JP5660402B2 - Rotating electric machine - Google Patents

Description

  The disclosed embodiment relates to a rotating electrical machine.

  Patent Document 1 describes a rotating electrical machine in which an annular sheet-like insulator is disposed at one axial end of an annular stator core.

JP 2002-176753 A (FIG. 15)

  In the structure in which a plurality of insulators are arranged in the circumferential direction on the annular stator core as in the above prior art, the windings for connecting the windings (in other words, coils) of each insulator or connecting the coils to each other, In some cases, the stator core extends along one axial end of the stator core. If this extended winding accidentally enters the gap between two adjacent insulators, the winding may be close to the stator core, resulting in a decrease in insulation.

  This invention is made | formed in view of such a problem, and it aims at providing the rotary electric machine which can prevent the insulation fall.

  In order to solve the above-described problem, according to one aspect of the present invention, a plurality of insulators wound with windings are arranged in a circumferential direction, a stator having a stator core, and a diameter of the stator. A rotor provided on the inner side or the outer side and provided with a rotating shaft, and an insulator provided on the one axial end of the stator core so as to surround the counter-rotor side of the plurality of insulators; As the insulator, a rotating electrical machine including a projecting portion projecting toward the rotor side toward a gap between two adjacent insulators is applied.

  According to the rotating electrical machine of the present invention, it is possible to prevent a decrease in insulation.

It is a sectional side view showing the whole rotary electric machine composition of one embodiment. It is an AA arrow line view of FIG. It is explanatory drawing for demonstrating the example of the coil winding procedure of a stator coil. It is a top view showing the whole structure of an insulating sheet. It is the elements on larger scale of FIG. 4 showing the detailed structure of an insulating sheet. It is a perspective view equivalent to the partial enlarged view of FIG. 2 showing the detailed structure of the protrusion part of an insulating sheet. It is the perspective view showing an example of the crossing state of the connecting wire in the protrusion part vicinity of an insulating sheet, and the perspective view showing the actual binding state in the said site | part. It is explanatory drawing equivalent to the BB arrow line view in FIG. 2 showing the effect in which a protrusion part suppresses the insulation failure by the crossover which entered the space | gap. In the modification which has an insulating sheet provided with the protrusion part with a long length, it is explanatory drawing showing the effect which a protrusion part suppresses the insulation defect by the crossover which entered the space | gap.

  Hereinafter, an embodiment will be described with reference to the drawings.

<Overall configuration of rotating electrical machine>
First, the whole structure of the rotary electric machine 1 of this embodiment is demonstrated using FIG.1 and FIG.2. As shown in FIGS. 1 and 2, the rotating electrical machine 1 is an inner rotor type electric motor that includes a substantially cylindrical rotor 2 and a substantially cylindrical stator 3 provided outside the rotor 2. is there. The rotor 2 has a rotation shaft 8. Hereinafter, the radial direction of the rotor 2 and the stator 3 will be simply referred to as “radial direction”, and the axial direction of the rotor 2 and the stator 3 will be simply referred to as “axial direction”.

  The rotating electrical machine 1 includes a substantially cylindrical frame 9, an anti-load side bracket 11 that closes an opening on one side in the axial direction of the frame 9 (that is, the anti-load side, left side in FIG. 1), and the axis of the frame 9. And a load side bracket 12 that closes the opening on the other side in the direction (that is, the load side; the right side in FIG. 1). The anti-load side bracket 11 and the load side bracket 12 rotatably support the rotary shaft 8 via a bearing 10a and a bearing 10b, respectively.

  The rotor 2 is fixed to the rotating shaft 8. The rotor 2 includes a plurality of permanent magnets 7 each extending in the axial direction. The plurality of permanent magnets 7 are arranged along the circumferential direction at the peripheral edge of the rotor 2 (only two permanent magnets 7 are schematically shown in FIG. 2). The rotor 2 is provided with a magnetic gap from the stator 3.

<Detailed structure of stator>
The stator 3 includes a stator core 4 fixed to the inner peripheral surface of the frame 9, and a plurality (12 in this example) of stator coils 5 arranged along the circumferential direction of the stator core 4. ing. The stator core 4 is provided with a plurality of (in this example, twelve) teeth 13 on the radially inner side. The plurality of teeth 13 are arranged along the circumferential direction while penetrating in the axial direction. In this example, at least the coil end 5a on the other side (right side in FIG. 1) in the axial direction of the stator coil 5 has an end portion 4a on the same side as the other side in the axial direction of the stator core 4 (in FIG. 1). (Right side) In this example, the stator core 4 is configured by arranging a plurality of divided cores 4A in the circumferential direction, but may be a single cylindrical core.

<Winding winding>
The stator coil 5 is formed by winding a winding 17 around the insulator 16 attached to the tooth 13 of the stator core 4. In this example, the insulator 16 is a substantially rectangular frame having a hole along the radial direction inside. The insulator 16 includes a flange portion 16a and a flange portion 16b on the inner peripheral side and the outer peripheral side in the radial direction, respectively. A plurality of the insulators 16 are arranged along the circumferential direction of the stator core 4 by fitting the holes into the teeth 13 of the stator core 4 in the radial direction from the inner peripheral side. Linear portions on both sides in the circumferential direction of the insulator 16 attached to the tooth 13 are accommodated in a slot 14 that is formed between two adjacent teeth 13 and 13 and penetrates in the axial direction. The winding 17 wound around the insulator 16 is accommodated in a gap 15 formed between two adjacent insulators 16 and 16. The insulator 16 is divided in half into a half 13 having a flange similar to the flange 16a and a half having a flange similar to the flange 16b to the teeth 13 of the stator core 4 in the axial direction. Various types can be used, such as fitting from both ends, or fitting from both sides in the radial direction to the teeth 13 of the stator core 4.

<Method of ensuring insulation>
The details of the method for securing insulation of the connecting wires for connecting the windings 17 of the respective insulators 16 and connecting the stator coils 5 to each other when the coils are formed in each of the plurality of insulators 16 will be described in the following order. I will explain later.

<Example of coil winding mode>
In the stator coil 5, for each phase of the U phase, the V phase, and the W phase, a coil having a forward current direction and a coil having a reverse direction are provided. For example, two stator coils 5 and 5 that face each other in the radial direction are set as one set, and two sets of adjacent four stator coils 5 respectively make a U-phase coil, a V-phase coil, or a W-phase coil. Is configured.

  That is, for example, as shown in FIG. 2, the positions of the plurality of insulators 16 (in other words, the stator coil 5) are set in the clockwise direction as # 1 position, # 2 position, # 3 position,. Position # 12.

  In FIG. 2, in this example, the windings 17 are wound around the insulators 16 and 16 at the # 2 position and the # 8 position facing each other in the radial direction so that the current direction is the forward direction. A set of V-phase coils 5Va, 5Va (in the direction) is configured.

  Further, the insulators 16 and 16 at the # 3 position and the # 9 position on the right side along the clockwise direction of the # 2 position and the # 8 position (hereinafter simply referred to as “right side”), which are opposed to each other in the radial direction, The winding 17 is wound so that the direction of the current is opposite to each other, and a set of V-phase coils 5Vb and 5Vb (in the opposite direction) is configured.

  Further, the windings 17 are arranged so that the current direction is the forward direction to the insulators 16 and 16 at the # 4 position and the # 10 position that are further to the right of the # 3 position and the # 9 position and that are opposed to each other in the radial direction. A set of W-phase coils 5Wa and 5Wa (in the forward direction) is wound.

  Further, the windings 17 are arranged so that the current direction is opposite to the insulators 16 and 16 at the # 5 position and the # 11 position, which are further to the right of the # 4 position and the # 10 position, and are opposed to each other in the radial direction. A set of V-phase coils 5Wb and 5Wb (in the reverse direction) is wound.

  Further, the windings 17 are arranged so that the current direction is forward to the insulators 16 and 16 at the # 6 position and the # 12 position, which are further to the right of the # 5 position and the # 11 position, and are opposed to each other in the radial direction. A set of U-phase coils 5Ua and 5Ua (in the forward direction) is wound.

  In addition, the windings 17 are arranged on the insulators 16 and 16 at the # 7 position and the # 1 position, which are further to the right of the # 6 position and the # 12 position, and are opposed to each other in the radial direction. A pair of U-phase coils 5Ub and 5Ub in the opposite direction is wound.

<Winding extension>
Here, on the one axial side of the stator core 4 (on the anti-load side, the left side in FIG. 1, the front side in FIG. 2), the radially outer side of the plurality of insulators 16, that is, the rotor 2. Is provided with a substantially annular winding extension 20 (see also FIG. 3, FIG. 6, FIG. 7, etc., which will be described later) so as to be on the opposite side (hereinafter referred to as “anti-rotor side” as appropriate). In the winding extension portion 20, a connecting wire for connecting the winding 17 of each insulator 16 and connecting the stator coils 5 to each other (see connecting wires 18 a to 18 f described later) is extended. . In this example, the winding connection portion 20 is a shallow annular shape surrounded by the flange portion 16b (see FIG. 2) on the outer peripheral side of the insulator 16 and a small protrusion-like edge portion 19 on the outer peripheral side of the stator core 4. It is a groove.

<Example of coil winding procedure>
Along with the arrangement example of the U-phase coil, the V-phase coil, and the W-phase coil described above with reference to FIG. Will be explained. In addition, in order to avoid the complexity of illustration, illustration is abbreviate | omitting the insulating sheet 21 provided in the coil | winding connection part 20 of the stator core 4. FIG.

  In FIG. 3, the illustrated state represents a state in which the winding of the winding 17 around the insulator 16 is completed for the U phase and the W phase among the U phase, the V phase, and the W phase. That is, for the U phase, forward U-phase coils 5Ua and 5Ua at the # 6 position and # 12 position, and reverse U-phase coils 5Ub and 5Ub at the # 7 position and # 1 position are formed. . For the W phase, forward W phase coils 5Wa and 5Wa at positions # 4 and # 10, and reverse W phase coils 5Wb and 5Wb at positions # 5 and # 11 are formed. .

<Winding of coil at # 2 position>
A procedure for winding the V-phase stator coil 5 from the above state will be described. In FIG. 3, first, the winding 17 is connected to the connecting portion 26a with the V-phase lead wire 25, and further, the transition winding to the winding start side of the insulator 16 at the # 2 position, that is, the connecting wire (hereinafter referred to as the connecting wire). As appropriate, it is drawn out as “crossover 18a”. Thereafter, with respect to the insulator 16 at the position # 2, the winding 17 following the connecting wire 18a is forward-facing in the direction of the arrow Xa on the one side in the axial direction from the winding start side (the front side in FIG. 3). Wind so that For clarity of illustration and easy understanding, the winding 17 wound around the insulator 16 is not shown in FIG. 3 (the same applies hereinafter). As a result, the V-phase coil 5Va at the # 2 position in the V-phase forward direction is formed.

<Winding of coil at # 3 position>
Thereafter, from the winding end side of the winding 17 wound around the insulator 16 at the # 2 position as described above, the winding 17 is connected to the insulator 16 at the # 3 position on the right side, That is, it is pulled out as a crossover (hereinafter referred to as “crossover 18e” as appropriate). Thereafter, the winding wire 17 following the connecting wire 18e is wound with respect to the insulator 16 at the # 3 position on the right side so as to be in the opposite direction to the direction of the arrow Xb opposite to the arrow Xa on one side in the axial direction. Turn. As a result, the V-phase coil 5Vb at the position # 3 in the reverse direction of the V-phase is formed.

<Move to # 9 position>
Thereafter, from the winding end side of the winding 17 wound around the insulator 16 at the position # 3 as described above (on the other side in the axial direction, located on the back side of the paper surface of FIG. 3), the winding 17 is moved in the axial direction. Pull it out to one side. Then, the drawn-out winding 17 is extended along the winding connecting portion 20 of the stator core 4 as an interphase transition winding, that is, a transition wire (hereinafter, referred to as “crossover wire 18b” as appropriate). (However, for convenience of understanding, in FIG. 3, the connecting wire 18 b is not overlapped with the winding connection portion 20, and is illustrated separated radially outward). Specifically, the connecting wire 18b is extended to the insulator 16 at the position # 9, which is radially opposed to the insulator 16 at the position # 3, and then the insulator 16 at the position # 9 and the position # 10 adjacent to the right side thereof. It is connected to the interphase connection part 26b located between the insulators 16.

<Winding of coil at # 9 position>
Thereafter, the winding 17 is pulled out from the interphase connecting portion 26b, and is used as a connecting winding to the winding start side of the insulator 16 at the position # 9, that is, as a connecting wire (hereinafter referred to as a “connecting wire 18c” as appropriate) in the other axial direction. Pull it to the side (back side of the paper in FIG. 3). Thereafter, the winding wire 17 following the connecting wire 18c is wound around the insulator 16 at the position # 9 so as to be in the opposite direction to the direction of the arrow Xb on one axial side from the winding start side. Thereby, the V-phase coil 5Va at the position # 9 in the reverse direction of the V-phase is formed.

<Winding of coil at # 8 position>
Thereafter, from the winding end side of the winding 17 wound around the insulator 16 at the position # 9 as described above, the winding 17 is adjacent to the left side opposite to the right side (in FIG. 3, adjacent to the right side). And is drawn out as a connecting winding to the insulator 16 at position # 8, that is, a connecting wire (hereinafter referred to as a “connecting wire 18f” as appropriate). Thereafter, the winding wire 17 following the connecting wire 18f is wound around the insulator 16 at the # 8 position on the left side so that the forward direction is the direction of the arrow Xa on the other side in the axial direction. As a result, the V-phase coil 5Va in the # 8 position in the V-phase forward direction is formed. The V-phase stator coil 5 (V-phase coils 5Va, 5Va, 5Vb, 5Vb) is thus completed.

<Connection to neutral point>
Thereafter, the winding 17 is axially moved from the winding end side of the winding 17 wound around the insulator 16 at the position # 8 as described above (located on the other side in the axial direction, the back side of the paper surface of FIG. 3). Pull it out to one side. The drawn-out winding 17 is extended along the winding connecting portion 20 of the stator core 4 as a neutral point connecting wire, ie, a connecting wire (hereinafter referred to as connecting wire 18d as appropriate). (However, for convenience of understanding, in FIG. 3, the neutral crossover wire 18 d is not overlapped with the winding connection portion 20 and is illustrated outside the stator core 4). Specifically, the crossover line 18d is connected to the neutral point connecting portion 26c located at the boundary between the insulator 16 at position # 8 and the insulator 16 at position # 7 on the left side.

  At this time, the neutral point connecting portion 26c includes a winding end side of the winding 17 wound around the insulator 16 at the U-phase # 7 position and a winding 17 wound around the insulator 16 at the W-phase # 11 position. Are connected to the end of winding. Therefore, as described above, the winding end side of the winding 17 wound around the insulator 16 at the # 8 position of the V phase is connected to the neutral point connection portion 26c, so that the U phase, the V phase, and the W phase A star connection of three-phase coils is formed.

<Insulation sheet>
In this embodiment, the insulation between the connecting wires 18a to 18f and the stator core 4 is improved on the surface of the winding connecting portion 20 where the connecting wires 18a to 18f are extended as described above. An insulating sheet 21 (insulator) is provided.

  As shown in FIG. 2, the insulating sheet 21 is a thin annular body along the winding connection portion 20 of the stator core 4. That is, the insulating sheet 21 is provided so as to surround the counter-rotor side of the plurality of insulators 16. As shown in FIGS. 4 and 5, the insulating sheet 21 has a plurality (12 in this example) of protrusions provided on the inner peripheral side edge portion in the circumferential direction in the same number as the number of the stator coils 5. A plurality of (in this example, twelve) recesses 23 provided in the number equal to the number of the stator coils 5 along the circumferential direction in the portion 22 and the outer peripheral edge (in other words, the edge on the counter-rotor side). And. The recessed portion 23 is provided at a substantially same circumferential position as the protruding portion 22.

<Projection>
As shown in FIG. 6 and FIG. 2 described above, the protrusion 22 protrudes toward the rotor side (in this example, radially inward) toward the gap 15 between the two adjacent insulators 16 and 16. . As shown in FIG. 7A, the protrusions 22 prevent the connecting wires 18 a to 18 f from deeply entering the gap 15, and generally extend on the insulating sheet 21 along the circumferential direction. Will be established.

<Dent part>
As shown in FIG. 7B and FIG. 2 and FIG. 6 described above, the recessed portion 23 has a shape that is recessed toward the rotor side (inner side in the radial direction). In this embodiment, although omitted in FIG. 1 to FIG. 6 and FIG. 7A for avoiding the complexity of illustration, in fact, as shown in FIG. The part extended along the insulating sheet 21 among the crossover wires 18a to 18f and the insulating sheet 21 are bound by an insulating string 27 (binding member). That is, the recess 23 also serves as a guide function for allowing the string 27 to enter.

<Effect of embodiment>
As described above, in the rotating electrical machine 1 of the present embodiment, the plurality of insulators 16 are arranged in the circumferential direction in the stator core 4, and the winding 17 is wound around each insulator 16. At this time, at least a part of the connecting wires 18 a to 18 f for connecting the windings 17 (in other words, the stator coil 5) of the insulators 16 or connecting the stator coils 5, 5 to each other is the stator core 4. It is extended along the axial direction one side edge part. In the present embodiment, an insulating sheet 21 is provided at one end portion in the axial direction of the stator core 4, and the connecting wires 18 a to 18 f and the stator core 4 are extended by the insulating sheet 21 as described above. Insulation between is ensured.

  And especially in this embodiment, the insulating sheet 21 provided so that the radial direction outer side of the some insulator 16 may be enclosed is provided with the protrusion part 22 to radial direction inner side. The protrusion 22 protrudes radially inward toward the gap 15 between the two insulators 16 and 16 adjacent to each other among the plurality of insulators 16 arranged in the circumferential direction as described above. As a result, even when the connecting wires 18a to 18f extending along one axial end of the stator core 4 as described above try to enter the gap by mistake, as shown in FIG. Further, the protrusion 22 can be interposed between the stator core 4 and the crossover wires 18a to 18f to suppress entry. As a result, it is possible to prevent the connecting wires 18a to 18f from penetrating deeply into the gap 15 (see the two-dot chain line) and contacting (or approaching) the stator core 4 at the contact point P to lower the insulation. it can.

  Further, in the present embodiment, in particular, the insulating sheet 21 is provided with a recessed portion 23 having a shape recessed toward the rotor side at the edge on the counter-rotor side which is substantially the same circumferential position as the protruding portion 22. Accordingly, as shown in FIG. 7B, when the plurality of crossover wires 18 a to 18 f extending along one axial side of the insulating sheet 21 are bundled together with the insulating sheet 21, the concave portion 23. By binding at this position, inadvertent misalignment is less likely to occur, and stable tying can be achieved.

  In the present embodiment, in particular, the plurality of crossover wires 18 a to 18 f extending along one axial direction of the insulating sheet 21 are bundled together with the insulating sheet 21 by the string 27 at the position of the recessed portion 23. . At that time, the string 27 is bound while entering the recess 23. Thereby, it is possible to reliably prevent the outer diameter of the combined product obtained by binding the plurality of connecting wires 18a to 18f together with the insulating sheet 21 from increasing in diameter by the outer diameter of the string 27 at the position of the string 27. it can.

<Modification>
The disclosed embodiments are not limited to the above, and various modifications can be made without departing from the spirit and technical idea thereof.

  For example, as shown in FIG. 9 corresponding to FIG. 8, a protrusion 22 ′ longer than the protrusion 22 of the embodiment may be provided. The protruding portion 22 ′ extends radially inward (in other words, the rotor side) from the insulating sheet 21 and protrudes into the gap 15 between the two adjacent insulators 16 and 16. Further, the distal end side of the protruding portion 22 ′ is bent while changing its direction like a bowl in the gap 15, and extends to the other axial side of the stator core 4 (lower side in FIG. 9).

  Thereby, protrusion part 22 'can be reached deeply of the space | gap 15 between the said two insulators 16 and 16. As shown in FIG. As a result, it is possible to further reliably suppress the above-described jumper wires 18a to 18f from entering the gap 15 and further improve the insulation.

  In the above description, the case where the rotating electrical machine 1 is an inner rotor type in which the rotor 2 is provided inside the stator 3 has been described as an example, but an outer rotor type rotation in which the rotor is provided outside the stator. It can also be applied to electric machines. In that case, the insulating sheet 20 is provided so as to surround the radially inner side (counter-rotor side) of the plurality of insulators 16, and the protruding portion 22 of the insulating sheet 20 faces the gap between the two adjacent insulators 16. Projecting radially outward (rotor side). Furthermore, although the case where the rotating electrical machine 1 is an electric motor has been described as an example, the present invention can also be applied to the case where the rotating electrical machine 1 is a generator.

  In addition to those already described above, the methods according to the embodiment and the modified examples may be used in appropriate combination.

  In addition, although not illustrated one by one, the above-described embodiments and modifications are implemented with various modifications without departing from the spirit thereof.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 2 Rotor 3 Stator 4 Stator core 8 Rotating shaft 15 Air gap 16 Insulator 17 Winding 18a-f Crossover wire 20 Winding extension part 21 Insulating sheet (insulator)
22 Protruding part 22 'Protruding part 23 Recessed part 27 String (binding member)

Claims (4)

A plurality of insulators wound with windings are arranged in the circumferential direction, a stator having a stator core, and
A rotor provided on the radially inner side or the outer side of the stator and provided with a rotation shaft;
An insulating sheet provided at one end of the stator core in the axial direction so as to surround the radially outer side or the inner side which is the anti-rotor side of the plurality of insulators;
Have
The insulating sheet is
A substantially annular ring portion located on the radially outer side or on the inner side of the plurality of insulators on the side opposite to the rotor,
Toward the gap between the two of said insulator adjacent from said annular portion, provided so as to protrude radially inwardly or outwardly as the said rotor side, and a plurality of protrusions,
Rotating electric machine, characterized in that it comprises integrally a. The protrusion is
After projecting inward or outward in the radial direction on the rotor side toward the gap from the annular part, the direction is changed and the bent part is arranged to extend to the other side in the axial direction. The rotating electrical machine according to claim 1, wherein The insulating sheet is
Provided with a recessed portion having a shape recessed toward the inner side or the outer side in the radial direction on the rotor side, on the radially outer side or the inner edge on the counter-rotor side which is substantially the same circumferential position as the protruding portion. The rotating electrical machine according to claim 1, wherein the rotating electric machine is characterized. Wherein the plurality of windings which extends along the axial direction one side of the insulating sheet, tying together with the insulating sheet at the location of the recess, according to claim 3, wherein a binding member Rotating electric machine.

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