JP2017017838A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of suppressing damage to a coating of a coil and reducing a height in an axial direction.SOLUTION: The rotary electric machine comprises a coil 13U formed from a lead wire having a flat cross section which turns at least twice around a stator core while including first turn units U11, U21 and second turn units U12, U22 and in which the first turn units U11, U21 and the second turn units U12, U22 are wound around a slot in a wavy manner in a regularly changed coil pitch Pc in a circumferential direction. At one end side of the stator core in the axial direction, each of the first turn units U11, U21 and the second turn units U12, U22 has a turn change part TC in the middle of a coil end part CE from the slot around which the first turn units and the second turn units are wound in the wavy manner to the other slot. One of the first turn units U11, U21 and one of the second turn units U12, U22 overlap the other first and second turn units in the axial direction over an entire region of the coil end part CE.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a rotating electrical machine.

Conventionally, it is known that a coil winding is wound around a stator (also referred to as a stator) of a rotating electrical machine (see, for example, Patent Documents 1 and 2).
In wave winding, both ends of a pine needle-shaped winding segment are inserted from the insertion side of the pair of slots of the stator, and one end of the winding segment protruding from the opposite insertion side of the slot and the pair of slots The other end of the other winding segment protruding from the opposite side of the slot spaced apart by a predetermined pitch in the rotation direction is welded.

  Further, in Patent Documents 1 and 2, on the slot insertion side, the top of the winding segment is twisted, and by reversing the front and back of the flat wire by this twist, the change of the position in the slot by the turn change, that is, The position of the slot in the depth direction (same as the radial direction of the stator) is changed, and the height of the winding segment protruding from the stator is lowered.

JP 2008-48488 A JP 2012-29370 A

  However, as in Patent Documents 1 and 2, if the height is lowered by twisting the crown, it is necessary to sharply twist the crown with a small bend R and the coating of the winding segment is likely to be damaged. . For this reason, in Patent Documents 1 and 2, there is a problem that the bending radius R of the crown is increased to some extent, and the torsional portion becomes large and the height cannot be lowered sufficiently.

  The objective of this invention is providing the rotary electric machine which can suppress damage to the coating | cover of a coil and can make the height of an axial direction low.

  The rotating electrical machine of the present invention has an annular stator core having a plurality of teeth and a plurality of slots alternately formed in the circumferential direction, and at least two turns having a first turn portion and a second turn portion with respect to the stator core. The first turn portion and the second turn portion including a coil formed of a conducting wire having a rectangular cross section that is wave-wound at a circumferential coil pitch that is regularly changed to the slot, and the axial direction of the stator core On the one end side, the first turn part and the second turn part are for changing the arrangement position in the radial direction in the slot in the middle of the coil end part from the slot to be wound to the other slot, respectively. A turn change portion, wherein one of the first turn portion and the second turn portion is located in front of the other end of the coil end portion. Wherein the overlap in the axial direction.

  In the rotating electrical machine of the present invention, the positional relationship of the overlap between the coil end portions of the first turn portion and the second turn portion overlapping in the axial direction is such that each time the coil end portion appears on one end side in the axial direction of the stator core, It is preferable that the first turn part and the second turn part are alternately switched.

  In the rotating electrical machine of the present invention, when the coil pitch of the first turn part and the second turn part on the other end side in the axial direction of the stator core is X, the coil pitch of the first turn part on the one end side is X + 1 and X-1 are alternately repeated in the circumferential direction, and when the coil pitch of the first turn part is X + 1, the coil pitch of the second turn part on the one end side is X-1, and the first turn part When the coil pitch is X-1, the coil pitch of the second turn part may be X + 1.

  In the rotating electrical machine of the present invention, when the coil pitch of the first turn part and the second turn part on the other end side in the axial direction of the stator core is X, the coil pitch of the first turn part on the one end side is X + 2 and X-2 are alternately repeated in the circumferential direction, and when the coil pitch of the first turn portion is X + 2, the coil pitch of the second turn portion on the one end side is X-2, and the first turn portion When the coil pitch of the second turn portion is X-2, the coil pitch of the second turn portion may be X + 2.

  In the rotating electrical machine of the present invention, the coil may be composed of one or two windings.

  In the rotating electrical machine of the present invention, each of the first turn portion and the second turn portion includes a plurality of winding segments each having one coil end portion, and one end of the winding segment and the winding segment It is preferable that the other end of the other winding segment adjacent to is welded on the other end side in the axial direction of the stator core.

  In the rotating electrical machine according to the present invention, it is preferable that a protruding edge protruding in the circumferential direction toward another adjacent tooth is provided on the front side of the tooth.

  According to the present invention, since the turn change portion of the coil end portion is not twisted or inverted at one end side in the axial direction of the stator core, there is no small bending R, and the coil coating is not present. Can be hard to damage. Further, since the first and second turn portions constituting the coil overlap with each other in the axial direction at the coil end portion on one end side, the first rotating portion does not protrude by standing largely in the axial direction, and the entire rotating electric machine The height in the axial direction can be reduced.

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. The perspective view which shows the other end side of the axial direction of a stator. The perspective view which shows the coil for one phase wound by the wave. The perspective view which shows the coil | winding segment which comprises a coil. The schematic diagram for demonstrating the form of the wave winding of a coil. The schematic diagram which shows the principal part for demonstrating the form of wave winding. The schematic diagram which shows another principal part for demonstrating the form of wave winding.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 are a front view showing a stator 11 of a rotating electrical machine 10 according to the present embodiment, a perspective view showing one end side with respect to the axial direction of the axis C1, and a perspective view showing the other end side in the axial direction. is there.

[Outline of rotating electrical machine]
1 to 3, 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 rotate relative 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 formed by laminating a plurality of annular electromagnetic steel plates, and three-phase coils 13U, 13V, and 13W formed by conducting wires having a rectangular cross section wound around the stator core 12. Prepare. 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.

  In the drawings used in the description of the present embodiment, the numbers of the slots 15 are sequentially written in parentheses (parentheses). The same applies to the following description. In the following description, one end side of the axis C1 may be referred to as “upper side” and the other end side may be referred to as “lower side”.

  As shown in FIGS. 1 and 2, on one end side in the axial direction of the stator core 12, a plurality of conductive wires constituting the coils 13 </ b> U, 13 </ b> V, 13 </ b> W are overlapped in the axial direction like overlapping windings. The projecting dimension in the axial direction from 12A, that is, the height dimension of the coils 13U, 13V, 13W when the axial direction is the vertical direction is suppressed to H1.

  On the other hand, as shown in FIGS. 1 and 3, on the other end side of the stator core 12, a part of the plurality of conductive wires constituting the coils 13 </ b> U, 13 </ b> V, 13 </ b> W is projected in a single piece in the axial direction. Are formed in a straight line along the radial direction as 48 rows of welded parts corresponding to. The projecting dimensions of the coils 13U, 13V, and 13W from the other end face 12B of the stator core 12, that is, the height dimensions are set to H2 in consideration of workability in the welding process.

[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. FIG. 4 is a perspective view showing the coil 13U in a state where it is wound.

  In FIG. 4, the coil 13U is formed by making a total of four flat conductors U1, U2, U3, and U4 make two turns. More specifically, each of the rectangular conductive wires U1, U2, U3, U4 has a start end portion U1S, U2S, U3S, U4S and a terminal end portion U1E, U2E, U3E, U4E.

  Moreover, in the flat conducting wire U1, the conducting wire portion forming the first turn, that is, the conducting wire portion starting from the starting end portion U1S and returning to the starting end portion U1S is the first turn portion U11. A portion of the conductive wire that is continuous with the first turn portion U11, wound in the same direction as the first turn portion U11, and returns to the end portion U1E is a second turn portion U12. The same applies to the flat conductive wires U2, U3, U4. The flat conductive wires U2, U3, U4 have first turn portions U21, U31, U41 and second turn portions U22, U32, U42.

  At this time, as shown in FIG. 4, in the flat lead wires U1 and U2, the start end portions U1S and U2S and the end end portions U1E and U2E are arranged together and are positioned on a substantially straight line along the radial direction. Specifically, the starting end portion U1S of the flat conducting wire U1 is the outermost position in the radial direction, and the radial position (layer) in the slot 15 shown in FIGS. Will be located. Next, the terminal end portion U1E, the starting end portion U2S, and the terminal end portion U2E are sequentially positioned on the in-slot positions L3, L2, and L1.

[Description of winding path]
The winding path of such a flat conducting wire U1 will be described. First, the first turn portion U11 starting from the start end portion U1S is first extended a predetermined length in the counterclockwise direction along the circumferential direction, and bent downward in FIG. After entering the in-slot position L4 of the slot (1) from the upper end side, it exits from the other end side of the slot (1), and is then bent counterclockwise again to extend a predetermined length. Bend downward to form the welded portion described above.

  Then, the first turn portion U11 changes its position to the lower position in FIG. 4 of the in-slot position L3 through the welded portion, extends as it is for a predetermined length in the counterclockwise direction, is bent upward and is slotted ( After entering the in-slot position L3 of 7) from the lower end side, it exits from the upper end side of the slot (7). Thereafter, the first turn portion U11 extending in the counterclockwise direction extends to the slot (14), and the position thereof extends from the slot inner position L3 to the slot inner position while extending from the slot (7) to the slot (14). Returned to L4, bent downward, enters the slot (14) from the upper end side, and exits from the lower end side.

  Similarly, the first turn portion U11 is changed in position to the in-slot position L3 below, enters the slot (20) from the lower end side, exits from the upper end side, and enters the slot (25). Enter the position L4 from one end side, exit from the lower end side, enter the in-slot position L3 of the slot (31) from the lower end side, exit from the upper end side, and enter the in-slot position L4 of the slot (38) from the upper end side. It exits from the lower end side, enters the in-slot position L3 of the slot (44) from the lower end side, exits from the upper end side, and reaches the position of the start end portion U1S. Thereafter, the first turn part U11 is taken over as the second turn part U12.

  The second turn part U12 is wound in the same path as the first turn part U11, except that the inserted slot goes back and forth with respect to the first turn part U11, and reaches the end part U1E. That is, the inserted slot and the position in the slot are the position L3 in the slot (8), the position L4 in the slot (13), the position L3 in the slot (19), and the position L4 in the slot (26). In-slot position L3 of slot (32), in-slot position L4 of slot (37), and in-slot position L3 of slot (43).

  Here, the part which protruded from the one end side of the stator core 12 (FIG. 1, FIG. 2) in the 1st, 2nd turn part U11, U12 is comprised as a coil end part CE which mutually overlaps along an axial direction. .

  In the first and second turn portions U11 and U12, the coil end portion CE is located between the in-slot position L3 of the slot (7) and the in-slot position L4 of the slot (14) and between the in-slot position L3 and the slot of the slot (8). (13) In-slot position L4, In-slot position L3 in slot (19) and In-slot position L4 in slot (26), In-slot position L3 in slot (20) and In-slot position L4 in slot (25) In between, it appears between the in-slot position L3 of the slot (31) and the in-slot position L4 of the slot (38), and between the in-slot position L3 of the slot (32) and the in-slot position L4 of the slot (37).

  In such a coil end portion CE, the arrangement positions of both ends thereof are changed from the in-slot position L3 to the in-slot position L4. For this reason, the first and second turn portions U11 and U12 each have a turn change portion TC for changing the arrangement position in the slot 15 in the middle of the coil end portion CE. The turn change portion TC is a portion bent by a large bend R in a direction meandering with respect to the extending direction of the flat conducting wire U1, and does not have a steep bent portion that may damage the coating.

  In addition, the rectangular conductor U2 is the same as the rectangular conductor U1 in terms of the number of the inserted slot 15 and the position where the coil end portion CE is provided. However, the arrangement position by turn change in each slot 15 is the slot. It differs from the rectangular conducting wire U1 in that it is changed between the inner position L2 and the slot inner position L1.

  Further, regarding the rectangular conductors U3 and U4, in terms of the number of the inserted slot 15, the position change by turn change between the in-slot positions L3 and L4, and the position change by turn change between the in-slot positions L1 and L2. The same as the rectangular conductors U1 and U2, but the position where the coil end portion CE is provided is reversed from that of the rectangular conductors U1 and U2. That is, in the flat lead wires U3 and U4, between the slots (13) and (20), between the slots (14) and (19), between the slots (25) and (32), between the slots (26) and (31), the slot There is a coil end portion CE between (37) and (44) and between the slots (38) and (43).

  The rectangular conductive wires U1, U2, U3, U4 described above are connected as one winding. The terminal end U1E of the flat conducting wire U1 is connected to the starting end U2S of the flat conducting wire U2 located inside thereof. The terminal end U2E of the flat conducting wire U2 is connected to the terminal end U4E of the flat conducting wire U4 via a jumper wire JP (shown schematically in FIG. 6) having a predetermined shape. The starting end portion U4S of the flat conducting wire U4 is connected to the terminal end portion U3E of the flat conducting wire 3U located outside thereof.

  As a result, in the coil 13U, the rectangular conducting wires U1, U2, U3, U4 are connected in series, the starting end U1S of the rectangular conducting wire U1 serves as an input point, and the starting end U3S of the rectangular conducting wire U3 serves as an output point ( Neutral point). The starting end U3S, which is an output point (neutral point), is connected to the neutral point of the other coils 13V and 13W, and a four-turn single star connection is formed. Therefore, in the coil 13U, the current input to the starting end U1S first flows counterclockwise toward the terminal end U2E, and then input to the terminal end U4E and reverses the above toward the starting end U3S. Flows clockwise.

  Here, the jumper wire JP is a member that connects the end portions U2E and U4E having both ends at the same in-slot position L1, and thus may be a single-layer, arc-shaped simple member. However, the jumper wire may be a gate shape similar in shape to first and second winding segments 16 and 17 (FIG. 5) described later. Further, the connection between the terminal end portion U1E and the start end portion U2S and the connection between the start end portion U4S and the terminal end portion U3E are performed at the end portions that are close to each other in the radial direction, and thus a member such as a crossover is not necessary.

[Description of winding segments]
FIG. 5 is a perspective view of the first winding segment 16 and the second winding segment 17 that constitute each of the rectangular conductive wires U1, U2, U3, U4 of the coil 13U. By connecting the first and second winding segments 16 and 17 in the circumferential direction, the rectangular conductors U1, U2, U3, and U4 for two turns are formed.

  Note that the rectangular conductors U1, U3 and the rectangular conductors U2, U4 have slightly different lengths in the circumferential direction because the positions in the slots are different when inserted into the slots. However, in explaining the overall structure of the first and second winding segments 16 and 17, such a difference in length is not particularly problematic and is not questioned here.

  The first and second winding segments 16 and 17 have a substantially gate shape, and the upper part of the gate shape is a coil end portion CE. As is apparent from FIG. 1, the coil end portion CE has a shape that gently rises upward within the height dimension H1.

  The length in the circumferential direction of the coil end portion CE differs by two pitches as the coil pitch Pc of the slot 15 between the first and second winding segments 16 and 17. Is longer. In this embodiment, the length of the coil end portion CE of the first winding segment 16 is 7 pitches as the coil pitch Pc, as is apparent from the insertion slot number in FIG. The length of the coil end portion CE of the segment 17 is 5 pitches as the coil pitch Pc.

  Extending portions 16A, 17A extending in the circumferential direction are continuously provided at both ends of the gate-shaped portions of the first and second winding segments 16, 17, and end portions of the extending portions 16A, 17A. Are provided with bent portions 16B and 17B which are bent downward. The extending portions 16A and 17A have a coil pitch Pc of 3 pitches. The coil end portion CE is provided with a turn change portion TC, and the positions in the slots at both ends of the coil end portion CE are different. Therefore, between the lower ends of the gate-shaped portions, the rectangular conductive wires U1, U2, U3, A radial shift corresponding to the width dimension W1 of U4 occurs.

  In such first and second winding segments 16, 17, the second winding segment 17 is inserted into a predetermined slot so as to be located inside the first winding segment 16. The coil end portions CE and the extending portions 16A and 17A overlap in the axial direction (up and down) of the axis C1 (FIGS. 1 to 3). In particular, the coil end portion CE of the second winding segment 17 overlaps the first winding segment 16 in the entire area.

  Therefore, on the upper side of the stator core 12, when the first turn portions U11, U21, U31, U41 are positioned above the second turn portions U12, U22, U32, U42, the second turn portions U12, U22, U32, U42. The entire coil end portion CE overlaps with the coil end portions CE of the first turn portions U11, U21, U31, U41. On the contrary, when the second turn parts U12, U22, U32, U42 are positioned above the first turn parts U11, U21, U31, U41, the coil ends of the first turn parts U11, U21, U31, U41 The entire portion of the portion CE overlaps with the coil end portions CE of the second turn portions U12, U22, U32, and U42.

  In this way, the overlapping position of the coil end portion CE overlapping in the axial direction is such that the first turn portions U11, U21, U31, U41, and the second turn each time the coil end portion CE appears on one end side of the stator core 12 in the axial direction. The turn portions U12, U22, U32, and U42 are alternately switched.

  Further, as shown by a two-dot chain line in FIG. 5, with respect to the bent portion 16 </ b> B as the end portion of the first winding segment 16, the folding of the other second winding segment 17 adjacent in the circumferential direction is performed. The curved portions 17B are close to each other in the radial direction and are welded to each other. Similarly, with respect to the bent portion 17B of the second winding segment 17, the bent portion 16B of the other first winding segment 16 adjacent in the circumferential direction is close to the radial direction and welded together.

  At this time, on one side in the circumferential direction, the other first and second winding segments 16 and 17 adjacent to the first and second winding segments 16 and 17 are located on the radially inner side. On the other side in the circumferential direction, the first and second winding segments 16 and 17 and the other first and second winding segments 16 and 17 adjacent to the first and second winding segments 16 and 17 are positioned on the outer side in the radial direction and welded. Is done. As is apparent from FIG. 1, this welded portion appears as the height dimension H2 of the protruding portion from the stator core 12.

[Specific description of coil pitch]
FIG. 6 shows a schematic development view of the wave winding state of the U-phase coil 13U. In FIG. 6, NPc represents a coil pitch number. In the present embodiment, the coil pitch number NPc = 1 is set between the slots (1), (2) and the slots (7), (8), and the slots (7), (8) and the slots (13), The coil pitch number NPc = 2 is set between (14), the coil pitch number NPc = 3 is set between the slots (13), (14) and the slots (19), (20), and the slots (19), (20) and the slots are set. The coil pitch number NPc = 4 is set between (25) and (26), the coil pitch number NPc = 5 is set between the slots (25), (26) and the slots (31), (32), and the slots (31), ( 32) and between the slots (37) and (38), the coil pitch number NPc = 6, and between the slots (37) and (38) and the slots (43) and (44), the coil pitch number NPc = And then, the slot (43), and (44) and slot (1), (2) coils between the pitch number NPc = 8.

  In the following description, when n is a natural number, (2n-1) represents an odd number and (2n) represents an even number. Therefore, NPc (2n-1) means odd-numbered coil pitch numbers NPc = 1, 3, 5, and 7, and NPc (2n) means even-numbered coil pitch numbers NPc = 2, 4, and 7. 6 and 8.

  As is clear from FIG. 6, in the coil 13U of the present embodiment, the first turn portions U11 and U21 of the rectangular conductors U1 and U2 inserted into the different stator internal positions in the slot (1) are different in the stator internal positions. However, both of them are inserted into the slot (7) through the lower side of the stator core 12 (FIGS. 1 to 3). At this time, a portion passing through the lower side of the stator core 12 exists at a position where NPc = 1 as a coil pitch number, and an interval between the inserted slots 15 is Pc = 6 as a coil pitch. Further, the second turn portions U12 and U22 of the rectangular conductive wires U1 and U2 inserted through the slot (2) pass through the lower side of the stator core 12 and are inserted into the slot (8). The coil pitch number at this time is also NPc = 1, and the coil pitch is also Pc = 6.

  Next, the first turn portions U11 and U21 coming out from the upper side of the slot (7) pass through the upper side of the stator core 12 and are inserted into the slot (14). At this time, a portion passing through the upper side of the stator core 12 (corresponding to the coil end portion CE) exists at a position where NPc = 2 as a coil pitch number, and the coil pitch is Pc = 7. On the other hand, the second turn portions U12 and U22 coming out from the upper side of the slot (8) are inserted into the slot (13) through the upper side of the stator core 12. The coil pitch number at this time is also NPc = 2, but the coil pitch is Pc = 5.

  Then, the second turn portions U12 and U22 coming out from the lower side of the slot (13) are inserted into the slot (19) through the lower side of the stator core 12. At this time, the coil pitch number is NPc = 3, and the coil pitch is Pc = 6. Further, the first turn portions U11 and U21 coming out from the lower side of the slot (14) are inserted into the slot (20) through the lower side of the stator core 12. The coil pitch number at this time is also NPc = 3, and the coil pitch is also Pc = 6.

  Further, the second turn portions U12 and U22 coming out from the upper side of the slot (19) pass through the upper side of the stator core 12 and are inserted into the slot (26). At this time, the coil pitch number is NPc = 4 and the coil pitch is Pc = 7. On the other hand, the first turn portions U11 and U21 coming out from the upper side of the slot (20) pass through the upper side of the stator core 12 and are inserted into the slot (25). The coil pitch number at this time is also NPc = 4, but the coil pitch is Pc = 5.

  Thereafter, the above coil pitch Pc is repeated until the coil pitch number becomes NPc = 8. As a result, in all odd-numbered coil pitch numbers NPc = 1, 3, 5 and 7, the coil pitches of the first and second turn portions U11, U12, U21 and U22 appearing on the lower side of the stator core 12 are all Pc = 6.

  In all even-numbered coil pitch numbers NPc = 2, 4, 6 and 8, the coil pitches of the first and second turn portions U11, U12, U21 and U22 appearing on the upper side of the stator core 12 are the first turn portions U11. , U21 when Pc = 5, Pc = 7 at the second turn portions U21, U22, and Pc = 5 at the second turn portions U21, U22 when Pc = 7 at the first turn portions U11, U21. This is repeated alternately. That is, the coil pitch is repeated as Pc = 5, 7, 5, 7,..., Or is repeated as Pc = 7, 5, 7, 5,.

  Therefore, if the odd coil pitch is Pc (NPc (2n-1)) = X, the even coil pitch is Pc (NPc (2n)) = X-1, X + 1, X-1, X + 1. .. Is repeated or Pc (NPc (2n)) = X + 1, X-1, X + 1, X-1... Is repeated. Such deviation of the coil pitch Pc contributes to, for example, reducing the (X-1) th order and (X + 1) th order harmonics.

  By the way, in the lowermost stage of FIG. 6, the rectangular conducting wires U3 and U4 are indicated by two-dot chain lines. Such flat conducting wires U3 and U4 are in a positional relationship with the flat conducting wires U1 and U2 shown in the middle of each other. And when the 1st, 2nd turn part U11, U12, U21, U22 of the flat conducting wire U1, U2 is under the stator core 12, as shown in the upper stage of FIG. The second turn portions U31, U32, U41, U42 are on the upper side of the stator core 12, and the coil pitch is repeated as Pc = 5, 7, 5, 7,..., Or Pc = 7, 5, 7, 5 Repeat as follows.

  However, in the rectangular conductive wires U3 and U4, the coil pitch number NPc is defined between the slots (7) and (8) and the slots (13) and (14) because of the positional relationship between the start ends U3S and U4S and the end portions U3E and U4E. = 1, and the position of the coil pitch number is deviated from that of the flat conductive wires U1 and U2. Therefore, also in the rectangular conductors U3 and U4, if the odd coil pitch is Pc (NPc (2n-1)) = X, the even coil pitch is Pc (NPc (2n)) = X. −1, X + 1, X−1, X + 1... Or Pc (NPc (2n)) = X + 1, X−1, X + 1, X−1.

  The relationship between the flat conducting wires U1, U2 and the flat conducting wires U3, U4 will be described in more detail by enlarging a part thereof. FIG. 7 shows a winding state between the slots (37) and (38) and the slots (43) and (44). Between these, the 1st, 2nd turn part U11, U12, U21, U22 of the flat conducting wire U1, U2 exists in the lower side of the stator core 12. FIG. Then, on the lower side of the stator core 12, the first turn part U11 of the flat conducting wire U1 and the second turn part U22 of the flat conducting wire U2 are both between the slots (38) and (44), and the coil pitch is Pc = 6. . Similarly, the second turn portion U12 of the flat conducting wire U1 and the first turn portion U21 of the flat conducting wire U2 are both between the slots (37) and (43), and the coil pitch is Pc = 6.

  On the other hand, the first and second turn portions U31, U32, U41, U42 of the flat conductive wires U3, U4 are on the upper side of the stator core 12. On the upper side of the stator core 12, the first turn portion U31 of the flat conducting wire U3 and the first turn portion U41 of the flat conducting wire U4 are both between the slots (37) and (44), and the coil pitch is Pc = 7. On the other hand, the second turn portion U32 of the flat conducting wire U3 and the second turn portion U42 of the flat conducting wire U4 are both between the slots (38) and (43), and the coil pitch is Pc = 5.

  FIG. 8 shows a winding state between the slots (43) and (44) and the slots (1) and (2). Between these, contrary to FIG. 7, the first and second turn portions U <b> 11, U <b> 12, U <b> 21, U <b> 22 of the rectangular conductive wires U <b> 1, U <b> 2 are on the upper side of the stator core 12. Therefore, on the upper side of the stator core 12, both the first turn part U11 of the flat conductor U1 and the second turn part U22 of the flat conductor U2 are between the slots (44) and (1), and the coil pitch is Pc = 5. On the other hand, the second turn portion U12 of the flat conducting wire U1 and the second turn portion U21 of the flat conducting wire U2 are both between the slots (43) and (2), and the coil pitch is Pc = 7.

  On the other hand, the first and second turn portions U31, U32, U41, U42 of the rectangular conductive wires U3, U4 are on the lower side of the stator core 12. Then, on the lower side of the stator core 12, the first turn portion U31 of the flat rectangular wire U3 and the first turn portion U41 of the flat rectangular wire U4 are both between the slots (44) and (2), and the coil pitch is Pc = 6. . Similarly, both the second turn portion U32 of the flat conducting wire U3 and the second turn portion U42 of the flat conducting wire U4 are between the slots (43) and (1), and the coil pitch is Pc = 6.

  As described above, when the first and second turn portions U11, U12, U21, and U22 of the rectangular conductive wires U1 and U2 are below the stator core 12, the first and second turn portions U31 and U2 of the rectangular conductive wires U3 and U4, U <b> 32, U <b> 41 and U <b> 42 are on the upper side of the stator core 12. On the contrary, when the first and second turn portions U11, U12, U21, U22 of the flat conductors U1, U2 are on the upper side of the stator core 12, the first and second turn portions U31, U32, U41 of the flat conductors U3, U4. , U42 are on the lower side of the stator core 12.

[Other configurations]
As shown in FIG. 7, in the stator core 12 of the present embodiment, a protruding edge 14 </ b> B that protrudes in the circumferential direction toward another adjacent tooth 14 is provided at the tip of the tooth 14 of the stator core 12. The protruding edge 14B is provided continuously along the axial direction of the axis C1 (FIGS. 1 to 3), and prevents the coils 13U, 13V, and 13W from jumping out inward in the radial direction. By providing the protruding edge 14B, the slot 15 is a semi-closed type. In such a type, the tip surface 14A of the tooth 14 is expanded, so that the magnetic path is not narrowed and magnetic saturation is difficult.

  Further, as shown in FIG. 8, a groove portion 14 </ b> D along the axial direction is provided on the facing surface 14 </ b> C of the adjacent teeth 14. A plate-like edge member 18 is fitted between the opposing groove portions 14D to prevent the coils 13U, 13V, and 13W from jumping out inward in the radial direction.

  Although the stator core 12 shown in FIGS. 7 and 8 is originally of the same shape, it is drawn intentionally different here in order to explain variations in the shape of the tip side of the tooth 14.

[Effect of the embodiment]
According to the embodiment described above, since the turn change portion TC of the coil end portion CE is not twisted or reversed on the upper side in the axial direction of the stator core 12, there is no small bend R. Therefore, the coating of the coils 13U, 13V, and 13W can be hardly damaged. When the coil 13U is described as a representative, the first and second turn portions U11 and U12 constituting the flat conductive wire U1 of the coil 13U, the first and second turn portions U21 and U22 constituting the flat conductive wire U2, The first and second turn portions U31 and U32 constituting the conducting wire U3 and the first and second turn portions U41 and U42 constituting the flat conducting wire U4 overlap each other in the axial direction at the coil end portion CE. Therefore, it does not protrude by standing up in the axial direction, and the height dimension on the upper side can be suppressed to H1, so that the overall height of the rotating electrical machine 10 can be reduced.

  Furthermore, by suppressing the height H1, the length of the conductive wire forming the coil end portion CE may be short, the resistance is reduced, the copper loss is reduced, and the energy conversion efficiency to the mechanical output with respect to the input power is improved. Can be improved. In addition, since one end side of the stator core 12 is compact, the case for housing the stator 11 can be made small, and the weight of the coils 13U, 13V, 13W can be reduced.

  In addition, on the upper side of the stator core 12, the coil pitch of the coil end portion CE is alternately shifted as Pc = 7, 5, 7, 5,..., So that the induced electromotive force can be brought close to a sine wave. The fifth and seventh harmonics can be reduced. Therefore, torque ripple is reduced, and there is an effect that noise can be reduced.

[Modification]
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-described 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.

  Furthermore, as a suitable combination of the number of turns and the connection form, the number of flat conductors (corresponding to the number of turns) is 4, 6, 8, 10 to form a single star connection, or 8, 12 Double star connections may be formed as 16, 16, and 20, or triple star connections may be formed as 12, 18, 24, and 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 the above embodiment, when the odd-numbered coil pitch is Pc (NPc (2n-1)) = X, the even-numbered coil pitch is Pc (NPc (2n)) = X-1, X + 1, X-1, It has been described that X + 1... Is repeated or Pc (NPc (2n)) = X + 1, X-1, X + 1, X-1..., But for example, Pc (NPc (2n)) = X− 2, X + 2, X-2, X + 2... Or Pc (NPc (2n)) = X + 2, X-2, X + 2, X-2.

  Specifically, if the odd-numbered coil pitch is Pc (NPc (2n-1)) = 6, the even-numbered coil pitch is Pc (NPc (2n)) = 4, 8, 4, 8,. May be repeated or Pc (NPc (2n)) = 8, 4, 8, 4,... May be repeated.

  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.

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

  DESCRIPTION OF SYMBOLS 10 ... Rotating electrical machine, 12 ... Stator core, 13U, 13V, 13W ... Coil, 14 ... Teeth, 14A ... Tip surface, 14B ... Projection edge, 14C ... Opposing surface, 14D ... Groove, 15 ... Slot, 16, 17 ... Winding Segment, 16B, 17B ... bent portion (end portion), CE ... coil end portion, Pc ... coil pitch, TC ... turn change portion, U11, U21, U31, U41 ... first turn portion, U12, U22, U32, U42 ... 2nd turn part.

Claims (7)

An annular stator core having a plurality of teeth and a plurality of slots alternately formed in the circumferential direction;
The stator core has at least two turns having a first turn part and a second turn part, and the first turn part and the second turn part are wave-wound at a circumferential coil pitch that is regularly changed to the slots. A coil formed of a conducting wire having a rectangular cross section,
On one end side in the axial direction of the stator core,
Each of the first turn part and the second turn part has a turn change part for changing the arrangement position in the radial direction in the slot in the middle of the coil end part from the slot wound to another slot. And
One of said 1st turn part and 2nd turn part has overlapped in the said axial direction over the whole region of the said coil end part with respect to the other. The rotary electric machine characterized by the above-mentioned. In the rotating electrical machine according to claim 1,
The overlapping positional relationship between the coil end portions of the first turn portion and the second turn portion that overlap in the axial direction is such that the coil end portion and the first turn portion and the second turn portion overlap each other on the one end side in the axial direction of the stator core. A rotating electrical machine characterized by being alternately replaced in two turns. In the rotating electrical machine according to claim 1 or 2,
When the coil pitch of the first turn part and the second turn part on the other end side in the axial direction of the stator core is X, the coil pitch of the first turn part on the one end side is around X + 1 and X-1. When the coil pitch of the first turn part is X + 1, the coil pitch of the second turn part on the one end side is X-1, and the coil pitch of the first turn part is X-1. In this case, the coil pitch of the second turn part is X + 1. In the rotating electrical machine according to claim 1 or 2,
If the coil pitch of the first turn part and the second turn part on the other end side in the axial direction of the stator core is X, the coil pitch of the first turn part on the one end side will circulate around X + 2 and X-2. When the coil pitch of the first turn part is X + 2, the coil pitch of the second turn part on the one end side is X-2, and the coil pitch of the first turn part is X-2. In this case, the coil pitch of the second turn portion is X + 2. In the rotating electrical machine according to any one of claims 1 to 4,
The rotating electric machine is characterized in that the coil is composed of one or two windings. In the rotating electrical machine according to any one of claims 1 to 5,
Each of the first turn part and the second turn part includes a plurality of winding segments each having one coil end part,
One end of the said winding segment and the other end of the other winding segment adjacent to the said winding segment are welded by the other end side of the axial direction of the said stator core. The rotary electric machine characterized by the above-mentioned. The rotating electrical machine according to any one of claims 1 to 6,
A rotating electric machine characterized in that a protruding edge protruding in the circumferential direction toward another adjacent tooth is provided on the front side of the tooth.

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