JP6003314B2 - Stator for rotating electrical machine - Google Patents

Description

  The present invention relates to a stator for a rotating electrical machine, and more particularly to a stator for a rotating electrical machine in which eddy current loss occurs in a stator coil winding due to leakage magnetic flux from a rotor.

  When a drive current is supplied to the coil winding of the stator that constitutes the rotating electrical machine, the stator generates a rotating magnetic field, and the rotor rotates. At this time, a part of the magnetic flux from the rotor to the stator becomes a leakage magnetic flux and penetrates the coil winding, and eddy current loss occurs in the stator coil winding due to the change in the magnetic flux.

  For example, Patent Document 1 points out that the eddy current loss of the coil winding wound around the teeth of the stator core increases as it approaches the rotor side, which is the inner peripheral side of the stator core, and decreases toward the outer peripheral side. Therefore, it is disclosed that the coil winding on the inner peripheral side of the stator core is a divided cross-sectional type and the coil winding on the outer peripheral side is a single cross-sectional type.

  In Patent Document 2, if the rotating electrical machine winding conductor is composed of a collective conductor, the generation of eddy currents can be suppressed and the space factor can be improved. It points out that it will be difficult. Therefore, one layer is divided into a plurality of conductor wires in a plane, the layers are stacked in layers, and the layers between the conductor wires and the layers of the plurality of layers are coupled by a simple insulating portion. It is disclosed that a bending process is facilitated by configuring a collective conducting wire.

JP2012-110114A JP 2011-188721 A

  If the coil winding is a collective conducting wire and the number of divisions is increased, eddy current loss can be further reduced. However, increasing the number of assembly conductors increases the insulation coating process, complicates the process of bundling the conductor wires, and makes the bending and twisting processes more difficult. The rate drops.

  The objective of this invention is providing the stator for rotary electric machines which can reduce an eddy current loss effectively, ensuring the space factor of a coil winding.

Stator for rotary electric machine according to the present invention includes: a stator core having a plurality of teeth disposed along the circumferential direction, is wound several times around the teeth, at least in part, divides the cross section into a plurality of conductor element wires and, a plurality of conductor wires divided by again collecting together and a coil winding portion which is constituted by the assembly conducting wire and one coil, in the coil winding is composed of a set wire The coil winding is a coil winding whose cross section is divided into a predetermined plurality of collective conductors in accordance with the direction of the leakage magnetic flux from the rotor passing through the coil winding, and the coil winding on the inner peripheral side of the stator core is And a plurality of predetermined conductor strands divided in parallel to the radial direction of the stator core are composed of collective conducting wires laminated in the circumferential direction with the same plurality of layers as the predetermined plurality divided in parallel to the radial direction. , Coil on the outer peripheral side of the stator core Line is composed of circumferentially parallel divided predetermined plurality of sets conductors conductor strands are laminated in the radial direction at the same plurality of layers and a predetermined plurality of divided parallel to the circumferential direction of the stator core It is characterized by.

  In the stator for a rotating electrical machine according to the present invention, the cross-sectional shape of the conductor wire of the inner peripheral side coil winding is preferably the same as the cross-sectional shape of the conductor wire of the outer peripheral coil winding.

  In the above-described configuration, the stator for a rotating electrical machine uses a collective conducting wire in which a plurality of conductor wires divided in parallel with the main direction of the leakage magnetic flux of the rotor passing through the coil winding are stacked as the coil winding. The leakage magnetic flux of the rotor does not flow in a uniform direction, but flows along the radial direction of the stator core on the inner circumferential side of the stator core, and flows along the circumferential direction of the stator core on the outer circumferential side of the stator core. By matching the direction of division of the collective conducting wire to the direction of the leakage magnetic flux, the eddy current loop can be shortened and eddy current loss can be effectively suppressed. Further, it is not necessary to increase the number of divisions simply by changing the dividing direction of the collective conducting wire, so that the space factor can be ensured.

  In the stator for a rotating electrical machine, the inner peripheral side coil winding is divided into parallel to the radial direction of the stator core in accordance with the direction of the leakage magnetic flux of the rotor, and the outer peripheral side coil winding of the stator core is the stator core. The collective conducting wire divided in parallel with the circumferential direction is used. Thereby, the dividing direction of the collective conducting wire can be matched with the direction of the leakage magnetic flux.

  Further, in the stator for a rotating electrical machine, the inner peripheral coil winding and the outer peripheral coil winding use conductor wires having the same cross-sectional shape and only change the dividing direction of the collective conductor. Thus, eddy current loss can be suppressed while ensuring the space factor without increasing the types of windings.

It is the top view and partial enlarged view of the stator for rotary electric machines in embodiment which concerns on this invention. It is a figure which shows a mode that the division direction of an assembly conducting wire is changed using the conducting wire with the same cross-sectional area in the stator for rotary electric machines of embodiment which concerns on this invention. It is a figure which shows the relationship between the direction of a leakage magnetic flux, and the direction of division | segmentation of an assembly conducting wire in the stator for rotary electric machines of embodiment which concerns on this invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the following description, the coil winding is described as being wound by the concentrated winding method, but may be wound by the distributed winding method. In addition, a coil winding using a rectangular conductor with a rectangular cross section is described, but this is an illustrative example, and a round conductor having a circular cross section, a conductor having an elliptical cross section, and a rectangular corner. You may use the conducting wire etc. of the substantially rectangular cross section which rounded. The number of teeth portions of the stator core, the number of turns of the coil winding, the number of divisions in the collective conducting wire, etc. described below are examples for explanation, and can be appropriately changed according to the specifications of the stator for a rotating electrical machine.

  Hereinafter, in all the drawings, the same reference numerals are given to one or corresponding elements, and redundant description is omitted.

  1A and 1B are diagrams showing a stator 10 for a rotating electrical machine. FIG. 1A is a plan view with a part broken away, and FIG. 1B is an enlarged view of one slot. In FIG. 1, although not a component of the rotating electrical machine stator 10, the rotor 6 and the rotating shaft 8 that fixes the rotor 6 are shown. The stator 10 for rotating electrical machines cooperates with the rotor 6 in an electromagnetic action to rotate the rotor 6 and output torque to the rotating shaft 8.

  The stator 10 for a rotating electrical machine is adjacent to a stator core 12, a plurality of tooth portions 14 arranged along the circumferential direction of the stator core 12, and a tip portion 16 that is a part of the tooth portion 14 and faces the rotor 6. A slot 18 that is a space between the teeth 14 and a coil winding 20 that passes through the slot 18 and is wound around the teeth 14 a plurality of times are included.

  The stator core 12 is an annular magnetic member in which a plurality of tooth portions 14 are disposed on the inner peripheral side. In FIG. 1, a stator core 12 having twelve teeth portions 14 is shown. The starter core 12 is formed by laminating a plurality of electromagnetic steel plates having a predetermined shape.

  The coil winding part 20 is a conductor with insulation coating that is wound around each of the teeth parts 14 in a concentrated winding manner with a predetermined number of turns. When a drive signal is supplied to each of the plurality of coil winding portions 20 from a drive circuit (not shown) in a predetermined order, a magnetic field is sequentially generated at the tip portions 16 of the plurality of tooth portions 14, and A rotating magnetic field is formed.

  The insulator 32 is an insulator disposed between the stator core 12 and the coil winding portion 20 and between the two coil winding portions 20 disposed in the same slot portion 18. As the insulator 32, an appropriate plastic sheet can be used. Instead of this, an insulating resin may be applied to the outer periphery of each coil winding portion 20.

  The number of turns of the coil winding part 20 wound around each tooth part 14 is set in advance. In FIG. 1, a coil winding portion 20 wound around each tooth portion 14 is shown, and each winding of the coil winding portion 20 is shown as coil windings 22, 24, 26, 28, 30. ing. Here, a collective conducting wire is used for at least a part of the coil winding portion 20.

  A collective conductor corresponds to a single cross-section type conductor composed of one conductor in cross section, and the cross section is divided into a plurality of conductor strands, and the plurality of divided conductor strands are assembled again. One coil winding. The plurality of divided conductor wires are electrically insulated. The collective conductor divides the same cross-sectional area as the single cross-section type conductor into multiple sections, so the loop of the eddy current generated by the leakage flux interlinked with the coil winding is shorter than the single cross-section type conductor. Thus, eddy current loss can be reduced. Moreover, the space factor of the coil winding part 20 in the slot part 18 can also be improved by appropriate division | segmentation.

  The fact that the collective conducting wire is used for at least a part of the coil winding portion 20 means that, for example, all five turns may be used as a collective conducting wire, and a part of the five turns may be used as a collective conducting wire, and the rest may be a single-section type conducting wire. It means that it is good. In FIG. 1 (b), a single cross-section type conductor is used for the three coil windings 22, 24, 26 on the outer peripheral side of the stator core 12 among the five windings of the coil winding portion 20. Collective conducting wires are used for the two coil windings 28 and 30 on the inner peripheral side. In addition, a conductive adhesive is used for the connection between the single cross-section type conductor and the collective conductor. Instead of this, the single cross-section conductor and the assembly conductor may be connected by welding.

  As the two coil windings 28 and 30 on the inner peripheral side of the stator core 12, a collective conducting wire whose cross section is divided by three conductor strands is used, but the innermost coil winding 30 of the stator core 12 is used. The direction in which the conductor wires are divided differs from the direction in which the conductor wires of the coil winding 28 on the outer peripheral side of the stator core 12 are located with respect to the coil winding 30.

  In FIG. 1, the number of turns of the coil winding portion 20 wound around each tooth portion 14 is five, but other turns may be used. Further, among the 5 windings, 3 windings are single cross-section conducting wires, and 2 windings are collective conducting wires. However, in the stator core 12, a single cross-section conducting wire is wound on the outer peripheral side, and more on the inner peripheral side. It is only necessary that the collective conducting wire is wound around, and the distribution of the single-section type conducting wire and the collective conducting wire may be other than this. Further, although the assembly conductor is divided into three conductor strands, other division numbers may be used.

  FIG. 2 is a diagram comparing the two coil windings 28 and 30. FIG. 2A is a cross-sectional view of the coil winding 28 wound on the outer peripheral side, and FIG. It is sectional drawing of the coil winding 30 wound by the circumference side. Each of the coil windings 28 and 30 uses three conductor wires 34, and the outer periphery of each conductor wire 34 is covered with an insulating layer 36. Thereby, the three conductor strands 34 constituting the coil winding 28 are electrically insulated. Similarly, the three conductor wires 34 constituting the coil winding 30 are also electrically insulated.

  A copper wire is used as the single cross-section conducting wire or conductor wire 34. Instead of the copper wire, a conductive wire made of aluminum, silver, iron, gold, or an alloy thereof may be used. In addition, as the insulating coating of the coil winding portion 20 and the insulating layer 36 on the outer periphery of the conductor wire 34, an imide resin such as polyimide, polyamideimide, or polyesterimide is used. Instead, polyvinyl butyral, polyamide, and epoxy-based fusion materials, ethylene-vinyl acetate copolymer resins (EVA resins), acrylic, urethane, and silicone insulating adhesives may be used. it can.

  Each conductor wire 34 has a rectangular cross-sectional shape having a rectangular cross-sectional shape with a longer dimension A and a shorter dimension B. Here, it is assumed that A = 3B, assuming that the thickness of the insulating layer 36 is negligibly small compared to the dimensions A and B. That is, the coil windings 28 and 30 both have a square cross-sectional shape with a side length of A (= 3B). The difference between the coil windings 28 and 30 is whether the direction of dividing the square cross section into three is the horizontal direction or the vertical direction.

  With reference to FIG. 1, the circumferential direction and radial direction of the stator core 12 are shown in FIG. On the paper surface of FIG. 2, the horizontal direction is the circumferential direction of the stator core 12, and the vertical direction is the radial direction of the stator core 12. Therefore, in the coil winding 28 wound on the outer peripheral side of the stator core 12, the three conductor strands 34 divided in parallel to the circumferential direction of the stator core 12 are laminated in the radial direction. In the coil winding 30 on the innermost circumferential side of the stator core 12, three conductor strands 34 that are divided in parallel to the radial direction of the stator core 12 are laminated in the circumferential direction.

  FIG. 3 is a diagram showing the effect of the above configuration. FIG. 3 is a diagram corresponding to FIG. 1B, but the leakage magnetic flux 40 acting on the coil windings 22, 24, 26, 28, 30 is indicated by arrows. The magnetic flux from the rotor 6 mainly flows through the tip portion 16 of the tooth portion 14 through the tooth portion 14 having a small magnetic resistance, but when the teeth portion 14 is magnetically saturated or close to magnetic saturation, the teeth portion 14. Leaks from the tooth portion 14 without passing through the distal end portion 16 of the lip and passes through the slot portion 18. This is the leakage magnetic flux 40 that acts on the coil windings 22, 24, 26, and 28.

  The direction of the leakage magnetic flux 40 that does not pass through the tip portion 16 of the tooth portion 14 is substantially parallel to the radial direction of the stator core 12 on the innermost peripheral side of the stator core 12. As the leakage magnetic flux 40 goes from the innermost circumferential side to the outer circumferential side, the leakage magnetic flux 40 is directed to the tooth portion 14 having a smaller magnetic resistance than the slot portion 18, so that the direction gradually becomes parallel to the circumferential direction of the stator core 12. In FIG. 3, at the position of the coil winding 30 wound on the innermost peripheral side of the stator core 12, the direction of the leakage magnetic flux 40 is substantially parallel to the radial direction of the stator core 12. At the position of the coil winding 28 that is wound around the outer periphery of the stator core 12, the direction of the leakage magnetic flux 40 is substantially parallel to the circumferential direction of the stator core 12.

  In the coil winding 30, three conductor strands 34 that are divided in parallel to the radial direction of the stator core 12 are laminated in the circumferential direction, and this division direction is the main direction of the leakage magnetic flux 40 at the position of the coil winding 30. Parallel to the direction. Further, the coil winding 28 has three conductor strands 34 that are divided in parallel to the circumferential direction of the stator core 12 and are laminated in the radial direction. Parallel to the main direction. As described above, the coil windings 28 and 30 formed of the collective conducting wires are laminated with a plurality of conductor strands 34 that are divided in parallel in the main direction of the leakage magnetic flux 40 that passes through the coil windings 28 and 30. .

  Thus, by making the dividing direction of the collective conducting wire parallel to the main direction of the leakage magnetic flux 40, the loop of the eddy current can be shortened, and the eddy current loss can be effectively suppressed. For example, in the coil winding 28, the leakage magnetic flux 40 passes substantially perpendicularly to the radial surface, but the radial surface is divided into three by the three conductor wires 34, and therefore flows to the radial surface. The length of the eddy current loop is about 1/3. Similarly, in the coil winding 30, the leakage magnetic flux 40 passes substantially perpendicularly to the circumferential surface. However, since the circumferential surface is divided into three by the three conductor wires 34, The loop length of the eddy current flowing is about 1/3. Thereby, the eddy current loss resulting from the fluctuation | variation of the leakage magnetic flux 40 can be suppressed effectively.

  Further, as described with reference to FIG. 2, the coil windings 28 and 30 are only changed in the stacking direction of the conductor wires 34 having the same cross-sectional shape, so that it is not necessary to increase the types of coil windings. Moreover, since the coil windings 28 and 30 have the same cross-sectional area, the space factor can be maintained.

  6 Rotor, 8 Rotating shaft, 10 Rotating electrical machine stator, 12 Stator core, 14 Teeth section, 16 Tip section, 18 Slot section, 20 Coil winding section, 22, 24, 26 (Consists of single cross section type conductor) Coil winding, 28, 30 Coil winding (consisting of collective conducting wire), 32 insulator, 34 conductor wire, 36 insulating layer, 40 leakage flux.

Claims (2)

A stator core having a plurality of teeth disposed along the circumferential direction;
Wound several times around the teeth, at least in part, by dividing the cross section into a plurality of conductor element wires, a plurality of conductor wires divided was again consists of a set conductors was one coil is engaged condensing A coil winding section;
With
In the coil winding portion, the coil winding constituted by the collective conducting wire is a coil winding obtained by dividing the cross section into a plurality of predetermined collective conducting wires in accordance with the direction of the leakage magnetic flux from the rotor passing through the coil winding. Because
The coil winding on the inner peripheral side of the stator core is formed of a plurality of predetermined conductor strands divided in parallel with the radial direction of the stator core in the circumferential direction with the same plurality of layers divided in parallel with the radial direction. Consists of laminated conductor wires,
The coil winding on the outer peripheral side of the stator core is laminated in the radial direction with a plurality of predetermined conductor strands divided in parallel to the circumferential direction of the stator core in the same plurality of layers divided in parallel to the circumferential direction. A stator for a rotating electric machine, characterized in that the stator is composed of a collective conducting wire. The stator for a rotating electrical machine according to claim 1,
A stator for a rotating electrical machine, wherein a cross-sectional shape of a conductor wire of an inner peripheral side coil winding is the same cross-sectional shape as a conductor wire of an outer peripheral side coil winding.

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