JP2012115113A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of preventing deterioration and burnout of a corona shield layer extending outside of a slot of a stator core with easy means.SOLUTION: The rotary electric machine, operated at a voltage having a high frequency component, is mounted with a stator coil 7, formed with a corona shield layer 14 on a surface of a main insulation layer, in a slot 6 of a stator core through a slot liner 12, and is provided with charging current relaxing means (17, 18, 19, 20, 21 and 22) between the slot liner 12 of the stator coil 7 extending outside of the slot and the corona shield layer 14 to relax charging current.

Description

  The present invention relates to a rotating electrical machine such as an electric motor or a generator, and more particularly to a rotating electrical machine suitable for one driven by a voltage having a high frequency component.

  In recent years, rotating electrical machines have been driven with a voltage having a high-frequency component in order to increase operating efficiency. The drive voltage having the high frequency component is obtained by a high frequency power source configured by a high speed switching element such as an IGBT, and the high frequency power source is connected to the rotating electrical machine via a cable. As disclosed in Patent Document 1, usually, a stator coil of a rotating electrical machine has a corona shield layer coated on a surface of a main insulating layer applied to a coil conductor, and the stator coil is a stator coil. A slot formed on the inner diameter side of the iron core is mounted via a semiconductive slot liner, and is fixed to the stator core by a wedge.

JP 2003-164091 A

  In the stator coil of the rotating electrical machine described in Patent Document 1, since the contact between the corona shield layer and the slot liner in the slot of the stator core is relatively well maintained, the corona shield layer and the slot liner Contact substantially over the entire area, and as a result, the charging current proportional to the time change of the input voltage to the rotating electrical machine is distributed over the entire area.

  However, the contact between the corona shield layer and the slot liner at the core exit portion of the stator coil protruding from the slot end of the stator core may be partly due to the warp or undulation of the slot liner due to the manufacturing conditions. .

  In many cases, the slot liner is made of a sheet material having a conductive coating applied to a base material. The slot liner is wound around the stator coil in a spiral manner, and is attached to the stator core together with the stator coil. At this time, the slot liner may be partially formed with a slight warp or swell at the time of manufacture. In particular, since the slot liner is the outermost layer of the coil at the core exit, partial contact is caused by warping or undulation regardless of the so-called single injection, resin rich, or total impregnation of resin in the manufacture of the stator. It may be formed.

  In particular, in the so-called all-impregnation insulation method, which is aimed at reducing costs and improving the cooling efficiency of the stator, the entire stator is impregnated and cured with resin after the stator coil is incorporated in the stator core. Since there is no pressure mold, in addition to the warp and undulation of the slot liner, the stator coil itself tends to be thickened due to the penetration of the varnish, and partial contact may occur remarkably.

  Therefore, at the core outlet portion of the rotating electrical machine via these slot liners, there is a possibility that the charging current proportional to the time change of the input voltage flows in a concentrated manner at the partial contact location between the corona shield layer and the slot liner.

  By the way, a voltage obtained by superimposing a high-frequency surge voltage generated due to a difference in characteristic impedance of a high-frequency power source, a cable, and the rotating electric machine on a driving voltage having a high-frequency component generally applied from a power source is input to the rotating electric machine. The As a result, an input voltage higher than the drive voltage (up to twice the drive voltage) is applied to the rotating electrical machine.

  Since the conventional rotating electrical machine has a relatively high frequency driving voltage, the input voltage is kept low even when a surge voltage is superimposed. In addition, since the transition time at the rise and fall of the input voltage was relatively gradual, the local charge current density at the partial contact point between the corona shield layer and the slot liner at the core exit was kept low. There was no problem of deterioration or burning of the corona shield layer or slot liner.

  However, in recent years, higher voltage and higher loss of rotating electrical machines have been promoted based on higher withstand voltage and higher speed of switching elements for high frequency power supplies, and excessive high frequency input voltage with surge voltage superimposed. However, as a result of being applied to the rotating electrical machine, the charging current density locally increases at the partial contact point between the corona shield layer and the slot liner due to a rapid voltage change in a short time at the core outlet. However, the corona shield layer and the slot liner are concerned about deterioration and burning.

  The present invention has been made in view of the above-described points, and its object is to provide a high frequency / high voltage in which a surge voltage is superimposed on a drive voltage applied from a power source using a switching element that achieves high breakdown voltage and high speed. Therefore, it is an object of the present invention to provide a rotating electrical machine that can prevent deterioration and burnout of a corona shield layer and a slot liner that extend outside a slot of a stator core by simple means.

  In order to achieve the above object, the rotating electrical machine of the present invention is operated with a voltage having a high frequency component, and a stator coil having a corona shield layer formed on the surface of the main insulating layer is placed in a slot formed in the stator core. In a rotating electrical machine mounted via a slot liner, the local high charging current density associated with the superposition of surge voltage generated between the slot liner and the corona shield layer at the core exit of the stator coil extending outside the slot is reduced. A charging current relaxation means is provided.

  By configuring as described above, even if the slot liner warps or undulates, which causes the charging current density to increase, the charging current between the slot liner and the corona shield layer is relaxed by the charging current mitigation means. In comparison, the local high charging current density can be reduced, and deterioration of the corona shield layer and burnout due to the concentration of charging current can be prevented.

  According to the present invention, even when a high frequency / high voltage in which a surge voltage is superimposed on a drive voltage applied from a power source using a switching element that achieves high breakdown voltage and high speed is input to a rotating electrical machine, By such means, it is possible to obtain a rotating electrical machine that can prevent the corona shield layer and the slot liner extending outside the slots of the stator core from being deteriorated and burned out.

It is a schematic longitudinal cross-sectional view of the core exit part vicinity of the stator coil which shows 1st Embodiment of the rotary electric machine of this invention. FIG. 2 is an enlarged partial perspective view showing an end portion of the slot liner of FIG. 1. It is a characteristic view which shows an example of the relative comparison of the charging current which flows into the partial contact location in 1st Embodiment of the conventional structure and the rotary electric machine of this invention. It is a figure equivalent to FIG. 1 which shows 2nd Embodiment of the rotary electric machine of this invention. It is a figure equivalent to FIG. 1 which shows 3rd Embodiment of the rotary electric machine of this invention. It is a figure equivalent to FIG. 1 which shows 4th Embodiment of the rotary electric machine of this invention. It is a figure equivalent to FIG. 1 which shows 5th Embodiment of the rotary electric machine of this invention. It is a schematic longitudinal cross-sectional view of the core exit part vicinity of the stator coil which shows the conventional rotary electric machine. It is a perspective view which shows the stator of the rotary electric machine operated with the voltage which has a high frequency component.

  A first embodiment of a rotating electrical machine according to the present invention will be described below with reference to FIGS. 1 and 2, and a conventional rotating electrical machine will be described based on differences from the electric motors illustrated in FIGS. 8 and 9. In addition, the same code | symbol of FIG.1, FIG.2, FIG.8, FIG.9 shows the same structural member.

  As shown in FIGS. 8 and 9, the electric motor is schematically configured by a rotor (not shown) and a stator 3 disposed opposite to the outer diameter side of the rotor via a predetermined gap. .

  The rotor usually includes a rotor core supported on a rotating shaft, and a rotor winding attached to the rotor core.

  On the other hand, the stator 3 includes a stator core 5 formed by laminating a plurality of electromagnetic steel sheets in the axial direction, and a plurality of stator cores 5 extending in the axial direction on the inner diameter side of the stator core 5 and having a predetermined interval in the circumferential direction. The formed slot 6, the stator coil 7 mounted in the plurality of slots 6, the stator frame 8 supporting the outer diameter side of the stator core 5, and both axial ends of the stator frame 8 An end plate 2 fixed to the portion and a bearing (not shown) for supporting the rotating shaft on the end plate 2 are roughly constituted.

  The stator coil 7 includes a coil conductor 9 and a main insulating layer 10 formed on the surface of the coil conductor 9, and the stator coil 7 is mounted in the slot 6 of the stator core 5. 7A, and a coil end portion projecting outside the slot 6. The coil end portion is generally composed of a core outlet portion 7B and an involute portion 7C.

  When the linear portion 7A of the stator coil 7 is mounted in the slot 6, an insulating material 11 (see FIG. 2) is interposed between the stator coils 7 adjacent in the vertical direction, and the stator adjacent in the vertical direction. The coils 7 are mounted together in a state covered with a slot liner 12, and a wedge 13 is fitted on the opening side of the slot 6 to firmly support the stator coil 7 in the slot 6.

  The outer periphery of the main insulating layer 10 of the linear portion 7A mounted in the slot 6 of the stator coil 7 is covered with a corona shield layer 14 for the purpose of preventing corona discharge between the stator core 5 and the stator coil 7. Has been. Further, creeping discharge is generated from the core outlet portion 7B of the stator coil 7 to the involute portion 7C due to electric field concentration at the end portion of the corona shield layer 14 projecting outside the slot 6, and thereby the corona shield layer 14 and the main coil portion Since the insulating layer 10 may be deteriorated, the high resistance corona shield layer 15 may be covered in a direction away from the stator core 5 while covering the end of the corona shield layer 14.

  The stator coil 7 configured as described above is connected to the high frequency power supply 16 to drive the electric motor.

  By the way, a voltage obtained by superimposing a high-frequency surge voltage generated due to a difference in characteristic impedance of a high-frequency power source, a cable, and the rotating electrical machine on a drive voltage having a high-frequency component generally applied from a power source is input to the rotating electrical machine. The As a result, an input voltage higher than the drive voltage (up to twice the power supply voltage) is applied to the rotating electrical machine.

  By configuring the stator coil 7 as described above, the main insulating layer 10, the corona shield layer 14, and the slot liner 12 are attached in close contact with each other in the slot 6. 6 can be brought into sufficient contact.

  Therefore, even when the surge voltage is superimposed, the charging current proportional to the time change of the input voltage is distributed over the entire area, so there is no portion where the charging current is concentrated, and the corona shield layer 14 due to the concentration of the charging current. No deterioration or burnout occurs in the linear portion 7A of the stator coil 7.

However, the contact between the corona shield layer 14 of the core outlet portion 7B of the stator coil 7 projecting from the end of the slot 6 of the stator core 5 and the slot liner 12 is caused by warping and undulation of the slot liner 12 due to manufacturing conditions. For this reason, partial contact may occur. As a result, the charging current proportional to the time variation of the input voltage flows in a concentrated manner at the part of the contact point. Therefore, in a rotating electrical machine using a high breakdown voltage / high frequency switching element, the charging current caused by superposition of the high frequency surge voltage There is a concern that the corona shield layer 14 may be deteriorated or burnt out due to the increase in the number of the corona.
Therefore, in the present embodiment, as shown in FIGS. 1 and 2, the corona shield layer 14 at the core outlet portion 7 </ b> B protruding from the end of the slot 6 of the stator core 5 against the warp and undulation of the slot liner 12, A charging current relaxation layer 17 serving as a charging current relaxation means is interposed between the slot liner 12 and the end of the slot liner 12 in the axial direction.

  By interposing the charging current relaxation layer 17 in this way, even when the corona shield layer 14 and the slot liner 12 are in partial contact, the charging current relaxation layer 17 prevents deterioration and burning of the corona shield layer 14 due to the charging current. can do.

  In this embodiment, the thermal expansion of the stator coil 7 during operation of the motor is taken into consideration, so that there is a margin in the vicinity of the end of the slot liner 12, that is, the charging current relaxation layer 17 is arranged in the axial direction of the slot liner 12. It extends from the end and intervenes.

  As the electrical characteristics of the charging current relaxation layer 17, materials ranging from insulating to semiconductive can be applied. However, the volume resistance (resistance in the thickness direction) of the charging current relaxation layer 17 after the charging current relaxation layer 17 is disposed. ) Is preferably higher than the volume resistance of the corona shield layer 14.

  A material having good varnish permeability such as mica tape, glass cloth tape, glass roving, non-woven fabric and the like is suitable for the charging current relaxation layer 17. Alternatively, a semiconductive tape used for the corona shield layer 14 may be used. In this case, the volume resistance of the charging current relaxation layer 17 is brought into contact with the longitudinal cross section of the coil. Thick winding is desirable so that the volume resistance of the corona shield layer 14 at the position is higher.

  When mounting these charging current relaxation layers 17, in the coil manufacturing stage, for example, a semiconductive tape is wound on the main insulating layer 10 to form the corona shield layer 14, and then, it is projected in the axial direction outside the slot 6. What is necessary is just to form the charging current relaxation layer 17 in the part in which the edge part of the slot liner 12 is located.

  That is, in the all-impregnation insulation method, the varnish is filled in the charging current relaxation layer 17 in the entire impregnation step, and a material having a higher volume resistance than the corona shield layer 14 is formed through the curing step after the impregnation, In the resin-rich insulation method, the charging current relaxation layer 17 is disposed on the upper surface of the corona shield layer 14 when the diamond coil or the one-turn half coil is manufactured, and the volume resistance is higher than that of the corona shield layer 14 by mold hardening with varnish. High material is formed. The charging current relaxation layer 17 may be a binding body such as a heat-shrinkable tape or a semiconductive or insulating paint that is thickly coated so as to have a higher volume resistance than the corona shield layer 14.

  By using such a charging current relaxation layer 17, the slot liner 12 is warped and swelled as shown in an example of a relative comparison diagram of the charging current flowing through the partial contact location of the conventional configuration shown in FIG. 3 and the present embodiment. Even when a partial contact occurs, it is understood that the charging current associated with the partial contact between the slot liner 12 and the corona shield layer 14 can be greatly reduced as compared with the prior art. It can be seen that the layer 14 is prevented from deterioration and burnout.

  By the way, in the present embodiment, in particular, the charging current relaxation layer 17 is provided in the vicinity of the end portion of the slot liner 12 projecting outside the slot 6 (core outlet portion 7B) where the warp and undulation of the slot liner 12 may be manifested. However, the charging current relaxation layer 17 may be extended with respect to the entire length of the slot liner 12 projecting out of the slot 6 or the direction away from the slot 6 from the viewpoint of improving reliability.

  In view of ease of manufacturing, the total length of the slot liner 12 and the slot 6 projecting from the inside of the stator core 5 near the end of the slot 6 through the end of the slot 6 to the outside of the slot 6 (core outlet 7B). The charging current relaxation layer 17 may be extended in a direction away from the charging current.

  In addition, in the direction away from the slot 6, the corona shield layer 14 and the high resistance corona shield layer 15 may be extended so as to serve as an exterior material.

  Furthermore, it is desirable to provide the charging current relaxation layer 17 on the outer periphery of the end portion of the slot liner 12 at the core outlet portion 7B of all the stator coils 7, but in particular, the applied voltage and applied voltage of the input waveform to the motor in the inverter control If the voltage change component at the time of voltage rise or fall is not extremely large, it may be applied only to the first one or a plurality of stator coils 7 from the connection with the inverter.

  Next, a second embodiment of the rotating electrical machine according to the present invention will be described based on the core outlet portion of the stator coil of the electric motor shown in FIG. 1, 2, 8, and 9 indicate the same constituent members, and detailed description thereof is omitted.

  In the present embodiment, the difference from the first embodiment is the installation configuration of the charging current relaxation layer. That is, a coating having electrical characteristics equivalent to those of the first embodiment is applied to the surface facing the corona shield layer 14 in the vicinity of the end portion of the slot liner 12 that is likely to be warped and swelled as a charging current relaxation layer. The relaxation layer 18 is formed.

  Specifically, with respect to the slot liner 12 to be used, on the surface facing the corona shield layer 14 outside the slot 6 (core outlet portion 7B), the volume resistance is higher than that of the corona shield layer 14 in advance. A conductive or insulating paint is applied to a desired thickness, and then a slot liner 12 is disposed on the stator core 5 together with the stator coil 7.

  By using such a charging current relaxation layer 18, the charging current between the slot liner 12 and the corona shield layer 14 can be greatly reduced as compared with the conventional case even if the slot liner 12 is warped or undulated. Deterioration and burnout of the corona shield layer 14 due to the concentration of charging current can be prevented.

  In the present embodiment, in particular, the charging current relaxation layer 18 is provided on the surface facing the corona shield layer 14 in the vicinity of the end of the slot liner 12 where there is a risk of warping or waviness of the slot liner 12. However, the charging current relaxation layer 18 may be extended on the entire surface of the slot liner 12 that protrudes outside the slot 6 (core outlet portion 7B) and faces the corona shield layer 14.

  FIG. 5 shows a core outlet portion of a stator coil of an electric motor that is a third embodiment of the rotating electrical machine according to the present invention. Also in the present embodiment, the same reference numerals as those in FIGS. 1, 2, 4, 8, and 9 indicate the same components, and thus detailed description thereof is omitted.

  This embodiment is basically the same as the second embodiment shown in FIG. 4, and the surface of the end of the slot liner 12 facing the corona shield layer 14 outside the slot 6 (core outlet portion 7B). The outermost layer is an insulating layer 19 which is a charging current relaxation means using the base material portion of the slot liner 12.

  Some slot liners 12 are made by conducting a conductive coating on the surface of an insulating material such as a glass cloth tape. In this embodiment, the slot liner 12 utilizes the insulating properties of the insulating material. That is, a portion (insulating layer 19) not provided with a conductive coating having an insulating base material as the outermost layer in advance is provided at the end of the slot liner 12, and the insulating layer 19 is provided outside the slot 6 (core outlet portion 7B). It is used for the surface facing the corona shield layer 14.

  By configuring in this way, it is possible to achieve the same effects as in the above embodiments.

  In the present embodiment, the insulating layer 19 is formed on the surface facing the corona shield layer 14 in the vicinity of the end of the slot liner 12 where there is a possibility that warping or waviness of the slot liner 12 may become apparent. The entire surface facing the corona shield layer 14 of the slot liner 12 outside the slot 6 (core outlet portion 7B) may be used as the insulating layer 19.

  FIG. 6 shows a core outlet portion of a stator coil of an electric motor that is a fourth embodiment of the rotating electrical machine according to the present invention. Also in this embodiment, the same reference numerals as those in FIGS. 1, 2, 4, 5, 8, and 9 indicate the same components, and thus detailed description thereof is omitted.

  This embodiment is basically the same as the third embodiment shown in FIG. 5, and the surface of the end of the slot liner 12 facing the corona shield layer 14 outside the slot 6 (core outlet portion 7B). The charging current relaxation layer 23 is applied to the slot liner 12 as the outermost layer.

  The electrical characteristics of the charging current relaxation layer 23 are preferably equivalent to those of the charging current relaxation layer 17 shown in the first embodiment. Moreover, as a material of the charging current relaxation layer 23, a sheet material made of mica, glass cloth, nonwoven fabric, or the like shown in the first embodiment is suitable.

  When mounting these charging current relaxation layers 23, the charging current relaxation layer 23 may be provided in advance at the end of the slot liner 12 and disposed in the slot 6 together with the stator coil 7 during assembly. Specifically, as the charging current relaxation layer 23, the slot liner 12 and the sheet material that is the charging current relaxation layer 23 may be bonded in advance with a varnish or the like and fixed.

  By configuring in this way, it is possible to achieve the same effects as in the above embodiments.

  In the present embodiment, in particular, the charging current relaxation layer 23 is formed on the surface facing the corona shield layer 14 in the vicinity of the end of the slot liner 12 where there is a risk of warping or waviness of the slot liner 12. However, the entire surface facing the corona shield layer 14 of the slot liner 12 outside the slot 6 (core outlet 7B) may be used as the charging current relaxation layer 23.

In view of ease of manufacturing, the total length of the slot liner 12 and the slot 6 projecting from the inside of the stator core 5 near the end of the slot 6 through the end of the slot 6 to the outside of the slot 6 (core outlet 7B). The charging current relaxation layer 23 may be extended in a direction away from the charging current. )
FIG. 7 shows the vicinity of the core outlet of a stator coil of an electric motor that is a fifth embodiment of the rotating electrical machine according to the present invention. Also in this embodiment, the same reference numerals as those in FIGS. 1, 2, 4, 5, 6, 8, 8 and 9 indicate the same components, and thus detailed description thereof is omitted.

  The present embodiment is basically the same as the first to fourth embodiments, and has a configuration in which the charging current relaxation layer is a multilayer. That is, the second charge formed by the first charge current relaxation layer 20 formed of the insulating layer 19 shown in the third embodiment and the charge current relaxation layer 18 shown in the second embodiment. A laminated charge current relaxation layer 22 is formed by overlapping the current relaxation layer 21.

  By comprising in this way, an effect equivalent to or more than that of each of the above embodiments can be obtained.

  In the present embodiment, in particular, the charging current relaxation layer 22 is formed on the surface facing the corona shield layer 14 centering around the end portion of the slot liner 12 where the warp and undulation of the slot liner 12 may be manifested. However, the charging current relaxation layer 22 may be extended on the entire surface of the slot liner 12 facing the corona shield layer 14 projecting outside the slot 6 (core outlet portion 7B). Furthermore, with respect to the second charging current relaxation layer 21, the relaxation layer may be extended in a direction away from the outside of the slot 6.

  As a modification of the fifth embodiment, the first charging current relaxation layer 20 formed of the insulating layer 19 shown in the third embodiment and the charging current shown in the first embodiment are used. Even if the relaxation layer 17 is overlapped to form a stacked charging current relaxation layer, the same effects as those of the above-described embodiments can be obtained.

  Furthermore, as a modification of the fifth embodiment, the first charging current relaxation layer 20 formed of the charging current relaxation layer 23 shown in the fourth embodiment and the second embodiment are shown. The first charging current relaxation layer 20 formed by the charging current relaxation layer 23 shown in the fourth embodiment, Even when the charge current relaxation layer 17 shown in the first embodiment is overlapped to form a stacked charge current relaxation layer, the same effects as those of the above embodiments can be obtained.

  Each of the above explanations has been given by taking an electric motor as an example of a rotating electric machine, but it is needless to say that the present invention can be applied not only to an electric motor but also to a generator such as a turbine generator or a gas turbine generator.

2 ... end plate, 3 ... stator, 5 ... stator core, 6 ... slot, 7 ... stator coil, 7A ... straight line part, 7B ... core outlet part, 7C ... involute part, 8 ... stator frame, 9 ... Coil conductor, 10 ... main insulating layer, 11 ... insulating material, 12 ... slot liner, 13 ... wedge, 14 ... corona shield layer, 15 ... high resistance corona shield layer, 16 ... high frequency power source, 17, 18 ... charging current relaxation layer , 19 ... insulating layer, 20 ... first charge current relaxation layer, 21 ... second charge current relaxation layer, 22 ... stacked charge current relaxation layer, 23 ... charge current relaxation layer.

Claims (19)

The stator is composed of a rotor and a stator that is arranged opposite to the outer diameter side of the rotor via a predetermined gap, and the stator is configured by laminating a plurality of electromagnetic thin steel plates in the axial direction. An iron core, a plurality of slots extending in the axial direction on the inner diameter side of the stator core and formed with a predetermined interval in the circumferential direction, a stator coil mounted in the plurality of slots, and the stator core 5 A stator frame that supports the outer diameter side,
The stator coil includes a coil conductor, a main insulating layer formed on the surface of the coil conductor, and a corona shield layer provided on the surface of the main insulating layer, and in the slot of the stator core. It is composed of a straight portion mounted via a slot liner provided on the surface of the corona shield layer, and a core outlet portion of the stator coil that extends out of the slot, and operates at a voltage having a high frequency component. In the rotating electric machine
Charge current mitigation means is provided for mitigating local high charge current caused by superposition of surge voltage generated between the slot liner and the corona shield layer at the core exit of the stator coil extending outside the slot. Rotating electric machine characterized by that. In the rotating electrical machine according to claim 1,
The rotating electrical machine is characterized in that the charging current relaxation means comprises a charging current relaxation layer interposed between an axial end of the slot liner and the corona shield layer. The rotating electrical machine according to claim 2,
The rotating electrical machine, wherein the charging current relaxation layer is made of a material having good varnish permeability. In the rotating electrical machine according to claim 3,
The rotating electrical machine characterized in that the material with good permeability of the varnish is any one of mica tape, glass cloth tape, glass roving and non-woven fabric. The rotating electrical machine according to claim 2,
The rotating electrical machine is characterized in that the charging current relaxation layer is extended and installed with respect to a full length of the slot liner protruding outside the slot or a direction away from the slot. In the rotating electrical machine according to claim 1,
The rotating electrical machine according to claim 1, wherein the charging current relaxation means includes a charging current relaxation layer having a coating on a surface facing the corona shield layer in the vicinity of the end portion of the slot liner. In the rotating electrical machine according to claim 6,
The charging current relaxation layer is formed on the surface of the slot liner facing the corona shield layer outside the slot so that the volume resistance in the coil cross-sectional direction is higher than that of the corona shield layer in advance. Is a rotating electric machine characterized by having a desired thickness. The rotating electrical machine according to claim 2,
The charge current relaxation layer is formed by applying a semiconductive or insulating paint by a desired thickness so that the volume resistance in the coil cross-sectional direction is higher than that of the corona shield layer. Electric. In the rotating electrical machine according to claim 1,
The rotating electrical machine according to claim 1, wherein the charging current relaxation means includes an insulating layer having a surface of the surface of the slot liner facing the corona shield layer outside the slot as a base material of the slot liner. The rotating electrical machine according to claim 9,
The slot liner is formed by previously providing a portion not provided with a conductive coating having an insulating base material as an outermost layer, and the portion not provided with the conductive coating is used for a surface facing the corona shield layer outside the slot. A rotating electrical machine characterized in that the insulating layer is used. The rotating electrical machine according to claim 1,
The rotating electrical machine according to claim 1, wherein the charging current relaxation means forms an outermost layer by attaching a sheet material to a surface facing the corona shield layer in the vicinity of the end portion of the slot liner. The rotating electrical machine according to claim 11,
The rotating electrical machine, wherein the sheet material is made of a material having good varnish permeability. The rotating electrical machine according to claim 12,
The rotating electrical machine characterized in that the material having good permeability of the varnish is any one of a mica sheet, a glass cloth sheet, and a nonwoven sheet. In the rotating electrical machine according to claim 1,
The charging current mitigating means includes a first charging current mitigating layer in which a surface facing the corona shield layer outside the slot of the slot liner is formed of an insulating layer which is a base material of the slot liner, and a coating is applied. A rotating electrical machine comprising a laminated charging current relaxation layer in which the second charging current relaxation layer is overlapped. In the rotating electrical machine according to claim 1,
The charging current relaxation means includes a first charging current relaxation layer in which the outermost layer on the surface of the slot liner that faces the corona shield layer outside the slot is formed of an insulating layer that is a base material of the slot liner. The rotating electrical machine further comprises a laminated charging current relaxation layer in which a second charging current relaxation layer is interposed between the axial end of the slot liner and the corona shield layer. In the rotating electrical machine according to claim 1,
The charging current relaxation means is semiconductive so that the surface of the slot liner that faces the corona shield layer outside the slot has a volume resistance in the coil cross-sectional direction higher than that of the corona shield layer on the slot liner in advance. Characterized in that it comprises a laminated charging current relaxation layer in which a first charging current relaxation layer provided with a conductive or insulating sheet material and a second charging current relaxation layer provided with a coating are superposed on each other. Electric. In the rotating electrical machine according to claim 1,
In the charging current relaxation means, the outermost layer of the surface of the slot liner facing the corona shield layer outside the slot has a volume resistance in the coil cross-sectional direction higher than that of the corona shield layer on the slot liner in advance. The first charging current relaxation layer is provided with a semiconductive or insulating sheet material, and a second charging current relaxation layer is provided between the axial end of the slot liner and the corona shield layer. A rotating electrical machine comprising an interposing laminated charging current relaxation layer. The rotating electrical machine according to any one of claims 14 to 17,
The rotating electrical machine characterized in that the laminated charging current relaxation layer is extended and installed on the entire surface of the slot liner facing the corona shield layer that projects out of the slot. The rotating electrical machine according to any one of claims 14 to 17,
The rotating electrical machine, wherein the second charging current relaxation layer is installed so as to extend with respect to a full length of the slot liner protruding outside the slot or a direction away from the slot.

Images