JP5453913B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine.

  As a coil constituting a winding body in a rotating electrical machine, there is a distributed winding coil wound around the stator core across a plurality of slots formed in an annular stator core (see, for example, Patent Document 1). .

Japanese Patent No. 4200611

  However, in the coil of Patent Document 1, since the coil end is formed in a mountain shape that is convex along the axial direction of the rotating electrical machine, the coil becomes longer along the axial direction of the rotating electrical machine, and the rotation There is a problem that the length of the electric machine is increased.

  Then, an object of this invention is to suppress that the rotary electric machine by which the coil was distributedly wound becomes long.

In the present invention, the rotating electrical machine includes a plurality of coils that are distributedly wound around the slots of the stator core, and the coils are twisted at coil ends that are spanned between the plurality of slots. The coils arranged adjacent to each other at different positions in the circumferential direction are arranged in such a manner that the coil ends of the coils are aligned with each other and the end portions of the stator core are in the axial direction. It is characterized by being arranged along.

  According to the present invention, since the coil ends are arranged along the axial end surface of the stator core in a state where the twisted portions are along each other, the lengthening of the coil can be suppressed. It is possible to suppress the length of the rotating electrical machine in which the coils are distributedly wound.

It is a block diagram which shows the rotary electric machine concerning one Embodiment of this invention. It is a perspective view which shows a part of stator which concerns on one Embodiment of this invention. It is a schematic diagram which shows a part of stator concerning one Embodiment of this invention seeing from an axial direction one end part side. It is a perspective view which shows the winding body concerning one Embodiment of this invention. The winding body concerning one Embodiment of this invention is shown, (a) is a top view, (b) is a front view, (c) is a side view. It is explanatory drawing for demonstrating the twist structure of the coil | winding body concerning one Embodiment of this invention. It is process drawing which shows the manufacturing process of the coil | winding body concerning one Embodiment of this invention. It is sectional drawing which shows the aligned winding raw material concerning one Embodiment of this invention. It is a schematic diagram which shows a part of stator of the comparative example concerning one Embodiment of this invention seeing from an axial direction one end part side. It is a schematic diagram which shows a part of stator which concerns on the 1st modification of one Embodiment of this invention seeing from an inner peripheral side. It is a mimetic diagram showing a part of stator concerning the 2nd modification of one embodiment of the present invention seeing from the inner circumference side. It is a schematic diagram which shows a part of stator concerning the 3rd modification of one Embodiment of this invention seeing from an axial direction one end part side.

  An embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the rotating electrical machine 1 includes a case 3, a stator 5 housed in the case 3, a rotor 7 housed in the case 3, and a rotating shaft 9 fixed to the rotor 7. And is configured. The rotating electrical machine 1 of the present embodiment is a U-phase, V-phase, and W-phase three-phase rotating electrical machine. The rotor 7 has a cylindrical shape with a rotating shaft 9 disposed in the center. The rotor 7 has a plurality of permanent magnets (not shown) arranged at equal intervals in the circumferential direction on the outer peripheral portion thereof. The rotating shaft 9 is supported by a bearing (not shown) so as to be rotatable with respect to the case 3, whereby the rotor 7 is rotatable with respect to the stator 5. The rotor 7 rotates around the rotation shaft 9 by the reaction force of the permanent magnet generated by the rotating magnetic flux applied from the stator 5.

  As shown in FIGS. 2 and 3, the stator 5 includes an annular core that surrounds the outer periphery of the rotor 7, specifically, a stator core 11 formed in a cylindrical shape, and an inner peripheral portion of the stator core 11. And an annular winding body 13 attached thereto. Here, in FIG.2 and FIG.3, a part of winding body 13 is shown.

  A plurality of slots 11a are formed in the inner peripheral portion of the stator core 11 at regular intervals along the circumferential direction, and tooth portions 11b are formed between adjacent slots 11a.

  The winding body 13 has a plurality of coils 15 distributedly wound around the slots 11a. A plurality of coils 15 are provided for each of a plurality of phases (U-phase, V-phase, W-phase), and coils 15 of the same phase are arranged every predetermined number (specifically, two) in the circumferential direction. Has been.

  Each coil 15 is formed by aligned winding as shown in FIGS. 4 and 5, and as shown in FIGS. 2 and 3, three slots arranged continuously in the circumferential direction of the stator 5. 11a is wound. The coil 15 has a pair of coil ends 15a and 15b spanned between a plurality of (three in this embodiment) slots 11a. A lead wire 15c extends from one coil end 15a of the coil 15, and coils 15 of the same phase are connected in series via the lead wire 15c.

  The coil 15 has a plurality of twisted portions 15d formed by twisting at the coil ends 15a and 15b. In the present embodiment, the number of twisted portions 15d in one coil end 15a or 15b is an integral multiple of two, and in the present embodiment, the number is two. That is, in the present embodiment, the coil 15 is formed with four twisted portions 15d, and when distinguishing these four twisted portions 15d, the first to fourth twisted portions 15e, 15f, 15g, 15h. That's it.

  The first to fourth torsion portions 15e, 15f, 15g, and 15h are formed along the circumferential direction of the coil 15 in this order, and the first and second torsion portions 15e and 15f are one coil end 15a. The third and fourth twisted portions 15g and 15h are formed on the other coil end 15b. In addition, the twist angle of each twisted portion 15d is approximately 180 degrees, that is, the top and bottom of the conducting wire 17 constituting the coil 15 are reversed at the twisted portion 15d. A step is formed in the coil ends 15a and 15b by a twisted portion 15d, and an intermediate portion 15i formed between the twisted portions 15d in the coil ends 15a and 15b is fixed as another part of the coil ends 15a and 15b. It is separated from the axial end surface 11c of the stator core 11 rather than both end portions 15j in the circumferential direction of the core 5. As shown in FIGS. 4 and 5, the coil 15 has the twist direction of the twisted portion 15d opposite to each other at one coil end 15a and the other coil end 15b. Specifically, in the present embodiment, the first and second twisted portions 15e and 15f of the coil end 15a on one side (leader line 15c side) are viewed from one side of the coil 15 (FIG. 5C). ) While being twisted counterclockwise, the third and fourth twisted portions 15g and 15h of the other coil end 15b are clockwise when viewed from one side of the coil 15 (FIG. 5 (c)). Twisted.

  2 and 6, the coil ends 15 a and 15 b are arranged along the axial end surface 11 c of the stator core 11 with the twisted portions 15 d extending along each other. It is installed. Specifically, the coils 15 are assembled to each other with their twisted portions 15d along each other, and the coil ends 15a (coil ends 15b) of the plurality of coils 15 are the stator cores 11. Are arranged in a laminated state on the axial end face 11c. At this time, the coil ends 15 a and 15 b of the coil 15 adjacent to the coil 15 are fixed between the intermediate portion 15 i of the coil ends 15 a and 15 b of a certain coil 15 and the axial end surface 11 c of the stator core 11. An end 15j in the circumferential direction of the child 5 is located. That is, the vertical relationship between the coil ends 15a (coil ends 15b) of one coil 15 and the adjacent coil 15 is reversed via the twisted portion 15d.

  Further, the portion 15m of the coil ends 15a and 15b beyond the slot 11a is different from the coil 15 having the coil ends 15a and 15b and is disposed beyond the coil 15 inserted into the slot 11a. As an example, a portion 15m of the coil ends 15a and 15b of the coil 15B in FIG. 2 that exceeds the slot 11aA is different from the coil 15B having the coil ends 15a and 15b, and the coils 15A and 15C inserted in the slot 11aA It is arranged beyond.

  Next, a method for manufacturing the winding body 13 will be described. As shown in FIG. 7A, the coil 15 is formed of an annular aligned winding material 19. In the present embodiment, as shown in FIG. 8, the aligned winding material 19 is configured by aligning and winding the conductor wires 17 such as copper wires having a square cross section subjected to insulating surface treatment in an array of 2 rows and 4 columns. The ratio of the width a in the radial direction and the width b in the direction perpendicular to the radial direction of the aligned winding material 19 is approximately 1: 2. In the manufacture of the winding body 13, the aligned winding material 19 is first attached to a plurality of jigs 21 (FIG. 7B). And after forming the twist part 15d by rotating the predetermined jig | tool 21 (FIG.7 (c)), the alignment winding raw material 19 is shape | molded in a rectangular shape (FIG.7 (d)). Thereby, the coil 15 is formed. Here, in FIG. 7, the twisted portion 15 d is schematically indicated by “x”, and a step due to the twisted portion 15 d is also omitted. Next, the coil 15 is inserted into the slot 11a of the stator core 11, and the coil 15 next to the coil 15 is inserted into the slot 11a so that the twisted portions 15d of these coils 15 are aligned. The coils 15 are assembled with each other in the state (FIG. 7E). The winding body 13 is completed by sequentially performing this operation along the circumferential direction of the stator core 11.

  As described above, in this embodiment, the coils 15 are arranged along the axial end surface 11c of the stator core 11 with the coil ends 15a and 15b being in a state in which the twisted portions 15d are along each other. Therefore, compared with the case where the coil end is formed in a mountain shape that is convex along the axial direction of the rotating electrical machine 1, the length of the coil 15 can be suppressed. It is possible to suppress the length of the distributedly wound rotating electrical machine 1 from becoming longer. Moreover, according to this embodiment, since it is not necessary to weld the coil ends 15a and 15b, the coil ends 15a and 15b can be further reduced in size.

  In this embodiment, since the coil 15 is formed by aligned winding, the occupation ratio of the coil 15 in the slot 11a can be made equal to that of concentrated winding. Further, the coils 15 are arranged along the axial end surface 11c of the stator core 11 with their coil ends 15a (coil ends 15b) in a state where the twisted portions 15d thereof are along each other. Unnecessarily closing the slot 11a of the stator core 11 can be suppressed. Here, in the comparative example shown in FIG. 9, the coil ends 115 a of the coils 115 of the winding body 113 are arranged so as to be shifted in the radial direction of the stator core 111, so that the slots 111 a of the stator core 111 are not used. As a result, the occupancy of the coil 115 in the slot 111a decreases.

  In the present embodiment, the coil 15 is wound over three slots 11a that are continuously arranged in the circumferential direction of the stator 5, and a twisted portion 15d in one coil end 15a, 15b. Since the number of the coils is 2, the size of the coil 15 can be minimized as the distributed winding coil 15, and the miniaturization effect of the coil ends 15a and 15b can be further increased.

  In the present embodiment, the twist angle of the twisted portion 15d is 180 degrees. Here, when the twist angle of the twisted portion 15d is other than 180 degrees, the upper and lower sides of the conducting wire 17 at the coil ends 15a and 15b are not completely reversed, so that the coil end is changed according to the amount of deviation of the twist angle from 180 degrees. Although 15a and 15b will become large, in this embodiment, since the twist angle of the twist part 15d is 180 degree | times as above-mentioned, the size reduction effect of the coil ends 15a and 15b can be enlarged more.

  Moreover, in this embodiment, the coil 15 is formed from the annular | circular shaped aligned winding raw material 19, and the ratio of the width a of the radial direction a and the width | variety b of a direction orthogonal to a radial direction of the aligned winding raw material 19 is about 1 :. Therefore, when the two coil ends 15a (or 15Bb) are combined, the combined cross section becomes a substantially square. Here, when the cross section combining the two coil ends 15a (or 15Bb) is rectangular, the height of the portion combining the coil ends 15a (or 15Bb) is increased or the width is increased. In this embodiment, since the cross section obtained by combining the two coil ends 15a (or 15Bb) is substantially square, the effect of reducing the size of the coil ends 15a and 15b can be further increased.

  In the present embodiment, in the coil 15, the twist direction of the twisted portion 15d is opposite between the one coil end 15a and the other coil end 15b. Here, depending on the twisting direction of the twisted portion 15d, the 90 ° twisted portion 15k (FIG. 3B), which is a portion twisted by 90 ° in the twisted portion 15d, is located on the back side of the slot 11a (the radial direction of the stator core 11) Thus, it is determined whether it is the rear side with respect to the center of the stator core 11 or the inlet side of the slot 11a (the front side with respect to the center of the stator core 11 in the radial direction of the stator core 11). In the operation of inserting the coil 15 into the slot 11a, the 90 ° twisted portion 15k in the twisted portion 15d is inserted into the slot 11a first, and then the 90 ° twisted portion 15k in the twisted portion 15d. However, it can be performed smoothly by inserting the coil 15 on the near side of the slot 11a and assembling the coils 15 together. In order to realize this, it is necessary that the twist direction of the torsion part 15d is reversed between the one coil end 15a and the other coil end 15b. In the present embodiment, as described above, the torsional direction of the torsion part 15d is reversed between the one coil end 15a and the other coil end 15b, so that the assembling property of the coil 15 can be improved.

  Next, a modification of this embodiment will be described.

  In the winding body 213 of the first modification shown in FIG. 10, the twisting direction of the torsion part 15 d is opposite to that of the torsion part 15 d of the winding body 13. Specifically, the first and second twisted portions 15e and 15f are twisted clockwise as viewed from one side of the coil 15, while the third and fourth twisted portions 15g and 15h are The coil 15 is twisted counterclockwise when viewed from one side. The coil 15 of the winding body 213 and the coil 15 of the winding body 13 are sequentially assembled to the stator core 11 in the reverse direction. According to the first modified winding body 213, similarly to the winding body 13, only one type of the coil 15 may be used, so that the coil 15 can be easily managed.

  The winding body 313 of the second modification shown in FIG. 11 is configured by alternately assembling first coils 15D and second coils 15E. In the first coil 15D, the torsion directions of the first torsion part 15e and the second torsion part 15f are opposite, and the torsion directions of the third torsion part 15g and the fourth torsion part 15h are opposite. The torsion directions of the first torsion part 15e and the third torsion part 15g are the same, and the torsion directions of the second torsion part 15f and the fourth torsion part 15h are the same. On the other hand, in the second coil 15E, the twist directions of the first twist portion 15e and the second twist portion 15f are opposite, and the twist directions of the third twist portion 15g and the fourth twist portion 15h are opposite. The torsion directions of the first torsion part 15e and the third torsion part 15g are the same, and the torsion directions of the second torsion part 15f and the fourth torsion part 15h are the same. The second coil 15E differs from the first coil 15D in that the torsion direction of the first torsion part 15e and the third torsion part 15g is clockwise when viewed from one side of the coil 15. On the other hand, the twisting directions of the second twisted portion 15f and the fourth twisted portion 15h are twisted counterclockwise when viewed from one side of the coil 15. In the winding body 313 having such a structure, after all the first coils 15D are inserted into the slots 11a, the second coils 15E are inserted into the slots 11a so that the first coils 15D and the second coils 15E are connected to each other. As a result, the coils 15 are connected to each other. Therefore, according to the winding body 313 of the second modified example, the assembly can be performed relatively easily.

  The winding body 413 of the third modification shown in FIG. 12 is different from the winding body 13 in that the twisting angle of the twisted portion 15d of the coil 15 is 90 degrees. According to such a configuration, although the occupation ratio of the coil 15 in the slot 11a is lower than that in the case where the twist angle of the twisted portion 15d is 180 degrees, the conventional distributed winding is reduced in size. Can do. Further, in this configuration, since there is an extra space in the slot 11a every other slot 11a, it is possible to apply the space to the cooling fluid passage.

  The present invention is not limited to the above embodiment, and various other embodiments can be adopted without departing from the gist of the present invention. For example, the arrangement of the aligned winding is not limited to the arrangement of 2 rows and 4 columns, but may be other arrangements.

DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine 5 ... Stator 7 ... Rotor 11 ... Stator iron core 11a ... Slot 11c ... End surface 15 (15A, 15B, 15C), 15D, 15E ... Coil 15a, 15b ... Coil end 15d (15e, 15f , 15g, 15h) ... torsion part

Claims (8)

A stator having an annular stator core in which a plurality of slots are provided along a circumferential direction and a plurality of coils wound around the slots;
A rotor rotatable with respect to the stator;
In a rotating electrical machine comprising:
The coil has a twisted portion formed by twisting at a coil end spanned between the plurality of slots,
The coils that are arranged at different positions in the circumferential direction and are adjacent to each other are arranged such that the coil ends of the coils are arranged along the axial end surface of the stator core in a state in which the torsional portions are along each other. A rotating electric machine characterized by   The portion of the coil end beyond the slot is different from the coil having the coil end and is disposed beyond the coil inserted into the slot. Rotating electric machine.   The rotating electrical machine according to claim 1, wherein the coil is formed by aligned winding.   4. The rotating electrical machine according to claim 1, wherein the number of the twisted portions in one coil end is an integral multiple of two. 5. The coil is wound over three slots arranged continuously in the circumferential direction of the stator,
5. The rotating electrical machine according to claim 1, wherein the number of the twisted portions in one coil end is two.   The rotating electrical machine according to any one of claims 1 to 5, wherein a twist angle of the twist portion is 180 degrees. The coil is formed from an annular aligned winding material,
The ratio of the width in the radial direction and the width in the direction perpendicular to the radial direction of the aligned wound material formed in an annular shape is approximately 1: 2, as described above. The rotating electrical machine according to any one of the above.   8. The rotating electrical machine according to claim 1, wherein the torsional direction of the torsion part is opposite between the one coil end and the other coil end. 9.

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