JP6358158B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine that transmits power by a magnetic coupling force between rotors.

  Conventionally, there is a rotating electrical machine described in Patent Document 1 that transmits power by a magnetic coupling force between two rotors. The rotating electrical machine described in Patent Document 1 includes a first rotor including a plurality of permanent magnets, a second rotor including a plurality of magnetic pole pieces, and a stator including a plurality of permanent magnets and a three-phase winding. It consists of In this rotating electrical machine, the rotating magnetic field generated by the permanent magnet of the internal rotor interacts with the rotating magnetic field generated by energizing the three-phase winding, and the first rotor and the second rotor are magnetically coupled. . The magnetic coupling can be used to transmit power between the first rotor and the second rotor.

JP 2013-141400 A

  In the rotating electrical machine described in Patent Document 1, a permanent magnet is provided between the winding wound around the stator and the rotor, and magnetic flux is exchanged through the permanent magnet. Become. In addition, eddy current loss also occurs when the magnetic flux passes through the permanent magnet. As a result of these, there is a possibility that the transmission efficiency of power between the first rotor and the second rotor is lowered.

  The present invention has been made to solve the above-described problems, and a main object thereof is to provide a rotating electrical machine capable of improving power transmission efficiency.

  The present invention includes a stator, a first rotor connected to the first rotating shaft, and a second rotor connected to a second rotating shaft that is coaxial with the first rotor, and the first rotation. A rotating electrical machine that magnetically couples a child and a second rotor and transmits power between the first rotating shaft and the second rotating shaft, wherein the first rotor has different polarities in the circumferential direction. The second rotor is formed of a soft magnetic material and arranged in an annular shape, and includes a permanent magnet having a number of pole pairs of m that generates a magnetic force in a direction perpendicular to the arrangement direction. The stator includes k magnetic modulators, and the stator includes n magnetic inductors formed of a soft magnetic material and arranged in an annular shape, and a winding that generates a rotating magnetic field having a pole pair number of m when energized. And the absolute value of the sum or difference between k and n is twice that of m.

  In the above configuration, since the number of pole pairs of the rotating magnetic field generated by the rotation of the first rotor and the rotating magnetic field generated by energizing the three-phase winding is the same, they can be interacted with each other. Magnetic flux generated from the permanent magnet of the first rotor flows into the magnetic inductor through the magnetic modulator of the second rotor, and from the magnetic inductor through the magnetic modulator adjacent to the magnetic modulator, It flows into the permanent magnet of the first rotor. At this time, if the absolute value of the sum or difference between k, which is the number of magnetic modulators, and n, which is the number of magnetic inductors, is twice the number of pole pairs, m, the first rotor and the second rotation The child is magnetically coupled. Thereby, a 1st rotor and a 2nd rotor can be magnetically coupled, without providing a permanent magnet other than a 1st rotor. Therefore, it is possible to suppress an increase in magnetic resistance caused by providing a permanent magnet other than the first rotor and an eddy current loss caused by providing a permanent magnet other than the first rotor. The power transmission efficiency with the second rotor can be improved.

It is sectional drawing perpendicular | vertical to the rotating shaft of the rotary electric machine which concerns on 1st Embodiment. It is II-II sectional drawing of the rotary electric machine which concerns on 1st Embodiment. It is sectional drawing perpendicular | vertical to the rotating shaft of the rotary electric machine which concerns on 2nd Embodiment. It is sectional drawing perpendicular | vertical to the rotating shaft of the rotary electric machine which concerns on 3rd Embodiment. It is sectional drawing perpendicular | vertical to the rotating shaft of the rotary electric machine which concerns on 4th Embodiment. It is sectional drawing perpendicular | vertical to the rotating shaft of the rotary electric machine which concerns on 5th Embodiment. It is II-II sectional drawing of the rotary electric machine which concerns on 6th Embodiment. It is sectional drawing of the rotating shaft direction of the rotary electric machine which concerns on 7th Embodiment.

  Hereinafter, each embodiment will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference numerals in the drawings, and the description of the same reference numerals is used.

<First Embodiment>
The rotating electrical machine according to the present embodiment is mounted on a vehicle equipped with an internal combustion engine, a motor, or the like as a power source, the rotating shaft of the power source is connected to the drive shaft side, and the axle is connected to the driven shaft side. And it is used in order to transmit the motive power from a power source to an axle via a rotary electric machine, and to drive a vehicle.

  FIG. 1 is a cross-sectional view of a rotary electric machine 10 according to the present embodiment perpendicular to the rotation axis, and FIG. The rotating electrical machine 10 includes a stator 11, a first rotor 12, and a second rotor 13. The sections perpendicular to the rotation axis of the stator 11, the first rotor 12, and the second rotor 13 have a uniform shape in the direction of the rotation axis. That is, the stator 11, the first rotor 12, and the second rotor 13 are all in an annular shape. The stator 11, the first rotor 12, and the second rotor 13 are arranged concentrically with the rotation axis of the first rotor 12 and the second rotor 13 as the central axis 14. That is, the rotating electrical machine 10 according to the present embodiment is a radial gap type. In the radial direction, the first rotor 12 is disposed on the most central axis 14 side, and the stator 11 is disposed on the outermost side. The rotating shaft of the first rotor 12 is connected to a drive shaft 15 that is a first rotating shaft, and the rotating shaft of the second rotor 13 is connected to a driven shaft 16 that is a second rotating shaft. The drive shaft 15 and the driven shaft 16 are arranged coaxially.

  The shape of the stator 11 is a cylindrical shape having a predetermined thickness in the radial direction and having a hollow portion inside. On the inner peripheral surface of the stator 11, 24 convex portions 11 a having the same shape are provided at equal intervals in the circumferential direction. The shape of the front end surface of the convex portion 11a on the central axis 14 side is an arc shape forming a part of the inner peripheral surface of the cylinder. By providing these convex portions 11a, concave portions 11b are formed between the convex portions 11a. The number of the concave portions 11b is 24, the same as the number of the convex portions 11a. The shape of the bottom surface of the recess 11b is an arc shape forming a part of the inner peripheral surface of the cylinder. Moreover, since the recessed part 11b is formed between the convex parts 11a, the recessed part 11b shares the convex part 11a and a side surface. That is, the shape of the inner peripheral surface of the stator 11 is a substantially rectangular wave shape in which convex portions 11a and concave portions 11b are alternately provided.

  A magnetic inductor row 17 is provided in contact with the tip of the convex portion 11a. The magnetic inductor row 17 is composed of magnetic inductors 17a having the same shape provided at equal intervals in the circumferential direction. These magnetic inductors 17a are formed of a soft magnetic material. As shown in FIG. 2, the cross-sectional shape of the magnetic inductor 17a is a bilaterally symmetric shape with a straight line passing through the central axis 14 as a target axis, and as shown in FIG. ) Is narrow and has a substantially sector shape with a wide central axis 14 side. In the present embodiment, the number of magnetic inductors 17a is 14.

  Three-phase windings 18u, 18v, and 18w are wound around the recess 11b of the stator 11. In the windings 18u, 18v, and 18w, the windings 18u, 18v, and 18w of the same phase are wound in every other recess 11b with the winding direction reversed for each phase. In the adjacent recess 11b, the winding directions of the windings 18u, 18v, and 18w are reversed. Since the number of the concave portions 11b around which the three-phase windings 18u, 18v, and 18w are wound is 24 as described above, the number of magnetic pole pairs that can be generated by the windings 18u, 18v, and 18w is four.

  The first rotor 12 is made of a soft magnetic material and has a cylindrical shape having a predetermined thickness in the radial direction and having a hollow portion inside. A plurality of permanent magnets 19 are provided on the radial surface of the first rotor 12. The permanent magnets 19 are provided in contact with each other in the circumferential direction. That is, it can be said that the permanent magnet 19 forms an annular cross section. The permanent magnet 19 is magnetized in the radial direction, and the polarities of the permanent magnets 39 adjacent to each other are opposite to each other. This magnetization direction is indicated by an arrow in FIG. In this embodiment, since eight permanent magnets 19 are provided, the number of pole pairs of the magnetic field that can be generated by the permanent magnets 19 is four.

  The 2nd rotor 13 is comprised by the magnetic modulator 13a of the same shape provided in the circumferential direction at equal intervals. These magnetic modulators 13a are formed of a soft magnetic material. The magnetic modulator 13a is connected to the driven shaft 16 at the end on the driven shaft 16 side. The cross-sectional shape of the magnetic modulator 13a is substantially square. In the present embodiment, the number of magnetic modulators 13a is 22.

  The magnetic inductor 17a and / or the magnetic modulator 13a may be accommodated in a cylindrical frame made of a non-magnetic material and having the central axis 14 as the center line in order to increase the mechanical strength in the circumferential direction. Good.

  The inverter 100 converts DC power supplied from a battery or the like mounted on the vehicle into AC power, and supplies the AC power to the windings 18u, 18v, 18w with a phase shifted by 120 °.

  Subsequently, the operation of the rotating electrical machine 10 according to the present embodiment will be described. In the following description, the number of pole pairs of the magnetic field generated by the windings 18u, 18v, and 18w and the number of pole pairs of the permanent magnet 19 are m (= 4), and the number of magnetic modulators 13a is k (= 22). Let n (= 14) be the number of magnetic inductors 17a.

  Since the number of pole pairs of the magnetic field generated by the windings 18u, 18v, 18w and the number of pole pairs of the permanent magnet 19 are equal, the magnetic field generated by the rotation of the first rotor 12 and the rotating magnetic field generated by the windings 18u, 18v, 18w Interact. At this time, the magnetic flux generated by the permanent magnet 19 having the N pole on the outer side and the S pole on the inner side (center axis 14 side) flows to the magnetic inductor 17a via the magnetic modulator 13a. The magnetic flux that has passed through the magnetic inductor 17a passes through the magnetic modulator 13a adjacent in the circumferential direction of the magnetic modulator 13a, and flows to the permanent magnet 19 having the south pole on the outside and the north pole on the inside.

  When the first rotor 12 and the second rotor 13 are rotated, the magnetic flux generated from the permanent magnet 19 is a magnetic flux having a frequency component based on the number of pole pairs of the permanent magnet 19, and the permanent magnet 19 adjacent to the permanent magnet 19. The magnetic flux returning to is also a magnetic flux having a frequency component based on the number of pole pairs of the permanent magnet 19. Therefore, the frequency component of the magnetic flux caught by the magnetic inductor 17a via the magnetic modulator 13a is the absolute value of the sum or difference between the number of the magnetic modulator 13a and twice the number of pole pairs of the permanent magnet 19. There is a need. These frequency components are proportional to the number of pole pairs or the number of magnetic modulators 13a. Therefore, the absolute value of the difference between k and n is twice that of m. In this way, torque is transmitted by the first rotor 12 and the second rotor 13 being magnetically coupled.

  With the above configuration, the rotating electrical machine 10 according to the present embodiment has the following effects.

  -Since no other permanent magnet is provided between the windings 18u, 18v, 18w and the permanent magnet 19, the magnetic resistance between the windings 18u, 18v, 18w and the permanent magnet 19 is reduced. Thereby, the power transmission performance from the drive shaft 15 to the driven shaft 16 can be improved.

  -Since no other permanent magnet is provided between the windings 18u, 18v, 18w and the permanent magnet 19, eddy current loss caused by magnetic flux passing through the permanent magnet can be reduced. Thereby, the power transmission performance from the drive shaft 15 to the driven shaft 16 can be improved.

  Since the second rotor 13 including the magnetic modulator 13a is disposed between the stator 11 including the windings 18u, 18v, and 18w and the first rotor 12 including the permanent magnet 19, the magnetic flux modulation is performed. Works well and can improve power transmission performance.

  In the second rotor 13, adjacent magnetic modulators 13a are spaced apart. As a result, most of the magnetic flux flowing from the permanent magnet 19 to the magnetic modulator 13a flows out to the magnetic inductor 17a, not to the magnetic modulator 13a adjacent to the magnetic modulator 13a. On the other hand, most of the magnetic flux flowing from the magnetic inductor 17a to the magnetic modulator 13a flows out to the permanent magnet 19, not to the magnetic modulator 13a adjacent to the magnetic modulator 13a. That is, magnetic flux leakage between adjacent magnetic modulators 13a can be suppressed, and power transmission performance can be improved.

  In the magnetic inductor row 17, the adjacent magnetic inductors 17a are spaced apart. As a result, most of the magnetic flux flowing from the magnetic modulator 13a to the magnetic inductor 17a flows into the magnetic modulator 13a, not the magnetic inductor 17a adjacent to the magnetic inductor 17a. That is, magnetic flux leakage between adjacent magnetic inductors 17a can be suppressed, and power transmission performance can be improved.

  Since the shape of the magnetic inductor 17a is a substantially fan shape with the convex portion 11a side (outer peripheral side) narrow and the center axis 14 side wide, the magnetic inductor 17a and the magnetic modulator 13a are adjacent to each other while ensuring a facing area. The gap between the magnetic inductors 17a can be widened and the contact area with the stator 11 can be reduced. Thereby, while suppressing the magnetic flux leakage from the magnetic inductor 17a to the adjacent magnetic inductor 17a and the magnetic flux leakage from the magnetic inductor 17a to the stator 11, between the magnetic inductor 17a and the magnetic modulator 13a. The magnetic resistance of the power can be reduced, and as a result, the power transmission performance can be improved.

  -Since the number of the magnetic modulators 13a is larger than the number of the magnetic inductors 17a, the magnetic flux modulation works well, and the power transmission performance can be improved.

  -Since only a permanent magnet should be provided in the 1st rotor 12, the increase in the manufacturing cost resulting from providing many permanent magnets can be suppressed.

Second Embodiment
FIG. 3 is a cross-sectional view of the rotating electrical machine 10 according to the present embodiment perpendicular to the rotation axis. The rotating electrical machine 10 according to the present embodiment differs from the rotating electrical machine 10 according to the first embodiment in the structure of the second rotor 13 and the structure of the magnetic inductor row 17.

  The second rotor 13 is provided with a bridge 13b that connects the magnetic modulators 13a adjacent in the circumferential direction. These bridges 13b are thinner than the magnetic modulator 13a in the radial direction, and connect the outer ends and the inner ends in the radial direction of the magnetic modulators 13a adjacent in the circumferential direction. Note that the bridge 13b that connects the outer ends and the bridge 13b that connects the inner ends have the same radial thickness.

  The magnetic inductor row 17 is provided with a bridge 17b that connects the magnetic inductors 17a adjacent in the circumferential direction. These bridges 17b are thinner than the magnetic inductor 17a in the radial direction, and connect the radially inner ends of the magnetic inductors 17a adjacent in the circumferential direction.

  The bridges 13b and 17b may be formed of the same material as the magnetic modulator 13a and the magnetic inductor 17a, or may be formed of a material different from the magnetic modulator 13a and the magnetic inductor 17a, such as a non-magnetic material. Good.

The bridges 13b and 17b may be changed as follows, for example.
-In the magnetic inductor row | line | column 17, like the 2nd rotor 13, an outer side edge part is also connected by a bridge | bridging.
-In the 2nd rotor 13, like the magnetic inductor row | line | column 17, only an inner side edge part is connected by a bridge | bridging.
-In at least one of the 2nd rotor 13 and the magnetic inductor row | line | column 17, only an outer side edge part is connected by a bridge.
-In at least one of the 2nd rotor 13 and the magnetic inductor row | line | column 17, the part between an outer side edge part and an inner side edge part is connected by a bridge | bridging. In this case, a bridge that connects the outer ends and / or a bridge that connects the inner ends may or may not be provided.
In at least one of the second rotor 13 and the magnetic inductor row 17, when the outer ends and the inner ends are connected by a bridge, the radial thicknesses of the respective bridges are different.
The radial thickness of the bridge of the second rotor 13 is different from the radial thickness of the bridge of the magnetic inductor row 17.

  With the structure according to the present embodiment, the mechanical strength in the circumferential direction of the second rotor 13 and the magnetic inductor row 17 can be increased.

<Third Embodiment>
FIG. 4 is a cross-sectional view of the rotating electrical machine 10 according to the present embodiment perpendicular to the rotation axis. The rotating electrical machine 10 according to the present embodiment differs from the rotating electrical machine 10 according to the first embodiment in the cross-sectional shape of the magnetic modulator 13c of the second rotor 13.

  The width in the circumferential direction of the magnetic modulator 13c is the narrowest at substantially the center in the radial direction, and gradually increases toward both ends in the radial direction. That is, the side surface of the magnetic modulator 13c has a concave shape. Thereby, the area facing the permanent magnet 19 of the first rotor 12 and the area facing the magnetic inductor 17a of the magnetic inductor row 17 are secured while increasing the gap between adjacent magnetic modulators 13c. can do.

  Therefore, in each magnetic modulator 13c, the magnetic resistance of the surface facing the permanent magnet 19 and the magnetic inductor 17a is lowered while suppressing the magnetic flux leakage to the adjacent magnetic modulator 13c, and the torque transmission performance is improved. Can do.

<Fourth embodiment>
FIG. 5 is a cross-sectional view of the rotating electrical machine 10 according to the present embodiment perpendicular to the rotation axis. In the first embodiment, the magnetic inductor 17a is provided so as to contact the convex portion 11a of the stator 11. In this regard, in the present embodiment, a gap is provided between the convex portion 11a of the stator 11 and the magnetic inductor 17c.

  When the convex portion 11a of the stator 11 and the magnetic inductor 17a are provided so as to contact each other, a part of the magnetic flux flowing from the magnetic modulator 13a to the magnetic inductor 17a leaks to the stator 11. Become. In this embodiment, since the space | gap is provided between the convex part 11a of the stator 11 and the magnetic inductor 17c, the magnetic flux leakage from the magnetic inductor 17c to the stator 11 can be suppressed.

<Fifth Embodiment>
The rotary electric machine 10 according to the present embodiment has the same cross section perpendicular to the rotation axis as that of the rotary electric machine 10 according to the first embodiment, and the II-II cross section is different from that of the first embodiment. FIG. 6 is a sectional view taken along line II-II in a direction parallel to the rotation axis.

  The axial thickness of the stator 11 c is smaller than the axial thickness of the first rotor 12, the axial thickness of the second rotor 13, and the axial thickness of the magnetic inductor row 17. Further, the axial thickness of the first rotor 12, the axial thickness of the second rotor 13, and the axial thickness of the magnetic inductor row 17 are equal.

  In the rotating electrical machine 10, it is necessary to secure a space for providing the windings 18u, 18v, and 18w. In the above configuration, the axial thickness of the stator 11 c is smaller than the axial thickness of the first rotor 12, the axial thickness of the second rotor 13, and the axial thickness of the magnetic inductor row 17. The windings 18u, 18v, and 18w can be provided in the generated space. Therefore, the performance can be maintained while reducing the thickness of the rotating electrical machine 10 in the direction of the rotation axis. Further, since the windings 18u, 18v, and 18w are provided in the generated space, the diameters of the windings 18u, 18v, and 18w can be increased. Accordingly, the resistance of the windings 18u, 18v, 18w is reduced, and the power loss in the windings 18u, 18v, 18w can be reduced.

<Sixth Embodiment>
FIG. 7 is a cross-sectional view of the rotary electric machine 20 according to the present embodiment perpendicular to the rotation axis. The rotating electrical machine 20 includes a stator 21, a first rotor 22, and a second rotor 23. The cross sections perpendicular to the rotation axis of the stator 21, the first rotor 22, and the second rotor 23 have a uniform shape in the direction of the rotation axis. The stator 21, the first rotor 22, and the second rotor 23 are arranged concentrically with the rotation axes of the first rotor 22 and the second rotor 23 as the central axis. In the radial direction, the first rotor 22 is disposed on the most central axis side, and the stator 21 is disposed on the outermost side. The rotating shaft of the first rotor 22 is connected to a drive shaft 25 that is a first rotating shaft, and the rotating shaft of the second rotor 23 is connected to a driven shaft 26 that is a second rotating shaft. The drive shaft 25 and the driven shaft 26 are arranged coaxially.

  The shape of the stator 21 is a cylindrical shape having a predetermined thickness in the radial direction and having a hollow portion inside. On the inner peripheral surface of the stator 21, 28 convex portions 21a having the same shape are provided at equal intervals in the circumferential direction. The shape of the front end surface of the convex portion 21a on the central axis side is an arc shape forming a part of the inner peripheral surface of the cylinder. By providing these convex portions 21a, concave portions 21b are formed between the convex portions 21a. The shape of the bottom surface of the recess 21b is an arc shape forming a part of the inner peripheral surface of the cylinder. Moreover, since the recessed part 21b is formed between the convex parts 21a, the recessed part 21b shares the side surface with the convex part 21a. That is, the shape of the inner peripheral surface of the stator 21 is a substantially rectangular wave shape in which convex portions 21a and concave portions 21b are alternately provided.

  Three-phase windings 28u, 28v, 28w are wound around the recess 21b of the stator 21. These windings 28u, 28v, 28w are wound around six continuous recesses 21b, and one recess where no windings 28u, 28v, 28w are wound between the six consecutive recesses 21b. 21b is provided. That is, the four recesses 21b are not wound with the windings 28u, 28v, 28w. In six consecutive recesses 21b, the windings 28u, 28v, 28w are wound around every other recess 21b with the same phase windings 28u, 28v, 28w being reversed in the winding direction. In the adjacent recesses 21b, the winding directions of the windings 28u, 28v, 28w are reversed. Since the three-phase windings 28u, 28v, and 28w are wound around the 24 recesses 21b, the number of magnetic pole pairs that can be generated by the windings 28u, 28v, and 28w is four.

  The first rotor 22 is formed of a soft magnetic material, and has a cylindrical shape having a predetermined thickness in the radial direction and having a hollow portion inside. A plurality of permanent magnets 29 are provided on the radial surface of the first rotor 22. The permanent magnets 29 are provided in contact with each other in the circumferential direction. That is, it can be said that the permanent magnet 29 forms an annular cross section. The permanent magnet 29 is magnetized in the radial direction, and the polarities of the permanent magnets 29 adjacent to each other are opposite to each other. This magnetization direction is indicated by an arrow in FIG. In this embodiment, since eight permanent magnets 29 are provided, the number of magnetic pole pairs that can be generated by the permanent magnets 29 is four.

  The 2nd rotor 23 is comprised by the magnetic modulator 23a of the same shape provided in the circumferential direction at equal intervals. These magnetic modulators 23a are formed of a soft magnetic material. The magnetic modulator 23a is connected to the driven shaft 26 at the end on the driven shaft 26 side. The cross-sectional shape of the magnetic modulator 23a is substantially square. In the present embodiment, the number of magnetic modulators 23a is 36.

  Since the number of pole pairs of the magnetic field generated by the windings 28u, 28v, 28w and the number of pole pairs of the permanent magnet 29 are equal, the rotating magnetic field generated by the rotation of the first rotor 22 and the rotating magnetic field generated by the windings 28u, 28v, 28w. And interact. At this time, the magnetic flux generated by the permanent magnet 29 having the N pole on the outer side and the S pole on the inner side (center axis 14 side) flows to the convex portion 21a of the stator 21 via the magnetic modulator 23a. The magnetic flux that has passed through the convex portion 21a passes through the magnetic modulator 23a adjacent in the circumferential direction of the magnetic modulator 23a, and flows to the permanent magnet 29 having the S pole on the outside and the N pole on the inside. That is, the convex portion 21a of the stator 21 functions as the magnetic inductor 17a in the rotating electrical machine 10 of the first embodiment.

  With the above configuration, the rotating electrical machine 20 according to the present embodiment has the following effects in addition to the effects exhibited by the rotating electrical machine 10 according to the first embodiment.

  -While the rotary electric machine 10 which concerns on 1st Embodiment is provided with the magnetic inductor row | line | column 17, the rotary electric machine 20 which concerns on this embodiment makes the convex part 21a of the stator 21 function as a magnetic inductor. . Therefore, it is not necessary to provide a magnetic inductor. Therefore, simplification and downsizing of the structure of the rotating electrical machine 20 can be realized.

<Seventh embodiment>
FIG. 8 is a cross-sectional view of the rotating electrical machine 30 according to this embodiment in the direction of the rotation axis. The rotating electrical machine 30 includes a stator 31, a first rotor 32, and a second rotor 33. The outer shapes of the stator 31, the first rotor 32, and the second rotor 33 are substantially the same annular shape in a plane perpendicular to the rotation axis. The stator 31 is disposed so as to face one surface of the second rotor 33 in the axial direction, and the first rotor 32 faces the other surface of the second rotor 33 in the axial direction. Is arranged. That is, the second rotor 33 is disposed so as to be sandwiched between the stator 31 and the first rotor 32 in the axial direction. Due to such a configuration, the rotating electrical machine 30 according to the present embodiment is an axial gap type. The rotating shaft of the first rotor 32 is connected to the drive shaft 35, and the rotating shaft of the second rotor 33 is connected to the driven shaft 36.

  On the side of the stator 31 facing the second rotor 33, a magnetic inductor row 37 is provided so as to be in contact therewith. The magnetic inductor row 37 is composed of magnetic inductors 37a having the same shape provided at equal intervals in the circumferential direction. These magnetic inductors 37a are formed of a soft magnetic material. The cross-sectional shape perpendicular to the rotation axis of the magnetic inductor 37a is approximately square or approximately rectangular. In the present embodiment, the number of magnetic inductors 37a is 14.

  Three-phase windings 38u, 38v, and 38w are wound on the opposite side of the stator 31 from the side facing the second rotor 33. The windings 38u, 38v, and 38w are wound so that the number of magnetic poles is four.

  A permanent magnet 39 is provided on the side of the first rotor 32 facing the second rotor 33. The shape of these permanent magnets 39 is an arc shape having a uniform width in the radial direction, and an annular ring is formed by these permanent magnets 39. The polarities of the permanent magnets 39 adjacent in the circumferential direction are opposite to each other. The number of permanent magnets 39 is eight, and the number of magnetic pole pairs formed by these permanent magnets 39 is four.

  The second rotor 33 is provided with magnetic modulators 33a having the same shape in the circumferential direction at equal intervals. In order to arrange these magnetic modulators 33a at equal intervals in the circumferential direction, for example, they are housed in a frame made of a non-magnetic material having recesses at equal intervals on the outer periphery. The cross-sectional shape perpendicular to the rotation axis of the magnetic modulator 33a is approximately square or approximately rectangular. In the present embodiment, the number of magnetic modulators 33a is twelve.

  The operation of the rotating electrical machine 30 according to the present embodiment is similar to the operation of the rotating electrical machine 10 according to the first embodiment.

  With the above configuration, the rotating electrical machine 30 according to the present embodiment has an effect similar to that of the rotating electrical machine 10 according to the first embodiment.

<Modification>
The above embodiments may be used in combination with each other.

  In the fifth embodiment, no windings 28u, 28v, 28w are wound around the four recesses 21b. In this regard, depending on the number of phases of the windings 28u, 28v, 28w, the number of pole pairs of the magnetic field generated by the windings 28u, 28v, 28w, the number of recesses 21b, and the number of magnetic modulators 23a, the windings 28u, 28v, 28w There may be a case where the recess 21b is not formed.

  In the fifth embodiment, a bridge may be provided between the magnetic modulators 23a as in the second embodiment, or the shape of the side surface in the circumferential direction of the magnetic modulator 23a may be a concave shape as in the third embodiment. Good. Moreover, about the stator 21, the 1st rotor 22, and the 2nd rotor 23 in 5th Embodiment, it is good also considering the thickness of an axial direction according to 6th Embodiment.

  -In 7th Embodiment, it is good also considering the shape of the magnetic inductor 37a as the magnetic inductor 17a of 1st Embodiment. At this time, the magnetic inductor 37a secures a facing area with the magnetic modulator 33a facing in the axial direction, widens the gap with the adjacent magnetic inductor 37a, and increases the contact area with the stator 31. In order to reduce the size, a substantially conical shape or the like may be used.

  In the seventh embodiment, the shape of the magnetic modulator 33a may be the same as that of the magnetic modulator 13c of the third embodiment. Further, as in the second embodiment, a bridge may be provided between at least one of the magnetic modulators 33a and between the magnetic inductors 37a.

  -In 7th Embodiment, you may provide a gap between the stator 31 and the magnetic inductor row | line | column 37 like 4th Embodiment.

  -In 7th Embodiment, it is good also as what does not provide the magnetic inductor row | line | column 37 like 5th Embodiment. At this time, the stator 31 may have a concavo-convex structure as in the fifth embodiment, and the convex portion may function as the magnetic inductor 37a.

  In each embodiment, the number of pole pairs of the permanent magnet, the number of pole pairs of the magnetic field generated by the winding, the number of magnetic inductors, and the number of magnetic modulators are specified. Not limited. In other words, the absolute value of the sum or difference of k, which is the number of magnetic modulators, and n, which is the number of magnetic inductors, may be twice the number m of pole pairs. These k, m, and n are natural numbers. Further, if k is a number larger than n, the magnetic flux modulation works better, and the power transmission performance can be improved.

  In the above embodiment, the rotating electrical machines 10, 20, 30 are mounted on the vehicle, and the power source of the vehicle and the axle are connected via the rotating electrical machines 10, 20, 30. The usage of 30 is not limited to this. For example, you may use for the connection with the starter motor for starting the internal combustion engine mounted in the vehicle, and the internal combustion engine. Further, the mounting target is not limited to the vehicle.

  DESCRIPTION OF SYMBOLS 10 ... Rotary electric machine, 11 ... Stator, 11a ... Convex part, 11b ... Concave part, 11c ... Stator, 12 ... 1st rotor, 13 ... 2nd rotor, 13a ... Magnetic modulator, 13b ... Bridge, 13c ... Magnetic modulator, 15 ... drive shaft, 16 ... driven shaft, 17a ... magnetic inductor, 17b ... bridge, 17c ... magnetic inductor, 18u ... winding, 18v ... winding, 18w ... winding, 19 ... permanent magnet, DESCRIPTION OF SYMBOLS 20 ... Rotary electric machine, 21 ... Stator, 21a ... Convex part, 21b ... Concave part, 22 ... 1st rotor, 23 ... 2nd rotor, 23a ... Magnetic modulator, 25 ... Drive shaft, 26 ... Driven shaft, 27 ... permanent magnet, 28u ... winding, 28v ... winding, 28w ... winding, 29 ... permanent magnet, 30 ... rotating electrical machine, 31 ... stator, 32 ... first rotor, 33 ... second rotor, 33a ... Magnetic modulator, 35 ... drive shaft, 36 ... driven shaft, 37a ... magnetic inductor, 38 ... winding, 38v ... winding, 38w ... winding, 39 ... permanent magnet.

Claims (15)

A stator (11, 21, 31);
A first rotor (12, 22, 32) connected to the first rotating shaft (15, 25, 35);
A second rotor (13, 23, 33) connected to a second rotation shaft (16, 26, 36) that is coaxial with the first rotation shaft, and the first rotor and the second rotation A rotating electrical machine (10, 20, 30) that magnetically couples a child and transmits power between the first rotating shaft and the second rotating shaft;
The first rotors are arranged so as to have different polarities alternately in the circumferential direction, and generate a magnetic force in a direction orthogonal to the arrangement direction, and permanent magnets (19, 29, 39) having m pole pairs With
The second rotor includes k magnetic modulators (13a, 23a, 33a) formed of a soft magnetic material and arranged in an annular shape,
The stator includes n magnetic inductors (17a, 17c, 21a, 37a) formed of a soft magnetic material and arranged in an annular shape, and windings that generate a rotating magnetic field having a pole pair number of m when energized ( 18u, 18v, 18w, 28u, 28v, 28w, 38u, 38v, 38w)
The rotating electrical machine, wherein an absolute value of a sum or a difference between k and n is twice the m. The stator has a cylindrical hollow portion, and a plurality of concave portions (11b, 21b) are formed so as to surround the hollow portion,
The rotating electrical machine according to claim 1, wherein the winding is wound around the concave portion of the stator.   The rotating electrical machine according to claim 2, wherein the number of convex portions (11a, 21a) formed between the concave portions and the number of the magnetic inductors are the same.   The rotating electrical machine (20) according to claim 3, wherein the magnetic inductor (21a) is the projection (21a) of the stator (21).   4. The rotating electrical machine according to claim 1, wherein at least one of the magnetic modulator and the magnetic inductor is arranged such that adjacent ones are spaced apart from each other. 5.   The magnetic inductors adjacent to each other in the circumferential direction are connected by a bridge (17b) having a smaller radial thickness than the magnetic inductor. The rotating electrical machine according to any one of the above. The stator includes a stator body and the magnetic inductors (17a, 17c, 37a) attached to the stator body,
The area of the surface of the magnetic inductor facing the stator body is smaller than the area of the surface facing the first rotor or the second rotor. 6. The rotating electrical machine according to claim 1. The stator includes a stator body and the magnetic inductor (17c) attached to the stator body,
The rotating electrical machine according to claim 1, wherein the magnetic inductor is attached to the stator body with a predetermined gap therebetween.   9. The magnetic modulator according to claim 1, wherein the magnetic modulators adjacent to each other in the circumferential direction are connected by a bridge (13 b) having a smaller radial thickness than the magnetic modulator. The rotating electrical machine according to claim 1.   The rotating electrical machine according to any one of claims 1 to 9, wherein the magnetic modulator (13c) has a concave shape on the side surfaces facing each other in the circumferential direction.   11. The rotating electrical machine according to claim 1, wherein the k is larger than the n.   The direction of orthogonal to a rotating shaft or a rotating shaft direction WHEREIN: A said 2nd rotor is arrange | positioned between the said 1st rotor and the said stator, The any one of Claims 1-11 characterized by the above-mentioned. The rotating electrical machine according to the item. The stator, the first rotor, and the second rotor are arranged to face each other in a radial direction,
The rotating electric machine according to any one of claims 1 to 12, wherein the stator is disposed on an outermost side in a radial direction.   14. The rotating electrical machine according to claim 13, wherein a thickness of the stator in a rotation axis direction is thinner than a thickness of the permanent magnet, the magnetic modulator, and the magnetic inductor in a rotation axis direction.   The said stator (31), a said 1st rotor (32), and a said 2nd rotor (33) are arrange | positioned facing a rotating shaft direction, The any one of Claims 1-12 characterized by the above-mentioned. The rotating electrical machine (30) according to claim 1.

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