JP2012222963A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict generation of a cyclic current between wire connections connected in parallel in a rotary electric machine stator of double star connection distributed winding type.SOLUTION: A stator winding of a rotary electric machine is a double star distributed winding configured by connecting a first distributed winding part, which is formed by serially connecting and arranging n unit coils formed by winding coil strands at a prescribed unit coil interval, and a second distributed winding part, which is formed by serially connecting and arranging n unit coils using slots separated from the first distributed winding part by a prescribed slot interval, in parallel. A rotor 30 has a first rotor part 32, which is a half region at one end side along the axial direction, and a second rotor part 34, which is a half region at the other end side. A magnetic pole center position of the first rotor part 32 is different from a magnetic pole center position of the second rotor position 34 by a distance in a peripheral direction corresponding to the prescribed slot interval.

Description

  The present invention relates to a rotating electrical machine, and more particularly, to a rotating electrical machine using a rotating electrical machine stator in which the connection of each phase coil is a double star connection.

  As a method for arranging stator windings in a three-phase rotating electrical machine, one end of each phase winding is used as a power line terminal connected to a drive circuit such as an inverter, and the other end of each phase winding is connected to each other. Star connection is known as a neutral point terminal. Also, a double star connection is known in which two windings are connected in parallel between a power line terminal and a neutral point terminal for each phase winding of the star connection.

  Patent Document 1 describes that, as a winding method of the stator iron core, the applied voltage when driving the motor can be lowered by making the connection of each phase coil a double star connection. Here, for example, as a U-phase winding, one U-phase winding and the other U-phase winding are arranged in the same slot, and these U-phase windings are connected in parallel. It is disclosed that the wire is also composed of four U-phase coils each connected in series in the circumferential direction of the stator.

  In Patent Document 2, in a segment sequential joining stator coil type rotating electrical machine, a plurality of partial coils connected in series in one slot is a radial series coil, and three radial series coils are arranged in different slots. Thus, a configuration in which they are connected in parallel, that is, a configuration in the radial series and the circumferential parallel is described. In this case, since the electromotive forces of the three radially connected series coils connected in parallel are mutually shifted in phase by the slot interval, the difference in the electromotive force is generated between the three radially connected series coils connected in parallel. Current flows. Therefore, the partial coil whose phase is advanced and the partial coil whose phase is delayed are arranged in different slots, but the radial series coil is formed by combining the partial coil whose phase is advanced and the partial coil whose phase is delayed across the slots. A series connection is disclosed.

JP 2005-12974 A Japanese Patent No. 38156774

  In Patent Document 2, it is pointed out that a circulating current is generated between three radial series coils connected in parallel with different slots in a stator winding. In patent document 2, it is the circumferential direction parallel connection and radial direction serial connection. Double star connection using distributed winding is in series in the circumferential direction and parallel in the radial direction. However, if the slots are different in the radial direction, it is expected that a circulating current will be generated.

  The objective of this invention is providing the rotary electric machine which can suppress generation | occurrence | production of the circulating current between the connections connected in parallel in the double star connection using distributed winding.

  A rotating electrical machine according to the present invention includes a stator core that is arranged along a circumferential direction and that has a plurality of slots each extending in a radial direction, and windings a coil wire at a unit coil interval with a predetermined slot interval as a unit coil interval. The coil formed by rotating is defined as a unit coil, and a first distributed winding portion formed by connecting n unit coils in series in one circumferential circumference of the stator core and a first distributed winding portion are predetermined. A second distributed winding portion formed by connecting n unit coils in series on one circumference in the circumferential direction of the stator core is connected in parallel using different slots separated by a predetermined slot interval. A rotor having each phase winding of a distributed winding, a first rotor portion that is a half region on one end side along the axial direction, and a second rotor portion that is a half region on the other end side. The first rotor part Magnetic pole center along the circumferential position and the magnetic pole center position along the circumferential direction of the second rotor portion, characterized in that and a only differs rotor circumferential distance corresponding to the predetermined slot interval.

  In the rotating electrical machine according to the present invention, the first distributed winding portion has a unit coil interval of 6 slots, and has one winding end slot and the other winding start slot of adjacent unit coils in common, and the circumference of the stator core. The second distributed winding portion is formed by connecting and arranging in series on one circumference of the direction. The second distributed winding portion uses a slot adjacent to the slot used in the first distributed winding portion, and ends one winding of the adjacent unit coil. The slot and the other winding start slot are made common and formed by connecting and arranging in series in the circumferential direction of the stator core, and the magnetic pole center position along the circumferential direction of the first rotor portion and the second rotor portion The magnetic pole center position along the circumferential direction is preferably different by a circumferential distance corresponding to one slot interval in the circumferential direction of the stator core.

  With the above configuration, the distributed winding phase windings of the stator in the rotating electrical machine are each arranged in a double star connection in which the first distributed winding portion and the second distributed winding portion are connected in parallel. Here, the second distributed winding portion uses a slot used for the second distributed winding portion and a different slot that is separated by a predetermined slot interval. The rotor has a first rotor portion that is a half region on one end side along the axial direction and a second rotor portion that is a half region on the other end side, and the circumferential direction of the first rotor portion And the center position of the magnetic pole along the circumferential direction of the second rotor portion at a predetermined slot interval between the first distributed winding portion and the second distributed winding portion of each phase winding of the distributed winding. Only the corresponding circumferential distance is different. Accordingly, the interlinkage magnetic flux of each unit coil constituting the first distributed winding portion, and the interlinkage magnetic flux of each unit coil constituting the second distributed winding portion that is separated by a predetermined slot interval corresponding to this, Can be the same. Therefore, when the rotating electrical machine operates, no voltage difference is generated between the first distributed winding portion and the second distributed winding portion, and no circulating current is generated.

  In the rotating electrical machine, when the slot adjacent to the slot used in the first distributed winding portion is used as the second distributed winding portion, the magnetic pole center position along the circumferential direction of the first rotor portion and the second rotor The center position of the magnetic pole along the circumferential direction of the portion may be varied by a circumferential distance corresponding to the one-slot interval in the circumferential direction of the stator core. Thereby, the interlinkage magnetic flux of each unit coil constituting the first distributed winding portion can be made the same as the interlinkage magnetic flux of the unit coil of the second distributed winding portion corresponding thereto.

It is a figure explaining the star connection and double star connection in the stator of the rotary electric machine using distributed winding. In the stator of the rotating electrical machine according to the embodiment of the present invention, the state of the arrangement of each phase winding of the distributed winding that is double-star connected will be described using the U-phase distributed winding as a representative. It is a figure which extracts and demonstrates the U-phase distributed winding in FIG. It is a figure explaining the structure of the rotor of the rotary electric machine of embodiment which concerns on this invention. In the stator of the rotating electrical machine according to the embodiment of the present invention, a circulating current is expected to be generated, but it is one of two winding portions connected in parallel with a basic U-phase distributed winding. It is a figure explaining the mode of arrangement of the 1st distributed winding part. It is a figure explaining the mode of arrangement | positioning of the 2nd distributed winding part connected in parallel with the 1st distributed winding part of FIG. FIG. 5 is a diagram schematically illustrating a state of arrangement of a basic U-phase distributed winding in the stator of the rotating electrical machine according to the embodiment of the present invention by putting FIG. 5 and FIG. 6 together. It is a figure explaining a mode that a circulating current generate | occur | produces between the U1 coil and U2 coil which are connected in parallel using the equivalent circuit schematic with respect to FIG. In FIG. 7, it is a figure explaining the mode of the phase voltage based on the electromotive force which generate | occur | produces in each coil, when a rotary electric machine operate | moves. In the rotating electrical machine according to the embodiment of the present invention, a schematic diagram explaining that the interlinkage magnetic flux of the unit coil of the first distributed winding portion and the interlinkage magnetic flux of the unit coil of the second distributed winding portion are the same. FIG. It is a schematic diagram explaining that the interlinkage magnetic flux of the unit coil of the first distributed winding portion is different from the interlinkage magnetic flux of the unit coil of the second distributed winding portion when the conventional rotor is used. In the rotating electrical machine according to the embodiment of the present invention, the state of the voltage of the first distributed winding section and the voltage of the second distributed winding section generated by the first rotor section when the rotating electrical machine operates is a diagram illustrating the state of the voltage of the second distributed winding section. . FIG. 13 is a diagram for explaining the state of the voltage of the first distributed winding section and the voltage of the second distributed winding section generated by the first rotor section, corresponding to FIG. 12.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, a three-phase synchronous rotating electric machine mounted on a vehicle will be described as the rotating electric machine, but may be used other than mounting on the vehicle. Hereinafter, a three-phase synchronous rotating electric machine will be described as the rotating electric machine stator. However, the stator may be a stator including distributed winding coils, and is not limited to three-phase. In the following description, the stator has 48 slots, and each phase winding is composed of 16 unit coils. However, the number of unit coils constituting each phase winding may be other than this. The number of slots may be set accordingly. In the following description, each unit coil is described as being wound five times, but of course this is merely an example, and other numbers of turns may be used.

  In the following description, the rotor is described as a permanent magnet type, but may be a reluctance type rotor. For example, a rotor having salient poles may be used. In this case, the magnetic pole center can be determined by the configuration of the reluctance motor. As the permanent magnet type, a surface permanent magnet type will be described, but an embedded permanent magnet type may be used. Further, although the slot difference between the unit coil C1 and the unit coil C9 is one slot, this is an example, and it is not necessarily one slot difference, and may be a predetermined slot difference. In that case, the difference between the magnetic pole center position of the first rotor portion and the magnetic pole center position of the second rotor portion is a size corresponding to the predetermined slot difference.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

First, double star connection will be described. FIGS. 1A and 1B are diagrams for explaining a connection state of each phase winding in a stator of a three-phase synchronous rotating electric machine, where FIG. 1A is a star connection and FIG. 1B is a double star connection. In the star connection, one end of each phase winding U-phase winding, V-phase winding, and W-phase winding is connected to a drive circuit such as an inverter, and power line terminals P _U , P _V , P _W Each other end is connected to a neutral point terminal N. In star connection using distributed windings for each phase winding, each phase winding is a series connection of a plurality of coils. In the star connection of FIG. 1A, each phase winding is shown as a series connection of a plurality of resistance elements because the resistance component of the coil is illustrated, and each resistance element represents a coil. .

In the double star connection, two windings are connected in parallel between the power line terminals P _U , P _V , and P _W and the neutral point terminal N for each phase winding of the star connection. For example, in the U-phase winding of FIG. 1B, U1 and U2 are connected in parallel between the power line terminal P _U and the neutral point terminal N. U1 and U2 are each configured by connecting a plurality of coils in series. Double star connection is used, for example, when it is desired to increase the maximum current that can be passed through the stator of a rotating electrical machine. As an example, when it is desired to double the maximum current of the stator of the rotating electrical machine, if the current density passed through the coil conductor wire is the same, the coil conductor diameter must be doubled. In this case, since a thick conductor wire is used, eddy current loss increases and the workability of the winding decreases. If double star connection is used, it is sufficient to prepare two sets of coils having the same conductor diameter, so that eddy current loss can be suppressed and the workability of the coil can be maintained as it is.

  FIGS. 2 to 4 are diagrams for explaining the state of the rotating electrical machine stator 10 and the rotor 30 that constitute a three-phase synchronous rotating electrical machine mounted on a vehicle. 2 and 3 show the rotating electrical machine stator 10, and FIG. 4 is a diagram showing the rotor 30 that is coaxially disposed at the center of the rotating electrical machine stator 10.

  The rotating electrical machine stator 10 includes a stator core 12 in which a plurality of annular electromagnetic steel plates are stacked, and a distributed three-phase winding wound around the stator core 12. FIG. 2 shows the U-phase wiring of the distributed winding that is one phase of the three-phase windings of the distributed winding. Hereinafter, the U-phase wiring of the distributed winding is referred to as the U-phase distributed winding 20. The slot 14 is a groove that opens on the inner peripheral side of the annular shape of the stator core 12, extends in the radial direction, and is arranged in a plurality in the circumferential direction, and each phase winding is arranged in a distributed winding form here. In FIG. 2, 48 slots 14 are arranged along the circumferential direction of the stator core 12, and U-phase distributed windings 20 are arranged in 16 of them.

  FIG. 3 is a diagram showing the U-phase distributed winding 20 extracted from the rotating electrical machine stator 10. The U-phase distributed winding 20 is configured by arranging 16 unit coils 21 each having a coil wire, which is a conductor wire, wound in a substantially hexagonal shape along the circumferential direction of the stator core 12. In FIG. 3, C1 to C16 are coil numbers for distinguishing the 16 unit coils 21.

  As can be seen from FIG. 3, the unit coil C2 is disposed immediately adjacent to the unit coil C1, and is subsequently disposed adjacent to C3, C4, C5, C6, C7, and C8, and makes one round in the circumferential direction. Further, the unit coil C10 is disposed immediately adjacent to the unit coil C9, and is subsequently disposed next to C11, C12, C13, C14, C15, and C16 in order, and makes one round in the circumferential direction.

  As shown in FIG. 2, each unit coil is wound between two slots 14 arranged at an interval of 6 slots.

  The slot 14 on the other side where the unit coil C1 is arranged and the slot 14 on the one side where the unit coil C2 is arranged are the same slot 14. Similarly, between the unit coils C2 to C8, the coil number is i, the other slot 14 where the i-th coil is arranged, and the one slot 14 where the (i + 1) -th coil is arranged are the same slot 14. It is. Similarly, between the unit coils C9 to C16, with the coil number i, the slot 14 on the other side where the i-th coil is arranged and the slot 14 on the one side where the (i + 1) -th coil is arranged are the same slot 14 It is.

  Further, as shown in FIG. 2, the unit coil C1 and the unit coil C9 are shifted by one slot. Similarly, assuming that the coil number is i, the i-th coil and the (i + 8) -th coil are shifted by one slot.

  Here, eight unit coils C1, C2, C3, C4, C5, C6, C7, and C8 are sequentially connected in series to form the U1 coil described in FIG. 1, and unit coils C9, C10, C11, C12, and C13 are used. , C14, C15, and C16 can be sequentially connected in series to form the U2 coil described in FIG. In this case, each unit coil constituting the U1 coil and each unit coil constituting the U2 coil are shifted by one slot. Therefore, when the rotating electrical machine operates, as will be described in detail later, A circulating current is generated between the U2 coils.

  FIG. 4 is a diagram illustrating the rotor 30 having a configuration that suppresses the generation of circulating current. Here, a perspective view of the rotor 30 arranged with the axial direction as the vertical direction of the paper surface, a bottom view showing one end side of the rotor 30 in the axial direction, and a top view showing the other end side are shown. Although the XYZ direction is shown in FIG. 4, the Z direction is the axial direction. The rotor 30 has eight permanent magnet type magnetic poles. In FIG. 4, N and S magnetic pole regions are shown as N and S, respectively. The eight N and S magnetic poles correspond to eight unit coils C1 to C8 of the rotating electrical machine stator 10 or eight unit coils C9 to C16.

Unlike the normally used rotor structure, the rotor 30 includes a first rotor portion 32 that is a half region on one end side and a second rotor portion 34 that is a half region on the other end side along the axial direction. Have. The eight N and S magnetic poles of the first rotor portion 32 correspond to the eight unit coils C1 to C8 of the rotating electrical machine stator 10. The eight N and S magnetic poles of the second rotor portion 34 correspond to the eight unit coils C9 to C16 of the rotating electrical machine stator 10. In response to this response, the first
The magnetic pole center position along the circumferential direction of the rotor part 32 and the magnetic pole center position along the circumferential direction of the second rotor part 34 are shifted by ΔP. This ΔP is one slot which is an arrangement difference between the unit coil C1 and the unit coil C9.

  Thus, by shifting the magnetic pole center position of the first rotor part 32 and the magnetic pole center position of the second rotor part 34 by ΔP = 1 slot, the circulating current that can be generated when the rotating electrical machine operates can be suppressed. Before the explanation, it is explained that a circulating current can be generated in the case of a normal rotor structure, that is, a rotor structure in which eight magnetic poles are formed uniformly along the axial direction and ΔP = 0. To do.

In the double star connection of the U-phase distributed winding 20, the C1 to C8 unit coils 21 are connected in series, and the C9 to C16 unit coils 21 are connected in series. Here, a unit in which unit coils 21 of C1 to C8 are connected in series is referred to as a first distributed winding unit U1, and a unit in which unit coils 21 of C9 to C16 are connected in series is a second distributed winding unit. Call it U2. The U-phase distributed winding 20 is formed by connecting the first distributed winding portion U1 and the second distributed winding portion U2 in parallel between the power line terminal P _U and the neutral point terminal N.

  FIG. 5 is a schematic diagram showing a state of winding of the unit coil 21 in the first distributed winding part U1, and FIG. 6 is a schematic diagram showing a state of winding of the unit coil 21 in the second distributed winding part U2. It is.

  Here, a plan view of the stator core 12 and a state of connection between the unit coils 21 are schematically shown on the outside thereof. The 48 slots 14 of the stator core 12 are given slot numbers for distinguishing them within a range necessary for explanation. The slot numbers given to the stator cores 12 in FIGS. 5 and 6 are only numbers 1 to 48 because there is little space to describe, but in the following, the slot numbers are S1 to S48 and S. A description will be given with symbols. Note that the slot numbering method described below is an example, and of course, other numbering methods may be used. In the following, the symbol 14 of the slot 14 is omitted as appropriate in order to avoid confusion with the slot number. Similarly, the symbol 21 of the unit coil 21 is omitted as appropriate to avoid being confused with the unit coil number.

  In the case of distributed winding, the coil wire 23 is arranged across a predetermined slot interval. This predetermined slot interval defines the hexagonal outer shape of the unit coil 21 and will be referred to as a unit coil interval 26. 5 and 6, the unit coil interval 26 is an interval of 6 slots. That is, one unit coil 21 is formed by winding the coil wire 23 five times over the 6-slot interval which is the unit coil interval 26.

In FIG. 5, the unit coil C1 is a unit coil at the start of winding of the first distributed winding portion U1. Since the start of winding of the first distributed winding portion U1 is connected to the power line terminal P _U , the start of winding of the unit coil C1 is shown as P _U in FIG.

  In the winding start unit coil C1, the coil wire 23 is wound 5 times between the slot S4 and the slot S10. The winding start of the unit coil C1 is on the outer peripheral side of the stator core 12 in the slot S4. If the front side of the paper surface of FIG. 5 is the front side of the stator core 12 and the back side of the paper surface of FIG. 5 is the back side of the stator core 12, the coil wire 23 descends from the position of the slot S4 at the start of winding of the unit coil C1 to the back side of the stator core 12. On the back side of the stator core 12, the unit coil interval 26 extends from the slot S4 to the slot S10.

  Then, the slot S10 rises from the back side of the stator core 12 to the front side, and crosses the unit coil interval 26 from the slot S10 to the slot S4 on the front side of the stator core 12. In the slot S4, the stator core 12 again falls from the front side to the back side. Then, on the back side of the stator core 12, the unit coil interval is shifted from the slot S4 to the slot S10 by shifting the position to the inner peripheral side of the stator core 12 so as not to overlap the coil wire 23 extending from the slot S4 to the slot S10. Cross 26.

  In the slot S10, it rises again from the back side of the stator core 12 to the front side. Then, on the front side of the stator core 12, the unit coil interval is shifted from the slot S10 to the slot S4 by shifting the position to the inner peripheral side of the stator core 12 so as not to overlap with the coil wire 23 extending from the slot S10 to the slot S4. Cross 26.

  By repeating this, the coil wire 23 is wound five times between the slot S4 and the slot S10, and the formation of the unit coil C1 is completed. That is, when viewed from the inner peripheral side of the stator core 12, the unit coil C1 is formed by winding the coil wire 23 counterclockwise five times.

  The end of winding of the unit coil C1 is the innermost side of the stator core 12 and the back side. The coil wire 23 crosses the innermost peripheral side of the stator core 12 from the slot S4 to the slot S10 by a unit coil interval, goes up the slot S10, exits to the front side of the stator core 12, and starts winding the unit coil C2. In this way, the unit coil C1 and the unit coil C2 are adjacently connected with the slot S10 being common. In FIG. 5, in order to easily understand the connection between the unit coils, the winding direction of the coil wire 23 is indicated by a black dot mark and an X mark in a circle. A black dot mark indicates a case where the coil wire 23 goes out from the front side of the stator core 12 to the back side, and an X mark shows a case where the coil wire 23 goes out from the back side of the stator core 12 to the front side.

  The unit coil C2 extends from the slot S10 to the slot S16 by the unit coil interval 26 on the front side of the stator core 12 from the beginning of winding. After crossing the slot S16, the slot descends from the front side of the stator core 12 to the back side in the slot S16, and crosses the unit coil interval 26 from the slot S16 to the slot S10 on the back side of the stator core 12. In the slot S10, it rises again from the back side of the stator core 12 to the front side. Then, on the front side of the stator core 12, the unit coil interval 26 is shifted from the slot S10 to the slot S16 by shifting the position to the outer peripheral side of the stator core 12 so as not to overlap with the coil wire 23 extending from the slot S10 to the slot S16. Just cross.

  In the slot S16, the stator core 12 again falls from the front side to the back side. Then, on the back side of the stator core 12, the unit coil interval 26 is shifted from the slot S16 to the slot S10 by shifting the position to the outer peripheral side of the stator core 12 so as not to overlap with the coil wire 23 extending from the slot S16 to the slot S10. Just cross.

  By repeating this, the coil wire 23 is wound five times between the slot S10 and the slot S16, and the formation of the unit coil C2 is completed. That is, when viewed from the inner peripheral side of the stator core 12, the unit coil C2 is formed by winding the coil wire 23 in the clockwise direction five times unlike the unit coil C1.

  Thereafter, similar winding is repeated for the unit coil C3 to the unit coil C8. As for winding, the unit coil C3, the unit coil C5, and the unit coil C7 are the same counterclockwise direction as the unit coil C1, and the unit coil C4, the unit coil C6, and the unit coil C8 are the same clockwise direction as the unit coil C2. The end of winding of the unit coil C8 comes out from the slot S46 to the front side on the outermost peripheral side of the stator core 12, and this is connected to the neutral point terminal N. In this way, the formation of the first distributed winding portion U1 is completed.

FIG. 6 is a diagram illustrating the winding order of the second distributed winding portion U2. Here, as in FIG. 5, the power line terminal P _U is the start of winding of the unit coil C9. The unit coil C9 is shifted by one slot from the unit coil C1, and the coil wire 23 is wound five times between the slot S3 and the slot S9. The winding method is counterclockwise as in the unit coil C1 of the first distributed winding portion U1. The end of winding of the unit coil C9 is the innermost side of the stator core 12 and the back side. The coil wire 23 crosses the innermost circumferential side of the stator core 12 from the slot S3 to the slot S9 by a unit coil interval, goes up the slot S9, exits to the front side of the stator core 12, and starts winding the unit coil C10. In this way, the unit coil C9 and the unit coil C10 are adjacently connected.

Thereafter, a procedure similar to that described with reference to FIG. 5 is performed while being shifted by one slot, and similar winding is repeated from the unit coil C10 to the unit coil C16. Then, the end of winding of the unit coil C16 comes out from the slot S45 to the front side on the outermost peripheral side of the stator core 12. This is the end of winding of the second distributed winding portion U2, and is connected to the neutral point terminal N.
As described above, the unit coil interval is set to 6 slots, and the first distributed winding portion U1 has one winding end slot and the other winding start slot of the adjacent unit coils in common, and makes one turn in the circumferential direction of the stator core. Eight are connected and arranged in series. Further, the second distributed winding portion U2 uses a slot adjacent to the slot used in the first distributed winding portion U1, and uses one winding end slot and the other winding start slot of adjacent unit coils in common, Eight are connected and arranged in series on one circumference in the circumferential direction of the stator core.

  FIG. 7 is a diagram schematically illustrating the arrangement of the unit coils 21 in the U-phase distributed winding 20 together with FIGS. 5 and 6. Here, on the inner peripheral side of the slot 14 in the stator core 12, the unit coil C1 to the unit coil C8 of the first distributed winding portion U1 are indicated by solid lines. Further, the unit coil C9 to the unit coil C16 of the second distributed winding portion U2 are indicated by broken lines on the outer peripheral side of the slot 14, respectively.

  Each of the eight unit coils constituting the first distributed winding part U1 is arranged so as to be shifted from the corresponding unit coil of the eight second distributed winding parts U2 by one slot interval. Assuming that a rotor having a normal structure in which magnetic poles are arranged along the circumferential direction is used, the deviation of the one-slot interval is a unit of the first distributed winding unit U1 by the magnetic poles of the rotor when the rotating electrical machine operates. A difference is generated between the electromotive force generated in the coil and the electromotive force generated in the unit coil of the second distributed winding portion U2. Specifically, the electromotive force generation timing is shifted by one slot. If the electromotive force varies depending on the electrical angle, a difference in electromotive force is generated between the corresponding unit coil 21 of the first distributed winding portion U1 and the unit coil 21 of the second distributed winding portion U2.

FIG. 8 is an equivalent circuit diagram of the U-phase distributed winding 20. As described above, the U-phase distributed winding 20 includes the first distributed winding portion U1 in which the unit coil C1 to the unit coil C8 are connected in series, and the second distributed winding in which the unit coil C9 to the unit coil C16 are connected in series. The line portion U2 is connected in parallel between the power line terminal P _U and the neutral point terminal N. Each unit coil constituting the first distributed winding portion U1 and each unit coil constituting the second distributed winding portion U2 are arranged so as to be shifted from each other by one slot interval. Therefore, a voltage difference is generated between the first distributed winding portion U1 and the second distributed winding portion U2 due to a difference in electromotive force generated when the rotating electrical machine operates. Then, due to the voltage difference, a circulating current is generated between the first distributed winding portion U1 and the second distributed winding portion U2 as shown by the arrows in FIG.

FIG. 9 is a diagram showing the relationship between the electrical angle of the rotating electrical machine and the interphase voltage of the U-phase distributed winding 20. The interphase voltage, the voltage between the P _U and N of the first distribution winding unit U1, the voltage between the P _U and N of the second distributed winding unit U2, and the voltage difference between these is shown Yes. This voltage difference is a voltage difference that causes a circulating current. The voltage difference varies depending on the electrical angle, and includes a positive voltage difference and a negative voltage difference. The direction of the arrow of the circulating current in FIG. 8 is when the voltage of the second distributed winding portion U2 is higher than the voltage of the first distributed winding portion U1.

  As described above, the configuration of the U-phase distributed winding 20 and the generation of the circulating current in the configuration have been described. Next, it will be described that the circulating current can be suppressed by the rotor 30 having the configuration described in FIG. .

  For comparison, FIG. 10 shows a unit coil of the first distributed winding portion U1 when a rotor having a conventional structure, that is, a rotor having a uniform magnetic pole in the axial direction and ΔP = 0 is used. It is a figure explaining the state of the interlinkage magnetic flux and the interlinkage magnetic flux in the unit coil of the 2nd distributed winding part U2. The middle diagram of FIG. 10 is a diagram showing a part of a rotor 36 having a conventional structure. The upper stage and the lower stage of FIG. 10 show a state where the center position of the unit coil C9 of the second distributed winding portion U2 matches the center position of the N pole of the rotor 36. This state corresponds to the electrical angle described with reference to FIG. 9 being 90 ° or 270 °.

  At this time, the center position of the unit coil C1 of the first distributed winding portion U1 is shifted by one slot from the center position of the unit coil C9 of the second distributed winding portion U2. The deviation of one slot is the same as ΔP, which is the difference between the magnetic pole center position of the first rotor portion 32 and the magnetic pole center position of the second rotor portion 34 of the rotor 30 described in FIG. Therefore, in FIG. 10, this one-slot shift is shown as ΔP for easy comparison with the rotor 30.

  As can be seen from FIG. 10, the flux linkage from the N pole for the unit coil C <b> 9 of the second distributed winding portion U <b> 2 is a portion from the entire N pole region of the rotor 36. On the other hand, the flux linkage from the N pole for the unit coil C1 of the first distributed winding portion U1 is a value obtained by subtracting ΔP from the entire N pole region of the rotor 36. That is, the flux linkage from the N pole for the unit coil C1 of the first distributed winding portion U1 is less than the flux linkage from the N pole for the unit coil C9 of the second distributed winding portion U2.

  FIG. 10 also shows the state of the unit coil C2 of the first distributed winding portion U1 and the unit coil C10 of the second distributed winding portion U2. The interlinkage magnetic flux from the S pole for the unit coil C10 of the second distributed winding portion U2 is a portion from the entire S pole region of the rotor 36. On the other hand, the interlinkage magnetic flux from the S pole for the unit coil C2 of the first distributed winding portion U1 is the amount obtained by subtracting ΔP from the entire S pole region of the rotor 36. That is, the flux linkage from the S pole for the unit coil C2 of the first distributed winding portion U1 is less than the flux linkage from the S pole for the unit coil C10 of the second distributed winding portion U2.

  FIG. 11 is a diagram for explaining the state of the interlinkage magnetic flux in the unit coil of the first distributed winding portion U1 and the interlinkage magnetic flux in the unit coil of the second distributed winding portion U2. The middle diagram of FIG. 11 is a diagram illustrating a part of the rotor 30. The center positions of the magnetic poles of the first rotor part 32 and the second rotor part 34 are shifted by ΔP. This ΔP is the same as one slot, which is an arrangement difference between the unit coil C1 of the first distributed winding portion U1 and the unit coil C9 of the second distributed winding portion. 11, the center position of the unit coil C1 of the first distributed winding portion U1 matches the center position of the N pole of the first rotor portion 32, and the unit coil C9 of the second distributed winding portion U2 has a center position. The state when the center position matches the center position of the N pole of the second rotor portion 34 is shown. This state corresponds to the electrical angle described in FIG. 9 of 90 ° or 270 °, as in the state of FIG.

  As can be seen from FIG. 11, the interlinkage magnetic flux from the N pole for the unit coil C <b> 1 of the first distributed winding portion U <b> 1 is from the entire N pole region of the first rotor portion 32 and the second rotor portion 34. Is the sum of the amount obtained by subtracting ΔP from the entire N-pole region. The interlinkage magnetic flux from the N pole for the unit coil C9 of the second distributed winding portion U2 is obtained by subtracting ΔP from the entire N pole region of the first rotor portion 32, and the second rotor portion 34. And the sum from the entire N-pole region. Therefore, the linkage magnetic flux from the N pole for the unit coil C1 of the first distributed winding portion U1 is the same as the linkage magnetic flux from the N pole for the unit coil C9 of the second distributed winding portion U2.

  FIG. 11 also shows the state of the unit coil C2 of the first distributed winding portion U1 and the unit coil C10 of the second distributed winding portion U2. The interlinkage magnetic flux from the S pole for the unit coil C2 of the first distributed winding portion U1 is from the entire S pole region of the first rotor portion 32 and the entire S pole region of the second rotor portion 34. The sum is obtained by subtracting the amount of ΔP. The interlinkage magnetic flux from the south pole of the unit coil C10 of the second distributed winding portion U2 is obtained by subtracting ΔP from the entire south pole region of the first rotor portion 32, and the second rotor portion 34. And the sum from the entire S pole region. Therefore, the interlinkage magnetic flux from the S pole for the unit coil C2 of the first distributed winding portion U1 is the same as the interlinkage magnetic flux from the S pole for the unit coil C10 of the second distributed winding portion U2.

  In FIG. 11, looking at the first rotor part 32, the flux linkage in the unit coil C1 or the unit coil C2 of the first distributed winding part U1 is in the unit coil C9 or the unit coil C10 of the second distributed winding part U2. The maximum value is reached before the linkage flux. That is, in the first rotor portion 32, the phase of the unit coil of the first distributed winding portion U1 is advanced with respect to the change of the interlinkage magnetic flux compared to the unit coil of the second distributed winding portion U2.

  On the other hand, in the second rotor portion 34, the interlinkage magnetic flux in the unit coil C9 or the unit coil C10 of the second distributed winding portion U2 is the unit coil C1 or the unit coil C2 of the first distributed winding portion U1. The maximum value is reached before the flux linkage. That is, in the second rotor portion 34, the phase of the unit coil of the second distributed winding portion U2 is advanced with respect to the change of the interlinkage magnetic flux compared to the unit coil of the first distributed winding portion U1.

  This is shown in FIGS. 12 and 13 are the same as FIG. 9, and the horizontal axis represents the electrical angle and the vertical axis represents the interphase voltage. As the interphase voltage, the voltage of the first distributed winding portion U1, the voltage of the second distributed winding portion U2, and the voltage between the voltage of the first distributed winding portion U1 and the voltage of the second distributed winding portion U2. The difference is shown. The voltage of the first distributed winding portion U1 is proportional to the magnitude of the interlinkage magnetic flux of the unit coil constituting the first distributed winding portion U1, and the voltage of the second distributed winding portion U2 is the second distributed winding. It is proportional to the magnitude of the interlinkage magnetic flux of the unit coil constituting the part U2.

  As can be seen from FIG. 12, in the first rotor portion 32, the phase of the voltage of the first distributed winding portion U1 is advanced than the voltage of the second distributed winding portion U2. Further, as can be seen from FIG. 13, in the second rotor portion 34, the phase of the voltage of the second distributed winding portion U2 is advanced than the voltage of the first distributed winding portion U1.

  Further, the voltage difference between the voltage of the second distributed winding portion U2 and the voltage of the first distributed winding portion U1 shown in FIG. 13, the voltage of the first distributed winding portion U1 shown in FIG. The voltage difference between the voltages of the distributed winding portion U2 has the same waveform with respect to the electrical angle. That is, the voltage difference due to the first rotor part 32 and the voltage difference due to the second rotor part 34 have the opposite signs and the same magnitude. Thereby, the voltage difference between the voltage of the first distributed winding part U1 and the voltage of the second distributed winding part U2 by the first rotor part 32 and the voltage of the first distributed winding part U1 by the second rotor part 34 are obtained. And the voltage difference between the voltages of the second distributed winding portions U2 cancel each other. Therefore, no circulating current is generated between the first distributed winding portion U1 and the second distributed winding portion U2.

  Thus, by combining the U-phase distributed winding 20 described in FIG. 7 with the rotor 30 having the configuration described in FIG. 4, it is possible to suppress the generation of circulating current in the double star distributed winding.

  The rotating electrical machine stator according to the present invention can be used for a rotating electrical machine that uses a double-winding distributed winding stator.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine stator, 12 Stator core, 14 slots, 20 U-phase distributed winding, 21 unit coil, 23 coil strand, 26 unit coil space | interval, 30, 36 rotor, 32 1st rotor part, 34 2nd rotor part.

Claims (2)

A stator core disposed along the circumferential direction, each having a plurality of slots extending in the radial direction;
Formed by connecting a series of n unit coils in series in the circumferential direction of the stator core with a coil formed by winding a coil wire at a unit coil interval as a unit coil interval with a predetermined slot interval as a unit coil N unit coils are arranged in series on one circumference in the circumferential direction of the stator core using a first distributed winding portion and a different slot spaced from the first distributed winding portion by a predetermined slot interval. A second distributed winding portion formed by each phase winding of the distributed winding formed by connecting in parallel;
A rotor having a first rotor portion that is a half region on one end side along the axial direction and a second rotor portion that is a half region on the other end side, in the circumferential direction of the first rotor portion A rotor whose magnetic pole center position along the circumferential direction of the second rotor portion is different by a circumferential distance corresponding to a predetermined slot interval;
A rotating electric machine comprising: In the rotating electrical machine according to claim 1,
The first distributed winding part is
The unit coil interval is set to 6 slots, and one winding end slot and the other winding start slot of adjacent unit coils are shared, and n pieces are connected and arranged in series in one circumference in the circumferential direction of the stator core,
The second distributed winding part is
A slot adjacent to the slot used in the first distributed winding portion is used, and one winding end slot and the other winding start slot of adjacent unit coils are shared, and n in series in the circumferential direction of the stator core. Connected and formed,
The magnetic pole center position along the circumferential direction of the first rotor portion and the magnetic pole center position along the circumferential direction of the second rotor portion are different from each other by a circumferential distance corresponding to one slot interval in the circumferential direction of the stator core. Rotating electric machine.

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