JP5798456B2 - Rotor for rotating electrical machines - Google Patents

Description

The present invention relates to a shaft, a plurality of rotor core elements provided on the outside of the shaft, and a plurality of rotor core elements forming a rotor core coupled to the shaft by arranging the plurality of rotor core elements in an annular shape, and each rotor core It relates to a rotary electric machine rotor and a plurality of coils that are wound around the element.

  The motor described in Patent Literature 1 includes a rotor disposed on the radially inner side of the stator, and the stator includes a plurality of stator coils wound around the plurality of teeth of the stator core by concentrated winding. The rotor includes a plurality of rotor coils wound around a plurality of salient poles protruding in the radial direction of the rotor core. The stator generates a rotating magnetic field by causing a three-phase alternating current to flow through the stator coil. When a magnetic field including harmonic components formed in the stator teeth is linked to the rotor coil, magnetic flux fluctuations are generated in the rotor coil. The rotor coil includes, on the salient pole of the rotor, a rotor coil disposed in the vicinity of the gap with the stator, and another rotor coil that is separate from the rotor coil and disposed farther from the stator than the rotor coil.

  Rotor coils wound around adjacent salient poles, and rotor coils arranged far from the stator are connected in series with each other, and mainly have an effect of forming a magnetic field with an induced current. In addition, the rotor coil disposed near the stator mainly has an effect of exciting the induced current. A rotor coil that mainly forms a magnetic field is commonly connected to a rotor coil that mainly excites an induced current and another rotor coil that mainly excites an induced current. A rotor current rectified using a half-wave rectifier circuit is induced in a rotor coil that mainly excites an induced current.

  Patent Document 2 describes a rotor having a cylindrical rotor core and a plurality of teeth projecting radially from the outer peripheral surface of the rotor core, and a rotor coil is wound around the teeth. Protrusions protruding from the outer peripheral surface of the rotor core are formed in a portion between adjacent rotor coils on the outer peripheral surface of the rotor core. Both ends of the holding member extending along the outside of the rotor coil are inserted and disposed in the groove formed on the circumferential side surface of the tip portion of the tooth portion and the groove formed on the circumferential side surface of the projection portion. The holding member restricts the rotor coil from coming out radially outward from between the tooth and the protrusion.

  Moreover, the rotor for rotating electrical machines described in Patent Document 3 includes an iron core plate configured by alternately arranging a plurality of first teeth and second teeth one by one in the circumferential direction. The first teeth are provided on both sides in the circumferential direction of the root portion and have engaging convex portions protruding radially inward, and the second teeth are provided on both sides in the circumferential direction of the root portion and recessed inward in the radial direction. It has an engagement concave part, and the movement of each tooth in the radial direction is regulated by engaging the engagement convex part and the engagement concave part between adjacent teeth.

  In addition, the rotor for a rotating electrical machine described in Patent Document 4 includes a shaft, a through hole that is formed in the center portion and fits with the shaft, and a plurality of locking grooves that are formed in the axial length direction on the outer peripheral portion. A center core having a plurality of magnetic steel plates stacked in the axial direction, a plurality of pole cores having a dovetail portion that fits into a locking groove of the center core, and a plurality of rotor coils wound around each pole core And.

JP 2010-279165 A JP 2008-178211 A JP 2003-134708 A Japanese Patent Laid-Open No. 11-18337

  In the motor described in Patent Document 1, since the rotor core is formed of a single member, the rotor coil can be removed while increasing the space factor of the rotor coil in the slot between adjacent salient poles. There is still room for improvement in terms of effective prevention.

  On the other hand, in the rotor described in Patent Document 2, the rotor coil is held by the protruding portion of the rotor core and the holding member, but the rotor coil is not held only by the rotor core, but on the outside of the rotor coil. A holding member extending in the circumferential direction along the protrusion and a protrusion extending in the radial direction of the rotor core are required.

  On the other hand, it is also conceivable to form a rotor core such as an iron core plate by a plurality of teeth corresponding to a plurality of rotor core elements arranged at a plurality of locations in the circumferential direction, as in the rotor described in Patent Document 3. However, in the rotor of Patent Document 3, since it is necessary to connect a plurality of teeth by engaging the engaging convex portion and the engaging concave portion between adjacent teeth, a factor that increases the radial dimension of the rotor. It becomes.

  In the rotor described in Patent Document 4, when the magnetic flux generated in the stator flows from one pole core corresponding to the rotor core element to another pole core corresponding to another rotor core element, the air gap from one pole core. Magnetic flux flows through the shaft via Further, magnetic flux flows from the shaft to another pole core through another air gap. For this reason, the magnetic flux passes through the air gap twice between the pole core and the shaft, a large eddy current flows due to the magnetic flux change based on the difference in the material of the pole core and the shaft, the magnetic resistance increases, and the performance of the rotating electrical machine increases. May be reduced.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating electrical machine rotor that includes a plurality of rotor core elements arranged at a plurality of locations in the circumferential direction, reduces the magnetic resistance in the magnetic path through which the magnetic flux generated by the stator passes, It is to improve performance.

A rotor for a rotating electrical machine according to the present invention includes a shaft including a plurality of convex portions provided on an outer peripheral surface, and a plurality of concave portions into which a part of the convex portions of the plurality of convex portions are respectively fitted in the axial direction. Each of the plurality of rotor core elements forming a rotor core coupled to the shaft by disposing the plurality of rotor core elements at a plurality of circumferential positions outside the shaft; and and a plurality of coils to be wound, the said rotor core element are adjacent to each other in the circumferential direction, wherein in contact circumferentially rotor side root portion provided on the coupling side against the shaft, the width in the circumferential direction of the convex portion there a radially inward of the maximum width portion becomes maximum, a rotary electric machine rotor, wherein the backlash reduction pin is arranged between the rotor core elements are adjacent to each other in the circumferential direction That.

Moreover, the rotor for a rotating electrical machine according to the present invention includes a shaft including a plurality of convex portions provided on an outer peripheral surface, and a concave portion in which the convex portions of the plurality of convex portions are respectively fitted in the axial direction. A plurality of rotor core elements including the plurality of rotor core elements, wherein the plurality of rotor core elements are arranged at a plurality of locations in a circumferential direction outside the shaft to form a rotor core coupled to the shaft; A plurality of coils wound around the element, and the rotor core elements adjacent in the circumferential direction are in contact with each other in the circumferential direction at a rotor side root portion provided on the coupling side with respect to the shaft ; Each of the plurality of adjacent rotor core elements is connected to each other at a distal end portion, and each of the rotor core elements is connected to each other. Around, said to be disposed radially inside the respective auxiliary protruding portion, at least a portion of the coil of said plurality of coils is a rotary electric machine rotor, characterized in that it is wound.

Further, in the rotating electric machine rotor according to the present invention, preferably, the plurality of coils, said around each rotor core element, the inner coil which is wound so as to be positioned radially inwardly of the respective auxiliary protruding portion If the around each rotor core element, and an outer coil which is wound so as to be disposed radially outwardly of the respective auxiliary protruding portion.

  Moreover, in the rotor for a rotating electrical machine according to the present invention, preferably, each of the auxiliary protrusions is arranged in a circumferential direction so as to become radially outward from a root side that is a connection side to each of the rotor core elements toward the tip. It is slanted.

  In the rotor for a rotating electrical machine according to the present invention, preferably, at least a part of the auxiliary protrusions of the auxiliary protrusions is formed of a magnetic material.

  According to the rotor for a rotating electrical machine of the present invention, in a configuration including a plurality of rotor core elements arranged at a plurality of locations in the circumferential direction, a magnetic path through which much of the magnetic flux generated in the stator passes does not pass through the shaft. The magnetic resistance can be reduced, and the performance of the rotating electrical machine can be improved.

It is sectional drawing which shows a part of rotary electric machine containing the rotor for rotary electric machines which concerns on the 1st Embodiment of this invention. In the rotary electric machine including the rotor according to the first embodiment, FIG. In the rotary electric machine containing the rotor of 1st Embodiment, it is a schematic diagram which shows a mode that the magnetic flux produced | generated by the induced current which flows into a rotor coil flows in a rotor. FIG. 4 is a diagram corresponding to FIG. 3 and showing a rotor coil connected with a diode. In 1st Embodiment, it is a figure which shows the equivalent circuit of the connection circuit of the some coil wound around two salient poles adjacent to the circumferential direction of a rotor. FIG. 6 is a diagram corresponding to FIG. 5 and showing another example in which the number of diodes connected to the rotor coil is reduced. It is AA sectional drawing in the rotor of FIG. It is the B section enlarged view of FIG. It is the enlarged view which abbreviate | omitted one part and was seen in the arrow C direction of FIG. FIG. 10 is a diagram showing a part in the circumferential direction of a plurality of metal plates arranged at the position of arrow D in FIG. 9 in the rotor core. FIG. 10 is a diagram showing a part in the circumferential direction of a plurality of metal plates arranged at the position of arrow E in FIG. 9 in the rotor core. FIG. 10 is a diagram showing a part in the circumferential direction of a plurality of metal plates arranged at the position of arrow F in FIG. 9 in the rotor core. FIG. 9 is an enlarged view corresponding to a part G in FIG. 8 illustrating a flow of magnetic flux in the rotor according to the first embodiment. It is a schematic sectional drawing which shows the flow of magnetic flux in the rotor of a comparative example. It is a figure which shows distribution of the compressive stress which acts at the time of rotation of a rotor in the circumferential direction part of a rotor. It is a figure which shows the magnetic flux density contour (contour line display) of the rotor corresponding to FIG. 13, when flowing a magnetic flux in a rotor from a stator. It is a figure which shows the analysis result of the one part circumferential direction magnetic flux flow of a rotor in the case of flowing magnetic flux in a rotor from a stator. It is a perspective view which shows the rotor core which comprises the rotor of the 2nd Embodiment of this invention. It is a figure which shows the some 1st metal plate which comprises a part of axial direction of the rotor core of FIG. It is a figure which shows the some 2nd metal plate which comprises a part of axial direction of the rotor core of FIG. It is a figure which shows the some 3rd metal plate which comprises a part of axial direction of the rotor core of FIG.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 13 and 15 are views showing a first embodiment of the present invention. FIG. 1 is a schematic cross-sectional view showing a part of a rotating electrical machine including the rotor for a rotating electrical machine according to the present embodiment. As shown in FIG. 1, the rotating electrical machine 10 functions as an electric motor or a generator, and is arranged to face a stator 12 fixed to a casing (not shown) and radially inward with a predetermined gap from the stator 12. And a rotating electrical machine rotor (hereinafter simply referred to as “rotor”) 14 that is rotatable with respect to the stator 12. The “radial direction” refers to a radial direction orthogonal to the rotation center axis of the rotor 14 (unless otherwise specified, the meaning of “radial direction” is the same throughout the present specification and claims). ).

  The stator 12 includes a stator core 16 made of a magnetic material, and stator coils 20u, 20v, and 20w of a plurality of phases (for example, three phases of U phase, V phase, and W phase) disposed on the stator core 16. The rotor 14 includes a rotor core 24 made of a magnetic material, a shaft 25 that is inserted and fixed in the center of the rotor core 24, and two end plates 26 a and 26 b that are disposed on both sides in the axial direction of the rotor core 24. . The rotor 14 is a plurality of rotor coils disposed on the rotor core 24. The N pole induction coil 28n, the S pole induction coil 28s, the N pole common coil 30n, the S pole common coil 30s, and the N pole induction coil A first diode 38 connected to 28n and a second diode 40 connected to the south pole induction coil 28s.

  First, the basic configuration of the rotating electrical machine 10 will be described using FIGS. 2 to 5, and then the detailed structure of the rotor 14 will be described. FIG. 2 is a schematic cross-sectional view showing part of the rotor and the stator in the circumferential direction in the rotating electrical machine including the rotor of the present embodiment. FIG. 3 is a schematic diagram showing how a magnetic flux generated by an induced current flowing in the rotor coil flows in the rotor in the rotating electrical machine including the rotor of the present embodiment. FIG. 4 is a view corresponding to FIG. 3 and showing a diode connected to the rotor coil.

  As shown in FIG. 2, the stator 12 includes a stator core 16, and a plurality of teeth 18 projecting radially inward (toward the rotor 14) are disposed at a plurality of locations in the circumferential direction on the inner circumferential surface of the stator core 16. Slots 22 are formed between the teeth 18. The stator core 16 is formed of a magnetic material such as a laminate of metal plates such as electromagnetic steel plates having magnetism such as silicon steel plates. The plurality of teeth 18 are arranged at intervals from each other along the circumferential direction around the rotation center axis that is the rotation axis of the rotor 14. The “circumferential direction” means a direction along a circle drawn around the rotation center axis of the rotor 14 (in the whole specification and claims, the meaning of “circumferential direction” is the same unless otherwise specified). .)

The stator coils 20u, 20v, and 20w of each phase are wound around the teeth 18 of the stator core 16 by concentrated short-winding windings through the slots 22. As described above, the stator coils 20u, 20v, and 20w are wound around the teeth 18 to form magnetic poles. Then, by passing a plurality of phases of alternating current through the plurality of phases of the stator coils 20u, 20v, 20w, the teeth 18 arranged in the circumferential direction are magnetized, and a rotating magnetic field that rotates in the circumferential direction is generated in the stator 12. it can. The stator coils 20u, 20v, and 20w are not limited to the configuration in which the stator coils 20 are wound around the teeth 18 of the stator 12 as described above. It is also possible to generate a rotating magnetic field in the stator 12 by using a toroidal winding for winding the stator coil.

  The rotating magnetic field formed on the teeth 18 acts on the rotor 14 from the tip surface. In the example shown in FIG. 2, one pole pair is constituted by three teeth 18 around which three-phase (U-phase, V-phase, W-phase) stator coils 20u, 20v, 20w are wound.

  On the other hand, the rotor 14 includes a rotor core 24 made of a magnetic material, and a plurality of rotor coils, an N-pole induction coil 28n, an N-pole common coil 30n, an S-pole induction coil 28s, and an S-pole common coil 30s. The rotor core 24 is a plurality of magnetic pole portions provided so as to protrude radially outward (toward the stator 12) at a plurality of locations in the circumferential direction of the outer peripheral surface, and is a main salient pole and the second tooth N It has a pole forming salient pole 32n and an S pole forming salient pole 32s. The N pole forming salient poles 32n and the S pole forming salient poles 32s are alternately arranged along the circumferential direction of the rotor core 24 and spaced from each other, and the salient poles 32n and 32s face the stator 12. doing. The rotor yoke 33 and the plurality of salient poles 32n and 32s, which are the annular portions of the rotor core 24, are integrally provided by annularly connecting a plurality of rotor core elements that are a laminate of a plurality of magnetic metal plates. Yes. This will be described in detail later. The N pole forming salient pole 32n and the S pole forming salient pole 32s have the same shape and size.

More specifically, two N-pole rotor coils, that is, an N-pole common coil 30n and an N-pole induction coil 28n, are wound in a concentrated manner on every other N-pole forming salient pole 32n in the circumferential direction of the rotor 14 . They have been times. Moreover, in the rotor 14, it is another salient pole adjacent to the N pole formation salient pole 32n, and each of the S pole formation salient poles 32s of every other circumferential direction is two S pole rotor coils. the coils 30s and S-pole induction coil 28s are wound in concentrated winding. Each common coil 30n, 30s is an inner coil, and each induction coil 28n, 28s is an outer coil.

  The rotor 14 has a slot 34 (FIG. 3) formed between salient poles 32n and 32s adjacent in the circumferential direction. That is, a plurality of slots 34 are formed in the rotor core 24 at intervals in the circumferential direction around the rotation axis of the rotor 14. Further, the rotor core 24 is fitted and fixed to the outside in the radial direction of the shaft 25 (FIG. 1) which is a rotating shaft.

  Each N-pole induction coil 28n is wound around each N-pole forming salient pole 32n on the tip side of the N-pole common coil 30n, that is, on the side closer to the stator 12. Each S pole induction coil 28 s is wound around the tip side of each S pole forming salient pole 32 s, that is, the side closer to the stator 12 than the S pole common coil 30 s. In addition, as shown in FIG. 3, the induction coils 28n and 28s and the common coils 30n and 30s wound around the salient poles 32n and 32s are respectively in the length direction around the salient poles 32n (or 32s) (see FIG. 3). 3 (up and down direction of 3) may be arranged in an aligned winding in which a plurality of layers are aligned in the circumferential direction (left and right direction in FIG. 3) of the salient pole 32n (or 32s). In addition, the induction coils 28n and 28s wound around the front ends of the salient poles 32n and 32s may be wound around the salient poles 32n and 32s a plurality of times, that is, a plurality of turns.

  As shown in FIG. 4 and FIG. 5, N pole induction wound around one N pole forming salient pole 32n with two salient poles 32n and 32s adjacent in the circumferential direction of the rotor 14 as one set. One end of the coil 28n and one end of the S-pole induction coil 28s wound around another S-pole forming salient pole 32s are two magnetic characteristic adjusting units and a first diode 38 and a second diode 40 which are rectifier elements. Connected through. That is, FIG. 5 shows a connection of a plurality of coils 28n, 28s, 30n, 30s wound around two salient poles 32n, 32s (FIG. 2) adjacent to each other in the circumferential direction of the rotor 14 (FIG. 2) in this embodiment. It is a figure which shows the equivalent circuit of a circuit. As shown in FIG. 5, one end of each of the N-pole induction coil 28n and the S-pole induction coil 28s is connected at a connection point R via a first diode 38 and a second diode 40 whose forward directions are opposite to each other. .

  As shown in FIGS. 4 and 5, one end of the N-pole common coil 30n wound around the N-pole forming salient pole 32n in each group is connected to one end of the S-pole common coil 30s wound around the S-pole forming salient pole 32s. It is connected. The N-pole common coil 30n and the S-pole common coil 30s are connected in series to form a common coil set 36. Further, the other end of the N-pole common coil 30n is connected to the connection point R, and the other end of the S-pole common coil 30s is the other end opposite to the connection point R between the N-pole induction coil 28n and the S-pole induction coil 28s. It is connected to the. The winding central axes of the induction coils 28n and 28s and the common coils 30n and 30s coincide with the radial direction of the rotor 14 (FIG. 2). Each induction coil 28n, 28s and each common coil 30n, 30s are wound around the corresponding salient pole 32n (or 32s) via an insulator (not shown) having electrical insulation made of resin or the like. Can also be done.

  In such a configuration, as will be described later, the rectified current flows through the N-pole induction coil 28n, the S-pole induction coil 28s, the N-pole common coil 30n, and the S-pole common coil 30s. It is magnetized and functions as a magnetic pole part. Returning to FIG. 3, the stator 12 generates a rotating magnetic field by passing an alternating current through the stator coils 20 u, 20 v, and 20 w, and this rotating magnetic field is higher than the fundamental wave as well as the magnetic field of the fundamental wave component. It contains a magnetic field of harmonic components of the order.

  More specifically, the distribution of magnetomotive force that generates a rotating magnetic field in the stator 12 is caused by the arrangement of the stator coils 20u, 20v, and 20w of each phase and the shape of the stator core 16 by the teeth 18 and the slots 22 (FIG. 2). , It does not have a sinusoidal distribution (of only the fundamental wave), but includes harmonic components. In particular, in the concentrated winding, the stator coils 20u, 20v, and 20w of the respective phases do not overlap each other, so that the amplitude level of the harmonic component generated in the magnetomotive force distribution of the stator 12 increases. For example, when the stator coils 20u, 20v, 20w are three-phase concentrated windings, the harmonic component is a temporal third-order component of the input electrical frequency, and the amplitude level of the spatial second-order component increases. Thus, the harmonic component generated in the magnetomotive force due to the arrangement of the stator coils 20u, 20v, and 20w and the shape of the stator core 16 is called a spatial harmonic.

  When a rotating magnetic field including this space-emphasized wave component acts on the rotor 14 from the stator 12, fluctuations in leakage magnetic flux leaking into the space between the salient poles 32 n and 32 s of the rotor 14 are generated due to magnetic flux fluctuations in the spatial harmonics. Thereby, an induced electromotive force is generated in at least one of the induction coils 28n and 28s of the induction coils 28n and 28s shown in FIG. In addition, the induction coils 28n and 28s on the tip side of the salient poles 32n and 32s close to the stator 12 mainly have a function of generating an induction current, and the common coils 30n and 30s far from the stator 12 mainly project. It has a function of magnetizing the poles 32n and 32s, that is, functions as an electromagnet. Further, as understood from the equivalent circuit of FIG. 5, the total current flowing through the induction coils 28n and 28s wound around the adjacent salient poles 32n and 32s (FIGS. 2 to 4) is applied to the common coils 30n and 30s. Each current flows. Since the adjacent common coils 30n and 30s are connected in series, the same effect can be obtained as when the number of turns is increased in both, and the common magnetic flux remains the same in each salient pole 32n and 32s. The current flowing through the coils 30n and 30s can be reduced.

  When an induced electromotive force is generated in each induction coil 28n, 28s, a direct current corresponding to the rectification direction of the diodes 38, 40 is applied to the N-pole induction coil 28n, the S-pole induction coil 28s, the N-pole common coil 30n, and the S-pole common coil 30s. When the salient poles 32n and 32s around which the common coils 30n and 30s are wound are magnetized, the salient poles 32n and 32s function as a magnetic pole portion that is a magnet with a fixed magnetic pole. The winding directions of the N pole induction coil 28n and the N pole common coil 30n adjacent to each other in the circumferential direction and the S pole induction coil 28s and the S pole common coil 30s shown in FIG. The magnetization direction is reversed between the salient poles 32n and 32s. In the example shown in the drawing, the N pole is generated at the tip of the salient pole 32n around which the N pole induction coil 28n and the N pole common coil 30n are wound, and the S pole induction coil 28s and the S pole common coil 30s are wound around. An S pole is generated at the tip of the pole 32s. For this reason, the N pole and the S pole are alternately arranged in the circumferential direction of the rotor 14. That is, the rotor 14 is configured such that N-poles and S-poles are alternately formed in the circumferential direction by interlinking of harmonic components included in the magnetic field generated by the stator 12.

  Further, as shown in FIG. 2, the width θ of each induction coil 28n, 28s and each common coil 30n, 30s in the circumferential direction of the rotor 14 is set shorter than the width corresponding to 180 ° in terms of the electrical angle of the rotor 14. The induction coils 28n and 28s and the common coils 30n and 30s are wound around the salient poles 32n and 32s in a short-pitch manner, respectively. More preferably, the width θ of each induction coil 28n, 28s and each common coil 30n, 30s in the circumferential direction of the rotor 14 is equal to or substantially equal to a width corresponding to 90 ° in electrical angle of the rotor 14. Here, regarding the width θ of each induction coil 28n, 28s and each common coil 30n, 30s, each induction coil 28n, 28s, It can be represented by the center width of the cross section of each common coil 30n, 30s. That is, the width θ of each induction coil 28n, 28s and each common coil 30n, 30s is represented by an average value of the widths of the inner peripheral surface and the outer peripheral surface of each induction coil 28n, 28s and each common coil 30n, 30s. Can do.

  In the present embodiment, the rotor 14 includes auxiliary salient poles 42 that are auxiliary projections that protrude from both circumferential sides of the salient poles 32n and 32s arranged at a plurality of locations in the circumferential direction. Auxiliary salient poles 42 are arranged in a circumferential direction from a plurality of locations in the axial direction (front and back directions in FIGS. 3 and 4) on both sides of the circumferential direction (left and right directions in FIGS. 3 and 4) of each salient pole 32n and 32s. It is a plate-like magnetic body that protrudes in an inclined direction. For example, in the example shown in the figure, the auxiliary salient pole 42 is inclined with respect to the circumferential direction so as to be radially outward of the rotor 14 toward the tip at the radial intermediate portions of the circumferential side surfaces of the salient poles 32n and 32s. doing. The plurality of auxiliary salient poles 42 are arranged between the N pole induction coil 28n and the N pole common coil 30n, and on the S pole induction coil 28s and the S pole common coil 30s on both sides in the circumferential direction of the salient poles 32n and 32s. Protrudes from each between. That is, the auxiliary salient pole 42 is magnetically connected to the corresponding salient poles 32n and 32s at the root portion.

  A plurality of auxiliary salient poles 42 disposed in the same slot 34 and projecting from the other salient poles 32n and 32s facing each other are mechanically coupled to each other. On the other hand, the plurality of auxiliary salient poles 42 protruding from the other salient poles 32n and 32s facing each other in the slot 34 can be magnetically separated. 3 and 4, the auxiliary salient pole 42 of the N pole forming salient pole 32n and the auxiliary salient pole 42 of the S pole forming salient pole 32s disposed in the same slot 34 are magnetically separated from each other. Is schematically shown. Such auxiliary salient poles 42 are made of the same magnetic material as the auxiliary salient poles 42 including the salient poles 32n and 32s.

  The induction coil 28n (or 28s) and the common coil 30n (or 30s) wound around each salient pole 32n (or 32s) are separated by the auxiliary salient pole 42 in the corresponding slot 34 and separated. . The induction coils 28n, 28s and the common coils 30n, 30s wound around the same salient poles 32n, 32s are auxiliary salient poles 42 such as one or both coil end sides (not shown) provided outside the axial end face of the rotor core 24. They are connected to each other at the part that is off. As shown in FIG. 8 to be described later, it is also possible to form a flange portion 44 that protrudes from both ends in the circumferential direction at the tip of each salient pole 32n (the same applies to 32s) to prevent the induction coils 28n and 28s from coming off. it can. The flange 44 can be omitted.

  In the rotating electrical machine 10 (FIG. 2) including such a rotor 14, a rotating magnetic field (basic) formed on the teeth 18 (FIG. 2) by flowing a three-phase alternating current through the three-phase stator coils 20 u, 20 v, 20 w. Wave component) acts on the rotor 14, and accordingly, the salient poles 32 n and 32 s are attracted to the rotating magnetic field of the teeth 18 so that the magnetic resistance of the rotor 14 is reduced. As a result, torque (reluctance torque) acts on the rotor 14.

  Further, when the rotating magnetic field including the spatial harmonic component formed in the teeth 18 is linked to the induction coils 28n and 28s of the rotor 14, each induction coil 28n and 28s has the rotor 14 caused by the spatial harmonic component. An induced electromotive force is generated in each induction coil 28n, 28s due to a magnetic flux fluctuation having a frequency different from the rotation frequency (the fundamental wave component of the rotating magnetic field). The current flowing through the induction coils 28n and 28s along with the generation of the induced electromotive force is rectified by the diodes 38 and 40 to be unidirectional (direct current). The salient poles 32n, 32s are magnetized in response to the direct current rectified by the diodes 38, 40 flowing through the induction coils 28n, 28s and the common coils 30n, 30s. 32s functions as a magnet in which the magnetic pole is fixed (on either the N pole or the S pole). As described above, since the rectification directions of the currents of the induction coils 28n and 28s by the diodes 38 and 40 are opposite to each other, the magnets generated in the salient poles 32n and 32s have N poles and S poles alternately in the circumferential direction. It will be arranged.

  In addition, as shown in FIG. 3, auxiliary salient poles 42 are formed on both sides in the circumferential direction of the salient poles 32n and 32s in a direction inclined with respect to the circumferential direction so as to be radially outward toward the tip. . Therefore, for example, a case where a q-axis magnetic flux, which is a magnetic flux of a spatial second-order spatial harmonic, flows from the stator 12 to the rotor 14 as the magnetomotive force of the stator 12 in the directions indicated by the broken arrows α and β in FIG. Considering this, a large amount of magnetic flux can be linked to the induction coils 28n and 28s by the auxiliary salient poles 42. That is, with a certain phase relationship between the stator 12 and the rotor 14, a spatial harmonic q-axis magnetic flux is supplied to one of the salient poles 32 n and 32 s from a part of the teeth 18 of the stator 12 via a part of the auxiliary salient poles 42. In some cases, a part of the salient poles 32n and 32s is guided to another tooth 18, and a large amount of magnetic flux can be linked to the induction coils 28n and 28s. The direction and magnitude of the q-axis magnetic flux changes in one electrical cycle, but the maximum amount of magnetic flux flowing through the induction coils 28n and 28s increases, so that the interlinkage magnetic flux of the induction coils 28n and 28s changes. Can be increased. For example, as indicated by a broken line arrow β in FIG. 3, there is a case where q-axis magnetic flux tends to flow from the teeth 18 of the stator 12 to the south pole forming salient pole 32 s via the south pole auxiliary salient pole 42. A magnetic flux tends to flow in the direction in which the formed salient pole 32s is an N pole. In this case, an induced current tends to flow through the south pole induction coil 28s in a direction that prevents this, and the flow is not blocked by the second diode 40 (FIG. 4). For this reason, as indicated by solid line arrows in FIG. 3, a magnetic flux caused by an induced current flows in the direction from the S pole forming salient pole 32 s to the N pole forming salient pole 32 n via the rotor yoke 33 of the rotor core 24.

  On the other hand, in other words, the q-axis magnetic flux tends to flow from the tooth 18 of the stator 12 to the auxiliary salient pole 42n via the N pole forming salient pole 32n in the direction opposite to the broken line arrow α in FIG. Yes, the magnetic flux tends to flow in the direction in which the N pole forming salient pole 32n is the S pole. In this case, an induced current tends to flow through the N-pole induction coil 28n in a direction that prevents this, and the flow is not blocked by the first diode 38 (FIG. 4), and the N-pole forming salient pole 32n is set as the N-pole. Current is passed through. Also in this case, a magnetic flux caused by an induced current flows in a direction from the S pole forming salient pole 32s to the N pole forming salient pole 32n via the rotor yoke 33. As a result, each salient pole 32n, 32s is magnetized to the N pole or the S pole. Since the auxiliary salient poles 42 protrude from both side surfaces of the salient poles 32n and 32s as described above, there is no auxiliary salient pole 42, that is, between the salient poles 32n and 32s adjacent in the circumferential direction in each slot 34. Since the maximum value of the amplitude of the magnetic flux linked to each induction coil 28n, 28s can be increased compared to the case where there is only space, the change of the linkage magnetic flux can be increased.

  Then, the magnetic field of each salient pole 32n, 32s (magnet with a fixed magnetic pole) interacts with the rotating magnetic field (fundamental wave component) generated by the stator 12 to cause attraction and repulsion. Torque (torque corresponding to magnet torque) is also applied to the rotor 14 by electromagnetic interaction (attraction and repulsion) between the rotating magnetic field (fundamental wave component) generated by the stator 12 and the magnetic field of the salient poles 32n and 32s (magnet). The rotor 14 is driven to rotate in synchronization with the rotating magnetic field (fundamental wave component) generated by the stator 12. In this way, the rotating electrical machine 10 can function as a motor that generates power (mechanical power) in the rotor 14 using the power supplied to the stator coils 20u, 20v, and 20w.

  In the above, two adjacent salient poles 32n and 32s are taken as one set, and in each set, the induction coils 28n and 28s wound around the two salient poles 32n and 32s are connected via two diodes 38 and 40, respectively. Explained the case of connection. For this reason, two diodes 38 and 40 are required for the two salient poles 32n and 32s. On the other hand, all the coils 28n, 28s, 30n, 30s wound around all the salient poles 32n, 32s of the rotor 14 can be connected, and only two diodes 38, 40 can be used. FIG. 6 is a diagram corresponding to FIG. 5 and showing another example in which the number of diodes connected to the rotor coil is reduced. In another example shown in FIG. 6, in the configuration shown in FIG. 3, FIG. 4, etc., the front end side of all N pole forming salient poles 32n (see FIG. 3) that are salient poles every other circumferential direction of the rotor. A plurality of N-pole induction coils 28n wound in series are connected in series to form an N-pole induction coil set Kn, and all the S-pole formation salient poles 32s adjacent to the N-pole formation salient poles 32n of the rotor (see FIG. 3) is connected in series to form a south pole induction coil set Ks. One ends of the N-pole induction coil set Kn and the S-pole induction coil set Ks are connected at a connection point R via a first diode 38 and a second diode 40 whose forward directions are opposite to each other.

  Further, when two N pole forming salient poles 32n and S pole forming salient poles 32s (see FIG. 3) adjacent to each other in the circumferential direction of the rotor are set as one set, the N pole common coil 30n and the S pole common coil in each set. The common coil set C1 is formed by connecting 30s in series, and all the common coil sets C1 related to all the salient poles 32n and 32s are connected in series. Furthermore, among a plurality of common coil sets C1 connected in series, one end of the N-pole common coil 30n of one common coil set C1 serving as one end is connected to the connection point R, and another common coil set C1 serving as the other end is connected. One end of the S-pole common coil 30s is connected to the other end opposite to the connection point R of the N-pole induction coil set Kn and the S-pole induction coil set Ks. In such a configuration, unlike the configurations shown in FIGS. 4 and 5, the total number of diodes provided in the rotor can be reduced to two, that is, the first diode 38 and the second diode 40.

  The above is the basic configuration and the operation of the rotating electrical machine 10 including the rotor 14 of the present embodiment. In the present embodiment, the rotor 14 includes a configuration including a plurality of rotor core elements arranged at a plurality of locations in the circumferential direction. In order to further improve the performance of the rotating electrical machine 10 by reducing the magnetic resistance in the magnetic path through which much of the magnetic flux generated in the stator 12 passes, the following specific configuration is adopted. A specific structure of the rotor 14 will be described with reference to FIGS. 7 to 9 and 13, the same or corresponding elements as those shown in FIGS. 1 to 6 are given the same reference numerals.

  FIG. 7 is a cross-sectional view taken along line AA in the rotor 14 of FIG. FIG. 8 is an enlarged view of a portion B in FIG. FIG. 9 is an enlarged view of a part omitted and viewed in the direction of arrow C in FIG. FIGS. 10-12 is a figure which respectively shows the circumferential direction part of the some metal plate arrange | positioned in the rotor core at the arrow D, E, F position of FIG.

  As shown in FIG. 7, the rotor 14 of the present embodiment includes a rotor core 24 and a shaft 25 that is fitted and fixed to the center of the rotor core 24. The shaft 25 includes a plurality of outer convex portions 46 that are provided at a plurality of locations in the circumferential direction of the outer peripheral surface and project in the radial direction. As shown in FIG. 8, each outer convex part 46 is a shape long in the axial direction with the same cross-sectional shape regarding the plane orthogonal to the axial direction as a whole. Each outer convex portion 46 is connected to the shaft-side root portion 48 having a small circumferential width and the shaft-side tip having a circumferential width larger than the circumferential width of the shaft-side root portion 48. Part 50. The shaft side tip 50 has a substantially elliptical cross-sectional shape. The shaft-side tip portion 50 has a maximum width portion 52 (FIG. 8) having a maximum circumferential width, and the circumferential width D1 of the maximum width portion 52 is the maximum circumferential width of the shaft-side root portion 48. It is larger than D2 (FIG. 8). The shaft 25 is made of a highly rigid material such as a solid material that is a steel material that does not contain silicon.

  Returning to FIG. 7, the rotor core 24 includes a first core element 54 and a second core element 56, each of which is a plurality of rotor core elements. The rotor core 24 is formed by alternately arranging the first core elements 54 and the second core elements 56 one by one in the circumferential direction and connecting them in an annular shape. Each core element 54, 56 is formed by laminating a plurality of thin metal plates in the axial direction. That is, each of the core elements 54 and 56 has a plurality of first metal plates 58 and second metal plates 60 having different shapes. Each of the metal plates 58 and 60 is a magnetic metal plate such as an electromagnetic steel plate such as a silicon steel plate. As shown in FIGS. 10 and 12, the first metal plate 58 is connected to the first rotor side root portion 62 provided on the coupling side with respect to the shaft 25 and the radially outer side of the first rotor side root portion 62. 1 rotor side front end portion 64. The first rotor side root portion 62 forms the rotor yoke 33 (FIG. 7), and the first rotor side tip portion 64 forms the N pole forming salient pole 32n or the S pole forming salient pole 32s (FIG. 7).

  The first rotor side root portion 62 includes two legs 68 projecting radially inward on both circumferential sides of the base 66. An inner recess 70 is formed on the radially inner side surface of the first rotor side base portion 62 including the inner side surface between the two leg portions 68. Inside the inner recess 70, an outer protrusion 46 provided on the shaft 25 is fitted in the axial direction. Each inner recess 70 is formed so as to open at the radially inner end of each core element 54, 56, and has a wide portion 72 with a larger circumferential width at the back. Both side surfaces in the circumferential direction of the first rotor side root portion 62 coincide with the radial direction of the rotor 14. On both side surfaces in the circumferential direction of the first rotor-side root portion 62, semicircular portions 74 are formed in the radially inner portion of the portion where the circumferential width of the inner recess 70 is maximum.

  Further, the first rotor side distal end portion 64 includes a substantially rectangular body portion 76 and inclined protrusions 78 protruding in a direction inclined with respect to the circumferential direction from both circumferential sides of the body portion 76. Each inclined protrusion 78 forms the auxiliary salient pole 42 (FIG. 2 and the like). A pin hole 85 is formed at the tip of each inclined protrusion 78 so as to penetrate in the axial direction. Circumferential protrusions 80 for forming the flanges 44 (FIG. 8) are formed on both side surfaces in the circumferential direction of the front end portion of each body portion 76, respectively.

  Such a 1st metal plate 58 is laminated | stacked on the 2nd metal plate 60 shown to FIGS. Similarly to the first metal plate 58, the second metal plate 60 also has a second rotor side root portion 82 provided on the coupling side with respect to the shaft 25, and a second rotor connected to the radially outer side of the second rotor side root portion 82. Side tip 84. The second rotor side root portion 82 has the same shape as the first rotor side root portion 62 described above, and includes two leg portions 68 and an inner recess 70. Similar to the first rotor side tip 64 (FIG. 10) of the first metal plate 58, the second rotor side tip 84 has a body 76, but inclined projections 78 (see FIG. 10) is not formed. Other shapes and sizes of the second metal plate 60 are the same as those of the first metal plate 58. That is, as with the first metal plate 58, the second metal plate 60 also has semicircular portions 74 formed on both sides in the circumferential direction of the second rotor side base portion 82, and has a circumferential protrusion 80 on the tip side. In addition, when the collar part 44 is abbreviate | omitted, the circumferential direction protrusion part 80 is also abbreviate | omitted. Each of the metal plates 58 and 60 has a target shape on the left and right with respect to the center in the circumferential direction. In addition, the first metal plate 58 and the second metal plate 60 have the same or substantially the same thickness, for example.

  Then, as shown in FIG. 7, a plurality of stacked first metal plates 58 are stacked with a plurality of stacked second metal plates 60, and the first core element including N pole forming salient poles 32n is repeated by repeating this. 54 is formed. Further, the second metal element 60 including the S pole forming salient pole 32 s is formed by laminating a plurality of laminated first metal plates 58 on the plurality of laminated second metal plates 60 and repeating this. In this case, the first core element 54 and the second core element 56 are of the same type in a state in which the tip ends of the respective inclined protrusions 78 are aligned with each other when viewed in the axial direction (front and back direction in FIG. 7). The arrangement position of the metal plate 58 (or 60) in the axial direction is shifted at least partially between the first core element 54 and the second core element 56. For this reason, the axial position of the inclined protrusion 78 is shifted between the first core element 54 and the second core element 56.

Further, as shown in FIG. 7, the adjacent core elements 54, 56 are aligned with each other between the tip ends of the inclined protrusions 78 in a state where the tip ends of the inclined protrusions 78 coincide with each other when viewed in the axial direction. A gap in the axial direction is formed. For this reason, as shown in FIG. 9, the number of stacked second metal plates 60 is increased by two or three or more than the number of stacked first metal plates 58. Further, as shown in FIG. 8, an N-pole common coil 30 n is wound on the base side with respect to the inclined projecting portion 78 of the first core element 54, and at the front end side with respect to the inclined projecting portion 78 of the first core element 54. It is wound N pole induction coil 28n. Further, the S-pole common coil 30 s is wound on the base side of the inclined protrusion 78 of the second core element 56, and the S-pole induction coil 28 s is wound on the tip side of the inclined protrusion 78 of the second core element 56 . I have been times.

  And as shown in FIG. 7, the 1st core element 54 and the 2nd core element 56 are alternately arrange | positioned in the circumferential direction, and are faced | matched cyclically | annularly. In this case, the circumferential side surfaces of the rotor-side base portions 62 and 82 of the adjacent core elements 54 and 56 are in contact with each other in the circumferential direction. Further, as shown in FIGS. 8 and 9, the distal end portion of the inclined projecting portion 78 of the first core element 54 and the distal end portion of the inclined projecting portion 78 of the second core element 56 adjacent to each other in the circumferential direction are respectively connected to the respective pins. The holes 85 (FIG. 8) are arranged so as to be aligned in the axial direction, that is, overlapped when viewed in the axial direction.

  In addition, connecting pins 86 are inserted into a plurality of pin holes 85 that are aligned in the axial direction at portions where the inclined projections 78 of the adjacent core elements 54 and 56 are overlapped in the axial direction. The connection pin 86 can be prevented from coming off by caulking one end portion or both end portions protruding outward from any core element 54 (or 56) of each connection pin 86. When a caulking portion is formed only at one end portion of each connecting pin 86, a head portion having a diameter larger than that of the other portion is formed integrally with the other end portion of each connecting pin 86 so that it can be prevented from coming off. To. In this case, each connecting pin 86 is inserted into a plurality of corresponding pin holes 85 with the opposite side to the head first, and a caulking portion is formed at a portion protruding outward from the axial end portion of the rotor core 24. Each of the core elements 54 and 56 can be pivotably connected by a connecting pin 86 around the connecting pin 86. Each connecting pin 86 can also be inserted into the corresponding pin hole 85 by press fitting.

  In addition, the semicircular portions 74 of the plurality of metal plates 58 and 60 laminated by the core elements 54 and 56 are aligned with each other in the axial direction to form a semicylindrical portion that is long in the axial direction, and adjacent core elements 54 and 56. The substantially cylindrical pin engaging portions 87 are formed by opposing the semi-cylindrical portions facing each other at the root portions thereof. That is, pin engaging portions 87 are arranged at a plurality of locations in the circumferential direction of the plurality of core elements 54 and 56. A backlash reducing pin 88 can be inserted into each pin engaging portion 87. In this way, the rotor core 24 is formed. Each connecting pin 86 and each backlash reducing pin 88 can be formed of a nonmagnetic material such as stainless steel.

  N pole forming salient poles 32 n and S pole forming salient poles 32 s that are alternately arranged in the circumferential direction of the rotor core 24 are formed by the laminated portions of the body portions 76 of the core elements 54 and 56. In addition, a plurality of auxiliary salient poles 42 are formed at a plurality of locations in the circumferential direction of the rotor core 24 by portions where a plurality of inclined protrusions 78 are stacked. A substantially annular rotor yoke 33 is formed by a portion where the rotor-side base portions 62 and 82 of the core elements 54 and 56 are annularly butted. In this state, when the rotor core 24 is considered in a cross section orthogonal to the axial direction, three different shapes of FIGS. 10 to 12 are formed according to different positions in the axial direction. 10 to 12 show the same range in the circumferential direction of the rotor core 24. For example, at one position in the axial direction of FIG. 10, the first metal plate 58 is disposed on the first core element 54, and the second metal plate 60 is disposed on the second core element 56. In another position in the axial direction of FIG. 11, the second metal plate 60 is disposed on both the first core element 54 and the second core element 56. In yet another position in the axial direction of FIG. 12, the second metal plate 60 is disposed on the first core element 54, and the first metal plate 58 is disposed on the second core element 56. That is, as shown by the arrow δ direction in FIG. 9, when the rotor core 24 is viewed from one side in the axial direction toward the other side, a portion in which a plurality of first metal plates 58 defined in advance are stacked and a plurality of first metal plates 58 are stacked. The two metal plates 60 are adjacent to each other in the circumferential direction (left and right direction in FIG. 9), and the second metal plates 60 are adjacent to each other on the other side (lower side in FIG. 9) in the circumferential direction. Each of these is stacked. Further, on the other side, a portion in which a plurality of predetermined second metal plates 60 are laminated and a portion in which a plurality of first metal plates 58 are laminated in the circumferential direction are laminated. Each of the second metal plates 60 arranged so as to be adjacent to each other in the circumferential direction is laminated, and this is repeated.

  The arrangement relationship and the number of stacked layers of the first metal plate 58 and the second metal plate 60 are not limited to this. For example, in each core element 54, 56, the number of stacked first metal plates 58 and the number of stacked second metal plates 60 are the same, and the tips of the inclined protrusions 78 of the first metal plate 58 are axially aligned. It can also be in contact. In this case, the auxiliary salient pole 42 is formed by each inclined protrusion 78.

  In addition, the first metal plate 58 and the second metal plate 60 are alternately arranged one by one in the first core element 54, and the second core element 56 is not adjacent to each other in the circumferential direction. Thus, the first metal plates 58 and the second metal plates 60 can be alternately arranged one by one. In this case, the tip end portions of the inclined protrusions 78 serving as the auxiliary salient poles 42 are alternately arranged in the axial direction between the first core elements 54 and the second core elements 56.

  As shown in FIG. 8, the space in which the induction coils 28 n and 28 s and the common coils 30 n and 30 s are arranged in each slot 34 of the rotor core 24 is filled with resin. For this reason, the coils 28n, 28s, 30n, 30s are hardened, and the coils 28n, 28s, 30n, 30s are prevented from falling off the rotor core 24. Further, a wire formed of carbon fiber can be wound around the outer peripheral surface of the rotor core 24. According to this configuration, the coils 28n, 28s, 30n, and 30s are more effectively prevented from falling off.

  When manufacturing such a rotor core 24, it manufactures as follows, for example. First, of the plurality of connecting pins 86, only one connecting pin 86 is removed from the two adjacent core elements 54 and 56, and the auxiliary salient poles 42 of the adjacent core elements 54 and 56 are connected to each other by the other connecting pins 86. In a state where the core elements 54 and 56 are connected via the pin 86, the corresponding induction coils 28n and 28s and the corresponding common coils 30n and 30s are wound around the salient poles 32n and 32s with the core elements 54 and 56 arranged in a line. To do. For example, each of the common coils 30n and 30s that have been wound in an air-core state can be fitted from the root side of the corresponding core elements 54 and 56 toward the body portion 76. Next, the adjacent core elements 54, 56 are arranged in an annular shape around the connecting pins 86, and the connecting pins 86 are inserted into the pin holes 85 in which no pins are inserted. Thereby, the rotor core 24 is formed.

  As shown in FIG. 1, the rotor 14 includes a shaft 25 fitted in the center portion of the rotor core 24, and two end plates 26 a and 26 b fixed to the shaft 25. In this case, as shown in FIG. 7, the outer convex portions 46 described above are formed at a plurality of locations in the circumferential direction of the outer peripheral surface of the shaft 25. The axial length of each outer convex portion 46 is, for example, substantially the same as the axial length of the rotor core 24 or slightly longer than this axial length. Each outer convex portion 46 is fitted in the inner concave portion 70 of each core element 54, 56 in the axial direction. For this reason, the shaft 25 is axially fitted to the inner side of the rotor core 24 so that the outer side convex portions 46 are fitted to the inner concave portions 70 of the rotor core 24 in the axial direction. Further, with the shaft 25 fitted to the rotor core 24, as shown in FIG. 8, a plurality of pin engaging portions 87 are provided with a plurality of pins so that the leg portions 68 of the adjacent core elements 54 and 56 are spread. The backlash reducing pin 88 is pushed, that is, inserted in the axial direction.

  Further, as shown in FIG. 1, two end plates 26 a and 26 b are fitted and fixed around the shaft 25 by press fitting or the like so as to be arranged on both sides of the rotor core 24 in the axial direction. It is abutted at both ends. In each of the coils 28n, 28s, 30n, and 30s, a recess 90 is formed on one end of each end plate 26a, 26b so as to avoid a coil end disposed outside the both ends of the rotor core 24 in the axial direction. Each of the end plates 26a and 26b is made of a nonmagnetic material, and abuts against the rotor core 24 at one end in the axial direction between the outer peripheral end and the inner peripheral end. For example, the axial ends of the outer peripheral portions of the end plates 26 a and 26 b can be abutted against the axial ends of the connecting portions of the auxiliary salient poles 42. In this case, a recess that inserts and holds a portion protruding in the axial direction from the rotor core 24 at the end of each connecting pin 86 may be formed at the axial end of the outer peripheral portion of each end plate 26a, 26b.

  The first diode 38 and / or the second diode 40 or both diodes 38 and 40 are held on at least one end plate 26a (or 26b) of the two end plates 26a and 26b. However, the present embodiment is not limited to such a configuration, and each diode 38 and 40 may be fixed directly or indirectly to the shaft 25 or the rotor core 24.

As described above, the rotor 14 includes the shaft 25 including the plurality of outer protrusions 46 provided on the outer peripheral surface, and the inner recesses in which some of the outer protrusions 46 of the plurality of outer protrusions 46 are fitted in the axial direction. It includes a first core element 54 and the second core element 56 of a plurality each containing 70, a plurality of coils 28n are wound on each core element 54, 56, 28s, 30n, and 30s. The plurality of core elements 54 and 56 are arranged at a plurality of locations in the circumferential direction outside the shaft 25, so that the rotor core 24 coupled to the shaft 25 is formed. Further, the core elements 54 and 56 adjacent in the circumferential direction are in contact with each other in the circumferential direction at the rotor side base portions 62 and 82 provided on the coupling side with respect to the shaft 25.

  Each outer convex portion 46 of the shaft 25 has a maximum width portion 52 (a portion indicating a circumferential width indicated by an arrow D1 in FIG. 13 described later) having a maximum circumferential width at the tip portion. Further, between the adjacent outer convex portions 46, the total width in the circumferential direction of the front end portion on the root side of the two adjacent core elements 54 and 56 on the radially inner side than the maximum width portion 52 is adjacent to the outer side. Legs 68 that are larger than the minimum circumferential width between the tips of the protrusions 46 are locked. A gap which is a finite minute gap is formed between the adjacent core elements 54 and 56, and at least the backlash reducing pin 88 is not inserted between them, the compressive stress and the tensile stress are applied between the adjacent core elements 54 and 56. It is made not to generate. In a state in which the backlash reducing pin 88 is pushed between the adjacent core elements 54 and 56, the backlash between the adjacent core elements 54 and 56 and the backlash between the shaft 25 and the rotor core 24 can be reduced by the backlash reduction pin 88.

  Further, each backlash reducing pin 88 is radially inward of the maximum width portion 52 of each outer convex portion 46 of the shaft 25, that is, radially inward from a broken line G in FIG. Arranged between the core elements 54 and 56.

Each of the core elements 54 and 56 has auxiliary salient poles 42 protruding from both sides in the circumferential direction, and the auxiliary salient poles of a plurality of adjacent core elements 54 and 56 are connected to each other via connecting pins 86 at the tip portions. Has been. Further, around the core elements 54 and 56, the common coils 30n and 30s, which are a part of the plurality of coils 28n, 28s, 30n, and 30s, are wound so as to be disposed radially inward of the auxiliary salient poles 42 . They have been times.

  According to such a rotor 14, a magnetic path through which most of the magnetic flux generated in the stator 12 passes does not pass through the shaft 25 in a configuration including a plurality of core elements 54 and 56 arranged at a plurality of locations in the circumferential direction. The magnetic resistance in the magnetic path can be reduced, and the performance of the rotating electrical machine 10 can be improved.

  This will be described with reference to FIG. FIG. 13 is an enlarged view corresponding to part G of FIG. 8 showing the flow of magnetic flux in the rotor of the present embodiment. As shown in FIG. 13, when a rotating electrical machine including the rotor 14 is in use, magnetic flux enters the salient pole 32 s (FIG. 7) of the rotor 14 from the stator 12 (FIG. 1), and the magnetic flux There is a case where it flows toward another salient pole 32n. In this case, in the present embodiment, the shaft 25 passes from one core element 56 forming one salient pole 32s to another core element 54 forming another salient pole 32n, as indicated by a broken line arrow in FIG. Without much, most of the magnetic flux flows along the magnetic path. Since the adjacent core elements 54 and 56 are in contact with each other at the rotor side base portions 62 and 82 in the circumferential direction, most of the magnetic flux flows through the contact portions. For this reason, the magnetic flux flowing in the rotor core 24 passes only once through a gap (a portion surrounded by a one-dot chain line P in FIG. 13) that is a minute gap existing in the contact portion along the magnetic path. Moreover, the adjacent core elements 54 and 56 can be formed of the same magnetic material having a low magnetic resistance, and the magnetic flux density does not change excessively in the middle of the magnetic path, so that eddy current loss can be reduced and the magnetic flux in the magnetic path can be reduced. Does not decrease excessively. For this reason, since the magnetic path through which most of the magnetic flux generated in the stator 12 passes does not pass through the shaft 25, the magnetic resistance in the magnetic path can be reduced, and the performance of the rotating electrical machine can be improved.

  On the other hand, FIG. 14 shows a rotor 14a of a comparative example deviating from the present invention. In the rotor 14a of the comparative example, outer concave portions 92 that are long in the axial direction are formed at a plurality of locations in the circumferential direction of the outer peripheral surface of the shaft 25 in the rotor 14 of this embodiment (FIG. 1 and the like). Each outer recess 92 has a width in the circumferential direction at the back that is greater than the opening. Further, in the rotor 14a of the comparative example, similarly to the rotor 14 of the present embodiment, the first core element 54a having the N pole forming salient pole 32n outside the shaft 25 and the second core having the S pole forming salient pole 32s. The elements 56a are alternately arranged in the circumferential direction, and the core elements 54a and 56a are connected to each other via a connecting pin 86 at the tip of the auxiliary salient pole 42.

  On the other hand, unlike the present embodiment, in the comparative example, an inner convex portion 94 that is fitted in the outer concave portion 92 of the shaft 25 in the axial direction is formed at the radially inner end of the root side end portion of each core element 54a, 56a. ing. That is, in the comparative example, the relationship between the concave portions and the convex portions provided in the shaft 25 and the core elements 54a and 56a is opposite to that of the present embodiment. Further, the core elements 54a and 56a adjacent to each other in the circumferential direction are not in contact with each other in the circumferential direction including the root portion on the shaft 25 coupling side. The radially inner side surfaces of the core elements 54 a and 56 a are in contact with the outer peripheral surface of the shaft 25. In such a comparative example, a case is considered where the magnetic flux generated by the stator flows from one salient pole 32s to another salient pole 32n, as indicated by a broken line arrow in FIG. In this case, the magnetic flux flows from one salient pole 32s to the shaft 25 and from the shaft 25 to another salient pole 32n. Therefore, the magnetic path through which a large amount of magnetic flux passes through the rotor 14 passes twice through the radial gap between the core elements 54a, 56a and the shaft 25, which is the gap surrounded by the circle γ in FIG. ing. Further, since the shaft 25 is required to have high rigidity, it is difficult to form the shaft 25 with the same magnetic material as the core elements 54a and 56a that are not required to have higher rigidity than the shaft 25. The shaft 25 and the core elements 54a and 56a Magnetic flux density changes greatly. For this reason, eddy current loss is likely to occur. Therefore, the magnetic resistance in the magnetic path is increased, and the loss is increased, which becomes a factor of reducing the performance of the rotating electrical machine including the rotor 14a. In the present embodiment, unlike the comparative example, since the magnetic path through which most of the magnetic flux passes does not pass through the shaft 25, such inconvenience can be eliminated.

  Further, in the present embodiment, unlike the case of the rotor of Patent Document 3, it is not necessary to engage the convex portion and the concave portion between the adjacent core elements 54 and 56, and the size can be reduced.

  In the present embodiment, the rotor core 24 is formed by connecting a plurality of core elements 54 and 56 in a ring shape. Corresponding coils 28n, 28s, 30n, and 30s can be easily wound around the poles 32n and 32s, and the space factor of the coils 28n, 28s, 30n, and 30s in the slot 34, that is, the filling rate is improved. Can be planned.

  Further, each outer convex portion 46 of the shaft 25 is formed with a maximum width portion 52 having a width D1 (FIG. 8) at which the width in the circumferential direction is maximum at the tip portion. Further, between the adjacent outer convex portions 46, the total width in the circumferential direction of the front end portion on the root side of the two adjacent core elements 54 and 56 on the radially inner side than the maximum width portion 52 is adjacent to the outer side. Legs 68 that are larger than the minimum circumferential width between the tips of the protrusions 46 are locked. For this reason, it is possible to effectively prevent the rotor core 24 from slipping out to the outside in the radial direction of the shaft 25 despite the centrifugal force acting on the rotor core 24 during use. That is, the outer convex portion 46 has a function of holding the rotor core 24 on the shaft 25 regardless of centrifugal force.

  Further, each backlash reducing pin 88 is radially inner than the maximum width portion 52 where the circumferential width of each outer convex portion 46 of the shaft 25 is maximum, and the core elements 54 and 56 adjacent to each other in the circumferential direction. It is arranged between. For this reason, it is possible to suppress an increase in the magnetic resistance in the magnetic path through which the magnetic flux flows from the stator 12 (FIG. 1) to the rotor 14 by the backlash reduction pins 88, and the fit between the shaft 25 and the rotor core 24. The backlash can be reduced, for example, by filling back the joints. Moreover, excessive stress can be prevented from acting on the rotor core 24 as in the case where the shaft 25 is fitted to the rotor core 24 without using the backlash reduction pin 88, and the magnetoresistance loss in the magnetic path is further reduced. it can. Further, when a centrifugal force acts on each of the core elements 54 and 56 at the time of use, for example, the outer convex portion 46 and the leg portion 68 are pressed against each other at a portion indicated by R in FIG. 13, and a solid line arrow Q is indicated in FIG. Each core element 54, 56 tends to deform in the direction. However, since the backlash reduction pin 88 is arranged in this deformation direction, this deformation can be prevented, and it is possible to effectively prevent the core elements 54 and 56 from being pulled out while suppressing the generation of excessive stress. Since excessive stress does not act on the core elements 54 and 56, the magnetic resistance in the magnetic path can be reduced.

  Further, each auxiliary salient pole 42 is inclined with respect to the circumferential direction so as to become radially outward from the base side, which is the connection side with each core element 54, 56, toward the tip. For this reason, when each auxiliary salient pole 42 is formed of a magnetic material, a required magnetic flux component of a spatial harmonic generated in the stator 12 according to the position of the tip portion of the auxiliary salient pole 42 is efficiently added. To the N pole forming salient pole 32n or the S pole forming salient pole 32s, and a large amount of magnetic flux is efficiently linked to the induction coils 28n and 28s disposed radially outside of the auxiliary salient pole 42. 10 torque and efficiency can be improved.

  As shown in FIG. 9, if an axial gap is formed between the tips of the auxiliary salient poles 42 between the core elements 54 and 56 adjacent in the slot 34, the auxiliary salient poles 42. Between the salient poles 32n and 32s adjacent to each other, a loop path is formed through which the magnetic flux that does not contribute to the torque of the rotating electrical machine 10 loops via the auxiliary salient pole 42 and the rotor yoke 33 (FIG. 7). Can be prevented. For this reason, many magnetic fluxes which come out of the stator 12 can be returned to the stator 12 through the rotor 14, and a torque can be improved.

Instead of such auxiliary salient poles 42, auxiliary projections made of a nonmagnetic material, which is a resin or a nonmagnetic metal, can be projected from the circumferential side surfaces of the core elements 54, 56. Even in this case, the common coils 30n and 30s can be arranged inside the adjacent auxiliary protrusions connected in each slot 34, and the common coils 30n and 30s can be more effectively prevented from falling off. In this case, all the coils being wound around a plurality of core elements 54, 56 may also be located radially inside the corresponding auxiliary protrusions. For example, electrically by cutting the coils to each other to be wound around the N pole formed salient poles 32n and an S pole forming salient pole 32s mutually at least adjacent, wound around the N pole formed salient poles 32n and an S pole forming salient pole 32s It is also possible to connect another diode between the coils.

  In addition, the circumferential maximum width D2 (FIG. 8) of the root portion of each outer convex portion 46 is set in the circumferential direction of the two core elements 54 and 56 disposed between the tip portions of the adjacent outer convex portions 46. It can also be made smaller than the minimum width D3 (FIG. 8). In such a configuration, the circumferential width of the leg portion 68 can be increased by a metal plate having a relatively low strength, while the circumferential width of the outer convex portion 46 of the shaft 25 having a relatively high strength while ensuring the strength. Can be reduced. For this reason, while reducing the size of the rotor 14, it is possible to increase the width of the magnetic path of the core elements 54 and 56 that become the magnetic path in contact with each other, and it is possible to secure the strength of each component without increasing the magnetic resistance. .

  15-17 is a figure which shows the result of having analyzed each of stress, magnetic flux density, and magnetic flux flow using the rotor 14 of this embodiment. FIG. 15 is a diagram showing a distribution of the compressive stress acting when the rotor 14 rotates, with a part in the circumferential direction of the rotor 14. A portion A indicated by a black background in FIG. 15 is a portion where the compressive stress is maximized, a portion B having a narrow interval between oblique lines, a portion C having a wide interval between oblique lines, a portion D indicated by sand, and a portion E indicated by a white background. In this order, the compressive stress decreases. Further, the flow of magnetic flux is indicated by an arrow η. As is clear from FIG. 15, high stress is generated in the shaft 25, and in the magnetic path through which the magnetic flux passes in each of the core elements 54 and 56 of the rotor core 24, the stress is excessively high, which causes deterioration of the magnetization characteristics. The part has not occurred. In addition, excessive stress is not generated at the base portions of the core elements 54 and 56 with respect to the centrifugal force, and the rotor core 24 and the coils can be held on the shaft 25.

  FIG. 16 is a diagram showing a magnetic flux density contour (contour line display) of the rotor corresponding to FIG. 13 when a magnetic flux flows from the stator into the rotor. A portion A indicated by a black background in FIG. 16 is a portion having the lowest magnetic flux density. A portion B having a narrow slanted line interval, a part C having a wide slanted line interval, a part D indicated by a sand background, and a part E indicated by a white background. The magnetic flux density is high. In FIG. 16, the backlash reducing pin 88 is formed of a nonmagnetic material (the same applies to FIG. 17 described later). As is apparent from FIG. 16 with reference to FIG. 13, the magnetic flux density in the rotor 14 does not change greatly in the magnetic path, and the magnetic flux density does not become excessively low.

  FIG. 17 is a diagram illustrating an analysis result of a part of the magnetic flux flow in the circumferential direction of the rotor when the magnetic flux flows from the stator into the rotor. In FIG. 17, the flow direction of magnetic flux is simplified by arrows. In the analysis result of FIG. 17, more magnetic flux flows in the rotor core 24 radially outward than the maximum width portion of the outer convex portion 46 of the shaft 25. As is apparent from the analysis result, most of the magnetic flux flowing through the rotor 14 does not pass through the shaft 25. Further, by forming the backlash reduction pin 88 from a non-magnetic material, magnetic flux does not pass through the backlash reduction pin 88, and loss such as eddy current loss is not increased.

  In the above-described embodiment, the case has been described in which the cross-sectional shape of the distal end portion of the outer convex portion 46 of the shaft 25 and the inner portion of the inner concave portion 70 of each core element 54, 56 is substantially oval. However, the present invention is not limited to this. For example, various shapes such as a substantially circular shape, a substantially triangular shape, a substantially rectangular shape, and a substantially rhombus shape can be adopted as the cross-sectional shape of the distal end portion of the outer convex portion 46 and the inner portion of each inner concave portion 70.

[Second Embodiment]
FIG. 18 is a perspective view showing a rotor core 24 constituting the rotor of the second embodiment of the present invention. FIG. 19 is a view showing a plurality of first metal plates 96 that constitute a part of the rotor core 24 in FIG. 18 in the axial direction. FIG. 20 is a view showing a plurality of second metal plates 60 that constitute a part of the rotor core 24 in FIG. 18 in the axial direction. FIG. 21 is a view showing a plurality of third metal plates 98 constituting a part in the axial direction of the rotor core 24 of FIG.

  As shown in FIG. 18, in the rotor core 24 constituting the rotor of the present embodiment, the first metal plate 58 having inclined protrusions 78 on both sides used in the first embodiment described above (FIG. 8, FIG. 8). 10) is not used. That is, the rotor core 24 is formed by a plurality of first metal plates 96 shown in FIG. 19, a plurality of second metal plates 60 shown in FIG. 20, and a plurality of third metal plates 98 shown in FIG. In the first metal plate 96 of FIG. 19, in the first metal plate 58, the inclined projecting portion 78 is projected from only one side surface in the circumferential direction of the body portion 76. In the third metal plate 98 of FIG. 21, the inclined protrusion 78 is protruded from only the other circumferential side surface of the body 76 in the first metal plate 58. On the other hand, the second metal plate 60 of FIG. 20 has the same shape as the second metal plate 60 used in the first embodiment.

  The rotor core 24 of FIG. 18 includes a first core element 54 and a second core element 56, each of which is a plurality of rotor core elements. In the rotor core 24, first core elements 54 having N-pole forming salient poles 32n and second core elements 56 having S-pole forming salient poles 32s are alternately arranged in the circumferential direction one by one and connected in an annular shape. It is formed by. Each of the core elements 54 and 56 includes a first metal plate 96, a second metal plate 60, and a third metal plate 98, which are sequentially stacked one by one, or repeated, or a plurality of first metal plates 96 and one sheet. The second metal plate 60 and a plurality of third metal plates 98 are sequentially stacked and repeated. In this case, the metal plates 96, 60, 98 arranged at the same position in the axial direction of the core elements 54, 56 are of the same type in the core elements 54, 56. And the laminated body of each metal plate 96, 60, 98 is arranged in cyclic | annular form, and the circumferential direction side surfaces of the rotor side base part 100 of an adjacent laminated body are contacted in the circumferential direction. Moreover, it arrange | positions so that the front-end | tip part of the inclination protrusion part 78 of the adjacent core elements 54 and 56 arrange | positioned in each slot 34 (FIG. 18) may overlap, seeing an axial direction, and mutually aligning the pin hole 85. ing. Thereby, the rotor core 24 is formed. In the rotor core 24, the first core elements 54 and the second core elements 56 are alternately arranged in the circumferential direction.

In a rotor not shown, an N pole induction coil 28n and an N pole common coil 30n (see FIG. 8 and the like) are wound around a first core element 54, and an S pole induction coil 28s and an S pole common coil are wound around a second core element 56. 30 s (see FIG. 8 etc.) is wound . A connecting pin 86 (see FIG. 8 or the like) is inserted into the pin hole 85 of the adjacent first core element 54 and second core element 56 aligned with each other. Further, the shaft 25 is fitted to the rotor core 24 so that the outer convex portion 46 of the shaft 25 (see FIG. 8 and the like) is fitted in the inner concave portion 70 of each core element 54, 56 in the axial direction. In this state, the rattling reduction pin 88 (FIG. 8 etc.) is provided on the substantially cylindrical pin engaging portion 87 formed by the semicircular portion 74 on the circumferential side surface of the rotor side base portion 100 between the adjacent core elements 54 and 56. Are inserted in the axial direction so as to spread out the respective leg portions 68.

  Also in the case of such a rotor, the shaft 25 has a magnetic path through which most of the magnetic flux generated in the stator 12 (see FIG. 1 and the like) passes through a configuration including a plurality of core elements 54 and 56 arranged at a plurality of locations in the circumferential direction. Therefore, the magnetic resistance in the magnetic path can be reduced and the performance of the rotating electrical machine can be improved. Other configurations and operations are the same as those in the first embodiment.

  In the present embodiment, the first metal plate 96 and the third metal plate 98 are formed of one type of metal plate having the same shape, and the first metal plate 96 and the third metal plate 98 are turned upside down. It can also be distinguished. Further, the second metal plate 60 may be omitted from the rotor core 24. For example, a plurality of laminated bodies are formed by alternately laminating the first metal plate 96 and the third metal plate 98 one by one or plural, and a rotor core is formed by connecting the plurality of laminated bodies in an annular shape. You can also

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

  10 Rotating machine, 12 Stator, 14, 14a Rotor, 16 Stator core, 18 Teeth, 20u, 20v, 20w Stator coil, 22 slots, 24 Rotor core, 25 Shaft, 26a, 26b End plate, 28n N pole induction coil, 28s S pole Inductive coil, 30n N pole common coil, 30s S pole common coil, 32n N pole formation salient pole, 32s S pole formation salient pole, 33 rotor yoke, 34 slots, 36 common coil set, 38 first diode, 40 second diode, 42 Auxiliary salient pole, 44 collar part, 46 outer convex part, 48 shaft side base part, 50 shaft side tip part, 52 maximum width part, 54, 54a first core element, 56, 56a second core element, 58 first Metal plate, 60 second metal plate, 62 first rotor side root, 6 4 First rotor side tip, 66 base, 68 legs, 70 inner recess, 72 wide part, 74 semicircular part, 76 body part, 78 inclined protrusion, 80 circumferential protrusion, 82 second rotor side root part , 84 Second rotor side tip, 85 pin hole, 86 connecting pin, 87 pin engaging portion, 88 backlash reduction pin, 90 recess, 92 outer recess, 94 inner protrusion, 96 first metal plate, 98 third metal Plate, 100 Rotor side root.

Claims (5)

A shaft including a plurality of convex portions provided on the outer peripheral surface;
A plurality of rotor core elements each including a concave portion in which a part of the plurality of convex portions is fitted in the axial direction, and the plurality of rotor core elements are arranged at a plurality of locations in the circumferential direction outside the shaft. The plurality of rotor core elements forming a rotor core coupled to the shaft,
And a plurality of coils that are wound around each rotor core element,
The rotor core elements adjacent to each other in the circumferential direction are in contact with each other in the circumferential direction at a rotor side root portion provided on the coupling side with respect to the shaft ,
A rotating electrical machine , wherein a backlash reducing pin is disposed between rotor core elements adjacent to each other in a radial direction with respect to a maximum width portion where a circumferential width of the convex portion is maximum. Rotor. A shaft including a plurality of convex portions provided on the outer peripheral surface;
A plurality of rotor core elements each including a concave portion in which a part of the plurality of convex portions is fitted in the axial direction, and the plurality of rotor core elements are arranged at a plurality of locations in the circumferential direction outside the shaft. The plurality of rotor core elements forming a rotor core coupled to the shaft,
A plurality of coils wound around each of the rotor core elements,
The rotor core elements adjacent to each other in the circumferential direction are in contact with each other in the circumferential direction at a rotor side root portion provided on the coupling side with respect to the shaft,
Each of the rotor core elements has auxiliary protrusions protruding from both sides in the circumferential direction,
The auxiliary protrusions of a plurality of adjacent rotor core elements are connected to each other at a tip portion,
Wherein around each rotor core element, said to be located radially inward of the auxiliary protruding portion, the rotating electric machine rotor, wherein at least a portion of the coil of said plurality of coils are wound. The rotor for a rotating electrical machine according to claim 2 ,
The plurality of coils are:
Wherein around each rotor core element, the inner coil which is wound so as to be positioned radially inwardly of the respective auxiliary protruding portion,
Wherein around each rotor core element, for a rotary electric machine rotor which comprises an outer coil which is wound so as to be disposed radially outwardly of the respective auxiliary protruding portion. In the rotor for a rotating electrical machine according to claim 2 or claim 3 ,
Each of the auxiliary protrusions is inclined with respect to the circumferential direction so as to become radially outward from the base side, which is a connection side to each of the rotor core elements, toward the tip. The rotor for a rotating electrical machine according to any one of claims 2 to 4 ,
A rotor for a rotating electrical machine, wherein at least some of the auxiliary protrusions are made of a magnetic material.

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