JP2013059177A - Magnetic gear and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic gear in which heat generated in a first rotor and a second rotor can be cooled effectively by outside air, by forming a ventilation path penetrating in the radial direction between stator magnetic pole pieces adjoining in the circumferential direction, and to provide a manufacturing method therefor.SOLUTION: The magnetic gear comprises a first rotor 4 bonded to a first rotating shaft 2 and having a multipolar magnetomotive force, a second rotor 7 bonded to a second rotating shaft 3 coaxial with the first rotating shaft 2, and disposed side by side with the first rotor 4 in the axial direction while having a multipolar magnetomotive force, and a stator 12 disposed to surround the first rotor 4 and the second rotor 7 disposed side by side in the axial direction. The stator 12 consists of a pair of piece support plates 13 disposed on both sides in axial direction of the first rotor 4 and the second rotor 7 that are disposed side by side in the axial direction, and a plurality of stator pole pieces 22 stretched, respectively, between the pair of piece support plates 13 and disposed, at predetermined pitch, in the circumferential direction while ensuring a predetermined clearance, with both end sides being fixed to the pair of piece support plates 13.

Description

  The present invention relates to a magnetic gear used for increasing the rotational torque received by a blade such as wind power and transmitting it to a generator and a method for manufacturing the same.

  In recent years, many magnetic gears have been proposed in which a stator that modulates magnetomotive force is provided between a high-speed rotor and a low-speed rotor, and rotational torque from the outside can be transmitted in a non-contact manner to change the rotational speed. ing.

  For example, Non-Patent Document 1 discloses a high-speed rotor and a low-speed rotation that have permanent magnet pairs with different numbers of pole pairs and are fixed to each of a pair of coaxially arranged rotating shafts and arranged side by side in the axial direction. And a stator in which the ferromagnetic pole pieces are uniformly arranged in the circumferential direction and inserted into the non-magnetic shell and disposed so as to surround the high-speed rotor and the low-speed rotor through an air gap. A so-called tandem type conventional magnetic gear has been proposed.

Li Yong, Xing Jingwei, Peng Kerong and Lu Yongping; "Principle and Simulation Analysis of a Novel Structure Magnetic Gear", Electrical Machine and Systems, 2008. ICEMS 2008. International Conference on Publication (2008), p. 3845-3849

  A conventional stator of a magnetic gear is made of a nonmagnetic material and has a cylindrical magnetic pole piece support member in which slots opened on the inner peripheral side are arranged at an equiangular pitch, and magnetic poles housed and held in each slot It consists of a piece. Therefore, there has been a problem that the outer peripheral sides of the high-speed rotor and the low-speed rotor are covered with the magnetic pole piece support member and the shell, and heat generated by the high-speed rotor and the low-speed rotor cannot be effectively cooled by outside air.

  Further, the conventional magnetic gear is assembled by magnetizing magnet members fixed to the outer peripheral surfaces of the high-speed rotor and the yoke of the low-speed rotor, and then inserting the high-speed rotor and the low-speed rotor into the stator. Therefore, when the high-speed rotor and the low-speed rotor are inserted into the stator, a magnetic attractive force is generated between the permanent magnet and the pole piece, so that the permanent magnet comes into contact with the pole piece, There was a problem that chipping occurred, yield decreased, and assembly workability decreased. In order to mitigate the influence of the above-described magnetic attractive force, it is conceivable to widen the air gap. However, a new problem arises that torque is reduced and characteristics are deteriorated.

A first object of the present invention is to form a ventilation passage penetrating in the radial direction between stator pole pieces adjacent in the circumferential direction, and effectively cool the heat generated in the first rotor and the second rotor by outside air. It is to get a magnetic gear that can.
A second object of the present invention is to provide a pair of magnetic pole piece support plates on both axial sides of the first and second rotors arranged side by side in the axial direction, and to remove the stator magnetic pole pieces. Permanent magnets caused by magnetic attraction by passing between the pair of pole piece support plates so as to have a predetermined air gap from the diameter side and fixing both ends of the stator pole pieces to the pair of pole piece support plates It is possible to obtain a method for manufacturing a magnetic gear that can suppress a decrease in yield due to the occurrence of cracks and chips, and can suppress a decrease in assembly workability.

  A magnetic gear according to the present invention is fixed to a first rotating shaft and has a multipolar magnetomotive force, and is fixed to a second rotating shaft coaxial with the first rotating shaft and fixed to the first rotating shaft. And a second rotor having a multi-pole magnetomotive force, and the first rotor and the second rotor arranged side by side in the axial direction. And a stator to be provided. The stator includes a pair of magnetic pole piece support plates disposed on both axial sides of the first rotor and the second rotor disposed side by side in the axial direction, and the pair of magnetic pole piece supports, respectively. A plurality of stator pole pieces that are passed between the plates, secured in the circumferential direction with a predetermined gap and arranged at a predetermined pitch in the circumferential direction, and fixed at both ends to the pair of pole piece support plates Has been.

  According to this invention, the plurality of stator pole pieces are passed between the pair of pole piece support plates, are arranged at a predetermined pitch in the circumferential direction with a predetermined gap in the circumferential direction, and a pair of both ends are paired. It is fixed to the pole piece support plate. Therefore, the outside air is supplied to the first and second rotors arranged side by side in the axial direction from the gap between the stator pole pieces, and the heat generation in the first and second rotors is effectively performed. Can be cooled.

It is sectional drawing which shows typically the structure of the magnetic gear which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows the magnetic gear which concerns on Embodiment 1 of this invention. It is a perspective view explaining the support structure of the stator pole piece in the magnetic gear which concerns on Embodiment 1 of this invention. It is a figure explaining the attachment method of the stator pole piece in the magnetic gear which concerns on Embodiment 1 of this invention. It is sectional drawing which shows typically the structure of the magnetic gear which concerns on Embodiment 2 of this invention. It is a disassembled perspective view which shows the magnetic gear which concerns on Embodiment 2 of this invention. It is a perspective view explaining the support structure of the stator pole piece in the magnetic gear which concerns on Embodiment 2 of this invention. It is a disassembled perspective view which shows the magnetic gear which concerns on Embodiment 3 of this invention. It is a perspective view which shows the 1st rotor applied to the magnetic gear which concerns on Embodiment 3 of this invention.

  Hereinafter, preferred embodiments of the magnetic gear of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a sectional view schematically showing the configuration of a magnetic gear according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view showing the magnetic gear according to Embodiment 1 of the present invention, and FIG. FIG. 4 is a perspective view for explaining a stator pole piece support structure in the magnetic gear according to the first embodiment, and FIG. 4 is a diagram for explaining a method for attaching the stator pole piece in the magnetic gear according to the first embodiment of the present invention. .

  1 to 3, the magnetic gear 1 is fixed to a first rotor 4 fixed to the first rotating shaft 2 and a second rotating shaft 3 coaxial with the first rotating shaft 2. The second rotor 7 arranged in the axial direction and the first rotor 4 and the second rotor 7 arranged in the axial direction so as to have a predetermined air gap on the outer peripheral side. A tandem magnetic gear including the stator 12.

  The first rotating shaft 2 includes a cylindrical first boss portion 2a, a cylindrical bearing housing portion 2b integrally formed coaxially with one end of the first boss portion 2a, and coaxial with the other end of the first boss portion 2a. And a columnar first shaft portion 2c integrally formed therewith. The 2nd rotating shaft 3 is provided with the cylindrical 2nd boss | hub part 3a and the cylindrical 2nd axial part 3b integrally formed by coaxial at the other end of the 2nd boss | hub part 3a.

  The first rotor 4 has an annular first yoke portion 5 having a first shaft insertion hole 5a formed at the axial center position, and is fixed to the outer peripheral surface of the first yoke portion 5 and arranged at an equiangular pitch. The first permanent magnet 6 is provided. The first permanent magnets 6 arranged in the circumferential direction are magnetized and oriented so that the polarities of the outer peripheral surfaces thereof are alternately N and S poles. Here, four pole pairs of first permanent magnets 6 are arranged on the outer peripheral surface of the first yoke portion 5 at an equiangular pitch in the circumferential direction. The first rotor 4 is fixed to the first boss portion 2a press-fitted into the first shaft insertion hole 5a and operates as a high-speed rotor.

  The second rotor 7 is fixed to an annular second yoke portion 8 in which a second shaft insertion hole 8a is formed at the axial center position, and is fixed to the outer peripheral surface of the second yoke portion 8 and arranged at an equiangular pitch. And a second permanent magnet 9. The second permanent magnets 9 arranged in the circumferential direction are magnetized and oriented so that the polarities of the outer peripheral surfaces thereof are alternately N and S poles. Here, 45 pole pairs of permanent magnets 9 are arranged on the outer peripheral surface of the second yoke portion 8 at an equiangular pitch in the circumferential direction. The second rotor 7 is fixed to the second boss portion 3a press-fitted into the second shaft insertion hole 8a and operates as a low-speed rotor.

  The stator 12 is made of, for example, a disk using a nonmagnetic material such as aluminum or stainless steel, and a pair of magnetic pole piece support plates 13 disposed coaxially with a predetermined distance in the axial direction, for example, Each is produced in a rectangular parallelepiped by laminating magnetic thin plates such as electromagnetic steel plates, and is passed between a pair of pole piece support plates 13 with the length direction aligned in the axial direction, and both ends thereof are held by the pair of pole piece support plates 13. And 49 stator pole pieces 22 arranged at an equiangular pitch on concentric circles.

  On the outer peripheral surface of the pole piece support plate 13, magnetic pole piece storage grooves 14 having a groove shape with a rectangular cross section substantially equal to the cross section shape of the stator pole piece 22 are opened to the outer diameter side, and are circumferentially arranged at an equiangular pitch. 49 are formed in the direction. Two screw holes 15 are formed on both sides in the circumferential direction of each magnetic pole piece storage groove 14 of the magnetic pole piece support plate 13 so as to be spaced apart from each other in the radial direction. The pole piece mounting plate 16 is formed in a rectangular frame shape having a pole piece insertion hole 17 whose hole shape is a rectangle substantially equal to the cross-sectional shape of the stator pole piece 22, and the elongated hole 18 corresponds to the pole piece insertion hole 17. Two holes are formed on both sides in the short side direction, spaced apart in the long side direction, with the long axis direction of the hole being the long side direction. Further, the second bearing 20 is press-fitted and held in a bearing holding hole 19 formed at the axial center position of the pole piece support plate 13. The diameter of the inscribed circle on the bottom surface of the pole piece housing groove 14 is slightly larger than the outer diameter of the first and second rotors 4 and 7.

  Then, the first rotor 4 press-fits the first shaft portion 2c of the first rotating shaft 2 into the second bearing 20 held in the bearing holding hole 19 of one pole piece support plate 13, and The pole piece support plate 13 is rotatably supported. Similarly, the second rotor 7 press-fits the second shaft portion 3b of the second rotating shaft 3 into the second bearing 20 held in the bearing holding hole 19 of the other pole piece support plate 13, and the other The magnetic pole piece support plate 13 is rotatably supported. The pair of magnetic pole piece support plates 13 are arranged coaxially and spaced apart from each other in the axial direction, and the first rotor 4 and the second rotor 7 are arranged coaxially and aligned in the axial direction to rotate with each other. It is possible to arrange. Further, one end side of the second boss portion 3a is rotatably connected to the bearing housing portion 2b via the first bearing 10, and an assembly of the first rotor 4 and the second rotor 7 arranged in parallel in the axial direction. Increases rigidity.

  The stator pole piece 22 is inserted between the pair of pole piece support plates 13 by inserting both end sides thereof into the pole piece receiving groove 14. The magnetic pole piece mounting plate 16 is attached to both ends of the stator magnetic pole piece 22 that extends from the magnetic pole piece support plate 13 by inserting the stator magnetic pole piece 22 into the magnetic pole piece insertion hole 17. Further, a mounting bolt 23 as a fastening member is inserted into the elongated hole 18 and fastened to the screw hole 15, and both ends of the stator magnetic pole piece 22 are fixed to the pair of magnetic pole piece support plates 13. At this time, before fastening the mounting bolt 23, the magnetic pole piece mounting plate 13 is moved in the long axis direction of the elongated hole 18, and between the stator magnetic pole piece 22 and the first rotor 4 and the second rotor 7. The air gap is adjusted.

  Next, in order to assemble the magnetic gear 1 configured as described above, first, the first permanent magnet 6 when not attached is disposed and fixed to the outer peripheral surface of the first yoke portion 5 at an equiangular pitch. After the 1 boss portion 2a is press-fitted into a first shaft insertion hole 5a formed at the axial center position of the first yoke portion 5, the first permanent magnet 6 is magnetized to produce the first rotor 4. Similarly, the second permanent magnet 9 when not attached is disposed and fixed to the outer peripheral surface of the second yoke portion 8 at an equiangular pitch, and the second boss portion 3 a is formed at the axial center position of the second yoke portion 8. After press-fitting into the second shaft insertion hole 8a, the second permanent magnet 9 is magnetized to produce the second rotor 7.

  Next, the second bearing 20 is press-fitted into the bearing holding hole 19 formed at the axial center position of one magnetic pole piece support plate 13, and the first shaft portion 2 c is press-fitted into the second bearing 20, thereby the first rotor. 4 is assembled to the pole piece support plate 13. Similarly, the second bearing 20 is press-fitted into the bearing holding hole 19 formed at the axial center position of the other pole piece support plate 13, and the second shaft portion 3 b is press-fitted into the second bearing 20. The rotor 7 is assembled to the pole piece support plate 13.

  Next, the first bearing 10 is press-fitted into the bearing housing portion 2b of the first rotary shaft 2, the second boss portion 3a of the second rotary shaft 3 is press-fitted into the first bearing 10, and the first rotary shaft 2 and the first The two rotating shafts 3 are connected to each other so as to be rotatable. Thereby, the 1st rotor 4 and the 2nd rotor 7 can rotate to a pair of magnetic pole piece support plates 13 via the 1st rotating shaft 2 and the 2nd rotating shaft 3 along with the axial direction along with the same axis. Supported by

  Next, the pair of magnetic pole piece support plates 13 is positioned so that the magnetic pole piece housing groove 14 faces the axial direction. Then, as shown in FIG. 4, the pole piece mounting plates 16 are attached to both ends of the stator pole piece 22, and the stator pole piece 22 is attached from the outer diameter side of the first rotor 4 and the second rotor 7. It accommodates in each pair of the opposing magnetic pole piece accommodation groove | channels 14. FIG. Next, the mounting bolt 23 is inserted into the elongated hole 18 and fastened to the screw hole 15, and both ends of the stator magnetic pole piece 22 are fixed to the pair of magnetic pole piece support plates 13 to assemble the magnetic gear 1. At this time, prior to fastening of the mounting bolt 23, the magnetic pole piece mounting plate 13 is moved in the long axis direction of the elongated hole 18, and the radial position of the stator magnetic pole piece 22, that is, the stator magnetic pole piece 22 and the first rotation. Adjustment of the air gap between the child 4 and the second rotor 7 is performed.

  In the magnetic gear 1 configured as described above, for example, rotational torque received by a blade (not shown) such as wind power is transmitted to the second shaft portion 3b, and the second rotor 7 is rotationally driven. Then, the multipole magnetomotive force generated by the second permanent magnet 9 of the second rotor 7 is generated by the stator pole pieces 22 arranged in the circumferential direction through the air gap on the outer peripheral side of the second rotor 7. The polar component of the single rotor 4 is converted into the same magnetomotive force. Thereby, the 1st rotor 4 arrange | positioned through the air gap at the inner peripheral side of the stator pole piece 22 is rotationally driven.

Here, in this type of magnetic gears, the number of pole pairs of the first rotor 4 N _H, when the pole pairs of the second rotor 7 was N _L, the number N _S of the stator pole pieces 22 has the formula ( If 1) is satisfied, the speed of the first rotor 4 is N _L / N _H times the speed of the second rotor 7.
N _S = N _L ± N _H (1)
In the formula (1), + is a case where the rotation directions of the first rotor 4 and the second rotor 7 are opposite directions, and-is a case where the rotation directions of the first rotor 4 and the second rotor 7 are the same. This is the case of direction.

  In this magnetic gear 1, the first rotor 4 is a 4-pole pair, the second rotor 7 is a 45-pole pair, and the number of stator pole pieces 22 is 49 (= 45 + 4). 1) is satisfied, the first rotor 4 is increased by 11.25 (= 45/4) times, and is driven to rotate in the direction opposite to that of the second rotor 7.

  According to the first embodiment, the stator pole pieces 22 are supported by a pair of pole pieces arranged on both sides in the axial direction of the first rotor 4 and the second rotor 7 that are coaxially arranged in the axial direction. Since it is constructed between the plates 13 and arranged on the outer peripheral side of the first rotor 4 and the second rotor 7 at a predetermined pitch in the circumferential direction, there is a gap between the stator pole pieces 22 adjacent in the circumferential direction. Secured. Therefore, since the outside air can be supplied to the first rotor 4 and the second rotor 7 through the gap between the stator pole pieces 22, the first rotor 4 and the second rotor 7 can be effectively cooled by the outside air. . Accordingly, an excessive temperature rise of the first rotor 4 and the second rotor 7 that induces demagnetization of the first permanent magnet 6 and the second permanent magnet 9 can be suppressed, so that the first permanent magnet 6 and the second permanent magnet 6 The characteristic deterioration due to the demagnetization of the magnet 9 is suppressed, and the torque can be improved.

  A pair of magnetic pole piece support plates 13 are disposed on both axial sides of the first rotor 4 and the second rotor 7 that are coaxially arranged in the axial direction, and the stator magnetic pole piece 22 is connected to the first rotor 4. And it is constructed between a pair of magnetic pole piece support plates 13 from the outer diameter side of the second rotor 7. Therefore, the stator pole piece 22 is attracted to the first permanent magnet 6 and the second permanent magnet 9 side by the magnetic attraction force of the first permanent magnet 6 and the second permanent magnet 9, and a pair of pole piece support plates at both ends thereof. 13 is prevented from further approaching the first permanent magnet 6 and the second permanent magnet 9 side. Therefore, when the magnetic gear 1 is assembled, the occurrence of damage to the first permanent magnet 6 and the second permanent magnet 9 due to the stator pole piece 22 hitting the first permanent magnet 6 and the second permanent magnet 9 can be eliminated. And the yield can be increased. Further, since the complicated process of inserting the first rotor 4 and the second rotor 7 into the stator 12 while being affected by the magnetic attractive force is eliminated, the assembly workability of the magnetic gear 1 is greatly improved. Can do.

  A magnetic pole piece housing groove 14 whose bottom surface is located on the outer diameter side of the outer peripheral surfaces of the first rotor 4 and the second rotor 7 is formed on the outer periphery of the magnetic pole piece support plate 13, and the end side of the stator magnetic pole piece 22 is disposed on the end side. Since the stator pole piece 22 is installed, the end side of the stator pole piece 22 is housed in the pole piece housing groove 14 so that the stator pole piece 22 and the first and second permanent magnets 4 and 4 are housed. 7 is reliably avoided and the yield can be further increased.

  An elongated hole 18 having the long axis direction of the hole as the long side direction is formed in the magnetic pole plate mounting plate 16 so that the radial position of the magnetic pole plate mounting plate 16 with respect to the magnetic pole piece support plate 13 can be adjusted. The air gap between the magnetic pole piece 22 and the first rotor 4 and the second rotor 7 can be adjusted with high accuracy. Therefore, since the uniformity of the air gap in the circumferential direction can be ensured, the magnetic attractive force generated between the stator pole piece 22 and the first rotor 4 and the second rotor 7 becomes uniform in the circumferential direction. Thereby, an eccentric load does not act on the 1st rotor 4 and the 2nd rotor 7, and the mechanical reliability of the magnetic gear 1 is improved. Further, it is not necessary to increase the processing accuracy of the pole piece housing groove 14, and the cost of the pole piece support plate 13 can be reduced. Furthermore, it is not necessary to excessively widen the air gap, and torque reduction can be suppressed.

  In the first embodiment, the magnetic pole piece mounting plate is moved in the long axis direction of the elongated hole to adjust the air gap between the stator magnetic pole piece and the first and second rotors. However, if the diameter of the inscribed circle on the bottom surface of the pole piece housing groove is machined with high accuracy, the adjustment work of the air gap can be omitted.

  Further, in the first embodiment, the first permanent magnet and the second permanent magnet that are not attached are disposed and fixed to the outer peripheral surfaces of the first yoke portion and the second yoke portion at an equiangular pitch to perform the first rotation. After assembling the shaft and the second rotating shaft to the first yoke portion and the second yoke portion, the first permanent magnet and the second permanent magnet are magnetized to produce the first rotor and the second rotor. However, the method of magnetizing the first permanent magnet and the second permanent magnet is not limited to this. For example, the first rotor and the second rotor are paired via the first rotating shaft and the second rotating shaft. After the magnetic pole piece support plate is rotatably assembled, the first permanent magnet and the second permanent magnet may be magnetized.

Embodiment 2. FIG.
5 is a cross-sectional view schematically showing the configuration of the magnetic gear according to Embodiment 2 of the present invention, FIG. 6 is an exploded perspective view showing the magnetic gear according to Embodiment 2 of the present invention, and FIG. 6 is a perspective view for explaining a support structure of a stator pole piece in a magnetic gear according to Embodiment 2. FIG.

5 to 7, the magnetic pole piece support plate 13A is mounted on a base 24 extending in the axial direction from the radial inner side of each magnetic pole piece storage groove 14, and rotatably mounted on the base 24 with the axial direction as the radial direction. An air gap adjusting bolt 25. The pole piece mounting plate 16 </ b> A supports a support arm 26 extending from one short side of the rectangular frame shape in a direction perpendicular to the cross section of the pole piece insertion hole 17, and the hole direction as the long axis direction of the elongated hole 18. A screw hole 27 formed in the arm 26. A magnetic pole piece mounting plate 16A is attached to the end of the stator magnetic pole piece 22 extending from the magnetic pole piece support plate 13A in the magnetic pole piece insertion hole 17, and an air gap adjustment bolt 25 is formed on the support arm 26. Screwed into the screw hole 27. Further, the mounting bolt 23 is inserted into the elongated hole 18 and fastened to the screw hole 15, and both ends of the stator pole piece 22 are fixed to the pair of pole piece support plates 13A. Here, the gantry 24, the air gap adjusting bolt 25, the support arm 26, and the screw hole 27 constitute an air gap adjusting means.
Other configurations are the same as those in the first embodiment.

  In the magnetic gear 1A configured as described above, the air gap adjusting bolt 25 rotatably attached to the gantry 24 has a magnetic pole piece attached to the end of the stator magnetic pole piece 22 extending from the magnetic pole piece support plate 13A. It is screwed into a screw hole 27 formed in the support arm 26 of the mounting plate 16A. Therefore, the magnetic pole piece support plate 13A can be moved in the radial direction by turning the air gap adjusting bolt 25 prior to fastening of the mounting bolt 23. Thereby, since the air gap between the stator pole piece 22 and the first rotor 4 and the second rotor 7 can be adjusted with high accuracy, the uniformity of the air gap in the circumferential direction can be further improved. Furthermore, the air gap can be made smaller and the torque can be increased.

Embodiment 3 FIG.
8 is an exploded perspective view showing a magnetic gear according to Embodiment 3 of the present invention, and FIG. 9 is a perspective view of a first rotor applied to the magnetic gear according to Embodiment 3 of the present invention.

8 and 9, the first rotor 30 is produced by laminating magnetic thin plates such as electromagnetic steel plates, for example, and eight salient poles 32 extending in the radial direction are arranged at an equiangular pitch in the circumferential direction. A first yoke portion 31 in which a shaft insertion hole 33 is formed at an axial center position, and a field winding 34 including a concentrated winding coil 35 that is produced by winding a conductor wire around a salient pole 32. ing. That is, the first rotor 30 is a field salient pole type rotor that is fielded by the field winding 34.
In the third embodiment, the first rotor 30 fielded by the field winding 34 is used in place of the first rotor 4 fielded by the first permanent magnet 6, except for the above. The configuration is the same as in the first embodiment.

  In the magnetic gear 1 </ b> B configured in this way, a field current of four pole pairs in which N poles and S poles are alternately arranged in the circumferential direction by passing a field current in the opposite direction to the adjacent concentrated winding coil 35. Since the magnetic pole is formed, the first rotor 30 operates in the same manner as the first rotor 4 described above. The magnetic gear 1B is assembled in the same manner as the magnetic gear 1 according to the first embodiment.

Also in this magnetic gear 1B, since a gap is secured between the stator pole pieces 22 adjacent in the circumferential direction, the outside air is passed through the gap between the stator pole pieces 22 in the first rotor 30 and the second rotor. 7 and the first rotor 30 and the second rotor 7 can be effectively cooled by the outside air. Thereby, since the excessive temperature rise of the 1st rotor 30 is suppressed, the field current energized to the field winding 34 can be increased, and the torque can be improved. Moreover, since the excessive temperature rise of the 2nd rotor 7 is suppressed, the characteristic deterioration by the demagnetization of the 2nd permanent magnet 9 is suppressed, and a torque can be improved.
Therefore, the third embodiment also has the same effect as the first embodiment.

In the third embodiment, the first rotor corresponding to the high-speed rotor is constituted by the field salient pole type rotor that is fielded by the field winding, but the first rotor corresponding to the low-speed rotor is used. The two rotors may be composed of field salient pole type rotors which are fielded by field windings, and the first and second rotors corresponding to the high speed and low speed rotors are fielded by the field windings. You may comprise with a field salient pole type | mold rotor.
In each of the above embodiments, the pole piece support plate is made of a nonmagnetic material, but the material of the pole piece support plate is not limited to a nonmagnetic material, and may be a magnetic material.
In each of the above embodiments, the first rotating shaft is used as the output shaft and the second rotating shaft is used as the input shaft. However, the first rotating shaft may be used as the input shaft and the second rotating shaft may be used as the output shaft. Good.

  1, 1A, 1B Magnetic gear, 2 First rotating shaft, 3 Second rotating shaft, 4 First rotor, 6 First permanent magnet, 7 Second rotor, 9 Second permanent magnet, 12 Stator, 13, 13A magnetic pole piece support plate, 14 magnetic pole piece storage groove, 16, 16A magnetic pole piece mounting plate, 18 slotted hole, 22 stator magnetic pole piece, 23 mounting bolt (fastening member), 24 mount (air gap adjusting means), 25 air Gap adjustment bolt (air gap adjustment means), 26 support arm (air gap adjustment means), 27 screw hole (air gap adjustment means), 30 first rotor, 34 field winding.

Claims (6)

A first rotor fixed to the first rotating shaft and having a multipole magnetomotive force;
A second rotor fixed to a second rotating shaft coaxial with the first rotating shaft and arranged in line with the first rotor in the axial direction and having a multipole magnetomotive force;
A stator disposed so as to surround the first rotor and the second rotor disposed side by side in the axial direction;
The stator is
A pair of magnetic pole piece support plates disposed on both axial sides of the first rotor and the second rotor disposed side by side in the axial direction;
Each of them is passed between the pair of magnetic pole piece support plates, arranged in a circumferential direction at a predetermined pitch with a predetermined gap in the circumferential direction, and a plurality of ends fixed to the pair of magnetic pole piece support plates. A magnetic gear comprising: a stator pole piece. Each of the pair of magnetic pole piece support plates has an opening on the outer peripheral side and a bottom surface positioned radially outward from the outer peripheral surfaces of the first rotor and the second rotor so as to face each other in the axial direction. Magnetic pole piece storage grooves formed at the predetermined pitch in the circumferential direction respectively,
A magnetic pole piece mounting plate mounted on both ends of the stator magnetic pole piece housed in the magnetic pole piece housing groove facing in the axial direction;
The magnetic gear according to claim 1, further comprising: a fastening member that fastens and fixes the magnetic pole piece mounting plate to the pair of magnetic pole piece support plates.   3. The magnetic gear according to claim 2, wherein the magnetic pole piece mounting plate is configured to be movable in a radial direction when the fastening by the fastening member is loosened.   4. The magnetic gear according to claim 3, further comprising air gap adjusting means for moving the pole piece mounting plate in a radial direction when the fastening by the fastening member is loosened.   5. The magnetism according to claim 1, wherein at least one of the first rotor and the second rotor is configured by a rotor that is fielded by a permanent magnet. 6. gear. It is a manufacturing method of the magnetic gear according to claim 5,
The first rotor and the second rotor arranged coaxially and side by side in the axial direction, and the pair of magnetic pole piece support plates arranged side by side in the axial direction and the first rotor and the above Disposing on both axial sides of the second rotor;
Each of the plurality of stator pole pieces is passed between the pair of pole piece support plates from the outer diameter side of the first rotor and the second rotor arranged side by side in the axial direction. And a step of fixing both ends of the child pole piece to the pair of pole piece support plates.

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