Motor

Abstract

To improve the productivity.SOLUTION: The motor includes: a stator with at least one coil; a cross line for connecting the at least one coil; and a plurality of planer terminals provided in the stator. The cross line includes: a coating film; and a conductor wire covered by the coating film, the conductor wire being in contact with the planer terminals. The planer terminals extend in the direction of axis of rotation. The motor has a guide part between the planer terminals in a circumferential direction to guide the cross line.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a motor.

Background Art

[0002] Since the torque characteristics of a motor are determined by the magnetic flux linkage and the winding resistance, winding a large number of low-resistance windings is one means of realizing a high-torque and low-loss motor.

[0003] In order to realize such a motor, a structure in which windings are connected in parallel is adopted, and a method of reducing the winding resistance without causing a decrease in the occupation ratio and productivity due to the use of windings with a large cross-sectional area is known.

[0004] However, the number of connection points increases for parallel connection. In this case, when connecting an insulated electric wire coated with an insulating member such as a heat-resistant resin to a rotating electric machine such as a motor, the conductor of the insulated electric wire is exposed by passing an electric current through the insulated electric wire and the terminal to generate heat, enabling electrical conduction with the terminal. A fusing technique is known. By using the fusing technique, a decrease in productivity can be suppressed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In fusing, heat generated by a large current flowing through the terminal may be transmitted to an insulator or the like, causing deformation or damage to the motor. Furthermore, since cooling of the heated member is required, it takes time for processing.

[0007] On one aspect, an object is to provide a motor capable of improving productivity.

Means for Solving the Problem

[0008] In one aspect, the motor includes a stator, a jumper wire, a plurality of flat terminals, and a bus bar portion. The stator has a coil and an insulator. The jumper wire connects the plurality of coils. The plurality of flat terminals are provided on the insulator. The plurality of flat terminals include a fixing portion provided on the insulator, a connecting portion mounted on the bus bar portion, and a portion between the fixing portion and the connecting portion. The Between the fixing part and the connecting part portion includes a plurality of recesses. The jumper wire includes a coating film and a conducting wire covered with the coating film and in contact with the Between the fixing part and the connecting part portion. The plurality of flat terminals extend in the rotational axis direction. The motor has a guide portion for guiding the jumper wire between the plurality of flat terminals in the circumferential direction.

[0009] According to one aspect, productivity can be improved.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Figure 23

[0011] Hereinafter, embodiments of the motor disclosed in the present application will be described in detail with reference to the drawings. Note that the dimensional relationships of the elements in the drawings, the ratios of the elements, etc. may be different from the actual ones. There may also be portions where the dimensional relationships and ratios are different between the drawings. In each drawing, in order to make the explanation easier to understand, a coordinate axis including at least one of the circumferential direction, radial direction, and axial direction, which will be described later, may be illustrated. Also, in the coordinate axis, the clockwise direction in the circumferential direction may be defined as the positive direction of the X axis, the direction toward the outside in the radial direction may be defined as the positive direction of the Y axis, and the upward direction in the axial direction may be defined as the positive direction of the Z axis.

[0012] First, a motor including a stator and a bus bar portion in the embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing an example of a stator to which the bus bar portion in the embodiment is connected. FIG. 2 is an exploded perspective view showing an example of the bus bar portion and the stator in the embodiment. Note that in FIGS. 1 and 2, the illustration of the jumper wire TR, which will be described later, is omitted.

[0013] As shown in FIG. 1, the motor 1 in the embodiment includes a stator 2 and a bus bar portion 80. The motor 1 in the present embodiment is, for example, an inner rotor type motor. In this case, the stator 2 and the bus bar portion 80 are accommodated in, for example, a motor housing (not shown). Also, on the inner circumferential side in the radial direction of the stator 2, for example, a shaft and a rotor (not shown) are stored.

[0014] The stator 2 and the bus bar portion 80 are connected by a plurality of winding terminals T including the winding terminals Tb3, Td3, Tc4, Ta5, and Td5 shown in FIG. 2. Further, external terminals Xa, Xb, and Xc are further connected to the bus bar portion 80. Note that the winding terminal T is an example of a terminal on a flat plate.

[0015] As shown in FIGS. 1 and 2, the stator 2 includes a stator core 20, an insulator 30, and coils 71 to 76. In the following, when the coils 71 to 76 are not distinguished and expressed, they may be simply denoted as coil 79.

[0016] The stator core 20 in the present embodiment is composed of a plurality of sector pieces 21 to 26 arranged in the circumferential direction, which will be described later. In the following, when the pieces 21 to 26 are not distinguished and expressed, they may be denoted as piece 29.

[0017] In the present embodiment, two adjacent pieces 29 in the circumferential direction are connected via a bendable connecting portion to form a segment. For example, pieces 21A and 22A, whose front view is shown in FIG. 15 and whose plan view is shown in FIG. 16, constitute segment 20α. Similarly, pieces 23 and 24 shown in FIG. 2 constitute segment 20β, and pieces 25 and 26 constitute segment 20γ. Further, the stator core 20 in the present embodiment is formed by joining three segments 20α, 20β, and 20γ in the circumferential direction.

[0018] As shown in FIGS. 1 and 2, the insulator 30 includes a plurality of upper insulators 31 to 36 and a plurality of lower insulators 61 to 66 formed of an insulating material such as resin. In the following, when the upper insulators 31 to 36 are not distinguished and expressed, they may be simply denoted as upper insulator 39.

[0019] The upper insulators 31 to 36 are respectively mounted on the pieces 21 to 26 from the positive direction side in the axial direction. Similarly, the lower insulators 61 to 66 are respectively mounted on the pieces 21 to 26 from the negative direction side in the axial direction. As shown in FIG. 2, for example, the upper insulator 39 is provided with a recess 30X for pressing the stator core 20 with a jig when press-fitting the core into the motor housing on the outer side in the radial direction.

[0020] The winding terminal T is a flat terminal formed of a conductive metal such as copper, for example. FIG. 3 is a perspective view showing an example of the winding terminal in the embodiment. As shown in FIG. 3, the winding terminal T includes a fixing portion T1, a connecting portion T2 extending axially upward (Z-axis positive direction side) from the fixing portion T1, and a plurality of grooves G1 to G6 formed between the fixing portion T1 and the connecting portion T2.

[0021] The fixing portion T1 is inserted into a winding terminal socket formed in the upper insulators 31 to 36 of the stator 2. For example, for the winding terminal Td3 shown in FIG. 2, the fixing portion T1 is inserted into the winding terminal socket Sd3 formed in the upper insulator 32.

[0022] The connecting portion T2 is mounted on the bus bar portion 80 by a winding terminal clip. For example, the winding terminal Tb3 shown in FIG. 2 is mounted on the bus bar portion 80 by the winding terminal clip Cb3. The same applies to the other winding terminals T. In FIG. 2, the winding terminal T is mounted on the bus bar portion 80 for the purpose of explaining the connection structure. However, in the present embodiment, the winding terminal T is mounted on the upper insulator 39 and then mounted on the bus bar portion 80.

[0023] The plurality of grooves G1 to G6 extend in the X-axis direction of the winding terminal T and are dug downward from the inner side (Y-axis negative direction side) to the outer side (Y-axis positive direction side) in the radial direction. The grooves G1 to G6 are an example of a plurality of recesses.

[0024] In this embodiment, the insulated wire C1 forming the coil 79 and the jumper wire TR is wound around two upper insulators 31 and 32 constituting the segment 20α in one stroke, as shown in FIG. 4 illustrating one segment 20α. That is, a plurality of coils 79 are interconnected by the jumper wire TR. FIG. 4 is a perspective view showing an example of an insulator around which the insulated wire in the embodiment is wound. In FIG. 4, illustration of the pieces 21 and 22 to which the upper insulators 31 and 32 are attached, and the lower insulators 61 and 62 attached to the pieces 21 and 22 is omitted.

[0025] As shown in FIG. 4, the coil 71 is formed by winding the insulated wire C1 around the piece 21 via the upper insulator 31 and the lower insulator 61. Similarly, the coil 72 is formed by winding the insulated wire C1 around the piece 22 via the upper insulator 32 and the lower insulator 62.

[0026] In this embodiment, two adjacent coils in the circumferential direction are wound in opposite directions. For example, when the coil 71 is wound in the clockwise direction (CW), the coil 72 adjacent to the coil 71 in the circumferential direction is wound in the counterclockwise direction (CCW).

[0027] In this embodiment, the jumper wire TR drawn out axially upward (on the positive Z-axis side) from the coil 79 is wound around the winding terminal T attached to the upper insulator 39. At that time, the jumper wire TR is wound around the guide portion provided on the upper insulator 39.

[0028] As shown in FIG. 4, a guide portion 51 is provided near the central portion of the upper insulator 31 in the X-axis direction, and a guide portion 52 is provided near the central portion of the upper insulator 32 in the X-axis direction. The guide portion 51 is disposed, for example, between the two winding terminals Tc1 and Td1 in the X-axis direction. Further, a guide portion 57 is further provided on the upper insulator 32 at a position close to the upper insulator 31 in the circumferential direction. In the following, when expressing a plurality of guide portions including the guide portions 51, 52, and 57 without distinction, it may be simply expressed as the guide portion 59.

[0029] For example, the jumper wire TR drawn from the coil 71 is routed to contact the guide portion 51 before contacting the winding terminal Td1. Similarly, the jumper wire TR drawn from the coil 72 is routed to contact the guide portion 52 before contacting the winding terminal Ta2. Further, the jumper wire TR drawn from the winding terminal Td1 into the coil 72 is wound around the guide portion 57.

[0030] As shown in FIG. 4, the jumper wire TR contacts the winding terminal Tc1 at the contact portion CSc1. Similarly, the jumper wire TR contacts the winding terminal Td1 at the contact portion CSd1 and contacts the winding terminal Ta2 at the contact portion CSa2. In the following, when expressing a plurality of contact portions including the contact portions CSc1, CSd1, and CSa2 without distinction, it may be denoted as the contact portion CS.

[0031] As shown in FIG. 4, the plurality of contact portions CS are provided along a line H1 parallel to the direction in which the jumper wire TR extends. That is, the plurality of contact portions CS are provided at substantially the same height in the Y-axis direction. Further, the contact portion CS is provided between any adjacent grooves among the plurality of grooves G1 to G6 of the winding terminal T. The contact portion CS in the present embodiment is provided, for example, between the grooves G2 and G3 of the winding terminal T shown in FIG. 3 in the axial direction (Z-axis direction).

[0032] As shown in Fig. 17, grooves are provided on the radially outer sides of the guide portions 51A and 52A, the contact portion CS is set to the Z-axis height of the parallel line H1, and the guide portion 57 is set at a position where no excessive slack or tension occurs in the crossover line TR when bending the two adjacent pieces 29 at the bendable connecting portion.

[0033] In the present embodiment, the crossover line TR is attached to the winding terminal T by, for example, ultrasonic welding. Fig. 5 is a side view showing an example of the process of attaching the insulated wire to the winding terminal in the embodiment. Fig. 6 is a side view showing an example of the process of attaching the insulated wire to the winding terminal in the embodiment. As shown in Fig. 6, the insulated wire C1 in the present embodiment includes an insulating coating CT0 formed of an insulator and a conductor wire CP formed of a conductor. Note that the insulating coating CT0 is an example of a coating film.

[0034] When ultrasonically welding the insulated wire C1 to the winding terminal T, first, as shown in Fig. 5, a segment 20α in which the insulated wire C1 is arranged is installed in a holding jig (not shown) at the contact portion CS of the winding terminal T mounted on the upper insulator 39. Next, the ultrasonic horn SH is pressed in the direction shown by the arrow P1 in Fig. 5, that is, radially outward (the positive Y-axis direction side). Then, vibration is applied to the pressed insulated wire C1 in the direction shown by the arrow V1 in Figs. 5 and 6, that is, in the axial direction (Z-axis direction).

[0035] Due to the pressing and vibration in ultrasonic welding, the coating film CT0 shown in Fig. 6 is pressed into the grooves G2 and G3 adjacent to the contact portion CS and torn as shown in Fig. 7, thereby peeling off from the conductor wire CP. Fig. 7 is a side view showing an example of the process of attaching the insulated wire to the winding terminal in the embodiment. As shown in Fig. 7, a part CT1 of the peeled coating film CT0 moves to the groove G3.

[0036] The insulated wire C1 is further pressed and vibrated, so that as shown in FIG. 8, the conductor CP is exposed and contacts the winding terminal T. FIG. 8 is a side view showing an example of the insulated wire attached to the winding terminal in the embodiment. FIG. 9 is a perspective view showing an example of the connection terminal to which the insulated wire in the embodiment is attached. As shown in FIGS. 8 and 9, a part CP1 of the conductor CP deformed by being pressed by the ultrasonic horn SH extends from the contact portion CS to both sides in the axial direction (Z-axis direction). Further, when the conductor CP contacts the contact portion CS, the winding terminal T and the conductor CP are electrically connected.

[0037] In the present embodiment, since the ultrasonic horn SH operates only in the Y-axis direction (vertical direction) shown by the arrow P1 in FIG. 5, as shown in FIG. 10, in a state where the upper insulators 31 and 32 are fixed to a jig (not shown), the jig is moved in the direction shown by the arrow X1 in FIG. 10 (positive X-axis direction). FIG. 10 is a top view showing an example of the process of attaching the insulated wire to the winding terminal in the embodiment. Thereby, the insulated wire C1 in contact with each contact portion CS provided at substantially the same height in the Y-axis direction is sequentially joined to the winding terminals Ta2, Td1, and Tc1. In this case, in ultrasonic welding, the time required for one joining is as short as about 0.2 seconds, and further, the heat generation is smaller than that in crimping, and no time for cooling is required. Therefore, the insulated wire C1 can be continuously joined to the winding terminal T in a short time.

[0038] As described above, after the coils 71 and 72 are wound and the jumper wire TR is joined to the winding terminal T by ultrasonic welding, the jumper wire TR is cut on the negative X-axis side of the winding terminal Tc1 and the positive X-axis side of Ta2 shown in FIG. 4. Thereby, since the coils 71 and 72 wound in one stroke become coils commonly connected by Td1, parallel connection by the bus bar becomes easy. Also, for the coils 73 and 74 wound around the segment 20β and the coils 75 and 76 wound around the segment 20γ, the jumper wire TR is similarly joined to each winding terminal T.

[0039] As described above, the motor 1 in the first embodiment includes a stator 2 having coils 71 to 76, a jumper wire TR connecting the plurality of coils 71 to 76, and a plurality of flat terminals T provided on the stator 2. The jumper wire TR includes a coating film CT0 and a conductive wire CP covered with the coating film CT0 and in contact with the flat terminal T. The plurality of flat terminals T extend in the rotation axis direction and have a guide portion 59 for guiding the jumper wire TR between the plurality of flat terminals T in the circumferential direction (X-axis direction). Further, the motor 1 has a guide portion 59 for guiding the jumper wire TR between the plurality of flat terminals T in the circumferential direction. According to such a configuration, the productivity of the motor 1 can be improved.

[0040] As described above, each winding terminal T to which the jumper wire TR drawn from each of the coils 71 to 76 is electrically connected is connected to the bus bar portion 80 shown in FIG. 2. In the present embodiment, as shown in FIG. 11, the bus bar portion 80 includes four bus bars Ba to Bd arranged in the axial direction. FIG. 11 is a side view showing an example of the bus bar in the embodiment. In the present embodiment, the bus bars Ba to Bd are formed of a conductive material such as a copper alloy. As shown in FIGS. 11 and 12, the bus bars Ba to Bd include a plurality of winding terminal joining portions and external terminal joining portions that project radially from a main body portion formed in an annular shape. FIG. 12 is an exploded perspective view showing an example of attachment of terminals to the bus bar in the embodiment. As shown in FIG. 12, the winding terminal joining portions including the winding terminal joining portions Bc1, Bd1, etc. extend in the positive direction side (the upper side shown in the figure) in the axial direction.

[0041] Each winding terminal T is arranged such that the connection part T2 is in surface contact with the winding terminal joint part in the radial direction. Then, a winding terminal clip is attached to each winding terminal T and each winding terminal joint part that are in surface contact, from the positive direction side in the axial direction. For example, the winding terminal Ta2 shown in FIG. 12 is fixed by a winding terminal clip Ca2 in a state of being in surface contact with the winding terminal joint part Ba2 of the bus bar Ba in the radial direction. Thereby, each winding terminal T and each winding terminal joint part are fixed in a state of being electrically connected. Note that, for the bus bar, for example, as shown in FIG. 12, a spacer 82 and a washer 83 for securing a space from other bus bars may be further attached.

[0042] Further, at least one of the bus bars Ba, Bb, Bc, and Bd has an external terminal Xa, Xb, or Xc further connected thereto. Each external terminal is also arranged to be in surface contact with the external terminal joint part of the bus bar in the radial direction, as shown in FIG. 12. Further, an external terminal clip is attached to each external terminal and each external terminal joint part that are in surface contact. For example, the external terminal Xa shown in FIG. 12 is fixed by an external terminal clip CXa in a state of being in surface contact with the external terminal joint part BXa of the bus bar Ba in the radial direction. Similarly, the external terminals Xb and Xc are also fixed to the external terminal joint parts BXb and BXc, respectively. Thereby, the external terminal and the bus bar are electrically connected. Note that the connection by the clip may be reinforced by solder or a conductive adhesive.

[0043] The bus bar shown in FIG. 11 is coupled and integrated by a cover 89 and covers the upper surface and the side surface, as shown in FIGS. 13 and 2. FIG. 13 is a top view showing an example of the bus bar part in the embodiment. The cover 89 in the present embodiment is formed of an insulating material such as resin, for example. As shown in FIG. 13, the cover 89 is formed with a plurality of holes for inserting, for example, the winding terminal clip and the external terminal clip. The cover 89 includes a recess or a protrusion for engaging with the upper insulator 39, as shown in FIGS. 1 and 2.

[0044] FIG. 14 is a top view showing an example of a bus bar in the embodiment. FIG. 14 shows a state in which the cover 89 shown in FIG. 13 is removed. As shown in FIG. 14, the plurality of bus bars Ba, Bb, Bc, and Bd are arranged at substantially the same position in a top view.

[0045] As described above, the coils 71 to 76 are connected in parallel via the winding terminals T electrically connected to the bus bars Ba to Bd. Thereby, the winding resistance of the motor 1 can be reduced and the motor characteristics can be improved.

[0046] As described above, the configuration in the present embodiment has been described, but the embodiment is not limited thereto. For example, although the configuration in which the plurality of grooves G1 to G6 are formed in the winding terminal T has been described, the embodiment is not limited thereto. For example, when the winding terminal T is formed of oxygen-free copper, the insulating wire C1 may be electrically connected even without a groove in some cases.

[0047] Further, for example, the position of the guide portion 59 provided in the insulator is an example, and the guide portion 59 may be provided at a position other than near the center in the X-axis direction of the upper insulator 39. Further, a configuration may be adopted in which a plurality of jumper wires TR are wound around one guide portion 59.

[0048] [First Modification Example] FIG. 15 is a side view showing an example of the upper insulator in the first modification example. In each of the following modification examples, the same reference numerals are given to the same parts as those shown in the drawings described above, and redundant descriptions are omitted. In FIG. 15, upper insulators 31A and 32A, and lower insulators 61A and 62A are attached to pieces 21A and 22A constituting the segment 20α, and coils 71A and 72A are wound around them, respectively.

[0049] In the first modification, as shown in FIG. 15, in addition to the guide portion 52A provided near the center in the X-axis direction on the upper insulator 32A, a guide portion 52G is further provided between the guide portion 52A and the guide portion 512 in the X-axis direction. Further, as shown in FIG. 15, the height of the guide portion 51A in the axial direction (Z-axis direction) is larger than the height of the guide portion 52A in the axial direction. Note that a storage portion 52S for winding the starting end of the insulating wire C1 constituting the coils 71A and 72A is formed on the upper insulator 32A, and a storage portion 51E for winding the terminal end of the insulating wire C1 is formed on the upper insulator 31A.

[0050] FIG. 16 is a top view showing an example of winding an insulating wire around the upper insulator in the first modification. FIG. 17 is a side view showing an example of winding an insulating wire around the upper insulator in the first modification. Note that in FIG. 17, the winding terminal T is not shown. As shown in FIGS. 16 and 17, the jumper wire TRA drawn from the coil 72A is wound around the guide portion 52G and then contacts the guide portion 512.

[0051] In a configuration using a split core in which a plurality of pieces are connected as in the embodiment, by winding the plurality of pieces in a ring shape, a force is applied to the jumper wire TRA between adjacent pieces in the circumferential direction. In this case, when the vibration of the motor is transmitted to the jumper wire TRA, sagging or disconnection of the jumper wire TRA may occur according to the resonance frequency. By providing the guide portion 58A shown in the first modification, the length of the jumper wire TRA between the guide portion 57A provided at the bent portion and the guide portion 58A becomes shorter, and the resonance frequency becomes higher. Thereby, sagging and disconnection of the jumper wire TRA are suppressed.

[0052] Further, as shown in FIGS. 16 and 17, the jumper wire TRA forms the coil 71A after contacting the guide portion 51A. Then, the jumper wire TRA drawn from the coil 71A further contacts the guide portion 51A. Thus, since the jumper wire TRA contacts the guide portion 51A a plurality of times, the guide portion 51A is formed to have a larger height than the guide portion 52A.

[0053] Further, the insulating electric wire C1 wound around the storage part 51E may be configured to be further wound in the opposite direction toward the storage part 52S. In this case, for example, a plurality of jumper wires TR having different potentials may be wound around the guide part 51A. By winding the insulating electric wire C1 back and forth around the coils 71A and 72A in this way, the winding resistance can be reduced and the motor characteristics can be improved. In this case, by further increasing the height of the guide part 51A, the jumper wires TRA having different potentials may be configured to be guided while being separated from each other in the axial direction.

[0054] [Second Modification Example] In the first embodiment, a 6-slot motor including the coils 71 to 76 has been described, but the number of coils is not limited to this. Further, although an example in which the external terminals and the bus bar are configured by separate parts and connected by clips has been described, they may be integrally formed.

[0055] FIG. 18 is a top view showing an example of a stator to which a bus bar is connected in the second modification example. In FIG. 18, the illustration of the cover 89B of the bus bar part 80B is omitted. As shown in FIG. 18, the stator 2B in the second modification example includes twelve pieces 20a to 20l. In the following, when expressing the plurality of pieces 20a to 20l without distinction, they may be denoted as piece 20z.

[0056] In the second modification example, upper insulators 3a to 3l and lower insulators 6a to 6l are respectively attached to the plurality of pieces 20a to 20l. Further, coils 7a to 7l are wound around the plurality of pieces 20a to 20l via the upper insulators 3a to 3l and the lower insulators 6a to 6l, respectively.

[0057] As shown in FIGS. 18 and 22, winding terminals T are respectively mounted on the upper insulators 3a to 3l. For example, winding terminals TUa and TYa are mounted on the upper insulator 3a mounted on the piece 20a.

[0058] Each winding terminal T is connected by the bus bar shown in FIG. 19. FIG. 19 is a perspective view showing an example of a bus bar in the second modification. As shown in FIG. 19, the bus bar portion 80B in the second modification includes four bus bars BW, BV, BU, and BY arranged in the axial direction. Each bus bar is axially separated and opposed by insulating sheets 85B, 86B, and 87B, respectively.

[0059] Each bus bar includes a winding terminal joint portion. For example, as shown in FIG. 19, the bus bar BW includes winding terminal joints BVe, BVk, and BVl. Each winding terminal joint and the winding terminal are electrically connected in a surface contact state by solder, a conductive adhesive, or the like.

[0060] Further, as shown in FIGS. 19 and 20, external terminals are integrally formed on the bus bar in the second modification. FIG. 20 is an exploded perspective view showing an example of a bus bar in the second modification. In FIG. 20, the illustration of the insulating sheets 85B, 86B, and 87B is omitted.

[0061] As shown in FIG. 20, external terminals WX, VX, and UX are integrally formed on the bus bars BW, BV, and BU, respectively. The external terminals WX, VX, and UX respectively correspond to the power of each phase of the W phase, V phase, and U phase. Further, for example, a winding terminal T which is a neutral point terminal is connected to the bus bar BY.

[0062] In the second modification, the four pieces 20z around which four coils are wound each constitute segments 20δ, 20ε, and 20ζ. FIG. 21 is a top view showing an example of winding an insulating wire around the upper insulator in the second modification. Note that in FIG. 21, illustration of the piece 20z to which the upper insulator 3z is attached and the lower insulator 6z attached to the piece 20z is omitted.

[0063] As shown in FIG. 21, each of the segments 20δ, 20ε, and 20ζ is composed of a first piece to a fourth piece. Upper insulators 3B1 to 3B4 are respectively attached to each piece. Guide portions 51B to 54B are respectively formed on each of the upper insulators 3B1 to 3B4.

[0064] Also, one or two of the winding terminals T of the first terminal to the sixth terminal are attached to each of the upper insulators 3B1 to 3B4. For example, as shown in FIG. 21, two of the first terminal TA and the second terminal TB are attached to the upper insulator 3B1. Similarly, the third terminal TC is attached to the upper insulator 3B2, the fourth terminal TD and the fifth terminal TE are attached to the upper insulator 3B3, and the sixth terminal TF is attached to the upper insulator 3B4.

[0065] The coils wound around the first piece to the fourth piece respectively correspond to the winding phases of the motor shown in the table of FIG. 21. Also, the winding terminals T in each segment correspond to the winding terminals T shown in FIG. 18.

[0066] In the second modification, after the insulating wire C1 is wound around each piece from the storage part 54S toward the storage part 51E, the insulating wire C1 is further wound in the reverse direction, that is, from the storage part 51E toward the storage part 54S. In this case, the insulating wires C1 having different potentials are wound around the guide parts 51B and 54B shown in FIG. 21. In such a configuration, as shown in FIG. 17, the guide parts 51B and 54B are formed such that the axial height is larger than that of the other guide parts 52B and 53B so that a plurality of insulating wires C1 can be arranged at intervals in the axial direction.

[0067] Note that in the segment shown in FIG. 21, two insulating wires C1 wound in the forward and reverse directions are simultaneously electrically connected. Further, four coils constituting the same phase of the motor are connected in parallel by, for example, a bus bar. Thereby, compared with the case where the coils are connected in series, the winding resistance can be reduced and the motor characteristics can be improved.

[0068] Note that in FIG. 21, the configuration in which the jumper wire TRB is further wound in the opposite direction from the storage part 51E toward the storage part 54S will be described, but a configuration in which the insulating wire C1 is wound only in one direction may also be used.

[0069] [Third Modification] Further, the stator core is not limited to the divided core formed in a fan shape, and may be an integral core formed in a substantially circular shape. FIG. 22 is a perspective view showing an example of a stator in the third modification. FIG. 23 is an exploded perspective view showing an example of a stator in the third modification. As shown in FIG. 23, the stator 2C in the third modification includes a stator core 20C, an upper insulator 30C, and a lower insulator 60C. In the third modification, the stator core 20C is an annular member formed by laminating electromagnetic steel sheets in the axial direction, for example. The upper insulator 30C and the lower insulator 60C are formed in an annular shape so as to cover the stator core 20C from both sides in the axial direction.

[0070] Note that, as shown in FIG. 22, a recess 3CX for pressing the stator core 20 with a jig is formed on the outer side in the radial direction of the upper insulator 30C when the core is press-fitted into a motor housing (not shown). Further, a convex portion 6CX serving as a guide portion to the motor housing is further formed on the stator core 20C.

[0071] In the present embodiment, for example, the upper insulator 30C into which the winding terminal T as shown in FIG. 23 is inserted is fixed to a jig (not shown), and while rotating the jig in the circumferential direction, the ultrasonic horn SH is pressed against the winding terminal T, whereby the jumper wires TR can be sequentially joined to each winding terminal T.

[0072] As described above, the present invention has been described based on the embodiments and each modification example. However, it goes without saying that the present invention is not limited to the embodiments and each modification example, and various changes can be made without departing from the gist of the present invention. Those that have made various changes without departing from such gist are also included in the technical scope of the present invention, which is obvious to those skilled in the art from the description of the claims.

Explanation of Reference Numerals

[0073] 2,2B,2C stator, 20,20C stator core, 21~26,29,21A,22A,20a~20l,20z pieces, 20α,20β,20γ,20δ,20ε,20ζ segments, 30 insulator, 31~36,39,31A,32A,3a~3l,3z,3B1~3B4,30C upper insulator, 51E,52S,54S storage parts, 51,52,57,59,51A,52A,52G,57A,58A,51B~54B,512 guide parts, 61~66,61A,62A,6a~6l,6z,60C lower insulator, 71~76,79,71A,72A,7a~7l coils, 80,80B bus bar parts, 89,89B covers, Ba,Bb,Bc,Bd,BU,BV,BW,BY bus bars, 85B,86B,87B insulating sheets, Ba2,Bc1,Bd1,BVe,BVk,BVl winding terminal joints, T,Ta2,Ta5,Tb3,Tc1,Tc4,Td1,Td3,Td5,TYa winding terminals, T1 fixing part, T2 connecting part, G1~G6 grooves, Ca2,Cb3 winding terminal clips, CSa2,CSc1,CSd1 contact parts, BXa,BXb,BXc external terminal joints, Xa,Xb,Xc,UX,VX,WX external terminals, CXa external terminal clip, Sd3 winding terminal socket, C1 insulated wire, CP,CP1 conducting wires, CT0~CT1 insulation coatings, SH ultrasonic horn

Claims

1. A stator having a coil and an insulator, A jumper wire connecting the plurality of coils, A plurality of flat terminals provided on the insulator, A bus bar portion, and comprising: The plurality of flat terminals include a fixing portion provided on the insulator, a connecting portion attached to the bus bar portion, and a portion between the fixing portion and the connecting portion. The portion between the fixing portion and the connecting portion includes a plurality of recesses. The jumper wire includes a coating film and a conductive wire covered by the coating film and in contact with a portion between the fixing portion and the connecting portion. The plurality of flat terminals extend in the rotational axis direction, and have a guide portion for guiding the jumper wire between the plurality of flat terminals in the circumferential direction. A motor.

2. The contact portions between the jumper wire, the plurality of fixing portions, and the portions between the connecting portions are arranged along the direction in which the jumper wire extends. The motor according to claim 1.

3. A plurality of the contact portions are respectively provided on the portions between the plurality of fixing portions and the connecting portions. The motor according to claim 2.

4. The contact portions are arranged between the plurality of recesses in the axial direction. The motor according to claim 2 or 3.

5. The plurality of flat terminals and the guide portion are arranged side by side along the direction in which the jumper wire extends. The motor according to any one of claims 1 to 4.

6. The conductive wire is welded to a portion between the fixing portion and the connecting portion of the plurality of flat terminals. The motor according to any one of claims 1 to 5.

7. The plurality of conductors are welded to a portion between the fixing portions of the plurality of flat terminals and the connection portions, the motor according to any one of claims 1 to 6.

8. The stator is formed by a plurality of pieces arranged in the circumferential direction, In the circumferential direction, another guide portion is formed between the guide portion and another piece adjacent in the circumferential direction to the piece provided with the guide portion, the motor according to any one of claims 1 to 3.

9. The bus bar portion includes a plurality of bus bars, the motor according to any one of claims 1 to 8.

10. The bus bar is covered by a cover, The cover is engaged with the insulator, the motor according to claim 9.

11. A plurality of external terminals are connected to the bus bar portion, the motor according to any one of claims 1 to 10.

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