JP5564341B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a structure of a rotating electrical machine suitable for driving an inverter.

  In recent years, from the viewpoint of energy saving, variable speed operation of a rotating electrical machine using an inverter power supply has been actively performed in various fields such as electric power, industry, automobiles, railways, and home appliances.

  However, in rotating electrical machines, various problems such as electric corrosion of bearings, insulation, and EMI / EMC are generated along with inverter driving, and various countermeasure technologies have been developed for these problems.

  For the electric corrosion of bearings that accompanies inverter drive, the rotor can be shielded with a conductive material by electrostatically coupling the inverter common mode voltage from the stator winding (armature winding or excitation winding) to the rotor. There is a method for preventing the electrolytic corrosion of the bearing by reducing the common mode voltage induced in the bearing and reducing the voltage applied between the inner ring and the outer ring of the bearing supporting the rotor.

  However, when a conductive layer is directly provided on the surface of the armature winding or the core, the laminated steel sheets of the core are short-circuited, and an eddy current flows to increase the loss of the rotating machine. Further, in the worst case for a large rotating machine, the core may be dissolved.

  For such a problem, as in Patent Documents 1 and 2, it is effective to install the conductive layer after insulating the core with the mold resin.

JP 2004-297876 A JP 2009-118628 A

  However, in Patent Documents 1 and 2, since the entire core is insulated, if grounding for high frequency is not properly performed, the core has a floating potential. As a result, the conductive layer becomes an electrode, and the stator winding There is a possibility that the common mode voltage is likely to be induced in the rotor.

  Further, since the entire core is covered with the conductive layer, when the high-frequency alternating magnetic flux is linked, a high-frequency eddy current flows through the conductive layer and heat is generated. As a result, the insulating layer below the conductive layer may be burned out.

  Further, in recent years, when the dV / dt of switching of the inverter becomes high, a displacement current of i = C · dV / dt flows through the electrostatic shield part, and the electrostatic shield further generates heat by adding this current, and the lower part of the conductive layer There was a risk of burning out of the insulating layer.

  For the above reasons, it has been difficult for conventional methods to prevent electrolytic corrosion of bearings in recent high-speed, high-frequency inverter-driven rotating machines.

  An object of the present invention is to provide a high-frequency electric field generated from an armature winding or an excitation winding by electrostatic shielding even in a rotating electric machine driven by a high-speed high-frequency inverter, thereby preventing the electric corrosion of the bearing caused by the inverter driving and improving reliability. It is to provide a high-speed inverter-driven rotating electrical machine system.

  The object of the present invention can be realized by the following method. That is, it is a rotating electric machine provided with conductive layers having different conductivity in the vertical direction with respect to the flow of magnetic flux generated from the armature winding or the excitation winding. On the other hand, this is realized by alternately providing conductive material and insulation in the vertical direction. Specifically, the conductive material and insulation are alternately arranged in parallel to the rotation axis direction, the conductive material and insulation are alternately arranged perpendicular to the rotation axis direction, and the conductive material and insulation are arranged in a lattice pattern in the rotation axis direction. Deploy. Further, each of the conductive layers is connected to the core at the axial end of the core containing the armature winding or the excitation winding. The above conductive layer is provided on the surface of the insulating layer provided on the surface of the core containing the armature winding or the excitation winding, or on the surface of the magnetic core whose surface is insulated. The insulating layer is formed by applying an insulating resin to the core surface or attaching an insulating sheet having a conductive material applied to the surface to the core surface. The conductive layer provided on the surface of the insulating layer is formed by applying from a mask engraved with a predetermined pattern, or a predetermined pattern of the conductive material is drawn with a movable nozzle. Or when using an insulating sheet, a conductive material can be previously apply | coated or affixed on the surface of an insulating sheet. In this case, it can be realized by a rotating electric machine in which the pattern of the conductive paint is changed particularly in the slot portion and the coil end portion and the total area of the conductive layer portion is widened in the coil end portion.

  According to the present invention, even in a rotating electric machine driven by a high-speed and high-frequency inverter, a high-frequency electric field generated from an armature winding or an excitation winding is electrostatically shielded to prevent galvanic corrosion of the rotor bearing, and high reliability and high efficiency. A variable-speed inverter-driven rotating electrical machine system can be provided.

It is an axial direction cross-section figure of the rotary electric machine by Example 1 of this invention. It is A-A 'sectional drawing of FIG. It is B-B 'sectional drawing of FIG. It is an axial cross-section figure of the rotary electric machine by Example 2 of this invention. FIG. 5 is a cross-sectional view taken along line A-A ′ of FIG. 4. FIG. 5 is a B-B ′ cross-sectional view of FIG. 4. It is an axial sectional structure figure of the rotary electric machine by Example 3 of this invention. It is A-A 'sectional drawing of FIG. It is B-B 'sectional drawing of FIG. It is an axial cross-section figure of the rotary electric machine by Example 4 of this invention. It is A-A 'view of FIG. It is an axial direction cross-section figure of the rotary electric machine by Example 5 of this invention. It is A-A 'view of FIG. It is an axial direction cross-section figure of the rotary electric machine by Example 6 of this invention. It is A-A 'view of FIG. It is a B-B 'view of FIG. It is an axial direction cross-section figure of the rotary electric machine by Example 7 of this invention. It is A-A 'sectional drawing of FIG. It is an insulating-layer manufacturing process figure by the method of Example 8 of this invention. It is a conductive layer manufacturing process figure by the method of Example 8 of this invention. It is A-A 'sectional drawing of FIG. It is B-B 'sectional drawing of FIG. Insulating sheet film with conductive material coated on the surface Insulating sheet film with conductive material coated in a pattern on the surface Bobbin with conductive material on the surface It is A-A 'sectional drawing of FIG. It is B-B 'sectional drawing of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a rotating electrical machine 1 according to the first embodiment. This rotary electric machine includes a stator core 2 in which an armature winding 7 is housed, a rotor 3 and a rotor shaft 4 that rotate in synchronization with a rotating magnetic flux generated from the armature winding 7, and the rotor shaft 4 is It is mechanically supported by bearings 5 and 6. A three-phase AC voltage is applied to the armature winding 7 from an inverter (not shown), and a rotating magnetic flux is generated by the flowing current.

  On the inner peripheral surface of the stator core 2 facing the rotor 3, the insulating layer 8 is arranged over 360 ° in the circumferential direction. Further, the insulating layers 9 and 10 are also arranged in the circumferential direction over 360 ° in the coil end portion of the coil 7 projecting in the axial direction from the core 2. Conductive layers 11, 12, and 13 are disposed on the surfaces of the insulating layers 8, 9, and 10, respectively. The conductive layers 11, 12, and 13 are connected to the core at the axial end 14.15. The core 2 is grounded via a housing 16 connected to the core outer peripheral surface.

  FIG. 2 is a cross-sectional view taken along the line A-A ′ in which the central portion of the core 2 of FIG.

  In the first embodiment, among the inner periphery of the stator core 2, a plurality of (three in the figure) conductive layers 11 are provided in the slot opening in the direction perpendicular to the flow of the magnetic flux 18. By doing in this way, the high frequency common mode voltage which leaks from the slot opening part and is induced | guided | derived to the rotor 3 can be shielded. These are many elongated in the axial direction (18 in the figure) while being spaced apart in the circumferential direction so that the conductive material and the insulating layer (here, air) are alternately arranged in the circumferential direction of the inner circumferential surface. ) Conductive layer 11 is disposed. Thereby, on the inner peripheral surface of the stator core 2, the conductive layer has no spread in the direction perpendicular to the magnetic flux generated by the armature winding 7 or the magnetic flux generated from the rotor (circumferential direction) By alternately disposing conductive layers and insulating layers, generation of eddy currents due to magnetic flux generated by the armature winding 7 or magnetic flux generated from the rotor is prevented. Furthermore, by reducing the capacitance between the conductive layer and the armature winding and suppressing the amount of displacement current flowing through the conductive layer and flowing into the ground portions 14 and 15, the amount of heat generated in the conductive layer near the ground portion can be reduced. Can be reduced. In the slot opening, when the width of the conductive layer is 2 mm or less, the eddy current and the displacement current (i = Cdv / dt) can be reduced, and heat generation of the conductive layer can be prevented. On the other hand, unless the width of the conductive layer in the circumferential direction is 0.5 mm or more, the shielding effect of the high frequency common mode voltage is lowered. Therefore, in the present invention, by setting the width of the conductive layer in the slot opening to 0.5 to 2 mm, it is possible to effectively suppress eddy currents and displacement currents and shield high frequency common mode voltages. Note that the eddy current can be sufficiently insulated if the width of the insulating layer disposed between the conductive layers is 0.1 mm or more.

  FIG. 3 is a cross-sectional view taken along the line B-B ′ in which the coil end portion of FIG. 1 is cut in a direction perpendicular to the axis. In the first embodiment, on the inner peripheral surface of the coil end portion of the stator, a large number (in the drawing) are elongated in the axial direction while being spaced apart so as to be perpendicular to the flow of the magnetic flux 18 uniformly in the circumferential direction. 42) conductive layers 13 are arranged in a striped pattern. By doing in this way, the high frequency common mode voltage which leaks from a coil end part and is induced | guided | derived to the rotor 3 can be shielded. Further, the conductive layer and the insulating layer are alternately arranged in the circumferential direction of the coil end inner peripheral surface, and the coil end leakage magnetic flux or the rotation formed by the armature winding 7 is alternately arranged. Generation of eddy current due to magnetic flux generated from the child is prevented. Furthermore, by reducing the capacitance between the conductive layer and the armature winding and suppressing the amount of displacement current flowing through the conductive layer and flowing into the ground portions 14 and 15, the amount of heat generated in the conductive layer near the ground portion can be reduced. Can be reduced.

  In the drawing, the width of the conductive layer in the coil end portion is the same as the width of the conductive layer in the slot portion. However, the coil end portion has a smaller amount of magnetic flux and electric flux than the slot portion. Increasing the layer width is also effective. Specifically, in the range from 0.5 mm to approximately the width of the stator teeth 17, eddy current and displacement current can be suppressed and high-frequency common mode voltage can be effectively shielded. Note that the eddy current can be sufficiently insulated if the width of the insulating layer disposed between the conductive layers is 0.1 mm or more. However, since the shielding effect is reduced at 1 mm or more, it is desirable that the thickness be in the range of 0.1 to 1 mm in the present invention.

  FIG. 4 is an axial sectional view of the rotating electrical machine according to the second embodiment of the present invention.

  The rotating electrical machine according to the second embodiment includes a stator core 402 in which an armature winding 407 is housed, a rotor 403 that rotates in synchronization with a rotating magnetic flux generated from the armature winding 407, and a rotor shaft 404. The rotor shaft 404 is mechanically supported by bearings 405 and 406. A three-phase AC voltage is applied to the armature winding 407 from an inverter (not shown), and a rotating magnetic flux is created by the flowing current.

  On the inner peripheral surface of the stator core 402 in which the armature winding is accommodated, an insulating layer 408 is disposed over 360 ° in the circumferential direction. Insulating layers 409 and 410 are also arranged at 360 ° in the circumferential direction at the coil end portion of the coil 407 projecting in the axial direction from the core 402. Conductive layers 411, 412, and 413 are disposed on the surfaces of the insulating layers 408, 409, and 410, respectively.

  These conductive layers 411, 412, and 413 are all thin ring-shaped continuous over 360 ° in the circumferential direction, and a large number (in the figure, 11 rings) of ring-shaped conductive layers are spaced apart in the axial direction. 411, 412 and 413 are arranged. The conductive layers 411, 412, and 413 are connected to the core at axial end portions 414.415. The core 402 is grounded via a housing 416 connected to the core outer peripheral surface.

  Thus, in Example 2, the high frequency common mode voltage induced from the armature winding 407 to the rotor 403 can be shielded. In addition, the conductive layer and the insulating layer are alternately arranged in the direction (axial direction) perpendicular to the magnetic flux generated by the armature winding 407 or the magnetic flux generated from the rotor without extending the conductive layer. Therefore, the generation of eddy currents due to the magnetic flux generated by the armature winding 407 or the magnetic flux generated from the rotor can be prevented. Furthermore, by reducing the capacitance between the conductive layer and the armature winding and suppressing the amount of displacement current flowing through the conductive layer and flowing into the ground portions 14 and 15, the amount of heat generated in the conductive layer near the ground portion can be reduced. Can be reduced.

  FIG. 5 is a cross-sectional view taken along the line A-A ′ in which the central portion of the core 402 in FIG. 4 is cut in a direction perpendicular to the axis.

  The ring-shaped conductive layer 411 is disposed on the inner peripheral surface of the stator core 402 in the circumferential direction 360 °. However, as shown in FIG. 4, the conductive layer 411 does not expand in the axial direction (here, insulated by air), and prevents the generation of eddy currents.

  However, on the other hand, there arises a problem that conduction with the core cannot be obtained. Therefore, in the second embodiment, a plurality of (six in the figure) short-circuit wires 501 that are elongated in the axial direction are provided to connect the five conductive layers 411 that are independent in the axial direction, and between the core 402 and the core shaft. Electrical connection is made at the direction end 414.415.

  FIG. 6 is a cross-sectional view taken along the line B-B ′ of the coil end portion of FIG. 4 taken in the direction perpendicular to the axis.

  Also in the coil end portion, the conductive layers 412 and 413 are ring-shaped connected to each other by 360 ° in the circumferential direction, and as shown in FIG. 4, these conductive layers 412 and 413 also do not expand in the axial direction (here Insulating with air) prevents the generation of eddy currents. Further, similarly to the core part, there arises a problem that conduction with the core cannot be obtained. For this reason, in the second embodiment, the short-circuit line 601 is provided in the axial direction, and the conductive layers 412 and 413 that are independent in the axial direction are connected to each other, and the core 402 is electrically connected at the axial end portion 414.415 of the core. doing.

  FIG. 7 shows a rotating electrical machine 701 according to the third embodiment. This rotating electric machine includes a stator core 702 in which an armature winding 707 is housed, a rotor 703 that rotates in synchronization with a rotating magnetic flux generated from the armature winding 707, and a rotor shaft 704. It is mechanically supported by bearings 705 and 706. Note that a three-phase AC voltage is applied to the armature winding 707 from an inverter (not shown), and a rotating magnetic flux is created by the flowing current. An insulating layer 708 is provided at 360 ° in the circumferential direction on the inner peripheral surface of the stator core 702 facing the rotor and the stator core 702 containing the armature winding. Insulating layers 709 and 710 are also provided in the circumferential direction at 360 ° in the coil end portion of the coil 707 protruding in the axial direction from the core. Conductive layers 711, 712, and 713 are disposed on the surfaces of the insulating layers 708, 709, and 710, respectively, so that the conductive material and the insulation (here, air) are alternately arranged in the axial direction.

  These conductive layers 711, 712, and 713 are all thin ring-shaped continuous over 360 ° in the circumferential direction, and a large number (in the figure, 11 rings) of ring-shaped conductive layers are spaced apart in the axial direction. 711, 712, 713 are arranged. The conductive layers 711, 712, 713 are connected to the core at axial ends 714, 715. The core 702 is grounded via a housing 716 connected to the outer peripheral surface of the core.

  By doing in this way, the high frequency common mode voltage induced | guided | derived to the rotor 703 from the armature winding 707 can be shielded. In addition, the conductive layer is not spread in the direction perpendicular to the magnetic flux generated by the armature winding 707 or the magnetic flux generated from the rotor (axial direction and circumferential direction), and the armature winding 7 is used. The generation of eddy currents due to the magnetic flux generated from the rotor or the magnetic flux generated from the rotor is prevented. Furthermore, by reducing the capacitance between the conductive layer and the armature winding and suppressing the amount of displacement current flowing through the conductive layer and into the ground portions 714 and 715, the amount of heat generated in the conductive layer near the ground portion can be reduced. Can be reduced.

  By the way, in Example 3, insulating layers 7080, 7090, and 7100 are further arranged on the surfaces of the conductive layers 711, 712, and 713, and the conductive layers 7110, 7120, and 7130 are arranged on the surface in the circumferential direction of the inner peripheral surface. The conductive material and the insulating layer (here, air) are alternately arranged in a lattice pattern. In this way, by making the conductive layers doubly independent in the radial direction into a lattice shape, the high-frequency common mode voltage induced from the armature winding 707 to the rotor 703 can be shielded more efficiently.

  FIG. 8 is a cross-sectional view taken along the line A-A ′ of the core portion of FIG. 7. The conductive layers 711 are connected to each other by a short-circuit line 801 in the axial direction. On the other hand, in the conductive layer 7110 on the inner peripheral side, a conductive material and insulation (here, air) are alternately arranged in the circumferential direction. For this reason, even in the conductive layer 7110, the conductive layer does not spread in the direction (axial direction and circumferential direction) perpendicular to the magnetic flux generated by the armature winding 707 or the magnetic flux generated from the rotor. And insulating layers are alternately arranged to prevent generation of eddy current due to magnetic flux generated by the armature winding 707 or magnetic flux generated from the rotor. In addition, the capacitance between the conductive layer and the armature winding is reduced, and the amount of displacement current flowing through the conductive layer and flowing into the ground portions 714 and 715 is suppressed, thereby reducing the heat generation amount of the conductive layer near the ground portion. Reduced.

  FIG. 9 shows a B-B ′ cross-sectional view of the core portion of FIG. 7. The conductive layers 713 are connected to each other by a short-circuit line 901 in the axial direction. On the other hand, in the conductive layer 7130 on the inner peripheral side, a conductive material and insulation (here, air) are alternately arranged in the circumferential direction. For this reason, the conductive layer 7130 also prevents the generation of eddy currents due to the magnetic flux generated by the armature winding 707 or the magnetic flux generated from the rotor.

  FIG. 10 shows a rotating electrical machine 1001 according to the fourth embodiment. In Examples 1-3, it was the conductive layer pattern of the radial gap type rotary electric machine. However, an axial gap type rotating electrical machine also has a problem of bearing corrosion due to the inverter drive, so a countermeasure is necessary. The rotating electric machine according to the fourth embodiment includes a stator core 1002 in which an armature winding 1007 is housed, a rotor 1003 that rotates in synchronization with a rotating magnetic flux generated from the armature winding 1007, and a rotor shaft 1004. The shaft 1004 is mechanically supported by bearings 1005 and 1006. A three-phase AC voltage is applied to the armature winding 107 from an inverter (not shown), and a rotating magnetic flux is generated by the flowing current. An insulating layer 1008 is provided on the entire surface of the stator core 1002 where the rotor faces the stator core 1002 containing the armature winding. A conductive layer 1011 is disposed on the surface of the insulating layer 1008.

  FIG. 11 shows a pattern of the conductive layer 1011 of Example 4. In Example 4, 32 conductive layers 1011 are arranged radially. In the conductive layer 1011, conductive material and insulation (here, air) are alternately arranged in the circumferential direction, so that generation of eddy current can be prevented. The conductive layer is connected to the core on the inner diameter side and the outer diameter side.

  FIG. 12 shows a rotating electrical machine 1201 according to the fifth embodiment. The rotating electric machine according to the fifth embodiment includes a stator core 1202 in which an armature winding 1207 is housed, a rotor 1203 that rotates in synchronization with a rotating magnetic flux generated from the armature winding 1207, and a rotor shaft 1204. The shaft 1204 is mechanically supported by bearings 1205 and 1206. Note that a three-phase AC voltage is applied to the armature winding 1207 from an inverter (not shown), and a rotating magnetic flux is created by the flowing current. An insulating layer 1208 is provided on the entire surface of the stator core 1202 facing the rotor and the stator core 1202 containing the armature winding. A conductive layer 1211 is disposed on the surface of the insulating layer 1208.

  FIG. 12 shows a pattern of the conductive layer 1211 of Example 5. In Example 5, the conductive layers are arranged concentrically. Since the conductive layer and the insulating material (here, air) are alternately arranged in the radial direction in the conductive layer, generation of eddy current can be prevented. In Example 5 in which conductive materials are arranged concentrically, at least one short-circuit wire 1212 is provided for connection with the core, and the conductive layer from the inner diameter side to the outer diameter side is connected to the core.

  FIG. 14 illustrates a rotating electrical machine 1401 according to the sixth embodiment. The rotating electric machine according to the sixth embodiment includes a stator core 1402 in which an armature winding 1407 is housed, a rotor 1403 that rotates in synchronization with a rotating magnetic flux generated from the armature winding 1407, and a rotor shaft 1404. The shaft 1404 is mechanically supported by bearings 1405 and 1406. A three-phase AC voltage is applied to the armature winding 1407 from an inverter (not shown), and a rotating magnetic flux is generated by the flowing current. An insulating layer 1408 is provided on the entire surface of the stator core 1402 in which the armature winding is housed and the stator core 1402 where the rotor faces. A conductive layer 1411 is disposed on the surface of the insulating layer 1408. Further, an insulating layer 14080 is disposed on the surface of the conductive layer 1411, and a conductive layer 14110 is disposed thereon.

  FIG. 15 shows an A-A ′ view of FIG. In Example 6, the conductive layers 14110 are alternately arranged in the circumferential direction. For this reason, generation | occurrence | production of an eddy current can be prevented. FIG. 16 shows a BB ′ view of FIG. The conductive layers 1411 below the insulating layers 1408 are alternately arranged in the radial direction. For this reason, it is possible to prevent the magnetic flux generated by the armature winding 1407 or the magnetic flux eddy current generated from the rotor 1403 from being generated. In Example 6, the core is connected to the conductive layer on the outer diameter side. In addition, the conductive layers 1411 are connected to each other by a short-circuit wire 1412 and are connected to the core with a sum of outer diameters.

  FIG. 17 shows a rotating electrical machine 1701 according to the seventh embodiment. The rotating electric machine according to the seventh embodiment includes a stator core 1702 in which an armature winding 1707 is housed, a rotor 1703 that rotates in synchronization with a rotating magnetic flux generated from the armature winding 1707, and a rotor shaft 1704. The shaft 1704 is mechanically supported by bearings 1705 and 1706. A three-phase AC voltage is applied to the armature winding 1707 from an inverter (not shown), and a rotating magnetic flux is generated by the flowing current. The stator core 1702 in which the armature winding is housed is manufactured by compression-molding soft magnetic powder whose surface is insulated. For this reason, unlike the core using a silicon steel plate like Examples 1-6, the conductive layer 1711 can be arrange | positioned directly on the surface, without providing an insulating layer in the core surface.

  FIG. 18 shows a pattern of the conductive layer 1711 of Example 7. In Example 7, the conductive layer has the conductive material and the insulation (here, air) alternately arranged in the circumferential direction. For this reason, generation | occurrence | production of the eddy current by the magnetic flux made from the armature winding 1707 or the magnetic flux emitted from the rotor 1703 is prevented.

  In Example 8, an example of a method for manufacturing the insulating layer and the conductive layer of the rotating electrical machine of Example 1 will be described. FIG. 19 shows an example of an insulating layer manufacturing process. In the eighth embodiment, an insulating resin is applied to the core surface and the coil end surface of the armature coil 7 from the inner diameter side of the stator core 2 in which the armature coil 7 is stored by the movable nozzle 1901. As a result, the insulating layers 8, 9, and 10 can be manufactured.

  FIG. 20 shows an example of the manufacturing process of the conductive layer. FIGS. 21 and 22 respectively show the A-A ′ section and the B-B ′ section in FIG. 20 in the manufacturing process. In Example 8, a conductive material such as a resin containing a nonmagnetic metal powder such as silver, aluminum, or copper, or a conductive polymer is applied on the mask 2002 having a pattern cut by a movable nozzle 2001. As a result, the conductive layers 11 and 13 can be manufactured.

In Example 8 above, the insulating resin and the conductive material are applied to the coil surface. However, as shown in FIG. 23, is the insulation sheet film 2302 coated with the conductive material 2301 applied to the core surface in a predetermined pattern? Alternatively, as shown in FIG. 24, the insulating layer and the conductive layer of the rotating electrical machine of Example 1 can also be manufactured by pasting an insulating sheet film 2402 coated with a conductive material 2401 in a pattern on the core surface.

  Alternatively, in the concentrated winding rotary electric machine, a conductive material can be disposed on the surface of the insulating bobbin.

  FIG. 25 shows a side view of the insulating bobbin. 26 and 27 show A-A 'and B-B' cross sections of the bobbin of FIG. By attaching conductive materials 2502 and 2503 on the inner diameter side of the insulating bobbin 2501 to the slot portion and the coil end portion before winding the armature winding, the conductive paint adheres to the surface of the armature winding. Can be prevented.

  According to the present invention, even in a rotating electric machine driven by a high-speed and high-frequency inverter, a high-frequency electric field generated from an armature winding or an excitation winding is electrostatically shielded to prevent galvanic corrosion of the rotor bearing and to provide a high reliability. An efficient variable speed inverter-driven rotating electrical machine system can be provided.

  DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 2 ... Stator core, 3 ... Rotor, 4 ... Rotor shaft, 5, 6 ... Bearing, 7 ... Armature winding, 8, 9, 10 ... Insulating layer, 11, 12, 13 ... Conductive layer, 14.15 ... axial end, 16 ... housing, 17 ... teeth, 18 ... magnetic flux.

Claims (4)

An insulating layer is arranged only on the face of the stator core part in which the stator winding is embedded and / or the coil end part facing the rotor,
On the surface of the insulating layer, conductive layers and insulating portions are alternately formed in a direction perpendicular to the magnetic flux flow of the stator core ,
On the surface of the stator core portion and / or the coil end portion in which the stator winding is embedded facing the rotor, the conductive layers and the insulating portions are alternately formed in the circumferential direction,
The rotating electrical machine wherein the alternating arrangement of the conductive layer and the insulating portion is formed on a plane perpendicular to the rotation axis direction . An insulating layer is arranged only on the face of the stator core part in which the stator winding is embedded and / or the coil end part facing the rotor,
On the surface of the insulating layer, a plurality of elongated conductive layers are arranged at intervals in a direction perpendicular to the magnetic flux flow of the stator core ,
On the surface of the stator core portion and / or the coil end portion in which the stator winding is embedded facing the rotor, the conductive layers and the insulating portions are alternately formed in the circumferential direction,
The rotating electrical machine wherein the alternating arrangement of the conductive layer and the insulating portion is formed on a plane perpendicular to the rotation axis direction . The rotating electrical machine according to claim 1, wherein the conductive layer is electrically connected to the stator core. 4. The rotating electrical machine according to claim 1, wherein a total area of the conductive layer of the coil end portion is formed wider than a total area of the conductive layer of the stator core portion.

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