JP6103558B1 - Rotating electric machine - Google Patents

Abstract

A rotating electrical machine capable of facilitating a winding connecting process is provided. In the coil section, a plurality of windings belonging to two sets of three-phase winding groups are wound so as to be alternately arranged in the circumferential direction, the winding belonging to one set and the other set Windings belonging to each other are alternately arranged in the circumferential direction, and each winding has a phase different from that of an adjacent winding, and the first three-phase winding group includes a first bus bar unit. The second bus bar unit is connected to the second three-phase winding group, and the first bus bar unit and the second bus bar unit are opposite to each other in the axial direction of the stator core. Is arranged. [Selection] Figure 4

Description

  The present invention relates to a rotating electrical machine.

  Conventionally, there is a double three-phase motor in which two three-phase windings are provided in one motor (see, for example, Patent Document 1). In this double three-phase motor, the windings are connected on one side in the axial direction.

JP2013-236455A

  In a dual three-phase motor, there are a total of six windings (U1, V1, W1, U2, V2, W2). When electrical connection is made by welding, etc., since the jigs that secure the positions of the terminals to be connected easily interfere with the winding and conductor parts for electrically connecting each phase, precise work There is a problem that is required.

  The present invention has been made in view of the above, and an object of the present invention is to provide a rotating electrical machine capable of facilitating a winding connecting process.

  In order to achieve the above-described object, the present invention includes a rotor that is rotatably provided, and a stator that is disposed radially outside the rotor, and the stator is wound around the stator core and the stator core. The stator core includes a yoke portion and a plurality of teeth portions that are provided radially inward from the yoke portion while maintaining a certain gap with the rotor. A rotary electric machine comprising two sets of three-phase winding groups, a first three-phase winding group and a second three-phase winding group, wherein the two sets of three-phase winding groups Are wound so as to be alternately arranged in the circumferential direction, windings belonging to one set and windings belonging to the other set are alternately arranged in the circumferential direction, Each winding is different in phase from the adjacent winding, and the first winding A first bus bar unit is connected to the phase winding group, a second bus bar unit is connected to the second three-phase winding group, and the first bus bar unit and the first bus bar unit are connected to each other. The second bus bar unit is disposed on the opposite side in the axial direction of the stator core.

  According to the present invention, the winding connection process can be facilitated.

It is a figure which shows the example of application of the rotary electric machine of Embodiment 1 of this invention. It is a figure which shows the structure of a rotary electric machine seeing from one side of the direction where a rotating shaft extends. It is a figure which shows the structure of a rotary electric machine seeing from the other side of the direction where a rotating shaft extends. It is a figure which shows the structure of the rotary electric machine seen from the IV-IV line of FIG. It is a figure of the same aspect as FIG. 2 regarding Embodiment 2 of this invention. It is a figure of the same aspect as FIG. 3 regarding this Embodiment 2. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating an application example of the rotating electrical machine of the first embodiment. The rotating electrical machine 1 includes a first three-phase winding group 11 and a second three-phase winding group 21. The first three-phase winding group 11 is connected to the first inverter 5 a via the current sensor 3. The second three-phase winding group 21 is connected to the second inverter 5b through a similar current sensor 3. The current sensor 3 is connected to the control circuit 7. Further, a rotation sensor 9 that detects the rotation state of the rotating electrical machine 1 is connected to the control circuit 7.

  Next, details of the rotating electrical machine of the first embodiment will be described with reference to FIGS. FIG. 2 is a diagram illustrating the structure of the rotating electrical machine as viewed from one side in the direction in which the rotating shaft extends. FIG. 3 is a diagram illustrating the structure of the rotating electrical machine as viewed from the other side in the direction in which the rotation shaft extends. FIG. 4 is a diagram showing the structure of the rotating electrical machine as seen from line IV-IV in FIG. FIG. 4 is a diagram showing the structure of the rotating electrical machine when viewed from the direction in which the rotation axis points in the vertical direction of the paper and the rotation axis is along the paper.

  The rotating electrical machine 1 includes a rotor 31 that is rotatably provided and a stator 33 that is disposed on the radially outer side of the rotor 31. The rotor 31 has a rotor core 31a and a plurality of magnets 31b. The plurality of magnets 31b are embedded in the circumferential direction at equal angular intervals.

  The stator 33 includes an annular stator core 35 and a coil portion 37 wound around the stator core 35. The stator core 35 includes an annular yoke portion 39 and a plurality of teeth portions 41. Each tooth portion 41 protrudes radially inward from the yoke portion 39. The tip of the tooth portion 41 maintains a certain gap with the rotor 31.

  The relationship between the number of magnetic poles of the rotor and the number of teeth is 2: 3. In the illustrated example, the number of magnetic poles of the rotor is 8, and the number of teeth of the stator is 12.

  The coil portion 37 is concentratedly wound in a concentrated winding manner, that is, concentratedly wound on each of the tooth portions, and the first three-phase winding group and the second three-phase winding that are energized by independent three-phase AC circuits, respectively. It consists of two sets of three-phase winding groups.

  In the coil portion 37, a plurality of windings belonging to two sets of three-phase winding groups are wound so as to be alternately arranged in the circumferential direction. The windings belonging to one set and the windings belonging to the other set are alternately arranged in the circumferential direction. Each winding is different in phase from the adjacent winding.

  The rotating electrical machine 1 has two sets of three-phase winding groups U1, V1, W1, U2, V2, and W2 that are energized by two sets of independent three-phase AC circuits. If the first three-phase winding group is U1, V1, W1, and the second three-phase winding group is U2, V2, W2, the order of U1, V2, W1, U2, V1, W2 is repeated twice. The windings of one set are not adjacent to each other, and different phases are wound around the adjacent teeth.

In the first embodiment, two sets of three-phase winding groups are connected by star connection, and windings of the same phase are connected in parallel. The stator has a conductive member for electrically connecting the windings. In the connection method of the first embodiment, the conductive member is
A conductive member CU1 for connecting U1 phases and connecting to a power supply terminal from the inverter;
A conductive member CV1 connecting the V1 phases and connecting to the power supply terminal from the inverter;
A conductive member CW1 that connects the W1 phases and connects to a power supply terminal from the inverter;
A conductive member N1 connecting the neutral points of the first three-phase winding group;
A conductive member CU2 that connects the U2 phases and connects to a power supply terminal from the inverter;
A conductive member CV2 connecting the V2 phases and connecting to the power supply terminal from the inverter;
A conductive member CW2 that connects the W2 phases and connects to a power supply terminal from the inverter;
A conductive member N2 connecting the neutral points of the second three-phase winding group;
8 are prepared.

  Each of these conductive members needs to be insulated from conductive members connecting other phases, windings of other phases, and peripheral conductors such as a stator core.

  The conductive members CU1, CV1, and CW1 and the conductive members CU2, CV2, and CW2 each include a bus bar portion C4, a connection terminal portion C5, and a power supply terminal portion C6. The bus bar portion C4 extends in an annular shape or an arc shape (C shape) along a concentric circle with the stator core. The connection terminal portion C5 extends radially inward from the bus bar portion C4 and is connected to the coil terminal wire 43. The power feeding terminal portion C6 extends radially outward from the bus bar portion C4 and is connected to the target on the inverter side.

  Each of the conductive members N1 and N2 includes a trunk portion that extends in an annular shape or an arc shape (C shape) along a concentric circle with the stator core, and a connection terminal portion that extends radially inward from the trunk portion and is connected to the coil terminal wire 43. .

  Each conductive member and the winding are connected by welding or caulking.

  In the present embodiment, the first bus bar unit 13 in which the conductive members CU1, CV1, CW1 and the conductive member N1 are held by the first resin holder 45 made of an insulating member, and the second resin holder 47 made of an insulating member. The windings of each phase are connected to the corresponding inverters via the second bus bar unit 23 holding the conductive members CU2, CV2, CW2 and the conductive member N2.

  The first bus bar unit 13 is arranged on one side of the stator core 35 in the axial direction, and the second bus bar unit 23 is installed on the other side of the stator core 35 in the axial direction, that is, the first bus bar unit 13 is installed. It is installed on the opposite side to the side where it is. In other words, the stator core 35 is sandwiched between the first bus bar unit 13 and the second bus bar unit 23 in the rotation axis direction. In other words, the first bus bar unit 13 and the second bus bar unit 13 The bus bar unit 23 is disposed on the opposite side of the stator core 35 with the stator core 35 interposed therebetween. In the illustrated example, the first bus bar unit 13 is disposed on one side in the axial direction of the stator core 35 as shown in FIG. 4, and the second bus bar unit 23 is disposed on the other side in the axial direction of the stator core 35. 4 is arranged on the lower side of the sheet of FIG.

  The first bus bar unit 13 and the second bus bar unit 23 are respectively installed near the end faces on both sides of the stator core 35. That is, the first bus bar unit 13 and the second bus bar unit 23 are respectively provided to face the corresponding end surfaces of the stator core 35. The radial positions of the first bus bar unit 13 and the second bus bar unit 23 are located outside the windings.

  The stator 33 includes an insulator 49 that insulates the coil portion 37 from the stator core 35. Each of the first bus bar unit 13 and the second bus bar unit 23 is supported by a corresponding insulator 49. That is, the first resin holder 45 and the second resin holder 47 are fixed to the corresponding insulators 49. The insulators 49 are provided on both sides of the axial end surface of the stator core 35. The insulator 49 includes a trunk portion 51 along the axial end surface of the tooth portion, a first wall portion 53 located on the radially outer diameter side of the trunk portion 51, and a second wall located on the radially inner side of the trunk portion 51. Wall portion 55.

  Each winding constituting each three-phase winding group is wound while being insulated from the stator core through a recess formed by the body portion 51, the first wall portion 53, and the second wall portion 55. In this embodiment, the side surface of the stator core and the coil portion are insulated by interposing the insulating paper 57. Note that the insulator may be a bobbin having a structure in which the side surface of the stator core and the coil portion are integrated with each other.

  With respect to the first bus bar unit 13 and the second bus bar unit 23, the bus bar portion, which is the portion accommodated in the resin holder, is in the same position as the winding in the axial direction. That is, the bus bar portion is positioned within the range occupied in the axial direction of the winding as the axial position. Thereby, an axial direction dimension can be suppressed rather than installing a bus-bar unit in the position which remove | deviated from the range which a coil part occupies regarding the position of an axial direction. In addition, by dividing the bus bar unit into two, the space on the outer diameter side of the coil portion at both ends in the axial direction of the stator can be used, so that the motor size can be suppressed.

  As described above, in the first embodiment, each phase and the inverter are connected by the conductive members (U1, V1, W1, U2, V2, and W2), and the conductive member is held by the resin holder that is an insulating member. However, it is configured to insulate from other phase conductive members, windings and surrounding conductors. A stator is a bus bar that combines a bus bar portion that electrically connects windings of the same phase with two sets of three-phase winding groups while insulating the bus bar portion of the other phase, windings, and surrounding conductors with an insulator. Have a unit. One bus bar unit is provided for each group of three-phase winding groups, and the two bus bar units are respectively provided on end surfaces opposite in the axial direction of the stator core.

  That is, since the first three-phase winding group and the second three-phase winding group are connected to the respective conductive members on the opposite surface in the axial direction of the stator, one surface in the axial direction of the stator Then, the connection between the winding and the conductive member is performed for every other tooth. As described above, since the connection terminal and the coil terminal line are connected to every other tooth, it is easy to secure the distance between the connection terminals, and when connecting the connection terminal and the coil terminal line, It is easy to secure a space for arranging the jig and the jig for securing the position, and the winding connection process can be facilitated. In particular, a double three-phase motor has a total of six phases (U1, V1, W1, U2, V2, and W2) of windings. Therefore, when the number of teeth of the stator core is large, the space for providing the connecting portion is reduced. There is a problem that the layout for maintaining insulation between phases becomes complicated. Furthermore, for electrical connection between windings, when working with a jig that secures the position of the terminals to be connected, or a jig that connects welding or caulking, the jig is attached to the other terminals. If it is swung, there is a problem that the positional relationship of the terminals changes and the insulation property for each phase deteriorates. Even with respect to such a problem, the rotating electric machine according to the first embodiment has advantages in that the layout is not complicated and the jig is easy to use.

  In this embodiment, a resin holder is used for holding and insulating the bus bar unit. When molding such a resin holder, the size of the resin holder is smaller than when all the conductive members are held, so the size of the bus bar unit can be reduced, and the resin can be molded easily. There is also an effect that the forming process becomes easy.

  Further, as shown in FIGS. 2 and 3, the first bus bar unit 13 and the second bus bar unit 23 can be installed at similar positions / modes on both sides of the stator 33 in the axial direction. For this reason, it is possible to share the parts constituting the insulating member such as the resin holder and the parts constituting the conductor parts, and the motor can be manufactured at low cost while suppressing the part price.

  The bus bar unit can be efficiently manufactured by insert molding so that the resin member is positioned outside the conductive member. In this case, however, all the conductive members are compared to a single bus bar unit. Thus, it is possible to reduce the number of parts to be inserted and to obtain an advantage that the manufacture becomes easier.

  Moreover, since the bus bar unit is fixed to the insulator on the inner diameter side thereof, the radial dimension of the rotating electrical machine can be suppressed.

Embodiment 2. FIG.
Next, Embodiment 2 of the present invention will be described with reference to FIGS. The second embodiment is the same as the first embodiment described above except for the parts described below. 5 and FIG. 6 are diagrams of the same mode as FIG. 2 and FIG.

  Briefly described in the second embodiment, with respect to each of the two sets of three-phase winding group bus bar units, one set of bus bar units is wound with the other set of three-phase winding group windings. The other set of bus bar units is fixed to the insulator disposed in the tooth portion, and the other set of bus bar units is disposed in the tooth portion where the winding of the one-phase three-phase winding group is wound. It is fixed to the insulator. That is, each of the two bus bar units is fixed to an insulator arranged in a tooth portion around which a coil that is not connected to the bus bar of the bus bar unit is wound.

  Referring to the example of FIG. 5, the resin holder of the U1 phase bus bar unit is provided with a fixing portion 59. The fixing portion 59 is a V2 phase winding that is not connected to the U1 phase conductive member. It is being fixed to the insulator arrange | positioned at the teeth part by which the wire is wound.

  The fixing part 59 is a convex part protruding to the inner diameter side of the resin holder, and this convex part is connected and fixed to the insulator. As the fixing method, pin welding, heat caulking, adhesion, or the like can be considered.

  In this embodiment, since the bus bar unit is fixed inside the outer diameter of the stator core, the radial dimension of the stator can be suppressed as compared with a case where the bus bar unit is fixed to a casing or the like for fixing the stator.

  In addition, even when the shape of the case that fixes the stator is different on both sides in the stator axial direction, it can be fixed to the first bus bar unit and the second bus bar unit by the same method, and the fixing work Thus, the number of types of parts can be reduced and a motor can be manufactured at low cost.

  In this embodiment, for example, the insulator that fixes the first bus bar unit is installed in a tooth around which the second three-phase winding group is wound. Similarly, an insulator for fixing the second bus bar unit is installed in a tooth around which the first three-phase winding group is wound. For this reason, the fixing of the bus bar unit and the connection with the coil terminal wire are performed on alternate teeth, so the distance between the fixing portion of the bus bar unit and the connecting portion is increased, which is necessary for connection work and fixing work. There is an effect that it becomes difficult for the jig and each part to interfere with each other, and each work becomes easy.

  Although the contents of the present invention have been specifically described with reference to the preferred embodiments, various modifications can be made by those skilled in the art based on the basic technical idea and teachings of the present invention. It is self-explanatory.

  For example, the present invention may be implemented with a delta connection. It is also conceivable that the present invention is implemented by connecting in-phase windings in series.

  DESCRIPTION OF SYMBOLS 1 Rotating electrical machine, 11 1st three-phase winding group, 13 1st bus-bar unit, 21 2nd 3-phase winding group, 23 2nd bus-bar unit, 31 Rotor, 33 Stator, 35 Stator core, 37 Coil part , 39 Yoke part, 41 teeth part, 51 trunk part, 53 1st wall part, 55 2nd wall part.

Claims (3)

A rotor provided rotatably,
A stator disposed on the radially outer side of the rotor,
The stator includes a stator core and a coil portion wound around the stator core, and the stator core is provided with a certain gap from the rotor while projecting radially inward from the yoke portion and the yoke portion. A plurality of teeth portions,
The coil portion is a rotating electrical machine composed of two sets of three-phase winding groups, a first three-phase winding group and a second three-phase winding group,
In the coil section, a plurality of windings belonging to the two sets of three-phase winding groups are wound so as to be alternately arranged in the circumferential direction, and windings belonging to one set and windings belonging to the other set are wound. Lines are arranged alternately in the circumferential direction,
A first bus bar unit is connected to the first three-phase winding group, and a second bus bar unit is connected to the second three-phase winding group,
The first bus bar unit and the second bus bar unit are arranged on opposite sides in the axial direction of the stator core,
The stator includes an insulator that insulates the coil portion and the stator core;
Each of the first bus bar unit and the second bus bar unit is supported by the corresponding insulator,
In each of the bus bar units of the two sets of three-phase winding groups, the conductive member of each phase of one set is connected to the teeth portion on which the windings of the other set of three-phase winding groups are wound. It is fixed to the arranged insulator, and the conductive member of each phase of the other set is arranged in the teeth portion around which the winding of the three-phase winding group of the one set is wound. Fixed to the insulator,
Rotating electric machine. The first bus bar unit and the second bus bar unit are provided to face the corresponding end surfaces of the stator core, and are disposed on the radially outer side than the coil portion.
The rotating electrical machine according to claim 1. The insulator includes a body portion along an axial end surface of the teeth portion, a first wall portion located on a radially outer diameter side of the body portion, and a second wall located on a radially inner diameter side of the trunk portion. And a wall,
Each winding constituting each of the three-phase winding groups is wound while being insulated from the stator core through a recess formed by the body portion, the first wall portion, and the second wall portion. Is ,
The rotating electrical machine according to claim 1 or 2.

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