JP4625290B2 - Stator for rotating electrical machine - Google Patents

Description

The present invention relates to an improvement in a stator for a rotating electrical machine in which a coil side of a coil formed by forming a rectangular conductor is accommodated in a slot formed between a plurality of teeth provided on the inner periphery of a stator core.

The coil side of a coil made of a conductor wire having a circular cross section is pressed into a square cross section, and the coil side is accommodated in a slot between teeth having flanges extending at both ends in the circumferential direction. A stator for a rotating electrical machine is already known, for example, in Patent Document 1 and the like.
JP 2003-88021 A

  By the way, in what was disclosed by the said patent document 1, the width | variety of the coil side which has a square cross section is set smaller than the space | interval between the collar parts of adjacent teeth, and in inserting a coil side in a slot, One end of the coil end having a circular cross section continuous to both ends of the coil side is bent inward, and the bent side passes between the flanges of the adjacent teeth, and the coil side is accommodated in each slot of the stator core. The winding work around the stator core of the coil is complicated.

The present invention has been made in view of such circumstances, and a rotating electric machine that facilitates the operation of winding a coil formed by forming a rectangular conductor around a stator core so that the coil side is accommodated in a slot. an object of the present invention is to provide a use stator.

In order to achieve the above object, the present invention is for a rotating electrical machine in which the coil side of a coil formed by forming a rectangular conductor is accommodated in a slot formed between a plurality of teeth provided on the inner periphery of a stator core. In the stator, a locking protrusion projecting to one side in the circumferential direction is provided at the tip of each tooth between the adjacent teeth on one side in the circumferential direction to allow the insertion of the coil side into the slot. provided each integrally way open, the the innermost portion at least along a radial direction of the stator core of the coil side, between the neighboring teeth, the pre Symbol coil sides are accommodated in the slot the positioning member of the plate-like or wedge-shaped for defining the outer side along the radial direction retaining projection at a position which can engaged, so as to fulfill the wedging action from the radially inner side of said stator core ON, characterized in that it is fixed.

According to the above configuration of the present invention, there is a coil side slot between the locking protrusion provided integrally at the tip of each tooth provided on the inner periphery of the stator core and the adjacent tooth adjacent in the circumferential direction. Since there is an interval that allows insertion into the stator core, it is easy to insert the coil side of the coil arranged inside the stator core into each slot from the radially inner side of the stator core, With the coil side inserted in each slot , a flat plate or wedge-shaped positioning member is fitted between the innermost coil side along the radial direction of the stator core and the adjacent teeth so as to perform a wedge action, By fixing, the positions of the coil sides are determined so as to engage with the locking protrusions from the radially outer side of the stator core, so that each coil side is prevented from detaching inward from the slot. And that Ri so wound to the stator core of the coil is completed, Ru can be very easily wound coil formed by molding the rectangular conductors in the stator core.

  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 7 show a first embodiment of the present invention. FIG. 1 is a longitudinal side view of an alternator, FIG. 2 is a partially cutaway front view of a stator, and FIG. 4 is a partially cutaway side view seen from the direction, FIG. 4 is a circumferential development view showing the configuration of the coil unit, and FIG. 5 is a view of arrow 5 in FIG. 3 with the single-phase coil unit mounted on the stator core. FIG. 6 is a view seen from the direction of arrow 6 in FIG. 3 with a single-phase coil unit mounted on the stator core, and FIG. 7 is a view taken along line 7-7 in FIG. It is a partial cross section figure of a child.

  First, in FIG. 1, an alternator 25, which is a rotating electrical machine, is mounted on an automobile such as a truck. A Landel rotor 26 and a front bracket 28 on which a shaft 27 of the rotor 26 is rotatably supported. And a rear bracket 29, an excitation core 30 fixedly supported by the rear bracket 29, an excitation coil 31 wound around the excitation core 30 so as to magnetize the rotor 26, and fixed to the rotor 26. The cooling fan 32 and the stator 10 sandwiched between the front and rear brackets 28 and 29 are provided.

  The rotor 26 has a plurality of claw-shaped magnetic poles arranged between a first rotor core 33 having a plurality of claw-shaped magnetic poles 33a at equal intervals in the circumferential direction and a plurality of claw-shaped magnetic poles 33a provided in the first rotor core 33. The second rotor core 34 having 34 a... At equal intervals in the circumferential direction is coupled in a ring shape and fixed to the shaft 27. Cylindrical boss portions 35, 36 are coaxially provided at the center of the front and rear brackets 28, 29, and one end of a shaft 27 is rotatable through a bearing 37 on the boss portion 36 of the rear bracket 29. Supported. The other end of the shaft 27 protrudes outward through the boss portion 35 of the front bracket 28, and a bearing 38 is provided between the boss portion 35 and the shaft 27.

  A cooling fan 32 is fixed to the shaft 27 of the rotor 26 outside the front bracket 28, and a plurality of air circulation holes 39 for circulating cooling air generated by the cooling fan 32 to the front bracket 28. The rear bracket 29 is also provided with a plurality of air circulation holes (not shown) for circulating the cooling air.

  A pulley 40 is fixed to the other end of the shaft 27 outside the cooling fan 32, and an endless belt (not shown) for transmitting power from an engine (not shown) is wound around the pulley 40.

  A cover 42 is attached to the rear bracket 29 so as to form a storage chamber 41 between the rear bracket 29 and the outer surface of the rear bracket 29. In the storage chamber 41, a rectifier 47 comprising a pair of heat sinks 43, 44 fixed to the rear bracket 29 with a space therebetween, and a plurality of diodes 45, 46, attached to the heat sinks 43, 44, and A regulator 48 and the like fixed to the rear bracket 29 are accommodated. The cover 42 is provided with a plurality of air circulation holes 49.

  On the inner surface side of the rear bracket 29, a cylindrical excitation core 30 inserted into the rotor cores 33 and 34 is fixed by a plurality of screw members 50, and the excitation coil 31 is wound around the excitation core 30. .

  Referring to FIGS. 2 and 3 together, the stator 10 is a U-phase, V-phase, and W-phase coil formed on the stator core 11 so as to form a three-phase two-circuit with an electrical angle shifted by 30 degrees. The units 12U ..., 12V ..., 12W ... are mounted in two sets, and the stator core 11 is sandwiched between front and rear brackets 28, 29 that are fastened together by a plurality of through bolts 51 ... The cylindrical yoke portion 11a is integrally formed with a plurality of teeth 11b, 11b... Protruding from the inner periphery of the yoke portion 11a, and a plurality of magnetic steel plates are laminated. Slots 13, 13 ... are formed between the teeth 11b, 11b .... Thus, the number of the teeth 11b, 11b,... Is, for example, 96, 72, 60, 48, 36, or 30, and the same number of slots 13, 13 ... as the teeth 11b, 11b,. It is formed on the inner periphery of the yoke portion 11a.

  In such an alternator 25, an alternating electromotive force is generated in each of the coil units 12U, 12V, and 12W according to the rotation of the shaft 27, and the alternating electromotive force is rectified to direct current by the rectifier 47, and further, the voltage is adjusted by the regulator 48. DC power is output from the alternator 25 as, for example, battery charging power.

  Referring also to FIG. 4, the U-phase coil unit 12U is accommodated in a plurality of sets of slots 13, 13... Selected from among a plurality of slots 13, 13. A plurality of coils 14, 14... Are connected to each other by crossovers 15... When the slots S 13, 13. For example, S1, S7; S13, S19; S25, S31; S37, S43; S49, S55; S13, S67 are accommodated in slots 13, 13,.

  5 and 6 together, the coil 14 includes a pair of coil sides 16 and 16 respectively accommodated in the slots 13 and 13 and a pair of coil ends connecting both ends of the coil sides 16 and 16. 17 and 17 are integrally formed, and a rectangular conductor 18 which is formed in a rectangular cross section and is subjected to insulation treatment on the entire outer surface is wound so that the number of turns is, for example, “3”. Forming a lap winding module.

  Thus, at both coil sides 16, a part of the rectangular conductor 18 is laminated in the depth direction of the slot 13. The coil ends 17 are connected to the coil sides 16 and 16 at one end, and a pair of inclined portions 17a and 17a inclined so as to be separated from the stator core 11 as they come close to each other, and their inclined portions. 17a and 17a, and the torsional connection part 17b which connects between the other ends of 17a. Moreover, the stacking direction of the rectangular conductors 18 at the two inclined portions 17a and 17a is the same as the stacking direction of the coil sides 16 and 16 connected to the inclined portions 17a and 17a. The inclined layers 17a and 17a are twisted approximately 180 degrees so that the stacking directions of the inclined portions 17a and 17a are opposite to each other, and the positions of the inclined portions 17a and 17a are shifted from each other in the radial direction of the stator core 11. The stacking direction of the rectangular conductor 18 is substantially 90 degrees different from the stacking direction of the inclined portions 17a and 17a on both sides, that is, the stacking direction of the coil sides 16 and 16, and substantially along the axial direction of the stator core 11.

  As shown in FIG. 4, such coils 14 are mounted on the stator core 11 so that one coil side 16, 16 of the pair of coils 14, 14 is accommodated in the same slot 13, thereby A U-phase coil unit 12U is configured.

  By the way, the coil unit 12U having the number of turns twice the number of turns of each coil 14 by accommodating one coil side 16, 16 of the pair of coils 14, 14 in the same slot 13 is relatively This is to maintain a relatively small thickness of the collective portion of the coil ends 17 along the radial direction of the stator core 11 even if a large number of turns are obtained. That is, as shown in FIGS. 5 and 6, the torsion coupling portion 17 b at the coil end 17 of the single coil 14 can be arranged so as to be substantially along the radial direction of the stator core 11. Are arranged adjacent to each other in the circumferential direction of the stator core 11 even if the number of turns of the U-phase coil unit 12U is increased by accommodating the coil sides 16 and 16 in the same slot 13. The stator core 11 can be made compact while avoiding interference between the coil ends 17.

  Similarly, the V-phase and W-phase coil units 12V and 12W are configured by mounting a plurality of coils 14 to the stator core 11 in the same manner as the U-phase coil unit 12U, and each of the two sets of coil units 12U. .., 12V..., 12W are mounted on the starter core 11 so that the positions of the slots 13 and 13 accommodating the coil sides 16 and 16 are sequentially shifted in the circumferential direction of the stator core 11 to thereby provide a three-phase two-circuit. Is configured.

  In FIG. 7, at the tips of a plurality of teeth 11b provided on the inner circumference of the stator core 11, locking projections 11c projecting toward one side in the circumferential direction are provided to the slots 13 of the coil sides 16, 16. Are provided integrally with each other so that a gap d that allows insertion of a gap between the adjacent teeth 11b on one side in the circumferential direction is opened.

  Moreover, between the coil sides 16 and 16 accommodated in the slot 13 in a stacked state and the stator core 11, the rectangular conductors 18 constituting the coil sides 16, 16... Directly contact the stator core 11. In order to prevent this, an insulating paper 19 bent in a substantially U shape so as to be in contact with the entire inner surface of the slot 13 is interposed.

Furthermore, according to the present invention, the coil sides 16, 16 are held between the adjacent teeth 11 and at least the innermost portion of the coil sides 16, 16 along the radial direction of the stator core 11. A positioning member 20A for determining a position that can be engaged with 11c from the outer side along the radial direction of the stator core 11 is fitted so as to perform a wedge action from the radially inner side of the stator core 11 . In this first embodiment, a flat plate is formed of an insulating material so as to abut the coil sides 16 and 16 inserted in the slot 13 over the entire length along the depth direction of the slot 13. The positioning member 20A is inserted between the insulating paper 19 and the coil sides 16 and 16 so as to perform a wedge function.

  According to the first embodiment, the stator core 11 is provided between the locking projections 11c provided integrally at the tips of the teeth 11b provided on the inner periphery thereof and the adjacent teeth 11b provided adjacent in the circumferential direction. In addition, since an interval d allowing insertion of the coil sides 16 and 16 into the slot 13 is provided, the coil sides 16 and 16 of the coils 14 disposed inside the stator core 11 are connected to the stator core 11. It is easy to insert into each slot 13 from the radially inner side.

  In addition, with the coil sides 16 and 16 inserted in the respective slots 13..., The positioning members 20A are inserted between the coil sides 16 and 16 and the insulating paper 19 in contact with the adjacent teeth 11b. By inserting and fixing to the coil 13, the positions of the coil sides 16 and 16 are determined so as to engage with the locking protrusion 11 c from the radially outer side of the stator core 11.

  Accordingly, the coil sides 16 and 16 are prevented from detaching inward from the slot 13, thereby completing the winding of the coils 14... On the stator core 11 in each of the coil units 12 U, 12 V, and 12 W. Therefore, the coils 14 formed by forming the rectangular conductor 18 can be wound around the stator core 11 very easily.

As a second embodiment of the present invention, as shown in FIG. 8, the innermost portion along the radial direction of the stator core 11 among the rectangular conductors 18 constituting the coil sides 16, 16 inserted into the slot 13. A positioning member 20B formed in a flat plate shape by an insulating material so as to contact the rectangular conductor 18 may be fitted between the insulating paper 19 and the innermost rectangular conductor 18 so as to perform a wedge action. . Further, as a third embodiment, as shown in FIG. 9, a positioning member 20 </ b> C formed in a wedge shape by an insulating material so as to become narrower toward the inner side of the slot 13 is inserted into the slot 13. The coil sides 16 and 16 may be fitted between the insulating paper 19 and the coil sides 16 and 16 so as to contact the coil sides 16 and 16 over the entire length along the depth direction of the slot 13. Further, as a fourth embodiment, as shown in FIG. 10, a positioning member 20 </ b> D that integrally has a closing plate portion 20 </ b> Da that closes the inner open end of the slot 13 and is formed into a flat plate shape by an insulating material is inserted into the slot 13. The coil sides 16 and 16 may be fitted between the insulating paper 19 and the coil sides 16 and 16 so as to perform a wedge function while abutting the entire length along the depth direction of the slot 13.

FIG. 11 shows a fifth embodiment . Locking protrusions 11c projecting to one side in the circumferential direction are integrally formed at the tips of a plurality of teeth 11b ′ provided on the inner periphery of the stator core 11 ′. And a recess d is provided at the tip of the adjacent tooth 11b 'so as to oppose each locking projection 11c, and an interval d between each locking projection 11c and the recess 11d is The coil sides 16, 16... Are set so as to allow insertion into the slots 13.

  Moreover, of the rectangular conductors 18 constituting the coil sides 16 and 16 inserted in the slot 13, a flat plate shape is formed by an insulating material so as to contact the innermost rectangular conductor 18 along the radial direction of the stator core 11. The positioning member 20 </ b> B is inserted between the portion corresponding to the recess 11 d of the insulating paper 19 and the innermost rectangular conductor 18 so as to perform a wedge function.

This fifth embodiment can also achieve the same effect as the first embodiment.

12 to 16 show a reference example , FIG. 12 is a partial front view of the core block, FIG. 13 is a longitudinal sectional view showing a state in which the core block is laminated in the second step, and FIG. 15 is a perspective view showing a part of the adjacent core block in the state shown in FIG. 15, FIG. 15 is a cross-sectional plan view showing a state in which the coil side is inserted in the third step, and FIG. 16 omits the coil side in the fourth step. It is a perspective view which shows the state which moved the core block relatively in the circumferential direction, however.

In manufacturing the stator, in this reference example , the first to fourth steps are sequentially performed. In the first step, as shown in FIG. 12, the stator core 60 (see FIG. 16) is installed. a plurality of teeth 61 with corresponding to the divided portion in a plurality in the axial direction ... (see FIG. 16) cooperating with a plurality of forming of the teeth corresponding projections 62 ... the inner periphery a plurality of, for example, five with each the core blocks 63 ..., the coil side between the adjacent teeth corresponding protrusions 62 of the teeth corresponding projections 62 ... locking projection 62a projecting toward the one side in the circumferential direction on the tip of, one side in the circumferential direction 16 and 16 (refer to the first embodiment) are prepared in a state of being provided integrally so as to be spaced apart from each other.

  In the second step, as shown in FIGS. 13 and 14, the core blocks 63 are divided into groups of both forward and reverse postures so that the protruding directions of the locking protrusions 62a are opposite to each other. The core blocks 63 in opposite postures are alternately stacked in the axial direction, and the locking protrusions 62a of the teeth-corresponding protrusions 62 of the core block 63 in which the tips of the locking protrusions 62a are adjacent in the axial direction. The circumferential position of each of the core blocks 63 is determined so as to match the side surface on the opposite side.

  In the next third step, as shown in FIG. 15, the coil sides 16, 16 of the coil 14 are placed between the teeth-corresponding protrusions 62 of the stacked core blocks 63. Insert from the inside in the radial direction. At this time, when the surface of the rectangular conductor 18 is not insulated, an insulating member such as an insulating paper 19 is interposed between the core blocks 63 and the coil sides 16 and 16.

  In the fourth step, as shown in FIG. 16, the core blocks 63, 63... Are arranged in the circumferential direction so that the side surfaces of the teeth corresponding projections 62. After being moved relative to each other, for example, the outer periphery is joined by welding. Thereby, each of the core blocks 63,... Has a plurality of teeth 61 formed by the teeth corresponding protrusions 62 so that the locking protrusions 62a. The core 61 is configured, and the stators are manufactured by accommodating the coil sides 16 in slots 64 formed between the teeth 61.

According to this reference example , the coil blocks 16 and 16 of the coil 14 are arranged in the radial direction between the teeth-corresponding protrusions 62 provided on the inner circumference of the core blocks 63 in both forward and reverse postures that are alternately stacked in the axial direction. It is possible to insert the core blocks 63, 63 ... in the fourth step after the completion of the third step in which the coil sides 16, 16 are inserted between the teeth corresponding protrusions 62 .... A plurality of teeth 61... Are formed on the inner periphery of the stator core 60, in which the locking protrusions 62 a alternately protrude in the opposite direction for each core block 63 by being coupled after the relative movement in the circumferential direction. The coil sides 16 and 16 accommodated in the slots 64 formed between the teeth 61 are engaged with the locking projections 62a from the radially outer side of the stator core 60 for each core block 63. It will be.

  Accordingly, the coil sides 16 and 16 can be accommodated in the slots 64 so as to be prevented from detaching from the slots 64, and the coil 14 formed by forming the rectangular conductor 18 can be wound around the stator core 60 very easily. can do.

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

It is a vertical side view of the alternator of 1st Example. It is a partially cutaway front view of a stator. FIG. 3 is a partially cutaway side view seen from the direction of arrow 3 in FIG. 2. It is the circumferential direction expanded view which shows the structure of a coil unit. It is the figure seen from the 5 arrow direction of FIG. 3 in the state which mounted | wore the stator core with the single phase coil unit. It is the figure seen from the 6 arrow direction of FIG. 3 in the state which mounted | wore the stator core with the single phase coil unit. FIG. 7 is a partial cross-sectional view of the stator taken along line 7-7 in FIG. 3. It is sectional drawing corresponding to FIG. 7 of 2nd Example . It is sectional drawing corresponding to FIG. 7 of 3rd Example . It is sectional drawing corresponding to FIG. 7 of 4th Example . It is sectional drawing corresponding to FIG. 7 of 5th Example . It is a partial front view of the core block of a reference example . It is a longitudinal cross-sectional view which shows the state which laminated | stacked the core block at the 2nd process. It is a perspective view which shows a part of adjacent core block in the state shown in FIG. It is a cross-sectional top view which shows the state which inserted the coil side at the 3rd process. It is a perspective view which shows the state which moved the core block relatively to the circumferential direction, abbreviate | omitting a coil side at a 4th process.

10 ... stator 11, 11 ', ... stator core 11b, 11b', ... teeth 11 c-... locking projection 1 3 · · · slot 14 ... coil 16 ... coil sides 18 ... square conductors 20A to 20D ... positioning member

Claims (1)

The coil (14) is formed by forming a rectangular conductor (18) in a slot (13) formed between a plurality of teeth (11b, 11b ') provided on the inner periphery of the stator core (11, 11'). In the stator for a rotating electrical machine in which the coil side (16) is accommodated, a locking protrusion (11c) protruding to one side in the circumferential direction is provided at the tip of each of the teeth (11b, 11b ′). 16) is provided integrally with the adjacent teeth (11b, 11b ′) on one side in the circumferential direction so as to allow the insertion into the slot (13) and accommodated in the slot (13). at least the innermost portion along the radial direction of the stator core (11) of the coil sides (16) that is, between the adjacent teeth (11b, 11b '), before Symbol coil sides (16) The locking projection (11c The radially along outer flat or wedge-shaped for defining a position that may engage the side of the positioning member (20A to 20D) it is, from a radially inner side of said stator core (11, 11 ') to fitted so as to perform a wedge action, the rotary electric machine stator characterized in that it is fixed.

Images