JP2013150548A - Stator winding, stator, and rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of keeping height of a coil end low and miniaturizing the coil end.SOLUTION: Two coils of stator windings that are mutually connected comprise: a first coil having an inner circumferential side coil terminal 212 drawn in a direction of a coil end 220 of a stator winding from an inner circumferential side of a slot; and a second coil having an outer circumferential side coil terminal 211 that is drawn in the direction of the coil end 220 of the stator winding from an outer circumferential side of the slot and is connected to the inner circumferential side coil terminal 212. The two coils have such a coil terminal connection structure that the inner circumferential side coil terminal 212 and the outer circumferential side coil terminal 211 are connected so as to stride over the coil end 220, and connection portions 211a and 212a are bent so as to allow the connection portions 211a and 212a to be closer to the coil end 220.

Description

  The present invention relates to a rotating electrical machine such as a motor and a generator, and a stator winding used in the rotating electrical machine.

  There are two types of stator windings: concentrated winding for concentrating coils for each magnetic pole tooth, winding coils across multiple slots, and coils with different or in-phase overlap at the coil end. There is a distributed winding. Concentrated-winding stators can reduce the coil end and are effective in reducing the size and efficiency of rotating electrical machines. On the other hand, the rotating magnetic field formed on the inner periphery of the stator does not distribute smoothly, so harmonics There is a drawback that noise due to the noise is likely to occur. On the other hand, a distributed winding stator that has been conventionally used can generally make the rotating magnetic field of the inner circumference of the stator closer to a sine wave, and can reduce noise compared to concentrated winding. However, there are many overlapping coils at the coil end, and its volume is larger than that of concentrated winding, and there are problems in miniaturization and high efficiency.

  For example, in a motor for a driving main machine of an electric vehicle, there is a restriction on a mounting space, and a high output must be obtained with a limited battery voltage. There is a strong demand for miniaturization and high output at an extremely high level. One of the means to achieve this is to use a wire with a substantially rectangular cross section for the copper wire of the coil, and the coil space factor in the stator slot There is a way to increase. Application of the rectangular cross-section line to the concentrated winding stator is relatively easy due to the simple shape of the coil. In addition, there are Patent Document 1, Patent Document 2, and the like as examples in which concentrated winding stator coils are continuously formed by rectangular cross-section lines.

  However, when the distributed winding stator coil has a substantially rectangular cross-sectional line, it is necessary to avoid interference between the strands while maintaining the alignment of the strands. Conventionally, a concentric winding three-phase coil as shown in Patent Document 3 has been used as means for solving this problem. The structure of the coil end of the three-phase coil is formed by laminating the U phase, the V phase, and the W phase in the axial direction, and assembling so that they do not overlap each other, thereby avoiding interference between different coils. .

Japanese Patent Laid-Open No. 2004-80860 JP 2006-288123 A JP 2006-101654 A

However, there is a problem that the dimensions of the coil ends are increased because the wires formed by lamination at the coil ends are incorporated by being formed by changing the coil end shape of each phase so that they do not interfere with each other.
The embodiment described below is a problem to be solved by the above invention and can solve a problem different from the contents of the description. These are important issues in product production and will be described below.

According to a first aspect of the present invention, there is provided a rotating electrical machine according to the first aspect of the present invention, wherein the stator includes a stator core formed with a plurality of slots, and a stator winding formed by connecting a plurality of coils held in the slots. And a rotor having a surface facing the stator core and rotatably held through a gap, and transferring magnetic flux between the stator core and the rotor on the faces facing each other via the gap. A rotating electrical machine in which a magnetic circuit is made, and two coils connected to each other of a stator winding have a tip end coil terminal, one of which is drawn out in the coil end direction of the stator winding on the tip end side of the slot. The other of the two coils has a bottom side coil terminal that is pulled out toward the coil end direction of the stator winding on the bottom side of the slot and connected to the front end side coil terminal. Bottom carp along the end Turn crawl to the terminal side, is connected to the bottom side coil terminals, the tip of the connecting portion between the distal end side coil end and the bottom-side coil terminals, and wherein the facing radial outer peripheral side.
According to a second aspect of the present invention, a rotating electrical machine includes a stator having a stator winding formed by connecting a plurality of coils in a plurality of slots formed in the stator core, and a rotor provided rotatably inside the stator. And the two coils connected to each other of the stator winding include a first coil having a distal end side coil terminal drawn in a coil end direction of the stator winding on the distal end side of the slot. And a second coil having a bottom coil terminal that is drawn out in the coil end direction of the stator winding on the bottom side of the slot and connected to the tip coil terminal, of the tip coil terminal and the bottom coil terminal Either one of the coil ends is passed through the gap between the coil ends and pulled out to the other coil terminal side, and the coil terminal connection structure is provided in which the drawn coil terminal is connected to the other coil terminal. The features.
According to a fourth aspect of the present invention, a rotating electrical machine includes a stator core having a plurality of slots formed therein, a stator having a stator winding formed by connecting a plurality of coils held in the slots, and the stator core. And a rotor that is rotatably held through a gap, and a magnetic circuit that transfers magnetic flux to the stator core and the rotor on the faces that are opposed to each other through the gap. The two coils connected to each other of the stator winding have a distal end side coil terminal that is drawn in the coil end direction of the stator winding at the distal end side of the slot. The other of the two coils has a bottom coil terminal that is pulled out in the coil end direction of the stator winding on the bottom side of the slot and is connected to the tip coil terminal. Either carp When the coil terminal is wound around the end toward the other coil terminal, connected to the other coil terminal, and the tip coil terminal is wound around the other coil terminal, the tip coil terminal and the bottom coil terminal When the bottom coil terminal is wound around the other coil terminal side, the connection part between the tip coil terminal and the bottom coil terminal is connected to the stator core. It is characterized in that it is bent to the outer peripheral side.
According to a fifth aspect of the present invention, there is provided a rotating electrical machine including a stator core having a plurality of slots, a stator having a stator winding formed by connecting a plurality of coils held in the slots, and the stator core. And a rotor that is rotatably held through a gap, and a magnetic circuit that transfers magnetic flux to the stator core and the rotor on the faces that are opposed to each other through the gap. The two coils connected to each other of the stator winding have a distal end side coil terminal that is drawn in the coil end direction of the stator winding at the distal end side of the slot. The other of the two coils has a bottom coil terminal that is pulled out in the coil end direction of the stator winding on the bottom side of the slot and is connected to the tip coil terminal. Either carp It is characterized in that it is wound around the other coil terminal side along the end, connected to the other coil terminal, and the connection portion between the tip side coil terminal and the bottom side coil terminal is bent in the circumferential direction of the coil end. To do.
According to a sixth aspect of the present invention, there is provided a rotating electrical machine including a stator core including a plurality of slots, a stator winding formed by connecting a plurality of coils held in the slots, and the stator core. And a rotor that is rotatably held through a gap, and a magnetic circuit that transfers magnetic flux to the stator core and the rotor on the faces that are opposed to each other through the gap. The two coils connected to each other of the stator winding have a distal end side coil terminal that is drawn out in the coil end direction of the stator winding at the distal end side of the slot, The other of the two coils has a bottom coil terminal that is pulled out in the coil end direction of the stator winding on the bottom side of the slot and is connected to the tip coil terminal. Either The coil terminal was wound around the coil end toward the other coil terminal, connected to the other coil terminal, and the connecting portion between the tip coil terminal and the bottom coil terminal was bent so as to overlap the coiled coil terminal. It is characterized by.
The invention of claim 12 is a stator winding used in a rotating electrical machine configured by connecting a plurality of coils arranged in slots of a stator core, and two coils connected to each other are one of them. Has a distal end coil terminal that is drawn in the coil end direction on the distal end side of the slot, and the other of the two coils is connected to the distal end coil terminal so that the other coil is drawn in the coil end direction on the bottom side of the slot A distal end coil terminal and a bottom coil terminal are bent toward the radially outer periphery of the coil end, and the distal end coil terminal crawls along the coil end toward the bottom coil terminal side. And connected to the bottom coil terminal, and the tip of the connecting portion between the tip side coil terminal and the bottom side coil terminal is directed to the radially outer peripheral side.

ADVANTAGE OF THE INVENTION According to this invention, coil end height in the stator of a rotary electric machine can be restrained low and size reduction of a coil end can be achieved.
The embodiment described below can solve the problems described below in addition to the effects described above, and has the effects described below. The problems and effects described below are very important problems and effects in producing a product. The content that the inventors have studied deeply for commercialization is described as an embodiment, and the embodiment described below is not limited to the above-mentioned problems related to miniaturization, but has various aspects that are important in terms of commercialization. It solves the problems and produces effects. The problems and effects to be solved will be described next.

It is side surface sectional drawing of the induction type rotary electric machine of one Embodiment. It is sectional drawing which shows the stator of an induction type rotary electric machine. It is a perspective view which shows the cross section of the rotor of an induction type rotary electric machine. It is a connection diagram of the stator coil 413 connected in 2Y. It is a figure which shows the detail of the coils U11 and U12, (a) shows before connection, (b) shows after connection, respectively. It is a figure which shows the arrangement | positioning relationship of the coil which comprises the slot 411 and the stator coil 413. FIG. It is a perspective view which shows the mode of the coil before the connection with which it attached in 412 in a stator core. It is a figure which shows the 1st connection structure of the conductor terminal 211,212. It is a figure explaining the 2nd connection structure of conductor terminal 211,212. It is a figure explaining the 3rd connection structure of conductor terminal 211,212. It is a figure explaining the 4th connection structure of conductor terminal 211,212. It is a figure explaining the 5th connection structure of conductor terminal 211,212. It is a figure explaining the 6th connection structure of conductor terminal 211,212. It is a figure explaining the 7th connection structure of conductor terminal 211,212. It is a figure which shows the modification of a 7th connection structure. It is a figure explaining the 8th connection structure of conductor terminal 211,212. It is a figure which shows the modification of an 8th connection structure, (a) shows a 1st modification, (b) shows a 2nd modification, respectively.

The embodiment described below solves the problems described below and has the effects described below. These problems and effects to be solved overlap with the problems and effects to be solved, but many are different problems and effects.
[Improve productivity]
In the following embodiment, a coil wound once or a plurality of times is used as shown in FIG. The coil has first and second insertion portions that are inserted into the slot, and first and second coil ends that connect the first and second insertion portions. As shown in FIGS. 5 to 7, for example, when the first insertion portion is disposed on the back side (bottom side) of the slot, the second insertion portion is positioned on the opening side (tip side) of the slot. Be placed. A second insertion portion of another coil is disposed on the opening side (tip side) of the slot where the first insertion portion is located. Further, a first insertion portion of another coil is arranged on the back side (bottom side) of the slot where the second insertion portion is located. The coils constituting the three-phase stator winding are arranged over the entire circumference of the stator in the slot in such an arrangement relationship.
Each said coil is formed with the continuous conducting wire, and the welding process for connecting the 1st insertion part and the 2nd insertion part for forming a coil, for example is unnecessary. Therefore, the structures of the following embodiments are structures that improve productivity. The following embodiments have a structure in which the number of connection points in the entire stator winding is relatively small and productivity is improved.
Further, as shown in FIG. 5 and FIG. 6, the two coils can be formed by a continuous conducting wire by adopting a structure in which the two coils are arranged in close slots. By adopting such a structure, the number of connection points in the entire stator can be reduced, and productivity is improved. Further, by reducing the number of connection points, the electrical characteristics are improved, and further miniaturization is possible.
As shown in FIG. 5 and FIG. 7 to FIG. 13, since the connection portion (reference numeral 211 a and 212 a in the figure) of the conductor terminal is located outside the first and second coil ends forming the coil, Work is easy and productivity is excellent. Furthermore, the overall structure is simplified, leading to downsizing and improved reliability.
Moreover, since the connection part of the said conductor terminal has a structure located only in the one side of the 1st and 2nd coil end which forms the said coil, it is a structure which improves productivity.
〔Performance Improvement〕
The coil having the first and second insertion portions is configured to be wound once or a plurality of times. By changing the number of turns, the number of conductors stacked in the direction from the opening in the slot toward the back (radial direction of the rotating machine) can be changed. That is, a structure in which the first insertion portion of the coil formed by winding once or a plurality of times is arranged on the back side (bottom side) of the slot, and the second insertion portion is arranged on the opening side (tip side) of the slot. Therefore, by setting the number of turns of the coil in accordance with the characteristics, the number of the conductive wires in the slot can be set to an appropriate number. Such a structure makes it easier to obtain a rotating electrical machine having suitable characteristics. Note that the above-described Patent Documents 1 to 3 described in the Background Art section do not disclose the arrangement structure of the coils.
As shown in FIG. 5 and FIG. 6, the coil portion (for example, each of U11 or U12, V11, V12) constituting the same phase or the same phase is constituted by a plurality of coils, and the plurality of coils are arranged in adjacent slots. Thus, in these close coils, the first insertion part of each coil is arranged on the back side (bottom side) of the slot, and the second insertion part is arranged on the opening side (tip side) of the slot. In addition to improving productivity, it also excels in performance.
〔Miniaturization〕
As described above in the column of the problem to be solved by the invention regarding the downsizing, the following viewpoints greatly contribute to the downsizing of the rotating electrical machine.
As shown in FIG. 5 to FIG. 7, a coil wound once or a plurality of times is used, and the coil includes first and second insertion portions to be inserted into the slot, and the first and second insertion portions. It has first and second coil ends that connect two insertion parts, and the coil is made of a continuous wire, and the first and second insertion parts are connected by welding or the like to form a coil. Since the structure is not such that the coil itself is small. Also, the stator or the entire rotor is reduced in size.
Since the first insertion part of the coil is arranged on the back side of the slot and the second insertion part is arranged on the opening side of the slot, it is possible to form the coil using a conductor having a substantially rectangular cross section. Thus, the conductor can be laminated in the short side direction of the substantially rectangular conductor cross section. By using a conductor with a substantially rectangular cross section, the performance is improved, and furthermore, by laminating the conductor in the short side direction, that is, by laminating the conductor in the direction in which the conductor surfaces on the long side of the substantially rectangular cross section face each other. , Leading to miniaturization of the stator. Thereby, the whole rotary electric machine is also reduced in size.

  Hereinafter, the best mode for carrying out the invention will be described with reference to the drawings, taking an induction type rotating electrical machine as an example. This rotating electric machine is used in a drive system of a hybrid vehicle or the like, and has both a function of a driving motor for driving wheels and a function of a generator for generating power. The rotating electrical machine is used, for example, for starting an engine that is stopped, used for generating torque for traveling the vehicle together with the engine, or used for traveling the vehicle with a single torque.

  FIG. 1 is a side sectional view of an induction type rotating electrical machine, FIG. 2 is a diagram showing a cross section of a stator, and FIG. 3 is a perspective view showing a cross section of the rotor. The induction type rotating electrical machine includes a bottomed cylindrical housing 1 that is open at one end in the axial direction, and a cover 2 that seals the open end of the housing 1. The housing 1 and the cover 2 are fastened by a plurality of, for example, six bolts 3. A water channel forming member 22 is provided inside the housing 1, and the stator 4 is fixed inside the water channel forming member 22 by shrink fitting or the like. A flange at the left end of the water channel forming member 22 is fixed between the housing 1 and the cover 2, and a water channel 24 is formed between the water channel forming member 22 and the housing 1. Cooling water for cooling the rotating electrical machine is taken into the water channel 24 from the intake port 32 formed in the housing 1 and then discharged from the discharge port 34 of the housing 1.

  The stator 4 includes a stator core 412 in which a plurality of slots 411 are provided at equal intervals in the circumferential direction, and a three-phase stator coil 413 wound in each slot 411. In the induction type rotating electrical machine according to the present embodiment, the stator coil 413 having an 8-pole configuration is connected by star connection, and each phase has a 2Y connection in which a pair of winding portions are connected in parallel. Forty-eight slots 411 are formed in the stator core 412 around which the stator coil 413 is wound. The stator core 412 is formed of a laminated steel plate formed by punching or etching a magnetic steel plate having a thickness of 0.05 to 0.35 mm, for example, and laminating the formed electromagnetic steel plates, and the like in the circumferential direction. A plurality of slots 411 arranged in a radially spaced manner are formed.

  On the inner peripheral side of the stator core 412, the rotor 5 is rotatably arranged so as to face the stator core 412 with a minute gap. The rotor 5 is fixed to the shaft 6 and rotates integrally with the shaft 6. The shaft 6 is rotatably supported by a pair of ball bearings 7a and 7b provided on the housing 1 and the cover 2, respectively. Of these bearings 7a and 7b, the bearing 7a on the cover 2 side is fixed to the cover 2 by a fixing plate (not shown), and the bearing 7b on the bottom side of the housing 1 is a recess provided at the bottom of the housing 1. It is fixed to.

  A pulley 12 is attached to the left end of the shaft 6 with a nut 11. A sleeve 9 and a spacer 10 are provided between the pulley 12 of the shaft 6 and the bearing 7a. The outer periphery of the sleeve 9 and the inner periphery of the pulley 12 have a slightly conical shape, and the pulley 12 and the shaft 6 are firmly integrated by the tightening force of the nut 11 so that they can rotate integrally. Yes. When the rotor 5 is rotationally driven with respect to the stator 4, the rotational force of the shaft 6 is output to the outside by the pulley 12. Moreover, when functioning as a generator, the rotational force from the pulley 12 is input into the shaft 6.

  As shown in FIG. 3, a plurality of conductor bars 511 extending in the rotation axis direction are embedded in the rotor core 513 of the rotor 5, which is a cage rotor, at equal intervals over the entire circumference in the circumferential direction. Yes. The rotor core 513 is made of a magnetic material, and short-circuit rings 512 for short-circuiting the conductor bars 511 are provided at both ends of the rotor core 513 in the axial direction. In addition, in the perspective view of FIG. 3, in order to clarify the relationship between the rotor core 513 and the conductor bar 511, a cross-sectional structure taken along a plane perpendicular to the rotation axis is shown, and the short-circuit ring 512 on the pulley 12 side and The shaft 6 is not shown.

  The rotor core 513 is formed of a laminated steel plate formed by punching or etching a magnetic steel plate having a thickness of 0.05 to 0.35 mm and laminating the formed electromagnetic steel plates. As shown in FIG. 3, substantially fan-shaped cavities 514 are provided at equal intervals in the circumferential direction on the inner peripheral side of the rotor core 513 for weight reduction. The conductor bar 511 described above is embedded on the outer peripheral side of the rotor core 513, that is, the stator side, and a magnetic circuit is formed in the rotor yoke 530 inside the conductor bar 511. Each conductor bar 511 and the short-circuit ring 512 are made of aluminum, and are integrated with the rotor core 513 by die casting. The short-circuit rings 512 arranged at both ends of the rotor core are provided so as to protrude from the rotor core 513 to both ends in the axial direction. Although not shown in FIG. 1, a detection rotor for detecting the rotation of the rotor 5 is provided on the bottom side of the housing 1. The rotation sensor 13 detects the teeth of the rotating detection rotor and outputs an electrical signal for detecting the position of the rotor 5 and the rotation speed of the rotor 5.

  FIG. 4 is a connection diagram of the 2Y-connected stator coil 413, in which the driving secondary battery 612 and the DC terminal of the inverter device 620 are electrically connected. The AC terminal of the inverter device 620 is electrically connected to the stator coil 413. DC power is supplied from the secondary battery 612 to the inverter device 620, and AC power is supplied from the inverter device 620 to the three-phase stator coil 413 wound around the stator core 412. The stator coil 413 generates a rotating magnetic field having a rotation speed corresponding to the frequency of the AC power.

  In the present embodiment, the stator coil 413 has two star connections Y1, Y2. The Y1 connection has a U-phase winding Y1U, a V-phase winding Y1V, and a W-phase winding Y1W. The Y2 connection has a U-phase winding Y2U, a V-phase winding Y2V, and a W-phase winding Y2W. The Y1 connection and the Y2 connection are connected in parallel, and each neutral point is also connected. Winding Y1U is composed of coil U11, coil U12, coil U13 and coil U14 connected in series. The winding Y2U includes a coil U21, a coil U22, a coil U23, and a coil U24 connected in series. Similarly, the winding Y1V is composed of coils V11 to V14 connected in series, the winding Y2V is composed of coils V21 to V24 connected in series, and the winding Y1W is composed of coils W11 to W14 connected in series. The winding Y2W is composed of coils W21 to W24 connected in series.

  In the present embodiment, a lap winding that can reduce the size of the coil end is adopted among the distributed windings, and each of the coils U11 to W24 has two consecutive sets of coils 4131a as shown in FIG. , 4131b. Coils 4131 a and 4131 b having the same number of turns (for example, 3 turns) are continuous via the crossing conductor 4134. The winding method of the coils 4131a and 4131b is α winding, but may be forward winding. In the rotating electric machine of the present embodiment, 24 sets of two sets of coils 4131a and 4131b are used, and each of the coils 4131a and 4131b previously wound as shown in FIG. 5A corresponds to the stator core 412. The slot 411 is fitted from the inside.

  In FIG. 4, the two coils 4131a and 4131b constituting the coil U11 are indicated by numerals 2 and 1, respectively. In FIG. 2, the two coils 4131a and 4131b constituting the coil U11 and the winding state of the two coils 4131a and 4131b constituting the coil U12 are schematically shown by a broken line (4131a) and a solid line (4131b). Has been. Although details will be described later, each of the coils 4131a and 4131b is wound between a pair of slots 411 with four slots interposed therebetween.

  For example, in the case of the coil 4131b constituting the coil U11, the coil 4131b is wound between the slot of number 1 and the slot of number 6, and the slot of number 1 is arranged on the rotor side (tip side). In the slot, it is arranged on the bottom side. On the other hand, the coil 4231a is wound between the tip side of the number 2 slot and the bottom side of the number 7 slot. Similarly, the coil 4131a of the coil U12 is wound over the slot 411 of the number 38 and the number 43, and the coil 4131b of the coil U12 is wound over the slot 411 of the number 37 and the number 42. Note that how many slots are sandwiched between a pair of slots around which the coil is worn depends on the total number of slots, the number of phases, etc., and is not necessarily four.

  In FIG. 4, the coil 4131a of the coil U11 is represented by numeral 2, and the coil 4131b is represented by numeral 1. These numerals 1 and 2 are slots in the slot 411 in which the coils 4131a and 4131b are arranged. The slot number arranged on the front end side is shown. The slot number is a number assigned in order in the circumferential direction with an arbitrary slot 411 of 48 slots 411 as number 1. The coil 4131a is wound over the slot 411 of number 2 and the slot 411 of number 7, and is inserted into the rotor side (slot tip side) in the slot 411 of number 2, and the slot bottom in the slot 411 of number 7 Is inserted on the side.

  Similarly, the numbers shown for the pair of coils in FIG. 4 represent the slot numbers into which the coils are inserted on the rotor side. Thus, torque pulsation can be reduced by inserting the two coils 4131a and 4131b in a pair into the adjacent slots 411.

  FIG. 6 is a diagram showing the positional relationship between the coils constituting the slot 411 and the stator coil 413. The numbers shown in the column 442 in FIG. 6 indicate the slot numbers 1 to 48 described above. For example, the two coils 4131a and 4131b constituting the coil U11 (that is, the coils given the numbers 2 and 1 in FIG. 4) are inserted on the rotor side of the slots 411 having the numbers 2 and 1. In FIG. 6, to make it easier to understand, U11 is added to the margin below the numbers 2 and 1. For example, in column 442, coil W13 is represented by numbers 29 and 30. That is, the coil W13 is formed by connecting the coil 4131a disposed on the rotor side of the slot 411 having the slot number 29 and the coil 4131b disposed on the rotor side of the slot 411 having the slot number 30 to form the coil W13. It shows that.

  A column 444 in FIG. 6 shows the phases of the stator windings and the order of arrangement in the phases. As described above, the coils 4131a and 4131b constituting the coil U11 are inserted on the rotor side of the slot 411 having the slot numbers 2 and 1, respectively. The coil U11 is marked “U1” in the column 444. This indicates that the first winding of the U phase in the stator winding, that is, the reference position of the U phase is arranged. The coils 4131a and 4131b constituting the coil U21 are inserted on the rotor side of the slot 411 of the slot numbers 44 and 43 as shown in a column 442, and both are marked "U2" in the column 444. This indicates that the coil U21 is arranged at the second position of the U phase of the stator winding, that is, at a mechanical angle of 45 ° from the reference position of the U phase. Similarly, the coils 4131a and 4131b constituting the coil U12 are respectively inserted on the rotor side of the slot 411 of the slot numbers 38 and 37 as shown in a column 442, and both are marked "U3" in the column 444. . This indicates that the coil U12 is arranged at the third U-phase of the stator winding, that is, at a mechanical angle of 90 ° from the reference position of the U-phase.

  That is, in the winding Y1U shown in FIG. 4, the coil U11 is disposed at the U-phase reference position, and the coil U12, the coil U13, and the coil U14 are respectively third (mechanical angle 90 °) and fifth (mechanical angle) from the reference position. It is arranged at a position of 180 ° and a seventh position (mechanical angle 270 °). On the other hand, as shown in a column 444, the coils U21 to U24 of the winding Y2U are second (mechanical angle 45 °), fourth (mechanical angle 135 °), and sixth (mechanical angle 225) from the U-phase reference position, respectively. °) and the eighth position (mechanical angle 315 °).

  The coil V11 of the winding Y1V is shifted from the coil U11 by two slots 411, that is, by a mechanical angle of 15 °. The position of the coil V11 is the V-phase reference position, and “V1” is indicated in the column 444. The coils V12 to V14 connected in series with the coil V11 of the winding Y1V are the third (mechanical angle) from the reference position of the V phase, as indicated by “V3”, “V5”, “V7” in the column 444. 90 °), 5th (mechanical angle 180 °) and 7th (mechanical angle 270 °). On the other hand, the coil V21 of the winding Y2V indicated as “V2” in the column 444 is at a position shifted by 45 ° in mechanical angle from the position of the coil V11. The other coils V22 to V24 of the winding Y2V are the fourth from the V-phase reference position (mechanical angle 135 °), as indicated by “V4”, “V6”, “V8” in the column 444, 6 It is arranged at the 8th position (mechanical angle 225 °) and the 8th position (mechanical angle 315 °). Thus, since the V-phase coil V11 is shifted by 15 ° in mechanical angle with respect to the coil U11, the V-phase coil is shifted by 15 ° with respect to the U-phase coil. Similarly, since the W-phase coil W11 is shifted by 30 ° in mechanical angle with respect to the coil U11, all the W-phase coils are shifted by 30 ° with respect to the U-phase coil.

  Next, the column 446 will be described. In this embodiment, each coil 4131a, 4131b that circulates has a structure that circulates through two slots. That is, as described above, the coil 4131a of the coil U11 is wound between the number 2 slot 411 and the number 7 slot 411, and in the number 2 slot 411, the winding is disposed on the rotor side in the slot. In the slot 411 having the number 7, the winding is disposed on the slot bottom side of the slot 411. A column 446 displays the bottom slot number. For example, the coil 4131b of the coil U11 circulates between the first and sixth slots, and is arranged on the rotor side in the first slot 411 and on the slot bottom side in the sixth slot 411.

  A column 448 indicates the phase of the coil located on the slot bottom side of the slot 411 indicated by the number in the column 442 and the order of arrangement of the coils in that phase. Further, the reference numerals described in the column 450 indicate slots around the coil described in the column 448. For example, the coil 4131a of the coil U11 is inserted on the rotor side of the slot 411 of the slot number 2 as shown in the column 422. On the other hand, the coil inserted into the bottom side of the slot 411 having the slot number 2 is the coil 4131b of the coil V21 having the rotor side inserted into the slot 411 having the slot number 45. Therefore, the number 45 is described in the column 450. In addition, a symbol “V2” indicating that this coil is a V-phase second coil is described in a column 448.

  FIG. 7 shows a state before 24 coils (coils U11 to W24) are mounted in the slots of the stator core 412 and the coils are connected to each other. Each of the coils U11 to W24 is configured by a two-continuous α-winding coil including two coils 4131a and 4131b that are continuous by a transition conductor portion 4134, as shown in FIG. In the lap winding, as shown in FIG. 7, the conductor terminals 211 and 212 of the coils U11 to W24 are concentrated on one side in the axial direction of the stator core 412, and the 48 conductor terminals 211 and 212 are located above the coil end 220 in the drawing. Has been pulled out. These conductor terminals 211 and 212 are connected to conductor terminals 211 and 212 of adjacent coils to be connected in series as shown in FIG.

  Each of the coils U11 to W24 includes two coils 4131a and 4131b. The conductor terminal 211 of the coil 4131a is drawn from the slot bottom side of the slot 411, and the conductor terminal 212 of the coil 4131b is drawn from the rotor side of the slot 411. . For example, in the case of the coil U11, as shown in FIG. 4, the coil 4131a is wound between a pair of slots 411 indicated by slot number 2 (rotor side) and number 7 (slot bottom side), respectively. The coil winding start from which the conductor terminal 211 is drawn is on the slot side of the slot number 7 (see FIG. 5A)). On the other hand, the coil 4131b of the coil U11 is wound between a pair of slots 411 indicated by slot number 1 (rotor side) and number 6 (slot bottom side), respectively, and the coil end from which the conductor terminal 212 is drawn out. The end is the slot side of slot number 1.

  When connecting the coil U11 and the coil U12, as shown in FIG. 5B, the conductor terminal 212 of the coil 4131b constituting the coil U11 and the conductor terminal 211 of the coil 4131a constituting the coil U12 are connected. . In that case, the conductor terminal 212 drawn to the rotor side (slot tip side) and the conductor terminal 211 drawn to the slot bottom side must be connected so as to straddle the coil end 220. On the other hand, in order to reduce the size of the rotating electrical machine, it is necessary to keep the height of the coil end 220 as low as possible. Below, the connection structure which can suppress coil end height is demonstrated regarding the connection of the conductor terminal 212 of the inner peripheral side of the coil end 220, and the conductor terminal 211 of the outer peripheral side of the coil end 220. FIG.

(First connection structure)
FIG. 8 is a view showing a first connection structure of the conductor terminals 211 and 212. The coil U11 and the coil U12 shown in FIG. 5A are shifted by 90 ° in mechanical angle as can be seen from FIG. However, as shown in FIG. 5, when the coils U11 and U12 are connected, the conductor terminal 212 on the coil 4131b side of the coil U11 and the conductor terminal 211 on the coil 4131a side of the coil U12 are connected. As shown in FIG. 2, the conductor terminal 212 on the coil 4131 b side of the coil U <b> 11 is disposed on the distal end side of the slot 411 of number 1, and the conductor terminal 211 on the coil 4131 a side of the coil U <b> 12 is on the bottom end side of the slot 411 of number 43. Is arranged. Therefore, the conductor terminal 211 of the coil U11 to be connected and the conductor terminal 211 of the coil U12 are shifted by 45 ° in mechanical angle.

  Therefore, first, as shown in FIG. 8A, the outer conductor terminal 211 is spirally wound in the direction of the inner conductor terminal 212 along the coil end 220 to connect the conductor terminal 211. 211a is made to oppose the conductor terminal 212 along a radial direction. Here, the spiral shape describes the state in which the conductor terminal 211 is wound slightly inward along the coil end 220. In addition, since the conductor terminal 211 on the outer peripheral side is wound in this spiral shape, the terminal length is set longer than that of the conductor terminal 212 on the inner peripheral side. In FIG. 8, the coil end 220 is shown in a cylindrical shape for convenience.

  Next, as shown in FIG. 8B, the inner peripheral side conductor terminal 212 is wound in the radial direction along the coil end 200 so that the connection portion 212 a of the conductor terminal 212 is brought close to the connection portion 211 a of the conductor terminal 211. . Note that, in order to prevent damage to the coating of the coil end 220 due to the influence of heat at the time of connection, the connection portions 211 a and 212 a are arranged at a certain distance from the coil end 220. In the conductor terminals 211 and 212 having a shape as shown in FIG. 8B, the conductor terminals 211 and 212 are divided into connecting portions 211a and 212a and scooping portions 211b and 212b. Next, the connecting portions 211a and 212a are connected by TIG welding or the like. In addition, although it is the same below, as a connection method, in addition to TIG welding, fusing, fusing brazing, resistance brazing, etc. may be used.

  When the connection of the conductor terminals 211 and 212 is completed, the connection portions 211a and 212a are bent toward the outer peripheral side in the radial direction of the coil end 220 as shown in FIG. Thus, the conductor terminal 212 is wound in the radial direction from the inner peripheral side to the outer peripheral side of the coil end 220, and the connecting portions 211a and 212a are further bent to the outer peripheral side, so that the coil end height is the coil end before connection. Only the width of the conductor terminal 212 is added to the height of 220, so that the coil end height can be kept low. When a conductor having a rectangular cross section (flat rectangular conductor) is used for the stator coil 314, the connection portions 211a and 212a are connected so that the long sides face each other, thereby making the connection more reliable. In addition, the increase in coil end height can be suppressed to the short side dimension. Of course, as shown in FIG. 8D, the short sides of the connecting portions 211a and 212a may be connected to face each other in the circumferential direction.

  In addition, since the core back side of the coil end 220 is an empty space, the connecting portions 211a and 212a may be further bent in the core back direction as indicated by broken lines. By bending the connecting portions 211a and 212a in the direction of the arrow AL so as to have a shape indicated by a broken line, the outer diameter of the coil end including the connecting portions 211a and 212a can be kept small. In particular, this is effective when the dimension of the stator core 412 in the core back radial direction is small, and the connecting portions 211a and 212a can be prevented from projecting laterally from the outer peripheral surface of the stator core 412.

  In addition, when there is a space for bending the connection portions 211a and 212a on the inner peripheral side of the coil end 220, the connection portions 211a and 212a may be bent on the inner peripheral side. Further, instead of the conductor terminal 211 on the outer peripheral side, the conductor terminal 212 on the inner peripheral side may be spirally wound in the direction of the conductor terminal 11, or spirally formed so that both the conductor terminals 211 and 212 are close to each other. You may crawl on.

(Second connection structure)
FIG. 9 is a diagram illustrating a second connection structure in the present embodiment. First, as in the case of the first connection structure, as shown in FIG. 9A, the outer peripheral side conductor terminal 211 is spirally wound along the coil end 220, and the connection portion 211a is connected to the inner peripheral side. It is made to oppose the conductor terminal 212. FIG. Next, as shown in FIG. 9B, the conductor terminal 212 on the inner peripheral side is wound in the radial direction along the coil end 200 so that the connection part 212 a of the conductor terminal 212 is brought close to the connection part 211 a of the conductor terminal 211. . Thereafter, the connecting portions 211a and 212a are connected by TIG welding or the like. The procedure so far is the same as in the case of the first connection structure described above.

  Next, as shown in FIG. 9C, the connecting portions 211 a and 212 a are bent in the circumferential direction along the upper end or outer periphery of the coil end 220. By adopting such a connection structure, the coil end height is obtained by adding approximately one width of the conductor terminal 212 to the height of the coil end 220 before connection, and the coil end height can be kept low. . In the example shown in FIG. 9B, the long-side surfaces of the rectangular cross sections of the connecting portions 211a and 212a of the rectangular conductor are connected to face each other in the radial direction, but as shown in FIG. 9D. The short sides of the connecting portions 211a and 212a may be connected to face each other in the circumferential direction.

  In the second connection structure, since the connection portions 211a and 212a are bent in the circumferential direction, an empty space above the core back and outside the coil end 220 even if the connection portions 211a and 212a are somewhat long. The connection portions 211a and 212a can be accommodated in the storage space. Therefore, by arranging the connection portions 211a and 212a in FIG. 9B at a height with a margin above the coil end, it is possible to reliably prevent the influence of heat when the coil end 220 is connected to the coating. it can. As in the case of the first connection structure, instead of winding the outer peripheral side conductor terminal 211 in a spiral shape, the inner peripheral side conductor terminal 212 may be wound in a spiral shape.

(Third connection structure)
FIG. 10 is a diagram illustrating a third connection structure in the present embodiment. In the first and second connection structures described above, either one of the conductor terminals 211 and 212 is spirally wound. In the third connection structure, both the conductor terminals 211 and 212 are spirally wound. I did it.

  First, as shown in FIG. 10 (a), the conductor terminal 211 on the outer peripheral side is spirally wound in the direction of the conductor terminal 212 along the coil end 220, and the lead position of the conductor terminal 211 and the lead position of the conductor terminal 212 are drawn. In the vicinity of the intermediate position between the conductor terminal 211, the winding direction of the conductor terminal 211 is slightly directed toward the inner diameter side. The conductor terminal 211 is different from the scooping shape shown in FIG. Next, as shown in FIG. 10B, the inner circumferential conductor terminal 212 is spirally wound in the direction of the conductor terminal 211 along the coil end 220. Then, between the lead-out position of the conductor terminal 211 and the lead-out position of the conductor terminal 212, for example, in the vicinity of the intermediate position, the winding direction of the conductor terminal 212 is turned slightly outward and the right side measurement of the connecting portion 211a of the conductor terminal 211 is performed. The left side surface of the connecting portion 212a of the conductor terminal 212 is brought into contact with the surface and connected by TIG welding or the like. In that case, it is preferable that the side surfaces of the connection portions 211a and 212a face each other at a fixed distance above the coil end 220 so that heat at the time of connection does not affect the coil end coating.

  Next, as shown in FIG. 10C, the connection portions 211 a and 212 a are tilted so as to be in close contact with the coil end 220. As a result, the coil end height is only the width of the conductor terminal 212 added to the height of the coil end 220 before connection, and the coil end height can be kept low. When a rectangular conductor having a rectangular cross-section is used, the short sides of the rectangular shape are connected to each other. Therefore, the increase in coil end height due to the connecting portions 211a and 212a is suppressed to the size of the short side. It is done.

(Fourth connection structure)
FIG. 11 is a diagram for explaining a fourth connection structure in the present embodiment. In the first to third connection structures described above, the conductor terminals 211 or 212 are wound so as to straddle the coil end 220 to connect the connection portions 211a and 212a. However, in the fourth connection structure described below, one of the conductor terminals 211 and 212 passes through the coil end 220 and is drawn out to the other side to connect the connection portions 211a and 212a.

  As shown in FIG. 11A, first, the outer peripheral side conductor terminal 211 is spirally wound in the direction of the conductor terminal 212 along the outer periphery of the coil end 220. Then, the conductor terminal 211 is made to penetrate the gap between the coils of the coil end 220 in the radial direction, for example, radially through the teeth of the stator core 412, and the conductor terminal 211 is connected to the coil end 220. Pull it out to the inner circumference. Next, the connection part 211 a of the drawn conductor terminal 211 is connected to the connection part 212 a of the conductor terminal 212. In that case, as shown to Fig.11 (a), the connection parts 211a and 212a are arrange | positioned so that it may leave | separate from the coil end 220 for a fixed distance, and the heat at the time of a connection does not affect a coil end film | membrane.

  Next, as shown in FIG. 11B, the connecting portions 211 a and 212 a are bent in the radial direction along the coil end 220. When a rectangular conductor having a rectangular cross section is used for the coil, the coil ends are connected by connecting the surfaces corresponding to the short sides, that is, the side surfaces, as shown in FIG. The height can be set to a height obtained by adding one width in the short side direction of the conductor terminal to the coil end height before connection. Instead of penetrating the outer peripheral conductor terminal 211 to the inner peripheral side, the inner peripheral conductor terminal 212 may be penetrated to the outer peripheral side and connected to the conductor terminal 211. In that case, the connecting portions 211a and 212a are bent toward the inner peripheral side.

  Further, the outer peripheral connection portions 211 a and 212 a may be bent along the outer periphery of the coil end 220. Since this is an empty space above the coil back, the empty space can be used effectively. Also in this case, the side surfaces of the connecting portions 211a and 212a may be connected to each other, or the long sides of the connecting portions 211a and 212a may be connected to face each other.

(Fifth connection structure)
FIG. 12 is a diagram for explaining a fifth connection structure in the present embodiment. First, as shown in FIG. 12A, the outer peripheral side conductor terminal 211 is spirally wound around the coil end 220 to the inner peripheral side. Then, the conductor terminal 211 is folded back 180 ° on the inner peripheral side of the coil end 220, and the connection part 211 a is connected to the connection part 212 a of the conductor terminal 212 on the inner peripheral side. The connecting portions 211a and 212a are arranged so that the short side surfaces of the flat conductors face each other, and are connected by TIG welding or the like. As in the case of the fourth connection structure, the connection portions 211a and 212a are arranged so as to be apart from the coil end 220 by a certain distance so that the heat at the time of connection does not affect the coil end coating.

  Next, as shown in FIG. 12B, the connecting portions 211 a and 212 a are bent in the radial direction along the coil end 220. Also in the case of this fifth connection structure, the coil end height is simply the width of the conductor terminals 211 and 212 in the short side direction added to the coil end height before connection, and the coil end height is reduced. Can be suppressed. In addition, the inner peripheral side conductor terminal 212 is wound around to the outer peripheral side of the coil end 220 so that the connecting portions 211a and 212a are connected on the outer peripheral side, and the connecting portions 211a and 212a are bent to the inner peripheral side. Also good.

(Sixth connection structure)
FIG. 13 is a diagram for explaining a sixth connection structure in the present embodiment. First, as shown in FIG. 13A, the inner circumferential conductor terminal 212 is spirally wound along the coil end 220 in the direction of the conductor terminal 211 from the inner diameter side to the outer shape side. Then, the side surfaces of the connecting portions 211a and 212a are connected. At that time, the height of the connection portions 211a and 212a from the coil end 220 is increased to such an extent that the coil end coating is not affected by the heat at the time of connection.

  Next, as shown in FIG. 13B, the connecting portions 211 a and 212 a are folded down so as to be bent toward the inner peripheral side, and are brought into close contact with the coil end 220. In the case of this connection structure, since the conductor terminal 212 is bent so as to be folded, the coil end height is increased by the dimension of the two conductor terminals 212, but when the connection portions 211a and 212a are kept standing as in the conventional case. Compared to the above, the coil end height can be reduced. Instead of the inner peripheral side conductor terminal 212, the outer peripheral side conductor terminal 211 may be wound around the inner peripheral side, and the connecting portions 211a and 212a may be bent toward the outer peripheral side.

  In the first to sixth connection structures described above, the conductor terminal 211 and the conductor terminal 212 are connected so as to straddle the coil end 220, and the connection portions 211 a and 212 a are connected to the inner peripheral side or outer peripheral side of the coil end 220, or the coil. Since it is bent along the end 220 and accommodated in an empty space, the height of the coil end 220 can be kept low.

(Seventh connection structure)
When the flat rectangular conductor used for the winding becomes thick, it becomes difficult to bend the conductor terminal 211 and the conductor terminal 212 at the time of connection freely, particularly with a small radius of curvature. For example, when the connection structure shown in FIG. 8 is to be adopted, it is difficult to bend the conductor terminal 211 three-dimensionally along the coil end between the conductor terminal 212 and the conductor terminals 211 and 212 are wide. It becomes difficult to face each other. Further, if the conductor terminal 211 is bent so that the wide surfaces of the conductor terminals 211 and 212 face each other, the space for bending becomes large, and on the contrary, the space for the coil end becomes large.

  Therefore, in the seventh connection structure, the conductor terminal 212 that is bent in the radial direction so that the conductor terminal 211 does not need to be complicated in a three-dimensional manner (the surface corresponding to the long side of the rectangular cross section) and the conductor The terminal 211 is connected to the narrow side surface (the surface corresponding to the short side of the rectangular cross section). First, as shown in FIG. 14A, the conductor terminal 211 on the outer peripheral side is spirally wound along the coil end 220 as much as possible, and the terminal connection portion 211a of the conductor terminal 211 is connected to the conductor terminal 212 on the inner peripheral side. Crawling to the position. At this time, the terminal connection portion 211 a of the conductor terminal 211 is wound so that the height is substantially the same as the upper end surface of the coil end 220.

  Next, the terminal connection portion 211a of the conductor terminal 211 wound around the outer periphery of the coil end 220 is bent substantially perpendicularly to the outer periphery of the coil end 220, that is, radially outward. At this time, the terminal connecting portion 211a is bent so that the side surface is horizontal. Next, as shown in FIG. 14B, the inner circumferential conductor terminal 212 is bent in the circumferential direction along the upper end of the coil end 220 to bring the terminal connection portion 212a close to the terminal connection portion 211a. As a result, the wide surface of the terminal connection portion 212a is in contact with the side surface of the terminal connection portion 211a, and the cross-sectional shape in the contact state is a T-shape. Thereafter, the terminal connecting portions 211a and 212a are connected to each other by TIG welding or the like while maintaining the T shape using a jig or the like.

  As described above, the terminal connection portion 211a of the terminal connection portion 211a on the outer peripheral side has a simple connection structure that is bent outward with respect to the wide portion, so that even when a very thick electric wire (flat conductor) is used, the terminal connection portion 211a can be bent. It is easy to process and the space for bending is not enlarged. Therefore, the connecting portion can be stored in the empty space of the core back without protruding from the stator core 412. In addition, the coil end height is obtained by adding approximately one width of the conductor terminal 212 to the height of the coil end 220 before connection, and the coil end height can be kept low.

  In the example shown in FIG. 14, the outer conductor terminal 211 is spirally wound in the direction of the conductor terminal 212, and the conductor terminal 212 is bent and connected to the outside of the coil end 220. The outer conductor terminal 211 may be bent inward and connected after being wound in a spiral.

  FIG. 15 is a diagram showing a modification of the connection structure shown in FIG. In the example shown in FIG. 14, the conductor terminal 212 on the inner peripheral side is radially bent in the radial direction, but in the modification shown in FIG. 15, the connection is made by bending in an oblique direction with respect to the radial direction. By tilting in this way, it is possible to reduce the protruding amount of the connecting portion in the outer diameter direction from the peripheral surface of the coil end 220. Further, in the case of the same protrusion amount as in FIG. 14, the length of the connecting portion can be made longer, and the connection can be performed more reliably.

(Eighth connection structure)
FIG. 16 is a diagram for explaining an eighth connection structure in the present embodiment. In the eighth connection structure, the notch 211c is formed in the terminal connection portion 211a of the conductor terminal 211 wound in a spiral shape along the coil end 220. When connecting the terminal connection portions 211 a and 212 a, first, as shown in FIG. 16A, the outer peripheral side conductor terminal 211 is spirally wound along the coil end 220.

  As described above, the notch 211c is provided on the short side of the conductor terminal 211 in advance. The width and depth of the notch 211c are adjusted according to the width and thickness of the conductor terminal 212 on the inner peripheral side. When the conductor terminal 211 is spirally wound, the conductor terminal 211 is wound so that the position of the notch 211c faces the inner circumferential conductor terminal 212 as shown in FIG.

  Next, the conductor terminal 212 is bent radially outward along the upper end of the coil end 220 and engaged so that the terminal connection part 212a enters the notch 211c of the terminal connection part 211a, thereby performing positioning. Thereafter, as shown in FIG. 16B, the terminal connecting portions 211a and 212a are connected to each other by TIG welding or the like.

  Also in the eighth connection structure, the coil end height is obtained by adding approximately one width of the conductor terminal 212 to the height of the coil end 220 before connection, and the coil end height can be kept low. Furthermore, by providing the notch 211c in this way, the conductor terminals can be easily positioned with each other, and the positioning mechanism of the manufacturing apparatus can be omitted. Moreover, the protrusion amount of the connecting portion in the outer diameter direction from the peripheral surface of the coil end 220 can be reduced.

  FIG. 17 is a diagram illustrating a modified example of the eighth connection structure. FIG. 17A shows a first modification, and is a case where the notch 211c is formed on the lower side surface of the terminal connection portion 211a. Also in this case, positioning can be performed reliably and welding work is facilitated, but the height of the connecting portion is increased by the dimension h shown in FIG. In the second modification shown in FIG. 17B, a through hole 211d is formed in the terminal connection portion 211a instead of the notch 211c, and the terminal connection portion 212a is inserted into the through hole 211d.

  In contrast to the case shown in FIG. 16, a notch or a through hole may be formed on the conductor terminal 212 side, and the conductor terminal 211 on the outer peripheral side may be bent to the inner peripheral side. Further, in the above-described embodiment, as described with reference to a conductor having a rectangular cross-sectional shape as shown in FIG. 16A, the description has been given with a rectangular notch 211c and a through-hole shape 211d corresponding to the cross-sectional shape. You may comprise notches, such as a trapezoid, a triangle, a part of a circle, and a part of an ellipse, according to conductor cross-sectional shape.

  In addition, the rotary electric machine in embodiment mentioned above can also be deform | transformed as follows. (1) In the embodiment described above, an induction rotating electrical machine having an eight-pole configuration has been described as an example. However, the present invention can also be applied to a stator winding such as a permanent magnet type rotating machine. (2) The present invention can also be applied to a stator winding of a generator. (3) The shape of the conductor used for the winding is not limited to the rectangular cross-sectional shape, and can also be applied to the case where a circular round wire is used. (4) In the above-described embodiment, the method of performing lap winding by distributed winding is described as an example of the winding method of the stator winding. However, the conductor terminals to be connected are the inner peripheral side and the outer peripheral side of the coil end 220. For example, the present invention can be similarly applied to a wave winding type winding.

  Note that the present invention is not limited to the above embodiment as long as the characteristics of the present invention are not impaired.

  4: stator, 5: rotor, 211, 212: conductor terminal, 211a, 212a: connection part, 211b, 212b: scooping part, 220: coil end, 411: slot, 412: stator core, 413: fixed Child coil, 4131a, 4131b, U11 to U24, V11 to V24, W11 to W24: Coil, 211c: Notch, 211d: Through hole

The present invention relates to a rotating electrical machine such as a motor and a generator , a stator used for the rotating electrical machine, and a stator winding.

  A stator winding according to a first aspect of the present invention is a stator winding used in a rotating electrical machine configured by connecting a plurality of coils arranged in a slot of a stator core, and two stator windings connected to each other. One of the coils has a distal end coil terminal that is drawn in the coil end direction on the distal end side of the slot, and the other of the two coils is drawn in the coil end direction on the bottom side of the slot, It has a bottom coil terminal to be connected, and either one of the tip coil terminal or the bottom coil terminal is wound around the coil end to the other coil terminal side and connected to the other coil terminal. The tip side coil terminal and the bottom side coil terminal are bent so as to extend to one side in the radial direction of the coil end.
  According to a second aspect of the present invention, in the stator winding according to the first aspect, the distal end of the connection portion between the tip side coil terminal and the bottom side coil terminal faces one side in the radial direction.
  According to a third aspect of the present invention, in the stator winding according to the second aspect, when the distal end side coil terminal is wound around the other coil end side, the connection between the distal end side coil terminal and the bottom side coil terminal is performed. When the part is bent radially inward and the bottom coil terminal is wound around the other coil terminal, the connecting part between the tip coil terminal and the bottom coil terminal is bent radially outward. It is done.
According to a fourth aspect of the present invention, in the stator winding according to the second aspect, the connecting portion between the tip side coil terminal and the bottom side coil terminal is bent so as to overlap the coiled coil terminal.
  According to a fifth aspect of the present invention, in the stator winding according to the second aspect, the distal end of the connecting portion between the tip side coil terminal and the bottom side coil terminal faces the radially outer peripheral side of the coil end.
  According to a sixth aspect of the present invention, in the stator winding according to the fifth aspect, the tip of the connecting portion is located on the outer periphery in the radial direction of the coil end.
  A stator of a rotating electrical machine according to a seventh aspect of the invention includes the stator winding according to any one of the first to sixth aspects.
  A rotating electrical machine according to an eighth aspect of the invention includes the stator according to the seventh aspect.

Claims (17)

A stator having a stator core formed with a plurality of slots, and a stator winding formed by connecting a plurality of coils held in the slots;
A rotor having a surface facing the stator core and rotatably held through a gap, and magnetic flux is applied to the stator core and the rotor on the faces facing each other through the gap. A rotating electrical machine that produces a magnetic circuit to send and receive,
The two coils of the stator winding connected to each other have a distal end side coil terminal, one of which is drawn in the coil end direction of the stator winding on the distal end side of the slot. The other has a bottom coil terminal that is drawn out in the coil end direction of the stator winding on the bottom side of the slot and connected to the tip coil terminal,
The tip side coil terminal is wound around the coil end side along the coil end, and connected to the bottom side coil terminal,
A rotating electrical machine in which a distal end of a connection portion between the distal end side coil terminal and the bottom side coil terminal faces a radially outer peripheral side. A stator having a stator winding formed by connecting a plurality of coils to a plurality of slots formed in the stator core; and
A rotor provided rotatably inside the stator,
The two coils connected to each other of the stator winding include a first coil having a distal end side coil terminal drawn in a coil end direction of the stator winding on the distal end side of the slot, and a bottom of the slot A second coil having a bottom side coil end that is pulled out in the coil end direction of the stator winding on the side and connected to the tip side coil end;
Either one of the tip side coil terminal or the bottom side coil terminal is pulled out to the other coil terminal side through a gap between windings of the coil end, and the drawn coil terminal is connected to the other coil terminal Rotating electric machine having a coil terminal connection structure. The rotating electrical machine according to claim 2,
When the distal end coil terminal is pulled out to the other coil terminal side, the connecting portion between the distal end coil terminal and the bottom coil terminal is bent toward the inner peripheral side of the stator core,
A rotating electrical machine that bends a connection portion between the distal end side coil terminal and the bottom side coil terminal to the outer peripheral side of the stator core when the bottom side coil terminal is pulled out to the other coil end side. A stator having a stator core formed with a plurality of slots, and a stator winding formed by connecting a plurality of coils held in the slots;
A rotor having a surface facing the stator core and rotatably held through a gap, and magnetic flux is applied to the stator core and the rotor on the faces facing each other through the gap. A rotating electrical machine that produces a magnetic circuit to send and receive,
The two coils of the stator winding connected to each other have a distal end side coil terminal, one of which is drawn in the coil end direction of the stator winding on the distal end side of the slot. The other has a bottom coil terminal that is drawn out in the coil end direction of the stator winding on the bottom side of the slot and connected to the tip coil terminal,
Either one of the tip side coil terminal and the bottom side coil terminal is wound around the other coil terminal side along the coil end, and connected to the other coil terminal,
When the tip coil terminal is wound around the other coil terminal, the connecting portion between the tip coil terminal and the bottom coil terminal is bent to the inner peripheral side of the stator core,
A rotating electrical machine that bends a connection portion between the distal end side coil terminal and the bottom side coil terminal to the outer peripheral side of the stator core when the bottom side coil terminal is wound around the other coil end side. A stator having a stator core formed with a plurality of slots, and a stator winding formed by connecting a plurality of coils held in the slots;
A rotor having a surface facing the stator core and rotatably held through a gap, and magnetic flux is applied to the stator core and the rotor on the faces facing each other through the gap. A rotating electrical machine that produces a magnetic circuit to send and receive,
The two coils of the stator winding connected to each other have a distal end side coil terminal, one of which is drawn in the coil end direction of the stator winding on the distal end side of the slot. The other has a bottom coil terminal that is drawn out in the coil end direction of the stator winding on the bottom side of the slot and connected to the tip coil terminal,
Either one of the tip side coil terminal and the bottom side coil terminal is wound around the other coil terminal side along the coil end, and connected to the other coil terminal,
A rotating electrical machine in which a connection portion between the distal end side coil terminal and the bottom side coil terminal is bent in a circumferential direction of the coil end. A stator having a stator core formed with a plurality of slots, and a stator winding formed by connecting a plurality of coils held in the slots;
A rotor having a surface facing the stator core and rotatably held through a gap, and magnetic flux is applied to the stator core and the rotor on the faces facing each other through the gap. A rotating electrical machine that produces a magnetic circuit to send and receive,
The two coils of the stator winding connected to each other have a distal end side coil terminal, one of which is drawn in the coil end direction of the stator winding on the distal end side of the slot. The other has a bottom coil terminal that is drawn out in the coil end direction of the stator winding on the bottom side of the slot and connected to the tip coil terminal,
Either one of the tip side coil terminal and the bottom side coil terminal is wound around the other coil terminal side along the coil end, and connected to the other coil terminal,
A rotating electrical machine in which a connection portion between the tip side coil terminal and the bottom side coil terminal is bent so as to overlap the coiled coil terminal. In the rotating electrical machine according to claim 1,
A rotating electrical machine in which the connecting portion is disposed on the radially outer side from the coil end. The rotating electrical machine according to claim 7,
A rotating electrical machine in which the connecting portion is disposed at a position a predetermined distance from the coil end. The rotating electrical machine according to claim 8,
For the coil, a conductor having a rectangular cross section composed of a long side and a short side is used,
The rotating electrical machine in which the connecting portion is configured such that a long-side surface of the tip-side coil terminal and a long-side surface of the bottom-side coil terminal face each other. The rotating electrical machine according to claim 8,
For the coil, a conductor having a rectangular cross section composed of a long side and a short side is used,
The rotating electrical machine in which the connecting portion is configured such that a short-side surface of the tip-side coil terminal faces a short-side surface of the bottom-side coil terminal. The rotating electrical machine according to claim 9,
The rotating electrical machine in which the connecting portion is configured such that the tip coil terminal and the bottom coil terminal overlap in the axial direction. A stator winding used in a rotating electric machine configured by connecting a plurality of coils arranged in a slot of a stator core,
Two coils connected to each other have a distal end side coil terminal that is drawn out in the coil end direction on the distal end side of the slot, and the other of the two coils is in the coil end direction on the bottom side of the slot. Having a bottom side coil terminal connected to the tip side coil terminal to be pulled out;
The distal end side coil terminal and the bottom side coil terminal are bent to the radially outer peripheral side of the coil end,
The distal end side coil terminal is wound around the coil end toward the bottom side coil terminal and connected to the bottom side coil terminal;
The stator winding | coil which the front-end | tip of the connection part of the said front end side coil terminal and the said bottom side coil terminal has faced the radial direction outer peripheral side. The stator winding according to claim 12,
A stator winding in which the connecting portion is disposed on the radially outer side from the coil end. The stator winding according to claim 13, wherein
A stator winding in which the connecting portion is disposed at a certain distance from the coil end. The stator winding according to claim 14, wherein
For the coil, a conductor having a rectangular cross section composed of a long side and a short side is used,
The stator winding in which the connecting portion is configured such that a long side surface of the tip side coil terminal faces a long side surface of the bottom side coil terminal. The stator winding according to claim 14, wherein
For the coil, a conductor having a rectangular cross section composed of a long side and a short side is used,
The stator winding in which the connecting portion is configured such that the short-side surface of the tip-side coil terminal faces the short-side surface of the bottom-side coil terminal. The stator winding according to claim 15,
The stator winding in which the connecting portion is configured such that the tip coil terminal and the bottom coil terminal overlap in the axial direction.

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