JP2010178562A - Interlayer insulating paper and axial gap type motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide interlayer insulating paper that facilitates assembly operation, by improving the efficiency of interlayer insulating-paper inserting operation between coils and enabling an interlayer insulation, without fail, by preventing the positional displacement of the interlayer insulating paper in a post-process and an axial gap type motor. <P>SOLUTION: The interlayer insulating paper 30 is formed in a mutually substantially concentric circle shape, having a diameter smaller than the inside diameter of a stator core 23 and larger than the outside diameter of the stator core. The interlayer insulating paper includes two insulations 31 and 32 that conduct interlayer insulation among the coil ends 25a, 26a and 27a and 25b, 26b and 27b of the coils 25, 26 and 27 for each phase; and connections 33 connecting the two insulations 31 and 32 in the radial direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an interphase insulating paper and an axial gap type motor that are inserted between coils of a stator core of an axial gap type motor to insulate the coils of a plurality of phases.

  A plurality of phase coils (stator windings) in which a coil conductor is overlapped and wound in each slot of the stator core are inserted in the stator of the motor. Interphase insulating paper is inserted between the transition portions of the coils (referred to as bent portions protruding from the stator, hereinafter referred to as “coil ends”) to insulate the coils of each phase. Conventionally, as such interphase insulating paper, as shown in FIG. 16, it has a donut shape having an inner diameter corresponding to the inner diameter of the stator core 101, and forms a predetermined angle with respect to the radial direction from the outer periphery to the inner periphery. An interphase insulating paper 100 provided with a notch 102 is known (for example, see Patent Document 1). The interphase insulating paper 100 described in Patent Document 1 is an insulating paper of a radial gap type motor, and is sandwiched between coil ends of the coils 103 and 104 so that the overlapping portion 105 is surely formed when deformed from a planar shape to a cylindrical shape. Therefore, a device has been devised to make it difficult for insulation failure to occur.

  Further, interphase insulating paper composed of a pair of belt-like portions and a pair of connecting portions for connecting the belt-like portions is used, and a pair of paper grippers are used to grip the vicinity of both ends and rotate and displace both ends of the predetermined core of the stator core. A method and apparatus for inserting interphase insulating paper is disclosed in which the connecting portion is inserted into the slot after being aligned in the slot direction (see, for example, Patent Document 2).

JP-A-8-275425 JP-A-5-260707

  However, the interphase insulating papers described in Patent Documents 1 and 2 are both used for radial gap type motors. Further, in Patent Document 2, insulation between coils is performed by a plurality of interphase insulating papers, and one interphase insulating paper is inserted into each portion where the coil ends of the different phase coils are in contact with each other. For this reason, a lot of time was required for inserting the interphase insulating paper, and there was a problem in work efficiency. In addition, there is a possibility that the interphase insulating paper may be misaligned during a subsequent process such as racing, and there is room for improvement in improving the reliability of interphase insulation.

  The present invention has been made in view of the above-described problems, and the object thereof is to improve the efficiency of interphase insulating paper insertion work between coils to facilitate assembly work, and further, interphase insulating paper in a later process. It is an object of the present invention to provide an interphase insulating paper and an axial gap type motor that can prevent the positional deviation of each other and reliably insulate the phases.

In order to achieve the above object, the invention according to claim 1 is provided with a permanent magnet (for example, a main magnet portion 12a and a sub magnet portion 12b in an embodiment described later), and a rotor (for example, rotatable around a rotation axis). , A rotor 11) in a later-described embodiment, a stator core (for example, a stator core 23 in a later-described embodiment) in which a plurality of slots (for example, a slot 24 in a later-described embodiment) are formed in the circumferential direction, and the plurality of slots A plurality of phase coils (for example, a U-phase coil 25, a V-phase coil 26, and a W-phase coil 27 in the embodiments described later), and are arranged to face the rotor from at least one of the rotation axis directions. An axial gap motor (e.g., an embodiment described later). A interphase insulator for insulating between definitive of each phase of the stator of the axial gap motor 10) coils (e.g., phase insulating paper 30 in the embodiment to be described later),
The stator core has a smaller diameter than the inner diameter and a larger diameter than the outer diameter, and is formed in a substantially concentric shape with each other. The inner diameter side and outer diameter side coil ends of the coils of each phase (for example, 26b, 27b and outer-diameter side coil ends 25a, 26a, 27a), and two insulating parts (for example, inner-diameter-side insulating part 32 and outer part in an embodiment described later) for interphase insulation between the coil ends. Diameter-side insulating portion 31),
A connecting portion that connects the two insulating portions in the radial direction (for example, a connecting portion 33 in an embodiment described later);
It is characterized by providing.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, at least one of the circumferential surfaces opposed to each other in the radial direction of the two insulating portions has a plurality of stresses that relieve the tensile stress acting on the insulating portion. A relaxation portion (for example, a slit 34 in an embodiment described later) is provided.

  The invention according to claim 3 is characterized in that, in addition to the configuration of claim 2, the stress relaxation portion is a slit formed along a radial direction.

  According to a fourth aspect of the invention, in addition to the configuration of the third aspect, the number of slits is the same as the number of slots of the stator core.

  The invention according to claim 5 is characterized in that, in addition to the configuration of claim 3 or 4, the base portion of the slit is substantially equal to a radial position near a stator core of a portion extending in the circumferential direction of the coil end.

According to a sixth aspect of the present invention, in addition to the structure of any one of the first to fifth aspects, the connecting portion is formed wider than the circumferential width of the slot, so that the rotational positioning portions are provided on both sides in the circumferential direction. (For example, the rotation direction positioning portion 36 in the embodiment described later)
The connecting portion is folded into a substantially U-shaped cross section and inserted into the slot, and the rotational direction positioning portion contacts the both side surfaces of the slot, thereby positioning the rotational position with respect to the stator core. Features.

According to a seventh aspect of the present invention, in addition to the configuration of any one of the first to sixth aspects, on both sides in the circumferential direction of the connecting portion, there is a radial length capable of contacting the circumferential surface of the stator core. A radial positioning portion (for example, a radial positioning portion 37 in an embodiment described later) extending in a radial direction from the insulating portion,
The radial positioning portion is in contact with the peripheral surface of the stator core while being bent, and positions the radial position with respect to the stator core.

  The invention according to claim 8 is characterized in that, in addition to the configuration of any one of claims 1 to 7, the connecting portion is formed in a wavy shape on both side surfaces in the circumferential direction.

  The invention according to claim 9 is characterized in that, in addition to the configuration of any one of claims 1 to 8, the connecting portion includes a weakened portion having a mechanical strength weaker than other portions of the connecting portion. To do.

  The invention according to claim 10 is characterized in that, in addition to the configuration of claim 9, the weakened portion is a perforation.

  According to an eleventh aspect of the invention, in addition to the configuration of the ninth aspect, the fragile portion is a narrow portion having a width dimension smaller than that of the other portion.

  According to a twelfth aspect of the present invention, in addition to the configuration of the ninth aspect, the fragile portion is an adhesive portion in which tips of the joint portions that are cut off in the middle are bonded to each other.

  The invention according to claim 13 is an axial gap type motor, comprising a permanent magnet, a rotor rotatable around a rotation axis, a stator core formed with a plurality of slots in the circumferential direction, and inserted into the plurality of slots A plurality of phase coils, and the interphase insulating paper according to any one of claims 1 to 12, and a stator disposed to face the rotor from at least one of the rotation axis directions. It is characterized by.

In the invention according to claim 14, in addition to the configuration of claim 13, the multiple-phase coil is a combination of a U-phase coil, a V-phase coil, and a W-phase coil,
A plurality of the interphase insulating papers are arranged in the axial direction in a state where the phases of the connecting portions are shifted in the circumferential direction, and perform interphase insulation between the coil ends.

  According to the first aspect of the present invention, the outer diameter side coil end and the inner diameter side coil end can be insulated by one interphase insulating paper, and the work efficiency of inserting the interphase insulating paper is greatly improved. In addition, since the interphase insulating paper has a circular shape, misalignment is unlikely to occur in subsequent processes such as lacing, and highly reliable interphase insulation is performed, and the whole moves even if misalignment occurs. Therefore, occurrence of misalignment can be easily determined.

  According to invention of Claim 2 and 3, the tensile stress which acts on an insulation part at the time of racing can be eased, and the fracture | rupture in two insulation parts can be prevented. This also makes it possible to achieve highly reliable interphase insulation.

  According to invention of Claim 4 and 5, the tensile stress which generate | occur | produces in each coil end can be relieve | moderated effectively by a slit, and the fracture | rupture in an insulation part can be prevented.

  According to the invention of claim 6, the rotational direction position of the interphase insulating paper with respect to the stator core is reliably positioned by the rotational direction positioning part provided in the connecting part. This prevents a phase shift in which the interphase insulating paper rotates during operation, and can reliably insulate the coils from one another.

  According to the seventh aspect of the present invention, the interphase insulating paper is positioned in the radial direction with respect to the stator core by the radial positioning portion of the connecting portion. It is possible to insulate the gaps reliably.

  According to the eighth to twelfth aspects of the present invention, when a tensile stress acts on the joint portion, the stress is reduced by being cut, and the influence on other portions of the interphase insulating paper such as the insulating portion can be prevented.

  According to the invention of claim 13, the interphase insulating paper is hardly displaced by inserting one interphase insulating paper between the coils of each phase, and the interphase insulation with high reliability is performed and the assembly is performed. Can be obtained.

  According to the invention of claim 14, the connecting portions are not arranged in the same slot, and a reduction in the space factor of the coil arranged in the slot is prevented.

1 is an overall perspective view of an axial gap type motor according to the present invention. It is a disassembled perspective view of the rotor of FIG. It is a front view of a stator. FIG. 4 is a perspective view of the outer diameter side of the stator shown in FIG. 3. FIG. 4 is a perspective view of an inner diameter side of the stator shown in FIG. 3. (A) is a front view of the interphase insulating paper which concerns on this invention, (b) is the principal part enlarged view. It is sectional drawing cut | disconnected along the VII-VII line of FIG. It is a front view of a stator in which a U-phase coil and a V-phase coil are inserted together with interphase insulating paper. It is an outer diameter side perspective view of the stator shown in FIG. It is an internal diameter side perspective view of the stator shown in FIG. FIG. 9 is a front view of the stator showing a state in which interphase insulating paper is placed on the stator shown in FIG. 8 in which a U-phase coil and a V-phase coil are inserted. It is a front view of the interphase insulating paper of the 1st modification of this embodiment. It is sectional drawing corresponding to FIG. 7 of the axial gap type motor to which the interphase insulating paper which concerns on 2nd Embodiment of this invention was applied. It is a front view of the interphase insulating paper which concerns on 3rd Embodiment of this invention. FIG. 15 is a partially broken perspective view of a stator that is phase-insulated by the phase-insulating paper shown in FIG. 14. (A) is a front view of the conventional interphase insulating paper, (b) is a partially broken perspective view showing a state in which the coil is interphase insulated by the interphase insulating paper.

  Hereinafter, an interphase insulating paper and an axial gap type motor according to an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the axial gap type motor 10 includes a substantially annular rotor 11 provided to be rotatable around a rotation axis O, and both sides in an axial direction of the rotation axis O (hereinafter simply referred to as an axial direction). And a pair of stators 20 and 20 each having a plurality of coils (stator windings) arranged opposite to each other so as to sandwich the rotor 11 therebetween.

  As shown in FIG. 2, the rotor 11 includes a plurality of main magnet portions 12a,..., 12a made of permanent magnets, a plurality of sub magnet portions 12b,..., 12b, a plurality of yoke portions 13,. And a rotor frame 14 made of a magnetic member.

  Each stator 20 has a substantially annular plate-shaped yoke portion 21 and a diameter toward the rotor 11 along the axial direction from a circumferentially spaced position on the facing surface of the yoke portion 21 facing the rotor 11. .., 22 projecting in the direction, and a plurality of phases (which are inserted into slots 24 defined by appropriate adjacent teeth 22, 22 and generate a rotating magnetic field that rotates the rotor 11 ( U-phase, V-phase, and W-phase) coils 25, 26, and 27 (see FIG. 3).

As shown in FIGS. 3 to 5, each stator 20 is a 6N type having six main poles (U ⁺ , V ⁺ , W ⁺ , U ⁻ , V ⁻ , W ⁻ ). A U-phase coil 25, a V-phase coil 26, and a W-phase coil 27 are inserted in the slot 24. Interphase insulating paper 30 (30A, 30B) is inserted between the U-phase coil 25 and the V-phase coil 26 and between the V-phase coil 26 and the W-phase coil 27, respectively. The interphase insulating papers 30A and 30B, the outer diameter side coil ends 25a, 26a, and 27a of the coils 25, 26, and 27 and the inner diameter side coil ends 25b, 26b, and 27b are bound by a racing yarn 28, respectively.

In such a 6N type stator 20, each U ⁻ , V ⁻ , W ⁻ pole of the other stator 20 is opposed to each U ⁺ , V ⁺ , W ⁺ pole of one stator 20 in the axial direction. Set to do. For example, three teeth 22 of one stator 20 corresponding to one of U ⁺ , V ⁺ , W ⁺ poles and one of U ⁻ , V ⁻ , W ⁻ poles with respect to a pair of stators 20, 20 opposed in the axial direction. , 22, 22, and three teeth 22, 22, 22 of the other stator 20 corresponding to the other of the U ⁺ , V ⁺ , W ⁺ pole and the other of the U ⁻ , V ⁻ , W ⁻ pole, The energized state with respect to the teeth 22 of one stator 20 and the teeth 22 of the other stator 20 facing each other in the axial direction is set so as to be reversed by an electrical angle.

  As shown in FIG. 6, the interphase insulating paper 30 (30 </ b> A, 30 </ b> B) includes an outer diameter side insulating portion 31 having an outer diameter D larger than the outer diameter of the stator core 23, and an inner diameter d smaller than the inner diameter of the stator core 23. The inner diameter side insulating portion 32 and the inner diameter side insulating portion 32 are arranged substantially concentrically, and the outer diameter side insulating portion 31 and the inner diameter side insulating portion 32 are arranged in the radial direction by the connecting portions 33 provided at four locations in the circumferential direction (90 ° intervals). Are integrally formed.

  The peripheral surfaces facing each other in the radial direction of the outer diameter side insulating portion 31 and the inner diameter side insulating portion 32, that is, the inner peripheral surface of the outer diameter side insulating portion 31 and the outer peripheral surface of the inner diameter side insulating portion 32, are stress relaxation portions. A plurality of slits 34 are formed in the radial direction. The same number of slits 34 as the slots 24 of the stator core 23 are provided. The base 34a of the slit 34 is substantially equal to the radial position of the circumferential portions 25c, 26c, 27c extending in the circumferential direction of the coil ends 25a, 26a, 27a, and 25b, 26b, 27b near the stator core 23. . The slit 34, which is a stress relaxation part, is formed when the interphase insulating paper 30 is bound by the lacing yarn 28 together with the coil ends 25a, 26a, 27a and 25b, 26b, 27b of the coils 25, 26, 27 of each phase. The tensile stress acting on the diameter side insulating part 31 and the inner diameter side insulating part 32 is relaxed.

  As shown also in FIG. 7, the connecting portion 33 is disposed on the bottom surface of the slot 24 via a slot cell 40 described later made of insulating paper formed in a substantially U shape and inserted into the slot 24. In the present embodiment, the connecting portion 33 determines the thickness t of the slot cells 40 on both sides contacting the side surfaces of the slot 24 from the circumferential width Wa of the slot 24, that is, the side surfaces of the teeth 22 defining the slot 24. The width W is set slightly narrower than the subtracted value (Wa-2 × t).

  As shown in FIGS. 8 to 10, the stator 20 is assembled by first inserting the slot cells 40 into the slots 24 of the stator core 23. As shown in FIGS. 9 and 10, the slot cell 40 includes a U-shaped portion 40a formed in a substantially U shape so as to be in contact with both side surfaces of the slot 24, and both end edges in the radial direction of the portion 40a. And a cuff part 40b folded back toward the end surface of the core. Next, the U-phase coil 25 wound in another process is inserted into the slot 24 through the slot cell 40. At this time, the outer diameter side coil end 25 a of the U phase coil 25 protrudes toward the outer diameter side of the stator core 23, and the inner diameter side coil end 25 b of the U phase coil 25 protrudes toward the inner diameter side of the stator core 23.

  The U-phase coil 25 inserted in the stator core 23 has an outer-diameter-side insulating portion 31 placed on the outer-diameter-side coil end 25a and an inner-diameter-side insulating portion 32 placed on the inner-diameter-side coil end 25b. Insulating paper 30A is arranged. The four connecting portions 33 of the interphase insulating paper 30A are inserted into the slots 24 into which the V-phase coils 26 are inserted. Thereby, the interphase insulating paper 30 </ b> A is positioned with respect to the stator core 23.

  Next, the V-phase coil 26 wound in the separate process is inserted into the slot 24 from above the connecting portion 33 of the interphase insulating paper 30A inserted into the slot 24 in the previous process. Thereby, the outer diameter side insulating portion 31 is inserted between the outer diameter side coil end 25a of the U phase coil 25 and the outer diameter side coil end 26a of the V phase coil 26, and the inner diameter side coil of the U phase coil 25 is also inserted. An inner diameter side insulating portion 32 is inserted between the end 25 b and the inner diameter side coil end 26 b of the V phase coil 26, and the U phase coil 25 and the V phase coil 26 are insulated from each other.

  Next, as shown in FIG. 11, the interphase insulating paper 30 </ b> B is inserted on the outer diameter side coil end 26 a of the V phase coil 26 by inserting the connecting portion 33 into the slot 24 in which the W phase coil 27 is inserted. The insulating portion 31 is placed, and the inner diameter side insulating portion 32 is placed on the inner diameter side coil end 26b. Then, the W-phase coil 27 wound in a separate process is inserted into the slot 24 from above the connecting portion 33 of the interphase insulating paper 30 </ b> B inserted into the slot 24.

  As a result, the outer diameter side insulating portion 31 is inserted between the outer diameter side coil end 26 a of the V phase coil 26 and the outer diameter side coil end 27 a of the W phase coil 27, and the inner diameter side coil of the V phase coil 26. The inner diameter side insulating portion 32 is inserted between the end 26b and the inner diameter side coil end 27b of the W phase coil 27, and the V phase coil 26 and the W phase coil 27 are insulated from each other by the interphase insulating paper 30B.

  The outer diameter side coil ends 25 a, 26 a, 27 a and the inner diameter side coil ends 25 b, 26 b, 27 b of the coils 25, 26, 27 are bound by the racing yarn 28. At this time, the tensile stress due to the lacing yarn 28 also acts on the interphase insulating paper 30, but since the position where the lacing yarn 28 extends substantially coincides with the slit 34, the tensile stress due to the lacing yarn 28 is relieved by the slit 34. Thus, the influence on the outer diameter side insulating portion 31 and the inner diameter side insulating portion 32 is minimized.

  As described above, according to the interphase insulating paper 30 according to the present embodiment, the stator core 23 has a smaller diameter than the inner diameter and a larger diameter than the outer diameter, and is formed in a substantially concentric shape with the coil ends 25a, 26a, 27a, and The outer diameter side and inner diameter side insulating parts 31 and 32 for interphase insulation of 25b, 26b and 27b, and the connecting part 33 for connecting the outer diameter side and inner diameter side insulating parts 31 and 32 in the radial direction are provided. The diameter side coil ends 25a, 26a, 27a and the inner diameter side coil ends 25b, 26b, 27b can be insulated by one sheet of interphase insulating paper 30, and the work efficiency of inserting interphase insulating paper is greatly improved. In addition, since the interphase insulating paper 30 has a circular shape, misalignment is unlikely to occur in a later process such as racing, and reliable interphase insulation is performed. Therefore, it is possible to easily determine the occurrence of misalignment.

  Moreover, the inner peripheral surface of the outer diameter side insulating portion 31 and the outer peripheral surface of the inner diameter side insulating portion 32 that are opposed to each other in the radial direction are provided with a plurality of stress relaxation portions 34 and act on the insulating portions 31 and 32 during racing. The tensile stress can be relaxed, and the breakage at the two insulating portions 31 and 32 can be prevented. Thereby, highly reliable interphase insulation is attained.

  Specifically, since the stress relaxation portion 34 is a slit 34 formed along the radial direction, the tensile stress generated in the interphase insulating paper 30 during racing can be relaxed by the slit 34. As a result, it is possible to improve the insulation reliability by preventing breakage at the insulating portions 31 and 32.

  Further, since the slits 34 are provided in the same number as the number of slots 24 of the stator core 23, by arranging the interphase insulating paper 30 so that the positions of the slits 34 and the slots 24 are aligned, the coil ends 25a, 26a, 27a, And the tensile stress which generate | occur | produces in 25b, 26b, 27b can be relieve | moderated effectively by the slit 34, and the fracture | rupture in the insulation parts 31 and 32 can be prevented.

  Further, the base 34a of the slit 34 is at a position substantially equal to the radial position of the coil ends 25a, 26a, 27a, and the circumferential portions 25c, 26c, 27c of the coil ends 25a, 26b, 27b near the stator core 23. The tensile stress generated at the coil ends 25a, 26a, 27a and 25b, 26b, 27b can be effectively relaxed by the slits 34, and the breakage at the insulating portions 31, 32 can be prevented.

  Note that the plurality of slits 34 that are stress relaxation portions may be formed on at least one of the inner peripheral surface of the outer diameter side insulating portion 31 and the outer peripheral surface of the inner diameter side insulating portion 32. Or the structure which does not have a slit may be sufficient as the interphase insulating paper 30 like the modification of this embodiment shown in FIG.

  Further, according to the axial gap type motor 10 according to the present embodiment, the coil ends 25a, 26a, 27a, and 25b, 26b are formed so as to be smaller than the inner diameter and larger than the outer diameter of the stator core 23 and are substantially concentric with each other. 27b, the interphase insulating paper 30 having two insulating portions 31 and 32 that perform interphase insulation between the two insulating portions 31 and 32, and a connecting portion 33 that connects the two insulating portions 31 and 32 in the radial direction, includes coil ends 25a for each phase, It is inserted between 26a, 27a and 25b, 26b, 27b. As a result, it is possible to obtain the axial gap type motor 10 in which the interphase insulating paper 30 is hardly displaced, the interphase insulation is performed with high reliability, and the assembly is easy.

  Furthermore, the axial gap type motor 10 has a plurality of phases including a U-phase coil 25, a V-phase coil 26, and a W-phase coil 27, and the phase of the interphase insulating paper 30 is shifted in the circumferential direction. As a result, the connecting portions 33 are not arranged in the same slot 24, and the space factor of the coils 25, 26, 27 arranged in the slot 24 is arranged in the axial direction. Will not drop.

  FIG. 13 is a cross-sectional view corresponding to FIG. 7 of the axial gap type motor to which the interphase insulating paper 30 according to the second embodiment of the present invention is applied. The connecting portion 33 of the interphase insulating paper 30 has a width wider than the circumferential width Wa of the slot 24, and the connecting portion 33 is folded into a substantially U-shaped cross section and inserted into the slot 24. The rotational direction positioning part 36 which contacts both side surfaces is configured.

  With this configuration, the rotational direction position of the interphase insulating paper 30 with respect to the stator core 23 is reliably positioned. This prevents a phase shift in which the interphase insulating paper 30 rotates during work, and can reliably insulate the coil ends 25a, 26a, 27a and 25b, 26b, 27b of the coils 25, 26, 27 from each other. .

  FIG. 14 is a front view of the interphase insulating paper 30 according to the third embodiment of the present invention, and FIG. 15 is a partially broken perspective view of the stator interphase insulated by the interphase insulating paper 30 shown in FIG. In this interphase insulating paper 30, on both sides in the circumferential direction of the connecting portion 33, there are radial positioning portions 37 having a radial length capable of contacting the peripheral surface of the stator core 23 and extending in the radial direction from the insulating portions 31, 32. Is formed. As shown in FIG. 14, the interphase insulating paper 30 is inserted into the slot 24 by bringing the radial positioning portion 37 into contact with the peripheral surface 29 of the stator core 23 while being bent.

  With this configuration, the radial position of the interphase insulating paper 30 with respect to the stator core 23 is positioned, so that the radial displacement of the interphase insulating paper 30 is prevented, and the coils 25, 26, 27 are reliably interphased. Can be insulated.

  Note that the present invention is not limited to the above-described embodiments and modifications, and modifications and improvements can be made as appropriate.

  For example, the connecting portion 33 is provided with a weak portion having a weaker mechanical strength than other portions of the connecting portion 33, and when excessive tensile stress acts on the interphase insulating paper 30 during the operation, the weak portion is positively cut. You may make it relieve a tensile stress. As a result, the influence on the outer diameter side insulating part 31, the inner diameter side insulating part 32 and the like can be suppressed, and the insulation reliability is improved.

  Further, the connecting portion 33 is for improving the work efficiency of the insertion work by integrally forming the interphase insulating paper 30. For example, even if the connecting portion 33 is cut during racing, the connecting portion 33 has U Since only one phase coil of the phase, V phase, and W phase exists, the interphase insulation is not affected.

  As such a weak part, you may be provided by forming the circumferential direction both sides | surfaces of a connection part in a wavy shape, and you may provide a perforation in the connection part 33. FIG. Alternatively, the fragile portion can be a narrow portion whose width direction dimension is smaller than that of other parts, or an adhesive portion where the tips of the connecting portions that are cut off in the middle are bonded together. Can be formed.

  The order of the U-phase, V-phase, and W-phase coils inserted into the slot 24 can be arbitrarily set. Further, a combination of U-phase, V-phase, and W-phase coils may be arranged a plurality of times so that coils of the same phase are arranged in the same slot. In either case, one sheet of interphase insulating paper is inserted between the coils.

10 Axial gap type motor 11 Rotor 12a Main magnet part (permanent magnet)
12b Secondary magnet part (permanent magnet)
20 Stator 23 Stator core 24 Slot 25 U-phase coil (coil)
25a, 26a, 27a Outer diameter side coil end (coil end)
25b, 26b, 27b Inner diameter side coil end (coil end)
25c, 26c, 27c Circumferential portion 26 V-phase coil (coil)
27 W-phase coil (coil)
29 Stator core peripheral surface 30 (30A, 30B) Interphase insulating paper 31 Outer diameter side insulating portion (insulating portion)
32 Inner diameter side insulation (insulation)
33 Connecting part 34 Slit (stress relaxation part)
34a Slit base portion 36 Rotational direction positioning portion 37 Radial direction positioning portion O Rotational axis W Width of connecting portion Wa Slot width in the circumferential direction

Claims (14)

A rotor having a permanent magnet and rotatable about a rotation axis, a stator core formed with a plurality of slots in the circumferential direction, and a plurality of coils inserted into the plurality of slots, the rotation axis direction Interphase insulating paper that insulates between the coils of each phase of the stator of an axial gap type motor comprising: a stator disposed opposite to the rotor from at least one of
The stator core is smaller in diameter than the inner diameter and larger in diameter than the outer diameter, and is formed in a substantially concentric shape with each other. Two insulation parts for
A connecting portion for connecting the two insulating portions in the radial direction;
Interphase insulation paper characterized by comprising.   2. The interphase insulation according to claim 1, wherein at least one of the circumferential surfaces facing each other in the radial direction of the two insulating portions includes a plurality of stress relaxation portions that relieve a tensile stress acting on the insulating portion. paper.   The interphase insulating paper according to claim 2, wherein the stress relaxation portion is a slit formed along a radial direction.   4. The interphase insulating paper according to claim 3, wherein the number of the slits is the same as the number of slots of the stator core.   5. The interphase insulating paper according to claim 3, wherein a base portion of the slit is substantially equal to a radial position near a stator core of a portion extending in a circumferential direction of the coil end. The connecting portion has a rotation direction positioning portion on both sides in the circumferential direction by forming wider than the circumferential width of the slot,
The connecting portion is folded into a substantially U-shaped cross section and inserted into the slot, and the rotational direction positioning portion contacts the both side surfaces of the slot, thereby positioning the rotational position with respect to the stator core. The interphase insulating paper according to any one of claims 1 to 5, characterized in that: On both sides in the circumferential direction of the connecting portion, a radial positioning portion extending in the radial direction from the insulating portion having a radial length capable of contacting the circumferential surface of the stator core is provided.
The interphase insulating paper according to any one of claims 1 to 6, wherein the radial positioning portion contacts the circumferential surface of the stator core while being bent, and positions the radial position with respect to the stator core.   The interphase insulating paper according to any one of claims 1 to 7, wherein the connecting portion is formed in a wavy shape on both sides in the circumferential direction.   The interphase insulating paper according to any one of claims 1 to 8, wherein the joint portion includes a fragile portion whose mechanical strength is weaker than other portions of the joint portion.   The interphase insulating paper according to claim 9, wherein the fragile portion is a perforation.   The interphase insulating paper according to claim 9, wherein the fragile portion is a narrow portion having a width dimension smaller than that of the other portion.   10. The interphase insulating paper according to claim 9, wherein the fragile portion is an adhesive portion in which tips of the joint portions that are cut off in the middle are bonded to each other. A rotor having a permanent magnet and rotatable about a rotation axis;
A stator core having a plurality of slots formed in a circumferential direction, a plurality of coils inserted into the plurality of slots, and the interphase insulating paper according to any one of claims 1 to 12, wherein the rotating shaft is provided. A stator disposed to face the rotor from at least one of the directions;
An axial gap type motor comprising: The multi-phase coil is a combination of a U-phase coil, a V-phase coil, and a W-phase coil,
14. The axial according to claim 13, wherein a plurality of the interphase insulating papers are arranged in the axial direction in a state where the phases of the respective connecting portions are shifted in the circumferential direction to perform interphase insulation between the coil ends. Gap type motor.

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