JP7423930B2 - Slotless rotating electrical machine and method for manufacturing slotless rotating electrical machine - Google Patents

Description

The present invention relates to a slotless rotating electrical machine and a method for manufacturing the slotless rotating electrical machine.

Conventionally, a slotless rotating electrical machine has, for example, a coil having an axial coil section extending in the axial direction and a coil end section connecting a pair of axial coil sections in the circumferential direction, and connecting at the coil end section. There is one in which the teeth are not arranged between the axial coil parts that are arranged in the circumferential direction, and axial coil parts of other phases are arranged (for example, see Patent Document 1). In this slotless rotating electrical machine, the coil end portion is bent in the radial direction from the axial end of the axial coil portion and is arranged so as to overlap the coil end portions of the other phases in the axial direction.

Special Publication No. 7-50975

However, in the above-mentioned slotless rotating electric machine, the coil end portions of different phases are arranged so as to overlap, so there is a risk that the coils of different phases may short-circuit, which may cause a large potential difference at the coil end portions. There is.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a slotless rotating electrical machine that can ensure insulation between coils of different phases, and a method for manufacturing the slotless rotating electrical machine. Our goal is to provide the following.

A slotless rotating electric machine (11) that solves the above problem has an axial coil section (21, 21u, 21v, 21w, 83, 83a, 83b) extending in the axial direction, and a pair of axial coil sections that extend in the circumferential direction. A coil (16, 16u, 16v, 16w, 81, 81a, 81b) having a coil end portion (22, 22u, 22v, 22w, 84, 84a, 84b) connected to the In the slotless rotating electric machine (11), the axial coil portions of other phases are arranged between the axial coil portions that are separated in the circumferential direction, and the coil end portions of different phases are arranged so as to overlap. Insulating members (32, 74v, 74w, 85) are interposed between the coil end portions of different phases.

According to this configuration, since the insulating member is interposed between the coil end portions of different phases, it is possible to ensure insulation between the coils of different phases, which may have a large potential difference.
A method for manufacturing a slotless rotating electrical machine (11) that solves the above problem includes an axial coil portion (21, 21u, 21v, 21w) extending in the axial direction, and a coil portion bent in the radial direction from the end of the axial coil portion. A coil (16, 16u, 16v, 16w) having a coil end portion (22, 22u, 22v, 22w) that connects the pair of axial coil portions in the circumferential direction; The axial coil portions of the other phases are disposed between the axial coil portions connected at the coil end portions in the circumferential direction, and the axial coil portions of the different phases A method for manufacturing a slotless rotating electric machine (11) in which the coil end portions are arranged so as to overlap in the axial direction, the method comprising: placing one coil end portion in the axial direction of the fixing member; , after the mounting step, an insulating member arranging step of arranging an insulating member (32, 74v, 74w) in the axial direction of the coil end portion mounted on the fixing member, and after the insulating member arranging step, and a sandwiching step of arranging the coil end portions of different phases so as to sandwich the insulating member between the coil end portions placed in the placement step.

According to this method, since an insulating member is interposed between the coil end portions of different phases, insulation between the coils of different phases can be ensured. By assembling each member to the fixed member in the order in which they are stacked in the axial direction, the insulating member can be satisfactorily interposed between the coil end portions of different phases.

A method for manufacturing a slotless rotating electrical machine (11) that solves the above problem includes an axial coil portion (21, 21u, 21v, 21w) extending in the axial direction, and a coil portion bent in the radial direction from the end of the axial coil portion. A coil (16, 16u, 16v, 16w) having a coil end portion (22, 22u, 22v, 22w) that connects the pair of axial coil portions in the circumferential direction; The axial coil portions of the other phases are disposed between the axial coil portions connected at the coil end portions in the circumferential direction, and the axial coil portions of the different phases A method for manufacturing a slotless rotating electric machine (11) in which the coil end portions are arranged so as to overlap in the axial direction, the method comprising: placing one coil end portion in the axial direction of the fixing member; , after the placing step, a stacking step of arranging the coil end portions of different phases in the axial direction of the coil end portion placed on the fixing member; The method includes an insertion step of inserting an insulating member (32, 74v, 74w) between the coil end portions.

According to this method, since an insulating member is interposed between the coil end portions of different phases, insulation between the coils of different phases can be ensured. Since the insulating member is inserted after the coil end portions of different phases are stacked on the fixed member, the coil end The process of assembling the parts can be performed continuously, and the manufacturing process can be simplified.

FIG. 1 is a partial cross-sectional view of a slotless rotating electric machine in one embodiment. FIG. 2 is a plan view of a stator in one embodiment. FIG. 2 is a perspective view of a stator in one embodiment. FIG. 2 is an exploded perspective view of a stator in one embodiment. FIG. 3 is a perspective view of a first intermediate member in the process of manufacturing a coil in one embodiment. FIG. 7 is a perspective view of a second intermediate member in the process of manufacturing a coil in one embodiment. FIG. 2 is a partially enlarged sectional view of a stator in one embodiment. FIG. 2 is a partially enlarged perspective view of a stator in one embodiment. (a) to (c) are schematic diagrams for explaining a coil end portion, one end, and the other end of a stator in one embodiment. The top view of the stator in another example. The top view of the stator in another example. FIG. 7 is a partially enlarged sectional view of a stator in another example. The partial sectional view of the slotless rotating electric machine in another example. FIG. 7 is a plan view of a stator in another example. The partial sectional view of the slotless rotating electric machine in another example. The partial perspective view of the stator in another example. The partial perspective view of the stator in another example.

An embodiment of a slotless rotating electrical machine will be described below with reference to FIGS. 1 to 9.
As shown in FIG. 1, the slotless rotating electric machine 11 includes a center piece 12, a stator 13 fixed to the center piece 12, and a rotor 14 rotatably supported with respect to the center piece 12.

The centerpiece 12 has a substantially cylindrical cylindrical portion 12a and a flange portion 12b extending radially outward from one axial end of the cylindrical portion 12a.
The stator 13 includes a stator core 15 as a substantially disk-shaped fixing member made of laminated magnetic plates, and a coil 16 fixed to the stator core 15. The stator 13 is fixed with the center hole 15a of the stator core 15 being fitted onto the cylindrical portion 12a of the center piece 12.

The rotor 14 includes a rotating shaft 17, a bell-shaped rotor yoke 18 fixed to the rotating shaft 17 and provided so as to cover the stator 13, and a permanent magnet 19 fixed to the inner peripheral surface of the rotor yoke 18. The rotor 14 is rotatably supported by a pair of bearings 20 with a rotating shaft 17 inserted through the cylindrical portion 12a of the center piece 12.

As shown in FIGS. 2 to 4, the stator 13 of this embodiment has no teeth and slots between the teeth for winding the coil 16 around the stator core 15, and the coil 16 is not provided on the outer circumference side of the stator core 15. It is said to be a slotless type that is fixed.

The coil 16 includes an axial coil portion 21 that extends in the axial direction along the outer peripheral surface of the stator core 15 and a coil end portion 22 that connects the pair of axial coil portions 21 in the circumferential direction. Axial coil portions 21 of other phases are arranged between the axial coil portions 21 connected together in the circumferential direction.

Specifically, as shown in FIGS. 5 and 6, the coil 16 passes through first and second intermediate members 24 and 25, which are manufactured by bending a wire 23 that is a conductor coated with enamel. Molded into the shape shown. That is, first, as shown in FIG. 5, the wire 23 is wound annularly for a plurality of turns, and in this embodiment, is wound annularly for four turns to form the first intermediate member 24. Then, as shown in FIGS. 5 and 6, the first intermediate member 24 is bent to form a second intermediate member 25 so that unevenness is formed in the axial direction at five locations in the circumferential direction. Then, as shown in FIGS. 6 to 4, both ends of the second intermediate member 25 in the axial direction are bent inward in the radial direction, and the bent portion becomes the coil end portion 22. The coil 16 is formed by forming an axial coil portion 21 in which the coil 16 extends. Note that one axial coil portion 21 is configured such that four wire rods 23 are arranged adjacent to each other in the circumferential direction.

As shown in FIGS. 2 and 3, the coil 16 formed as described above is bent so that the axial coil portion 21 is along the outer peripheral surface of the stator core 15 and the coil end portion 22 is aligned with the stator core 15. are arranged so as to overlap on the end faces in the axial direction.

The coil 16 of this embodiment includes a U-phase coil 16u, a V-phase coil 16v, and a W-phase coil 16w, which are assembled to the stator core 15 in this order. One axial coil part 21v, 21w of each of the V-phase and W-phase is disposed between the axial coil parts 21u connected at the coil end part 22u of the U-phase coil 16u in the circumferential direction. There is. Moreover, one axial coil part 21u, 21w of each of the U phase and W phase is arranged between the axial coil parts 21v connected at the coil end part 22v of the V phase coil 16v in the circumferential direction. There is. Moreover, one axial coil part 21u, 21v of each of the U phase and V phase is arranged between the axial coil parts 21w connected at the coil end part 22w of the W phase coil 16w in the circumferential direction. There is. The U-phase coil end portion 22u is placed in the axial direction of the stator core 15, and the V-phase coil end portion 22v and W-phase coil end portion 22w are placed on the U-phase coil end portion 22u in this order. They are arranged so as to overlap in the axial direction. That is, in the coil end portion 22, the U-phase coil end portion 22u is the lower layer, the V-phase coil end portion 22v is the middle layer, and the W-phase coil end portion 22w is the upper layer. They are arranged so as to overlap in the axial direction. In addition, in FIG. 1, in order to make it easier to visually understand the positional relationship between the coil end parts 22u, 22v, and 22w in the upper, middle, and lower layers, the cross sections of the coil end parts 22u, 22v, and 22w are not shown accurately, but are shown schematically. It is illustrated. In addition, the U-phase, V-phase, and W-phase coils 16u, 16v, and 16w have different axial positions of the coil end portions 22u, 22v, and 22w, so that the axial coil portions 21u, 21v, and 21w have different axial positions. The length and the radial length of the coil end portions 22u, 22v, and 22w are formed to be different from each other.

Further, as shown in FIG. 7, a protrusion 31 is provided on the outer circumferential surface of the stator core 15 so as to protrude in the radial direction with a protrusion amount equal to or less than the diameter of the wire rod 23 and engage with the wire rod 23 in the circumferential direction. Specifically, the protrusion 31 of this embodiment protrudes radially outward by a protrusion amount that is equal to or less than the radius of the wire rod 23 and smaller than the radius. Further, the protrusions 31 are provided between all the wire rods 23. That is, the number of protrusions 31 is the same as the number of wire rods 23 arranged in the circumferential direction, and 120 protrusions are formed in the circumferential direction. Further, the protrusion 31 has a curved surface 31a along the circumferential surface of the wire 23, and the wire 23 is arranged so as to be in surface contact with the curved surface 31a. Further, the dimensions of the curved surface 31a and the like of the protrusion 31 are set so that the wire rods 23 are arranged side by side in the circumferential direction without gaps.

Further, as shown in FIGS. 1 and 8, an insulating member 32 is interposed between the coil end portions 22u, 22v, and 22w of different phases. Note that illustration of the insulating member 32 is omitted in FIGS. 2 to 4 and the like. The insulating member 32 is formed by molding an insulating material into a sheet shape. Further, a plurality of portions are provided in the circumferential direction where the coil end portions 22u, 22v, and 22w of different phases overlap, and the insulating member 32 of this embodiment has coil end portions 22u of different phases, It is formed in an annular shape to be interposed between 22v and 22w. That is, the U-phase coil end portion 22u and the V-phase coil end portion 22v overlap in the axial direction at five locations in the circumferential direction on one side in the axial direction, but these five locations are connected to one annular sheet. It is insulated by an insulating member 32. In addition, the V-phase coil end portion 22v and the W-phase coil end portion 22w overlap in the axial direction at five locations in the circumferential direction on one side in the axial direction. It is insulated by an insulating member 32.

Further, an inter-fixing member insulating member 33 is interposed between the U-phase coil end portion 22u and the stator core 15. The inter-fixing member insulating member 33 is formed in an annular shape similarly to the insulating member 32 described above.

Further, the insulating member 32 and the inter-fixing member insulating member 33 of this embodiment are fixed to the coil end portions 22u, 22v, and 22w. Specifically, in this embodiment, when the coil 16, the insulating member 32, and the inter-fixing member insulating member 33 are assembled to the stator core 15, their surfaces and the parts where they come into contact are molded with a molding material 34. This makes each of them fixed to each other. Note that the molding material 34 is only thinly provided on the surfaces and gaps of each member, and in FIG. 1, the reference numeral 34 is attached to the surface of the coil end portion 22w.

The stator 13 described above is assembled to the stator core 15 in the order in which each member is stacked in the axial direction. That is, the manufacturing method in this embodiment includes a step of first mounting the inter-fixing member insulating member 33 in the axial direction of the stator core 15, and then assembling the U-phase coil 16u and attaching the coil end portion 22u to the inter-fixing member insulating member 33. The stator core 15 is placed in the axial direction of the stator core 15 on which the stator core 15 is placed. Further, the manufacturing method includes an insulating member arranging step of arranging the insulating member 32 in the axial direction of the U-phase coil end portion 22u after the mounting step, and an insulating member arranging step of assembling the V-phase coil 16v after the insulating member arranging step. , and a sandwiching step of arranging the V-phase coil end portion 22v so that the insulating member 32 is sandwiched between the U-phase coil end portion 22u placed in the above-described placement step. Further, in this embodiment, after that, the insulating member 32 is arranged in the axial direction of the V-phase coil end portion 22v, and after the insulating member arranging step, the W-phase coil 16w is assembled, and the V-phase coil 16w is assembled. and a sandwiching step of arranging the W-phase coil end portion 22w so that the insulating member 32 is sandwiched between the coil end portion 22u and the coil end portion 22u.

Further, as shown in FIGS. 2 and 3, one end 41 of the coil 16 is provided to extend inward in the radial direction while axially overlapping the coil end portion 22 of its own phase, and the other end 42 of the coil 16 is It is provided so as to extend inward in the radial direction without overlapping in the axial direction with the coil end portion 22 of its own phase. That is, in the coil 16 formed as described above, when both ends are pulled out radially inward, it is impossible to provide one end and the other end so that they do not overlap in the axial direction with the coil end portion 22 of its own phase. First, one end 41 overlaps the coil end portion 22 of its own phase in the axial direction.

As shown in FIG. 2, FIG. 3, and FIG. 9(c), one end 41u of the U-phase coil 16u in the lower layer is connected to a circumference where the V-phase coil end portion 22v in the middle layer does not exist above. It is arranged above the coil end portion 22u of its own phase on the direction side (left side in FIG. 9(c)) and in the middle layer.

Furthermore, as shown in FIGS. 2, 3, and 9(b), one end 41v of the V-phase coil 16v in the middle layer has a circumference where the W-phase coil end portion 22w in the upper layer does not exist above. It is arranged above the coil end portion 22v of its own phase on the direction side (right side in FIG. 9(b)) and in the upper layer.

In addition, as shown in FIGS. 2, 3, and 9(a), one end 41w of the W-phase coil 16w in the upper layer is connected to a circumference where the V-phase coil end portion 22v in the middle layer does not exist below. It is disposed in the middle layer below the coil end portion 22w of its own phase on the direction side (left side in FIG. 9(a)).

Note that the other ends 42u, 42v, 42w of the coils 16u, 16v, 16w of each phase are provided so as to extend radially inward without overlapping with the coil end portions 22u, 22v, 22w of the own phase in the axial direction. ing. Moreover, the arrangement configuration of the above-described one ends 41u, 41v, 41w and the other ends 42u, 42v, 42w is made into a shape corresponding to each from the stage of molding the above-described first and second intermediate members 24, 25, 5 and 6 illustrate the first and second intermediate members 24 and 25 corresponding to the U-phase coil 16u.

As shown in FIG. 2, one end 41 and the other end 42 of the coil 16 are connected to a neutral terminal 43 or a power terminal 44 as a terminal.
Specifically, in this embodiment, one end 41u, 41v, 41w of the coils 16u, 16v, 16w of each phase is used as a neutral point connection part, and is connected to the neutral point terminal 43. This neutral point terminal 43 is arranged within the range of the upper, middle, and lower layers of the coil end portions 22u, 22v, and 22w in the axial direction.

Further, the other ends 42u, 42v, 42w of the coils 16u, 16v, 16w of each phase are used as power supply connection parts, and are connected to power supply terminals 44 corresponding to the respective phases. A part of this power supply terminal 44 is arranged within the axial range of the upper, middle and lower layers of the coil end parts 22u, 22v, 22w, and within that range, the power supply terminal 44 is connected to the other end 42u, 42v. , 42w.

As shown in FIG. 1, each power terminal 44 passes through the flange portion 12b of the center piece 12 and is connected to a circuit board 45 capable of supplying three-phase drive currents with a phase shift of 120 degrees. .

Next, the operation of the slotless rotating electric machine 11 configured as described above will be explained.
When a three-phase drive current is supplied from the circuit board 45 to the coil 16 of the stator 13, a rotating magnetic field is generated in the stator 13, and the rotor 14 is rotationally driven.

Next, the effects of the above embodiment will be described below.
(1) Since the insulating member 32 is interposed between the coil end portions 22u, 22v, and 22w of different phases, the insulation between the coils 16u, 16v, and 16w of different phases, which may have a large potential difference, is improved. can be secured.

(2) The coil end portions 22u, 22v, and 22w are bent in the radial direction from the ends of the axial coil portions 21u, 21v, and 21w and are arranged so as to overlap in the axial direction. It is possible to reduce the size in the axial direction compared to a structure in which the structure is arranged so as to extend in the axial direction.

(3) Since the interfixing member insulating member 33 is interposed between the U-phase coil end portion 22u and the stator core 15 in the axial direction, insulation between the coil end portion 22u and the stator core 15 is ensured. be able to.

(4) Since the insulating member 32 is formed in an annular shape to be interposed between the coil end portions 22u, 22v, and 22w of different phases at all positions in the circumferential direction, for example, a plurality of insulating members in the circumferential direction The number of parts can be reduced compared to the case where

(5) Since the insulating member 32 is fixed to the coil end portions 22u, 22v, and 22w, for example, compared to a structure in which the insulating member 32 is simply sandwiched between the coil end portions 22u, 22v, and 22w of different phases, , it is possible to continue to maintain insulation.

(6) In the above manufacturing method, by assembling each member to the stator core 15 in the order in which they are stacked in the axial direction, the insulating member 32 can be satisfactorily interposed between the coil end portions 22u, 22v, and 22w of different phases. be able to. That is, the insulating member 32 can be easily and reliably interposed between the coil end portions 22u, 22v, and 22w compared to the case where the insulating member 32 is inserted after the coil end portions 22u, 22v, and 22w are arranged one on top of the other. Can be done.

(7) One ends 41u, 41v, 41w of the coils 16u, 16v, 16w that overlap in the axial direction with the coil end portions 22u, 22v, 22w of their own phase are all located in the upper, middle and lower layers of the coil end portions 22u, 22v, 22w. Since it is arranged within the range of the axial direction, it is possible to achieve miniaturization in the axial direction compared to a structure arranged within the range of four or more layers.

(8) The neutral point terminal 43 to which one end 41 of the coil 16 is connected is disposed within the axial range of the upper, middle, and lower layers of the coil end portions 22u, 22v, and 22w. One end 41 of the coil 16 can be connected to the neutral point terminal 43 within the axial range of the upper, middle and lower layers of 22v and 22w. Therefore, compared to a case where the neutral point terminal 43 is arranged outside the axial range of the upper, middle, and lower layers of the coil end portions 22u, 22v, and 22w, the size can be reduced in the axial direction. Further, a part of the power terminal 44 to which the other end 42 of the coil 16 is connected is disposed within the axial range of the upper, middle, and lower layers of the coil end portions 22u, 22v, and 22w. , 22v, 22w, the other end 42 of the coil 16 can be connected to the power terminal 44 within the axial range of the upper, middle, and lower layers. Therefore, compared to a case where the power terminal 44 is arranged outside the axial range of the upper, middle, and lower layers of the coil end portions 22u, 22v, and 22w, the size can be reduced in the axial direction.

(9) The outer peripheral surface of the stator core 15 is provided with a protrusion 31 that protrudes in the radial direction and engages the wire 23 in the circumferential direction with a protrusion amount that is less than or equal to the diameter of the wire 23 constituting the coil 16. 21 is prevented from moving in the circumferential direction. Therefore, an increase in torque ripple can be suppressed.

(10) Since the projections 31 are provided between the wire rods 23 of different phases, in other words, between the axial coil parts 21u, 21v, 21w of different phases, there is no possibility that the wire rods 23 of different phases will rub against each other. Application of a large force can be suppressed, and insulation between the wires 23 of different phases, which may have a large potential difference, can be ensured.

(11) Since the projections 31 are provided between all the wire rods 23, movement of all the wire rods 23 in the circumferential direction is suppressed.
(12) Since the protrusions 31 protrude outward in the radial direction with a protrusion amount that is equal to or less than the radius of the wire rod 23 and smaller than the radius, it is possible to arrange the wire rods 23 side by side in the circumferential direction without gaps as in this embodiment. , higher efficiency can be achieved than in the case where the wire rods 23 are spaced apart in the circumferential direction.

(13) Since the protrusion 31 has the curved surface 31a along the circumferential surface of the wire 23, the wire 23 can be brought into surface contact with the protrusion 31 and engaged in the circumferential direction. Therefore, for example, application of local force to the wire 23 can be suppressed, and damage to the wire 23 can be suppressed.

The above embodiment can be modified and implemented as follows. Further, this embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
- In the above embodiment, as shown in FIG. 2, the one end 41 and the other end 42 of the coil 16 are arranged at different positions in the circumferential direction for each phase, but the present invention is not limited to this. The circumferential position of the end 42 may be changed to other arrangements.

For example, as shown in FIG. 10, three neutral point connection parts consisting of one end 51v, 51w and the other end 52u of the coils 16u, 16v, 16w of each phase are connected to the three pairs of axial coil parts arranged in the circumferential direction. They may be arranged within the circumferential range of 21u, 21v, and 21w, that is, within the circumferential range where 24 wire rods 23 are lined up. In this way, for example, the circumferential spacing between the neutral point connecting portions can be made smaller than when the three neutral point connecting portions are arranged outside the range in the circumferential direction. Therefore, for example, the circumferential length of the neutral point terminal 43 can be shortened.

For example, as shown in FIG. 10, three power supply connection parts consisting of one end 51u and the other end 52v, 52w of the coils 16u, 16v, 16w of each phase are connected to the three pairs of axial coil parts arranged in the circumferential direction. They may be arranged within the circumferential range of 21u, 21v, and 21w, that is, within the circumferential range where 24 wire rods 23 are lined up. In this way, the circumferential interval between the power supply connection parts can be made smaller, for example, compared to the case where the three power supply connection parts are arranged outside the range in the circumferential direction. Therefore, for example, three power terminals 44 can be provided in a narrow range in the circumferential direction.

For example, as shown in FIG. 11, there are three neutral point connections consisting of one end 61w and the other end 62u, 62v of the coils 16u, 16v, 16w of each phase, and the coils 16u, 16v, 16w of each phase. The three power connection parts consisting of one end 61u, 61v and the other end 62w are connected to the circumferential range of the three pairs of axial coil parts 21u, 21v, 21w arranged in the circumferential direction, that is, the circumferential range in which 24 wire rods 23 are arranged. It may be placed within the range. In this way, it is possible to obtain the effect of the above-mentioned other example (see FIG. 11), and also to provide three neutral point connection parts and three power supply connection parts in a narrow range in the circumferential direction. .

- In the above embodiment, the protrusions 31 of the stator core 15 are provided between all the wire rods 23, but the protrusions 31 are not limited to this, and may be provided at other intervals.
For example, as shown in FIG. 12, the protrusions 31 may be provided only between the wire rods 23 of different phases, in other words, only between the axial coil parts 21u, 21v, and 21w of different phases.

- Although not specifically mentioned in the above embodiment, the coil 16 and the stator core 15 may be further insulated.
For example, as shown in FIG. 13, an insulating member 72 between the bent portions may be interposed between the stator core 15 and the bent portion 71 between the axial coil portion 21u and the coil end portion 22u. In this way, the insulation between the bent portion 71 and the stator core 15 can be ensured.

Further, for example, as shown in FIG. 13, a radial insulation member 73 may be interposed between the axial coil portion 21 and the stator core 15. In this way, insulation between the axial coil portion 21 and the stator core 15 can be ensured.

- In the above embodiment, the insulating member 32 is formed in an annular shape, but the insulating member 32 is not limited to this, and may be interposed between the coil end portions 22u, 22v, and 22w of different phases in a plurality of ranges in the circumferential direction. If possible, a plurality of them may be provided in the circumferential direction.

For example, as shown in FIG. 14, below the W-phase coil end portion 22w and on the stator core 15 side, there is a fan-shaped fan shape with a circumferential width slightly wider than the circumferential width of the W-phase coil end portion 22w. An insulating member 74w may also be provided. Further, below the V-phase coil end portion 22v and on the stator core 15 side, a fan-shaped insulating member 74v is arranged with a circumferential width slightly wider than the circumferential width of the V-phase coil end portion 22v. Good too. In this way, for example, compared to the case where the annular insulating member 32 is used, it is possible to reduce the number of unnecessary insulating members in the circumferential direction, and it is possible to suppress the waste of the material of the insulating member.

- In the above embodiment, the coil end portions 22u, 22v, 22w are bent radially inward from the end of the axial coil portion 21, but are not limited to this, and may be bent in other directions. Good too.

For example, as shown in FIG. 15, the coil end portions 22u, 22v, 22w on one side in the axial direction in the above embodiment may be bent radially outward. In this way, for example, the inter-fixing member insulating member 33 between the coil end portion 22u bent radially outward and the stator core 15 in the axial direction becomes unnecessary. Further, in this case, the molded coil 16 can be assembled to the stator core 15 without being bent, and the assembly becomes easy. Further, for example, the present invention may be embodied in an inner rotor type slotless rotating electrical machine in which both axial coil end portions are bent radially outward.

Further, for example, changes may be made as shown in FIGS. 16 and 17. The coil 81 of this example differs from the wave-wound type coil 16 using the wire rod 23 of the above embodiment, in that the coil end portion uses a flat wire 82 and connects a pair of axial coil portions 83 in the circumferential direction. 84 connects the same axial coil portions 83 on one side and the other side in the axial direction. The axial coil portion 83b of the B-phase coil 81b is disposed between the pair of axial coil portions 83a of the A-phase coil 81a in the circumferential direction. The B-phase coil end portion 84b is bent slightly outward in the radial direction, further bent in the axial direction, and arranged so as to overlap the A-phase coil end portion 84a in the radial direction. An insulating member 85 is interposed between the coil end portions 84a and 84b of different phases configured in this way. The insulating member 85 is formed in an annular shape so as to be interposed between the coil end portions 84a and 84b of different phases at all positions in the circumferential direction. Note that FIG. 16 shows a type in which the stator core 86 is disposed outside the axial coil portion 83 in the radial direction, and FIG. 17 shows a type in which the stator core is not disposed outside the axial coil portion 83 in the radial direction. Further, the coil 81 shown in FIG. 17 is of a type in which coil end portions 84a and 84b are arranged so as to overlap only on one side in the axial direction.

Even in this case, insulation between the coils 81a and 81b of different phases, which may have a large potential difference, can be ensured.
- In the above embodiment, one end 41v of the V-phase coil 16v in the middle layer is arranged in the upper layer as shown in FIG. 9(b), but the present invention is not limited to this. The U-phase coil end portion 22u may be located below the coil end portion 22v of its own phase on the circumferential side (on the right side in FIG. 9(b)) where the U-phase coil end portion 22u does not exist below.

- In the above embodiment, the configuration includes the neutral point terminal 43 and the power terminal 44 as terminals to which the one end 41 and the other end 42 of the coil 16 are connected, but these terminals are not provided and the wiring is connected in another configuration. It is also possible to do so.

- In the above embodiment, the inter-fixing member insulating member 33 is interposed between the U-phase coil end portion 22u and the stator core 15 in the axial direction, but the inter-fixing member insulating member 33 is not limited to this. 33 may be omitted. Furthermore, the inter-fixing member insulating member 33 is not limited to being placed on the stator core 15, but may be an insulating coating material that is coated on the stator core 15.

- In the above embodiment, the insulating member 32 is fixed to the coil end portions 22u, 22v, 22w by being molded with the molding material 34, but the insulating member 32 is not limited to this, for example, it may be bonded to each other. They may be fixed with a single adhesive, or may be simply sandwiched between coil end portions 22u, 22v, and 22w of different phases.

- In the above manufacturing method, each member such as the coil end portions 22u, 22v, 22w and the insulating member 32 are assembled to the stator core 15 in the order in which they are stacked in the axial direction. However, the present invention is not limited to this, and the coil end portion 22u , 22v, and 22w may be arranged before the insulating member 32 is assembled.

That is, a placing step of placing one coil end portion 22u in the axial direction of the stator core 15, and then an overlapping arrangement step of placing coil end portions 22v, 22w of different phases in the axial direction of the coil end portion 22u. Thereafter, the manufacturing method may include an insertion step of inserting the insulating member 32 between the coil end portions 22u, 22v, and 22w of different phases. By doing this, for example, compared to the case where each member is assembled to the stator core 15 in the order in which each member is stacked in the axial direction, the process of assembling the coil end parts 22u, 22v, and 22w can be performed continuously, and the manufacturing process can be simplified. It can be simplified. In addition, when manufacturing in this way, it is preferable that the insulating member 32 is made into several insulating members in the circumferential direction like the insulating members 74v and 74w of the said another example (refer FIG. 14).

- In the above embodiment, the outer circumferential surface of the stator core 15 is provided with the protrusion 31 that engages with the wire rod 23 in the circumferential direction, but the present invention is not limited to this, and a configuration may be adopted in which the protrusion 31 is not provided. .

- In the above embodiment, the protrusion 31 is provided between the wire rods 23 of different phases, in other words, between the axial coil parts 21u, 21v, 21w of different phases, but the protrusion 31 is not limited to this, and is provided between the wire rods 23 of different phases. It may be provided at a position other than between the phase wire rods 23.

- In the above embodiment, the protrusion 31 protrudes outward in the radial direction with a protrusion amount that is equal to or less than the radius of the wire rod 23 and smaller than the radius. It may be made to protrude outward in the direction.

- In the above embodiment, the protrusion 31 has the curved surface 31a along the circumferential surface of the wire 23, but is not limited to this, and may have a shape that does not have the curved surface 31a.
- In the above embodiment, the one ends 41u, 41v, 41w of the coils 16u, 16v, 16w that overlap in the axial direction with the coil end portions 22u, 22v, 22w of their own phase are all located in the upper center of the coil end portions 22u, 22v, 22w. Although it has been described that it is arranged within the range of the lower layer in the axial direction, it is not limited thereto, and may be arranged in the range of four or more layers.

- In the above embodiment, the protrusion 31 is integrally molded with the stator core 15, but the protrusion 31 is not limited to this, and may be formed as a separate member from the stator core. For example, the protrusion 31 may be fixed to the outer circumferential surface of the stator core 15. A protrusion may be formed on the insulating member.

- In the above embodiment, the wire 23 is simply a single conductor coated with enamel, but the wire rod 23 is not limited to this, and may be, for example, a bundled wire having a configuration in which thin conductors are bundled.

11... Slotless rotating electric machine, 15... Stator core (fixed member), 16, 16u, 16v, 16w, 81, 81a, 81b... Coil, 21, 21u, 21v, 21w, 83, 83a, 83b... Axial coil part, 22, 22u, 22v, 22w, 84, 84a, 84b... Coil end portion, 32, 74v, 74w, 85... Insulating member, 33... Insulating member between fixed members, 71... Bent part, 72... Insulating member between bending parts.

Claims (7)

A fixing member (15), an axial coil portion (21, 21u, 21v, 21w, 83, 83a, 83b) extending in the axial direction along the outer peripheral surface of the fixing member, and arranged on an axial end surface of the fixing member. A coil ( 16 , 16u, 16v, 16w, 81, 81a) having a coil end portion (22, 22u, 22v, 22w, 84, 84a, 84b) that connects the pair of axial coil portions in the circumferential direction. , 81b) , the axial coil part of another phase is arranged between the axial coil parts connected at the coil end part in the circumferential direction, and the coil end part of a different phase A slotless rotating electrical machine (11) arranged so that the two slots overlap in the axial direction,
The coil includes a U-phase coil, a V-phase coil, and a W-phase coil,
An insulating member ( 74v, 74w) is interposed between the coil end portions of different phases,
A plurality of portions are provided in the circumferential direction where the coil end portions of different phases overlap in the axial direction, and the insulating member (74v, 74w) is interposed between the coil end portions of different phases in a plurality of ranges in the circumferential direction. A plurality of them are provided in the circumferential direction, so that
The coil end portions of different phases have different protruding lengths in the radial direction when viewed from the axial direction, and the coil end portions of different phases are different from the coil end portion of V phase . The coil end portion of the U phase overlaps the coil end portion of the V phase and the fixed member side in the axial direction and protrudes in the radial direction from the coil end portion of the V phase , and the coil end portion of the V phase and the shaft. the W- phase coil end portion that overlaps with the opposite side of the fixing member in the direction and does not protrude in the radial direction than the V-phase coil end portion;
The insulating member (74v) interposed between the V-phase coil end portion and the U-phase coil end portion is interposed between the V-phase coil end portion and the W-phase coil end portion. The slotless rotating electrical machine is formed to have a longer radial length than the insulating member (74w) . The slotless rotating electric machine according to claim 1, wherein the coil end portions (22, 22u, 22v, 22w) are bent in a radial direction from an end of the axial coil portion and arranged to overlap in the axial direction. The U-phase coil end portion (2 2 u) is placed on the fixed member in the axial direction,
The slotless rotating electric machine according to claim 2, wherein an inter-stationary member insulating member (33) is interposed between the U-phase coil end portion and the stationary member. The U-phase coil end portion (2 2 u) is placed on the fixed member in the axial direction,
A bending part insulating member (72) is interposed between the bending part (71) between the U-phase axial coil part and the U-phase coil end part and the fixing member. The slotless rotating electrical machine according to claim 2 or claim 3. The slotless rotating electric machine according to any one of claims 1 to 4, wherein the insulating member is fixed to the coil end portion. The coil (16) has the axial coil portion (21, 21u, 21v, 21w) and the coil end portion (22, 22u, 22v, 22w) bent in the radial direction from the end of the axial coil portion. , 16u, 16v, 16w) and the fixing member (15) on which the coil end portion is placed in the axial direction. (11) A manufacturing method,
a placing step of placing the U -phase coil end portion in the axial direction of the fixing member; and after the placing step, an insulating member (7 4 v) is placed in the axial direction of the U-phase coil end portion; After the insulating member arranging step and the insulating member arranging step, the V-phase coil end portion is arranged so that the insulating member is sandwiched between the U-phase coil end portion placed in the placement step. a sandwiching step, an insulating member placement step of arranging an insulating member (74w) in the axial direction of the V-phase coil end portion, and after the insulating member placement step, the insulating member is sandwiched between the V-phase coil end portion. A method for manufacturing a slotless rotating electrical machine , comprising: a sandwiching step of arranging the W-phase coil end portions as shown in FIG . The coil (16) has the axial coil portion (21, 21u, 21v, 21w) and the coil end portion (22, 22u, 22v, 22w) bent in the radial direction from the end of the axial coil portion. , 16u, 16v, 16w) and the fixing member (15) on which the coil end portion is placed in the axial direction. (11) A manufacturing method,
A placing step of placing the U -phase coil end portion in the axial direction of the fixing member, and after the placing step, placing the V-phase coil end portion in the axial direction of the U-phase coil end portion. an overlapping arrangement step of arranging the W-phase coil end portion in the axial direction of the V-phase coil end portion , and after the overlapping arrangement step, the U-phase coil end portion and the V-phase coil end portion. and inserting insulating members ( 74v, 74w) between the coil end portions of the V-phase and the coil end portions of the W-phase, respectively .