion in a state where water coexists for a long time.

Japanese Patent No. 3600062 JP 58-172952 A Japanese Patent Publication No. 4-16885

  In a rotating electrical machine such as an electric motor that is driven or driven in water, the insulating portion is used in an underwater environment as described above. Under such conditions, it is important to monitor the deterioration state of the insulation performance due to the progress of the water tree, and a technique for monitoring is known (see Patent Document 1). Although monitoring of the deterioration state is important, it does not attempt to suppress the progress of deterioration.

  Regarding the technology for suppressing the progress of deterioration, for example, in the case of a three-phase motor, the progress of deterioration at the power supply side portion where higher voltage is applied between the power supply side portion and the neutral point side portion of the winding. Since it is fast, a technique is known in which the terminals on the power supply side and the neutral point side of the winding are alternately switched (see Patent Document 2). However, this technique is intended to extend the life by averaging the influence on each part of the winding under the condition that the environment where the water tree progresses exists.

  In addition, a technique is known in which an ion exchange material is mixed into an electrical insulator of a cable (see Patent Document 3). However, since ion exchange materials are saturated, it is difficult to take measures after saturation, for example, exchange of ion exchange materials.

  For this reason, the technique of ensuring the reliability of the rotary electric machine used especially underwater for a long term is desired. An object of this invention is to suppress generation | occurrence | production and progress of the water tree phenomenon of the insulation part of a rotary electric machine.

  In order to achieve the above-described object, the present invention is a rotating electrical machine that is driven or driven in water, and is a rotor shaft that is rotatably supported around a rotating shaft, and a rotor fixed to the rotor shaft. A rotor having an iron core; and two bearings for supporting the rotor shaft, arranged at positions sandwiching the rotor iron core in the axial direction of the rotor shaft, and arranged radially outside the rotor core. A stator having a stator core formed therein, a stator winding wound around the stator core, the rotor core and the stator are accommodated, and the rotor core and the stator are cooled. A frame containing the cooling water, two bearing brackets fixedly supported on the frame and supporting the two bearings, and an ion exchange resin for removing ions in the cooling water Characterized in that it comprises and on removing device.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production and progress of the water tree phenomenon of the insulation part of a rotary electric machine can be suppressed.

It is an elevation sectional view showing the composition of the rotary electric machine concerning a 1st embodiment of the present invention. It is an elevation sectional view showing the composition of the rotary electric machine concerning a 2nd embodiment of the present invention. It is an elevation sectional view showing the composition of the rotary electric machine concerning a 3rd embodiment of the present invention.

  Hereinafter, a rotating electrical machine according to an embodiment of the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is an elevational sectional view showing the configuration of the rotating electrical machine according to the first embodiment of the present invention. The rotating electrical machine 100 drives a pump 1 that is a target device to be driven in water. That is, the rotating electrical machine 100 drives the pump 1 that feeds water in the pump inlet pipe 3 to the pump outlet pipe 4. In the present embodiment, the rotating electrical machine 100 is installed in an environmental atmosphere 202 such as air, and includes the rotor 10, the stator 20, and the ion removing device 50.

  The rotor 10 includes a rotor shaft 11 that is horizontally supported so as to be supported horizontally, a rotor core 12 that is provided on the outer side in the radial direction of the rotor shaft 11, and a circulation propeller that is attached to the rotor shaft 11. 13 Both sides of the rotor shaft 11 across the rotor core 12 are supported by bearings 31, respectively. Note that the propeller 13 for circulation is not necessarily provided.

  The stator 20 passes through a plurality of slots (not shown) that are formed on the inner peripheral surface of the stator core 21 and extend in the axial direction on the radially outer side of the rotor core 12. The stator winding 22 is provided.

  The rotor core 12 and the stator 20 are accommodated in a frame 35. Both ends in the horizontal direction of the frame 35 are open, and bearing brackets 36 are provided so as to close the respective open portions. Each bearing bracket 36 supports a bearing 31.

  An ion removing device 50 is provided outside the frame 35. The ion removing device 50 includes a casing 51, an ion exchange resin 52 accommodated in the casing 51, a cooling water inlet pipe 57, and a cooling water outlet pipe 58. The ion exchange resin 52 is granular and is stored in the resin storage portion 52a. The ion exchange resin 52 includes at least a cation exchange resin.

As the cation exchange resin, there are a strong acid cation exchange resin and a weak acid cation exchange resin. The strongly acidic cation exchange resin has, for example, a sulfonic acid group (—SO ₃ H) as an exchange group. A strong acid cation exchange resin dissociates like hydrochloric acid, sulfuric acid, etc., shows strong acidity, and can exchange a cation. Strong acid cation exchange resins can be used in all pH ranges.

  The weakly acidic cation exchange resin has, for example, a carboxylic acid group (—COOH) as an exchange group. There is a limit to the usable pH range. The weak acid cation exchange resin adsorption (selectivity) for various ions is roughly similar to that of strongly acidic cation exchange resin, and the higher the valence ion, the greater the selectivity, but the selectivity for hydrogen ions. Is very big.

  The resin storage portion 52a is formed so that the inside of the ion exchange resin 52 is stored and the cooling water 201 can pass therethrough. The resin storage part 52a may be, for example, a basket, a container formed of a perforated plate, or a column extending in the flow direction of the cooling water. Alternatively, a wire mesh container may be used.

  The casing 51 is attached to the outside of the frame 35, and the space in the casing 51 and the space in the frame 35 are directly connected by a communication opening 35a. The resin storage portion 52a is detachably attached to the casing 51. The casing 51 is provided with an opening / closing lid 54 so that the resin storage portion 52a can be removed and replaced.

  The space in the casing 51 and the space in the pump outlet pipe 4 are connected by a cooling water inlet pipe 57. The cooling water inlet pipe 57 is provided with a pressure regulating valve 57a, a pressure transmitter 57b provided on the casing side of the pressure regulating valve 57a, and a stop valve 57c provided on the pump outlet pipe 4 side of the pressure regulating valve 57a. It has been.

  The cooling water 201 that has flowed into the cooling water inlet pipe 57 from the pump outlet pipe 4 flows into the casing 51 and flows into the frame 35 through the communication opening 53. The ion exchange resin 52 is arranged so as to block the flow path in the casing 51, and the entire amount of the cooling water 201 passing through the casing 51 passes through the ion exchange resin 52. The pressure control valve 57a sends a pressure signal from the pressure transmitter 57b on the downstream side of the ion exchange resin 52 and later so that the discharge pressure of the pump 1 is not directly applied to the ion exchange resin 52 and later. Adjust to a correct value.

  The space in the frame 35 and the space in the pump inlet pipe 3 are connected by a cooling water outlet pipe 58, and the cooling water outlet pipe 58 is opened in the frame 35 by a communication opening 35b. The communication opening 35 a and the communication opening 35 b are formed on the opposite sides of the rotor core 12 and the stator 20 in the axial direction of the frame 35.

  The cooling water outlet pipe 58 is provided with a stop valve 58a. The stop valve 58a, together with the stop valve 57c, can isolate the rotating electrical machine 100 from the pump inlet pipe 3 and the pump outlet pipe 4 side. For this reason, for example, when the ion exchange capacity of the ion exchange resin 52 is lowered, the opening / closing lid 54 is opened and the resin storage portion 52a is taken out and the ion exchange resin 52 is regenerated or replaced with a new one even during operation of the rotary electric machine 100. can do.

  Next, the operation of the present embodiment configured as described above will be described. When the rotary electric machine 100 is in operation and the pump 1 is rotating, the pressure in the pump outlet pipe 4 is substantially higher than the pressure in the pump inlet pipe 3 by the pump head. A part of the water in the pump outlet pipe 4 flows into the cooling water inlet pipe 57 branched from the pump outlet pipe 4 as the cooling water 201. The cooling water 201 flows into the casing 51, passes through the ion exchange resin 52, flows out of the communication opening 53, and flows into the frame 35 from the communication opening 35 a of the frame 35.

  The cooling water 201 flowing into the frame 35 cools the rotor 10 and the stator 20, then flows out from the communication opening 35 b to the cooling water outlet pipe 58 and reaches the pump inlet pipe 3. Since the pressure in the pump outlet pipe 4 is higher than the pressure in the pump inlet pipe 3, the flow path of the cooling water 201 passing through the frame 35 forms a recirculation flow path when viewed from the flow path of the pump 1. Further, the driving force of the recirculation flow is further increased by the circulation propeller 13.

  The cooling capacity in the frame 35 increases as the flow rate of the cooling water 201 increases. On the other hand, the ion concentration in the cooling water 201 after passing through the ion exchange resin 52 increases as the flow rate of the cooling water 201 increases. That is, the ion removing ability is lowered.

  Here, the conditions given to the head of the pump include the flow resistance of the cooling water 201, the flow resistance of the recirculation flow path, the presence / absence of the circulation propeller 13, and the head of the circulation propeller 13. Increasing the flow resistance of the recirculation flow path decreases the flow rate of the cooling water 201. On the other hand, providing the circulating propeller 13 and increasing the head increase the flow rate of the cooling water 201.

  The ion removal capability can be improved by increasing the passage time of the cooling water 201 through the ion exchange resin 52. Increasing the passage time of the cooling water 201 through the ion exchange resin 52 increases the passage cross section of the cooling water 201 in the ion exchange resin 52 and increases the passage length of the cooling water 201 in the ion exchange resin 52. This can be achieved.

  From the above, it is possible to secure a predetermined level of cooling capacity and a predetermined level of ion exchange capacity.

  As described above, the rotating electrical machine 100 according to the present embodiment flows into the frame 35 after removing cations in the cooling water 201. As a result, the insulator of the portion to which the voltage such as the stator winding 22 in the frame 35 is applied is in the environment of the cooling water 201 from which cations are removed to a predetermined level or less. For this reason, generation | occurrence | production and progress of a water tree are suppressed significantly.

[Second Embodiment]
FIG. 2 is an elevational sectional view showing the configuration of the rotating electrical machine according to the second embodiment of the present invention. This embodiment is a modification of the first embodiment. In the second embodiment, for example, the rotating field has little heat generation from the rotor, such as a rotating electric machine using a permanent magnet of the rotor, and heat conduction is performed even if the rotor is not actively cooled by cooling water. This is an embodiment when heat is sufficiently dissipated.

  The rotating electrical machine 100 according to the second embodiment has a frame partition cylinder 40. The inner partition cylinder 40 has a cylindrical shape centered on the rotation axis of the rotor shaft 11, extends in the axial direction, and both ends are airtightly coupled to the bearing bracket 36. Further, the inner partition cylinder 40 is provided on the outer side of the outer surface of the rotor core 12 and on the inner side of the inner surface of the stator core 21 in the radial direction. In other words, the intra-frame partition tube 40 divides the inside of the frame 36 into two sections of an inner region and an outer region in the radial direction. The rotor 10 is disposed in the inner region, and the stator 20 is disposed in the outer region. The cooling water 201 flows in the outer region.

  On the other hand, cooling water does not flow in the inner region. Further, no circulation propeller is provided. This is because when the heat generation amount in the inner region is low, heat input from the circulating propeller cannot be ignored. Depending on the degree of heat generation, it may be advantageous to provide a circulation propeller in order to promote heat exchange between the front and back sides of the inner partition cylinder 40. In this case, it may be provided.

  While the rotary electric machine 100 is in operation and the pump 1 is rotating, a part of the water in the pump outlet pipe 4 flows into the cooling water inlet pipe 57 branched from the pump outlet pipe 4 as the cooling water 201. The cooling water 201 flows into the casing 51, passes through the ion exchange resin 52, flows out of the communication opening 53, and flows into the frame 35 from the communication opening 35 a of the frame 35.

  The cooling water 201 that has flowed into the frame 35 passes through the outer region of the intra-frame partition tube 40 in the frame 36, cools the stator 20, and then flows out from the communication opening 35 b to the cooling water outlet pipe 58 to enter the pump inlet. It reaches the pipe 3.

  According to the present embodiment as described above, the flow rate of the cooling water 201 passing through the frame 35 is reduced as compared with the case where the intra-frame partition tube 40 is not provided. As a result, the flow rate of the cooling water 201 passing through the ion exchange resin 52 becomes low. Or it becomes possible to reduce the passage area of the cooling water 201 of the ion exchange resin 52, and to make it more compact.

  Further, since the flow rate of the cooling water 201, that is, the flow rate of recirculation is reduced, the substantial efficiency of driving by the pump 1 is also considered from the viewpoint of driving the water in the pump inlet pipe 3 and the pump outlet pipe 4 of the pump 1. Can be improved.

[Third Embodiment]
FIG. 3 is an elevational sectional view showing the configuration of the rotating electrical machine according to the third embodiment of the present invention. The rotating electrical machine 100 in this embodiment is immersed in water and drives the pump 2. That is, the rotating electrical machine 100 is in the environment of the environmental water 204. The rotating electrical machine 100 includes a rotor 10, a stator 20, a bearing 31, a frame 35, a bearing bracket 36, and an ion removing device 50.

  The configurations of the rotor 10, the stator 20, the bearing 31, the frame 35, and the bearing bracket 36 are the same as those in the first embodiment. A circulation propeller 13 is attached to the rotor shaft 11. The circulation propeller 13 drives the fluid in a direction opposite to the rotor core 12 and the stator 20 (right direction in FIG. 3). The direction may be the opposite direction, that is, the direction of flowing into the ion exchange resin 52 after passing through the rotor core 12 and the stator 20. However, in order to protect the ion exchange resin 52, when the temperature rise is large, it is desirable to flow into the ion exchange resin 52 before the temperature rises.

  The ion removing device 50 includes a casing 51 and an ion exchange resin 52. The casing 51 is provided outside the frame 35. The space in the casing 51 and the space in the frame 35 communicate with each other through the communication opening 55 and the communication opening 56. The casing 51 and the frame 35 are combined with each other to form a sealed space 60. The sealed space 60 is filled with cooling water 203.

  The communication opening 55 and the communication opening 56 are located on the opposite sides of the rotor core 12 and the stator 20 with respect to the axial direction of the rotor shaft 11. In the casing 51, a resin storage portion 52a that stores the ion exchange resin 52 is provided. The resin storage part 52 a is formed so as to hold the ion exchange resin 52 and pass the cooling water 203.

  The resin storage portion 52 a is provided between the communication opening 55 and the communication opening 56 in the axial direction of the rotor shaft 11. The ion exchange resin 52 stored in the resin storage portion 52a is provided so as to block the cross section of the flow path so that the entire amount of the cooling water 203 flowing in the casing 51 passes through the ion exchange resin 52.

  In the present embodiment configured as described above, the rotor shaft 11 rotates while the rotating electrical machine 100 is in operation. As a result, the circulating propeller 13 rotates and the cooling water 203 in the sealed space 60 is driven. The cooling water 203 flows from the circulation propeller 13 into the casing 51 through the communication opening 55. The cooling water 203 that has flowed into the casing 51 passes through the ion exchange resin 52 filled in the resin storage portion 52 a, flows out of the communication opening 56, and flows into the frame 35.

  The cooling water 203 flowing into the frame 35 cools the inside of the frame 35 such as the rotor core 12 and the stator 20. That is, the cooling water 203 receives heat from the rotor core 12, the stator 20, and the like, passes through the frame 35 while increasing its own temperature, and flows out to the circulating propeller 13 side. Thus, the cooling water 203 exchanges heat between the frame 35 and the environmental water 204 outside the casing 51 in the process of circulating in the sealed space 60, and the heat of the cooling water 203 moves to the environmental water 204. .

  Thus, the heat generated from the rotor core 12 and the stator 20 is transferred from the cooling water 203 to the environmental water 204, and the cooling state of the rotor core 12 and the stator 20 during the operation of the rotating electrical machine 100 is changed. Maintained.

  Regarding the water quality inside the rotating electrical machine 100, as described above, during the operation of the rotating electrical machine 100, the cooling water 203 passes through the ion exchange resin 52, and the cooling water 203 is only stored in the sealed space 60. Therefore, the cation concentration in the cooling water 203 is maintained at a low level because water having a high cation level does not flow in from the outside. In addition, when the ion exchange resin 52 is saturated, the resin storage portion 52 a that stores the ion exchange resin 52 can be taken in and out of the opening / closing lid 54 provided in the casing 51 and can be replaced with a new ion exchange resin 52. is there.

  As described above, in the rotating electrical machine 100 according to the present embodiment, the cations in the cooling water 203 are maintained at a low level. As a result, the insulator of the portion to which the voltage such as the stator winding 22 in the frame 35 is applied is in the environment of the cooling water 203 in which cations are removed to a predetermined level or less. For this reason, generation | occurrence | production and progress of a water tree are suppressed significantly.

[Other Embodiments]
As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. For example, in the rotating electrical machine 100 in the embodiment, an example of an electric motor that is coupled to the pump 1 or the pump 2 and drives them is shown, but the present invention is not limited to this.

  For example, the device to be driven or the device to be driven may be a water wheel, and the rotating electrical machine may be a generator that is coupled thereto. Moreover, the motor | power_engine which drives a rotary electric machine, or the case where the load which a rotary electric machine drives is not in water may be sufficient. In the first embodiment, the rotating electric machine 100 is provided in the environmental atmosphere 202 such as air. However, the rotating electric machine 100 may be provided in water.

  Furthermore, the embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1, 2 ... Pump, 3 ... Pump inlet piping, 4 ... Pump outlet piping, 10 ... Rotor, 11 ... Rotor shaft, 12 ... Rotor core, 13 ... Circulation propeller, 20 ... Stator, 21 ... Stator core 22 ... Stator winding, 31 ... Bearing, 35 ... Frame, 35a, 35b ... Communication opening, 36 ... Bearing bracket, 40 ... Frame partition cylinder, 50 ... Ion remover, 51 ... Casing, 52 ... Ion exchange resin 52a ... resin housing, 53 ... communication opening, 54 ... opening / closing lid, 55,56 ... communication opening, 57 ... cooling water inlet piping, 57a ... pressure regulating valve, 57b ... pressure transmitter, 57c ... stop valve, 58 ... Cooling water outlet pipe, 58a ... stop valve, 60 ... sealed space, 100 ... rotary electric machine, 201 ... cooling water, 202 ... environment atmosphere, 203 ... cooling water, 204 ... environment water

Claims (5)

A rotating electrical machine driven or driven in water,
A rotor having a rotor shaft rotatably supported around a rotation axis, and a rotor core fixed to the rotor shaft;
Two bearings respectively disposed at positions sandwiching the rotor core in the axial direction of the rotor shaft and supporting the rotor shaft;
A stator core having a stator core disposed radially outside the rotor core, and a stator winding wound around the stator core;
A frame that houses the rotor core and the stator, and contains cooling water for cooling the rotor core and the stator;
Two bearing brackets fixedly supported by the frame and supporting the two bearings, respectively;
An ion removing device having an ion exchange resin for removing ions in the cooling water;
A rotating electric machine comprising:   The rotating electrical machine according to claim 1, wherein the ion exchange resin is a cation exchange resin. A resin storage unit configured to store the ion exchange resin and to allow the cooling water to pass through;
A casing provided outside the frame to store the resin storage portion and a communication opening formed between the casing and the frame;
A cooling water inlet pipe connecting the pump outlet pipe on the outlet side of the pump to be driven and the casing;
A cooling water outlet pipe connecting the pump inlet pipe on the inlet side of the pump and the communicating opening and a portion on the opposite side in the axial direction across the stator in the frame;
The rotating electrical machine according to claim 1, further comprising: A casing provided outside the frame to store the resin storage portion and a communication opening formed between the casing and the frame;
A resin storage portion disposed in the casing for storing the ion-exchange resin and formed to allow the cooling water to pass through;
A circulating propeller attached to the rotor shaft;
Further comprising
The casing and the frame are combined with each other to form a sealed space, and the cooling water communicates so as to be able to flow into the frame after passing through the ion exchange resin in the casing, and flows into the frame. The rotating electrical machine according to claim 1 or 2, wherein the cooling water is communicated so as to be able to flow into the casing again after passing through the region where the stator is disposed in the axial direction.   The said casing is formed with an inlet / outlet for exchanging the ion exchange resin, and an opening / closing lid for sealing the inlet / outlet to be closed is attached. Rotating electric machine.

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