JP6441762B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine.

Conventionally, it is known to wind a coil winding around a stator of a rotating electrical machine (see, for example, Patent Document 1).
For example, in order to realize a general three-phase four-turn single star connection, a U-phase coil, a V-phase coil, and a W-phase coil corresponding to three phases are prepared. Are wound around the stator core of the stator. The winding of each coil is composed of four conducting wires connected in series, and each conducting wire is wound one by one to form a total of four turns. As a result, in a pair of slots adjacent to each other in the circumferential direction, the same-phase conductors are arranged at four positions (layers) in the slot along the radial direction. Such in-slot positions are repeated in the order of the circumferential direction for each slot: U phase, U phase, V phase, V phase, W phase, W phase, U phase, U phase,.

  By the way, in the winding of each coil, a voltage drop occurs between the current input end and the output end. For this reason, the conductors arranged at the four in-slot positions in the same slot have different lengths from the input end. Therefore, even if the voltage drops in the conductors in the same slot, The degree of voltage drop in the conductor close to the terminal end, that is, the conductor through which current flows later is larger than the voltage drop in the conductor near the end, that is, the conductor through which current first flows.

  Therefore, when four windings are applied by wave winding, the first conducting wire (the side closer to the input end) and the fourth conducting wire (the side closer to the output end) are adjacent in the same slot. Then, the mutual shared voltage (potential difference) becomes large, and there is a possibility that a problem arises in the dielectric strength between the two.

  FIG. 14 is a development view for explaining the current flow order of the conductors U1, U2, U3, U4 in the slot 15 and the positions L1, L2, L3, L4 in the slot with respect to the stator core 12 of the conventional rotating electrical machine 10; FIG. 15 is a partially enlarged schematic view for explaining the current flow order of the conductors U1, U2, U3, U4 in the slot 15 and the positions L1, L2, L3, L4 in the slot.

  Here, the numerical value enclosed in parentheses in the figure is the slot number of the slot 15 provided in the stator core 12. L1 to L4 indicate in-slot positions, with L4 being the innermost side of the slot 15 (the outer peripheral side of the stator core 12) and L1 being the innermost opening side (the inner peripheral side of the stator core 12). The rotating electrical machine 10 is a three-phase (U phase, V phase, W phase) AC type having a total of 8 poles and 48 slots.

  14 and 15, of the three phases, conductive wires U1, U2, U3, and U4 that constitute a U-phase coil are shown. Each conducting wire U1, U2, U3, U4 is connected in series in this order, and a current flows in this order. Of the “U1-1”, “U2-2”, “U3-3”, and “U4-4” illustrated, “U1”, “U2”, “U3”, and “U4” are the numbers of the conductors. “-1”, “−2”, “−3”, and “−4” indicate the flow order of current supplied by applying a predetermined voltage to the coil.

  The conducting wire U1 through which current flows first is positioned at the slot inner position L4 in the slots (1), (2), (13), (14), (25), (26), (37), and (38). In the slots (7), (8), (19), (20), (31), (32), (43), and (44), the slot is located at the in-slot position L3. The conductor U2 through which current flows secondly is located in the slot position L3 when the conductor U1 is located in the slot position L4 and in the slot 15 when the conductor U1 is located in the slot position L3. Located at L4.

  On the other hand, the conducting wire U3 through which the current flows third is the slot position L2 in the slots (1), (2), (13), (14), (25), (26), (37), and (38). In slot (7), (8), (19), (20), (31), (32), (43), (44), it is located in the in-slot position L1. The fourth lead U4 through which current flows is located in each slot 15 at the in-slot position L1 when the lead U3 is located at the in-slot position L2, and at the in-slot position when the lead U3 is located at the in-slot position L1. Located at L2.

JP2011-109894A

  However, conventionally, the above-mentioned shared voltage is not taken into consideration, and in order to improve the dielectric strength, it is possible to increase the insulation film of the conductor or wrap the conductor with insulating paper (for example, special characteristics). JP 2010-119296 A, JP 2012-14673 A). When the insulating film of the conductive wire is thickened, it is necessary to further coat an insulating resin on the upper side of the insulating film. In addition, when wrapping with insulating paper, it is necessary to wrap the lead wire with insulating paper folded into a complicated shape. In either case, production costs and labor costs increase, and heat dissipation deteriorates. Problem arises. Also, if the conductor cross-sectional area of the conductor is reduced by the amount of the insulation coating in consideration of the arrangement space in the slot, etc., the electrical resistance of the conductor increases and heat generation during energization increases, so the conductor becomes even hotter. Is concerned.

  14 and 15, the slots (1), (2), (13), (14), (25), (26), (37), and (38) are adjacent in the radial direction. From the positional relationship between the positions of the matching conductors in the slot, the conductor U1 through which current flows first and the conductor U2 through which current flows are adjacent to each other in the slot positions L4 and L3. The difference in the flow order is “1”. Even in the in-slot positions L3 and L2, the difference in the current flow order in the conductors U2 and U3 is “1”, and in the in-slot positions L2 and L1, the difference in the current flow order in the conductors U3 and U4 is “1”. Is.

  On the other hand, in the slots (7), (8), (19), (20), (31), (32), (43), (44), the conductors U1, U2 at the in-slot positions L4, L3. The difference in the current flow order at 1 is “1”, and even in the in-slot positions L2 and L1, the difference in the current flow order in the conductors U3 and U4 is “1”. In the limit, the conductor U1 through which the current flows first and the conductor U4 through which the fourth flows are adjacent to each other, and therefore the difference in the current flow order between these conductors U1 and U4 is “3”. Accordingly, the shared voltage increases at the in-slot positions L3 and L2 where the difference in the flow order is “3”, and various adverse effects on the dielectric strength occur.

  An object of the present invention is to provide a rotating electrical machine that can solve various problems caused by a large shared voltage.

  The rotating electrical machine of the present invention includes an annular stator core having a plurality of teeth and a plurality of slots alternately formed in the circumferential direction, and a coil that is electrically wound at least four times per phase with respect to the stator core. The coil is composed of at least four first conductors, second conductors, third conductors, and fourth conductors electrically connected in series, and is radially adjacent to the inner periphery of the slot. The first conducting wire and the second conducting wire of the same phase are located at a position in the pair of slots, and each of the first conducting wire and the second conducting wire is a unit of a pair of slots adjacent in the circumferential direction. The position in the slot is changed every time, and a pair of positions in the slot adjacent to the inner periphery and radially adjacent to the first conductor and the second conductor in the slot are arranged in front of the same phase. The third conductive wire and the fourth conductive wire are located, and the third conductive wire and the fourth conductive wire have a pair of slots adjacent to each other in the circumferential direction as a unit, and the positions in the slots are switched for each unit. The connecting wire extending over the series circuit constituted by the second conducting wire and the series circuit constituted by the third conducting wire and the fourth conducting wire is the terminal end or the starting end of the conducting wire located at the innermost slot position. And the terminal ends of a pair of conductors adjacent to each other in the radial direction inside the slot. And a connection between the start end and the start end.

  The rotating electrical machine of the present invention includes an annular stator core having a plurality of teeth and a plurality of slots alternately formed in the circumferential direction, and a coil that is electrically wound at least four times per phase with respect to the stator core. The coil includes at least four first conductors, second conductors, third conductors, and fourth conductors electrically connected in series, and the slots have the same phase as the first conductors. A conducting wire, a second conducting wire, a third conducting wire, and a fourth conducting wire are located along a radial direction, and among the first conducting wire, the second conducting wire, the third conducting wire, and the fourth conducting wire, they are adjacent to each other inside the slot. In the pair of conductors in the position where the current flows, the difference in the order in which the current flows is 2 or less.

  In the rotating electrical machine according to the present invention, the first conductor, the second conductor, the third conductor, and the fourth conductor are connected to each other in the same phase and between the phases in which the coils provided for each phase are connected to each other. It is preferable that the connecting wire and the lead wire connected to the input end of the coil are concentrated on one end side in the axial direction of the stator core.

  According to the present invention, by optimizing the current flow order to the first to fourth conductors and the connection form of the crossover wires, at least the first to fourth conductors positioned along the radial direction in the slot. Among them, the difference in the order of flow when a current is supplied is within 2 between a pair of conductors adjacent in the radial direction, and a large difference in potential between the two conductors is less likely to occur, and the shared voltage can be reduced. Therefore, since it is not necessary to apply a resin coating or wrap it with insulating paper in order to increase the thickness of the insulating film of the conducting wire, it does not require labor and material costs for manufacturing, and heat dissipation can be improved. Further, since such resin coating and insulating paper are not required, the cross-sectional area of the entire conducting wire can be maintained as it is, so that it is not necessary to reduce the conductor cross-sectional area of the conducting wire, and heat generation by the conducting wire itself can be suppressed.

The front view which shows the stator of the rotary electric machine which concerns on one Embodiment of this invention. The perspective view which shows the one end side of the axial direction of a stator. It is a top view which shows the one end side of the axial direction of a stator, and is a figure which shows substantially half of the coil for one phase wound by the wave. It is a top view which shows the one end side of the axial direction of a stator, and is a figure which shows the remaining half of the coil for one phase wound by the wave. FIG. The expanded view for demonstrating the flow order of the electric current of the conducting wire in the said embodiment, and the position in a slot. The partially expanded schematic diagram for demonstrating the electric current flow order and position in a slot in the said embodiment. The expanded view which shows 1st Example. The expanded view which shows 2nd Example. The expanded view which shows 3rd Example. The expanded view which shows 4th Example. The expanded view which shows 5th Example. The expanded view which shows 6th Example. The expanded view which shows 7th Example. The expanded view for demonstrating the flow order of the electric current of the conducting wire in the past, and the position in a slot. FIG. 5 is a partially enlarged schematic view for showing a conventional order of flow of conductors and positioning in a slot.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a stator 11 of a rotating electrical machine 10 according to the present embodiment. FIG. 2 is a perspective view showing one end side with respect to the axial direction of the axis C1. FIG. 3 is a plan view showing one end side in the axial direction, and is a view showing substantially half of the coil 13U for one phase wound in a wave. FIG. 4 is a diagram showing the remaining half of the coil 13 </ b> U for one phase that has been wave-wound.

  In the drawings used in the description of the present embodiment, members having the same functions as those shown in FIGS. 14 and 15 used in the description of the background art are denoted by the same reference numerals. Also, in the drawings used in the description of the present embodiment, the slot numbers of the slots 15 are sequentially written in parentheses (parentheses). The same applies to the following description. Furthermore, in the following description, the one end side may be referred to as “upper side” and the other end side may be referred to as “lower side” with respect to the axial direction of the axis C1 of the stator 11.

[Outline of rotating electrical machine]
1 to 4, the rotating electrical machine 10 is a three-phase (U-phase, V-phase, W-phase) eight-pole AC permanent that drives, for example, an upper revolving unit of a construction machine (not shown) to a lower traveling unit. Configured as a magnet synchronous motor. The rotating electrical machine 10 includes a cylindrical stator 11 and a rotor that is rotatably accommodated in the stator 11.

  The stator 11 includes a stator core 12 configured by laminating a plurality of annular electromagnetic steel plates, and three-phase coils 13U, 13V, and 13W formed by windings having a rectangular cross section wound around the stator core 12. Is provided. In the present embodiment having three phases and eight poles, 48 teeth 14 and slots 15 are alternately formed in the stator core 12 at equal intervals in the circumferential direction (the same as the rotation direction in the rotating electrical machine 10). As the coils 13U, 13V, and 13W, a 4-turn single star connection is adopted.

  As shown in FIGS. 1 and 2, on the upper side, which is one end side of the stator core 12 in the axial direction, a part of the coils 13U, 13V, and 13W is protruded in a piece shape toward the upper side, corresponding to the number of slots 15. The 48 rows of projecting piece portions are linearly formed along the radial direction. The same applies to the lower side which is the other end side of the stator core 12.

  The windings of the coils 13U, 13V, and 13W are composed of a large number of winding segments that have a pine needle shape by previously welding one end of a pair of short conductors (half coils). Both ends of the winding segment are inserted from the upper side which is the insertion side of the pair of slots 15 spaced apart by a predetermined pitch in the circumferential direction. At this time, the position in the slot in the slot 15 differs between the one side and the other side of the winding segment. That is, the central portion of the winding segment is located above the stator core 12 to form a projecting piece portion and to constitute the upper turn change portion.

  One end of the winding segment projecting from the lower side, which is the opposite side of the slot 15, has another winding segment projecting from the lower side of the slot 15 further spaced apart from the pair of slots 15 by a predetermined pitch in the circumferential direction. Welded with the other end. The lower protruding piece portion formed at this time is a welded portion of 48 rows on one side, and is also a portion to which a connecting wire described later is welded. The welded portion to be welded after the winding segment is inserted is the stator core. 12 will be aggregated below. In addition, the connecting portions between the coils 13U, 13V, and 13W provided for each phase and the lead wires connected to the input ends of the coils 13U, 13V, and 13W are also connected to the stator core 12. Aggregated on the lower side. Further, the lower protruding piece portion is also a lower turn change portion.

[Description of coil]
As a specific configuration and shape of the coils 13U, 13V, and 13W, the U-phase coil 13U will be described below as a representative.
3 and 4, the winding of the coil 13U has a total of four flat rectangular conductors U1 (first conductor), U2 (second conductor), U3 (third conductor), U4 (fourth) having a square cross section. It is the structure which connected the conducting wire) in series in the predetermined order. The rectangular conductors U1, U2, U3, and U4 are actually wound around the same stator core 12 as shown in FIG. 3 and FIG. 4 in a superimposed manner, but here, for convenience of drawing. The flat conductive wires U1 and U3 are shown in FIG. 3, and the flat conductive wires U2 and U4 are shown in FIG.

  Each of the rectangular conductive wires U1, U2, U3, U4 is structurally wound twice with respect to the stator core 12, but electrically only one turn. Therefore, the four windings U1, U2, U3, U4 are connected in series to form a single winding, which is electrically wound around the stator core 12 four times. This constitutes a four-turn single star connection.

  As in the conventional case, the rectangular conductive wires U1 and U2 are located at the back side of the slot 15 or in the in-slot positions L4 and L3 (FIGS. 5 and 6). The rectangular conductive wires U3, U4 are located at the opening side of the slot 15 or in-slot positions L2, L1 close thereto. On the upper side and the lower side of the stator 11, portions of the flat conductive wires U 1, U 2, U 3, U 4 exposed to the outside of the slot 15 appear in a crank shape having a turn change portion. One end of the winding of the coil 13U constituted by such flat conductive wires U1, U2, U3, U4 is an input end, and the other end is an output end. The output end is joined to the output ends of the other coils 13V and 13W to form a neutral point.

[Flat conductor U1]
Below, the flat conducting wire U1 will be described more specifically. First, the starting end portion of the flat conducting wire U1 is located below the stator core 12 at an intermediate position in the circumferential direction between the slot (1) and the slot (7) shown in FIG. Configured as part. The flat conductor U1 will be described in accordance with the direction in which the current flows. The protruding piece portion constituting the start end portion is located below the in-slot position L4, and from here the coil pitch is 3 pitches along the circumferential direction. It extends in the counterclockwise direction and reaches below the in-slot position L4 of the slot (1).

  Thereafter, the flat wire U1 passes through the in-slot position L4 of the slot (1) from the lower side to the upper side. The flat lead wire U1 coming out from the upper side of the slot (1) extends counterclockwise by 3 pitches above the slot internal position L4, and then moves above the slot internal position L3 via the turn change portion. Above the in-slot position L3, it is further extended counterclockwise by 3 pitches and reaches above the slot (43).

  From here, the flat lead wire U1 passes through the in-slot position L3 of the slot (43) from the upper side to the lower side and exits from the lower side of the slot (43). The flat wire U1 extends below the in-slot position L3 in the three pitch counterclockwise direction, then moves below the in-slot position L4, and further extends in the three pitch counterclockwise direction to the slot (37). To the bottom. Next, the flat wire U1 passes through the in-slot position L4 of the slot (37) from the lower side to the upper side.

  Hereinafter, the flat wire U1 passes through the in-slot position L3 of the slot (31) from the upper side to the lower side, passes through the in-slot position L4 of the slot (25) from the lower side to the upper side, and passes through the slot (19). The in-slot position L3 passes from the upper side to the lower side, the in-slot position L4 of the slot (13) passes from the lower side to the upper side, and the in-slot position L3 of the slot (7) goes from the upper side to the lower side. Pass through.

  The flat conducting wire U1 coming out from the lower side of the in-slot position L3 of the slot (7) is extended by 3 pitches in the counterclockwise direction. The extended end is composed of a projecting piece projecting downward. This projecting piece portion is connected to the projecting piece portion below the in-slot position L4 at the position returned by one pitch in the clockwise direction via a jumper. As a result, the flat conducting wire U1 structurally ends one turn. And the flat conducting wire U1 from here will overlap with the 1st roll and an axial direction, ie, up and down.

  The flat lead wire U1 reaches below the in-slot position L4 of the slot (2), passes through the in-slot position L4 of the slot (2) from the lower side to the upper side, and exits above. Further, the flat lead wire U1 is extended in the counterclockwise direction by 3 pitches from here, and the slot (44), the slot (38), the slot (32), the slot (26), and the slot are changed while changing the vertical position with the first turn. (20), passes through the slot (14) and the slot (8).

  The flat conducting wire U1 coming out from the lower side of the in-slot position L3 of the slot (8) is extended by 3 pitches in the counterclockwise direction. As a result, the second structural winding, that is, the first electrical winding by the flat wire U1, is completed. In addition, the protruding piece portion provided at the final extending end is a terminal portion of the flat conducting wire U1. The terminal portion is connected to a protruding piece portion provided as a starting end portion of the flat conducting wire U2 (FIG. 4) via a jumper wire, and the connection via the jumper wire will be described later.

[Flat rectangular wire U2]
The flat lead wire U2 includes an in-slot position L3 of the slots (1), (2), (13), (14), (25), (26), (37), (38) and the slots (7), ( 8), (19), (20), (31), (32), (43), (44), and passes through the in-slot position L4 and is electrically wound around the stator core 12. Thus, in the same slot, when the flat conducting wire U1 is located at the in-slot position L4, the flat conducting wire U2 is located at the in-slot position L3. On the contrary, when the flat conducting wire U1 is located at the in-slot position L3, the flat conducting wire U2 is located at the in-slot position L4.

  Further, in the region where the flat conducting wire U 1 appears on the upper side of the stator core 12, the flat conducting wire U 2 appears on the lower side of the stator core 12. On the other hand, in the region where the flat conducting wire U1 appears on the lower side of the stator core 12, the flat conducting wire U2 appears on the upper side of the stator core 12. In this embodiment, the protruding piece portion provided as the terminal end of the electrically wound flat rectangular wire U2 is connected to the protruding piece portion provided as the starting end portion of the rectangular conductive wire U4 (FIG. 4) via the jumper wire. Connected. The connection via this crossover will also be described later.

[Flat conductors U3, U4]
The flat conductors U3 and U4 are similar to the flat conductors U1 and U2 in the slots (1), (2), (7), (8), (13), (14), (19), (20), ( 25), (26), (31), (31), (37), (38), (43), and (44) through the in-slot positions L1 and L2, and one turn with respect to the stator core 12 Is done. However, in the same slot, when the flat conducting wire U3 is located at the in-slot position L2, the flat conducting wire U4 is located at the in-slot position L1. Conversely, when the flat conducting wire U3 is located at the in-slot position L1, the flat conducting wire U4 is located at the in-slot position L2.

  Further, in a region where the flat conducting wire U3 appears on the upper side of the stator core 12, the flat conducting wire U4 appears on the lower side of the stator core 12. On the other hand, in the region where the flat conducting wire U3 appears on the lower side of the stator core 12, the flat conducting wire U4 appears on the upper side of the stator core 12. In this embodiment, the protruding piece portion provided as the terminal portion of the electrically wound flat rectangular wire U4 is formed on the protruding piece portion provided as the starting end portion of the flat rectangular wire U3 (FIG. 4) via the connecting wire. Connected. The connection via this crossover will also be described later.

  As described above, in the present embodiment, the rectangular conductors U1 and U2 of the same phase are located at the slot inner positions L4 and L3 provided near the outer periphery of the stator core 12 and adjacent in the radial direction inside the slot 15, The slot positions L4 and L3 are switched for each unit of a pair of slots 15 adjacent to each other in the circumferential direction. Similarly, the rectangular conductors U3 and U4 of the same phase are located at the slot positions L2 and L1 adjacent to the inner periphery of the stator core 12 and radially adjacent to the rectangular conductors U1 and U2, The slot positions L2 and L1 are switched for each unit of a pair of slots 15 adjacent to each other in the circumferential direction.

[Current flow order and position in the slot of each flat wire]
FIG. 5 is a diagram for explaining the current flow order of the rectangular conductors U1, U2, U3, U4 in the slot 15 and the positions L1, L2, L3, L4 in the slot with respect to the stator core 12 of the rotating electrical machine 10 in the present embodiment. FIG. 6 is a partially enlarged schematic view for explaining the current flow order of the rectangular conductive wires U1, U2, U3, and U4 in the slot 15 and the positions L1, L2, L3, and L4 in the slot. The way of viewing FIGS. 5 and 6 is the same as that of FIGS. 14 and 15 already described.

  5 and 6, the rectangular conductor U1 through which the current flows first is the slot (1), (2), (13), (14), (25), (26), (37) as in the conventional case. ), (38) is located at the slot inner position L4, and slots (7), (8), (19), (20), (31), (32), (43), (44) are slots. Located in the inner position L3. Similarly to the prior art, the rectangular conducting wire U2 through which current flows secondly is located at the in-slot position L3 when the rectangular conducting wire U1 is located at the in-slot position L4, and the rectangular conducting wire U1 is located at the in-slot position L3. When it is, it is located in the slot position L4.

  On the other hand, the flat lead wire U3 is located at the slot inner position L2 in the slots (1), (2), (13), (14), (25), (26), (37), and (38). In (7), (8), (19), (20), (31), (32), (43), (44), it is located at the in-slot position L1. In each slot, the flat conducting wire U4 is located in the in-slot position L1 when the flat conducting wire U3 is located in the in-slot position L2, and is located in the in-slot position L2 when the flat conducting wire U3 is located in the in-slot position L1. . That is, the positions of the flat conductors U3 and U4 in the slot are the same as the conventional one.

  However, in this embodiment, the order of the currents flowing through the flat conductors U3 and U4 is reversed from the conventional one shown in FIGS. That is, in the present embodiment, the current flows next to the flat conducting wire U2 is the flat conducting wire U4. After flowing through the flat conducting wire U4, the current finally flows through the flat conducting wire U3. This is because the terminal end of the flat conductor U2 is connected to the starting end of the flat conductor U4 via a crossover, and the windings of the coil 13U are connected in series in the order of the flat conductors U1, U2, U4, U3. This is because the current is supplied in this order.

  According to the present embodiment, in the slots (1), (2), (13), (14), (25), (26), (37), (38), the slots of the conductive wires adjacent in the radial direction From the positional relationship of the inner positions, the rectangular conductors U1 through which current flows first and the rectangular conductor U2 through which current flows are adjacent to each other at the slot inner positions L4 and L3, as in the prior art. The difference in the current flow order at “1” is “1”. Even in the in-slot positions L2 and L1, the difference in the current flow order in the flat conductors U3 and U4 is “1”.

  On the other hand, at the in-slot positions L3 and L2, the flat conducting wire U2 through which current flows secondly and the flat conducting wire U3 through which fourth current flows are adjacent to each other, and therefore the difference in the current flow order between these flat conducting wires U2 and U4 is “2”. Is. Conventionally, the difference in the current flow order in the rectangular conductors U2 and U3 at the in-slot positions L3 and L2 is “1”, but in the present embodiment, the difference is increased to “2”. However, the difference “2” in the current flow order is a level at which no problem arises in the dielectric strength between the flat conductors U2 and U4 as compared with the difference “3” in the current flow order, and improves the dielectric strength. Therefore, complicated processing is not necessary.

  Further, in the slots (7), (8), (19), (20), (31), (32), (43), (44), the rectangular conductors U1, U2 are used in the slot positions L4, L3. The difference in the current flow order is “1”, and the difference in the current flow order in the rectangular conductors U3 and U4 is “1” even in the in-slot positions L2 and L1. And, in the in-slot positions L3 and L2, the flat conducting wire U1 through which current flows first is adjacent to the flat conducting wire U4 through which third flows, so the difference in the current flow order between these flat conducting wires U1 and U4 is “2”. Therefore, in the slot positions L3 and L2, the difference in the current flow order is “3” in the past, and the shared voltage is increased to cause various adverse effects. However, the difference in the current flow order in this embodiment is different. Since “2” is “2”, the shared voltage can be reduced, and various adverse effects can be suppressed.

  As described above, according to the present embodiment, in the in-slot positions L1 to L4, even when any one of the rectangular conductive wires U1, U2, U3, and U4 is adjacent to each other, the difference in the current flow order. Is “2” or less and does not become “3”. For this reason, the shared voltage between the two can be reliably suppressed, and the above-described object of the present invention can be achieved.

[Specific connection position of crossover]
In the above-described embodiment, the terminal portion of the flat conducting wire U1 through which current flows first is simply connected to the starting end portion of the flat conducting wire U2 through which current flows through a crossover. Further, it has been described that the terminal portion of the flat conducting wire U2 through which current flows second is connected to the starting end portion of the flat conducting wire U4 through which current flows third through a crossover. And it demonstrated that the termination | terminus part of this flat conducting wire U4 was connected via the crossover to the starting end part of the flat conducting wire U3 through which an electric current flows 4th. In the following, based on FIGS. 7 to 12, the positions of the starting end and the terminal end of the flat conducting wires U1, U2, U3, U4 will be clarified and their connecting positions will be described.

  In the above-described embodiment, it has been described that the current flows through the rectangular conductive wires U1, U2, U3, and U4 in the order of the first, second, fourth, and third. However, in FIGS. The order of flow was made finer in correspondence with the number of slots 15. That is, the rectangular conducting wires U1, U2, U3, U4 are connected in series and regarded as one winding, and the windings are sequentially numbered according to the direction of current flow from the current input end. By assigning such numbers to the slots 15, as will be described later, even if the difference in the current flow order in the units of the rectangular conductors U1, U2, U3, U4 is “2”, any slot It is possible to calculate whether the shared voltage is the largest in the slot 15 of the number.

(First embodiment)
FIG. 7 is a development view according to the first embodiment.
In FIG. 7 and FIG. 3 and FIG. 4, the current is first supplied to the flat wire U1 located at the in-slot position L4 of the slot (1). Specifically, the projecting piece immediately before the slot (1) (immediately upstream with respect to the current flow direction) is set as the starting end of the flat wire U1, that is, the input end as a winding, Supplied. Therefore, “1” is written in the locations corresponding to the slot (1) and the in-slot position L4 shown in FIG. 7 as the order when the current flow order is further refined.

  Next, the current flows in the counterclockwise direction through the flat rectangular wire U1 shown in FIG. 3, and passes through the in-slot position L3 of the slot (43) via a turn change portion in the middle. For this reason, “2” is written in the locations corresponding to the slot (43) and the in-slot position L3 shown in FIG. Hereinafter, in the order of “3” to “16”, a current flows through the flat rectangular wire U1 passing through the in-slot positions L4 and L3 of each slot 15. The flat lead wire U1 is provided with a projecting piece portion as a terminal portion at a position immediately after coming out of the last (16) -th passing slot (8).

  What is connected to this terminal portion via the crossover J1 is the starting end portion of the flat rectangular wire U2 through which the current flows “17th”. This starting end portion is constituted by a protruding piece portion immediately before the slot slot (2). The current flowing into the starting end portion of the flat wire U2 passes through the flat wire U2 arranged at the in-slot position L3 of the slot (2), and is then placed at the in-slot position L1 of the slot (8) as the “18th” position. Passes through the flat rectangular wire U2. Hereinafter, in the order of “19” to “32”, a current flows through the flat rectangular wire U2 passing through the in-slot positions L4 and L3 of each slot 15. The flat lead wire U2 is provided with a protruding piece portion as a terminal portion at a position immediately after coming out of the last “32” -th passing slot (43).

  And, it is the starting end of the rectangular conducting wire U4 through which the current flows at the “33” th position that is connected to the terminal end via the crossover J2. That is, the connecting wire J2 extending between the outer peripheral side and the inner peripheral side is formed by connecting the terminal end of the flat rectangular wire U2 located at the innermost slot position L4 on the outermost peripheral side and the rectangular conductive wire U4 positioned at the innermost slot side position L1. Connected to the start end. This starting end portion is also constituted by a protruding piece portion immediately before the slot (2), but the radial position is different from the starting end portion to which the crossover wire J1 is connected. The current flowing into the starting end of the flat wire U4 passes through the flat wire U4 arranged at the in-slot position L1 of the slot (2), and is then placed at the in-slot position L2 of the slot (8) as the “34th” position. It passes through the formed rectangular conducting wire U4. Hereinafter, in the order of “35” to “48”, a current flows through the flat rectangular wire U4 passing through the in-slot positions L1, L2 of each slot 15. The flat lead wire U4 is provided with a protruding piece portion as a terminal portion at a position immediately after coming out of the last (48) -th passing slot (43).

  Further, what is connected to this terminal portion via the crossover wire J3 is the starting end portion of the flat conducting wire U3 through which the current flows “49th”. This starting end portion is constituted by a protruding piece portion immediately before the slot (37). The current flowing into the starting end of the flat wire U3 passes through the flat wire U3 arranged at the in-slot position L2 of the slot (37), and is then placed at the in-slot position L1 of the slot (31) as the “50th” position. It passes through the formed rectangular conducting wire U3. Hereinafter, in the order of “51” to “64”, a current flows through the flat rectangular wire U3 passing through the in-slot positions L1 and L2 of each slot 15. And the flat lead wire U3 is provided with a projecting piece portion as an output end at a position immediately after coming out of the last “64” -th passing slot (44).

  Specifically, for each slot 15, the difference in order between the in-slot position L4 and the in-slot position L3 of the slot (1) is “24”. The difference in order between the in-slot position L3 and the in-slot position L2 is “30”. The difference in order between the in-slot position L2 and the in-slot position L1 is “14”. In slot (2), they are “8”, “46”, and “30”, respectively. Hereinafter, the order difference for each slot 15 can be calculated in the same manner.

  According to the first embodiment described above, a series circuit configured by connecting the flat conducting wire U1 and the flat conducting wire U2 in series, and a series circuit configured by connecting the flat conducting wire U3 and the flat conducting wire U4 in series. The connecting wire J2 is connected between the terminal end portion of the flat rectangular wire U2 positioned at the innermost slot position on the outermost peripheral side and the starting end portion of the flat rectangular wire U4 positioned at the innermost slot position on the innermost peripheral side. The same applies to the second to sixth embodiments described later.

  As a result, according to the first embodiment, the difference in the order in which the current flows in the in-slot positions L3 and L2 is the largest “46”. The corresponding slots 15 are slots (2) and (43). However, as described in the above embodiment, when viewed in units of the rectangular conductors U1, U2, U3, and U4, the difference in the order of current flow at the in-slot positions L3 and L2 is “2”. There is no problem in terms of voltage.

As a result, “46”, which is the difference in the current flow order obtained in the first embodiment, is used as an index for specifying the connection location of the crossover lines J1, J2, J3 so that the shared voltage becomes smaller. It can be said that it is effective. The same applies to the second to sixth embodiments.
In the first to sixth embodiments, in particular, the connecting portions of the connecting wires J2 and J3 are different, and there is a high possibility that the connecting wires J2 and J3 have different lengths and handling. For this reason, making the connecting portions of the connecting wires J2 and J3 different is effective in determining a simpler connecting method of the connecting wires J2 and J3.
Furthermore, since the welded portion of the winding segment is provided below the stator core 12, the welding operation can be quickly performed if such connections of the connecting wires J 1, J 2, J 3 are also gathered below the stator core 12. And workability can be improved.

(Second embodiment)
FIG. 8 is a development view according to the second embodiment. In the second embodiment and the following third to sixth embodiments, the first embodiment relates to the start end (input end) and end portion of the flat conductor U1, and the start end and end portion of the flat conductor U2. Is the same. Therefore, in the second to sixth embodiments, the description starts from the description of the connection destination of the terminal portion of the flat conductor U2 and the connecting wire J2.

  In FIG. 8, FIG. 3, and FIG. 4, it is the starting end portion of the flat conducting wire U4 through which the current flows at the “33” th position that is connected to the terminal portion of the flat conducting wire U2 via the crossover wire J2. This starting end portion is constituted by a protruding piece portion immediately before the slot (26). The current flowing into the starting end of the flat wire U4 passes through the flat wire U4 disposed at the in-slot position L1 of the slot (26), and is then placed at the in-slot position L2 of the slot (32) as the “34th” position. It passes through the formed rectangular conducting wire U4. Hereinafter, in the order of “35” to “48”, a current flows through the flat rectangular wire U4 passing through the in-slot positions L1, L2 of each slot 15. The flat lead wire U4 is provided with a projecting piece portion as a terminal portion at a position immediately after coming out of the last (48) -th passing slot (19).

  Further, what is connected to this terminal portion via the crossover wire J3 is the starting end portion of the flat conducting wire U3 through which the current flows “49th”. This starting end portion is constituted by a protruding piece portion immediately before the slot (13). The current flowing into the starting end portion of the flat wire U3 passes through the flat wire U3 arranged at the in-slot position L2 of the slot (13), and is then placed at the in-slot position L1 of the slot (7) as the “50th” position. It passes through the formed rectangular conducting wire U3. Hereinafter, in the order of “51” to “64”, a current flows through the flat rectangular wire U3 passing through the in-slot positions L1 and L2 of each slot 15. And the flat lead wire U3 is provided with a projecting piece portion as an output end at a position immediately after coming out of the last (64) th passing slot (20).

  According to the second embodiment, the difference in the order in which the current flows at the in-slot positions L3 and L2 is the largest at “42”. The corresponding slots 15 are slots (2), (19), (26), and (43).

(Third embodiment)
FIG. 9 is a development view according to the third embodiment.
9, 3, and 4, the terminal portion of the flat wire U <b> 2 is connected to the starting end portion of the flat wire U <b> 4 through which the current flows “33” through the crossover wire J <b> 2. The starting end portion of the flat conducting wire U4 is constituted by a protruding piece portion immediately before the slot (38). The current flowing into the starting end portion of the flat wire U4 passes through the flat wire U4 disposed at the in-slot position L1 of the slot (38), and is then disposed at the in-slot position L2 of the slot (44) as the “34th” position. It passes through the formed rectangular conducting wire U4. Hereinafter, in the order of “35” to “48”, a current flows through the flat rectangular wire U4 passing through the in-slot positions L1, L2 of each slot 15. The flat lead wire U4 is provided with a projecting piece portion as a terminal portion at a position immediately after coming out of the last (48) th passing slot (31).

  Furthermore, the terminal portion of the flat conducting wire U4 is connected to the starting end portion of the flat conducting wire U3 through which the current flows “49th” by the crossover J3. The starting end portion of the flat conducting wire U3 is constituted by a protruding piece portion immediately before the slot (25). The current flowing into the starting end of the flat wire U3 passes through the flat wire U3 arranged at the in-slot position L2 of the slot (25), and is then placed at the in-slot position L1 of the slot (19) as the “50” th. It passes through the formed rectangular conducting wire U3. Hereinafter, in the order of “51” to “64”, a current flows through the flat rectangular wire U3 passing through the in-slot positions L1 and L2 of each slot 15. The flat lead wire U3 is provided with a protruding piece portion as an output end at a position immediately after coming out of the last (64) -th passing slot (32).

  According to the third embodiment, the difference in the order in which the current flows at the in-slot positions L3 and L2 is the largest “44”. The corresponding slots 15 are slots (2) and (31).

(Fourth embodiment)
FIG. 10 is a development view according to the fourth embodiment.
10, 3, and 4, the terminal portion of the flat wire U <b> 2 is connected to the starting end portion of the flat wire U <b> 4 through which the current flows “33” through the crossover wire J <b> 2. The starting end portion of the flat conducting wire U4 is constituted by a protruding piece portion immediately before the slot (14). The current flowing into the starting end of the flat wire U4 passes through the flat wire U4 disposed at the in-slot position L1 of the slot (14), and is then placed at the in-slot position L2 of the slot (20) as the “34th” position. It passes through the formed rectangular conducting wire U4. Hereinafter, in the order of “35” to “48”, a current flows through the flat rectangular wire U4 passing through the in-slot positions L1, L2 of each slot 15. The flat lead wire U4 is provided with a protruding piece portion as a terminal portion at a position immediately after coming out of the last (48) -th passing slot (7).

  Furthermore, the terminal portion of the flat conducting wire U4 is connected to the starting end portion of the flat conducting wire U3 through which the current flows “49th” by the crossover J3. The starting end portion of the flat conducting wire U3 is constituted by a protruding piece portion immediately before the slot (1). The current flowing into the starting end portion of the flat wire U3 passes through the flat wire U3 arranged at the in-slot position L2 of the slot (1), and is then placed at the in-slot position L1 of the slot (43) as the “50th” position. It passes through the formed rectangular conducting wire U3. Hereinafter, in the order of “51” to “64”, a current flows through the flat rectangular wire U3 passing through the in-slot positions L1 and L2 of each slot 15. And the flat lead wire U3 is provided with a projecting piece portion as an output end at a position immediately after coming out of the last (64) -th passing slot (8).

  According to the fourth embodiment, the difference in the order in which the current flows in the in-slot positions L3 and L2 is the largest “44”. The corresponding slots 15 are slots (14) and (43).

(5th Example)
FIG. 11 is a development view according to the fifth embodiment.
11, 3, and 4, the terminal portion of the flat wire U <b> 2 is connected to the starting end portion of the flat wire U <b> 4 through which the current flows “33” through the crossover wire J <b> 2. The starting end portion of the flat conducting wire U4 is constituted by a protruding piece portion immediately before the slot (14), as in the fourth embodiment. The current flowing into the starting end of the flat wire U4 passes through the flat wire U4 disposed at the in-slot position L1 of the slot (14), and is then placed at the in-slot position L2 of the slot (20) as the “34th” position. It passes through the formed rectangular conducting wire U4. Thereafter, similarly to the fourth embodiment, a current flows through the rectangular wire U4 passing through the in-slot positions L1 and L2 of the slots 15 in the order of “35” to “48”. The flat lead wire U4 is provided with a protruding piece portion as a terminal portion at a position immediately after coming out of the last (48) -th passing slot (7).

  Then, the terminal end of the flat conducting wire U4 is connected to the starting end of the flat conducting wire U3 through which the current flows “49th” by the crossover J3. In the fifth embodiment, the starting end portion of the flat conducting wire U3 is constituted by a protruding piece portion immediately before the slot (13), as in the second embodiment. The current flowing into the starting end portion of the flat wire U3 passes through the flat wire U3 arranged at the in-slot position L2 of the slot (13), and is then placed at the in-slot position L1 of the slot (7) as the “50th” position. It passes through the formed rectangular conducting wire U3. Hereinafter, in the order of “51” to “64”, a current flows through the flat rectangular wire U3 passing through the in-slot positions L1 and L2 of each slot 15. And the flat lead wire U3 is provided with a projecting piece portion as an output end at a position immediately after coming out of the last (64) th passing slot (20).

  According to the fifth embodiment, the difference in the order in which the current flows at the in-slot positions L3 and L2 is the largest “44”. The corresponding slot 15 is the slot (43).

(Sixth embodiment)
FIG. 12 is a development view according to the sixth embodiment.
12, 3, and 4, the end portion of the flat conducting wire U <b> 2 is connected to the starting end portion of the flat conducting wire U <b> 4 through which the current flows “33” -th through the connecting wire J <b> 2. The starting end portion of the flat conducting wire U4 is constituted by a protruding piece portion immediately before the slot (38), as in the third embodiment. The current flowing into the starting end portion of the flat wire U4 passes through the flat wire U4 disposed at the in-slot position L1 of the slot (38), and is then disposed at the in-slot position L2 of the slot (44) as the “34” th. It passes through the formed rectangular conducting wire U4. Thereafter, similarly to the fourth embodiment, a current flows through the rectangular wire U4 passing through the in-slot positions L1 and L2 of the slots 15 in the order of “35” to “48”. The flat lead wire U4 is provided with a projecting piece portion as a terminal portion at a position immediately after coming out of the last (48) th passing slot (31).

  Furthermore, the terminal portion of the flat conducting wire U4 is connected to the starting end portion of the flat conducting wire U3 through which the current flows “49th” by the crossover J3. In the sixth embodiment, the starting end portion of the flat conducting wire U3 is formed by a protruding piece portion immediately before the slot (37), as in the first embodiment. The current flowing into the starting end of the flat wire U3 passes through the flat wire U3 arranged at the in-slot position L2 of the slot (37), and is then placed at the in-slot position L1 of the slot (31) as the “50th” position. It passes through the formed rectangular conducting wire U3. Hereinafter, in the order of “51” to “64”, a current flows through the flat rectangular wire U3 passing through the in-slot positions L1 and L2 of each slot 15. And the flat lead wire U3 is provided with a projecting piece portion as an output end at a position immediately after coming out of the last “64” -th passing slot (44).

  According to the sixth embodiment, the difference in the order in which the current flows at the in-slot positions L3 and L2 is the largest “46”. The corresponding slot 15 is slot (2).

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the above embodiment, the description has been given of the four-turn single star connection in which the rectangular conductors U1, U2, U3, and U4 are connected in series. By connecting the flat rectangular conductors U3 and U4 in parallel, a four-turn double star connection may be used. Further, an 8-turn single star connection or an 8-turn double star connection may be realized by using eight rectangular conductors.

(Seventh embodiment)
FIG. 13 shows a developed view in the case of 8-turn single star connection as the seventh embodiment. In the case of 8-turn single star connection, the slot position in each slot 15 is provided from the innermost L1 to the outermost L8. In addition, as for the rectangular conductive wire used in each phase, there are four (U1 to U4) in the case of the 4-turn single star connection, whereas in the 8-turn single star connection, eight (U1 to U2) are doubled. U8).

  In FIG. 13, when an input end is provided at the innermost slot position L8 on the outermost peripheral side and an output end is provided at the inner slot position L1 on the innermost peripheral side, the slot positions L8, L7, L6, and L5 near the outer periphery are provided. The slot numbers through which the positioned flat conductors U1, U2, U3, U4 pass are the same as in the first embodiment shown in FIG. Further, the slot numbers through which the rectangular conductive wires U5, U6, U7, U8 located at the slot inner positions L4, L3, L2, L1 closer to the inner circumference pass are the same as those in the first embodiment shown in FIG. That is, in terms of structure, the wiring structure of the first embodiment is doubled on the outer peripheral side and the inner peripheral side of the slot 15.

  And in the part near an outer periphery, the crossover wires J1-J3 are connected so that an electric current may flow in order of the flat conducting wire U1, U2, U4, U3 similarly to 1st Example. Further, in the seventh embodiment, the flat conductor U3 is provided with a projecting piece portion as a terminal portion at a position immediately after coming out of the slot (44) passing through the “64” th pass, and the end of the flat conductor U3 is provided. This part is connected to the starting end part of the flat conducting wire U5 through which the current flows “65th” by the crossover J4.

  Hereinafter, the current flows in the order of “66” to “80” in the rectangular conductor U5 passing through the in-slot positions L3 and L4 of each slot 15, and then the terminal portion of the rectangular conductor U5 and the starting end of the rectangular conductor U6 are connected. The current flows through the connecting wire J5 through the connecting wire J5 in the order of “81” to “96” to the rectangular wire U6 passing through the slots L3 and L4. Furthermore, the current flows in the order of “97” to “112” through the connecting wire J6 to the rectangular conductive wire U8 passing through the in-slot positions L1, L2 of each slot 15, and then passes through the connecting wire J7. In the order of “113” to “128”, the current flows to the flat rectangular wire U7 passing through the in-slot positions L1, L2 of each slot 15. The terminal portion of the flat conducting wire U7 is provided as an output end.

  According to the seventh embodiment, the shared voltage increases between the in-slot positions L7 and L6 and between the in-slot positions L3 and L2, and the current flows as in the first embodiment. The difference in order is the largest, “46”. The corresponding slots 15 are again slot (2) and slot (43).

  Further, as a modified example of the present invention, as a suitable combination of the number of turns and the connection form, a single star connection may be formed with four, six, eight and ten flat conductors (corresponding to the number of turns). The double star connection may be formed as 8, 12, 16, or 20, or the triple star connection may be formed as 12, 18, 24, or 30.

  In the above-described embodiment, the 8-pole 48-slot (48 teeth) rotating electrical machine 10 has been described, but the present invention is not limited to this. For example, a rotating electrical machine in which the number of poles: number of slots = 2n: 12n... N is a natural number can be employed. That is, it is a rotating electrical machine having 2 poles, 12 slots, 4 poles, 24 slots, 6 poles, 36 slots, 10 poles, 60 slots, and the like.

  In addition, each of the rectangular conductive wires U1, U2, U3, and U4 in the embodiment is configured by one winding, but the rectangular conductive wire is configured by two windings, three windings, or the like. May be.

In the above-described embodiment and each example, it has been described that the rectangular conductive wire U1 has an input end and the flat conductive wire U3 has an output end. However, the flat conductive wire U4 has an input end, and the flat conductive wire U2 has an output end. It is also possible to pass the current in the order of the flat conductors U4, U3, U1, U2.
Further, the current may flow in the order of the rectangular conductive wires U2, U1, U3, U4, or the current may flow in the order of the rectangular conductive wires U3, U4, U2, U1.

  The present invention can be used for a motor, a generator, or a generator motor having both functions.

  DESCRIPTION OF SYMBOLS 10 ... Rotary electric machine, 12 ... Stator core, 13U, 13V, 13W ... Coil, 14 ... Teeth, 15 ... Slot, J1, J2, J3 ... Crossover, U1 ... Flat wire (first wire), U2 ... Flat wire (No. 2 conductors), U3 ... flat conductor (third conductor), U4 ... flat conductor (fourth conductor).

Claims (3)

An annular stator core having a plurality of teeth and a plurality of slots alternately formed in the circumferential direction;
A coil that is electrically wound at least four times per phase with respect to the stator core,
The coil is composed of at least four first conductors, second conductors, third conductors, and fourth conductors electrically connected in series,
The first conducting wire and the second conducting wire of the same phase are located in a pair of slots in the radial direction adjacent to the outer periphery inside the slot, and the first conducting wire and the second conducting wire are arranged in the circumferential direction. A pair of slots adjacent to each other as a unit, the position in the slot is switched for each unit,
The third and fourth conductors of the same phase are located in a pair of slot positions adjacent to the inner circumference and radially adjacent to the first and second conductors inside the slot. In addition, the third conductor and the fourth conductor have a pair of slots adjacent in the circumferential direction as a unit, and the positions in the slots are switched for each unit.
The connecting wire extending over the series circuit composed of the first conductor and the second conductor and the series circuit composed of the third conductor and the fourth conductor is a conductor located at the position in the slot on the outermost periphery side. A pair of conductors that are connected to the innermost circumferential side of the inner end of the slot or adjacent to the inner end of the slot in the radial direction. A rotating electrical machine characterized by being connected between the terminal end and the starting end of the conducting wire. An annular stator core having a plurality of teeth and a plurality of slots alternately formed in the circumferential direction;
A coil that is electrically wound at least four times per phase with respect to the stator core,
The coil is composed of at least four first conductors, second conductors, third conductors, and fourth conductors electrically connected in series,
Inside the slot, the first conductor, the second conductor, the third conductor, and the fourth conductor of the same phase are located along the radial direction,
Among the first conductive wire, the second conductive wire, the third conductive wire, and the fourth conductive wire, the difference in the order in which the current flows is 2 or less in a pair of conductive wires that are adjacent to each other inside the slot. Rotating electric machine. In the rotating electrical machine according to claim 1 or 2,
Crossover wires in the same phase that connect the first conductive wire, second conductive wire, third conductive wire, and fourth conductive wire to each other, crossover wires between phases that connect the coils provided for each phase, and the coil Lead wires connected to the input end of the stator are concentrated on one end side in the axial direction of the stator core.

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