JP6544151B2 - Electric rotating machine - Google Patents

Description

  The present invention relates to a rotary electric machine including a stator having an armature coil that generates a magnetic flux by energization and a rotor that rotates by the passage of the magnetic flux.

  As a rotating electric machine mounted on a hybrid vehicle or the like, a rotating electric machine including a stator having an armature coil generating magnetic flux by energization and a rotor rotating by passage of magnetic flux is used.

  As a conventional rotary electric machine of this type, one described in Patent Document 1 is known. The rotary electric machine described in Patent Document 1 winds the rotor coil so that the winding direction is reversed on the adjacent rotor salient poles, and providing a rectifying element in the closed circuit of each rotor coil to induce the induced current flowing in the rotor coil. It rectifies in one direction. In addition, this rotary electric machine is provided with a transistor in a closed circuit, and the transistor cuts off or conducts an induced current.

  The rotary electric machine described in Patent Document 1 cuts off the induced current by the transistor when it leaves after the rotor salient pole faces the stator magnetic pole, so that the magnetic attraction force between the rotor salient pole and the stator magnetic pole is in the reverse direction of the rotor. It is possible to prevent the action and to improve the torque of the rotor.

JP, 2015-6103, A

  In a rotating electrical machine in which a rectifying element is provided on a rotor as in Patent Document 1, the diode holder holding the rectifying element has a function as a heat sink for radiating heat of the rectifying element and strength to endure centrifugal force when the rotor rotates. Is required.

  However, the conventional rotary electric machine is only considered about the structure which hold | maintains a rectification element by a diode holder, and there existed a possibility that the heat dissipation of the diode and the intensity | strength of a diode holder may be inferior via a diode holder.

  Then, an object of this invention is to provide the rotary electric machine which can improve the heat dissipation of a rectifier, and can improve the intensity | strength of the diode holder holding a rectifier.

One aspect of the invention of a rotating electrical machine that solves the above problems is a rotating electrical machine including a stator having an armature coil that generates a magnetic flux by energization and a rotor that rotates by passing the magnetic flux, wherein the rotor is A plurality of induction coils that generate an induction current by linking harmonic components superimposed on the magnetic flux, a plurality of field coils that generate an electromagnetic force by energizing the induction current, and the induction coil And a plurality of rectifying elements configured to rectify the induced current to be supplied to the field coil as a field current, and the induction coil and the field coil form a closed circuit with the rectifying element And the rectifying element is formed on the outer surface of the cover attached to the rotor so as to be attachable in a plurality of holders arranged around the rotation axis, and the cover is adjacent Between the holder and having a groove communicating with that.

  As described above, according to the present invention, the heat dissipation of the rectifying element can be improved, and the strength of the diode holder for holding the rectifying element can be improved.

FIG. 1 is a view showing a rotary electric machine according to an embodiment of the present invention, and is a cross-sectional view orthogonal to a rotation axis showing a half model of its schematic configuration. FIG. 2 is a connection diagram showing a connection closed circuit of diodes installed in the inner rotor. FIG. 3 is a cross-sectional view parallel to the rotation axis of the rotary electric machine according to an embodiment of the present invention. FIG. 4 is an exploded perspective view showing the outer rotor of the rotary electric machine according to one embodiment of the present invention. FIG. 5 is an exploded perspective view showing an inner rotor of a rotary electric machine according to an embodiment of the present invention. FIG. 6 is a view showing a rotating electrical machine according to an embodiment of the present invention, and is a front view of a rotor winding of an inner rotor as viewed from the other end side in the axial direction. FIG. 7 is a view showing a rotating electrical machine according to an embodiment of the present invention, and is a cross-sectional view in a plane passing through the rotation axis of the inner rotor. FIG. 8 is a view showing a rotating electrical machine according to an embodiment of the present invention, and is a perspective view showing one surface of a diode holder. FIG. 9 is a view showing a rotating electrical machine according to an embodiment of the present invention, and a perspective view showing the other surface of the diode holder. FIG. 10 is a view showing a rotating electrical machine according to an embodiment of the present invention, and is an exploded perspective view of a diode holder and a diode. FIG. 11 is a view showing a rotating electrical machine according to an embodiment of the present invention, and is an exploded perspective view of a diode holder and a balance plate. FIG. 12 is a view showing a rotating electrical machine according to an embodiment of the present invention, and a perspective view showing an assembled state of a diode holder and a balance plate.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1-12 is a figure explaining the rotary electric machine which concerns on one Embodiment of this invention.

  In FIG. 1, the rotary electric machine 1 is configured as a double-rotor type rotary electric machine, and has a cylindrical stator 100 and a second rotor provided closer to the rotary shaft 1C than the stator 100. An outer rotor 200 and an inner rotor 300 as a first rotor provided closer to the rotating shaft 1C than the outer rotor 200 are provided. The outer rotor 200 and the inner rotor 300 are supported so as to be relatively rotatable around the rotation axis 1C. FIG. 1 shows a radial cross-sectional view of 180 degrees (1/2) of the mechanical angle of 360 degrees. The inner rotor 300 constitutes a rotor in the present invention.

  The stator 100 is provided with a stator core 101. On the stator core 101, a plurality of stator teeth 102 extending in the radial direction toward the axial center are arranged in parallel in the circumferential direction. The stator teeth 102 are formed such that the inner circumferential surface 102 a side faces the outer circumferential surface 201 a of the magnetic path member 201 of the outer rotor 200 described later via the air gap G 1.

  In the stator 100, armature coils 104 corresponding to W-phase, V-phase, and U-phase of three-phase alternating current are accommodated with slots 103 between side surfaces 102b of the stator teeth 102. The armature coil 104 is wound around the stator teeth 102 by distributed winding. The armature coil 104 generates a magnetic flux by energization.

  The stator 100 generates a rotating magnetic field rotating in the circumferential direction by supplying a three-phase alternating current to the armature coil 104, and interlinks the generated magnetic flux with the outer rotor 200 and the inner rotor 300, thereby providing the outer rotor 200 and the outer rotor 200. The inner rotor 300 is rotationally driven.

  The outer rotor 200 has a magnetic path member 201 made of a soft magnetic material such as steel having high magnetic permeability and a nonmagnetic member 202 made of a nonmagnetic material impermeable to magnetic flux such as PPS (polyphenylene sulfide) resin. The magnetic path member 201 and the nonmagnetic member 202 are stretched in the axial direction. The axial direction indicates the same direction as the direction in which the rotation axis 1C extends.

  The magnetic path member 201 has a pole piece portion 201A facing the nonmagnetic member 202 in the circumferential direction, and a bridge portion 201B connecting the pole piece portions 201A adjacent on the stator side and the inner rotor side of the nonmagnetic member 202.

  The pole piece portion 201A and the bridge portion 201B are integrally formed. Therefore, the magnetic path member 201 is configured as an integral core in which the pole piece portion 201A and the bridge portion 201B are integrally formed. The magnetic path member 201 configured as an integral core is formed by laminating a plurality of electromagnetic steel plates in the axial direction.

  The nonmagnetic member 202 is provided in a space surrounded by the pole piece portion 201A and the bridge portion 201B. Therefore, in the outer rotor 200 of the present embodiment, the pole piece portions 201A of the soft magnetic material and the nonmagnetic members 202 are alternately arranged in the circumferential direction. The detailed configurations of the magnetic path member 201 and the nonmagnetic member 202 will be described later.

  In the outer rotor 200, the outer peripheral surface 201a and the inner peripheral surface 201b of the magnetic path member 201 face the inner peripheral surface 102a of the stator teeth 102 of the stator 100 and the outer peripheral surface 302a of the rotor teeth 302 of the inner rotor 300 described later. It is formed as.

  In the outer rotor 200, the magnetic flux generated and linked by the armature coil 104 of the stator 100 efficiently passes through the pole piece portion 201A of the magnetic path member 201, while the nonmagnetic member 202 prevents the magnetic flux from passing. After passing through the pole piece portion 201A of the outer rotor 200, the magnetic flux generated by the armature coil 104 of the stator 100 interlinks with the outer peripheral surface 302a of the rotor teeth 302 of the inner rotor 300, as described later. By passing through the pole piece portion 201A of the outer rotor 200, a magnetic circuit returning to the stator 100 is formed.

  At this time, since the outer rotor 200 rotates relative to the stator 100, the pole piece portion 201A of the magnetic path member 201 for passing the magnetic flux and the nonmagnetic member 202 for limiting the passing of the magnetic flux are repeatedly switched to form a magnetic circuit. Form.

  By rotating the outer rotor 200 in this manner, the number of poles and the frequency of the rotating magnetic field generated by the armature coil 104 can be changed. The synchronous rotation of the modulated rotating magnetic field and the inner rotor 300 generates a torque.

  The inner rotor 300 includes a rotor core 301 in which a plurality of electromagnetic steel plates are stacked in the axial direction. In the rotor core 301, a plurality of rotor teeth (salient pole portions) 302 extended in the radial direction away from the axial center are arranged in parallel in the circumferential direction. The rotor teeth 302 are formed such that the outer peripheral surface 302a faces the inner peripheral surface 201b of the magnetic path member 201 of the outer rotor 200 via the air gap G2.

  The rotor teeth 302 have a rotor winding 330 composed of an induction coil I and a field coil F. The induction coil I is wound around the outer rotor 200 of the rotor teeth 302 with the slots 303 between the side surfaces 302 b of the adjacent rotor teeth 302. The field coil F is wound around the axial center side of the rotor teeth 302 as a slot 303 between the side surfaces 302 b of the adjacent rotor teeth 302. That is, the induction coil I is wound radially outward of the inner rotor 300 in the slot 303, and the field coil F is wound radially inward of the inner rotor 300 in the slot 303. A rotor winding 330 comprising an induction coil I and a field coil F constitutes a coil in the present invention.

  The induction coil I is formed in a concentrated winding in which the adjacent winding turns in opposite directions in the circumferential direction of the inner rotor 300 for each rotor tooth 302, and is arranged in the circumferential direction of the inner rotor 300. The induction coil I generates (induces) an induced current by linking magnetic fluxes.

The field coils F are formed so as to form concentrated windings each having an opposite turn in the circumferential direction of the inner rotor 300 for each rotor tooth 302, and are arranged in the circumferential direction of the inner rotor 300. The field coil F is excited by being supplied with a field current and functions as an electromagnet.
Thus, the induction coil I and the field coil F are wound so that the directions of the currents are equal.

  Here, the eight induction coils I for the mechanical angle of 180 degrees in FIG. 1 are distinguished by being called induction coils I1 to I8 in the rotational direction (counterclockwise direction). Also, the eight field coils F for 180 mechanical angles are distinguished as being called field coils F1 to F8 in the rotational direction.

  In FIG. 2, induction coils I1, I3, I5, I7 and field coils F1, F2, F3, F4 form a rectifier circuit C1 which is a closed circuit together with diodes D1, D2. In this rectifier circuit C1, every third induction coil I1, I5 and diode D1 are connected in series, every third induction coil I3, I7 and diode D2 are connected in series, and field coils F1, F2, F3, F4 Are connected in series. The series connection of the induction coils I1 and I5 and the diode D1 and the series connection of the induction coils I3 and I7 and the diode D2 are connected in parallel at both ends and then the field coil on the cathode side of the diodes D1 and D2. It is connected to the series connection which consists of F1, F2, F3, and F4. Thus, the rectifier circuit C1 rectifies the alternating current induced current generated by the induction coils I1, I3, I5 and I7 in one direction with the diodes D1 and D2, respectively, to direct the direct current to the field coils F1, F2, F3 and F4. It has a circuit configuration connected to supply as a field current.

  The induction coils I2, I4, I6, I8 and the field coils F5, F6, F7, F8 form a rectifier circuit C2 which is a closed circuit together with the diodes D3, D4. In this rectifier circuit C2, every third induction coil I2, I6 and diode D3 are connected in series, every third induction coil I4, I8 and diode D4 are connected in series, and field coils F5, F6, F7, F8 Are connected in series. The series connection of the induction coils I2 and I6 and the diode D3 and the series connection of the induction coils I4 and I8 and the diode D4 are connected in parallel at both ends, and then the field coil F5 is formed on the cathode side of the diodes D3 and D4. , F6, F7, and F8 are connected in series. Thus, the rectifier circuit C2 rectifies the alternating current induced current generated by the induction coils I2, I4, I6 and I8 in one direction with the diodes D3 and D4, respectively, to direct the field coils F5, F6, F7 and F8 to DC It has a circuit configuration connected to supply as a field current.

  With this circuit configuration, it is possible to rectify the induction current generated by the induction coil I and excite the field coil F as a field current, so that the rotor teeth 302 can function as an electromagnet.

  Here, the diodes D1, D2, D3 and D4 are used in series even when the induction coil I and the field coil F are multipolarized, and the number of diodes D1, D2, D3 and D4 is reduced in series by connecting in series. Neutral point clamp half-wave rectification that connects by 180 degrees phase difference and inverts one of the induced current to form half-wave rectification output instead of forming an H-bridge full-wave rectification circuit Form a circuit.

  The field coils F of the rectifier circuits C1 and C2 are reversed in the winding direction for each of the adjacent rotor teeth 302. From this, one of the rotor teeth 302 of the inner rotor 300 that constitutes a part of the magnetic circuit is magnetized so as to function as an electromagnet that faces the S pole in the direction guided from the pole piece portion 201A of the outer rotor 200. . Further, the other adjacent rotor teeth 302 are magnetized so as to function as an electromagnet that causes an N pole in a direction to guide the magnetic flux to the outer rotor 200 side.

  Here, the principle of torque generation of the rotary electric machine 1 will be described. Among the magnetic fluxes interlinked from the stator 100 via the outer rotor 200, the magnetic flux modulated by the rotation of the outer rotor 200 interlinks in synchronization with the rotation of the inner rotor 300.

  On the other hand, in the rotating electrical machine 1, the magnetic flux linked to the induction coil I of the inner rotor 300 contains a component that is not modulated by the outer rotor 200 (that is not synchronized with the rotation of the inner rotor 300), Thereby, an induction current of alternating current can be generated in the induction coil I. Then, the AC induction current is rectified by the diodes D1 and D2 to be a DC field current, and the field coil F is energized to cause the rotor teeth 302 to function as an electromagnet to generate a field magnetic flux. it can. Thus, the rotary electric machine 1 can generate torque.

  At this time, the magnetic flux interlinked from the stator teeth 102 of the stator 100 to the rotor teeth 302 of the inner rotor 300 through the pole piece portion 201A of the outer rotor 200 supplies power from the AC power supply to the distributedly wound armature coil 104. generate.

  By the way, although this armature coil 104 adopts distributed winding in the present embodiment, concentrated winding may be adopted. When concentrated winding is employed, more harmonic components can be superimposed on the magnetic flux linked to the rotor teeth 302 than in the case of the distributed winding coil. The harmonic component superimposed on the magnetic flux acts as a fluctuation in the amount of magnetic flux, so that an induction current can be effectively generated in the induction coil I, and a larger field current is supplied to the field coil F. Field flux can be generated.

  From these things, the rotary electric machine 1 can relatively rotate the inner rotor 300 by electromagnet torque (rotational force) without providing a permanent magnet. In this inner rotor 300, a chain is formed between the outer rotor 200 and the stator 100 by causing the rotor teeth 302 to function as electromagnets arranged in parallel so that the magnetization directions (N and S poles) alternate in the circumferential direction. The magnetic flux to be exchanged can be smoothly diverted around the slot 303 and delivered.

  In the electric rotating machine 1, the outer rotor 200 rotates relative to the stator 100, and the inner rotor 300 where the magnetic flux passing through the rotating outer rotor 200 (magnetic path member 201) is linked is relatively rotated by the electromagnet torque. Therefore, the outer rotor 200 can be rotated at low speed, and the inner rotor 300 can be rotated at high speed. Also, conversely, the outer rotor 200 can be rotated at high speed, and the inner rotor 300 can be rotated at low speed.

According to the structure of the stator 100, the outer rotor 200, and the inner rotor 300, the rotary electric machine 1 generates torque necessary for the above-described rotational drive. Specifically, the number of pole pairs of the armature coil 104 of the stator 100 is A, the number of pole piece portions 201A as the number of poles of the outer rotor 200 is H, and the number of pole pairs of the inner rotor 300 is When the number of pole pairs is P, the combination is such that the following equation (1) holds.
H = | A ± P | (1)

  In this structure, torque can be effectively generated to rotate the outer rotor 200 and the inner rotor 300 relative to the stator 100 efficiently. For example, in rotating electric machine 1 of the present embodiment, the number of poles A = 4 of armature coil 104 of stator 100, the number of poles H of outer rotor 200 H = 12, and the number of poles P = 8 of rotor teeth 302 of inner rotor 300. Yes, and satisfies the above equation (1).

  As shown in FIG. 3, in the rotary electric machine 1, the outer rotor 200 is rotatably accommodated in the stator 100, and the inner rotor 300 is rotatably accommodated in the outer rotor 200.

  Further, an outer rotation shaft 210 is connected to the magnetic path member 201 of the outer rotor 200 so as to be integrally rotatable. An inner rotation shaft 310 is coupled to the rotor core 301 of the inner rotor 300 so as to be integrally rotatable. Thus, the rotary electric machine 1 is configured as a magnetic modulation type two-axis motor capable of transmitting power to each of the outer rotation shaft 210 and the inner rotation shaft 310 by using the magnetic modulation principle.

  Therefore, the rotary electric machine 1 can function, for example, the stator 100 as a sun gear of a planetary gear mechanism, the outer rotor 200 as a carrier of a planetary gear mechanism, and the inner rotor 300 as a ring gear of a planetary gear mechanism. It can be equipped with functions. The rotary electric machine 1 according to the present embodiment is configured such that the outer rotor 200 functions as a carrier.

  With this structure, for example, when the rotary electric machine 1 is mounted as a drive source together with an engine (internal combustion engine) in a hybrid vehicle, the power transmission path of the vehicle is the outer rotary shaft 210 of the outer rotor 200 and the inner rotary shaft 310 of the inner rotor 300, respectively. By connecting the vehicle battery directly to the armature coil 104 of the stator 100 via the inverter, the motor 100 can also function as a power transmission mechanism together with the drive source.

(Outer rotor)
3 and 4, in addition to the magnetic path member 201 and the nonmagnetic member 202 described above, the outer rotor 200 includes an outer rotary shaft 210 made of iron material, an annular flange 215, and a cylindrical cylindrical shaft 214. Have.

  The outer rotary shaft 210 includes a cylindrical small diameter portion 210A and a flange-shaped large diameter portion 210B continuous with the other end of the small diameter portion 210A. The large diameter portion 210B is formed such that the radial direction around the rotation shaft 1C is larger than the radial direction of the small diameter portion 210A, and the large diameter portion 210B faces the magnetic path member 201 at the other end side in the axial direction.

  A resolver ring 221, a resolver rotor 220, and a retainer 218 are provided on the small diameter portion 210A of the outer rotation shaft 210 from one end to the other end in the axial direction. The resolver rotor 220 is integrally rotatably fixed to the small diameter portion 210A by a resolver ring 221.

  The retainer 218 is formed in an annular shape, and supports the outer ring of the radial ball bearing 21 described later on the side surface on the one end side in the axial direction of the inner edge portion. Further, the retainer 218 is provided with a nut portion 218A, and a bolt 26 described later is screwed into the nut portion 218A.

  The flange 215 is provided between the large diameter portion 210 B of the outer rotary shaft 210 and the magnetic path member 201 and the nonmagnetic member 202. The flange 215 is made of, for example, a nonmagnetic material such as an aluminum material. Thereby, the magnetic flux generated by the armature coil 104 is prevented from flowing as the leakage magnetic flux to the outer rotary shaft 210 made of iron material.

  A plurality of insertion holes 210B1 and 215A aligned in the circumferential direction are respectively formed in the large diameter portion 210B and the flange 215, and nonmagnetic bolts 219 are inserted through the insertion holes 210B1 and 215A. An insertion hole 202A is formed in the nonmagnetic member 202, and a nonmagnetic bolt 219 is inserted through the insertion hole 202A.

  The nonmagnetic bolt 219 is made of a nonmagnetic material that does not pass magnetic flux, such as PPS (polyphenylene sulfide) resin. Therefore, in the outer rotor 200, permeance fluctuation (salient pole) occurs due to each pole piece portion 201A as compared to the case where each pole piece portion 201A (see FIG. 1) is magnetically independent and the nonmagnetic bolt 219 is made of magnetic material. Ratio can be increased. Thereby, the torque density in the rotary electric machine 1 is improved.

  Further, since the nonmagnetic bolt 219 is formed of a nonmagnetic substance, it is generated between the eddy current generated in the nonmagnetic bolt 219 and the nonmagnetic bolt 219 due to harmonic flux generated in the gap. It is possible to reduce the loss due to the eddy current.

  The cylindrical shaft 214 is provided on the other end side (left end side in FIG. 3) of the magnetic path member 201 and the nonmagnetic member 202 in the axial direction, and an axial line of the nonmagnetic bolt 219 is provided on the cylindrical shaft 214. A female screw 214A is formed in which the other end of the direction is screwed.

  The cylindrical shaft 214 is made of, for example, nonmagnetic stainless steel. As a result, the magnetic flux generated by the armature coil 104 is prevented from flowing as leakage magnetic flux to the outside through the cylindrical shaft 214.

  In the outer rotor 200, the nonmagnetic bolt 219 is inserted sequentially from the other end side in the axial direction into the insertion hole 210B1 of the large diameter portion 210B, the insertion hole 215A of the flange 215, and the insertion hole 202A of the nonmagnetic member 202. The flange 215 and the outer rotary shaft 210 are fixed to one end side (right end side in FIG. 3) of the magnetic path member 201 and the nonmagnetic member 202 in the axial direction by screwing to the female screw 214A of The cylindrical shaft 214 is fixed to the other end side in the axial direction of the member 201 and the nonmagnetic member 202.

(Inner rotor)
In FIGS. 3 and 5, the inner rotor 300 is provided with an inner rotation shaft 310 made of iron material. The balance plate 311, the spacer 312, the rotor winding 330, the spacer 314, the diode holder 315, the balance plate 316, U are arranged on the outer peripheral portion of the inner rotation shaft 310 from one end to the other end in the axial direction. A nut 317, a retainer 318, a resolver rotor 319, and a resolver ring 320 are provided.

  The balance plate 311 is formed by forming an iron material in an annular shape, and is positioned in the axial direction by the flange portion of the inner rotation shaft 310 at the inner peripheral edge portion. The balance plate 311 supports the rotor winding 330 via the spacer 312 from the one end side (right end side in FIG. 3) of the rotor winding 330 in the axial direction.

  The spacer 312 is interposed between one end of the rotor winding 330 in the axial direction and the balance plate 311. The spacer 312 is formed such that the radial direction about the rotation axis 1 C is smaller than the radial direction of the rotor winding 330, and a space is formed between the rotor winding 330 and the balance plate 311. The spacer 312 is made of an aluminum material formed in an annular shape. The balance plate 311 and the spacer 312 are locked against the inner rotation shaft 310 so as to rotate integrally with the rotor winding 330.

  The balance plate 316 is formed of an iron material in an annular shape, and is positioned in the axial direction by the U-nut 317 at the inner peripheral edge portion. The balance plate 316 supports the rotor winding 330 through the diode holder 315 and the spacer 314 from the other end side (the left end side in FIG. 3) of the rotor winding 330 in the axial direction.

  The spacer 314 is interposed between the other axial end of the rotor winding 330 and the diode holder 315. The spacer 314 is formed smaller in size in the radial direction centering on the rotation axis 1 C than the rotor winding 330, and forms a space between the rotor winding 330 and the diode holder 315. The spacer 314 is made of an aluminum material formed in an annular shape.

  The diode holder 315 is formed of a circuit board formed in an annular shape, and holds the diodes D1 to D4 described above. The balance plate 316, the diode holder 315 and the spacer 314 are fixed to the inner rotation shaft 310 so as to rotate integrally with the rotor winding 330.

  The U nut 317 has a female screw (not shown) formed on the inner peripheral surface, and is screwed with a male screw (not shown) formed on the outer peripheral surface of the inner rotation shaft 310. The U-nut 317 is screwed to the inner rotation shaft 310, whereby the rotor winding 330 is sandwiched by the balance plates 311 and 316 from both sides in the axial direction via the spacers 312 and 314 and the diode holder 315. It is fixed in the axial direction and in the rotational direction with respect to the rotation axis 310.

  The retainer 318 is formed in an annular shape, and supports an outer ring of a radial ball bearing 23 described later on the side surface of the other end side (the left end side in FIG. 3) of the inner edge portion in the axial direction. Further, a nut portion 318A is provided on one axial end side (the right end side in FIG. 3) of the outer edge of the retainer 318, and a bolt 25 described later is screwed into the nut portion 318A. .

(Overall structure including the case)
In FIG. 3, the rotary electric machine 1 includes a case 10, and the above-described stator 100, the outer rotor 200, and the inner rotor 300 are accommodated in the case 10.

  The case 10 includes a first flange 11, a first spacer 12, a first case 13, a second case 14, a second spacer 15, and a second flange 16 in the axial direction from one end to the other end. ing.

  The first case 13 includes a disk-like plate portion 13A and a cylindrical portion 13B which is continuous with the other end of the outer edge of the plate portion 13A. A through hole 13C is formed at the center of the plate portion 13A, and a small diameter portion 210A of the outer rotary shaft 210 penetrates through the through hole 13C.

  The stator 100 is fixed to the inner peripheral surface of the cylindrical portion 13B. Further, the cylindrical portion 13 B radially faces the magnetic path member 201 and the nonmagnetic member 202 of the outer rotor 200, and the rotor core 301 and the rotor winding 330 of the inner rotor 300.

  In this manner, the stator 100 which is the main part of the rotary electric machine 1, the magnetic path member 201 and the nonmagnetic member 202 of the outer rotor 200, and the rotor core 301 and the rotor winding of the inner rotor 300 And 330 are accommodated.

  Radial ball bearings 21 are provided in the through holes 13C. The radial ball bearing 21 is positioned in the axial direction by inserting the bolt 26 into the plate portion 13A of the first case 13 from one end in the axial direction and screwing it into the nut portion 218A of the retainer 218. The plate portion 13A of the first case 13 rotatably supports the small diameter portion 210A of the outer rotation shaft 210 via the radial ball bearing 21.

  Further, the resolver sensor 31 is fixed to the through hole 13C. On the other hand, an annular resolver rotor 220 is provided on the small diameter portion 210A of the outer rotation shaft 210 so as to radially face the resolver sensor 31. The resolver rotor 220 is integrally rotatably fixed to the small diameter portion 210A of the outer rotation shaft 210 by a resolver ring 221.

  The resolver sensor 31 detects the rotation angle of the resolver rotor 220 to detect the rotation angle of the outer rotor 200.

  The second case 14 includes a cylindrical outer cylinder portion 14A, a cylindrical inner cylinder portion 14B disposed on the inner peripheral side of the outer cylinder portion 14A, and axial directions of the outer cylinder portion 14A and the inner cylinder portion 14B. It has the disk shaped plate part 14C which follows the other end side.

  The first case 13 and the second case 14 are formed by joining together the cylindrical portion 13B of the first case 13 and the outer cylindrical portion 14A of the second case 14 in the axial direction and fastening them with bolts (not shown). It is connected in the state which accommodated 200 and the inner rotor 300. As shown in FIG.

  The outer cylindrical portion 14A is radially opposed to the other axial end of the cylindrical shaft 214 of the outer rotor 200, and rotatably supports the cylindrical shaft 214 via the radial ball bearing 22.

  Here, the outer rotor 200 according to the present embodiment has a cup type structure in which the magnetic path member 201 and the nonmagnetic member 202 are fixed to the large diameter portion 210B of the outer rotation shaft 210 at one end in the axial direction. .

  When the cup-shaped outer rotor 200 is supported, for example, in a cantilever manner with respect to the first case 13, when natural vibration occurs, the electromagnetic attraction force acting on the outer rotor 200 and natural vibration of the outer rotor 200 resonate. When an excessive force acts, the electromagnetic vibration becomes large. Further, when the outer rotor 200 is driven eccentrically, an excessive load is applied to the cantilevered radial ball bearing, which affects the durability of the radial ball bearing.

  Therefore, in the present embodiment, the other end side of the outer rotor 200 in the axial direction, that is, the cylindrical shaft 214, is radially more centered on the rotation shaft 1C than the radial ball bearing 21 supporting the outer rotation shaft 210. The second case 14 is supported by the radial ball bearing 22 having a large size.

  Thus, the outer rotor 200 according to the present embodiment can have a double-supported support structure, and can prevent the increase in the electromagnetic vibration as described above and the excessive load due to the eccentric drive on the radial ball bearing 21. can do.

  A resolver sensor 32 is fixed to the inner periphery of the inner cylindrical portion 14B. On the other hand, an annular resolver rotor 319 is provided on the inner rotation shaft 310 so as to radially face the resolver sensor 32. The resolver rotor 319 is integrally rotatably fixed to the inner rotation shaft 310 by a resolver ring 320.

  The resolver sensor 32 detects the rotation angle of the inner rotor 300 by detecting the rotation angle of the resolver rotor 319.

  A radial ball bearing 23 is provided on the inner circumference of one end in the axial direction of the inner cylindrical portion 14B. The radial ball bearing 23 is positioned in the axial direction by inserting the bolt 25 into the inner cylindrical portion 14B from the other end in the axial direction and screwing it into the nut portion 318A of the retainer 318. The inner cylindrical portion 14 B of the second case 14 rotatably supports the inner rotation shaft 310 via the radial ball bearing 23.

  A radial ball bearing 24 is provided on the inner periphery of the large diameter portion 210 </ b> B of the outer rotary shaft 210. The large diameter portion 210 </ b> B rotatably supports one end of the inner rotation shaft 310 via the radial ball bearing 24.

  A through hole 12A is formed in the first spacer 12, and a wire 31A extending from the resolver sensor 31 passes through the through hole 12A. Further, the first spacer 12 is interposed between the first case 13 and the first flange 11 to secure a space through which the wiring 31 A passes between the first case 13 and the first flange 11. ing.

  A through hole 15A is formed in the second spacer 15, and a wire 32A extending from the resolver sensor 32 passes through the through hole 15A. Further, the second spacer 15 is interposed between the second case 14 and the second flange 16 to secure a space through which the wiring 32A passes between the second case 14 and the second flange 16. ing.

  The first flange 11 is fixed to an end of the first case 13 in the axial direction via a cylindrical first spacer 12 by a bolt (not shown). The first flange 11 is formed in a flange shape having a larger dimension in the radial direction centering on the rotation shaft 1C than the first case 13 and is fixed to the vehicle body of the vehicle by a bolt not shown.

  On the inner peripheral side of the first flange 11, a coupling 33 is provided at one axial end of the small diameter portion 210A of the outer rotary shaft 210. For example, a drive shaft of a vehicle (not shown) is connected to the small diameter portion 210 </ b> A of the outer rotation shaft 210 via a coupling 33. The rotation of the outer rotary shaft 210 is transmitted to the drive shaft of the vehicle via the coupling 33.

  The second flange 16 is fixed to the other end side in the axial direction of the second case 14 via a cylindrical second spacer 15 by a bolt (not shown). The second flange 16 is formed in a flange shape having a larger dimension in the radial direction centering on the rotation shaft 1C than the second case 14, and is fixed to the vehicle body of the vehicle by a bolt not shown.

A coupling 34 is provided on the other end of the inner rotor 300 in the axial direction of the inner rotor 300 on the inner peripheral side of the second flange 16, and the other end of the coupling 34 may be, for example, a vehicle The engine output shaft is connected. The rotation of the engine is transmitted to the inner rotation shaft 310 via the coupling 34.
In the rotary electric machine 1 of the present embodiment, the drive shaft of the vehicle is connected to the outer rotary shaft 210, and the output shaft of the engine is connected to the inner rotary shaft 310. The output shaft of the engine may be connected to the outer rotation shaft 210, and the drive shaft of the vehicle may be connected to the inner rotation shaft 310.

(About insulator)
In the rotary electric machine 1 configured in this manner, when the inner rotor 300 is directly connected to the output shaft of the engine, the vibration of the engine is transmitted to the inner rotor 300 along the output shaft, and the rotor winding 330 of the inner rotor 300 vibrates. In particular, the rotor winding 330 vibrates largely when resonance occurs.

  When the rotor winding 330 vibrates, there is a possibility that the film of the rotor winding 330 may be rubbed and broken with the rotor teeth 302 made of electromagnetic steel sheet. When the film of the rotor winding 330 is broken, the rotor winding 330 is grounded.

  So, in this embodiment, in FIG. 6, the inner rotor 300 is provided with the insulator 340 which consists of resin etc. which have electrical insulation between the rotor teeth 302 and the rotor winding 330 in FIG.

  The insulator 340 holds the rotor winding 330 in a state of being wound outward in advance, and is mounted for each rotor tooth 302. This prevents the rotor winding 330 from coming into direct contact with the rotor teeth 302, so that the film of the rotor winding 330 is prevented from being rubbed against the rotor teeth 302 and broken. In the present embodiment, the rotor teeth 302 do not have the ridges at the tip like the rotor teeth of the conventional rotary electric machine, and are formed to have the same cross-sectional shape at the tip and base or to be gradually enlarged. ing.

  As a result, among the magnetic flux generated in stator 100 and linked to induction coil I of inner rotor 300, asynchronous magnetic flux fluctuating without being synchronized with the rotation of inner rotor 300 is prevented from being blocked by the ridge portion of rotor teeth 302. The induction current can be efficiently generated in the induction coil I. Further, the insulator 340 can be attached to the rotor teeth 302 from the radially outer side.

  The insulator 340 has a cylindrical portion (not shown) which is a shaft around which the rotor winding 330 is wound, and a flange portion 342 provided at an outer end in the rotor radial direction of the cylindrical portion.

  The induction coil I is wound on the outer side in the rotor radial direction of the cylindrical portion with a gap from the flange portion 342. A field coil F is wound on the radially inner peripheral side of the cylindrical portion 341 in the rotor radial direction.

  The flange portion 342 is formed to extend in the circumferential direction along the outer peripheral surface of the inner rotor 300 from the end portion of the cylindrical portion 341 on the outer side in the rotor radial direction. Further, the collar portion 342 also extends in the axial direction, and the extending portion is formed such that the length in the axial direction is larger than the length in the circumferential direction.

  The insulator 340 is attached to the rotor teeth 302 from the radially outer side in a state of the cassette bobbin in which the induction coil I and the field coil F are wound.

  As described above, the insulator 340 can be attached to the rotor teeth 302 of the rotor core 301 from the radially outer side with respect to the rotor teeth 302 in a state in which the rotor winding 330 is wound. Therefore, in addition to the effect that the film of the rotor winding 330 is protected, the effect that the assemblability of the inner rotor 300 is improved is also exhibited.

(About the diode holder)
Next, the detailed configuration of the diode holder 315 will be described. In FIG. 7, the inner rotor 300 has a diode holder 315 on the other end side of the rotor winding 330. Further, on the other end side of the diode holder 315, a balance plate 316 is provided. The diode holder 315 constitutes a cover in the present invention. The balance plate 316 constitutes the plate in the present invention.

  In FIG. 8 and FIG. 9, a diode accommodating portion 315A is formed on the outer surface on the other end side of the diode holder 315, that is, the outer surface on the side facing the balance plate 316. The diode accommodating portion 315A is formed in a rectangular concave shape capable of accommodating the rectangular diode D, and four diode accommodating portions 315A are arranged at intervals of 90 ° around the rotation axis 1C. The four diode accommodating portions 315A are all formed at the same depth, and the bottom surfaces thereof are in the same plane. The diode housing portion 315A constitutes a holder in the present invention.

  Further, the diode holder 315 is provided with a groove 315B for communicating the adjacent diode accommodating portions 315A in the same plane. Therefore, the bottom surfaces of all the diode accommodating portions 315A and the bottom surfaces of the grooves 315B are in the same plane. The groove 315B is formed to connect two corners on the inner peripheral side of the diode housing portion 315A.

  In FIG. 10, a diode D as a rectifying element is formed in a rectangular shape and has three terminals Da. The diode D is formed by connecting and integrating a pair of diodes D1 and D2 used in the rectification circuit C1 or a pair of diodes D3 and D4 used in the rectification circuit C2 in a center tap system of cathode common. The diode D is formed smaller than the diode accommodating portion 315A so as to be attachable in the diode accommodating portion 315A in a loosely fitted manner.

  In the diode D, a bolt insertion hole Dh through which a bolt 360 is inserted is formed. On the other hand, the diode holder 315 is formed with a female screw 315E in which a bolt 360 is screwed.

  In FIG. 11, the diode D is fastened to the diode holder 315 by inserting the bolt 360 into the bolt insertion hole Dh and screwing it to the female screw 315E in a state of being accommodated in the diode accommodation portion 315A.

  As described above, since the diode D is attached to the diode accommodation portion 315A of the diode holder 315 in a close fit state, a gap is generated between the diode D and the diode accommodation portion 315A.

  In the present embodiment, a molding material (not shown) made of resin or the like is poured into the gap between the diode D and the diode housing portion 315A, and the diode D is integrated with the diode holder 315 by this molding material.

  In the injection step of the molding material, the molding material is poured into each of the diode housings 315A in such a manner that the diode housings 315A open upward. Then, the mold material flows through the grooves 315B between the diode accommodating portions 315A adjacent to each other.

  As a result, the mold material evenly distributes to all the diode accommodating portions 315A by flowing through the groove 315B, so that the gap with the diode D can be uniformly filled with the mold material.

  In addition, the diode D is integrated with the diode holder 315 without a gap by the molding material, so that the heat generated by the diode D can be efficiently transmitted to the diode holder 315. The generated heat can be dissipated, and the heat dissipation of the diode D can be improved.

  Further, by integrating the diode D into the diode holder 315 without a gap by the molding material, the strength of the diode holder 315 in which the diode D is integrated can be improved.

  Here, in the present embodiment, since the diode housing portion 315A is formed on the other end side of the diode holder 315, the induction coil I and the field coil F disposed on the one end side of the diode holder 315 It is necessary to wire the lead wire to the side of the diode holder 315 by a short route without grounding to the middle of the wire and to wire to the diode D.

  Therefore, in FIG. 8, FIG. 9, and FIG. 10, the diode holder 315 has a wire connection area 315C on the side where the diode accommodation portion 315A is formed. The connection region 315C is provided adjacent to the diode accommodation portion 315A, and the three terminals Da of the diode D are disposed.

  In addition, an insertion hole 315D is provided in the connection region 315C, and the lead wire of the induction coil I and the field coil F constituting the rotor winding 330 is passed through the insertion hole 315D. Three insertion holes 315D are provided in each wire connection area 315C, and the outer peripheral edge of the diode holder 315 penetrates one end side and the other end side in the axial direction.

  The conductors of the induction coil I and the field coil F axially pass through the insertion hole 315D from the back side (one end side of the rotary electric machine 1) to the front side (the other end side of the rotary electric machine 1) of FIG. Thereafter, it is connected to the terminal Da of the diode D in the connection area 315C. With such a structure, the rotor winding 330 and the diode D can be reliably connected without grounding.

  In the diode holder 315 configured as described above, the centrifugal force or vibration at the time of rotation of the inner rotor 300 acts to cause the diode D to pop out from the diode accommodating portion 315A in the axial direction of the rotary electric machine 1. The diode D also generates heat on the surface on which the diode housing portion 315A is opened, that is, the surface on the other end side in the axial direction of the rotary electric machine 1.

  Therefore, in FIGS. 11 and 12, a balance plate 316 is disposed on the side of the diode holder 315 where the diode accommodation portion 315A is formed, and the balance plate 316 is connected to the diode D via an insulator (not shown). It is in contact.

  As a result, the balance plate 316 contacts the diode D at the surface via the insulating material, so that the balance plate 316 can function as a holding member that prevents the diode D from jumping out in the axial direction, and the heat of the diode D is dissipated. The balance plate 316 can function as a heat sink for the Therefore, since the balance plate 316 can have the functions as the holding member and the heat sink, the number of parts can be reduced, so that the weight of the rotary electric machine 1 can be reduced.

  Here, holes 316A are formed in the balance plate 316 at positions opposed to the bolts 360 in the axial direction. Therefore, with the balance plate 316 in contact with the diode D, the head 360A of the bolt 360 is inserted into the hole 316A of the balance plate 316. This prevents the head 360A of the bolt 360 from interfering with the balance plate 316 and prevents the interference of the head 360A of the bolt 360 from making the balance plate 316 incapable of contacting the diode D.

  The effect of the rotary electric machine of this embodiment demonstrated as mentioned above is demonstrated. In the rotary electric machine 1 of the present embodiment, the inner rotor 300 is energized with a plurality of induction coils I that generate induction current by interlinking the harmonic components superimposed on the magnetic flux of the armature coil 104. A plurality of field coils F that generate an electromagnetic force, and a plurality of diodes D that rectify the induced current generated by the induction coil I and pass the field coil F as a field current are provided. The induction coil I and the field coil F form a closed circuit with the diode D.

  The diodes D are formed on the outer surface of the diode holder 315 attached to the inner rotor 300 so as to be attachable in a plurality of diode accommodating portions 315A arranged around the rotation axis 1C. Moreover, the diode holder 315 has the groove | channel 315B which connects between adjacent diode accommodating parts 315A by the same plane.

  With this configuration, the heat dissipation of the diode D can be improved, and the strength of the diode holder 315 that holds the diode D can be improved.

  Moreover, in the rotary electric machine 1 of the present embodiment, the diode holder 315 has a connection area 315C for connecting the induction coil I and the field coil F to the diode D on the side where the diode housing portion 315A is formed. In the region 315C, an insertion hole 315D for passing the lead of the induction coil I and the field coil F is provided.

  With this configuration, the rotor winding 330 and the diode D can be reliably connected without grounding.

  Further, in the rotary electric machine 1 of the present embodiment, the inner rotor 300 has the balance plate 316 in contact with the diode D via the insulator on the side of the diode holder 315 where the diode housing portion 315A is formed.

  With this configuration, since the balance plate 316 can have the functions as the holding member and the heat sink, the number of parts can be reduced, so that the rotary electric machine 1 can be reduced in weight.

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

  The rotary electric machine 1 of the present embodiment is an inner rotor type of radial gap structure, but may be an axial gap structure or an outer rotor structure. Moreover, a copper wire, an aluminum conductor, and a litz wire can be used for each coil. Further, as the magnetic path member 201 and the rotor core 301, an SMC (Soft Magnetic Composite) core, which is a soft magnetic composite material, can be used in place of the laminated electromagnetic steel plates. The rotary electric machine 1 can be applied not only to hybrid vehicles but also to other industrial fields such as wind power generators and machine tools.

DESCRIPTION OF SYMBOLS 1 ... rotary electric machine, 1C ... rotation shaft, 100 ... stator, 104 ... armature coil, 300 ... inner rotor (rotor), 315 ... diode holder (cover), 315A .. .. Diode housing portion (holder), 315B: Groove, 315C: Connection area, 315D: Insertion hole, 316: Balance plate (plate), I: Induction coil, F: Field Magnetic coil, C: Rectification circuit (closed circuit), D: Diode (rectification element)

Claims (3)

A stator having an armature coil that generates a magnetic flux by energization;
A rotating electrical machine comprising a rotor which is rotated by the passage of the magnetic flux;
The rotor includes a plurality of induction coils that generate an induction current by linking harmonic components superimposed on the magnetic flux, and a plurality of field coils that generate an electromagnetic force by energizing the induction current. And a plurality of rectifying elements configured to rectify the induction current generated by the induction coil and to supply the field coil with a field current,
The induction coil and the field coil form a closed circuit with the rectifying element,
The rectifying element is formed on a surface of a cover attached to the rotor so as to be attachable in a plurality of holders disposed around a rotation axis.
The rotary electric machine, wherein the cover has a groove communicating between the adjacent holders. The rotary electric machine according to claim 1, wherein the groove communicates with the adjacent holder in the same plane .   The rotary electric machine according to claim 1 or 2, wherein the rotor has a plate on the side of the cover on which the holder is formed, the plate being in contact with the rectifying element via an insulator.

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