JP5650819B2 - Stator manufacturing method - Google Patents

Description

  The present invention relates to a stator manufacturing method.

  Conventionally, a stator of an inner rotor type rotating electrical machine includes an annular stator core having a plurality of teeth portions extending radially inward in the radial direction, and three-phase coils wound around the teeth portions. Some of such stators have a structure in which the stator core is divided for each tooth portion in order to improve the coil space factor (see, for example, Patent Document 1). For stators with split cores, the stator is in an expanded state where the tips of the teeth portions are opened rather than in an annular state, and a coil is wound around each teeth portion, and then each split is made so that the teeth portions face radially inward. The stator is formed by rolling the core into an annular shape. As described above, since the coil can be wound in the deployed state of the stator, the space factor of the coil can be improved.

  By the way, in the stator of patent document 1, one conducting wire is wound around each tooth part, and a coil is wound around each tooth part. However, in such a stator, all the ends of the plurality of coils (conductive wires) must be connected to a predetermined conductive member, so that the connection work is complicated.

  As a technique for solving this problem, for example, in the technique disclosed in Patent Document 2, a coil having the same phase is constituted by one conductive wire, and a connecting wire is formed between the coils having the same phase. One end of each phase conducting wire is connected to a common neutral point, and the other end of each phase conducting wire is supplied with an alternating current having a phase difference of 120 degrees. According to such a configuration, since the number of conducting wires can be made smaller than the number of teeth portions, it is possible to reduce the number of man-hours related to the connection work at both ends of each conducting wire. .

Japanese Patent Laid-Open No. 11-18345 Japanese Patent Laid-Open No. 2002-176753

  However, in the stator as described in Patent Document 2, the coils of the same phase are separated in the circumferential direction with the other phases sandwiched therebetween, so that the length of the connecting wire between the coils of the same phase becomes relatively long. . For this reason, in the annular process of the stator and the process of forming the connecting wires after the process into a predetermined shape and connecting them to each other, the connecting wires are easily entangled, and these steps are complicated. In addition, in the stator having the split core, since the stator is annularized from the unfolded state after the coil is wound, the connecting wire must have a sufficient length, which is also the connecting wire. Is a factor that increases.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a stator capable of shortening a wire and suppressing entanglement between jumper wires. .

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a plurality of divided cores having tooth portions are arranged annularly so that tips of the tooth portions are directed radially inward, and the teeth. A stator manufacturing method comprising a plurality of coils each wound around a portion and classified as an n-phase, wherein the stator core is in a deployed state in which the tip of the teeth portion is opened rather than the annular state, By winding a conductive wire continuously on the adjacent teeth portion via a cross-phase crossover wire, a winding step of winding the coils of different phases around the adjacent tooth portions, and after the winding step, Corresponding to the annular phase of the stator core in an unfolded state so that the teeth portion faces radially inward, and each phase spanned between the coils of different phases adjacent in the circumferential direction after the annular phase A cross-corresponding wire corresponding to each phase spanned between the coils of different phases adjacent in the circumferential direction in the state that has undergone the circularization step. Is formed such that the length of at least one of the cross-phase crossover wires is longer than the length of the other cross-phase crossover wires connected to the cross-phase crossover wires, and the cross-phase crossover wires corresponding to each phase There are extended along the axial direction on the counter-stator side than the axial end surface of the stator without intersecting in the circumferential direction, in the crossover wire connection step, the counter-stator side than the axial end face of the stator Of the cross-phase crossover wires extended along the axial direction, cross-phase crossover wires formed longer than the length of the other cross-phase crossover wires are formed into a ring shape following the annular shape of the stator. With Together arranged so as to extend in the circumferential direction in the annular shape of the stator serial by bending the stator side along the axial end surface of the stator, a different phase between connecting wire which is arranged to extend in circumferential direction, wherein The gist of the present invention is to connect other cross-phase connecting wires extending to the side opposite to the stator from the axial end surface of the stator.

  According to this invention, since each connecting wire is formed between the coils adjacent in the circumferential direction, it is possible to configure the connecting wire to be short. Thereby, since the tangling of the connecting wire is suppressed during the annular process of the stator and the connecting wire connecting process, the stator can be easily formed.

The invention according to claim 2 is wound around each of the stator core, which is formed by annularly arranging a plurality of divided cores each having a tooth portion so that the tips of the tooth portions are directed radially inward, and n A method of manufacturing a stator including a plurality of coils classified into phases, wherein the stator core is in a developed state in which a tip of the tooth portion is opened more than the annular state, and the adjacent tooth portions have different phases. A winding step in which the coils of different phases are wound around the adjacent teeth portions by continuously winding the conductive wires through the crossover wires, and after the winding step, the unfolded stator core is connected to the teeth portion. Annularization process in which the coil is oriented so as to face radially inward, and after the annulusing process, crossover wires between different phases corresponding to each phase stretched between the coils of different phases adjacent in the circumferential direction are connected to each other. A crossover wire corresponding to each phase stretched between the coils of different phases adjacent to each other in the circumferential direction in a state where the looping step is performed. Is also extended to the anti-stator side, and in the crossover connecting step, at least one cross-phase crossover line out of the cross-phase crossover lines extended to the anti-stator side from the axial end surface of the stator, In addition to being arranged so as to extend in the circumferential direction within the annular shape of the stator, a crossover between different phases arranged so as to extend in the circumferential direction, and the other extended to the side opposite to the stator from the axial end surface of the stator Are connected to each other, and the plurality of coils are respectively wound around the teeth portion and classified into three phases of a U phase, a V phase, and a W phase. Between the corresponding heterogeneous The crossover lines are a U-V interphase crossover wire, a VW interphase crossover wire, and a W-U interphase crossover wire. After the circularization step, the U-V interphase crossover wire, the VW interphase crossover wire, and the above The gist is to form one of the W-U crossover wires into a ring shape that follows the annular shape of the stator .

According to this invention, since each connecting wire is formed between the coils adjacent in the circumferential direction, it is possible to configure the connecting wire to be short. Thereby, since the tangling of the connecting wire is suppressed during the annular process of the stator and the connecting wire connecting process, the stator can be easily formed.

In this invention, each crossover can be easily connected by the ring-like shape of the crossover .

In the present invention, since there is one connecting wire formed in a ring shape, the length of the connecting wire can be minimized, and the entanglement of the connecting wire can be further suppressed.
According to a third aspect of the present invention, a plurality of divided cores each having a tooth portion are wound around the tooth portion and a stator core in which the tips of the tooth portions are annularly arranged so that the tips of the teeth portions are directed radially inward. A method of manufacturing a stator including a plurality of coils classified into phases, wherein the stator core is in a developed state in which a tip of the tooth portion is opened more than the annular state, and the adjacent tooth portions have different phases. A winding step in which the coils of different phases are wound around the adjacent teeth portions by continuously winding the conductive wires through the crossover wires, and after the winding step, the unfolded stator core is connected to the teeth portion. Annularization process in which the coil is oriented so as to face radially inward, and after the annulusing process, crossover wires between different phases corresponding to each phase stretched between the coils of different phases adjacent in the circumferential direction are connected to each other. A crossover wire corresponding to each phase stretched between the coils of different phases adjacent to each other in the circumferential direction in a state where the looping step is performed. Is also extended to the anti-stator side, and in the crossover connecting step, at least one cross-phase crossover line out of the cross-phase crossover lines extended to the anti-stator side from the axial end surface of the stator, In addition to being arranged so as to extend in the circumferential direction within the annular shape of the stator, a crossover between different phases arranged so as to extend in the circumferential direction, and the other extended to the side opposite to the stator from the axial end surface of the stator Are connected to each other, and the plurality of coils are respectively wound around the teeth portion and classified into three phases of a U phase, a V phase, and a W phase. Between the corresponding heterogeneous The crossover lines are a U-V interphase crossover wire, a VW interphase crossover wire, and a W-U interphase crossover wire. After the circularization step, the U-V interphase crossover wire, the VW interphase crossover wire, and the above Two of the W-U crossover wires are bent and formed so as to close the arch so as to extend to the remaining one of the crossover wires. The gist is to connect with a connection terminal .

According to this invention, since each connecting wire is formed between the coils adjacent in the circumferential direction, it is possible to configure the connecting wire to be short. Thereby, since the tangling of the connecting wire is suppressed during the annular process of the stator and the connecting wire connecting process, the stator can be easily formed.
In this invention, since it becomes possible to shorten the dimension of the circumferential direction of a connecting wire, the entanglement of a connecting wire can be suppressed more and shaping | molding of a connecting wire becomes easy .

  In this invention, the increase in the number of members can be suppressed by connecting each connecting wire with one connection terminal.

  Therefore, according to the above-described invention, it is possible to provide a method for manufacturing a stator that can shorten the wire rods and suppress the entanglement between the jumper wires.

(A) Sectional drawing of the brushless motor of this embodiment, (b) The top view of a brushless motor. (A) The top view of the stator of this embodiment, (b) Sectional drawing of a stator. The schematic plan view for demonstrating the crossover between different phases. Coil connection diagram. Sectional drawing of a connection terminal part. The perspective view which shows the stator after an annularization process. The schematic plan view which shows the stator of another example. The schematic plan view which shows the stator of another example. The schematic plan view which shows the stator of another example. The schematic plan view which shows the stator of another example. The schematic plan view which shows the stator of another example. The schematic plan view which shows the stator of another example.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
A brushless motor 1 shown in FIGS. 1A and 1B is used as a drive source of a power steering device that assists the operation of a vehicle steering shaft connected to a steering wheel of a vehicle (not shown). As shown in FIGS. 1 (a) and 1 (b), a substantially cylindrical stator 3 is fixed to the inner peripheral surface of the bottomed cylindrical housing 2, and inside the stator 3, The rotor 4 is rotatably arranged. The rotor 4 is connected to the vehicle steering shaft (not shown). A holder member 5 made of an insulating synthetic resin material is fixed to the end of the housing 3 on the opening 2 a side of the housing 2, and the holder member 5 covers one end in the axial direction of the stator 3. ing.

  As shown in FIG. 2A, the stator core 6 constituting the stator 3 has a plurality of (in this embodiment, 12 in this embodiment) divided cores 7 arranged on the outer peripheral side of the annular core 7 by connecting members 9. It is connected and has a substantially annular shape. Each divided core 7 is formed with a tooth portion 8 extending radially inward, and each tooth portion 8 is arranged at a predetermined angle (30 ° in the drawing). For convenience of explanation, the reference numerals 8a to 8l are sequentially assigned clockwise from the tooth portion 8 located at the lower right side of the stator 3 in FIG.

  Bobbins 10 (see FIG. 2B) that cover both end surfaces in the axial direction and both side surfaces in the circumferential direction are attached to the teeth portions 8a to 8l from both sides in the axial direction. A coil C is wound from above. The coils C are classified into U-phase coils U1 to U4, V-phase coils V1 to V4, and W-phase coils W1 to W4, respectively, according to the supplied three-phase drive current (U-phase, V-phase, and W-phase). ing.

  As for U-phase coils U1-U4, V-phase coils V1-V4, and W-phase coils W1-W4, two of the four phases are wound around two teeth portions 8 adjacent in the circumferential direction, respectively. The remaining two of each phase are wound around the two teeth portions 8 at 180 ° opposite positions of the two teeth portions 8. Specifically, each tooth portion 8 includes a V-phase coil V1, U-phase coils U4 and U3, W-phase coils W3 and W4, V-phase coils V3 and V4, U, sequentially from the teeth portion 8a to the tooth portion 8l. Phase coils U1, U2 and W phase coils W2, W1 are wound.

  Each of the coils U <b> 1 to W <b> 4 is composed of three conducting wires (first conducting wire 11, second conducting wire 12, and third conducting wire 13) that are concentratedly wound around the tooth portion 8. FIG. 4 is a connection diagram schematically showing a winding mode of the first to third conducting wires 11 to 13. In FIG. 4, the coils C are arranged in the order of the V-phase coil V <b> 2 to the W-phase coil W <b> 1. They are shown side by side from the left. As shown in FIG. 4, the first conducting wire 11 constitutes V-phase coils V2, V1 and U-phase coils U4, U3, and the second conducting wire 12 comprises W-phase coils W3, W4 and V-phase coils. The coils V3 and V4 are configured, and the third conductor 13 configures U-phase coils U1 and U2 and W-phase coils W2 and W1. That is, each of the first to third conducting wires 11 to 13 is continuously wound around four teeth portions 8 that are continuous in the circumferential direction. In addition, each conducting wire 11-13 is the structure which coat | covered the metal wire which consists of an electroconductive metal material (this embodiment copper) with the insulating film.

  The first conducting wire 11 is wound around the tooth portion 8a in a normal direction (in this embodiment, it is wound counterclockwise when viewed from the tip end side of the tooth portion 8), and is wound around the adjacent tooth portion 8b. The teeth portion 8b is wound backward (winded clockwise). Thereby, V-phase coils V2 and V1 are wound around the teeth portions 8a and 8b, respectively. In addition, the start end part of the 1st conducting wire 11 is extended from the V-phase coil V2 to the holder member 5 side, and comprises the 1st V-phase power line 11a. Further, an in-phase connecting wire 14, which is a wire spanned between the U-phase coils U 1 and U 2, is formed at the end of the stator 3 opposite to the holder member 5.

  In addition, the first conductive wire 11 is stretched from the tooth portion 8b to the adjacent tooth portion 8c and wound around the teeth portion 8c, and from there to the adjacent tooth portion 8d to be further wound. The U-phase coils U4 and U3 are wound around the teeth portions 8c and 8d, respectively. And the terminal part of the 1st conducting wire 11 is extended to the same side as the said 1st V-phase power line 11a from the U-phase coil U3, and comprises the 1st U-phase power line 11b. Further, the U-V interphase connecting wire 11c, which is a wire extending between the adjacent V phase coil V1 and U phase coil U4, is on the same side as the first V phase power line 11a and the first U phase power line 11b. It is extended and formed. The in-phase connecting wire 14, which is a wire extending between the U-phase coils U 4 and U 3, is formed on the side opposite to the U-V connecting wire 11 c.

  The second conducting wire 12 is wound around the teeth portions 8e to 8h in substantially the same manner as the first conducting wire 11. And, the W-phase coils W3 and W4 and the V-phase coils V3 and V4 are wound around the tooth portions 8e to 8h by the second conducting wire 12, respectively, but the adjacent W-phase coil W4 and V-phase coil V3 The length of the V-W interphase connecting wire 12c, which is a wire spanned between the two, is shorter than the length of the U-V interphase connecting wire 11c. The VW interphase connecting wire 12c is formed in an arch shape that is slightly separated from the axial end surface of the stator 3 (see FIG. 3).

  The third conductor 13 is wound around the tooth portions 8i to 8l in the same manner as the second conductor 12, and the U-phase coil U1 is wound around the teeth portions 8i to 8l by the third conductor 13. , U2 and W-phase coils W2, W1 are wound. That is, the W-U phase crossover wire 13c, which is a wire spanned between the U-phase coil U2 and the W-phase coil W2 adjacent to each other, is equal in length to the V-W phase crossover wire 12c of the second conducting wire 12. (See FIG. 3).

  As shown in FIG. 2 (b), the U-V connecting wire 11c of the first conducting wire 11 is bent at a substantially right angle at the root portion extending from the V-phase coil V1 and the U-phase coil U4. It is formed along the axial end surface of the stator 3. Further, as shown in FIG. 3, the U-V interphase connecting wire 11 c is formed in a ring shape that fits the inner diameter of the stator 3 and the outer diameter or less, following the annular shape of the stator 3. Such a U-V interphase crossover wire 11c is formed to a minimum necessary length that can be connected to the VW interphase crossover wire 12c and the W-U interphase crossover wire 13c. The U-V interphase crossover wire 11c is connected to the VW interphase crossover wire 12c and the W-U interphase crossover wire 13c by the connection terminals 15, respectively. Note that the V-W interphase connecting wire 12c and the W-U interphase connecting wire 13c are formed to have a length that can be connected to the U-V interphase connecting wire 11c by the connection terminal 15.

  As shown in FIG. 5, the connection terminals 15 are folded back so as to wrap around the U-V interphase crossover line 11 c and the VW interphase crossover line 12 c (or the W-U interphase crossover line 13 c) arranged in contact with each other. Is formed. The U-V inter-phase crossover wire 11c is electrically connected to the V-W inter-phase crossover wire 12c and the W-U inter-phase crossover wire 13c by fusing or the like. Thus, the neutral point is comprised by connecting each crossover wire 11c-13c.

  As shown in FIG. 1, the holder member 5 includes an outer cylindrical portion 5 b that extends in an axial direction from the annular bottom portion 5 a and is fixed to the inner peripheral surface of the housing 2, and an outer cylindrical portion that extends from the bottom portion 5 a. And an inner cylindrical portion 5c extending inward of 5b. And between the outer side cylinder part 5b and the inner side cylinder part 5c, the connecting wire accommodation recessed part 5d hollow in an axial direction is formed, and this connecting wire accommodation recessed part 5d is mutually connected between U-V phase. A crossover wire 11c, a V-W interphase crossover wire 12c, and a W-U interphase crossover wire 13c are accommodated. The holder member 5 has three cutout portions 5e formed to extend in the radial direction, and each cutout portion 5e has power supply terminals 21a, 21b, and 21c corresponding to three-phase drive currents, respectively. Is held.

  As shown in FIGS. 1 and 2, the first V-phase power line 11a derived from the V-phase coil V2 is a second V-phase power line 12b derived from the V-phase coil V4 (the terminal portion of the second conducting wire 12). The V-phase power lines 11a and 12b are electrically connected to the power supply terminal 21a by fusing or the like. Further, the first U-phase power line 11b derived from the U-phase coil U3 (the terminal portion of the first conducting wire 11) is the second U-phase power line 13a derived from the U-phase coil U1 (the starting end of the third conducting wire 13). The U-phase power lines 11b and 13a are electrically connected to the power supply terminal 21b by fusing or the like. Also, the first W-phase power line 12a derived from the W-phase coil W3 (starting end portion of the second conducting wire 12), and the second W-phase power line 13b derived from the W-phase coil W1 (termination of the third conducting wire 13). Each part) extends slightly from the U-phase coil U2 to a position closer to the U-phase coil U1. The W-phase power lines 12a and 13b are electrically connected to the power feeding terminal 21c by fusing or the like. The drive currents of the corresponding phases are supplied to the power lines 11a to 13b of the respective phases via the power supply terminals 21a, 21b, and 21c.

  As shown in FIG. 1 (a), the rotating shaft 31 constituting the rotor 4 is pivotally supported by a pair of bearings 32 (only one is shown) provided in the housing 2. A cylindrical rotor core 33 is fixed to the rotating shaft 31, and a magnet 34 magnetized with different polarities (N pole, S pole) at predetermined angles is fixed to the outer peripheral surface of the rotor core 33. ing.

  In the brushless motor 1 configured as described above, the three-phase drive current having a phase difference of 120 ° from a drive circuit (not shown) is supplied to the coils U1 to W4 via the power supply terminals 21a, 21b, and 21c. To be supplied. Then, each of the coils U1 to W4 is excited to generate a rotating magnetic field in the stator 3, and the rotor 4 rotates based on the rotating magnetic field.

Next, a method for manufacturing the stator 3 configured as described above will be described.
First, the divided cores 7 are arranged in a straight line so that the tooth portions 8 are parallel to each other, and the stator core 6 is set in a developed state. In this unfolded state, each split core 7 is connected by a connecting member 9 so that the outer peripheral end can be rotated. In this unfolded state, a winding process of winding the coils U1 to W4 around each tooth portion 8 is performed.

  In the winding step, the first to third conductive wires 11 to 13 are concentratedly wound around the teeth portions 8 in the manner described above using a winding machine (not shown). The first conductor 11 is continuously wound in the order of the teeth 8a to 8d, the second conductor 12 is successively wound in the order of the teeth 8e to 8h, and the third conductor 13 is successively wound in the order of the teeth 8i to 8l. Is done. At this time, the U-V interphase crossover wire 11c is drawn to a length that can be connected to the VW interphase crossover wire 12c and the W-U interphase crossover wire 13c. This winding may be performed sequentially for each of the first to third conducting wires 11 to 13, or the first to third conducting wires 11 to 13 may be wound simultaneously.

  Next, an annularization process is performed in which the stator 3 in the expanded state is rounded and formed into an annular shape so that the tips of the tooth portions 8a to 8l face radially inward. Through this process, the stator 3 is in a state as shown in FIG. In the present embodiment, since the connecting wires existing in the stator 3 (the connecting wires 11c to 13c between the different phases and the connecting wires 14 between the in-phases) all extend between the adjacent coils U1 to W4, each connecting wire The wire can be configured to be short, which prevents the crossover wires from being entangled with each other during the circularization step. As a result, the annular process of the stator 3 can be easily performed.

  Next, a crossover forming process for forming the U-V interphase connecting wire 11c into a predetermined shape is performed. In the connecting wire forming step, the U-V interphase connecting wire 11c is formed into a ring shape following the annular shape of the stator 3 using a jig (not shown), and then tilted at a substantially right angle to the stator 3 side. Also in this process, since all the connecting wires existing in the stator 3 are between the adjacent coils U1 to W4, the entanglement between the connecting wires is suppressed, and the U-V interphase connecting wire 11c can be easily formed. It can be molded.

  Next, a connecting wire connecting process for connecting the connecting wires 11c to 13c to each other is performed. In the connecting wire connecting step, the U-V connecting wire 11c is connected to the V-W connecting wire 12c and the W-U connecting wire 13c by the connecting terminal 15 and electrically connected by fusing or the like. The Through this step, the crossover wires 11c to 13c are in a state as shown in FIG. Next, the power lines 11a to 13b of the respective phases are formed so as to have the above-described form, and are arranged at positions corresponding to the power feeding terminals 21a to 21c of the holder member 5, and then the power lines 11a to 13b. Is derived radially outward.

  Next, the stator 3 formed in this way is assembled to the housing 2. Thereafter, the holder member 5 is assembled to the housing 2, and the crossover wires 11 c to 13 c are accommodated in the crossover housing recess 5 d of the holder member 5. Next, each of the power lines 11a to 13b is inserted into the notch 5e of the holder member 5 and is electrically connected to the corresponding power feeding terminals 21a to 21c.

Next, characteristic effects of the present embodiment will be described.
(1) In the brushless motor 1 according to the present embodiment, the U-phase coil U1 to W4 is wound around the different-phase coils U1 to W4 by continuously winding the different-phase coils U1 to W4 around the teeth portions 8 adjacent in the circumferential direction. A -V phase connecting wire 11c, a V-W phase connecting wire 12c, and a W-U phase connecting wire 13c are provided, and the connecting wires 11c to 13c are connected to each other to form a neutral point. Accordingly, since the crossover wires 11c to 13c between the different phases are formed between the coils U1 to W4 adjacent in the circumferential direction, the crossover wires 11c to 13c can be configured to be short. Thus, the stator 3 can be easily entangled because the crossover of the stator 3 and the connecting wires after the process are formed into a predetermined shape and connected to each other are suppressed. Can be molded. Moreover, since the 1st-3rd conducting wires 11-13 may be short, it can contribute to cost reduction.

  (2) In the present embodiment, the U-V interphase connecting wire 11 c is formed in a ring shape that follows the annular shape of the stator 3. Thereby, it becomes possible to make the length of each crossover wire 11c-13c between different phases into the required minimum, and the entanglement of the crossover wires 11c-13c can be suppressed more.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the U-V interphase crossover line 11c is formed in a ring shape, but as shown in FIG. 7, two cut lines 41 formed by cutting the U-V interphase crossover line 11c, respectively, It is good also as a structure connected to the V-W interphase connecting line 12c and the W-U interphase connecting line 13c. The connecting wire to be cut may be any of the connecting wires 11c to 13c between the different phases, and two or all of the connecting wires 11c to 13c may be cut. According to such a structure, it becomes possible to make the connecting wire between different phases shorter.

  -The connection aspect of the crossover wires 11c-13c between different phases is not the limit of the said embodiment. For example, as shown in FIG. 8, the V-W interphase connecting wire 51 is bent so as to close its arch shape and extends to the U-V interphase connecting wire 52 following the annular shape of the stator 3. That is, both the portion derived from the V-phase coil V3 and the portion derived from the W-phase coil W4 in the V-W phase connecting wire 51 extend in one circumferential direction. The V-W interphase crossover wire 51 is connected to the U-V interphase crossover wire 52 by the connection terminal 15. Similarly, the W-U phase crossover wire 53 is bent so as to close its arch shape, and extends to the VW phase crossover wire 51 following the annular shape of the stator 3. 51 and the connection terminal 15 are connected. Even with such a configuration, the same effect as the effect (1) in the above-described embodiment can be obtained. In addition, since it is possible to shorten the circumferential dimension of each of the connecting wires 51 to 53, the tangling of each of the connecting wires 51 to 53 can be further suppressed. It becomes possible to connect easily.

  Further, the stator 3 shown in FIG. 8 may be partially changed to have a configuration as shown in FIGS. 9 and 10. In the stator 3 shown in FIG. 9, the U-V interphase connecting wire 52 is bent so as to close its arch shape, and the W−V following the annular shape of the stator 3, similarly to the other connecting wires 51 and 53. It extends to the U-phase transition wire 53 and is connected to the W-U transition wire 53 by the connection terminal 15. Further, in the stator 3 shown in FIG. 10, the W—U phase connecting wire 13 c extends to the U—V interphase connecting wire 52 following the annular shape of the stator 3, and is connected to the U—V interphase connecting wire 52. . The connecting wires 51 to 53 are connected by a single connection terminal 54. 9 and 10 can provide the same effect as the effect (1) of the above embodiment. In addition, according to the configuration shown in FIG. 10, an increase in the number of members can be suppressed.

  In the above embodiment, the U-V interphase wire 11c is formed in a ring shape following the annular shape of the stator 3, but the V-W interphase wire 12c or W-U is used instead of the U-V interphase wire 11c. The crossover wire 13 c may be formed in a ring shape that follows the annular shape of the stator 3. Further, in addition to the U-V interphase crossover wire 11 c, either the VW interphase crossover wire 12 c or the W-U interphase crossover wire 13 c may be formed in a ring shape following the annular shape of the stator 3.

  Further, as shown in FIGS. 11 and 12, all of the connecting wires 11 c to 13 c between the different phases may be formed in a ring shape following the annular shape of the stator 3. In the stator 3 shown in FIG. 11, the connecting wires 11 c to 13 c are connected together at the connection terminal 15 in a three-wire manner. Further, in the stator 3 shown in FIG. 12, each of the crossover wires 11 c to 13 c is connected by two wire connections at three connection terminals 15. Even with the configuration as shown in FIG. 11 and FIG. 12, the same effect as the effect (1) in the above-described embodiment can be obtained. In addition, according to the configuration shown in FIG. 11, an increase in the number of members can be suppressed.

  In the above embodiment, the two-wire connection is made by connecting the two wires of the U-V interphase crossover wire 11c and the VW interphase crossover wire 12c (W-U interphase crossover wire 13c) with the connection terminal 15. The W-phase connecting wire 12c is bent, the portion derived from the W-phase coil W4 of the connecting wire 12c and the portion derived from the V-phase coil V3 are overlapped, and these two wires and the U-V phase connecting wire are overlapped. It is good also as a 3-wire connection connected so that 11c may be wrapped.

  In the above embodiment, the winding process is performed in a state where the divided cores 7 are linearly arranged so that the tooth portions 8a to 8l are parallel to each other, but the tips of the tooth portions 8a to 8l are radially outward. The winding step may be performed in a state where the split cores 7 are arranged in an annular shape so as to face (in a reverse sled state).

  In the above embodiment, the number of divided cores 7 constituting the stator core 6 is twelve, but is not particularly limited to this, and may be smaller than twelve or larger. In this case, the number of coils is changed according to the number of divided cores.

  In the above embodiment, the U-phase coils U1 to U4, the V-phase coils V1 to V4, and the W-phase coils W1 to W4 are each wound around two teeth portions 8 adjacent to each other in the circumferential direction. The remaining two of each phase are wound around the two tooth portions 8 at 180 ° opposite positions of the two tooth portions 8, but there are, for example, four coils for each phase. May be wound around each tooth portion 8 so as to be arranged at intervals of 90 degrees in the circumferential direction.

In the above embodiment, each in-phase connecting wire 14 is formed on the opposite side to each of the connecting wires 11c to 13c between the different phases, but may be provided on the same side as each of the connecting wires 11c to 13c between the different phases. .
In the above embodiment, each of the connecting wires 11c to 13c is connected to the connecting terminal 15 on the coil C. However, for example, each of the connecting wires 11c to 13c is connected to the connecting terminal held by the holder member 5 You may comprise. According to this configuration, since the connecting wire and the coil can be separated from each other, it is possible to improve the insulation reliability between the coil and the connecting wire.

In the above embodiment, the coil C is classified into three phases. However, the present invention is not particularly limited to this, and may be an n phase (n is a natural number of 2 or more).
Next, a technical idea that can be grasped from the above embodiment and another example will be added below.

  (A) Cut one of the U-V interphase crossover wire, the VW interphase crossover wire, and the W-U interphase crossover wire, and replace the two cut lines formed by the cut with the remaining 2 It is characterized by connecting to two connecting lines.

  Thereby, the crossover between different phases can be made shorter.

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor, 2 ... Housing, 3 ... Stator, 4 ... Rotor, 5 ... Holder member, 6 ... Stator core, 7 ... Divided core, 8 (8a-8l) ... Teeth part, 11-13 ... 1st-3rd 11c, 52 ... U-V crossover wire, 12c, 51 ... VW interphase wire, 13c, 53 ... WU phase crossover wire, 15,54 ... connection terminal, C ... coil, U1-U4 ... U-phase coil, V1-V4 ... V-phase coil, W1-W4 ... W-phase coil.

Claims (3)

A plurality of divided cores each having a tooth portion, and a stator core formed in an annular shape so that the tips of the tooth portions are directed radially inward; a plurality of coils wound around the teeth portion and classified into n phases; A stator manufacturing method comprising:
The stator core is in an unfolded state in which the tip of the tooth portion is more open than the annular state, and the adjacent tooth portions are wound around the adjacent tooth portions continuously via a cross-phase crossover wire. Winding step of winding the coils of different phases on
After the winding step, an annularization step of annularizing the expanded stator core so that the teeth portion faces radially inward,
A crossover connection step of connecting cross-phase crossover wires corresponding to each phase spanned between the coils of different phases adjacent in the circumferential direction after the circularization step;
In the state that has undergone the circularization step, the cross-phase crossover wire corresponding to each phase that is spanned between the coils of different phases adjacent in the circumferential direction has a length of at least one cross-phase crossover wire that is between the different phases. It is formed longer than the length of the other cross-phase crossover wires connected to the crossover wires, and the cross-phase crossover wires corresponding to each phase do not intersect each other in the circumferential direction and are more anti-stator than the stator axial end face. It extends along the axial direction to the side,
In the connecting wire connecting step, the connecting wire is formed to be longer than the length of the other connecting wires between the different phases out of the connecting wires between the different phases extending in the axial direction on the opposite side of the stator from the axial end surface of the stator. The crossover wires between different phases are formed into a ring shape that follows the annular shape of the stator, and are arranged so as to extend in the circumferential direction within the annular shape of the stator by being bent toward the stator side along the axial end surface of the stator. In addition, the cross-phase crossover wire arranged to extend in the circumferential direction and another cross-phase crossover wire extended to the side opposite to the stator from the axial end surface of the stator are connected to each other. A method for manufacturing a stator. A plurality of divided cores each having a tooth portion, and a stator core formed in an annular shape so that the tips of the tooth portions are directed radially inward; a plurality of coils wound around the teeth portion and classified into n phases; A stator manufacturing method comprising:
The stator core is in an unfolded state in which the tip of the tooth portion is more open than the annular state, and the adjacent tooth portions are wound around the adjacent tooth portions continuously via a cross-phase crossover wire. Winding step of winding the coils of different phases on
After the winding step, an annularization step of annularizing the expanded stator core so that the teeth portion faces radially inward,
A crossover connection step of connecting the crossover wires between different phases corresponding to the phases spanned between the coils of different phases adjacent in the circumferential direction after the circularization step;
With
In the state that has undergone the annularization step, the cross-phase crossover wires corresponding to the respective phases spanned between the coils of different phases adjacent in the circumferential direction are extended to the side opposite to the stator from the axial end surface of the stator. And
In the crossover connecting step, at least one cross-phase crossover wire out of the cross-phase crossover wires extended to the opposite side of the stator from the axial end surface of the stator extends in the circumferential direction within the annular shape of the stator. And connecting the different phase crossover wires arranged so as to extend in the circumferential direction and other cross phase crossover wires extending to the side opposite to the stator from the axial end surface of the stator,
The plurality of coils are respectively wound around the teeth portion and classified into three phases of U phase, V phase, and W phase,
The crossover lines between the different phases corresponding to the respective phases are a U-V interphase crossover line, a VW interphase crossover line, and a W-U interphase crossover line,
After the circularization step, one of the U-V interphase crossover wire, the VW interphase crossover wire, and the W-U interphase crossover wire is formed into a ring shape that follows the annular shape of the stator. A manufacturing method of a stator characterized by the above. A plurality of divided cores each having a tooth portion, and a stator core formed in an annular shape so that the tips of the tooth portions are directed radially inward; a plurality of coils wound around the teeth portion and classified into n phases; A stator manufacturing method comprising:
The stator core is in an unfolded state in which the tip of the tooth portion is more open than the annular state, and the adjacent tooth portions are wound around the adjacent tooth portions continuously via a cross-phase crossover wire. Winding step of winding the coils of different phases on
After the winding step, an annularization step of annularizing the expanded stator core so that the teeth portion faces radially inward,
A crossover connection step of connecting the crossover wires between different phases corresponding to the phases spanned between the coils of different phases adjacent in the circumferential direction after the circularization step;
With
In the state that has undergone the annularization step, the cross-phase crossover wires corresponding to the phases spanned between the coils of different phases adjacent in the circumferential direction are extended to the side opposite to the stator from the axial end surface of the stator. And
In the crossover connecting step, at least one cross-phase crossover wire out of the cross-phase crossover wires extended to the opposite side of the stator from the axial end surface of the stator extends in the circumferential direction within the annular shape of the stator. And connecting the different phase crossover wires arranged so as to extend in the circumferential direction and other cross phase crossover wires extending to the side opposite to the stator from the axial end surface of the stator,
The plurality of coils are respectively wound around the teeth portion and classified into three phases of U phase, V phase, and W phase,
The crossover lines between the different phases corresponding to the respective phases are a U-V interphase crossover line, a VW interphase crossover line, and a W-U interphase crossover line,
After the circularization step, two of the U-V phase crossover wire, the VW phase crossover wire, and the W-U phase crossover wire are arched so as to extend to the remaining one crossover wire. Bend and shape to close,
In the connecting wire connecting step, the connecting wires are connected by one connecting terminal.