JP3864878B2 - High voltage rotating electrical machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high voltage rotating electrical machine.
[0002]
[Prior art]
A rotating electrical machine for an automobile has a shape in which a stator winding is accommodated in a slot formed in an annular stator core, and a part of the stator winding protrudes from the stator core to the outside in the axial direction, that is, to a coil end portion. .
[0003]
In recent years, there has been a demand for downsizing and high output of rotating electrical machines including coil ends because of the requirement to enable mounting without changing the volume in the engine room. In order to meet this need, when trying to reduce the coil end length, it is necessary to make the distance between adjacent conductors as small as possible, resulting in a very high voltage difference between the conductors, causing a problem with insulation. .
[0004]
Specifically, in order to meet this need, it is an effective means to improve the space factor of the winding, and the stator winding of the conventional rotating electric machine is a conductor having a rectangular cross section ( A technique using a flat wire is employed (see, for example, Patent Document 1). However, in this configuration, the conductors in the slots have the same phase and the slots adjacent in the circumferential direction have different phases. Increasing the number of turns, that is, the number of conductors in one slot, in order to cope with higher voltage, in other words, to increase the output of the rotating electrical machine, increases the number of conductors overlapping at the coil end portion, and is compatible with high voltage. When it did, there was a problem of insulation between adjacent conductors. For this reason, when the distance between the conductors is increased, there is a problem that the axial size of the rotating electrical machine is increased.
[0005]
Further, in order to avoid the above problem, the conventional rotating electric machine provides means for increasing the number of turns by arranging the conductors constituting a specific phase to be accommodated in a plurality of slots adjacent in the circumferential direction. (For example, refer to Patent Document 2). In this way, it is possible to increase the number of turns without increasing the number of poles of the rotor while keeping the outer diameter small by suppressing the number of conductors in one slot. Moreover, since it is not necessary to increase the number of poles of the stator, the frequency of the stator coil voltage can be reduced at the same rotational speed, and by reducing the wiring inductance loss and the inverter switching loss (switching transient loss), Efficiency improvement can be realized. Therefore, it is possible to reduce the cost and loss of the inverter and wiring and reduce heat generation.
[0006]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-92766 (5th page, FIG. 2, FIG. 3)
[Patent Document 2]
JP 2002-228852 A (5th page, FIG. 2)
[0007]
[Problems to be solved by the invention]
However, if this rotating electric machine is to cope with higher voltage, the configuration of Japanese Patent Laid-Open No. 2002-228852 can further increase the number of conductors and reduce the coil ends, so that the distance between adjacent conductors is made as small as possible. Therefore, a very high voltage difference occurs between the conductors, and there is a problem in insulation.
[0008]
The present invention has been made in view of the above problems, and in order to cope with a higher voltage without increasing the number of poles of the stator, the number of turns is increased, and further, the distance between adjacent conductors of the rotating electrical machine is reduced. However, an object of the present invention is to provide a high-voltage rotating electrical machine that can maintain insulation.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, since the U-phase, V-phase, and W-phase slot groups are sequentially formed in the circumferential direction, the physique in the radial direction is kept small by suppressing the number of conductors in one slot. However, the number of turns can be increased, and the rotating electrical machine can be driven with a high voltage system without increasing the number of poles of the rotor, and the cost and loss of the inverter and wiring can be reduced, and heat generation can be reduced. Can do.
[0010]
A plurality of partial coils constituting each phase slot group of the U phase, V phase, and W phase, that is, the outer conductor portions of the slots of the Un, Vn, and Wn partial coils are respectively provided in a regular order in the circumferential direction. Since the Un, Vn, and Wn in-slot conductor portions are connected to each other, the outside-slot conductor portions can be regularly arranged in the stator core core axial direction.
[0011]
Further, among the plurality of partial coils forming each phase coil, the in-slot conductors of the U1 partial coil, the V1 partial coil, and the W1 partial coil, which are input / output terminal connecting partial coils, are circumferential ends of each phase slot group. Since it is disposed in a slot other than the position, the conductor portion outside the slot connected to the slot can reduce the potential difference from the conductor portion outside the slot of the adjacent phase coil, and the insulation performance can be improved.
[0012]
In this specification, the slot refers to a conductor accommodating space having a size for accommodating one conductor of the stator winding, and is formed in the stator core axial direction with a size for accommodating one conductor in the circumferential direction. It may be a hole. Further, the present invention is not limited to this, and even a space having a size for accommodating one conductor in the circumferential direction among holes having a width extending in the circumferential direction so as to accommodate a plurality of conductors adjacent to each other in the circumferential direction. Good. In this case, one hole formed in the stator core forms a plurality of slots in the circumferential direction.
[0013]
According to the second aspect of the present invention, since the in-slot conductor portion of the partial coil connected to the neutral point is disposed in the circumferential end slot of each of the phase slot groups, the outside-slot conductor portion continuous therewith Can reduce the potential difference between the conductors outside the slots of the adjacent phase coils and improve the insulation performance.
[0014]
According to the third aspect of the present invention, the head portion, the pair of in-slot conductor portions, and the pair of protruding end portions extending in the substantially circumferential direction form a U-shaped segment, and are easy to handle, and the stator core It is easy to be accommodated in the slot, and a plurality of U-shaped segments are inserted in the slot in the axial direction to join the protruding end portions, so that workability is good. Moreover, even if the stator core is composed of a large number of U-shaped segments, the in-slot conductors are accommodated in the slots at the same positions in the circumferential direction within the group of slots of the same phase, so that the joints are regularly arranged in the circumferential direction. The space factor of the windings can be easily improved.
[0015]
According to the fourth aspect, it is possible to reduce the potential difference between the adjacent conductors outside the slot in the slot group of the same phase, and to improve the insulation performance.
[0016]
According to the fifth aspect, the potential difference between the slot outer conductor portions of the partial coil positioned at the end of the slot group and the partial coil of the slot group adjacent thereto can be reduced, and the outside of the adjacent slot in the slot group of the same phase can be reduced. The potential difference between the conductor portions can be reduced, and the insulation performance can be improved.
[0017]
According to the sixth aspect, it is possible to increase the distance when the outside-slot conductor portions between the partial coil groups are adjacent to each other, and the insulation performance can be improved.
[0018]
According to the seventh aspect, a large number of segments can be inserted into the slot, and the coil groups can be regularly arranged by being parallel in the radial direction, and the coil end length can be reduced. Further, if the parallel coils are connected in series, the conductor cross-sectional area can be increased while reducing the current density by connecting in parallel, and it becomes easy to achieve a high current and high output specification. In addition, it is possible to use a segment with good productivity.
[0019]
According to the eighth aspect of the present invention, each phase slot group of the first phase and the second phase is composed of the first n slot and the second n slot sequentially formed in the circumferential direction. The number of turns can be increased while maintaining a small size, and the rotating electrical machine can be driven with a high voltage system without increasing the number of poles of the rotor, reducing the cost and loss of the inverter and wiring, and reducing heat generation Can be realized.
[0020]
In addition, since the outer conductor portions of the slots of the first ns and second ns coils are connected to the inner conductor portions of the first n and second n slots provided in a regular order in the circumferential direction, the outer conductor portions of the slots are regularly arranged. It can arrange | position in a stator core core axial direction.
[0021]
Further, among the plurality of partial coils forming each phase coil, the in-slot conductors of the eleventh partial coil and the twenty-first partial coil, which are input / output terminal connecting partial coils, are other than the circumferential end positions in each phase slot group. Therefore, the potential difference between the adjacent slot outer conductor portions of the adjacent phase coils can be reduced, and the insulation performance can be improved.
[0022]
In addition, this claim 7 shows the relationship in two phases of the rotating electric machine having a plurality of coils of two or more phases.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a segment sequential stator coil type high-voltage vehicular rotating electrical machine to which the present invention is applied will be described below with reference to examples.
[0024]
(First embodiment)
(Description of overall configuration)
In FIG. 1, a segment sequential stator coil type rotating electrical machine 1 includes a rotor 2 as a rotor, an annular stator 3 as a stator core, a housing 4, a rectifier 5 as a three-phase input / output terminal, and an output extraction terminal 6. , A known vehicular AC generator having a rotating shaft 7, a brush 8, and a slip ring 9. The stator 3 includes a stator coil 31 and a stator core 32 as stator windings. The stator core 32 is fixed to the inner peripheral surface of the peripheral wall of the housing 4, and the stator coil 31 is wound around each slot of the stator core 32. The rotor 2 is a Landel pole type rotor fixed to the rotating shaft 7 rotatably supported by the housing 4. The rotor 2 is arranged on the inner side of the stator core 32, and constitutes the number of pole pairs 4 alternately along the rotation circumferential direction. A pole core 73 and an electromagnetic coil 72 are fixed to the rotor core 71.
[0025]
The stator coil 31 that is a stator winding is a three-phase armature winding, and is connected to the rectifier 5 for each phase, and forms a three-phase star connection (hereinafter also referred to as a star connection). In this embodiment, the rectifier 5 functions as an output terminal when used as a generator.
[0026]
Further, as shown in FIG. 3, the segment set 330 shown in FIG. 2 is inserted into the slot 350, which is a large number of slots formed so as to penetrate the stator core 32 in the axial direction and extend in the radial direction. The distal ends adjacent to each other in the radial direction are sequentially connected on the other side in the axial direction. The stator coil 31 has an end side coil end 311 on the other side in the axial direction and a head side coil end 312 on the one side in the axial direction. Such a segmented sequential stator coil itself is no longer known. In the present invention, the input / output terminal means an input terminal when the rotating electrical machine is used as a motor, and functions as an output terminal when used as a generator. It does not mean that it has a function.
[0027]
(Description of segment set 330)
The segment set 330 will be described in more detail with reference to FIG.
[0028]
The segment set 330 includes a substantially U-shaped head, a pair of slot conductors linearly extending from both ends of the head and housed in the slot, and a pair of protrusions extending from the ends of both slot conductors. It consists of two flat U-shaped segments each having an end, that is, one large segment 331 and one small segment 332.
[0029]
Each head constitutes a head-side coil end 312 (see FIG. 1) that exists in a U-shape as a whole on one side in the axial direction of the stator core 32, and each protruding end is on the other side in the axial direction of the stator core 32. An end side coil end 311 (see FIG. 1) that exists in a ring shape as a whole is configured.
[0030]
The segment set 330 has a large large segment 331 and a small small segment 332. The large segment 331 and the small segment 332 surrounded by the large segment 331 are referred to as a segment set.
[0031]
The large segment 331 is a wave winding segment, 331a and 331b are in-slot conductor portions, 331c is a head portion connected to the slot conductor portion, and 331f and 331g are protruding end portions connected to the slot conductor portion. The leading end portions 331d and 331e of the protruding end portions 331f and 331g are also referred to as joint portions because they are joint portions with other segments. The slot conductor portion 331a is referred to as a one-layer slot conductor portion, and the slot conductor portion 331b is referred to as a four-layer slot conductor portion.
[0032]
The small segment 332 is a lap winding segment, 332a and 332b are in-slot conductor portions, 332c is a head portion, 332f and 332g are protruding end portions. Since the leading end portions 332d and 332e of the protruding end portions 332f and 332g are joint portions, they are also referred to as joint portions. The slot conductor portion 332a is referred to as a two-layer slot conductor portion, and the slot conductor portion 332b is referred to as a three-layer slot conductor portion.
[0033]
The symbol 'indicates the same portion as the portion without the large segment or small segment symbol' (not shown). Accordingly, in FIG. 2, the joint portion 331 d and the joint portion 332 d ′ that are adjacent to each other in the radial direction are welded, the joint portion 332 d and the joint portion 331 d ′ that are adjacent to each other in the radial direction are welded, and are adjacent to each other in the radial direction. The joint portion 332e and the joint portion 331e ′ are welded.
[0034]
In FIG. 2, when the one-layer slot conductor portion 331 a and the two-layer slot conductor portion 332 a are accommodated in one predetermined slot of the stator core 32, the four-layer slot conductor portions 331 b of the same segment set 331, 332 are used. The three-layer slot conductor portions 332b are accommodated in one slot that is separated from the predetermined slot by a predetermined pitch. The head 332c of the small segment 332 is disposed so as to be surrounded by the head 331c of the large segment 331.
[0035]
(Insert segment into slot 350)
A small segment 332 and a large segment 331 are respectively inserted in a slot 350 (to be described later) formed in the axial direction of the stator core 32 in the axial direction, and then protruded to the outside from the slot 350 of the stator core 32 331f. 332f, 331g, and 332g are joined to other protruding ends, respectively. This is repeated for each slot to form a winding coil that makes one turn around the stator core. In this embodiment, four winding coils are connected in series to form one partial coil.
[0036]
FIG. 7 is a diagram in which the small segment 332 and the large segment 331 are all inserted in the slot 350 of the stator core 32 in the axial direction, as viewed from the outside in the radial direction.
[0037]
In the stator core 32, a protruding end portion 331g1 extending in the upper part of the figure is connected to another protruding end portion by a joint portion 331e at the tip. Since the protruding end portions are continuous with the provided in-slot conductor portions 331b, the distance between the protruding end portion 331g1 and the protruding end portion 331g2 is small.
[0038]
(Segment set arrangement in the slot)
An arrangement state of the slot conductor portions in the slot 350 is shown in FIG. FIG. 3 is an enlarged view of a part of FIG.
[0039]
In the slot 350, four conductor accommodation positions are set in the radial direction, and the four conductor accommodation positions adjacent in the radial direction are referred to as a conductor accommodation position set, and one layer, two layers, It is called three layers and four layers.
[0040]
Four types of slot conductor portions of the segment set of the set described with reference to FIG. 2 are inserted into the first to fourth layers of conductor accommodation positions of these conductor accommodation position sets.
[0041]
More specifically, the slot conductor portions 331a, 332a, 332b ′, and 331b ′ are accommodated sequentially in the radial direction at the first to fourth conductor accommodation positions of each conductor accommodation position set. That is, the one-layer slot conductor portion 331a is counted from the inner side in the radial direction, the two-layer slot conductor portion 332a is located at the two-layer conductor accommodation position, and the three-layer slot conductor portion 332b ′ is three. The four-layer slot conductor portion 331b ′ is accommodated in the four-layer conductor accommodating position at the layer conductor accommodating position. In FIG. 3, the slot conductor portions 332a and 332b ′ belong to two small segments 332 separately, and the slot conductor portions 331a and 331b ′ also belong to two large segments 331 separately.
[0042]
In FIG. 3, a state in which the segment set 330 is accommodated in the slot 350 is shown, but the slot shown in FIG. 351, 352, 353... Are provided and filled with the respective slot conductors of the segment set.
[0043]
Four adjacent slots 350, 351, 352, and 353 including the slot 350 form a U-phase slot group, and a U-phase phase voltage that is the same phase is applied to a segment accommodated in the U-phase slot group.
[0044]
Here, slots (in this case, 350 to 353) in which in-phase phase windings are accommodated and adjacent to each other in the circumferential direction are referred to as in-phase slots, and the entire in-phase slots are referred to as an in-phase slot group. Further, the leftmost slot 350 of the group of in-phase slots is referred to as a first in-phase slot, and in the order to the right, the slot 351 is a second in-phase slot, the slot 352 is a third in-phase slot, and the slot 353 is a fourth in-phase slot. Also called. Each of the slots 350 to 353 has 1 to 4 layers of conductor accommodation positions.
[0045]
In this embodiment, each phase slot group is formed by a plurality of adjacent slots, so that the rotating electrical machine can be driven with a high voltage system without increasing the number of poles of the rotor, and the low cost of the inverter and wiring can be reduced. Reduction, loss and heat generation can be realized.
[0046]
Each phase slot group is formed in order in the order of W, V, U in the circumferential direction.
[0047]
The number of phases is 3, the number of pole pairs is 4, and each phase slot group is composed of 4 slots, so the number of slots is 96. In general, if the number of pole pairs is p, when the number of phases is 3 and the in-phase slot is composed of n slots, 6 np slots are formed.
[0048]
(Description of phase coil configuration)
In this embodiment, three phase windings of U, V, and W are star-connected as shown in FIG.
[0049]
In the U phase, the partial coils U1, U2, U3, and U4 are connected in series.
[0050]
The partial coil U1 is connected to the input / output terminal a, and the partial coil U4 is connected to the neutral point e.
[0051]
U1 and U2 are connected at connection point b, U2 and U3 are connected at connection point c, and U3 and U4 are connected at connection point d.
[0052]
Similarly for the V phase and the W phase, the partial coils V1, V2, V3, V4; W1, W2, W3, W4 are connected in series, the partial coils V1, W1 are connected to the input / output terminals, and the partial coil V4 , W4 are connected to the neutral point.
[0053]
Each partial coil is formed by connecting four rotating coils, that is, a first rotating coil, a second rotating coil, a third rotating coil, and a fourth rotating coil in series with a deformed wave winding segment (not shown).
[0054]
In each coil, U-shaped segments are alternately connected, and more specifically, a lap winding segment that is a small segment and a wave winding segment that is a large segment are alternately connected so as to make one round around the stator core. Have a shape to
[0055]
The wave winding segment referred to here is a large segment in which a pair of protruding end portions are bent in a direction away from each other, and has a slot conductor portion accommodated in a one-layer or four-layer conductor accommodation position.
[0056]
The overlapped segment mentioned here includes a small segment 332 bent in a direction in which a pair of protruding end portions approach each other, and has a slot conductor portion that is accommodated in a conductor accommodating position of two layers or three layers.
[0057]
(Explanation of the arrangement of each coil in each phase slot group)
FIG. 5 shows an exploded view of the U-phase winding of the star connection segment sequential joining stator coil 31 of this embodiment. It is natural that the phase windings of the other phases have the same structure only by shifting in the circumferential direction.
[0058]
In FIG. 5, slot numbers 1, 2, 3, 4, 13, 14, 15, 16, 25.26.27, 28, 37, 38, 39, 40 (12n + 1, 12n + 2, 12n + 3, 12n + 4). The expansion | deployment figure of the coil | winding by which the conductor part in a slot is inserted in this slot is shown.
[0059]
However, slot numbers 1, 13, 25, and 37 (12n + 1) are the first in-phase slot 350, slot numbers 2, 14, 26, and 38 (12n + 2) are the second in-phase slot 351,
Slot numbers 3, 15, 27 and 39 (12n + 3) designate the third in-phase slot 352,
Slot numbers 4, 16, 28, and 40 (12n + 4) designate the fourth in-phase slot 351.
Show.
[0060]
Four slot conductor portions adjacent in the radial direction that are accommodated in one slot are shown side by side in the left-right direction on the paper surface at the slot number position in FIG. For slot numbers 1 to 4, four in-slot conductors are shown for one slot number, and for slot numbers 13 to 16 and 85 to 88, only two in-slot conductors are shown for simplicity. ing.
[0061]
In this figure, the left and right positions of the four in-slot conductor portions in the slot at each slot number position do not correspond to the radial position in the slot. In this figure, the radial direction of the in-slot conductor portion The placement of is not shown.
[0062]
With reference to FIG. 5 in addition to FIG. 4, the positions of the connection points a to e of the partial coils will be described. A deformed segment having a different shape from the U-shaped segment extending from the slot of slot number 3 represents the connection point a between the partial coil U1 and the input / output terminal, and is different from the U-shaped segment extending from the slot of slot number 85. The irregularly shaped segment represents the connection point d between the partial coil U4 and the neutral point. Connection points b, connection points c, and connection points d representing the connection points of the partial coils U1 and U2, U2 and U3, and U3 and U4 are different from the U-shaped segments extending from the slots of slot numbers 87 and 2, respectively. A deformed segment having a shape different from a U-shaped segment extending from a slot having slot numbers 86 and 4 and a different shape having a different shape from a U-shaped segment extending from between the slots having slot numbers 88 and 1 Represented by segment.
[0063]
With reference to FIGS. 5, 6 (a) and 6 (b), the rotating coil of the U 3 partial coil, which is one of the partial coils, and the arrangement in the slot will be described in detail. Explanation is omitted for the same reason.
[0064]
In FIG. 6 (a), 25 slots (including a line of 90 degrees) are located in a range forming an angle of 90 degrees among 96 slots arranged in the circumferential direction of the outer circumferential position of the annular stator core 32. Only the slots (slot numbers 88-96, 1-16) and the heads of large segment 3312 and small segment 3322 are shown. In this embodiment, a U-phase slot group, a V-phase slot group, and a W-phase slot group each consisting of n = 4 slots are formed in the order of W phase, V phase, and U phase from the left. Each of the W-phase, V-phase, and U-phase slot groups forms a slot group, and four slot group groups are arranged on the entire circumference.
[0065]
Each U-phase slot group has U1, U2, U3, and U4 slots corresponding to U1, U2, U3, and U4 partial coils. For reasons described later, these are arranged in the order of U4 slot, U2 slot, U1 slot, and U3 slot from the left. The same applies to the V phase and the W phase.
[0066]
However, the U1 slot and the U-phase slot group named in this specification for the purpose of explanation of the relation with each partial coil and each phase coil are used for the actual stator core. It does not state that such symbols or identification marks must be attached. Of course, symbols and identification marks may be attached.
[0067]
The U3 partial coil is accommodated in the slots having slot numbers 4, slot numbers 16,..., 12n + 4 in FIG. For ease of understanding, only the heads of the large segment 3312 and the small segment 3322 accommodated in the slots of slot numbers 4 and 16 are shown in FIG. 6A. Moreover, in FIG.6 (b), a part is shown among the circulation coils which form a U3 partial coil.
[0068]
The U31 coil is composed of a large number of large segments 3311, 3313... And small segments 3320, 3322.
[0069]
In the large segment 3310, the in-slot conductor portion is accommodated in the fourth layer of slot number 76 and the first layer of 88 slots. The large segment 3311 is in the fourth layer of slot number 88 and the first layer of the fourth slot, the large segment 3312 is in the fourth layer of slot number 4 and the first layer of the 16 slot, and the large segment 3313 is In-slot conductors are accommodated in the fourth layer of slot number 16 and the first layer of 28 slots.
[0070]
On the other hand, in the small segment 3320, the in-slot conductor is accommodated in the third layer of slot number 76 and the second layer of 88 slots. The small segment 3321 is in the third layer of the slot number 88 slot and the second layer of the fourth slot, the small segment 3322 is in the third layer of the slot number 4 slot and the second layer of the sixteen slot, and the small segment 3323 is In-slot conductors are accommodated in the third layer of slot number 16 and the second layer of 28 slots.
[0071]
Both the large segment and the small segment, and a head having a U-shaped line shape protruding to one end of the stator core, connect the ends on one end of the pair of in-slot conductors. In addition, it is connected to the other end of the in-slot conductor portion, and includes a pair of protruding end portions that protrude to the other end side of the stator core and extend substantially in the circumferential direction. These head portions and protruding end portions form a slot outer conductor portion.
[0072]
The large segment is a wave winding segment, and the pair of protruding end portions are bent in the circumferential direction so as to be separated from each other, and connected to the protruding end portions of other small segments by, for example, welding.
[0073]
The small segment is a lap winding segment, and the pair of protruding end portions are bent in the circumferential direction so as to approach each other, and connected to the protruding end portions of the other large segments by, for example, welding.
[0074]
Furthermore, it demonstrates in detail with reference to FIG.6 (b). The U31 circuit coil is indicated by a white line, and the large segment 3311 constituting the U31 circuit coil has its one in-slot conductor portion (the left position in the figure) accommodated in the slot 88, and the protruding end connected to the large segment 3311 has the slot 76. And is connected to the protruding end of the small segment 3320 at a point p. Further, the other in-slot conductor portion (the right position in the figure) is accommodated in the slot 4, the protruding end portion connected to the slot 4 is bent in the direction of the slot 16, and is connected to the protruding end portion of the small segment 3322 at the point s.
[0075]
One of the small segments 3322 (the left position in the drawing) is accommodated in the slot 16 and the other (the right position in the drawing) is accommodated in the slot 4 and is connected at the head. It has been. One protruding end connected to the conductor portion in the slot (left position in the figure) is bent in the direction of the slot 16 and connected to the protruding end of the large segment 3313 at a point r.
[0076]
That is, from the connection point p to the connection point r, one large segment 3311 and one small segment 3322 are connected at the connection point s. The small segment 3322 is a lap winding segment formed around the slot 4 and the slot 16, and the large segment 3311 extends from an intermediate point between the slot 76 and the slot 88 to an intermediate point between the slot 4 and the slot 16. A plurality of these segment sets are successively consecutive in the circumferential direction, and the U31 circulating coil is formed by substantially one week in the circumferential direction. That is, in FIG. 6B, the U31 circuit coil is formed by connecting a large segment 3309, a small segment 3320, a large segment 3311, a small segment 3323, and a large segment 3313 in this order.
[0077]
On the other hand, the U32 circuit coil is shown in a pattern in which horizontal lines are arranged in FIG. 6B, and is connected by reversing the rotation direction at the end of the U31 circuit coil, that is, the lower diagram of FIG. 6B. Extending from the direction of the arrow on the right side, the protruding ends of the large segment 3314, small segment 3323, large segment 3312, small segment 3321, and large segment 3310 are connected in order at connection points u, t, w, and v. Has been.
[0078]
The small segment 3321 is a lap-wrapped segment formed in an annular shape around the slots 88 and 4, and the large segment 3312 extends from the midpoint between the slots 88 and 4 to the midpoint between the slots 16 and 28. A plurality of segment sets are successively arranged in the circumferential direction, and approximately one week in the circumferential direction is formed to form a U32 coil.
[0079]
As described above, the end portion of the U31 coil that has rotated the stator core substantially clockwise as described above is connected to the end portion of the U32 coil that has rotated the stator core approximately counterclockwise by an odd-shaped segment (not shown). The
[0080]
FIG. 5A shows the relationship between the partial coils U1, U2, U3, and U4 that are partial coils of the U-phase coil and the slot positions to be accommodated. That is, the slot conductor portion of the U1 partial coil connected to the input / output line is accommodated in the slot of slot number 3 which is the U1 slot, and the slot conductor portion of the U2 partial coil connected to the U1 partial coil is the slot which is the U2 slot. The slot conductor part of the U4 partial coil that is accommodated in the slot of slot number 4 that is accommodated in the slot of No. 2 and connected to the U2 partial coil is accommodated in the slot of slot number 4 that is the U4 slot. Is accommodated in the slot of slot number 1 which is a U4 slot.
[0081]
Further, FIG. 5A also shows that the V3 coil of the V phase coil is adjacent to the left side of the U phase coil, and the W4 coil of the W phase coil is adjacent to the right side of the U phase coil. .
[0082]
Only a part of the V3 and W4 partial coils are schematically shown, and the positional relationship indicates that the V3 partial coil is adjacent to the U4 partial coil and the W4 partial coil is adjacent to the U3 partial coil. .
[0083]
In FIG. 5 (a), four partial coils are displayed in an overlapped manner, so that a winding development view of only the U3 partial coil is shown in FIG. 5 (b) for easy understanding.
[0084]
In FIG. 5B, the thick solid line is a large segment constituting the U31 coil, the thick one-dot chain line is a small segment constituting the U31 coil, the thin solid line is a large segment constituting the U32 coil, and the thin one-dot chain line is a U32 coil. The small segment which comprises is shown. Details are the same as those described with reference to FIG.
[0085]
As described so far, the slot conductor portion of the U3 partial coil is accommodated in the same fourth in-phase slot (slot numbers 4, 16, 28,... 12n + 4) for both the U31 coil and the U32 coil.
[0086]
Further, the protruding end portion of the U31 circular coil and the protruding end portion of the U32 circular coil are alternately formed to extend between the in-slot conductor portions.
[0087]
(Second Embodiment)
The second embodiment is different from the first embodiment in the relationship between the lap winding and wave winding segments and the large and small segments, and the shape of accommodating the slot of the segment.
[0088]
The large segment is an overlapped segment, and a pair of protruding end portions are bent in the circumferential direction so as to approach each other, and connected to the protruding end portions of other small segments by, for example, welding.
[0089]
Further, the small segment is a wave winding segment, and the pair of protruding end portions are bent in the circumferential direction so as to be separated from each other, and connected to the protruding end portions of the other large segments by, for example, welding.
[0090]
Only the differences from the first embodiment will be described with reference to FIG. 10, and the others are omitted because they are the same as those of the first embodiment. FIG. 10 shows only a part of the circular coils forming the U3 partial coil.
[0091]
The U31 and U32 winding coils are composed of a large number of large segments 13310, 13311... And small segments 13320, 13321, 13322.
[0092]
In the large segment 13310, the in-slot conductor is accommodated in the first layer of slot number 76 and the fourth layer of 88 slots. The large segment 13311 is in the first layer of the slot number 88 slots and the fourth layer of the fourth slot, the large segment 13312 is in the first layer of the slot number 4 slots and the fourth layer of the sixteen slots, and the large segment 13313 is In-slot conductors are accommodated in the first layer of slot number 16 and the fourth layer of slot 28.
[0093]
On the other hand, in the small segment 13320, the in-slot conductor portion is accommodated in the second layer of slot number 76 and the third layer of 88 slots. The small segment 13321 is in the second layer of slot number 88 and the third layer of the fourth slot, the small segment 13322 is in the second layer of slot number 4 and the third layer of the 16 slot, and the small segment 13323 is In-slot conductors are accommodated in the second layer of slot number 16 and the third layer of 28 slots.
[0094]
Both the large segment and the small segment, and a head having a U-shaped line shape protruding to one end of the stator core, connect the ends on one end of the pair of in-slot conductors. In addition, it is connected to the other end of the in-slot conductor portion, and includes a pair of protruding end portions that protrude to the other end side of the stator core and extend substantially in the circumferential direction. These head portions and protruding end portions form a slot outer conductor portion.
[0095]
The large segment is an overlapped segment, and the pair of protruding end portions are bent in the circumferential direction so as to approach each other, and connected to the protruding end portions of other small segments by, for example, welding.
[0096]
Further, the small segment is a wave winding segment, and the pair of protruding end portions are bent in the circumferential direction so as to be separated from each other, and connected to the protruding end portions of the other large segments by, for example, welding.
[0097]
Further details will be described with reference to FIG. The U31 circuit coil is shown in a horizontal line pattern, and the large segment 13310 constituting the U31 circuit coil is accommodated in one of the slots (the right position in the figure) in the slot 88, and the protruding end connected to the large segment 13310 is the slot 76. Bent in the direction and connected to the protruding end of the small segment 13319 at a point p. Further, the other in-slot conductor portion (left position in the figure) is accommodated in the slot 76, and the protruding end portion connected to the slot 76 is bent in the direction of the slot 88 and connected to the protruding end portion of the small segment 13321 at the point q.
[0098]
In the small segment 13321, one in-slot conductor portion (the left position in the figure) is accommodated in the slot 88, and the other in-slot conductor portion (the right position in the figure) is accommodated in the slot 4, and they are connected at the head. It has been. The protruding end portion connected to the other conductor portion in the slot (the right position in the figure) is bent in the direction of the slot 16 and connected to the protruding end portion of the large segment 13312 at the point r.
[0099]
From the connection point p to the connection point r, one large segment 13310 and one small segment 13321 are connected at the connection point q. The large segment 13310 is a lap-wrapped segment formed in an annular shape around the slot 76 and the slot 88, and the small segment 13321 extends from the midpoint between the slot 76 and the slot 88 to the midpoint between the slot 4 and the slot 16. A plurality of these segment sets are successively consecutive in the circumferential direction, and the U31 circulating coil is formed by substantially one week in the circumferential direction. That is, in FIG. 10, the U31 circuit coil is formed by connecting a small segment 13319, a large segment 13310, a small segment 13321, a large segment 13312, and a small segment 13323 in this order.
[0100]
On the other hand, the U32 coil is shown in FIG. 10 as a pattern in which short solid lines are arranged, and the protruding end portions of the small segment 13318, the large segment 13313, the small segment 13322, the large segment 13311, and the small segment 13320 are connected. They are connected by points t, u, v, and w.
[0101]
The large segment 13313 is a lap winding segment formed around the slot 28 and the slot 16, and the small segment 13322 extends from an intermediate point between the slot 16 and the slot 28 to an intermediate point between the slot 88 and the slot 4. A plurality of segment sets are successively arranged in the circumferential direction, and approximately one week in the circumferential direction is formed to form a U32 coil.
[0102]
As described above, the end portion of the U31 coil that has rotated the stator core substantially clockwise as described above is connected to the end portion of the U32 coil that has rotated the stator core approximately counterclockwise by an odd-shaped segment (not shown). The
[0103]
What is important in the present invention is the arrangement of the in-phase group slot with the partial coil, and the in-slot conductor portion of the U1 partial coil which is the input / output terminal connecting partial coil has a potential difference with the other partial coils. Greater than. Therefore, it is slot 3 in the U-phase slot group (slot 1 to slot 4), and is arranged other than slots 1 and 4 at the circumferential end. Accordingly, the outer conductor portion of the slot connected to the in-slot conductor portion of the U1 partial coil has a larger distance between the outer conductor portions of the adjacent phase coils connected to V3 and W4, thereby reducing the potential difference and insulating performance. Can be improved.
[0104]
In addition, the slot conductor portion of the U4 partial coil connected to the neutral point has a smaller potential difference from the other phase coils than the other partial coils. Therefore, in the U-phase slot group (slot 1 to slot 4), it is accommodated in the slot at the circumferential end, that is, slot number 1 (in this embodiment, it is accommodated in slot number 1 but is accommodated in slot number 4). Also good). Accordingly, returning to FIG. 5 again, the potential difference between the outer conductor portion of the slot connected to the inner conductor portion of the U4 partial coil and the outer conductor portion of the slot connected to the inner conductor portion of the V3 partial coil of the V phase coil adjacent to the U phase is reduced. Insulation performance can be improved. Further, the in-slot conductor portion of the U1 partial coil and the slot conductor portion of the U4 partial coil are formed so as to sandwich another slot, specifically, the U2 slot therebetween. As a result, another partial coil slot having an intermediate potential can be sandwiched between the slot conductor portions of the U1 partial coil that is high voltage and the U4 partial coil that is low voltage, and the potential difference between the slot outer conductor portions in the same phase can be reduced. Can be reduced.
[0105]
In addition, since the U2 partial coil is connected to the U1 partial coil that is the input / output terminal connecting partial coil, the potential difference between the U2 partial coil and the other phase coil is larger than the other partial coil next to the U1 partial coil. Therefore, it is arranged in slot 2 between slot 1 and slot 3 in the U-phase slot group (slot 1 to slot 4). Therefore, the outer conductor portion of the slot connected to the inner conductor portion of the slot of the U3 partial coil can be increased in distance from the outer conductor portion of the adjacent phase coil so that the potential difference can be reduced and the insulation performance can be improved. it can.
[0106]
Further, since the U3 partial coil is connected to the U4 partial coil which is a neutral point connecting partial coil, the potential difference with the other phase coils is smaller than the other partial coils next to the U4 partial coil. Therefore, the U-phase slot group (slot 1 to slot 4) is accommodated in a slot at the end different from the U4 slot, that is, slot number 4. Therefore, the outer conductor portion of the slot connected to the inner conductor portion of the slot of the U3 partial coil can reduce the potential difference with the outer conductor portion of the slot connected to the inner conductor portion of the slot of the W4 partial coil of the adjacent phase coil. The performance can be improved.
[0107]
In this way, according to the present embodiment, the potential difference between the partial coil located at the end of the slot group and the outer conductor portion of the slot coil adjacent to the slot group can be reduced, and within the slot group of the same phase. Therefore, the potential difference between the adjacent conductors outside the slot can be reduced, and the insulation performance can be improved.
[0108]
According to the above-described embodiment, the head, the pair of in-slot conductor portions, and the pair of protruding end portions extending in the substantially circumferential direction form a U-shaped segment, and are easy to handle, and the stator core It is easy to be accommodated in the slot formed in the axial direction, and even if there are a large number of segments, the positions where the joint portions 331d, 331e, 332d, 332e of the protruding end portions 331f, 331g, 332f, 332g are shifted from each other The joint workability from the axial direction of the stator core is good. Moreover, even if the stator core is composed of a large number of U-shaped segments, the in-slot conductors are accommodated in the slots at the same positions in the circumferential direction within the group of slots of the same phase, so that the joints are regularly arranged in the circumferential direction. The space factor of the windings can be easily improved.
[0109]
(Third embodiment)
In the third embodiment, the winding specifications of each phase are different from those of the first embodiment, and the angle of the coil with respect to the stator core is changed accordingly.
[0110]
Other parts are the same as those of the first embodiment, and the description thereof is omitted.
[0111]
The three phase windings U, V, and W in the third embodiment are star-connected as shown in FIG.
[0112]
In the U phase, U1, U2, U3, U4 partial coils are connected in series to form a UA partial coil group 101. Similarly, U1 ', U2', U3'U4 'partial coils are connected in series. Thus, the UB partial coil group 102 is formed, and the partial coils U1 ″, U2 ″, U3 ″, and U4 ″ are connected in series to form the UC partial coil group 103.
[0113]
Furthermore, U1, U1 ′, U1 ″ partial coils are connected in parallel. Similarly, U2, U2 ′, U2 ″ partial coils, U3, U3 ′, U3 ″ partial coils, U4, U4 The partial coils of ', U4 "are also connected in parallel.
[0114]
The V phase and the W phase are the same as the U phase, and a description thereof is omitted.
[0115]
In the third embodiment, the slots of the fixed iron core in FIG. 11 are formed so that twelve conductors in the slot are accommodated in the radial direction.
[0116]
The UA partial coil group 101 is accommodated in the innermost peripheral four layers of the slot.
[0117]
Since the relationship between the UA partial coil group 101 of the third embodiment and the four layers of slots in which it is accommodated is the same as that of the first embodiment, description thereof is omitted. Among the slots, the UB partial coil group 102 and the UC partial coil group 103 are accommodated in the remaining eight layers of conductor accommodating positions where the UA partial coil group 101 is accommodated. That is, the UB partial coil group 102 is accommodated at the outer peripheral position of the UA partial coil group 101, and the UC partial coil group 103 is accommodated at the outer peripheral position of the UB partial coil group 102, that is, the outermost periphery.
[0118]
FIG. 8 is an exploded view of the U-phase winding, and simply shows the radial position of the slot accommodated in each slot group. That is, in FIG. 8, a winding development view of the UC partial coil group 103 which is the outer layer, the UB partial coil group 102 which is the middle layer, and the UA partial coil group 101 which is the inner layer is illustrated in order from the top. The partial coils U1 ″, U2 ″, U3 ″, U4 ″ are accommodated in the outermost four layers of the slot, and the partial coils U1 ′, U2 ′, U3′U4 ′ of the middle layer UB partial coil group 102 are the center of the slot. The partial coils U1, U2, U3, U4 of the UA partial coil group 101 that is housed in the four layers of the innermost layer are also housed in the four innermost layers of the slot.
[0119]
Further, the partial coils of the UA, UB, and UC partial coil groups are in the order of U4, U2, U1, U3; U4 ', U2', U1 ', U3'; U4 ", U2", U1 ", U3". Housed inside. Since the concept is the same as that of the first embodiment, the description is omitted.
[0120]
In FIG. 8, points A, B, and C represent points where the U4 coil, U4 ′ coil, and U4 ″ coil are connected,
Points D, E, and F represent points connecting the U2 partial coil, the U2 ′ partial coil, and the U2 ″ partial coil,
Points G, H, and I represent points connecting the U1 partial coil, U1 ′ partial coil, and U1 ″ partial coil,
Points J, K, and L represent points where the U3 partial coil, U3 ′ partial coil, and U3 ″ partial coil are connected.
[0121]
In this way, the U1 partial coil of the UA partial coil group 101, the U1 ′ partial coil of the UB partial coil group 102, and the U1 ″ partial coil of the UC partial coil group 103 are connected in parallel. U2 partial coil, U2 'partial coil of UB partial coil group 102, U2 "partial coil of UA partial coil group 101 are connected in parallel, U3 partial coil of UA partial coil group 101, U3' of UB partial coil group 102 The partial coil and the U3 ″ partial coil of the UA partial coil group 101 are connected in parallel.
[0122]
As a result, regular connection is possible, and it is possible to avoid an unusually complicated shape for the deformed segment for connection.
[0123]
Furthermore, as shown in FIG. 12, the UC partial coil group 103 accommodated in the outermost peripheral position includes the inner UB partial coil group 102 and the innermost peripheral UA partial coil group 101 in the axial direction of the stator core. Is significantly inclined in the outer diameter direction. Therefore, the distance when the outside-slot conductor portions between the partial coil groups are adjacent to each other can be increased, and the insulation performance can be improved. In this way, it is effective to obtain a rotating electrical machine corresponding to a higher output.
[Brief description of the drawings]
FIG. 1 is an axial sectional view of a rotating electrical machine for a vehicle according to a first embodiment.
FIG. 2 is a perspective view of a segment set according to the first embodiment.
FIG. 3 is a conductor layout diagram in the slot according to the first embodiment;
FIG. 4 is a connection diagram of a phase winding according to the first embodiment.
FIG. 5A is a development view of a U-phase winding according to the first embodiment.
FIG. 5B is a development view of a U3-phase winding of the first embodiment.
FIG. 6A is a layout view of each partial coil in the slot according to the first embodiment.
FIG. 6B is a diagram illustrating connection of each segment of the U31 circulating coil and the U32 rotating coil according to the first embodiment.
FIG. 7 is a partial view of the stator core according to the first embodiment.
FIG. 8 is a connection diagram of a phase winding according to a third embodiment.
FIG. 9 is an exploded view of the three-phase winding of the third embodiment.
FIG. 10 is a diagram illustrating connection of each segment of a U31 circular coil and a U32 circular coil according to the second embodiment.
FIG. 11 is a partial cross-sectional view showing the shape of a coil according to a third embodiment.
FIG. 12 is a partial cross-sectional view showing the shape of a coil according to a third embodiment.
[Explanation of symbols]
1 Rotating electrical machinery for high-voltage vehicles
2 Rotor
31 Stator winding
32 Stator core
331a, 331b, 332a, 332b In-slot conductor
331c, 331d, 331e, 331f, 331g, 332c, 332d, 332e, 332f, 332g Out-slot conductor
331c, 332c head
331d, 331e, 331f, 331g, 332d, 332e, 332f, 332g
331,332 U-shaped segments
350 slots

Claims (8)

A U-phase coil having n (n ≧ 3) number of Un partial coils (U1, U2, U3...) connected in series and having one end connected to an input / output terminal.
A V-phase coil in which the n (n ≧ 3) number of Vn partial coils (V1, V2, V3...) Are connected in series and one end is connected to an input / output terminal;
The n (n ≧ 3) number of Wn partial coils (W1, W2, W3,...) Are connected in series, and one end is connected to an input / output terminal.
A U-phase slot group into which n (n ≧ 3) Un partial coils formed adjacent to each other in the circumferential direction are inserted;
A V-phase slot group into which n (n ≧ 3) Vn partial coils formed adjacent to each other in the circumferential direction are inserted;
An annular fixed group formed by a plurality of circumferentially arranged slot group groups each having a W-phase slot group in which n (n ≧ 3) Wn partial coils formed adjacent to each other in the circumferential direction are inserted. Child core,
A stator winding in which the other end of each phase coil is connected to each other;
A rotor formed with a plurality of magnetic poles along the circumferential direction;
A rotating electric machine comprising:
Each of the Un partial coils (U1, U2, U3,...) Includes an Unslot inner conductor portion accommodated in a corresponding U-phase slot group, and an Unslot conductor formed by connecting the Unslot inner conductor portion outside the slot. Each of the Vn partial coils (V1, V2, V3,...) In a Vn slot accommodated in a corresponding Vn slot group. Each of the Wn partial coils (W1, W2, W3) has a winding coil extending approximately one turn in the circumferential direction of the stator core by a conductor portion and a conductor portion outside the slot connecting the conductor portion in the Vn slot outside the slot. ,... Are substantially arranged in the circumferential direction of the stator core by a Wn slot inner conductor portion accommodated in the corresponding Wn slot group and an outer slot conductor portion connecting the Wn slot inner conductor portion outside the slot. 1 Has a circling coil extending,
The in-slot conductor portion of each partial coil connected to the input / output terminal is accommodated in a slot other than a circumferential end slot of the U-phase slot group, the V-phase slot group, and the W-phase slot group, respectively. Rotating electric machine. The in-slot conductor portions of the partial coils connected to the neutral points of the Un partial coil, the Vn partial coil, and the Wn partial coil are respectively the U phase slot group, the V phase slot group, and the W The rotating electrical machine according to claim 1, wherein the rotating electrical machine is housed in a slot at a circumferential end of the phase slot group. The slot is formed to accommodate a plurality of in-slot conductor portions in the radial direction,
The circular coil has a plurality of U-shaped segments integrally formed by the outer conductor portion of the slot and the pair of inner conductor portions of the slot,
The outer conductor portion of the slot is continuous with one end of each of the pair of in-slot conductor portions, and a head portion that is a U-shaped conductor provided to protrude from one end side of the stator core;
Continuing with the other ends of the pair of in-slot conductor portions, and having a pair of protruding end portions that protrude to the other end side of the stator core and extend in a substantially circumferential direction,
3. The rotating electrical machine according to claim 1, wherein the pair of in-slot conductor portions are accommodated in slots at the same position in the circumferential direction in the slot group of the same phase and at different positions in the radial direction. The U-phase coil, the V-phase coil, and the W-phase coil are the slots of the partial coils connected to the neutral point in a single U-phase slot group, V-phase slot group, and W-phase slot group, respectively. 3. The rotation according to claim 2, wherein an in-slot conductor portion of another partial coil is accommodated between the inner conductor portion and the in-slot conductor portion of each partial coil connected to the input / output terminal. Electric. The U-phase coil, the V-phase coil, and the W-phase coil are each a slot of each partial coil connected to the input / output terminal in a single U-phase slot group, V-phase slot group, and W-phase slot group. The inner conductor portion is in the central portion in the slot group, and the partial coil connected to the neutral point is in the end position in the slot group,
2. The rotating electrical machine according to claim 1, wherein the in-slot conductor portion closer to the partial coil connected to the neutral point is accommodated at a position closer to the end in the slot group. A plurality of the heads of the U-shaped segments are arranged in the radial direction in slots of the stator core,
4. The rotating electrical machine according to claim 3, wherein the U-shaped segment disposed on the radially outer side is greatly inclined in the outer diameter direction with respect to the axial direction of the stator core. 2. The rotating electrical machine according to claim 1, wherein a plurality of the Un partial coil, the Vn partial coil, and the Wn partial coil are arranged in parallel in a radial direction in the slot of the stator core. A first phase slot group composed of n (n ≧ 3) first n slots formed adjacent to each other in the circumferential direction;
A second phase slot group comprising n (n ≧ 3) second n slots formed adjacent to each other in the circumferential direction;
A group of slot groups having an annular stator core formed in a plurality of circumferential directions,
A first phase coil in which the n (n ≧ 3) number of first n partial coils (11th, 12th, 13th...) Are connected in series, and one end is connected to an input / output terminal.
The n (n ≧ 3) number of second n partial coils (21st, 22nd, 23rd,...) Are connected in series, and one end is connected to an input / output terminal. ,
A stator winding wired so that the other ends of the phase coils are connected to each other;
A rotor formed with a plurality of magnetic poles along the circumferential direction;
A rotating electric machine comprising:
Each of the first n partial coils (eleventh, twelfth, thirteenth,...) Includes a first n-slot inner conductor portion accommodated in the corresponding first n-slot, and the first n-slot inner conductor portion. Each of the second n partial coils (the twenty-first, twenty-second, twenty-third,...) Has a circular coil extending approximately one turn in the circumferential direction of the stator core by an outer-slot conductor portion connected outside the slot. Approximately one turn in the circumferential direction of the stator core by a second n-slot inner conductor portion accommodated in the corresponding plurality of second n-slots and an outer-slot conductor portion connecting the second n-slot conductor portions outside the slot. The in-slot conductor portion of each partial coil that has an extending coil and is connected to the input / output terminal is accommodated in a slot other than the slot at the circumferential end of the first phase slot group and the second phase slot group, respectively. Characteristic rotation Machine.

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