JP2017121108A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of improving the space factor of a coil.SOLUTION: In a rotary electric machine 1 comprising a stator 10 having an armature coil 11 and a rotor 20, the rotor 20 includes a rotor core 21 in which plural salient pole portions 26 are formed at a predetermined interval in a circumferential direction, an induction coil 22 which is wound around the salient pole portion 26 and generates induction current by interlacing space harmonic components superimposed on a magnetic flux generated on the stator 10 side, a field coil 23 which is wound around the salient pole portion 26 and supplied with rectified induction current to function as an electromagnet, and a compensating pole member 50 formed of a magnetic body that is disposed between the salient pole portions 26 adjacent to each other in the circumferential direction. The compensating pole member 50 includes a beam portion 51 for connecting the salient pole portions 26 adjacent in the circumferential direction, and a leg portion 52 that protrudes radially inward from the beam portion 51 and does not contact the rotor core 21.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rotating electrical machine.

  In Patent Document 1, salient pole portions are provided at a plurality of locations in the circumferential direction of the rotor core, and two salient pole portions adjacent in the circumferential direction and a bottom portion of a slot between the salient pole portions adjacent in the circumferential direction are not provided. There is disclosed a rotating electric machine in which T-shaped holding members made of a magnetic material are supported, and a magnetic body is held by the holding members. An induction coil and a common coil are wound around the slots of the rotor core.

JP 20131655592 A

  However, in the rotating electrical machine described in Patent Document 1, since the area occupied by the holding member in the slot of the rotor core is large, the area where the induction coil and the common coil in the slot are wound is limited. For this reason, the space factor of an induction coil and a common coil will fall. A decrease in the space factor leads to a decrease in torque of the rotating electrical machine. For this reason, in a rotary electric machine, it is desirable to improve the coil space factor.

  This invention is made | formed in view of the above situations, and it aims at providing the rotary electric machine which can improve the space factor of a coil.

  In order to achieve the above object, the present invention is a rotating electrical machine comprising a stator having an armature coil that generates a magnetic flux when energized, and a rotor that rotates by the passage of the magnetic flux. And a rotor core having a plurality of salient pole portions formed at a predetermined interval, and a spatial harmonic component superimposed on the magnetic flux generated on the stator side and linked to the induced current. An induction coil that is generated, and a field coil that is wound around the salient pole portion and functions as an electromagnet when the induced current is rectified and supplied, and a salient pole portion that is adjacent in the circumferential direction are disposed respectively. An auxiliary pole member made of a magnetic material, and the auxiliary pole member is connected to a beam portion connecting between salient pole portions adjacent to each other in the circumferential direction, and radially inward from the beam portion. Protrudes and is not against the rotor core And a catalyst such leg.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary electric machine which can improve the space factor of a coil can be provided.

FIG. 1 is a cross-sectional view of a rotating electrical machine according to an embodiment of the present invention. FIG. 2 is a partially enlarged sectional view of the rotating electrical machine according to the embodiment of the present invention. FIG. 3 is a connection diagram of a closed circuit including an induction coil and a field coil of a rotating electrical machine according to an embodiment of the present invention. FIG. 4 is a partially enlarged cross-sectional view showing a connection state between the auxiliary pole member and the salient pole part of the rotating electrical machine according to the embodiment of the present invention. FIG. 5 is a schematic diagram showing the flow of the spatial harmonic magnetic flux between the stator and the rotor. FIG. 5A shows an example in which no auxiliary pole member is provided, and FIG. It is a figure which shows the example provided with the complement member. FIG. 6 is a graph showing the relationship between the magnetic flux and induced current of the induction coil and the electrical angle, and is a graph comparing an example with and without an auxiliary pole member. FIG. 7 is a graph showing the relationship between the magnetic flux and the order, and is a graph comparing an example with and without an auxiliary pole member. FIG. 8 is a comparative graph of various torques depending on the presence / absence of an auxiliary pole member. FIG. 8 (a) shows an example without an auxiliary pole member, and FIG. 8 (b) shows an example with an auxiliary pole member. FIG. FIG. 9 is a comparative graph of output torque according to the material of the auxiliary pole member. FIG. 10 is a graph showing the relationship between various torques and electrical angles. FIG. 10 (a) shows the case where an isotropic electrical steel sheet is used as the auxiliary pole member, and FIG. It is a figure which shows the case where a grain-oriented electrical steel plate is used for a pole member.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 10 are diagrams illustrating a rotating electrical machine according to an embodiment of the present invention.

  As shown in FIGS. 1 and 2, the rotating electrical machine 1 includes a stator 10 having an armature coil 11 that generates a magnetic flux when energized, and a rotor 20 that rotates by the passage of the magnetic flux generated in the stator 10. . The stator 10 and the rotor 20 are formed by laminating electromagnetic steel plates in the axial direction along the axis of a rotating shaft (not shown) of the rotating electrical machine 1.

  As will be described below, the rotating electrical machine 1 is a self-excited wound field rotating electrical machine that does not need to input energy to the rotor 20 from the outside. The rotating electrical machine 1 has a performance suitable for mounting on, for example, a hybrid vehicle or an electric vehicle.

(Stator)
The stator 10 is fixed to a motor case (not shown). The stator 10 includes an annular stator core 12 made of a magnetic material having a high magnetic permeability. The stator core 12 is provided with a plurality of stator teeth 13 protruding inward in the radial direction along the circumferential direction. Between stator teeth 13 adjacent in the circumferential direction, a slot that is a groove-like space is formed. In addition, a radial direction shows the direction orthogonal to the above-mentioned axial direction. The radially inner side refers to a side close to a rotating shaft (not shown) of the rotating electrical machine 1 in the radial direction, and the radially outer side refers to a side farther from the rotating shaft (not shown) of the rotating electrical machine 1 in the radial direction. Show.

  The stator teeth 13 include a first stator teeth 13A formed integrally with the stator core 12, and a second stator teeth 13B configured separately from the stator core 12. The first stator teeth 13 </ b> A and the second stator teeth 13 </ b> B are alternately arranged in the circumferential direction of the stator core 12.

  The second stator teeth 13B have a flask-like coupling portion 30 in which a protruding tip protruding outward in the radial direction from the outer peripheral surface on the stator core 12 side swells in the circumferential direction. On the inner peripheral surface in the radial direction of the stator core 12, a notch 12 a that is notched in a flask shape corresponding to the outer shape of the coupling portion 30 of the second stator teeth 13 </ b> B is formed.

  The second stator teeth 13 </ b> B are detachably attached to the stator core 12 by fitting the coupling portion 30 into the notch portion 12 a of the stator core 12 from the axial direction. The stator 10 may be configured such that a notch portion is formed in the second stator teeth 13B and a coupling portion is formed in the stator core 12.

  In each slot of the stator core 12, a three-phase armature coil 11 of W phase, V phase, and U phase is arranged along the circumferential direction of the stator core 12. Each of the W-phase, V-phase, and U-phase armature coils 11 is concentratedly wound around the respective stator teeth 13. The armature coil 11 is attached to the stator teeth 13 via an insulator 32 formed of a nonmagnetic material such as an insulating resin.

  The stator 10 generates a rotating magnetic field that rotates in the circumferential direction when a three-phase alternating current is supplied to the armature coil 11. Magnetic flux generated in the stator 10 is linked to the rotor 20. Thereby, the stator 10 can rotate the rotor 20.

(Rotor)
The rotor 20 is disposed on the radially inner side of the stator core 12 so that the outer peripheral surface faces the inner peripheral surface of the stator core 12. The rotor 20 includes a rotor core 21, an induction coil 22, a field coil 23, a rectifier circuit 24, an auxiliary pole member 50, and a resin mold part 60.

  The rotor core 21 is made of a magnetic material having a high magnetic permeability, and is fixed so as to be integrally rotatable with a rotating shaft (not shown). The rotor core 21 is formed with a plurality of salient pole portions 26 projecting radially outward from the rotor core 21 at predetermined intervals along the circumferential direction of the rotor core 21.

  An induction coil 22 and a field coil 23 are concentratedly wound around the salient pole portion 26. The induction coil 22 and the field coil 23 are attached to the salient pole portion 26 via an insulator 27 formed of a nonmagnetic material such as an insulating resin.

  The induction coil 22 is disposed closer to the stator 10 than the field coil 23, and spatial harmonic components (hereinafter referred to as “spatial harmonic magnetic flux”) superimposed on the magnetic flux generated on the stator 10 side are linked. As a result, an induced current is generated. As described above, the magnetic flux generated in the stator 10 includes a magnetic flux of the fundamental wave component of the rotating magnetic field that rotates the rotor 20 (hereinafter referred to as “main magnetic flux”) and a space that is not synchronized with the fundamental wave component. Harmonic flux is included.

  The induction coil 22 is configured such that the induction coil 22S and the induction coil 22N wound around the salient pole portions 26 adjacent to each other in the circumferential direction form circular windings in opposite directions. The induction coil 22 is connected to the field coil 23 via a rectifying element described later.

  The field coil 23 functions as an electromagnet by rectifying an alternating induction current generated in the induction coil 22 and supplying it as a direct current.

  The field coil 23 is configured such that the field coil 23S and the field coil 23N wound around the salient pole portions 26 adjacent to each other in the circumferential direction form circular windings in opposite directions. Therefore, the salient pole portions 26 arranged in the circumferential direction form S poles and N poles alternately in the circumferential direction when a direct current is supplied to each field coil 23.

(Rectifier circuit)
As shown in FIG. 3, the rectifier circuit 24 rectifies the induced current generated in the induction coil 22 and supplies it to the field coil 23.

  The rectifier circuit 24 includes two diodes D1 and D2 as rectifier elements. The rectifier circuit 24 is configured as a closed circuit in which the diodes D1 and D2 and the induction coils 22N and 22S and the field coils 23N and 23S wound around the salient pole portions 26 adjacent to each other in the circumferential direction of the rotor core 21 are connected. Yes.

  The rectifier circuit 24 includes two induction coils 22 and two field coils 23 wound around the N-pole salient pole portion 26 and the S-pole salient pole portion 26 adjacent to each other in the circumferential direction of the rotor core 21. Each set is provided. Therefore, the rotating electrical machine 1 includes a number of rectifier circuits 24 corresponding to the number of pole pairs of the rotor 20.

  The diodes D1 and D2 are provided on the rotor 20 in a state of being housed in a diode case (not shown), for example. The diodes D1 and D2 may be mounted inside the rotor 20. The rectifying element is not limited to a diode, and may be a semiconductor element such as another switching element.

  The rectifier circuit 24 is a neutral-point-clamped full-wave rectifier circuit that inverts one of the induced currents and adds the half-wave rectified outputs by connecting the diodes D1 and D2 so as to have a phase difference of 180 degrees. It is formed.

  In the rectifier circuit 24, the AC induced current generated in the induction coils 22N and 22S is rectified by the diodes D1 and D2, and the rectified DC current is supplied to the field coils 23N and 23S as a field current. Thereby, field coil 23N, 23S can generate a magnetic field, and can function as an electromagnet.

  Here, the AC induced current described above is generated when the spatial harmonic magnetic flux superimposed on the magnetic flux generated on the stator 10 side is linked to the induction coil 22. The spatial harmonic magnetic flux is generated when the magnetic resistance in the gap between the stator 10 and the rotor 20 fluctuates when the rotor 20 having the salient pole portion 26 rotates with respect to the concentrated winding type stator 10.

  Such a spatial harmonic magnetic flux is referred to as a second spatial harmonic magnetic flux in the stationary coordinate system on the stator 10. Further, as in the present embodiment, the rotating electrical machine 1 in which the number of slots of the stator 10 is “18” and the number of salient poles of the rotor 20 is “12”, that is, the slot combination of the stator 10 and the rotor 20 is “3: 2”. In the rotating coordinate system on the rotor 20, the third spatial harmonic magnetic flux is referred to.

  Specifically, when the slot combination of the stator 10 and the rotor 20 is “3: 2”, the d-axis inductance in the positive direction and the d-axis inductance in the negative direction are not symmetrical, and the amplitudes are different from each other. As the rotor 20 rotates, the offset amount of the d-axis inductance changes. As a result, a second-order spatial harmonic magnetic flux is generated in the stationary coordinate system on the stator 10, and a third-order spatial harmonic magnetic flux is generated in the rotating coordinate system on the rotor 20.

  Since the third spatial harmonic magnetic flux is not synchronized with the fundamental wave component of the rotating magnetic field that rotates the rotor 20, the third spatial harmonic magnetic flux is linked to the induction coil 22 to induce an AC induced current.

  As described above, the rotating electrical machine 1 of the present embodiment increases the mutual inductance between the stator 10 and the rotor 20 in order to use more third-order spatial harmonic magnetic flux as a field energy source. It is preferable to increase the induced electromotive force generated in the coil 22.

  Therefore, in the rotating electrical machine 1 of the present embodiment, as shown in FIGS. 1 and 2, the auxiliary pole member 50 made of a magnetic material is provided on the q axis between the salient pole portions 26 adjacent in the circumferential direction of the rotor core 21. Each is arranged. As a result, the magnetic path through which the third spatial harmonic magnetic flux passes in the rotor 20 is expanded, and the magnetic resistance of the magnetic path through which the third spatial harmonic magnetic flux passes is reduced. As a result, the rotating electrical machine 1 of the present embodiment can efficiently use the third spatial harmonic magnetic flux.

(Supplementary member)
As shown in FIG. 4, the auxiliary pole member 50 is formed in a T shape when viewed from the axial direction of the rotating electrical machine 1, and is formed by laminating a plurality of electromagnetic steel plates in the axial direction.

  Here, a resin mold part 60 is provided between the salient pole part 26 and the auxiliary pole member 50 adjacent to each other in the circumferential direction of the rotor core 21. The resin mold part 60 is formed by filling a resin in a gap between the salient pole part 26 and the auxiliary electrode member 50 and hardening the resin. Thereby, the auxiliary pole member 50, the induction coil 22, the field coil 23, and the rotor core 21 are firmly fixed to each other.

  The auxiliary pole member 50 is formed integrally with the beam portion 51 that connects between the salient pole portions 26 adjacent to each other in the circumferential direction of the rotor core 21 and the beam portion 51, and is directed from the beam portion 51 toward the inner side in the radial direction of the rotor core 21. And a leg portion 52 having a protruding shape.

  The salient pole portions 26 adjacent to each other in the circumferential direction of the rotor core 21 have end portions 26a on the outer side in the radial direction. A concave portion 26c is formed on a side surface 26b in the circumferential direction of the end portion 26a. The recess 26 c is formed in a groove shape along the axial direction of the salient pole portion 26, and is formed on each side surface 26 b on both sides in the circumferential direction of the salient pole portion 26.

  In the auxiliary pole member 50, both end portions 51b, which will be described later, in the circumferential direction of the beam portion 51 are fitted in the concave portions 26c of the salient pole portions 26 adjacent in the circumferential direction. As a result, the complementary electrode member 50 is fixed to the salient pole portions 26 adjacent to each other in the circumferential direction of the rotor core 21 via the recesses 26 c. Thereby, it is possible to prevent the induction coil 22 and the field coil 23 from being displaced outward in the radial direction by centrifugal force when the rotor 20 rotates.

  The beam portion 51 includes an arc portion 51a having a facing surface 510 facing the stator 10, an end portion 51b positioned on the inner side in the radial direction of the arc portion 51a, and an arc portion 51a and the end portions 51b. The connection part 51c provided is comprised.

  The arc portion 51 a is formed in an arc shape so that the opposing surface 510 is along the radial outer peripheral surface 260 of the salient pole portion 26. The arc portion 51a only needs to be positioned on the radially outer side of the radial position of the salient pole portion 26. Preferably, the opposing surface 510 and the outer peripheral surface 260 of the salient pole portion 26 are the same circle. It arrange | positions so that it may become a surrounding surface.

  The arrangement of the arc portions 51a can be changed by arbitrarily setting the radial position of the concave portion 26c of the salient pole portion 26 or the size and shape of the connecting portion 51c. Further, in the arc portion 51a, it is preferable that the curvature radius of the facing surface 510 is set to be the same as the curvature radius of the outer peripheral surface 260.

  Both end portions 51b are fitted into the concave portions 26c of the salient pole portions 26 adjacent in the circumferential direction. The shape and dimensions of the connecting portion 51c are set so as to have a gap D between the circumferential side surface of the salient pole portion 26, that is, the circumferential side surface 26b of the end portion 26a.

  For this reason, the auxiliary pole member 50 is fixed to the salient pole part 26 in a state where only the both end parts 51b are connected to the salient pole part 26 adjacent in the circumferential direction via the concave part 26c. Therefore, the arc part 51 a and the connecting part 51 c of the auxiliary pole member 50 are configured not to contact the salient pole part 26.

  Thereby, the contact area of the auxiliary pole member 50 and the salient pole part 26 can be reduced, and the magnetic flux flowing from the stator 10 to the salient pole part 26 is prevented from leaking to the auxiliary pole member 50 as a leakage flux. Can do.

  In the present embodiment, the shape of the connecting portion 51 c is inclined from both ends in the circumferential direction of the arc portion 51 a to the radially inward side, but the arc portion 51 a and the connecting portion 51 c do not contact the salient pole portion 26. Any shape may be adopted as long as it is a shape.

  The leg portion 52 has a radially inner end 52a and a pair of side surfaces 52b provided on both sides in the circumferential direction. The length of the leg portion 52 in the radial direction is set to such a length that the tip 52 a is located on the radially inner side of the induction coil 22 and the tip 52 a is not in contact with the field coil 23. . Therefore, the leg portion 52 is not in contact with the rotor core 21.

  The leg part 52 has the protrusion 52c which protruded in the circumferential direction on each of a pair of side surface 52b. The protrusion 52c is provided at a position that does not contact the opposing induction coil 22 and the field coil 23, preferably provided at a position facing the induction coil 22, and more preferably, the beam portion 51 of the positions facing the induction coil 22. It is provided in the position which is near and does not contact the beam part 51.

  Further, the protrusion 52c is set to have a length in the circumferential direction, that is, a length that protrudes in the circumferential direction from the side surface 52b so as not to contact the opposing induction coil 22 and field coil 23. The protrusion 52c is formed in a shape in which the radial cross-sectional shape is triangular and the side on the beam portion 51 side is orthogonal to the side surface 52b. The triangular shape of the protrusion 52c may be a triangular shape in which the side on the tip 52a side is orthogonal to the side surface 52b.

  In the present embodiment, the protrusion 52c described above is provided on the side surface 52b of the leg portion 52, so that the protrusion 52 is caught on the resin mold portion 60 even when a centrifugal force is applied to the auxiliary pole member 50, for example. It is possible to prevent the pole member 50 from being displaced outward in the radial direction.

  The protrusions 52c may be formed continuously in the axial direction, or a plurality of protrusions 52c may be provided at predetermined intervals in the axial direction. A plurality of protrusions 52c may be provided at predetermined intervals in the radial direction of each side surface 52b.

  Further, the positions of the protrusions 52 c provided on the respective side surfaces 52 b in the circumferential direction of the legs 52 may be different. In the present embodiment, the protrusions 52 c are provided on both side surfaces 52 b in the circumferential direction of the leg portion 52, but may be provided only on one side in the circumferential direction of the leg portion 52.

  Further, the radial cross-sectional shape of the protrusion 52c is not limited to a triangular shape as long as the protrusion 52c is hooked on the resin mold portion 60 even when centrifugal force is applied to the auxiliary pole member 50, and may be any shape. . As other cross-sectional shapes of the protrusions 52c, various shapes such as a square shape, a semicircular shape, and a warhead shape can be employed.

  As described above, the auxiliary electrode member 50 configured as described above is formed by laminating a plurality of electromagnetic steel plates in the axial direction. As the electromagnetic steel plate, a directional electromagnetic steel plate that is easily magnetized in a certain direction is used.

  Specifically, the grain-oriented electrical steel sheet constituting the auxiliary pole member 50 is a direction indicated by an arrow B1 in FIG. 4, that is, a direction from the beam part 51 to the leg part 52 and a direction from the leg part 52 to the beam part 51. It has a magnetic characteristic that the magnetic flux easily passes along.

  For this reason, the magnetic flux does not easily pass through the auxiliary pole member 50 in the circumferential direction. Therefore, between the end portion 26a of the salient pole portion 26 and the beam portion 51 of the auxiliary pole member 50, the direction indicated by the arrow B2 in FIG. 4, that is, the direction from the salient pole portion 26 toward the beam portion 51 and the beam portion 51. It is difficult for the magnetic flux to pass in the direction from the first to the salient pole portion 26.

  Thus, in the auxiliary pole member 50, the spatial harmonic magnetic flux generated on the stator 10 side can easily pass in the direction indicated by the arrow B1 in FIG. 4, while the main magnetic flux flowing from the stator 10 to the salient pole portion 26 is increased. As a leakage magnetic flux, it is difficult for the beam 51 to leak.

  Thereby, space harmonic magnetic flux can be efficiently linked to the induction coil 22 via the auxiliary pole member 50, and leakage magnetic flux leaking from the salient pole portion 26 to the auxiliary pole member 50 can be suppressed.

  The directional electrical steel sheet is not limited to the direction indicated by the arrow B in FIG. 4. For example, the direction of the magnetic flux passing through the auxiliary electrode member 50 is confirmed by experimental analysis or the like, and the magnetic flux is passed in the direction along the confirmed magnetic flux direction. It is also possible to use a grain-oriented electrical steel sheet having easy magnetic properties. In this case, since the directional electrical steel sheet that is easily magnetized in the direction of the magnetic flux that actually passes through the auxiliary pole member 50 is used, more spatial harmonic magnetic flux can be linked to the induction coil 22.

  In the auxiliary pole member 50 configured as described above, the both end portions 51b of the beam portion 51 are salient poles from the axial direction of the rotor core 21 in a state where the induction coil 22 and the field coil 23 are wound around each salient pole portion 26. By being inserted into the recess 26 c of the portion 26, the salient pole portion 26 is fixed. At this time, only the both end portions 51b of the auxiliary pole member 50 are in contact with the salient pole portion 26 through the recess 26c, and the connecting portion 51c is not in contact with the salient pole portion 26. Easy to attach. Thereafter, the gap between the salient pole portion 26 and the auxiliary electrode member 50 is filled with resin to form the resin mold portion 60.

(Operational effect of rotating electrical machine 1)
FIG. 5 shows a comparison between the rotating electrical machine 1 of the present embodiment provided with the auxiliary electrode member 50 and the rotating electric machine 101 not provided with the auxiliary electrode member 50 with respect to the flow of the spatial harmonic magnetic flux between the stator and the rotor. FIG. FIG. 5 is a schematic diagram in which the stator and the rotor are linearly arranged. In both the rotating electrical machine 1 and the rotating electrical machine 101, the induction coils 22 and 122 are wound around the salient pole portions 26 and 126, respectively, along the radial direction of the rotors 20 and 120.

  As shown in FIG. 5 (a), in the rotating electrical machine 101 that does not include the auxiliary pole member 50, the spatial harmonic magnetic flux indicated by the broken line in FIG. 5 (a) is applied to the induction coil 122 on the radially outer side. The chain is linked and does not link up to the induction coil 122 on the radially inner side.

  Therefore, in the rotating electrical machine 101, since the space harmonic magnetic flux linked to the induction coil 122 is small, the field energy supplied to the field coil 123 is also small. As a result, compared with the rotating electrical machine 1 of the present embodiment, the electromagnet torque generated between the stator 110 and the rotor 120 is reduced, and the output torque of the rotating electrical machine 101 is reduced.

  On the other hand, as shown in FIG. 5B, the rotating electrical machine 1 of the present embodiment provided with the auxiliary pole member 50 has a spatial harmonic magnetic flux indicated by a broken line in FIG. 50 is linked to the induction coil 122 on the inner side in the radial direction.

  Therefore, in the rotating electrical machine 1, the spatial harmonic magnetic flux linked to the induction coil 22 is increased as compared with the rotating electrical machine 101 described above. Further, in the rotating electrical machine 1, since the leg portion 52 of the auxiliary pole member 50 extends to the inner side in the radial direction with respect to the induction coil 22 as described above, more spatial harmonic magnetic flux is generated by the induction coil 22. It can be recovered.

  For this reason, the field energy supplied to the field coil 23 also increases. As a result, the electromagnet torque generated between the stator 10 and the rotor 20 is increased and the output torque of the rotating electrical machine 1 is increased as compared with the rotating electrical machine 101 described above.

  FIG. 6 shows an example in which an auxiliary pole member is provided (described as “with an auxiliary pole” in FIG. 6) and an example in which no auxiliary pole member is provided (in FIG. It is a graph comparing “under complementary pole” under the same conditions. The example provided with the auxiliary pole member is the rotating electrical machine 1 of the present embodiment, and the example not provided with the auxiliary pole member is, for example, the rotating electric machine 101 described above.

  As shown in FIG. 6, the rotating electrical machine 1 of the present embodiment provided with an auxiliary pole member has a magnetic flux interlinked with the induction coil 22 (in FIG. There are many). Therefore, it can be seen from FIG. 6 that the rotating electrical machine 1 of the present embodiment provided with the auxiliary pole member has a larger induced current generated in the induction coil 22 as compared with the example without the auxiliary pole member.

  Further, in the example that does not include the auxiliary pole member, the generation of the induced current is limited in the vicinity of the electrical angles of 40 [deg], 160 [deg], and 280 [deg]. This is because the sixth spatial harmonic magnetic flux generated together with the third spatial harmonic magnetic flux interferes with the third spatial harmonic magnetic flux. That is, the sixth spatial harmonic magnetic flux can be a component that interferes with the generation of the induced current by interfering with the third spatial harmonic magnetic flux.

  Since the ratio of the sixth spatial harmonic magnetic flux to the third spatial harmonic magnetic flux is high in the low load and low rotational range of the rotating electrical machine, the sixth spatial harmonic magnetic flux has a great influence on the generation of the induced current. give. Therefore, it is desirable that the sixth-order spatial harmonic magnetic flux is as small as possible.

  FIG. 7 shows an example (provided that “complementary pole is present” in FIG. 7) including a supplementary pole member regarding the relationship between the magnetic flux interlinking with the induction coil (referred to as “inductive coil magnetic flux” in FIG. 7) and the order. It is the graph which compared on the same conditions the example (it is described as "no supplementary pole" in FIG. 7) which does not provide an auxiliary pole member. The example provided with the auxiliary pole member is the rotating electrical machine 1 of the present embodiment, and the example not provided with the auxiliary pole member is, for example, the rotating electric machine 101 described above.

  As shown in FIG. 7, the rotating electrical machine 1 according to the present embodiment including the supplementary pole member has a large amount of third-order spatial harmonic magnetic flux as compared with the example not including the supplementary pole member. Furthermore, it turns out that the rotary electric machine 1 of this Embodiment has few 6th space harmonic magnetic flux compared with the example which is not provided with an auxiliary pole member.

  This is due to the following reason. That is, in the rotating electrical machine 1 according to the present embodiment, since the auxiliary pole member 50 is provided between the salient pole portions 26 adjacent to each other in the circumferential direction of the rotor 20, the magnetic resistance fluctuation between the salient poles becomes moderate. As a result, in the rotating electrical machine 1 of the present embodiment, it is possible to reduce the sixth-order spatial harmonic magnetic flux that is generated together with the third-order spatial harmonic magnetic flux.

  Thus, the rotary electric machine 1 of this Embodiment can reduce a 6th space harmonic magnetic flux, increasing the 3rd space harmonic magnetic flux utilized as field energy. Thereby, the output torque of the rotary electric machine 1 can be increased efficiently.

  Here, the output torque of the rotating electrical machine 1 is the sum of the reluctance torque and the electromagnet torque. The reluctance torque is a rotational force that rotates the rotor 20 so as to shorten the magnetic path through which the magnetic flux interlinking between the stator 10 and the rotor 20 passes. The electromagnet torque is a rotational force generated by attraction and repulsion between the pole of the rotating magnetic field and the magnetic pole of the electromagnet by the field coil 23 of the rotor 20.

  Therefore, in order to increase the output torque of the rotating electrical machine 1, both the reluctance torque and the electromagnet torque may be increased. However, in order to increase the reluctance torque, it is necessary to increase the magnetic resistance fluctuation between the salient poles of the rotor. In order to increase the magnetic resistance fluctuation between the salient poles of the rotor, it is not necessary to provide an auxiliary pole member between the salient poles of the rotor as in the rotating electrical machine 101 described above. However, in this case, the reluctance torque is increased, but the ripple of the reluctance torque is also increased. As a result, the fluctuation of the output torque of the rotating electrical machine is increased, which is not preferable.

  In the rotating electrical machine 1 of the present embodiment, the reluctance torque can be suppressed and the electromagnet torque can be increased by providing the above-described auxiliary pole member 50. As a result, the output torque can be increased while suppressing fluctuations in the output torque of the rotating electrical machine 1.

  FIG. 8 is a graph comparing reluctance torque, electromagnet torque and output torque (referred to as “motor torque” in FIG. 8) under the same conditions between an example with an auxiliary electrode member and an example without an auxiliary electrode member. is there. FIG. 8A shows an example that does not include an auxiliary electrode member, and FIG. 8B shows an example that includes an auxiliary electrode member. The example provided with the auxiliary pole member is the rotating electrical machine 1 of the present embodiment, and the example not provided with the auxiliary pole member is, for example, the rotating electric machine 101 described above.

  As shown in FIG. 8A, in the example that does not include the complementary electrode member, the reluctance torque is large as compared with the example that includes the complementary electrode member, but the ripple of the reluctance torque is also large. Further, in the example that does not include the auxiliary electrode member, since the auxiliary electrode member is not provided, the induced current generated in the induction coil is small. For this reason, in the example which is not provided with an auxiliary pole member, compared with the example which is provided with an auxiliary pole member, electromagnet torque is also small. Therefore, in the example without the auxiliary pole member, not only the output torque is smaller than in the example with the auxiliary pole member, but also the ripple of the output torque becomes larger.

  On the other hand, as shown in FIG. 8 (b), in the rotating electrical machine 1 of the present embodiment provided with the auxiliary pole member, the reluctance torque is small as compared with the example not provided with the auxiliary pole member. Ripple is suppressed. Moreover, since the rotating electrical machine 1 according to the present embodiment includes an auxiliary pole member, the induced current generated by the induction coil is also large. For this reason, in the rotary electric machine 1 of this Embodiment, compared with the example which is not provided with an auxiliary pole member, an electromagnet torque is large.

  Therefore, in the rotating electrical machine 1 according to the present embodiment, the output torque is large and the ripple of the output torque is small compared to an example that does not include an auxiliary pole member.

  FIG. 9 is a graph comparing the output torque of the rotating electrical machine under the same conditions when plastic, stainless steel, an isotropic electrical steel sheet and a directional electrical steel sheet are used as the material of the auxiliary pole member. An isotropic electrical steel sheet is an electrical steel sheet that is not magnetized in a specific direction.

  As shown in FIG. 9, it can be seen that the output torque is the largest when the directional electromagnetic steel plate is used among the plastic, stainless steel, isotropic electromagnetic steel plate and directional electromagnetic steel plate as the material of the auxiliary electrode member.

  In the rotating electrical machine 1 according to the present embodiment, as described above, the grain-oriented electrical steel sheet having magnetic characteristics that allow magnetic flux to easily pass in the direction indicated by the arrow B1 in FIG. The output torque can be increased as compared with the case where a heat-resistant electrical steel sheet is used.

  FIG. 10 is a graph comparing the output torque of the rotating electrical machine 1 between an example using an isotropic electrical steel sheet as a material of the auxiliary pole member 50 and an example using a directional electrical steel sheet under the same conditions. FIG. 10A shows reluctance torque, electromagnet torque and output torque when an isotropic electrical steel sheet is used as the material of the auxiliary pole member 50, and FIG. 10B shows the direction as the material of the auxiliary pole member 50. The reluctance torque, the electromagnet torque, and the output torque in the case of using a conductive electromagnetic steel sheet are shown.

  As shown in FIGS. 10A and 10B, the output torque of the rotating electrical machine 1 is larger when the directional electromagnetic steel plate is used as the material of the auxiliary pole member 50 than when the isotropic electromagnetic steel plate is used. I understand that. When an isotropic electrical steel sheet is used as the material of the auxiliary pole member 50, the main magnetic flux from the stator 10 is likely to flow into the auxiliary pole member 50 as a leakage magnetic flux. The output torque of the rotating electrical machine 1 is smaller than when it is used.

  As described above, in the rotating electrical machine 1 according to the present embodiment, the auxiliary pole member 50 made of a magnetic material includes the beam portion 51 that connects between the salient pole portions 26 adjacent in the circumferential direction, and the radial direction from the beam portion 51. It has the leg part 52 which protrudes toward the inner side and is not in contact with the rotor core 21.

  For this reason, in the rotating electrical machine 1 according to the present embodiment, the auxiliary pole member 50 made of a magnetic material is directly fixed to the salient pole portion 26 via the beam portion 51. A member etc. become unnecessary. Therefore, the area occupied by the induction coil 22 and the field coil 23 between the salient pole portions 26 adjacent to each other in the circumferential direction can be expanded as much as there is no holding member.

  As a result, the space factor of the induction coil 22 and the field coil 23 in the rotor 20 can be improved compared with the conventional case. Thereby, the rotary electric machine 1 of this Embodiment can improve an output torque compared with the past.

  The rotating electrical machine 1 can be used as a generator for wind power generation or an electric motor for machine tools, for example, in addition to in-vehicle use.

  In this embodiment, the rotary electric machine 1 is applied to a radial gap type rotary electric machine, but may be applied to an axial gap type rotary electric machine.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 10 Stator 11 Armature coil 20 Rotor 21 Rotor core 22, 22S, 22N Inductive coil 23, 23S, 23N Field coil 24 Rectifier circuit 26 Salient pole part 26a End part 26b Side face 26c Recessed part 50 Supplementary pole member 51 Beam part 51a Arc part 51b Both end parts 51c Connecting part 52 Leg part 52b Side face 52c Protrusion 60 Resin mold part 260 Outer peripheral surface 510 Opposing surface D Gap

Claims (5)

A rotating electric machine comprising a stator having an armature coil that generates a magnetic flux when energized, and a rotor that rotates by the passage of the magnetic flux,
The rotor is
A rotor core having a plurality of salient pole portions formed at predetermined intervals in the circumferential direction;
An induction coil that is wound around the salient pole and generates an induced current by interlinking of spatial harmonic components superimposed on the magnetic flux generated on the stator side;
A field coil wound around the salient pole and functioning as an electromagnet by rectifying and supplying the induced current;
An auxiliary pole member made of a magnetic material disposed between salient pole portions adjacent in the circumferential direction, and
The auxiliary pole member includes a beam portion that connects between salient pole portions adjacent in the circumferential direction, and a leg portion that protrudes inward in the radial direction from the beam portion and that is not in contact with the rotor core. Rotating electric machine characterized by that. The salient pole part has an end part radially outward,
A concave portion is formed on a side surface in the circumferential direction of the end portion,
2. The rotating electrical machine according to claim 1, wherein both ends of the beam portion in the circumferential direction are fitted in the concave portions of the salient pole portions adjacent to each other in the circumferential direction. The beam portion is
An arc portion formed in an arc shape so that the facing surface facing the stator follows the radial outer peripheral surface of the salient pole portion;
The both ends located on the inner side in the radial direction from the arc portion;
A connecting portion provided between the arc portion and the both end portions,
The rotating electrical machine according to claim 2, wherein the connecting portion has a gap between a circumferential side surface of the salient pole portion.   The auxiliary pole member is formed by stacking directional electrical steel sheets having magnetic characteristics that magnetic flux easily passes along a direction from the beam portion toward the leg portion and a direction from the leg portion toward the beam portion in the axial direction of the rotor core. The rotating electrical machine according to any one of claims 1 to 3, wherein the rotating electrical machine is made of any of the above. The rotor has a resin mold portion between a salient pole portion adjacent in the circumferential direction and the complementary electrode member,
The rotating electrical machine according to claim 1, wherein the auxiliary pole member has a protrusion on a side surface of the leg portion.

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