JP2006109672A - Method for assembling stator for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the manufacturing cost of an annular stator body of a motor stator. <P>SOLUTION: A plurality of stator pieces 38 are disposed at an inner portion of a casing 37 having a first flange 37b protruded at one edge in the axial direction of a cylindrical circumferential wall 37a inward in the radial direction so as to go along the inner surface of the circumferential wall 37a, and then a second flange 37c facing the first flange 37b is tightened at the other end in the axial direction of the circumferential wall 37a of the casing 37 with a bolt 39. The plurality of stator pieces 38 are compressed by the first and second flanges 37b, 37c in the axial direction, to support the plurality of stator pieces 38 outward in the diametrical direction to bring it into contact with an inner surface of the circumferential wall 37a, thus constituting the annular stator body so as to rigidly and integrally form the plurality of stator pieces 38 is made possible. Also providing reduction in the manufacturing cost, by reducing the size of a forming die and improving ease of process compared to the case in which the stator body is constituted of a single member is made possible. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for assembling a stator of a motor including a plurality of stator pieces obtained by dividing an annular stator body in a circumferential direction.

A conventional stator of a motor is composed of a stator main body made of a laminated steel plate in which a large number of steel plates punched into a predetermined shape are laminated in the axial direction, and windings wound around the stator main body (for example, the following patent document) 1). Further, instead of a stator body made of a laminated steel plate, a stator body made of a compacted material is also known, which is obtained by mixing a fine magnetic powder with a binder such as a resin and press-molding it.
Japanese Patent Publication No. 5-56100

  By the way, the stator body has a complicated shape in which a plurality of teeth are protruded in a radial direction from an annular stator core and a slot for accommodating a winding is formed between adjacent teeth. If it is to be configured with a single member, a large and complicated molding die is required, which causes a problem of cost increase.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to make it possible to manufacture an annular stator body of a motor stator at a low cost.

  To achieve the above object, according to the first aspect of the present invention, there is provided a method for assembling a stator of a motor comprising a plurality of stator pieces obtained by dividing an annular stator body in a circumferential direction, and having a cylindrical shape. Arranging a plurality of stator pieces along the inner surface of the peripheral wall in the casing having a first flange protruding radially inward at one axial end of the peripheral wall of the peripheral wall, and the other axial end of the peripheral wall of the casing The second flange facing the first flange is fastened to the first flange, and the first and second flanges compress the plurality of stator pieces in the axial direction, thereby urging the plurality of stator pieces outward in the radial direction. And a method for assembling the stator of the motor.

  According to the invention described in claim 2, in addition to the configuration of claim 1, all or part of the plurality of stator stator pieces has a pair of tapered surfaces tapered in the opposite axial direction. When the plurality of stator pieces are compressed in the axial direction by the first and second flanges, the tapered surfaces of the stator stator pieces are brought into close contact with each other to generate the radially outward biasing force. A method for assembling the stator of the motor is proposed.

  According to a third aspect of the present invention, there is provided a method for assembling a motor stator comprising a plurality of stator pieces obtained by dividing an annular stator body in the circumferential direction, wherein the plurality of stator pieces are arranged in an annular shape. A step of fitting a fixing ring having a slit with a part cut in a circumferential direction to the outer peripheral surface of a plurality of stator pieces arranged in an annular shape, and a plurality of tightening to narrow the width of the slit of the fixing ring And a method for assembling the stator of the motor.

  According to the invention described in claim 4, in addition to the configuration of claim 3, all or a part of the plurality of stator stator pieces has a pair of tapered surfaces tapered in the opposite axial direction. When a plurality of stator pieces are tightened with a fixing ring, the stator pieces are aligned in the axial direction and the tapered surfaces are brought into close contact with each other, so that the outer peripheral surface of each stator piece is pressed against the fixing ring in the radially outward direction. A method for assembling a stator of a motor is proposed, which is characterized by generating a force.

  According to the fifth aspect of the invention, in addition to the configuration of the fourth aspect, due to the contact between the inclined surface formed on the outer peripheral surface of the plurality of stator stator pieces and the inclined surface formed on the fixing ring, A method for assembling a stator of a motor is proposed, which generates an urging force for aligning the stator pieces in the axial direction.

  According to a sixth aspect of the present invention, in addition to the configuration of any one of the first to fifth aspects, the plurality of stator pieces have the same shape, and the stator of the motor is characterized in that An assembly method is proposed.

  According to the invention described in claim 7, in addition to the structure of any one of claims 1 to 6, the plurality of stator pieces are made of a dust material. A method for assembling the stator is proposed.

  According to an eighth aspect of the present invention, in addition to the structure of the first aspect, at least two stator bodies are laminated in the axial direction inside the casing. A method is proposed.

  Note that the stator core 31, the teeth 32, the U-phase stator ring 51, the V-phase stator ring 52, and the W-phase stator ring 53 of the embodiment correspond to the stator body of the present invention.

  According to the configuration of the first aspect, the plurality of stator pieces are arranged along the inner surface of the peripheral wall in the casing having the first flange protruding radially inward at one axial end of the cylindrical peripheral wall. Later, the second flange opposite the first flange is fastened to the other axial end of the peripheral wall of the casing, and the plurality of stator pieces are compressed in the axial direction by the first and second flanges. Since it is urged radially outward and pressed against the inner surface of the peripheral wall, a plurality of stator stator pieces can be firmly integrated to form an annular stator body. Further, as compared with the case where the stator main body is constituted by a single member, the molding die can be reduced in size and workability can be improved, and the manufacturing cost can be reduced.

  According to the configuration of the second aspect, since all or a part of the plurality of stator pieces has a pair of tapered surfaces tapered in the opposite axial direction, the plurality of stator pieces are pivoted by the first and second flanges. When compressed in the direction, the tapered surfaces of the stator pieces are brought into close contact with each other to generate a radially outward biasing force, and the stator force can be brought into close contact with the inner surface of the peripheral wall of the casing.

  According to the configuration of claim 3, a plurality of stator pieces are arranged in an annular shape, and then a fixing ring having a slit cut in a circumferential direction is fitted to the outer peripheral surface of the plurality of stator pieces, Since the plurality of stator pieces are integrated by tightening so as to narrow the width of the slit of the fixing ring, the annular stator body can be configured by firmly integrating the plurality of stator pieces. Further, as compared with the case where the stator main body is constituted by a single member, the molding die can be reduced in size and workability can be improved, and the manufacturing cost can be reduced.

  According to the configuration of claim 4, since all or a part of the plurality of stator pieces has a pair of tapered surfaces tapering in the opposite axial direction, when the plurality of stator pieces are tightened with the fixing ring, When the stator pieces are aligned in the axial direction and the tapered surfaces are in close contact with each other, it is possible to generate a radially outward urging force that presses the outer peripheral surface of each stator piece against the fixing ring.

  According to the configuration of claim 5, since the inclined surface formed on the outer peripheral surface of the plurality of stator pieces and the inclined surface formed on the fixing ring are in contact with each other, an urging force that aligns the stator pieces in the axial direction is generated. By simply tightening the plurality of stator pieces with the fixing ring, it is possible to generate a radially outward urging force that presses the outer peripheral surface of each stator piece against the fixing ring.

  According to the structure of Claim 6, since all the several stator pieces were made into the same shape, processing cost can be reduced compared with the case where several types of stator pieces from which a shape differs are manufactured.

  According to the structure of Claim 7, since the several stator piece was comprised with the compacting material, the stator piece of a complicated shape can be manufactured at low cost compared with cutting or casting.

  According to the configuration of the eighth aspect, since at least two stator main bodies are laminated in the axial direction inside the casing, a plurality of stator main bodies can be combined and firmly integrated.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 to 9 show a first embodiment of the present invention. FIG. 1 is a diagram showing a power unit of a hybrid vehicle equipped with a three-phase motor. FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG. 3 is an enlarged sectional view of part 3 in FIG. 2, FIG. 4 is a view taken along line 4-4 in FIG. 3, FIG. 5 is a partially broken perspective view of the stator body, and FIG. FIG. 7 is an exploded perspective view of the stator, FIG. 8 is an explanatory view of the operation when the stator piece is assembled, and FIG. 9 is a schematic view corresponding to FIG.

  As shown in FIG. 1, the power unit of the hybrid vehicle includes a three-phase motor M disposed between the engine E and the transmission T. A motor case 13, a torque converter case 14, and a transmission case 15 are coupled to the right side surfaces of the cylinder block 11 and the crankcase 12 of the engine E, and the shaft end of the crankshaft 16 supported between the cylinder block 11 and the crankcase 12. The rotor 17 of the motor M is fixed to the motor. An annular stator 19 is opposed to a plurality of permanent magnets 18 fixed to the outer periphery of the rotor 17 via a predetermined air gap, and the stator holder 20 that supports the stator 19 is connected to the cylinder block 11, the crankcase 12, and the motor case. 13 is fixed by being sandwiched between the split surfaces.

  The torque converter 21 housed in the torque converter case 14 includes a turbine runner 22 and a pump impeller 23, and a side cover 24 that is coupled to the turbine runner 22 and covers the pump impeller 23 is connected to the motor M via the drive plate 25. Connected to the rotor 17. The pump impeller 23 of the torque converter 14 is coupled to the left end of the main shaft 26 supported by the transmission case 15.

  Next, the structure of the stator 19 of the motor M will be described with reference to FIGS.

  The stator 19 of the motor M is formed between an annular stator core 31, a plurality (24 in the embodiment) of teeth 32... Projecting radially inward from the inner peripheral surface of the stator core 31, and the teeth 32. A U-phase winding 34, a V-phase winding 35, and a W-phase winding 36 that are wave-wound so as to pass through the slots 33, and a casing 37 (see FIG. 7) that covers the periphery of the stator core 31. The stator body composed of the stator core 31 and the teeth 32... Is configured by combining 24 stator pieces 38.

  As best shown in FIG. 7, the stator body of this embodiment is configured by combining 24 stator stator pieces 38 having the same shape. Each stator piece 38 has a generally wedge shape cut at the center plane of the slot 33, and each stator piece 38 includes one tooth 32. Each stator piece 38 has a pair of tapered surfaces 38a, 38a inclined in opposite directions with respect to the direction of the axis L, and the tapered surfaces 38a, 38a of the adjacent stator pieces 38 are in close contact with each other.

  The casing 37 that integrally holds the 24 stator pieces 38 is a cylindrical peripheral wall 37a, a first flange 37b that integrally extends radially inward from one end in the axial line L direction, the axial L direction of the peripheral wall 37a, and the like. The second flange 37c is detachably fixed to the end by a plurality of bolts 39. The height L1 in the axis L direction of the peripheral wall 37a of the casing 37 is set equal to the height L2 in the axis L direction of the stator pieces 38.

  When the second flanges 37c are fastened to the end surfaces of the peripheral walls 37a opposite to the first flanges 37b with the bolts 39 in a state where the respective stator pieces 38 are annularly arranged along the inner surface of the peripheral wall 37a of the casing 37, As shown in FIG. 8, the stator pieces 38 are sandwiched between the first and second flanges 37b and 37c and aligned in the axis L direction. At that time, the axis L direction received from the first and second flanges 37b and 37c When the taper surfaces 38a of the stator pieces 38 are in close contact with each other with the load F1, a load F2 in the circumferential direction is generated. This load F2 not only biases the stator stator pieces 38 in the circumferential direction but also biases them radially outward, so that the stator pieces 38 are pressed against the inner surface of the peripheral wall 37a and are firmly integrated.

  At this time, the first and second flanges 37b and 37c are in contact with the stator core 31 on the radially outer side of the stator body and do not contact with the teeth 32 on the radially inner side of the stator body. The U-phase winding 34, the V-phase winding 35, and the W-phase winding 36 that are wave-wound so as to pass through the slots 33 do not interfere with the first and second flanges 37b and 37c.

  In this way, the stator 19 completed by wave winding the U-phase winding 34, the V-phase winding 35, and the W-phase winding 36 into the casing 37 in which the stator pieces 38 are integrated, The stator block 20 is fixed to the outer periphery of the peripheral wall 37a so as to be sandwiched and fixed between the cylinder block 11, the crankcase 12, and the motor case 13 (see FIG. 1).

  The teeth 32 as viewed in the radial direction are isosceles triangles and taper in the direction of the axis L, and twelve slots 33 formed between adjacent teeth 32 are alternately reversed with respect to the direction of the axis L. Skewed in the direction. The skew angle of the slots 33 is an electrical angle, for example, 60 °.

  The U-phase winding 34 is wave-wound so as to pass through three slots 33... Separated by three in the circumferential direction. At this time, the winding of the U-phase winding 34 has a direction indicated by a solid line and a direction indicated by a chain line in FIG. 9, but the transition portion of the U-phase winding 34 exposed at both end faces in the axis L direction of the teeth 32. The direction indicated by the solid line is employed so that 34a.

  The V-phase winding 35 is wave-wound so as to pass through slots 33, which are shifted by 1 pitch in the circumferential direction with respect to the U-phase winding 34, and the W-phase winding 36 is circumferential with respect to the V-phase winding 35. Waves are wound so as to pass through the slots 33. The V-phase winding 35 and the W-phase winding 36 are also wound in a direction in which their transition portions 35a,. In FIG. 6, one of each of the U-phase, V-phase, and W-phase windings 34, 35, and 36 is shown.

  As described above, since the slots 33 of the stator 19 are skewed, generation of torque ripple and abnormal harmonic torque due to the slots 33 can be suppressed, and the motor M can be smoothly rotated. Since all the slots 33 are alternately skewed in the opposite direction with respect to the direction of the axis L, the lengths of the crossover portions 34a, 35a, 36a are shortened as shown by solid lines in FIG. The resistance of the wires 35, 36 is reduced, and the b portions at both ends of the transition portions 34a, 35a, 36a are bent at an obtuse angle to facilitate winding of the windings 34, 35, 36, and the transition portions 34a, 35a, 36a. The height H of the stator 19 in the direction of the axis L can be reduced to reduce the size of the stator 19 in the direction of the axis L.

  Further, when the slots 33 of the stator 19 are skewed to suppress the generation of torque ripple and abnormal harmonic torque caused by the slots 33, the skew coefficient is reduced and the torque of the motor M is reduced. However, the transition portions 34a, 35a, 36a are reduced. The above-described decrease in torque can be compensated for by reducing the resistance of the windings 34, 35, and 36 and increasing the number of turns of the windings 34, 35, and 36 due to the decrease in the length of the winding.

  Further, by using a dust material for the stator body comprising the stator core 31 and the teeth 32, a stator body having a complicated shape can be easily formed, and a plurality of stator pieces 38 having the same shape are assembled. Therefore, the molding die can be reduced in size and workability can be improved compared to the case where the stator body is molded with a single member, thereby contributing to cost reduction.

  10 to 12 show a second embodiment of the present invention. FIG. 10 is a partially broken perspective view of the stator, FIG. 11 is a sectional view taken along line 11-11 of FIG. 10, and FIG. FIG.

  In the first embodiment, the plurality of stator pieces 38 are accommodated in the casing 37 and integrated. However, in the second embodiment, the plurality of stator pieces 38 are integrated using the fixing ring 41. The plurality of stator pieces 38 have the same shape as in the first embodiment, but a trapezoidal protrusion 38b having two inclined surfaces P and P is provided in the center of the outer peripheral surface in the axis L direction. The The protrusions 38b extend in the circumferential direction of the stator pieces 38, and surround the outer peripheral surface of the stator body in an annular shape when the plurality of stator pieces 38 are assembled.

  The fixing ring 41 made of an elastic body is a member fitted to the outer peripheral surface of the stator body, and a pair of fastening portions 41b and 41b project so as to sandwich a slit 41a formed by cutting one circumferential direction. The width of the slit 41 a can be reduced by fastening these fastening portions 41 b and 41 b with bolts 42 and nuts 43. An annular groove 41c having a trapezoidal cross section is formed on the inner peripheral surface of the fixing ring 41. When the annular groove 41c is engaged with the protrusions 38b of the stator piece 38, the two inclined surfaces P, P contacts the two inclined surfaces Q and Q of the annular groove 41c.

  In assembling the stator body, the fixing ring 41 is mounted on the outer peripheral surface of the plurality of stator pieces 38 arranged in an annular shape, and the bolts 42 are engaged with the annular grooves 41c engaged with the projections 38b of the stator pieces 38. When the nut 43 is tightened so as to narrow the width of the slit 41a, the tapered surfaces 38a of the plurality of stator pieces 38 are brought into close contact with each other and integrated.

  Since the stator pieces 38 are engaged with each other via the tapered surfaces 38a, when the fixing ring 41 receives a radially inward tightening force, the tapered surfaces 38a are formed as shown in FIG. The stator pieces 38 try to protrude alternately in the direction of the axis L by sliding, but the two inclined surfaces Q, Q of the annular groove 41c of the fixing ring 41 are two inclined surfaces P of the projections 38b of the stator piece 38,. As shown in FIG. 12B, a load is generated that aligns the plurality of stator pieces 38 in the direction of the axis L as shown in FIG. 12B, thereby urging the stator pieces 38 outward in the radial direction. The stator main body can be configured to be tightly integrated with the inner peripheral surface of 41.

  Thus, the second embodiment can achieve the same effects as those of the first embodiment described above.

  FIGS. 13 to 15 show a third embodiment of the present invention. FIG. 13 is a partially broken perspective view of the stator, FIG. 14 is a sectional view taken along the line 14-14 of FIG. 13, and FIG. FIG.

  The third embodiment is a modification of the second embodiment and differs from the second embodiment in the shape of the projections 38c projecting from the outer peripheral surface of the stator pieces 38. That is, the stator piece 38 of the second embodiment is provided with a trapezoidal protrusion 38b at the center in the direction of the axis L of the outer peripheral surface, whereas the stator piece 38 of the third embodiment is provided with the axis of the outer peripheral surface. Triangular protrusions 38c are provided on the tapered side in the L direction. The fixing ring 44 itself has a trapezoidal cross section, and the inclined surfaces Q and Q can be engaged with the inclined surfaces P and P of the projections 38c of the stator stator piece 38.

  Therefore, when assembling the stator body, the fixing ring 44 is attached to the outer peripheral surface of the plurality of annularly arranged stator pieces 38, and the fixing ring 44 is engaged with the projections 38c of the stator piece 38. When the bolts 42 and the nuts 43 are tightened so as to narrow the width of the slits 44a, the tapered surfaces 38a of the plurality of stator pieces 38 are brought into close contact with each other and integrated.

  Since the stator pieces 38 are engaged with each other via the tapered surfaces 38a, when the fixing ring 44 receives a radially inward tightening force, the tapered surfaces 38a are formed as shown in FIG. The stator pieces 38 try to protrude alternately in the direction of the axis L by sliding, but the two inclined surfaces Q and Q of the fixing ring 44 come into contact with the two inclined surfaces P and P of the projections 38c of the stator piece 38. As shown in FIG. 15B, a load for aligning the plurality of stator pieces 38 in the direction of the axis L is generated, thereby urging the stator pieces 38 outward in the radial direction and The stator main body can be configured in close contact with the surface and firmly integrated.

  Therefore, also according to the third embodiment, it is possible to achieve the same effect as the second embodiment described above.

  Next, a fourth embodiment of the present invention will be described with reference to FIG.

  The fourth embodiment relates to a stator 19 of a three-phase claw pole type motor, and the stator 19 is divided into a U-phase stator ring 51, a V-phase stator ring 52 and a W-phase stator ring 53, each of which is formed of a dust material. One U-phase winding 54, two first and second V-phase windings 55A and 55B, and one W-phase winding 56 are provided. The U-phase stator ring 51, the V-phase stator ring 52, and the W-phase stator ring 53 are overlapped in the axis L direction.

  The U-phase stator ring 51 includes an annular return path 51a, a plurality of U-phase teeth 51b extending radially inward from circumferentially equidistant positions of the return path 51a, and the U-phase teeth 51b. Are further provided with a plurality of protrusions 51c extending inward in the radial direction from the radially inner end. The radially inner end of each protrusion 51c is bent in an L shape and extends to one side in the axis L direction while the radial height decreases from the proximal end side toward the distal end side. The U-phase teeth 51b are portions corresponding to the radial heights of the windings 54, 55A, 55B, and 56, and the radially inner portion is a protrusion 51c.

  The V-phase stator ring 52 includes an annular return path 52a, a plurality of V-phase teeth 52b extending radially inward from circumferentially equidistant positions of the return path 52a, and these V-phase teeth 52b. Are further provided with a plurality of protrusions 52c extending inward in the radial direction from the radially inner end. The radially inner ends of the protrusions 52c are bent in a T shape and extend in both directions in the axis L direction while the radial height decreases from the proximal end side to the distal end side in a tapered shape. The V-phase teeth 52b are portions corresponding to the radial heights of the windings 54, 55A, 55B, and 56, and the radially inner portion is a protrusion 52c.

  The W-phase stator ring 53 is a mirror-symmetric member with respect to the U-phase stator ring 51 with respect to the V-phase stator ring 52, and has the same shape that can be interchanged with the U-phase stator ring 51 by turning it over. The reference numerals of the respective parts of the W-phase stator ring 53 are obtained by changing “51” of the reference numerals of the respective parts of the U-phase stator ring 51 to “53”.

  The motor M of this embodiment operates with three-phase alternating current, and the U-phase, V-phase, and W-phase protrusions 51c, 52c,..., 53c, are electrical angles of 360 ° / 3 = 120 ° in the circumferential direction. They are shifted.

  An annular slot is formed between the U-phase teeth 51b of the U-phase stator ring 51 and the V-phase teeth 52b of the V-phase stator ring 52, and a U-phase winding 54 wound around the annular slot in advance. The first V-phase winding 55A is housed. An annular slot is formed between the W-phase teeth 53b of the W-phase stator ring 53 and the V-phase teeth 52b of the V-phase stator ring 52, and a W-phase winding 56 wound in advance in the annular slot. And the second V-phase winding 55B are housed.

  The U-phase stator ring 51 is divided into a plurality of U-phase stator pieces 57 tapered in the axis L direction, and the V-phase stator ring 52 is divided into a plurality of V-phase stator pieces 58 tapered in the axis L direction. The W-phase stator ring 53 is divided into a plurality of W-phase stator pieces 59 that taper in the direction of the axis L. At this time, the plurality of V-phase stator pieces 58 of the V-phase stator ring 52 located at the center all have the same shape, but the plurality of U-phase stator pieces of the U-phase stator ring 51 located at one end. 57 (the same applies to the plurality of W-phase stator pieces 59 of the W-phase stator ring 53 located at the other end) is composed of two types of members having different taper directions.

  Thus, a U-phase stator ring 51 in which a plurality of U-phase stator pieces 57 are arranged in an annular shape, a U-phase winding 54 and a first V-phase winding 55A, and a plurality of V-phase stator pieces 58 in an annular shape. The arranged V-phase stator ring 52, the W-phase winding 56 and the second V-phase winding 55B, and the W-phase stator ring 53 in which a plurality of W-phase stator pieces 59 are annularly arranged are laminated in the direction of the axis L. 7 is housed in the casing 37 shown in FIG. 7 and sandwiched between the first and second flanges 37b and 37c, so that a U-phase stator piece 57, a V-phase stator piece 58, and a W-phase stator piece 59 are provided. Can be urged radially outward and pressed against the peripheral wall 37a of the casing 37 to be firmly integrated.

  According to the fourth embodiment, the same effects as those of the first to third embodiments described above can be achieved.

  Although the embodiments of the present invention have been described above, various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the motor M is used as a traveling motor for a hybrid vehicle, but the application is arbitrary.

  The motor M of the embodiment is an inner rotor type in which the rotor 17 is disposed inside the stator 19, but the present invention can also be applied to an outer rotor type motor in which the rotor is disposed outside the stator.

  Moreover, although the stator piece 38 ... of an Example is comprised with the dust material, the material is arbitrary.

  Further, the U-phase stator ring 51, the V-phase stator ring 52, and the W-phase stator ring 53 of the claw pole type motor of the fourth embodiment are respectively integrated using the fixing ring 41 of the second embodiment or the third embodiment. be able to.

  Further, it is not necessary that all the stator pieces 38 have a wedge shape. As shown in the fifth embodiment of FIG. 17, a wedge-shaped stator piece 38 (1) having a different taper direction and a parallelogram-shaped stator piece 38 ( Even if 2) is used in combination, the same effect can be achieved.

Diagram showing the power unit of a hybrid vehicle equipped with a three-phase motor 2-2 line enlarged sectional view of FIG. 3 is an enlarged sectional view of part 3 in FIG. 4-4 arrow view of FIG. Partially broken perspective view of stator body The figure which shows the relationship between the slot and winding of the stator body Disassembled perspective view of stator Action explanatory diagram when assembling the stator piece Schematic diagram corresponding to FIG. Partially broken perspective view of stator according to second embodiment 11-11 sectional view of FIG. Action explanatory diagram when assembling the stator piece Partially broken perspective view of stator according to third embodiment 14-14 sectional view of FIG. Action explanatory diagram when assembling the stator piece Partially exploded perspective view of stator according to fourth embodiment The schematic diagram which shows arrangement | positioning of the stator piece which concerns on 5th Example

Explanation of symbols

31 Stator core (stator body)
32 teeth (stator body)
37 casing 37a peripheral wall 37b first flange 37c second flange 38 stator piece 38a taper surface 41 fixing ring 41a slit 44 fixing ring 44a slit 51 U-phase stator ring (stator body)
52 V-phase stator ring (stator body)
53 W-phase stator ring (stator body)
57 U-phase stator piece 58 V-phase stator piece 59 W-phase stator piece P Inclined surface Q Inclined surface

Claims (8)

A method for assembling a motor stator comprising a plurality of stator pieces obtained by dividing an annular stator body in a circumferential direction,
A step of disposing a plurality of stator pieces along the inner surface of the peripheral wall in a casing having a first flange projecting radially inward at one axial end of the cylindrical peripheral wall;
A second flange opposite to the first flange is fastened to the other axial end of the peripheral wall of the casing, and the plurality of stator pieces are compressed in the axial direction by compressing the plurality of stator pieces in the axial direction with the first and second flanges. Urging outwardly and pressing against the inner surface of the peripheral wall;
A method for assembling a stator of a motor, comprising:   All or a part of the plurality of stator pieces has a pair of tapered surfaces that taper in opposite directions in the axial direction, and when the plurality of stator pieces are compressed in the axial direction by the first and second flanges, The method of assembling a stator for a motor according to claim 1, wherein the tapered surfaces of the stator pieces are brought into close contact with each other to generate the radially outward biasing force. A method for assembling a motor stator comprising a plurality of stator pieces obtained by dividing an annular stator body in a circumferential direction,
Arranging a plurality of stator pieces in an annular shape;
A step of fitting a fixing ring having a slit in which a part of the circumferential direction is cut into an outer peripheral surface of a plurality of stator stator pieces arranged in an annular shape;
Tightening the slits of the fixing ring so as to narrow the width, and integrating the plurality of stator pieces;
A method for assembling a stator of a motor, comprising:   All or some of the plurality of stator pieces have a pair of tapered surfaces that taper in opposite directions in the axial direction, and when the plurality of stator pieces are tightened with a fixing ring, the stator stator pieces are aligned in the axial direction. 4. The method of assembling a stator for a motor according to claim 3, wherein the taper surfaces are brought into close contact with each other to generate a radially outward biasing force that presses the outer peripheral surface of each stator piece against the fixing ring. .   5. A biasing force for aligning each stator piece in an axial direction is generated by contact between an inclined surface formed on an outer peripheral surface of the plurality of stator pieces and an inclined surface formed on a fixing ring. A method for assembling the stator of the motor according to claim 1.   The method of assembling a stator for a motor according to any one of claims 1 to 5, wherein all of the plurality of stator pieces have the same shape.   The method for assembling a stator for a motor according to any one of claims 1 to 6, wherein the plurality of stator pieces are made of a dust material. The method of assembling a stator for a motor according to claim 1, wherein at least two stator bodies are laminated in the axial direction inside the casing.

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