JP7365971B2 - Coil winding method and coil winding jig for rotating electric machines - Google Patents

Description

The present invention relates to a technique for winding a stator coil in a rotating electric machine, and particularly to a technique for winding a coil around a stator that employs a split core structure.

In recent years, rotating electric machines such as electric motors have adopted a so-called split core structure in which the stator core is circumferentially divided into teeth, instead of the conventional integrated core stator, in order to achieve higher output by improving the space factor. is increasing. In a stator with such a split core structure, each core is wound with a stator coil, and after the winding is finished, the stator is assembled to form a stator. At this time, the winding methods for the split cores include an inner winding method in which the split cores 51 are arranged in a row as shown in FIG. There are two methods of outer winding in which the wires are wound side by side.

As shown in FIG. 9(a), in the inner winding, split cores 51 are arranged in series using a jig 52, and coils 54 of the same phase are wound while moving the winding nozzle 53 linearly. I will do it. On the other hand, for the outer winding, as shown in FIG. A gap 56 sufficient to accommodate the nozzle 53 is formed. That is, the angle between each divided core 51 is set to be an angle of 40° + α, which is wider than the angle when the cores are assembled (here, 40° because there are 9 cores), and the operating space of the nozzle 53 is secure. Then, the nozzle 53 is moved in the circumferential direction to wind a coil 54 of the same phase.

JP2011-91885A

Among the above-mentioned winding methods, the outer winding method has a smaller amount of core movement when the cores are assembled after winding is completed than the inner winding method, so the amount of excess of the crossover wire 57 can be reduced, and the coil This has the advantage of eliminating waste. On the other hand, the outer winding has the disadvantage that the amount of movement of the nozzle 53 is greater than that of the inner winding, and the number of man-hours required for winding increases accordingly. In other words, each method has its own advantages and disadvantages, and overcoming the shortcomings of each method has traditionally been a challenge. In particular, the excess portion of the crossover wire 57 has problems such as being pinched when the cores are assembled, handling after the cores are assembled, and increased copper loss, which affects the ease of assembly and motor performance. In this case, by employing an outer winding, the surplus amount of the crossover wire can be suppressed compared to that of the inner winding, but further reduction has been required.

An object of the present invention is to shorten the connecting wires between coils of the same phase in a stator with a split core structure that employs an outer winding method, thereby improving the stator assemblability and motor performance.

A coil winding method for a rotating electric machine according to the present invention includes a stator core in which a plurality of divided cores are gathered together in a ring shape along the circumferential direction, and a rotating electric machine in which a coil is wound around teeth formed on each of the divided cores. In the coil winding method, the split cores are arranged in an annular manner, and predetermined split cores are moved along the circumferential direction to create a gap between the split cores through which a coil winding nozzle can enter. The coil is wound around the teeth of the split core using the gap.

In the present invention, in a rotating electrical machine having a split core structure, split cores arranged in an annular manner are appropriately moved along the circumferential direction to form a gap between the split cores into which a coil winding nozzle can enter. Then, using this gap, a coil is wound around the teeth of the split core. As a result, the inner diameter of the split core during winding work can be reduced while securing the nozzle space equivalent to the conventional one. Therefore, when a plurality of in-phase coils are present, the length of the connecting wires connecting them can be shortened, and the surplus of connecting wires when the cores are assembled can be reduced. As a result, the resistance of the coil is reduced, copper loss is reduced, and motor performance can be improved. Furthermore, it is possible to reduce the risk of the excess crossover wire getting caught when assembling the cores, and it is possible to prevent damage to the coil or disconnection during the assembling work. Furthermore, processing of crossover wires after the cores are assembled becomes easy.

In the coil winding method, the divided core adjacent to the divided core to which the coil is to be wound is moved along the circumferential direction, and the divided core adjacent to the divided core to be wound with the coil is moved. The gap into which a coil winding nozzle can enter may be formed between the two. Further, when the split cores have an inner diameter larger than the inner diameter of the stator core when the split cores are gathered together, and the split cores are arranged annularly at equal intervals, the nozzle can be arranged between the adjacent split cores. The split cores are arranged in an annular shape with an inner diameter dimension that creates a gap into which the nozzle cannot enter, and the split cores arranged with the inner diameter dimension are moved in the circumferential direction to create the gap between the split cores into which the nozzle can enter. may be formed.

Furthermore, when the split cores have an outer diameter larger than the inner diameter of the stator core when the split cores are assembled, and the split cores are arranged annularly at equal intervals, the split cores may be arranged between adjacent split cores. By attaching it to a jig having an outer diameter dimension that forms a gap into which the nozzle cannot enter, and moving the jig in the circumferential direction, the gap into which the nozzle can enter is formed between the split cores. Also good.

Another method of coil winding for a rotating electric machine according to the present invention is to provide a rotary electric machine including a stator core in which a plurality of divided cores are gathered together in an annular shape along the circumferential direction. A coil winding method for a rotating electric machine, in which the coil is wound around teeth formed in the split core using the jig, the outer diameter of the jig being When the cores are attached to the jig and arranged at equal intervals along the circumferential direction, the dimensions are set such that a gap is formed between the adjacent divided cores into which a coil winding nozzle cannot enter, and the divided cores are placed in the jig. a step of attaching the jig to a jig and arranging it in an annular shape along the circumferential direction; a step of forming a gap between the split cores into which the nozzle can enter by moving the jig in the circumferential direction; and a step of forming a gap into which the nozzle can enter. The method is characterized by comprising the step of winding the coil around the teeth using the possible gap.

In a rotating electrical machine having a split core structure, the present invention provides a coil winding method for a rotating electrical machine in which the split core is arranged in a jig having an outer diameter larger than the inner diameter of the stator core and the coil is wound therein. The outer diameter of the split cores is set to such a size that when the split cores are arranged at equal intervals along the circumferential direction of the jig, a gap is formed between adjacent split cores into which the nozzle cannot enter. Then, there is a step of arranging the split cores in a ring shape on this jig, a step of moving the jig in the circumferential direction to form a gap between the split cores through which the nozzle can enter, and a step of winding the coil using this gap. Perform the process of As a result, the inner diameter of the split core during winding work can be reduced while securing the nozzle space equivalent to the conventional one. Therefore, when a plurality of in-phase coils are present, the length of the connecting wires connecting them can be shortened, and the surplus of connecting wires when the cores are assembled can be reduced. As a result, the resistance of the coil is reduced, copper loss is reduced, and motor performance can be improved. Furthermore, it is possible to reduce the risk of the excess crossover wire getting caught when assembling the cores, and it is possible to prevent damage to the coil or disconnection during the assembling work. Furthermore, processing of crossover wires after the cores are assembled becomes easy.

In the above-described coil winding method for a rotating electrical machine, the coils constitute a plurality of energized phases, the plurality of coils belonging to the same phase are connected with a crossover wire, and the divided cores are moved to connect the plurality of energized phases. Form a gap into which the nozzle can enter facing each of the split cores around which a coil is wound, and after winding one of the coils, form the crossover wire and connect the other coils of the same phase. It may be wrapped.

On the other hand, the coil winding jig for a rotating electrical machine of the present invention is a jig for winding a coil around a stator core of a rotating electrical machine, and the stator core has a plurality of divided cores arranged in a ring shape along the circumferential direction. The jig includes a fixing jig having a body formed in a cylindrical shape, and a fixing jig disposed movably along the circumferential direction on the outer periphery of the body of the fixing jig, and the split core a movable jig to which the split core is attached, the fixed jig having a core fixing part that restricts movement in the circumferential direction of the split core attached to the movable jig, and the movable jig having the split core fixed to the movable jig. It has a core attachment part to which a core is attached, and the core attachment part has an outer diameter larger than an inner diameter of the stator core when the split cores are assembled, and the split cores are arranged annularly at equal intervals. In this case, the movable jig has an outer diameter dimension such that a gap is formed between the adjacent split cores into which a nozzle for coil winding cannot enter, and the movable jig has a reference position where the split cores are arranged at equal intervals, and a reference position where the split cores are arranged at equal intervals. It is characterized in that it is movable between a movement position where a gap is formed between the cores into which the nozzle can enter.

In the present invention, a jig for winding a coil around a stator core of a rotating electric machine having a split core structure includes a fixed jig and a movable jig that is movably arranged with respect to the fixed jig and to which the split core is attached. Provide tools and. The fixed jig is provided with a core fixing part that restricts circumferential movement of the split core attached to the movable jig, and the movable jig is provided with a core attachment part to which the split core is attached. The core attachment part has an outer diameter larger than the inner diameter of the stator core when the split cores are assembled, and has an outer diameter dimension that creates a gap between adjacent split cores where nozzles cannot enter when the split cores are arranged at equal intervals. The configuration has the following. Furthermore, the movable jig is movable between a reference position where the divided cores are arranged at equal intervals and a moving position where a gap is formed between the divided cores into which a nozzle can enter. Then, the movable jig is moved in the circumferential direction to form a gap between the divided cores into which the nozzle can enter, and the coil is wound using this gap. As a result, the inner diameter of the split core during winding work can be reduced while securing the nozzle space equivalent to the conventional one. Therefore, when a plurality of in-phase coils are present, the length of the connecting wires connecting them can be shortened, and the surplus of connecting wires when the cores are assembled can be reduced. As a result, the resistance of the coil is reduced, copper loss is reduced, and motor performance can be improved. Further, it is possible to reduce the risk of the excess crossover wire being caught during core assembly, and prevent damage to the coil or wire breakage during the assembly work. Furthermore, processing of crossover wires after the cores are assembled becomes easy.

In the coil winding jig, the core fixing portion includes a pin mounting hole formed in the fixing jig and a core fixing pin inserted into the pin mounting hole, and the core fixing pin is connected to the movable The split core may be brought into contact with a split core attached to a jig to restrict movement of the split core in the circumferential direction.

According to the coil winding method for a rotating electric machine of the present invention, split cores arranged in an annular manner are moved along the circumferential direction, and a gap is formed between the split cores into which a coil winding nozzle can enter. Since the coil is wound around the teeth of the split core using the above method, it is possible to reduce the inner diameter of the split core during winding work while securing the same nozzle space as before. For this reason, for example, when a plurality of in-phase coils are present, it is possible to shorten the length of the connecting wires that connect them, and the surplus of connecting wires when the cores are assembled can be reduced.

Further, according to another coil winding method for a rotating electrical machine of the present invention, in a rotating electrical machine having a split core structure, the split core is arranged in a jig having an outer diameter larger than the inner diameter of the stator core, and the coil is wound therein. In a coil winding method for a rotating electric machine, when the outer diameter of a jig is such that split cores are arranged at equal intervals along the circumferential direction of the jig, a gap is formed between adjacent split cores into which a nozzle cannot enter. Set to dimensions. Then, there is a step of arranging the split cores in a ring shape on this jig, a step of moving the jig in the circumferential direction to form a gap between the split cores through which the nozzle can enter, and a step of winding the coil using this gap. Since this process is carried out, it is possible to reduce the inner diameter of the split core during winding work while securing the nozzle space equivalent to the conventional one. For this reason, for example, when a plurality of in-phase coils are present, it is possible to shorten the length of the connecting wires that connect them, and the surplus of connecting wires when the cores are assembled can be reduced.

On the other hand, according to the coil winding jig for a rotating electrical machine of the present invention, in the jig for winding a coil around the stator core of a rotating electrical machine having a split core structure, the jig is movable with respect to the fixing jig and the fixing jig. A movable jig is provided, and the movable jig is arranged at a reference position where the split cores are arranged at equal intervals and a moving position where a gap through which a nozzle can enter is formed between the split cores. It is possible to move between. Then, by moving the movable jig in the circumferential direction, a gap is created between the split cores through which the nozzle can enter, and this gap is used to wind the coil, ensuring the same nozzle space as before, while still allowing the coil to be wound. It is possible to reduce the inner diameter of the divided cores during line work. For this reason, for example, when a plurality of in-phase coils are present, it is possible to shorten the length of the connecting wires that connect them, and the surplus of connecting wires when the cores are assembled can be reduced.

FIG. 2 is an explanatory diagram showing the configuration of a stator for a rotating electrical machine that employs a split core structure. 1 is a perspective view showing the configuration of a winding jig used in a coil winding process according to the present invention. 3 is an explanatory diagram showing the configuration of the winding jig in FIG. 2, in which (a) shows a cross section of the winding jig, and (b) shows a side view of the winding jig. FIG. 3 is an explanatory diagram showing the configuration of a movable jig in the wire winding jig of FIG. 2. FIG. It is an explanatory view showing a coil winding process according to the present invention. FIG. 2 is an explanatory diagram showing the structure of a cover for preventing scattering of rotor magnets in an inner rotor type motor. FIG. 3 is an explanatory diagram showing a configuration in which a cap is attached to the end of the rotor to prevent interference between the cover and the stator core. It is an explanatory view showing the composition of the crossover wire which connects in-phase coils. FIG. 3 is an explanatory diagram regarding a coil winding method for split cores.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is an explanatory diagram showing the configuration of a stator for a rotating electrical machine that employs a split core structure. Here, an example will be described in which a coil is wound by the winding method of the present invention on a stator used in an inner rotor type brushless motor for an electric power steering device. As shown in FIG. 1, the stator core 1 is composed of nine split cores 2 divided at equal intervals in the circumferential direction, and has a configuration in which a plurality of split cores 2 are assembled in an annular shape. Each split core 2 is formed by laminating core pieces 3 made of electromagnetic steel sheets, and includes an outer circumferential portion 4 and teeth 5 protruding from the outer circumferential portion 4 toward the center. The teeth 5 include an inner circumferential portion 7 facing the rotor 6 and a bridge portion 8 connecting the inner circumferential portion 7 and the outer circumferential portion 4. A coil 9 is wound around the teeth 5, and the coil 9 is housed in a slot 10 formed between adjacent teeth 5. The coils 9 constitute a plurality of energized phases (here, three phases), and the coils 9 belonging to the same phase are connected by a crossover wire 33 (see FIG. 5). Note that a synthetic resin insulator may be attached to the split core 2, and the coil 9 may be wound thereon.

In the winding method of the present invention, the coil 9 is formed on the stator core 1 using the above-mentioned outer winding method. 2 to 4 are explanatory diagrams showing the configuration of a winding jig used in the coil winding process according to the present invention, and FIG. 5 is an explanatory diagram showing the coil winding process according to the present invention. As shown in FIGS. 2 and 3, the winding jig 11 includes a fixing jig 12 and a movable jig 13 that is provided so as to be movable in the circumferential direction relative to the fixing jig 12. In the winding jig 11, the movable jig 13 equipped with the split cores 2 is attached to the fixed jig 12, and the coils 9 are wound around the teeth 5 of each core with the split cores 2 arranged in an annular shape. In the winding method of the present invention, by shifting the movable jig 13 in the circumferential direction, each phase winding is continuously formed while adjusting the gap between adjacent split cores 2 to allow winding. . At this time, the gap between the split cores 2 that are not related to the winding is narrowed, the distance between the cores that perform the winding is shortened, and the length of the crossover wire is made as short as possible.

As shown in FIGS. 2 and 3, the fixing jig 12 includes a cylindrical body 14, disc-shaped flange plates 15a and 15b attached to the top and bottom of the body 14, and each flange plate 15a. , 15b along the circumferential direction. The outer diameters of the flange plates 15a, 15b are larger than the outer diameter of the body 14, and the outer ends of the flange plates 15a, 15b are extended portions 17a, 17b that protrude from the body 14 in the radial direction. It becomes. A space between the upper and lower extending portions 17a and 17b is a space for a movable jig accommodating portion 18 along the circumferential direction. Edge plates 16a, 16b are removably disposed on the outer peripheries of the extensions 17a, 17b, and the upper and lower portions of the movable jig accommodating portion 18 are covered by the edge plates 16a, 16b. Moreover, a plurality of pin attachment holes 19 are provided in the extending portions 17a, 17b of the flange plates 15a, 15b along the circumferential direction as core fixing portions. The pin attachment hole 19 passes through the extensions 17a and 17b in the vertical direction and is in open communication with the movable jig housing section 18.

The movable jig 13 is disposed on the outer periphery of the body portion 14 so as to be movable along the circumferential direction. As shown in FIG. 4, the movable jig 13 is provided with a core mounting portion 21 in the center thereof, to which the split core 2 is mounted. The core mounting portion 21 is a recessed portion surrounded by side walls 22 (22a, 22b) at both ends in the circumferential direction, and a bottom wall 23 at the innermost portion in the radial direction. That is, the core attachment portion 21 of the movable jig 13 has a U-shaped cross section, as shown in FIG. 3(c), and the inner peripheral portion 7 of the split core 2 is attached thereto. The split core 2 mounted on the core mounting part 21 is fixed to the winding in such a way that the center of the inner peripheral part 7 is held down from above and below by the core fixing pin 24 inserted from the pin mounting hole 19 of the fixing jig 12. It is fixed to the tool 11.

The outer diameter dimension φC of the bottom wall 23 in the movable jig 13 is larger than the inner diameter φA of the stator core 1 when the split cores 2 are assembled, and the split cores 2 are arranged at equal intervals on the winding jig 11. When arranged in an annular manner, the dimensions are set such that a gap is formed between adjacent split cores 2 into which the winding nozzle 32 cannot enter. In this case, the dimension φC is smaller than the conventional jig (outer diameter φB: see FIG. 9(b)) (φC<φB).

In the winding jig 11, a movable jig 13 is provided so as to be movable in the circumferential direction with respect to the fixed jig 12. The movable jig 13 is disposed in the movable jig accommodating portion 18 of the fixed jig 12 so as to be movable in the circumferential direction while being restricted from moving in the radial direction by the edge plates 16a, 16b. On the other hand, core fixing pins 24 inserted through pin attachment holes 19 abut on the upper and lower end surfaces of the split core 2 attached to the movable jig 13 . As a result, the movable jig 13 and the split core 2 are fixed at predetermined positions in a state where movement in the circumferential direction is restricted. In this case, the pin attachment holes 19 are arranged at reference positions P provided at equal intervals corresponding to the number of split cores 2, and at movement positions Q and R set at parts left and right at a predetermined angle from this reference position. It is provided.

Here, since there are nine split cores 2, there are nine pin mounting holes 19p at the reference position P, and two pin mounting holes 19q and 19r at the movement positions Q and R on both sides, for a total of 27 holes. A pin mounting hole 19 is provided. Thereby, one movable jig 13 can be fixed at three positions along the circumferential direction corresponding to each pin attachment hole 19p, q, r. Therefore, in the winding jig 11, the split core 2 is disposed around the fixing jig 12 so as to be movable between the reference position P and two moving positions Q and R. In addition, in the winding process of FIG. 5, depending on the split core 2, it may be necessary to move only to one movement position QorR, and some of the pin attachment holes 19q and 19r can be omitted. However, in this embodiment, three pin attachment holes 19p, 19q, and 19r are provided in the fixing jig 12 in consideration of workability and versatility.

The winding method according to the present invention is carried out as follows using such a winding jig 11. Here, first, the movable jig 13 with the split core 2 mounted thereon is attached to the movable jig accommodating portion 18 of the fixed jig 12. At this time, when each split core 2 is arranged at a reference position P as shown in FIG. The dimension becomes G (gap 31a). In addition, in FIG. 5, in order to make the explanation easy to understand, the detailed structure of jigs such as the movable jig 13 is omitted and only the essential parts are shown. Here, the dimensions of the gap 31 depend on the outer diameter of the body portion 14 of the fixing jig 12 and the outer diameter of the core attachment portion 21 (the outer diameter dimension of the bottom wall 23). In order to secure a nozzle operating space, conventionally, the outer diameter of the jig is set to φB, which is larger than the inner diameter φA of the stator, as shown in FIG. 9(b). In this case, the dimension of the gap 31 becomes smaller as the outside diameter of the jig becomes smaller, and as the gap becomes smaller, the distance between the divided cores also becomes smaller, and the connecting wire 33 between the coils of the same phase becomes shorter accordingly.

Therefore, in the winding method of the present invention, a winding jig 11 as shown in FIG. We aim to shorten the time. At that time, since the nozzle 32 cannot enter between the split cores 2 and the winding work cannot be performed, a predetermined split core 2 that is not related to the winding is moved in the circumferential direction and the coil 9 is to be wound thereon. Only the gaps 31 on both sides of the split core 2 are enlarged to enable winding work. For example, when forming a U-phase coil 9U, as shown in FIG. , 2W are moved to movement positions Q and R, respectively. That is, the gap between the split cores 2V and 2W is reduced and minimized, and the gap 31 on both sides of the split core 2U is expanded to a gap F (gap 31b) into which the nozzle 32 can enter, thereby creating a nozzle operating space. Here, the split cores 2V and 2W are brought into contact (=gap 0), and the gap 31 on both sides of the split core 2U is maximized. At this time, the movement and fixation of the split cores 2V, 2W is performed by moving the movable jig 13 attached thereto in the circumferential direction and inserting the core fixing pins 24 into the pin attachment holes 19q, 19r.

By moving the V- and W-phase split cores 2V and 2W in this manner, the gap 31 facing each split core 2U around which the U-phase coil 9U is wound is set to the minimum space in which the nozzle 32 can enter and operate. It is enlarged to dimension F (gap 31b). Then, in this state, the coil 9 is wound around the split core 2 using the nozzle 32, and the U-phase coil 9U is wound in order while connecting the split cores 2U of the same phase with the crossover wire 33U (FIG. 5(b)) ). In this case, the three divided cores 2U are each placed at a reference position P, and the angle between them is 120°. That is, compared to the conventional case shown in FIG. 9(b), the angle between the cores around which the coils are wound is reduced by 2α°. Therefore, the connecting wire 33U between the divided cores 2U also becomes shorter than the conventional one as the inter-core angle is reduced.

After retracting the split cores 2V and 2W as shown in FIG. 5(b) and winding the U-phase coil 9U, next, the V-phase coil 9V is wound. In this case, as shown in Fig. 5(c), the split cores 2U and 2V remain in the same position (same position as when winding the U phase in Fig. 5(b)), and the W-phase split core 2W is moved. It is moved from position R past reference position P to movement position Q. That is, by moving the split core 2W adjacent to the split core 2V to be coil-wound along the circumferential direction, a gap 31b into which the nozzle 32 can enter is formed between the split core 2V and the split cores 2W, 2U. . As a result, the gap 31 on both sides of the split core 2V is expanded to the dimension F. Then, in this state, the coil 9 is wound around the split core 2 using the nozzle 32, and the V-phase coil 9V is sequentially wound while connecting the split cores 2V of the same phase with the crossover wire 33V (FIG. 5(c)) ). Also in this case, the angle between the three divided cores 2V is 120°, and the crossover wire 33V is shorter than in the past. In addition, in FIG. 5(c), the U-phase crossover wire 33U is omitted to make the explanation easier to understand.

After winding the V-phase coil 9V, the W-phase coil 9W is wound. In this case, as shown in FIG. 5(d), the split cores 2V and 2W are left in the same position (same position as when V-phase winding is shown in FIG. 5(c)), and the U-phase split core 2U is set as the reference. Move from position P to movement position Q. As a result, the gap 31 on both sides of the split core 2W is expanded to the dimension F. Then, in this state, the coil 9 is wound around the split core 2 by the nozzle 32, and the W-phase coil 9W is sequentially wound while connecting the split cores 2W of the same phase with the crossover wire 33W (FIG. 5(d)) ). As described above, in this case as well, the angle between the three divided cores 2W is 120°, and the connecting wire 33W is shorter than in the conventional case. Note that the crossover wires 33U and 33V of the U and V phases are also omitted in FIG. 5(d).

After winding the coils 9U, V, and W of each phase in this way, the divided cores 2 that had been moved are each returned to the reference position P, and the winding work is completed. At this time, the divided cores 2 are arranged at intervals of 40°, and the gap 31 between the cores has a narrow dimension G, similar to the state shown in FIG. 5(a). Then, the split cores 2 around which the coils 9 are wound are removed from the winding jig 11 and assembled into a state as shown in FIG. At this time, in the winding method according to the present invention, the outer diameter of the jig, which had been used to widen the inner diameter of the split core 2 in order to secure the operating space of the nozzle, is reduced (φB → φC), while The divided core 2 is made movable. That is, when the split cores 2 have an inner diameter larger than the inner diameter (φA) of the stator core 1 and the split cores 2 are arranged annularly at equal intervals, there is a gap 31 a ( They are arranged in an annular shape with an inner diameter dimension (φC>φA) where the dimension G) is formed. Then, by moving the split core 2 arranged with this inner diameter dimension in the circumferential direction, a gap 31b (dimension F) into which the nozzle 32 can enter is formed.

As a result, the inner diameter of the split core during winding work can be reduced while securing the nozzle space equivalent to increasing the outer diameter of the jig. Therefore, the length of the connecting wire 33 is minimized, making it possible to make the connecting wire 33 shorter than before, and reducing the surplus of connecting wires when the cores are assembled. As a result, the resistance of the coil is reduced, copper loss is reduced, and motor performance can be improved. Furthermore, it is possible to reduce the risk of the excess crossover wire getting caught when assembling the cores, and it is possible to prevent damage to the coil or disconnection during the assembling work. Furthermore, processing of crossover wires after the cores are assembled becomes easy, and depending on the motor specifications, the processing itself can be eliminated.

On the other hand, in an inner rotor type motor, as shown in FIG. 6A, a cover 43 is provided to cover the outer periphery of the magnet 42 to prevent the magnet 42 attached to the rotor 41 from scattering. The cover 43 is formed of a thin heat-shrinkable tube, a thin resin coating (eg, fluororesin), or the like. However, although thin-walled tubes and resin coatings are inexpensive, they are easily damaged, and when the rotor 41 is assembled to the stator 44, they may interfere with the corners of the stator core 45 and be damaged, as shown in FIG. 6(b). It may be stored away. Then, as shown in FIG. 6(c), the scratches may curl up from the cover 43 like a "hangnail" and turn into foreign matter inside the motor, resulting in the motor locking. Such scratches are difficult to detect once the motor is assembled, and cannot be confirmed in advance, so it is necessary to ensure that no scratches occur during assembly.

Therefore, in the motor 46 of FIG. 7A, a cap 47 is provided at the end of the rotor 41 to prevent interference between the cover 43 and the stator core 45. This cap 47 is made of a non-magnetic material such as synthetic resin or stainless steel, and its outer diameter D1 is smaller than the inner diameter D2 of the stator 44, as shown in FIG. The diameter is set larger than the diameter D3 (D2>D1>D3). By attaching such a cap 47 to the rotor 41, even if the rotor 41 is shifted to one side when the rotor 41 is assembled to the stator 44 as shown in FIG. Interference with the stator core 45 can be avoided. Therefore, it is possible to reliably prevent damage to the cover 43 when assembling the motor, and it is possible to prevent problems due to damage or tearing of the cover 43.

It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the gist thereof.
For example, in the embodiments described above, an example was shown in which the present invention was applied to a brushless motor, but it is also possible to apply the present invention to a brushed motor. Furthermore, in the embodiment, an example is shown in which the present invention is applied to a motor with a (6-pole) and 9-slot configuration, but it can also be applied not only to a rotating electric machine with a 2P3S×n configuration but also with other pole/slot configurations. The present invention is applicable.

Furthermore, in the embodiment, as shown in FIG. 8(a), a configuration has been described in which the crossover wire 33 is provided on the same upper side of the coil as the leader wire 34, but the crossover wire 33 may be routed to either the upper or lower side. For example, the present invention is also applicable to a configuration in which the crossover wire 33 is disposed below the coil on the opposite side of the leader wire 34 as shown in FIG. 8(b). In addition, in the winding jig 11, the core fixing pin 24 is used in the core fixing part, and the split core 2 is fixed by the core fixing pin 24. However, it is also possible to use screws instead of the pin. be. In addition, the core fixing pins 24 do not necessarily need to be provided on both the upper and lower sides, but may be provided on at least one of the upper and lower sides.

On the other hand, the position at which the core fixing pin 24 presses the split core 2 may not be at the center of the inner peripheral part 7, but may be at a position shifted to the left or right of the inner peripheral part 7. In that case, it is sufficient to provide the pin attachment hole 19 at one reference position P. That is, when the pin mounting hole 19 is provided only at the reference position P, move the movable jig 13 to positions Q and R, and insert the core fixing pin 24 from the pin mounting hole 19 provided at the reference position P at that position. to fix the split core 2. In this case, the core fixing pin 24 comes into contact with the split core 2 at a position shifted in the circumferential direction from the center of the inner peripheral portion 7 by the amount that the movable jig 13 is shifted. Note that pressing the center of the inner peripheral part 7 with the core fixing pin 24 provides higher stability when winding the coil around the teeth 5, so the configuration of the above-mentioned embodiment is better for coil winding. It is suitable.

Furthermore, the insertion and removal of the core fixing pins 24 can be automated as appropriate; for example, by inserting the core fixing pins 24 into all the pin mounting holes 19 and moving the core fixing pins 24 with a movable jig as necessary. A configuration in which it is pushed into the 13 side is also possible.

The present invention is widely applicable not only to motors for electric power steering devices but also to motors used in electric servo brakes, electric oil pumps, and the like. Moreover, it is also applicable to rotating electric machines other than electric motors, such as generators.

1 Stator core 2 Split core 2U, 2V, 2W Split core 3 Core piece 4 Outer periphery 5 Teeth 6 Rotor 7 Inner periphery 8 Bridge portion 9 Coil 9U U phase coil 9V V phase coil 9W W phase coil 10 Slot 11 Winding jig 12 Fixed jig 13 Movable jig 14 Body parts 15a, 15b Flange plates 16a, 16b Edge plates 17a, 17b Extension part 18 Movable jig housing part 19 Pin mounting hole (core fixing part)
19p, 19q, 19r Pin mounting hole 21 Core mounting part 22a, 22b End wall 23 Bottom wall 24 Core fixing pin (core fixing part)
31 Gap 31a Gap 31b Gap 32 Nozzle 33 Crossover wire 33U, 33V, 33W Crossover wire 34 Lead wire 41 Rotor 42 Magnet 43 Cover 44 Stator 45 Stator core 46 Motor 47 Cap 51 Split core 52 Jig 53 Nozzle 54 Coil 55 Jig 56 Gap 57 Crossover wire D1 Cap outer diameter D2 Stator inner diameter D3 Cover outer diameter F Gap dimension (nozzle can enter)
G Gap dimension (nozzle cannot enter)
P Reference position Q Movement position R Movement position φA Stator core inner diameter φB Jig outer diameter (conventional)
φC Jig outer diameter

Claims (8)

A method for winding a coil in a rotating electric machine including a stator core in which a plurality of divided cores are assembled in an annular shape along the circumferential direction, and a coil is wound around teeth formed in each of the divided cores, the method comprising:
The split cores are arranged in a ring shape,
moving predetermined split cores along the circumferential direction to form a gap between the split cores into which a coil winding nozzle can enter;
A coil winding method for a rotating electric machine, characterized in that the coil is wound around the teeth of the split core using the gap. The coil winding method for a rotating electrical machine according to claim 1,
The split core adjacent to the split core on which the coil is to be wound is moved along the circumferential direction, and the coil winding is performed between the split core to be coil-wound and the moved adjacent split core. A coil winding method for a rotating electrical machine, characterized in that the gap is formed into which a worn nozzle can enter. The coil winding method for a rotating electric machine according to claim 1 or 2,
The divided cores have an inner diameter larger than the inner diameter of the stator core when the divided cores are assembled, and when the divided cores are arranged annularly at equal intervals, the nozzle enters between the adjacent divided cores. Arranged in an annular shape with an inner diameter that creates a gap that cannot be
A coil winding method for a rotating electrical machine, characterized in that the gap into which the nozzle can enter is formed between the split cores by moving the split cores arranged with the inner diameter dimension in the circumferential direction. In the coil winding method for a rotating electrical machine according to any one of claims 1 to 3,
The split core has an outer diameter larger than the inner diameter of the stator core when the split cores are assembled, and when the split cores are arranged annularly at equal intervals, the nozzle is arranged between adjacent split cores. It is attached to a jig having an outer diameter dimension that creates an impenetrable gap,
A coil winding method for a rotating electrical machine, characterized in that by moving the jig in a circumferential direction, the gap into which the nozzle can enter is formed between the divided cores. The divided core of a rotating electric machine including a stator core in which a plurality of divided cores are assembled in an annular shape along the circumferential direction is placed in a jig having an outer diameter larger than the inner diameter of the stator core, and the divided core is placed in a jig having an outer diameter larger than the inner diameter of the stator core, A coil winding method for a rotating electric machine, the method comprising winding a coil around teeth formed in the split core,
The outer diameter of the jig is such that when the split cores are attached to the jig and arranged at regular intervals along the circumferential direction, a gap is formed between adjacent split cores into which a coil winding nozzle cannot enter. is set to
attaching the split cores to the jig and arranging them in an annular manner along the circumferential direction;
forming a gap between the split cores into which the nozzle can enter by moving the jig in the circumferential direction;
A coil winding method for a rotating electrical machine, comprising the step of winding the coil around the teeth using the gap into which the nozzle can enter. In the coil winding method for a rotating electric machine according to any one of claims 1 to 5,
The coils constitute a plurality of energized phases, and the plurality of coils belonging to the same phase are connected by a crossover wire,
By moving the divided cores, forming the gaps into which the nozzles can enter facing each of the divided cores around which the coils of the same phase are wound;
A coil winding method for a rotating electric machine, characterized in that after winding one of the coils, the crossover wire is formed, and another coil of the same phase is wound. A jig for winding a coil around a stator core of a rotating electric machine,
The stator core is made up of a plurality of divided cores gathered together in an annular shape along the circumferential direction,
The jig is
a fixing jig having a cylindrical body;
a movable jig disposed movably along the circumferential direction on the outer periphery of the body of the fixing jig, and to which the split core is attached;
The fixing jig has a core fixing part that restricts circumferential movement of the split core attached to the movable jig,
The movable jig has a core attachment part to which the divided core is attached,
The core mounting portion has an outer diameter larger than an inner diameter of the stator core when the split cores are assembled, and when the split cores are arranged in a ring shape at equal intervals, the core mounting portion has a coil winding between the adjacent split cores. It has an outer diameter dimension that creates a gap that the nozzle for wearing cannot enter,
The movable jig is characterized in that it is movable between a reference position where the split cores are arranged at equal intervals and a movement position where a gap is formed between the split cores into which the nozzle can enter. Jig for coil winding of rotating electric machines. The coil winding jig for a rotating electric machine according to claim 7,
The core fixing part has a pin attachment hole formed in the fixing jig, and a core fixing pin inserted into the pin attachment hole,
A jig for coil winding of a rotating electric machine, wherein the core fixing pin abuts on a split core attached to the movable jig and restricts movement of the split core in a circumferential direction.

Images