JP2012095488A - Rotor for rotary electric machine and rotary electric machine using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the usage of insulation paper and suppress partial discharge, etc. between a conducting wire and a core in a slot.SOLUTION: In a stator coil 30 of a stator 12, a conducting wire part of which conducting wire distance from an input terminal is relatively short is included nearer the outer side of the radial direction side and a conducting wire part of which the conducting wire distance from the input terminal is relatively long is included nearer the inner side of the radial direction, of a conducting wire 36 of a plurality of stator coils arranged in the radial direction in one slot S. In addition, an insulation paper lacking part 56 is provided in which insulation paper 50 intervenes between the conducting wire 36 nearer the outer side of the radial direction and slot inner wall surfaces 24, 26, and 28, and the insulation paper 50 does not intervene between the conducting wire 36 nearer the inner side of the radial direction and the slot inner wall surface 26 and 28.

Description

  The present invention relates to a stator of a rotating electrical machine, and more particularly to a stator of a rotating electrical machine in which a coil is inserted and wound in a slot of a stator core.

  2. Description of the Related Art Conventionally, a rotating electrical machine such as an electric motor or a generator including a stator in which a multi-phase stator coil is wound around an inner peripheral portion of a stator core that is a cylindrical iron core is known. For example, in a three-phase synchronous rotating electric machine, U-phase, V-phase, and W-phase stator coils are wound around a stator.

  The stator core has a plurality of teeth projecting radially inward at predetermined intervals in the inner circumferential portion thereof, and opens between the teeth adjacent in the circumferential direction on both the radially inner side and the axially both sides. A slot is formed. The stator coil of each phase is configured by inserting a conducting wire into a slot of the stator core and winding it around the teeth, and one end is connected to an input point that is a connection point of the power supply lead wire The other end is connected to a neutral point which is a connection point with the other-phase stator coil.

  The conducting wire constituting the stator coil is usually covered with an insulating film. However, when high voltage power is applied to the stator coil, dielectric breakdown or part between the conducting wire portion inserted in the slot and the inner wall surface of the slot. Discharge may occur. In order to avoid such a situation, for example, as described in Japanese Patent Application Laid-Open No. 2004-236457 (Patent Document 1), an insulating paper is interposed between the coil in the slot and the inner wall surface of the slot, thereby insulating resistance. Has been done to increase.

JP 2004-236457 A

  As described above, when an input voltage is applied from one end portion of the stator coil formed of the conductive wire wound around the inner peripheral portion of the stator core, the shared voltage applied to one winding has a relatively short line distance from the input point. It is known that the value is higher at the part and lower as it is closer to the neutral point on the output side. Therefore, by devising how to wind the stator coil, there is a possibility that partial discharge with the stator core can be suppressed without interposing insulating paper.

  The objective of this invention is providing the stator of the rotary electric machine which can suppress the partial discharge between the stator coil arrange | positioned in a slot and a stator core, reducing the use of a thin insulating material.

The stator of the rotating electrical machine according to the present invention includes a stator core in which a plurality of teeth protrude in the circumferential direction along an inner peripheral portion and a slot is formed between adjacent teeth, and the teeth inserted into the slot are inserted into the teeth. A stator coil of a rotating electrical machine comprising a stator coil wound around
The stator coil is configured to be wound around the stator core while radially shifting a conductive wire covered with an insulating film, one end is connected to the input point, and the other end is connected to the output point.
Within one slot, among the conductors of the stator coil that are arranged side by side in the radial direction, a conductor portion having a relatively short line distance from the input point is included on the radially outer side, closer to the radially inner side. Includes a conductor portion having a relatively long line distance from the input point,
Within the one slot, a thin insulating material is interposed between the lead wire on the radially outer side and the inner wall surface of the slot, while the insulating material is interposed between the lead wire on the radially inner side and the inner wall surface of the slot. In this configuration, an insulating material lacking portion that is not interposed is provided.

  In the stator of the rotating electrical machine according to the present invention, the insulating film of the conductive wire corresponding to the insulating material lacking portion may be formed of a material having a lower dielectric constant than the insulating film of the conductive wire closer to the outer side in the radial direction.

  Moreover, in the stator of the rotating electrical machine according to the present invention, the insulating film of the conductor corresponding to the insulating material lacking portion may be formed thicker than the insulating film of the conductor portion on the radially outer side.

  A rotating electrical machine according to the present invention includes the stator having any one of the above-described configurations and a rotor provided rotatably in the stator.

  According to the stator of the rotating electrical machine according to the present invention, the insulating material is provided between the inner wall surface of the slot near the radial outer side of the slot including the conductive wire portion having a relatively short line distance from the input point and the conductive wire. Since the insulating material lacking portion is provided on the radially inner side including the conductive wire portion where the wire distance from the point is relatively long, the amount of thin insulating material is reduced between the coil and the stator core in the slot. Insulation breakdown and partial discharge can be suppressed.

It is a figure which shows the axial direction end surface of the stator for rotary electric machines which is embodiment of this invention. It is a figure which shows the connection of a stator coil typically. It is sectional drawing of the square conducting wire which comprises a stator coil. It is a figure which shows an example of how to wind the stator coil with respect to a stator core. It is a figure which shows another example of the winding method of the stator coil with respect to a stator core. It is sectional drawing which shows the arrangement | positioning state of the coil conducting wire and insulation paper which were inserted in one slot. It is a figure similar to FIG. 6 which shows a mode that the radial direction inner side edge part of the insulating paper is mounted | worn in the state in which it is uneven. It is a figure similar to FIG. 6 which shows that the insulating film of the some conducting wire arrange | positioned at radial direction outer side is formed with the low dielectric constant material. It is a figure similar to FIG. 6 which shows a mode that the insulating film of the some conducting wire arrange | positioned at radial direction outer side is formed comparatively thickly.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like.

  In this description, the direction along the central axis of the cylindrical stator is referred to as the axial direction, the direction orthogonal to the central axis is referred to as the radial direction, and is drawn on an orthogonal plane centering on a point on the central axis. The direction along the circumference of the circle is called the circumferential direction.

  In the present embodiment, the rotary electric machine is described as a three-phase AC motor. However, the present invention is not limited to this, and the present invention may be applied to other AC motors such as a single-phase or two-phase motor. And it may be applied to a DC motor, or may be applied to a generator.

  FIG. 1 shows an axial end surface of the motor 10 of the present embodiment. In FIG. 1, only the U-phase stator coil is shown among the three-phase (U-phase, V-phase, W-phase) stator coils for simplification and easy understanding. FIG. 2 schematically shows a three-phase stator coil in a developed state. Further, FIG. 3 is a cross-sectional view of a rectangular conducting wire constituting the stator coil.

  The motor 10 includes a cylindrical stator 12 and a rotor 14 provided in the stator 12. In the rotor 14, a plurality of permanent magnets 18 are embedded in the circumferential direction in the vicinity of the outer peripheral surface of a cylindrical rotor core 16, and both end portions of a rotor shaft 20 fixed through the center are shown. It is supported so that it can rotate on the motor case.

  The stator 12 includes a stator core 22 and a stator coil 30. The stator core 22 has a cylindrical iron core, and can be formed by laminating a number of electromagnetic steel plates punched into an annular shape in the axial direction. However, the stator core 22 may be configured by a powder magnetic core made by pressure-molding a magnetic powder material. In this case, a plurality of divided cores each formed as a powder magnetic core are arranged and connected in an annular shape. Also good.

  A plurality of slots S are formed in the inner peripheral portion of the stator core 22. The slot S is a groove that opens in a substantially rectangular shape on both sides in the axial direction of the stator core 22 and opens in an elongated rectangular shape over the entire axial length of the stator core 22. That is, the slot S is defined by inner wall surfaces (hereinafter referred to as “circumferential inner wall surfaces”) on both sides in the circumferential direction and inner wall surfaces (hereinafter referred to as “radial inner wall surfaces”) on the radially outer side.

  In the present embodiment, for example, eight slots S are formed in a uniform arrangement in the circumferential direction. Here, in order to make it easy to refer to a specific slot, the first slot S1 to the eighth slot S8 are shown in the clockwise order in FIG.

  Teeth T are formed between the slots S adjacent in the circumferential direction. The same number of teeth T as slots S, that is, eight teeth T are formed in this embodiment. Each tooth T has a shape protruding in a substantially trapezoidal shape toward the inside in the radial direction. In the present embodiment, as in the case of the slot S, the first tooth T1 to the eighth tooth T8 are shown in the clockwise order in FIG.

  In FIG. 1, each tooth is shown wide in the circumferential direction. However, in actuality, a slot in which the V-phase and W-phase stator coils are arranged is formed, and therefore, between the circumferential widths of one tooth. A plurality of teeth are formed.

  As schematically shown in FIG. 2, stator coil 30 includes a U-phase coil, a V-phase coil, and a W-phase coil. One end of each phase coil is electrically connected to an input terminal 32 (32U, 32V, 32W) to which power is input via a power line (not shown), and the other end of each phase coil is a neutral point (output). At point 34, they are electrically connected to each other. Since the respective phase coils are configured in the same manner, the stator coil 30 will be described below using the U-phase coil as an example.

  In the present embodiment, the stator coil 30 is formed by bending one conductive wire 36 into a crank shape in which peak portions and valley portions are alternately repeated. That is, the conductive wire 36 constituting each phase coil does not go to the next tooth T after being wound around the teeth T, but enters from the opening on one side in the axial direction of one slot S. The conducting wire 36 coming out from the opening on the other side in the direction is formed so as to go to another slot S immediately. A specific example of how to wind the stator coil 30 will be described later.

  In the present embodiment, the other end of the stator coil 30 is described as being connected to a neutral point. However, in another motor, the other end of the stator coil is connected to a ground wire connection point (output point). Also good.

  The stator coil 30 is formed by a rectangular conducting wire 36 as shown in FIG. The conducting wire 36 is covered with a resin insulating film 40 around a copper wire 38 having a square cross section. In FIG. 3, the width w and height h of the conducting wire 36 and the thickness t of the insulating film 40 are shown. Here, although the conducting wire 36 is shown as a rectangular cross section, a conducting wire having another cross-sectional shape such as a substantially square cross section may be used.

  Referring again to FIG. 1, the stator coil 30 is wound around the teeth T of the stator core 22 while shifting the radial position of the conducting wire 36 in the slot S. In FIG. 1, an example is shown in which a conducting wire 36 that is bent in a crank shape that constitutes the stator coil 30 is wound while being displaced inward in the radial direction. Here, in FIG. 1, when the portion connected to the input terminal 32 is the start of winding of the conducting wire 36, the state where the conducting wire 36 advances from the near side to the far side in the slot is indicated by a black dot circle, and the back side of the stator core 22 The state of proceeding from the front side to the front side is indicated by an X circle. In addition, the solid line portion of the conductive wire 36 indicates a portion passing through the teeth to the next slot on the axial end surface on the near side (front side of the paper surface) of the stator core 22, and the dotted line portion of the conductive wire 36 is the back side of the stator core 22. A portion of the end surface in the axial direction (the back side of the paper surface) passing over the teeth and passing to the next slot is shown.

  In the example shown in FIG. 1, the conducting wire 36 extending from the input terminal 32 first enters the first slot S1 and proceeds to the back side, and then proceeds to the front side in the next second slot S2 on the back side of the stator core 22. At this time, the conducting wire 36 is inserted and arranged on the outermost peripheral side in the slots S1 and S2.

  Next, when the conducting wire 36 crosses from the second slot S2 to the third slot S36, the lead wire 36 moves slightly inward in the radial direction and enters the next third slot S3. In the same manner, the conductive wire 36 extends to the next fourth slot S4 on the back side of the stator core 22, and passes through the same radial position in the fourth slot S4 as in the third slot S3. Come out.

  Subsequently, in the same manner, the conducting wire 36 proceeds from the fifth slot S5 to the eighth slot S8 and exits from the eighth slot S8 to the near side. Then, the conducting wire 36 enters the first slot S1, which is the same position as the inner periphery in the radial direction when exiting the eighth slot S8, and the stator core 22 is rotated once in the clockwise direction. In this way, the stator coil 30 is wound around the inner peripheral portion of the stator core 22 while shifting radially inward. An example of how to wind the second and subsequent rounds will be described next with reference to FIGS.

  FIG. 4 is a diagram illustrating an example of how to wind the stator coil around the stator core 22. In FIG. 4, the upper diagram shows how the crank-shaped conductor 36 is inserted into each of the slots S1 to S8, and the solid line is a portion in which the inner circumference of the stator core 22 is wound in the clockwise direction as in FIG. On the contrary, the alternate long and short dash line is a portion wound around the inner periphery of the stator core 22 in the counterclockwise direction.

  4 shows a state in which six conductors 36 are inserted into the slots S1 to S8 and arranged side by side in the radial direction, the upper side being the outer peripheral side in the slot, and the lower side being the lower side. It is the inner circumference side in the slot. Here, similarly, the solid rectangle and the dashed-dotted rectangle indicate the direction of the conductor 36 that is wound around and arranged, and the numbers given in the rectangle of the conductor 36 indicate the winding order. . In other words, the larger the number, the longer the conductor distance from the input terminal 32, and the lower the shared voltage applied to that portion.

  In addition, since the conducting wire 36 is wound more than one turn in both the clockwise direction and the counterclockwise direction, two conducting wires 36 such as Nos. 8, 9 adjacent to each other in the eighth slot S8, Two conductors 36 such as Nos. 16 and 17 adjacent in one slot S1 are not immediately inserted into the slot immediately, but in terms of the order of conductor parts having a long conductor distance from the input terminal 32, For convenience, serial numbers are used for convenience.

  In the example shown in FIG. 4, first, the conducting wire 36 started to be wound from the input terminal 32 is sequentially inserted into the slots S1 to S8 in the clockwise direction (that is, from the left side to the right side in the following diagram, and also in FIG. 5). It is arranged at the position closest to the outer periphery in the direction. Next, when the lead wire 36 is wound in the counterclockwise direction (that is, from the right side to the left side in the following diagram, the same applies to FIG. 5), the lead wire 36 is sequentially inserted from the eighth slot S8 to the first slot S1, and 2 in each slot. It is arranged at a position radially outward. Similarly, six conducting wires 36 are inserted and arranged in each of the slots S1 to S8 while the winding direction of the conducting wire 36 is alternately reversed in the clockwise direction and the counterclockwise direction. At this time, the six conducting wires 36 inserted into one slot are arranged in contact with each other substantially or completely. The lead wire portion No. 48, which is the lead wire portion finally inserted into the first slot S1, is connected to the neutral point 34, and the winding of the stator coil (that is, the U-phase coil) is completed.

  As is clear from FIG. 4, in this example, the conducting wire 36 is sequentially inserted into one slot from the outside in the radial direction to the inside, so that the portion of the conducting wire having a shorter conducting wire distance from the input terminal 32 is closer to the outside in the radial direction. Placed in. In other words, the portion of the conducting wire having a longer conducting wire distance from the input terminal 32 is arranged closer to the inside in the radial direction. Therefore, a conductor portion having a relatively short conductor distance from the input terminal 32 is included in the outer side in the radial direction within one slot, and a conductor portion having a relatively longer conductor distance from the input terminal 32 is included in the radially inner side. It can be said that.

  Next, another example of how to wind the stator coil 30 around the stator core 22 will be described with reference to FIG. The upper diagram and the lower diagram in FIG. 5 are substantially the same as those in FIG. 4, and only the numbers indicating the conducting wire insertion order in the lower diagram are different.

  Referring to FIG. 5, the conducting wire 36 that has started to be wound from the input terminal 32 is inserted in the slots S1 to S8 sequentially in the clockwise direction so that the conducting wire 36 that has started to be wound from the input terminal 32 is positioned closest to the outer periphery in the radial direction. Placed in. Next, the conducting wire 36 is continuously wound in the clockwise direction without changing the winding direction. At this time, the height of the conducting wire 36 between each of the slots S1 to S8 and the conducting wire portion already inserted in the outermost peripheral position. A conductor portion is disposed at a position near the outer periphery in the radial direction with an interval substantially corresponding to h. The lower part of FIG. 5 corresponds to the 9th to 16th conductor portions. In the same manner, the 17th to 24th conductor portions that are radially inward and continuous in the same winding direction are sequentially inserted and arranged in the slots S1 to S8.

  When three conductor portions are arranged in each slot in this manner, the winding direction of the conductor 36 is then reversed, and the second radially outer position in the eighth slot S8, that is, 8 The conducting wire 36 is first inserted and arranged between the conducting wire portion and the 16th conducting wire portion. Then, the lead wires 36 are sequentially inserted from the eighth slot S8 to the first slot S1 in the counterclockwise direction from there, and are also arranged at the second position radially outward. Such insertion and arrangement of the conducting wire into the slot cannot be handled by continuously winding one conducting wire drawn from the winding machine. Therefore, in such a case, the stator coil is connected by welding or the like, directly or via a crossover member, between the ends of a plurality of coil portions wound in a predetermined coil shape using a winding die or the like. It may be formed by. Alternatively, two leg portions are inserted into two slots from one side in the axial direction with a plurality of conductor segments formed by bending a short conducting wire into a substantially U shape in the radial direction, and the outside from the slot opening on the other side in the axial direction. It may be realized by a segment type stator coil that forms a coil by sequentially connecting one of the two legs extended to the other leg of an adjacent conductor segment by welding or the like.

  Thereafter, the winding in the counterclockwise direction is continued in the same manner, and the 33rd to 40th conductor portions are inserted and arranged in the gaps between the conductor portions in the eighth slot S8 to the first slot S1, And the 41st-48th conductor part is inserted and arrange | positioned in the radial direction innermost peripheral position, the last 48th conductor part inserted in 1st slot S1 is connected to the neutral point 34, and a stator coil ( That is, the winding of the U-phase coil) is completed.

  Thus, the example shown in FIG. 5 differs from the example of FIG. 4 in that the number of the six conductor portions arranged in one slot is not increased so as to increase from the radially outer side to the inner side. Also in this example as a whole, in one slot, a conductor portion having a short conductor distance from the input terminal 32 is disposed at a position closer to the outer side in the radial direction, and a conductor distance from the input terminal 32 is located closer to the inner side in the radial direction. It can be said that a long conductor portion is arranged.

  4 and 5, the description has been made assuming that the six conductors 36 are inserted and arranged in one slot. However, the number may be an appropriate number as long as it is at least two. Further, the winding method of the stator coil is not limited to the above-described one, and the conductor distance from the input terminal 32 is closer to the outside in the radial direction among the conductors of the stator coil arranged in the radial direction. May be wound in any way as long as a wire portion including a relatively short wire is included and a wire portion including a relatively long wire distance from the input terminal 32 is included near the radially inner side. For example, the conducting wires constituting the stator coil may be wound in the circumferential direction of the stator core while periodically repeating the deviation inward in the radial direction and the deviation in the radial direction.

  Next, the arrangement of the thin insulating material in the slot S will be described with reference to FIGS. In the present embodiment, the thin insulating material is described as the insulating paper, but the present invention is not limited to this, and other thin insulating materials such as an insulating sheet may be used. In FIGS. 6 to 9, a gap is formed between the conductor 36 and the insulating paper and between the insulating paper and the inner wall surface of the slot. They are in contact with each other, and only a gap corresponding to the thickness of the insulating paper is formed between the conductor in the lacking insulating paper and the inner wall surface of the slot.

  FIG. 6 is a cross-sectional view showing an arrangement state of the coil conductor 36 and the insulating paper 50 inserted into one slot S. FIG. FIG. 7 is a view similar to FIG. 6, showing a state in which the radially inner end of the insulating paper 50 is mounted in the slot S in an irregular state. FIG. 8 is a view similar to FIG. 6 showing that the insulating coatings 40 of the plurality of conductive wires 36 arranged on the outer side in the radial direction are formed of a low dielectric constant material. FIG. 9 is a view similar to FIG. 6 showing a state in which the insulating films 40 of a plurality of conducting wires arranged on the outer side in the radial direction are formed relatively thick.

  As shown in FIG. 6, in the stator 12 of the present embodiment, among the six conductors 36 arranged in the slot S, three conductors 36 located closer to the outside in the radial direction, the slot radial inner wall surface 24, and the slot. An insulating paper 50 is interposed between the circumferential inner wall surfaces 26 and 28, and both radially inner ends 52 and 54 of the insulating paper 50 are positioned beside the fourth conductor 36 from the radially outer side. That is, between the three conductors 36 radially inward in the slot S and the slot circumferential inner wall surfaces 26 and 28, there is an insulating paper lacking portion 56 in which no insulating paper is interposed.

  As described above, in the stator 12 of the present embodiment, the six conductors 36 inserted and arranged in the slot S include a conductor part having a relatively short conductor distance from the input terminal 32 on the outer side in the radial direction. It is wound so as to include a conductor portion having a relatively long line distance from the input point on the radially inner side. That is, with respect to the three conductors 36 located on the inner side in the radial direction, the shared voltage is sufficiently reduced because the conductor distance from the input terminal 32 is long, and only the insulating film 40 of the conductor 36 is connected to the stator core 22. Insulation breakdown and partial discharge can be suppressed or prevented. Therefore, by providing the insulating paper lacking portion 56, it is possible to reduce the amount of insulating paper used compared to the case where insulating paper is disposed on substantially the entire inner wall surface of the slot as in the prior art. Cost can be reduced.

  Further, since there is no insulating paper between the slot inner wall surfaces 26 and 28 in the insulating paper lacking portion 56, the copper wire 38 of the conductive wire 36 is made thicker and the occupation of the conductive wire 36 occupying in the slot S is correspondingly increased. The product ratio can be improved. In this case, heat generation due to copper loss is reduced by increasing the diameter of the conducting wire 36 closer to the inner side in the radial direction, and temperature rise of the stator 12 and thus the motor 10 can be suppressed.

  Further, as shown in FIG. 7, the insulating paper 50 is shortened and the insulating paper lacking portion 56 is provided, so that there is no problem even if the positions of the end portions 52 and 54 of the insulating paper 50 are somewhat uneven. There is also an advantage that 12 can be easily assembled.

  Although the stator 12 and the motor 10 using the stator 12 according to the present embodiment have been described above, the present invention is not limited to the above configuration, and various changes and improvements can be made.

  For example, in the above description, it has been described that only the insulating film 40 of the conductive wire 36 is sufficient between the conductive wire 36 and the slot inner wall surfaces 26 and 28 in the insulating paper lacking portion 56. However, as shown in FIG. The insulating film 40 of the conductive wire 36 positioned may be formed of a material having a lower dielectric constant than the insulating film of other conductive wires positioned on the outer side in the radial direction. As a result, it is possible to reliably prevent dielectric breakdown and partial discharge in the lack of insulating paper.

  Further, as shown in FIG. 9, the thickness t of the insulating film 40 of the conductive wire 36 located in the insulating paper lacking portion 56 may be made thicker than the insulating film 40 of the other conductive wires 36 positioned on the outer side in the radial direction. Good. As a result, it is possible to reliably prevent dielectric breakdown and partial discharge in the lack of insulating paper. In this case, if the insulating film is formed of an insulating material having a low dielectric constant as described above, dielectric breakdown and partial discharge can be more reliably prevented.

  Further, in the above description, the length of the insulating paper 50 is assumed to be uniform in each slot S. However, the length is not limited to this, and the length of the insulating paper 50, that is, the portion where the insulating paper 50 is not interposed. The width in the radial direction of the insulating paper lacking portion 56 may be different among a plurality of slots. Specifically, the insulating paper is disposed so that the insulating paper is arranged between the conductor portion located closest to the inner periphery in the slot and the inner wall surface of the slot among the conductor portions having a relatively short distance from the input terminal. The length may be set, and at least one conductor portion inserted and arranged on the inner peripheral side of the conductor portion may be an insulating paper lacking portion. In this case, the radial width of the insulating paper lacking portion may be minimized for one of the slots, and the radial width of the insulating paper lacking portion may be uniform for the other slots, or may be gradually increased. Also good.

  Furthermore, the thickness and dielectric constant of the insulating paper 50 may be set to be different in consideration of the discharge start voltage between the stator core and the conductor portion for each slot.

  DESCRIPTION OF SYMBOLS 10 Motor, 12 Stator, 14 Rotor, 16 Rotor core, 18 Permanent magnet, 20 Rotor shaft, 22 Stator core, 24 Slot radial direction inner wall surface, 26, 28 Slot circumferential direction inner wall surface, 30 Stator coil, 32 Input terminal (input point) , 34 Neutral point (output point), 36 Conductor, 38 Copper wire, 40 Insulating film, 50 Insulating paper, 52, 54 Radial inner ends, 56 Insulating paper missing part, S, S1-S8 slot, T, T1 ~ T8 Teeth.

Claims (4)

A stator core having a plurality of teeth projecting in the circumferential direction on the inner peripheral portion and having a slot formed between adjacent teeth; a stator coil inserted into the slot and wound around the teeth; A stator of a rotating electric machine comprising:
The stator coil is configured to be wound around the stator core while radially shifting a conductive wire covered with an insulating film, one end is connected to the input point, and the other end is connected to the output point.
Within one slot, among the conductors of the stator coil that are arranged side by side in the radial direction, a conductor portion having a relatively short line distance from the input point is included on the radially outer side, closer to the radially inner side. Includes a conductor portion having a relatively long line distance from the input point,
Within the one slot, a thin insulating material is interposed between the lead wire on the radially outer side and the inner wall surface of the slot, while the insulating material is interposed between the lead wire on the radially inner side and the inner wall surface of the slot. It was configured to provide an insulating material lacking part that does not intervene,
A stator for rotating electrical machines. In the stator of the rotating electrical machine according to claim 1,
A stator for a rotating electrical machine, wherein an insulating film of a conductive wire corresponding to the insulating material lacking portion is formed of a material having a lower dielectric constant than an insulating film of a conductive wire located on the outer side in the radial direction. In the stator of the rotating electrical machine according to claim 1 or 2,
A stator for a rotating electrical machine, wherein an insulating film of a conductive wire corresponding to the insulating material lacking portion is formed thicker than an insulating film of a conductive wire portion on the radially outer side. The stator according to any one of claims 1 to 3,
A rotating electric machine comprising: a rotor rotatably provided in the stator.

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