JP5911712B2 - Rotating electric machine stator, rotating electric machine, and automobile - Google Patents

Description

Embodiments described herein relate generally to a rotating electrical machine stator , a rotating electrical machine including the stator, and an automobile including the rotating electrical machine.

  Conventionally, a concentrated winding type rotating electrical machine is mounted as a drive motor in a vehicle such as an electric vehicle or a hybrid vehicle. This rotating electrical machine includes, for example, a permanent magnet in a rotor core, and one phase of windings forming three phases of U phase, V phase, and W phase for each tooth disposed on the inner peripheral portion of the stator core. An inverter driving system is known that is wound by concentrated winding.

  In this type of rotating electrical machine, a sheet-like insulating material is inserted between the windings, that is, between the U phase and the V phase, between the V phase and the W phase, and between the W phase and the U phase so that the windings do not contact each other. However, the insulating material assembled between the windings may be displaced from a predetermined position due to vibration of the rotating electrical machine or the like, and may damage the coating of the windings. In particular, when a rotor and a stator are incorporated in a housing and a permanent magnet of the rotor is magnetized using the stator winding as a magnetizing winding, a large magnetizing current flows through each winding. As a result, as the windings of each phase in the stator vibrate, the insulating material may come off between the windings, and the adjacent windings may come into contact with each other to cause a dielectric breakdown.

JP 2002-112488 A JP 2005-133585 A JP 2011-72128 A

Therefore, a stator of a rotating electrical machine, a rotating electrical machine, and an automobile that can securely fix an interphase insulating sheet and reliably insulate between windings are provided.

The stator of the rotating electrical machine according to the present embodiment includes a stator core, a plurality of windings wound in a concentrated winding around the stator core, and an interphase insulating sheet inserted between the plurality of windings. And
The interphase insulating sheet includes a pair of parallel fold lines and is constituted by the central fold line and said pair of parallel fold lines which are parallel to the said central fold lines at positions sandwiching the both sides of one central fold line that will be formed in the center In a state in which the center folding line is folded by three folding lines for folding in such a manner that the direction folded back and the direction folded by the central folding line are alternated, the central folding line is oriented in the axial direction of the stator core. The sheet main body inserted between the plurality of windings and the edge fold line extending in a direction orthogonal to the central fold line are continuously provided to be folded at both ends of the sheet main body in the direction of the central fold line, obtain Bei and said sheet said plurality of windings folded portions which are fitted between the plurality of windings each other by insertion between each other body.

The schematic diagram which abbreviate | omits a coil | winding part about the state which fitted the interphase insulation sheet of 1st Embodiment in the stator core. Appearance perspective view from the inner peripheral side of the stator core shown with the winding wound by concentrated winding View of the interphase insulation sheet assembled between the windings as seen from the axial direction of the stator core Development of phase insulation sheet Cross section of W-shaped interphase insulating sheet Functional block diagram schematically showing the configuration of an electric vehicle FIG. 1 is a diagram corresponding to FIG. 1 with the stator omitted for the second embodiment. FIG. 1 equivalent diagram showing the third embodiment FIG. 7 equivalent view showing the fourth embodiment

<First Embodiment>
Hereinafter, a first embodiment applied to a drive motor used in an electric vehicle and driven by an inverter will be described with reference to FIGS. FIG. 6 shows an electric vehicle equipped with the drive motor 1 as a rotating electric machine.

  As shown in FIGS. 1 and 2, the stator 2 of the drive motor 1 includes a substantially cylindrical stator core 3 formed by laminating a large number of annular magnetic steel plates. The stator core 3 integrally includes a cylindrical yoke 3b and a plurality of (for example, 24) teeth 3a provided at equal intervals in the circumferential direction on the inner peripheral portion of the yoke 3b. Each tooth 3a is formed in a quadrangular prism shape so as to protrude from the inner peripheral surface of the yoke 3b toward the center, and the space between the teeth 3a in the inner peripheral portion of the stator core 3 is a slot 6. (See FIG. 3). As will be described in detail later, the teeth 3a are provided with a three-phase (U-phase, V-phase, W-phase) winding 5 (U-phase winding 5u, V-phase winding 5v, W-phase winding) via an insulating spool 4. The wire 5w) is wound by the concentrated winding method.

  Although not shown in the drawings, the rotor of the drive motor 1 includes a substantially cylindrical rotor core formed by laminating a large number of annular magnetic steel plates, and a rotating shaft that penetrates the rotor core in the stacking direction of the magnetic steel plates. And a permanent magnet inserted into a magnet insertion hole formed in the outer peripheral portion of the rotor core. The rotor is disposed in the field space of the stator 2 with a slight gap (air gap) between the outer peripheral surface thereof and the inner peripheral surface of the stator 2, and is rotatable with respect to the stator 2. It has become.

  The insulating spool 4 is made of an electrically insulating resin material, and a body portion 4a around which the winding 5 is wound and a flange portion 4b formed on one end side of the body portion 4a are integrally formed by resin molding. Have. Here, FIG. 3 shows a state in which the U-phase winding 5u and the V-phase winding 5v are wound around a pair of insulating spools 4 adjacent in the circumferential direction. The V-phase winding 5v, the U-phase winding 5u, and the W-phase winding 5w have the same configuration.

  As shown in FIGS. 2 and 3, the body portion 4a has a rectangular tube shape, the flange portion 4b has a rectangular frame shape, and the insulating spool 4 has a fitting hole 7 extending in the axial direction of the body portion 4a. Is formed. The insulating spool 4 is attached to the stator core 3 (hereinafter simply referred to as the iron core 3) with the teeth 3 a inserted through the fitting holes 7. The flange portion 4b of the insulating spool 4 is integrally provided with a pair of extending pieces 4c (only one extending piece 4c is shown in FIG. 3) projecting from the opposite side to the body portion 4a. The pair of extending pieces 4c are formed at positions where the iron core 3 is sandwiched from both sides in the axial direction in the flange portion 4b, and both end faces 3c, 3d (3d) in the axial direction of the iron core 3 with the insulating spool 4 mounted on the iron core 3. (See FIG. 1).

  The winding 5 is, for example, a copper wire provided with an insulating coating, and is wound around the trunk portion 4 a of the insulating spool 4 by a predetermined number of turns. In this case, the U-phase winding 5u, the V-phase winding 5v, and the W-phase winding 5w are concentrated windings wound by one phase for each insulating spool 4. Each winding 5 is wound around the trunk 4a so as to form a square tube as a whole. As a method of connecting the winding 5, for example, a bus ring disclosed in Japanese Patent Application No. 2008-281383 filed by the applicant of the present application is used, or a star connection is formed by using a crossover or the like connecting the winding 5. However, detailed description is omitted.

  When the winding 5 is wound by the concentrated winding method as described above, as shown in FIG. 3, in the slot 6 of the iron core 3, the windings 5 having different phases (in the figure, the U-phase winding 5u and V The phase windings 5v) are located next to each other. Therefore, interphase insulating paper 9 is inserted between the windings 5 in the iron core 3, that is, between the U phase and the V phase, between the V phase and the W phase, and between the W phase and the U phase. The interphase insulating paper 9 will be described in detail with reference to FIGS. The interphase insulating paper 9 is attached to the iron core 3 in a folded state, which will be described later. FIG. 4 shows the expanded state before the interphase insulating paper 9 is folded, and the specific dimension value (unit) is shown in parentheses. : Mm).

  For the interphase insulating paper 9, for example, Nomex (registered trademark) having a thickness of 0.18 mm is used as a sheet material having electrical insulation characteristics. As shown in FIG. 4, the interphase insulating paper 9 has a substantially rectangular shape when viewed from the thickness direction, and is formed such that a pair of projecting pieces 12u and 12d project from left and right sides 10a and 10b, respectively. The dimension H in the vertical direction of the interphase insulating paper 9 is larger than the axial dimension L0 in the stacking direction of the iron cores 3 (H> L0, see FIG. 1), and the outer dimension L1 of the winding 5 in the axial direction of the iron core 3 (see FIG. 2)) or larger (H ≧ L1). Also. The dimension H in the vertical direction of the interphase insulating paper 9 is set slightly larger than the dimension W in the horizontal direction.

  A central folding line 13 extending in the longitudinal direction (longitudinal direction) is formed at the center in the width direction (lateral direction) of the interphase insulating paper 9. A pair of parallel fold lines 14 a and 14 b parallel to the central fold line 13 are formed at positions sandwiching the central fold line 13. One parallel folding line 14 a is formed at a position intermediate between the left side 10 a and the central folding line 13 so as to bisect the left half of the interphase insulating paper 9, and the other parallel folding line 14 b is formed on the right half of the interphase insulating paper 9. It is formed at an intermediate position between the right side 10b and the central folding line 13 so as to divide the portion into two.

  The central fold line 13 and the parallel fold lines 14a and 14b constitute three fold lines for four folds that are parallel to the left and right sides 10a and 10b and are equally spaced in the width direction. That is, the interphase insulating paper 9 is divided into four areas of a first area 21, a second area 22, a third area 23, and a fourth area 24 by these three broken lines 13, 14 a, 14 b. As will be described in detail later, the width dimension (for example, 17 mm) of each region 21 to 24 is the dimension L2 in the radial direction of the iron core 3 of the winding 5 (see FIG. 3) or the workability of assembling the interphase insulating paper 9. Set in consideration.

  The pair of protruding pieces 12u and 12d provided in the left and right regions 21 and 24 of the interphase insulating paper 9 are spaced apart from each other by the axial dimension L0 of the iron core 3 on each side 10a and 10b. It is set as the structure engaged so that it may pinch | interpose to a direction (refer FIG. 1, FIG. 4). Specifically, the protruding piece 12u is provided at the upper corner of the interphase insulating paper 9, and the protruding piece 12d is provided at the lower corner of the interphase insulating paper 9, and laterally (laterally) from each side 10a, 10b. The protrusion dimension of is set to 3 mm, for example. The distance between the protruding pieces 12u and 12d on each side 10a and 10b is set to 51 mm, which is slightly larger than the axial dimension L0 of the iron core 3, for example. In other words, the left and right edges of the interphase insulating paper 9 are grasped as having the concave notch 15 that is notched so that the iron core 3 is fitted between the protruding pieces 12u and 12d.

  In the periphery of the interphase insulating paper 9, the vicinity of the pair of sides 11a and 11b orthogonal to the central folding line 13 is a folded region (folded portions 16a and 16b). That is, the interphase insulating paper 9 is formed with an edge fold line 17a extending in parallel with the side 11a at a position inside a predetermined distance (for example, 7 mm) from the upper side 11a and at a position within a predetermined distance (for example, 7 mm) from the lower side 11b. An edge fold line 17b extending in parallel with the side 11b is formed at the position. As described above, the edge fold lines 17a and 17b are arranged at the intermediate portions in the vertical direction of the protruding pieces 12u and 12d.

  Thus, areas outside the edge folding lines 17a and 17b in the interphase insulating paper 9 are divided as folding areas, respectively, and are folded back so that the protruding pieces 12u and 12d are doubled by the edge folding lines 17a and 17b. , 16b. Here, the portion of the interphase insulating paper 9 excluding the folded portions 16a and 16b is a sheet main body 20, and the folded portions 16a and 16b are continuously arranged so as to be folded at both end portions of the sheet main body 20. . In addition, the folding | returning parts 16a and 16b should just be provided in at least one of the sheet | seat main body 20 and the folding | turning parts 16a and 16b.

  As for the folding lines 13, 14a, 14b, 17a, and 17b described above, a mountain fold line that is folded back so that the front side is convex toward the plane of FIG. 4 is indicated by a broken line, and two valley fold lines that are folded so as to be concave are shown. It is indicated by a dotted line. That is, the edge fold lines 17 a and 17 b are valley-folded so as to be concave on the first surface 18 E among the both surfaces 18 E and 18 I of the interphase insulating paper 9. The center fold line 13 is divided into three line segments (first line segment 131 to third line segment 133) by edge fold lines 17a and 17b, the second line segment 132 is valley-folded, and the other first line segments 131 are separated. And the third line segment 133 is folded into a mountain fold. Each parallel folding line 14a and 14b is divided into three line segments (first line segment 141a to third line segment 143a and first line segment 141b to third line segment 143b) by edge fold lines 17a and 17b, respectively. The two line segments 142a and 142b are folded in a mountain fold, and the other first line segments 141a and 141b and the third line segments 143a and 143b are folded in a valley fold.

  The interphase insulating paper 9 according to the present embodiment is formed symmetrically with respect to one central fold line 13 including the protruding pieces 12u and 12d, and has a vertically symmetric shape, and the fold lines 13, 14a, 14b, and 17a described above. , 17b are also arranged symmetrically left and right and vertically. The center fold line 13 and the parallel fold lines 14a and 14b are formed at equal intervals in the width direction of the interphase insulating paper 9 as described above. For this reason, the interphase insulating paper 9 is folded in a zigzag manner by so-called bellows folds by the central fold line 13 and the parallel fold lines 14a and 14b, so that the dimension W in the width direction excluding the protruding pieces 12u and 12d is 1/4. Thus, bending strength and torsional strength (rigidity) are added. Further, at both end portions in the longitudinal direction of the interphase insulating paper 9, the folded portions 16a and 16b are folded over the first region 21 to the fourth region 24. As a result, the number of the folded portions 16a and 16b becomes eight, so that the rigidity is further improved.

  In the folded state, among the four regions 21 to 24 of the interphase insulating paper 9 folded, the first surface 21E of the first region 21 and the fourth region 24 is the outside, and the second surface 18I is the inside. (See FIGS. 1 and 5). The folded portions 16 a and 16 b are folded to the first surface 18 E side of the interphase insulating paper 9 and are located outside the sheet main body 20. FIG. 5 shows a state in which the folded interphase insulating paper 9 is expanded so that the entire insulating paper 9 has a W shape by its own restoring force. In the following, in the interphase insulating paper 9, a ridge line formed by folding at the central fold line 13 is referred to as a central ridge line 13 ', and a ridge line formed by folding at the parallel fold lines 14a and 14b is defined as two ridge lines 14a' and 14b '. Called.

  Next, a procedure for folding the interphase insulating paper 9 will be described. It is assumed that all the fold lines 13, 14a, 14b, 17a, and 17b described above are attached to one side 18I of the interphase insulating paper 9 by printing or the like in advance. The bent lines 13, 14a, 14b, 17a, and 17b may be formed by machining.

  The interphase insulating paper 9 is brought into the folded state as follows. That is, the upper and lower edge fold lines 17a and 17b are valley-folded, and the folded portions 16a and 16b are folded back toward the front side (first surface 18E). In the central folding line 13, the second line segment 132 is valley-folded (according to this, the other line segments 131, 133 are folded in a mountain), and the interphase insulating paper 9 is folded in half. As for each parallel folding line 14a, 14b, the 2nd line segment 142a, 142b was each mountain-folded (with this, the other line segments 141a, 141b, 143a, 143b were valley-folded), and the interphase insulating paper 9 was folded in four It becomes a state. Thereby, in the interphase insulating paper 9, the sheet body 20 is folded by so-called bellows folds in which the direction folded by the parallel folding lines 14a and 14b and the direction folded by the central folding line 13 are alternate, and the folded portions 16a and 16b are It will be in the state which overlaps by the 1st surface 18E side used as the outer side of the sheet | seat main body 20. FIG. Note that the folding order is not limited to this, and the central folding line 13 and the parallel folding lines 14a, 14b may be appropriately changed, such as folding in a zigzag order from the one end side to the other end side in the folding lines 14a, 13, 14b. .

Next, the operation of the above configuration will be described.
The U-phase winding 5u, the V-phase winding 5v, and the W-phase winding 5w are wound in advance by one phase for each insulating spool 4, and each insulating spool 4 is attached to each tooth 3a of the iron core 3 from the inner peripheral side. To do. In this case, the insulating spool 4 has the fitting hole 7 fitted into the tooth 3a, and the extended piece 4c of the flange portion 4b is engaged with both axial end faces 3c, 3d of the iron core 3. (See FIGS. 2 and 3). In this case, the windings 5 adjacent to each other in the circumferential direction are arranged in the slots 6 of the iron core 3 in a state of being close to each other.

  Therefore, by inserting the interphase insulating paper 9 folded as described above between the windings 5, it is possible to reliably insulate the windings 5. That is, the operator holds, for example, end portions (folded portions 16a and 16b) of the folded interphase insulating paper 9 and holds the protruding pieces 12u and 12d at both ends of the winding 5 in the axial direction of the iron core 3. It is inserted from the inner peripheral side of the iron core 3 so as to be aligned with the corners 5c located on the upper and lower sides of the winding 5 in FIG. In this case, the interphase insulating paper 9 is folded so that the side edges 10a, 10b provided with the projecting pieces 12u, 12d and the central ridge line 13 'are aligned in a straight line, so that the inserting operation into the slot 6 is smooth. To be done.

  As shown in FIGS. 1 and 3, the interphase insulating paper 9 is projected to the position where the side edges 10 a and 10 b aligned with the central ridge line 13 ′ are in contact with the inner peripheral surface of the yoke 3 b, 12d engages so that the axial direction both end surfaces 3c and 3d of the iron core 3 may be pinched | interposed. Thereby, even if an operator removes his / her hand from the interphase insulating paper 9, the fall is prevented, and the central folding line 13 is inserted between the windings 5 in a direction oriented in the axial direction of the iron core 3. In addition, the interphase insulating paper 9 between the windings 5 expands so that the entire insulating paper 9 forms a W shape when viewed from the axial direction of the iron core 3 by its own restoring force. 18E presses against the winding 5 on both sides in the circumferential direction. That is, the interphase insulating paper 9 spreads between the windings 5 so that both side edges 10a and 10b are separated from each other on the bottom side of the slot 6 (see arrow D1 in FIG. 5). Since the ridge lines 14a ′ and 14b ′ expand so as to be separated from each other (see arrow D2), as shown in FIG. 3, the contact area of the outer surface 18E with the side portion of the winding 5 becomes as large as possible. Further, both end portions in the longitudinal direction of the interphase insulating paper 9 are folded in multiple by the folded portions 16a and 16b, and a sufficient thickness is secured. Therefore, even when the gap between the windings 5 into which the interphase insulating paper 9 is inserted is relatively large, the folded portions 16a and 16b are expanded at the corners 5c located on both the upper and lower sides of the winding 5 in FIG. And is locked. Thereby, the position of the interphase insulating paper 9 as a whole is not shifted. In addition, as shown in FIG. 1, the windings are made with the edges of the folded portions 16 a and 16 b, that is, the upper and lower sides 11 a and 11 b of the interphase insulating paper 9 facing each other in the axial direction of the iron core 3 outside the insulating paper 9. 5, it is possible to obtain a high retaining effect of the interphase insulating paper 9 with respect to the winding 5. Therefore, since the interphase insulating paper 9 needs to be inserted only once, the work efficiency is improved.

  The stator 2 having the winding 5 wound around the iron core 3 is molded with an insulating resin (not shown) together with the interphase insulating paper 9. Thereby, the winding 5 in the iron core 3 is buried and fixed together with the interphase insulating paper 9 with the resin, and insulation is ensured.

  By the way, in a drive motor used for an electric vehicle or the like, there is a tendency to set the space factor of the winding higher in order to obtain a small size and high output, and when the interphase insulating paper 9 is folded as described above, It is also assumed that the gap between the windings 5 is narrow and difficult to insert. Therefore, the inventors conducted the following experiment by paying attention to the relationship between the central folding line 13 inserted first between the windings 5 in the interphase insulating paper 9 and the side edges 10a and 10b. First, for three sheets of interphase insulating paper (hereinafter referred to as interphase insulating paper 9A, 9B, 9C), the width dimensions w1, w2, w3, w4 of the first region 21 to the fourth region 24 (see FIG. 4). Is set as follows.

In the interphase insulating paper 9A, the widths w1 to w4 of the regions 21 to 24 are all set to 16 mm (w1 = w2 = w3 = w4 = 16 mm).
In the interphase insulating paper 9B, the width dimensions w1 and w4 of the first area 21 and the fourth area 24 are set to 16 mm (w1 = w4 = 16 mm), and the dimensions of the other areas 22 and 23 are respectively set to 12 mm (w2 = w3). = 12 mm).

  In the interphase insulating paper 9C, the width dimensions w1 and w4 of the first area 21 and the fourth area 24 are set to 16 mm (w1 = w4 = 16 mm), and the dimensions of the other areas 22 and 23 are respectively set to 14 mm (w2 = w3). = 14 mm).

  Here, the dimensions other than the width dimensions w1 to w4 (W) in the interphase insulating papers 9A, 9B, and 9C are the same as the dimensions of the interphase insulating paper 9 shown in FIG. Further, the space factor of the winding is set high, and the gap between the windings 5 is narrow so that contact between the interphase insulating papers 9A, 9B, 9C and the winding 5 is unavoidable when manually inserted. It shall be Then, for each of the interphase insulating papers 9A, 9B, 9C, the protruding pieces 12u, 12d are directed toward the slot 6 and the windings 5 from the side 10a, 10b side, in the same manner as the inserting method of the interphase insulating paper 9 described above. Insert between.

  According to experiments conducted by the inventors under this condition, the interphase insulating paper 9A can be inserted between the windings 5 relatively easily, whereas the interphase insulating paper 9B and 9C are difficult to insert between the windings 5. became. Although illustration is omitted, in the state where the interphase insulating papers 9B and 9C are folded, the central ridge line 13 'is accommodated inside the side edges 10a and 10b of the insulating papers 9B and 9C. For this reason, when inserting the interphase insulating paper 9B, 9C between the windings 5, it is considered that the side 10a, 10b portion to be inserted first bends in contact with the winding and becomes difficult to insert. Further, since the interphase insulating papers 9B and 9C themselves are relatively thin, they are likely to buckle when caught with the winding 5. On the other hand, in the state in which the interphase insulating paper 9A is folded, the central ridge line 13 'and the side edges 10a and 10b are aligned, and the edges are quadruple and the rigidity is increased, so that buckling is unlikely to occur. It is thought that it becomes easy to do.

  Since the central ridge line 13 'is folded back so as to be convex as the insertion side between the windings 5, it is less likely to be caught by the windings and increases the rigidity as compared to the side edges 10a and 10b. Yes. Although not shown, in the interphase insulating paper, one parallel folding line 14a is formed at a position closer to one side 10a than the central folding line 13, and the other parallel folding line 14b is the other side of the central folding line 13. It is formed at a position close to 10b (w2> w1, w3> w4). Thereby, in the state which interphase insulating paper was folded, it can insert easily from center ridgeline 13 'by comprising so that center ridgeline 13' may protrude as an outer side (insertion side) from side 10a, 10b.

  FIG. 6 is a functional block diagram schematically showing the configuration of an electric vehicle equipped with a system for driving the motor 1 for driving and driving the motor 1. Reference numeral 100 denotes an automobile chassis (body), and one or more assembled batteries (not shown) are incorporated in the assembled battery pack 200. The positive and negative electrodes of the battery pack 200 are connected to a voltage conversion and operation control unit 300 that includes an inverter device and converts a voltage and receives an operation command to perform level control and phase control of output current / voltage. Yes. The output of the voltage conversion and operation control unit 300 is supplied to the drive motor 1 as drive power.

  The vehicle body 100 is provided with wheels WR and WL which are left and right driving wheels. The wheels WR and WL are configured to be drivable by a driving force output from the drive motor 1, and the rotation of the drive motor 1 is transmitted to the wheels WR and WL via, for example, a differential gear unit. The battery management board 400 is mounted with a circuit (including a control unit, a communication interface, a storage unit, etc.) for managing the state of the assembled battery and performing communication.

  As described above, the insulating paper 9 as the interphase insulating sheet has a substantially rectangular shape, and a pair of parallel folding lines parallel to the central folding line 13 formed at the center and the central folding line 13 formed between the both sides of the central folding line 13. 14a and 14b, and three folding lines 13, 14a and 14b for four folding folded back so that the direction folded at the central folding line 13 and the direction folded at the pair of parallel folding lines 14a and 14b are alternated; Edge fold lines that are formed along a pair of sides 11a and 11b orthogonal to the central folding line 13 in the periphery of the interphase insulating paper 9, and divide the folded portions 16a and 16b on the pair of sides 11a and 11b side of the interphase insulating paper 9. 17a, 17b.

  The interphase insulating paper 9 having the above configuration is formed with folded portions 16a and 16b by edge folding lines 17a and 17b at both ends thereof, and is folded by so-called bellows folding by the three folding lines 13, 14a and 14b. In this state, the interphase insulating paper 9 is folded and inserted between the windings 5 of the stator 2 from, for example, the center ridge line 13 ′ (sides 11 a and 11 b). As a result, the interphase insulating paper 9 between the windings 5 spreads out by its own restoring force so that the entire insulating paper 9 forms a W shape when viewed from the axial direction of the iron core 3, and the regions 21 and 24 on both sides thereof are spread. The surface 18E presses against the winding 5. Therefore, the interphase insulating paper 9 spreads between the windings 5 on the radially inner side and the radially outer side of the iron core 3 (see arrows D1 and D2 in FIG. 5), and therefore the contact area of the outer surface 18E with the side surface side of the winding 5 Can be made as large as possible, and a configuration suitable for assembly between the windings 5 can be obtained regardless of the size of the gap between the windings 5. Further, according to the above configuration, the folded portions 16a and 16b are formed at the edge fold lines 17a and 17b and folded by the bellows fold, so that both end portions of the interphase insulating paper 9 are folded in multiple layers, so that sufficient thickness and rigidity are achieved. Can be secured. Therefore, for example, the interphase insulating paper 9 inserted as described above is locked by fitting the folded portions 16 a and 16 b at both ends so as to expand between the windings 5. For this reason, in the manufacturing process of the stator 2, it can prevent reliably that the position of the interphase insulating paper 9 inserted between the windings 5 shifts or falls off. Therefore, it is possible to eliminate insulation abnormality due to contact between the windings 5 or the like.

  The stator 2 includes an iron core 3, a plurality of windings 5 wound around the iron core 3 by concentrated winding, and the interphase insulating paper 9. According to this, since the winding 5 is wound by concentrated winding one phase at a time, unlike the distributed winding wound across a plurality of teeth, the space factor of the winding 5 is increased and the winding 5 is reduced in size. High output. Therefore, the drive motor 1 including the stator 2 and the rotor disposed in the field space can be configured to be suitable for a vehicle such as an electric vehicle. In addition, similarly to the above configuration, it is possible to manufacture a high-quality drive motor 1 that does not have an insulation abnormality due to contact between the windings 5 or the like.

  Further, in the stator 2, the interphase insulating paper 9 is folded between the three folding lines 13, 14 a, 14 b, and the plurality of windings 5 are arranged so that the central folding line 13 is oriented in the axial direction of the iron core 3. The sheet main body 20 is connected to the both ends of the sheet main body 20 in the direction of the central folding line 13 via the sheet main body 20 inserted therebetween and the edge folding lines 17a and 17b extending in a direction orthogonal to the central folding line 13. 20 is provided with folded portions 16a, 16b fitted between the plurality of windings 5 by being inserted between the plurality of windings 5.

  That is, as described in the second embodiment, the direction in which the interphase insulating paper 9 is inserted between the windings 5 may be any direction in which the central folding line 13 is oriented in the axial direction of the iron core 3. In the stator 2 provided with the interphase insulating paper 9 in this direction, since the folded portions 16a and 16b are fitted between the windings 5, the interphase insulating paper 9 is prevented from being displaced between the windings 5 more reliably. be able to. In addition, the same effects as those of the interphase insulating paper 9 are obtained.

  The pair of protruding pieces 12u and 12d are provided on at least one of the sheet body 20 and the folded portions 16a and 16b of the interphase insulating paper 9, and are configured to engage so as to sandwich the iron core 3 in the axial direction. According to this, the interphase insulating paper 9 is folded as described above, and the projecting pieces 12u and 12d are inserted between the windings 5 so that the projecting pieces 12u and 12d cause the axially opposite ends 3c and 3d of the iron core 3. Engage so that Thereby, in the manufacturing process of the stator 2, it can prevent more reliably that the position of the interphase insulating paper 9 inserted between the windings 5 shifts or falls off. More specifically, the interphase insulating paper 9 has a substantially rectangular shape in the unfolded state, and the dimensions of the sides 10 a and 10 b parallel to the central folding line 13 are set larger than the axial dimension L 0 of the iron core 3. A pair of projecting pieces 12u and 12d projecting from a pair of sides 10a and 10b parallel to the central folding line 13, respectively, are separated from each other by an axial dimension L0 of the iron core 3. A pair of projecting pieces 12u and 12d that are engaged so as to be sandwiched in the direction are provided. This configuration also provides the same effects as the protruding pieces 12u and 12d.

  The folded portions 16a and 16b are located outside the four-fold sheet body 20 so as to face the winding 5 between the plurality of windings 5. That is, the interphase insulating paper 9 is configured to be folded in two or four so that the folded portions 16a and 16b folded at the edge fold lines 17a and 17b are on the outside. According to this, the edges of the folded portions 16 a and 16 b, that is, the pair of sides 11 a and 11 b of the interphase insulating paper 9 are in contact with the winding 5 in a state of facing each other in the axial direction of the iron core 3 outside the insulating paper 9. Therefore, a high retaining effect of the interphase insulating paper 9 with respect to the winding 5 can be obtained.

  The interphase insulating paper 9 has a substantially rectangular shape in the unfolded state, and the pair of parallel folding lines 14a and 14b has one parallel folding line 14a that is parallel to the central folding line 13 in the periphery of the interphase insulating paper 9. 10a and the central folding line 13 are formed in the middle position or at a position closer to one side 10a than the central folding line 13, and the other parallel folding line 14b is parallel to the central folding line 13 in the periphery of the interphase insulating paper 9. Is formed at a position intermediate between the other side 10b and the central folding line 13 or at a position closer to the other side 10b than the central folding line 13, and the interphase insulating paper 9 is disposed between the plurality of windings 5. The sheet body 10 is inserted from the side of the central ridge line 13 ′ formed by folding the sheet body 10 along the central fold line 13.

  According to this, in the state in which the interphase insulating paper 9 is folded, the side edges 10a and 10b do not protrude beyond the central ridgeline 13 '. Therefore, when the interphase insulating paper 9 is inserted between the windings 5, the central ridge line 13 ′ can be pushed in until it comes into contact with the inner peripheral surface of the iron core 3 and can be used for positioning in the radial direction with respect to the iron core 3. In the interphase insulating paper 9, one parallel fold line 14a is formed at an intermediate position between one side 10a and the center fold line 13 (w1 = w2), and the other parallel fold line 14b is When it is formed at an intermediate position between the side 10b and the central folding line 13 (w3 = w4), by folding as described above, the central ridge line 13 'and the side edges 10a, 10b are aligned and quadrupled. Buckling is less likely to occur, and the interphase insulating paper 9 can be assembled smoothly. Further, in the interphase insulating paper, one parallel folding line 14a is formed at a position closer to one side 10a than the central folding line 13 (w2> w1), and the other parallel folding line 14b is arranged on the other side 10b from the central folding line 13. When the insulating paper is formed at a position close to the center (w3> w4), the central ridge line 13 'protrudes outward (sideward) from the side edges 10a and 10b in a state where the insulating paper is folded. Since the center ridge line 13 ′ is folded back so as to be convex as the insertion side between the windings 5, it is less likely to be caught by the windings and the rigidity can be increased compared to the side edges 10 a and 10 b. Insulating paper can be easily inserted from the central ridgeline 13 '.

<Other embodiments>
7 to 9 show the second to fourth embodiments. The same parts as those already described are denoted by the same reference numerals, description thereof is omitted, and different points will be described below.

  The interphase insulating paper 30 of the second embodiment shown in FIG. 7 is different from the interphase insulating paper 9 of the first embodiment in that the protruding pieces 12u and 12d are omitted. The interphase insulating paper 30 is folded in the same manner as the interphase insulating paper 9, and the center ridge line 13 ′ is inserted between the windings 5 with the outer side in the radial direction of the iron core 3. The interphase insulating paper 30 does not directly engage with the iron core 3 because there are no protruding pieces 12u and 12d, but, like the interphase insulating paper 9, the insulating paper 30 as a whole has a W shape by its own restoring force. spread. Further, both end portions in the longitudinal direction of the interphase insulating paper 9 are folded in multiples by the folded portions 16a and 16b, and the first folded portions 16a and 16b are in contact with the winding 5 in a state where the folded portions 16a and 16b face each other. Similar to the embodiment, a high retaining effect can be obtained.

  The interphase insulating paper 30 of the second embodiment may be reversed in the direction of insertion between the windings 5. That is, the interphase insulating paper 30 is inserted between the windings 5 in such a direction that the central ridge line 13 ′ side is the radially inner side of the iron core 3 and the two ridge lines 14 a ′ and 14 b ′ side are the radially outer side. The interphase insulating paper 30 spreads so that both sides 10a and 10b are separated from each other on the open side of the slot 6, and spreads so that two ridges 14a 'and 14b' are separated from each other on the bottom side of the slot 6 (FIG. 5 arrows D1 and D2). As a result, the contact area of the outer surface 18E of the interphase insulating paper 30 with respect to the side of the winding 5 can be increased, and an insulation abnormality due to contact between the windings 5 can be eliminated. Play.

  In the interphase insulating paper 40 of the third embodiment shown in FIG. 8, the parallel folding lines 14a and 14b are omitted, while the central folding line 13 is configured as a folding line for folding. The interphase insulating paper 40 is divided into two areas, a first area 41 and a second area 42, by the central folding line 13.

  Similarly to the interphase insulating paper 9 of the first embodiment, the interphase insulating paper 40 is formed so that the protruding pieces 12u and 12d protrude from the left and right side edges 10a and 10b, and at both ends in the longitudinal direction, Folded portions 16a and 16b are formed that are folded by the folding lines 17a and 17b. When the interphase insulating paper 40 is folded, first, the upper and lower edge fold lines 17a and 17b are valley-folded, and the folded portions 16a and 16b are folded toward the front side (first surface 18E). In the central folding line 13, the second line segment 132 is folded in a mountain (the other line segments 131 and 133 are folded in a valley), and the interphase insulating paper 40 is folded in two. Thereby, at both ends in the longitudinal direction of the interphase insulating paper 40, the folded portions 16a and 16b are folded over the first region 41 and the second region 42, resulting in quadruple, and thus the rigidity is improved.

  About the folded interphase insulating paper 40, the protruding pieces 12u and 12d are inserted between the windings 5 with the iron core 3 facing outward in the radial direction. Therefore, the interphase insulating paper 40 engages so that the protruding pieces 12u and 12d sandwich the both end surfaces 3c and 3d in the axial direction of the iron core 3. Then, the interphase insulating paper 40 between the windings 5 expands so that the entire insulating paper 40 has a V shape by its own restoring force. As described above, each of the teeth 3 a or the insulating spool 4 is wound so that the winding 5 forms a rectangular tube shape, and the gap between the windings 5 is narrower on the radially inner side than the radially outer side of the iron core 3. For this reason, the contact area of the outer surface 18E with respect to the side surface side of the coil | winding 5 is inserted by inserting the open end side (side 10a, 10b) which makes the V shape of the interphase insulating paper 40 toward the radial direction outer side of the iron core 3. By making it as large as possible, the effect of preventing the interphase insulating paper 40 from coming off can be enhanced. In addition, the folded portions 16a and 16b of the interphase insulating paper 40 can suppress misalignment of the interphase insulating paper 40, and can eliminate an abnormal insulation caused by contact between the windings 5. There is an effect similar to the form.

  The interphase insulating paper 50 of the fourth embodiment shown in FIG. 9 is different from the interphase insulating paper 40 of the third embodiment in that the protruding pieces 12u and 12d are omitted. The interphase insulating paper 50 is folded in the same manner as the interphase insulating paper 40, and the side edges 10 a and 10 b are inserted between the windings 5 with the side edges 10 a and 10 b facing outward in the radial direction of the iron core 3. The interphase insulating paper 50 is not directly engaged with the iron core 3 because there is no projecting piece 12u, 12d, but, like the interphase insulating paper 40, the entire insulating paper 50 is V-shaped by its own restoring force. spread. Accordingly, the same effects as those of the third embodiment can be achieved, such as the positional deviation of the interphase insulating paper 40 can be suppressed by the folded portions 16a and 16b of the interphase insulating paper 40.

  The interphase insulating paper 50 of the fourth embodiment may be reversed in the direction of insertion between the windings 5. That is, the interphase insulating paper 50 is inserted between the windings 5 in such a direction that the central ridge line 13 ′ is radially outward of the iron core 3, and the side edges 10 a and 10 b are radially inward. , 10b spread so as to be separated from each other.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  The interphase disconnection sheet may be a substantially rectangular sheet material including a square shape, and is not limited to the interphase insulating paper 9, 30, 40, 50. That is, the dimensions of the interphase insulating paper 9, 30, 40, 50 can be changed as appropriate according to the dimensions of the iron core 3 and the winding 5, and the gap between the windings 5. A configuration of folding by folding or a configuration of folding by folding is selectively employed. Even in this case, the rigidity is added as described above by folding in the two-fold, and the rigidity can be further increased by folding in the four-fold.

  In the interphase insulating paper 9, 30, 40, 50, the folded portions 16a, 16b folded at the edge fold lines 17a, 17b may be folded in the above-described two-fold or four-fold manner. At both ends in the longitudinal direction of the interphase insulating paper 9, 30, 40, 50 folded, the folded portions 16a, 16b are quadrupled when the two-folded, and eight-folded when the four-folded. For this reason, even if comprised using comparatively thin interphase insulating paper, sufficient thickness in the folding | turning part 16a, 16b is securable.

  The drive motor 1 is not limited to the above-described electric vehicle, but may be applied to a vehicle including wheels that can be driven by the driving force output from the drive motor 1 such as a hybrid vehicle.

  In the drawings, 1 is a rotating electrical machine, 2 is a stator, 3 is a stator core, 5 is a winding, 9, 30, 40, and 50 are interphase insulating sheets, 13 is a central folding line, and 10a and 10b are parallel to the central folding line. A pair of sides, 11a and 11b are a pair of sides orthogonal to the central folding line, 12u and 12d are protruding pieces, 13 'is a central ridge line, 14a and 14b are parallel folding lines, 16a and 16b are folded portions, and 17a and 17b are edge folding lines. , 20 indicates a seat body, and WR and WL indicate wheels.

Claims (6)

A stator core,
A plurality of windings wound in a concentrated winding around the stator core;
An interphase insulating sheet inserted between the plurality of windings,
The interphase insulating sheet is
The central fold line parallel to which a pair of parallel fold lines and the central fold line to be formed and the the direction center to folded at said pair of parallel fold lines at positions sandwiching the both sides of one central fold line that will be formed in the center The plurality of windings are wound in a direction in which the central fold line is oriented in the axial direction of the stator core in a state where the fold line is folded in three fold lines that are folded back so that the directions folded at the fold line are alternate. The seat body inserted between,
Via an edge fold line extending in a direction perpendicular to the center fold line, the sheet body is continuously provided to be folded at both ends in the direction of the center fold line, and the sheet body is inserted between the plurality of windings. the stator of the rotary electric machine characterized by a Turkey and a folded portion which is fitted between the plurality of windings each other.   2. The rotation according to claim 1, further comprising a pair of projecting pieces provided on at least one of the sheet main body and the folded portion of the interphase insulating sheet and engaged so as to sandwich the stator core in the axial direction. Electric stator. The folded portion, a stator of a rotary electric machine according to claim 1 or 2, wherein the located outside of the seat body before Symbol fourfold to face to the winding between the plurality of windings mutually . The interphase insulating sheet has a substantially rectangular shape in a developed state,
The pair of parallel fold lines is such that one of the parallel fold lines is at an intermediate position between one side parallel to the central fold line and the central fold line in the periphery of the interphase insulating sheet or more than the central fold line. It is formed at a position close to the side of
The other parallel folding line is formed at a position between the other side of the interphase insulating sheet parallel to the central folding line and the central folding line, or at a position closer to the other side than the central folding line. And
The interphase insulating sheet is inserted from a central ridge line side formed by folding the sheet main body at the central folding line between the plurality of windings. The stator of the rotary electric machine of any one of Claims 1. The stator according to any one of claims 1 to 4,
A rotating electric machine comprising: a rotor disposed in a field space of the stator. The rotating electrical machine according to claim 5;
An automobile comprising: a wheel that can be driven by a driving force output by the rotating electrical machine.

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