JP5817260B2 - Magnetic gear device - Google Patents

Description

  The present invention relates to a magnetic gear device in which two movers are provided between two yokes.

  There is a magnetic gear device as a gear device that does not wear and that generates less noise during operation. The rotating cylindrical magnetic gear device includes an outer rotor and an inner rotor provided in a cylinder of the outer rotor, and the outer rotor and the inner rotor each have a circumference of an outer peripheral surface of the inner rotor and an inner peripheral surface of the outer rotor. In the direction, a pair of magnetic poles each having an N pole and an S pole are arranged at substantially equal intervals.

  In such a magnetic gear device, the magnetic force generated by the magnetic pole pair of the inner rotor and the outer rotor is concentrated on a specific portion made of a soft magnetic material, thereby increasing the transmission torque between the rotors or changing the rotation direction of the rotor. An intermediate yoke intended to be changed may be provided between the outer rotor and the inner rotor (Non-Patent Document 1 and Non-Patent Document 2).

  When the outer rotor rotates in the circumferential direction, the inner rotor rotates in the circumferential direction due to the magnetic interaction between the magnetic pole pairs of the outer rotor and the inner rotor.

  Patent Document 1 discloses a magnetic drive device in which an iron intermediate yoke provided with unevenness is provided between internal and external permanent magnets. Here, in order to improve the performance of the magnetic drive device, it is desirable that the yoke effectively uses the magnetic flux generated from the magnet as much as possible. Therefore, the convex portion is made as close to the permanent magnet as possible, and the concave portion is made as thin as possible so that the magnetic flux passing through the concave portion is suppressed.

  On the other hand, the yoke may be configured to be provided inside or outside the internal and external permanent magnets. Patent Document 2 is made of a soft magnetic material, and is provided with a yoke having a plurality of concave portions and convex portions on the outer surface of the outer permanent magnet and facing the outer permanent magnet. A magnetic drive unit in which a yoke and a shaft are integrated is described.

JP-A-7-264838 JP-A-10-191621

K. Atallah, “Design, analysis and realization of a high-performance magnetic gear”, IEEE Proceedings-Electric Power Applications, UK, March 2004, vol. 151, 2143. Tetsuya Ikeda, Kenji Nakamura, Osamu Ichinokura, “A Study on Efficiency Improvement of Permanent Magnet Type Magnetic Gear”, Journal of Magnetic Society, 2009, 33, 2, 130-134

  However, the magnetic drive device according to Patent Document 1 has a problem that if the intermediate yoke in the concave portion is thinned, the strength of the intermediate yoke is reduced, causing a failure. Further, in the magnetic drive device according to Patent Document 2, since the internal permanent magnet, the soft magnetic body, and the shaft rotate integrally, the magnetic drive device rotates to a portion different from the magnet portion, the mass of the rotating portion increases, and the rotational moment increases. However, there is a problem that rapid acceleration / deceleration is difficult.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a magnetic gear device that prevents a failure and reduces the force required to move a mover made of a magnet.

A magnetic gear device according to the present invention includes a plurality of magnetic pole pairs arranged at substantially equal intervals along a specific direction, and includes a first mover and a second mover facing each other with a gap. In the apparatus, the first movable element is opposed to the first movable element with a gap, and the ferromagnetic part is disposed on a surface facing the first movable element, and the first magnetic part and the second movable element have a gap. opposed, strongly comprises a second magnetic portion magnetic portion is disposed on a surface facing the second movable element, on one surface and one surface of the second magnetic portion of the first magnetic portion, the ferromagnetic portion and the ferromagnetic A plurality of weak magnetic parts having weaker magnetism than the part are arranged at substantially equal intervals.

  The magnetic gear device according to the present invention is characterized in that the weak magnetic portion is made weaker in magnetism than the ferromagnetic portion by forming a groove or a hollow in a soft magnetic material.

  The magnetic gear device according to the present invention is configured such that the ferromagnetic portions disposed on one surface of the first magnetic portion and one surface of the second magnetic portion are opposed to each other via the first mover and the second mover. It is characterized by being.

  In the magnetic gear device according to the present invention, the first magnetic part and the second magnetic part are movable, and the first magnetic part and the ferromagnetic part of the second magnetic part move in the specific direction while facing each other. It is comprised so that it may be comprised.

  The magnetic gear device according to the present invention is characterized in that the first movable element or the second movable element can be fixed.

Magnetic gear device according to the present invention, the first movable element and the second movable element is cylindrical, wherein the first movable element and a second movable element, a plurality of said magnetic pole pairs in the circumferential direction The first magnetic part and the second magnetic part are provided with the plurality of ferromagnetic parts and weak magnetic parts along a circumferential direction, and the specific direction is determined by the first mover and the second magnetic part. It is comprised so that it may become the circumferential direction of 2 needle | mover.

Magnetic gear device according to the present invention, the first movable element and the second movable element is a disc-shaped, wherein the first movable element and a second movable element, each radial to the plurality of pole pairs are provided And the first magnetic part and the second magnetic part are provided with a plurality of the ferromagnetic parts and weak magnetic parts radially, and the specific direction is a circumference of the first movable part and the second movable part. It is configured to be in a direction.

  In the magnetic gear device according to the present invention, the first mover and the second mover are plate-like in the same moving direction, and the first mover and the second mover are the first mover and the second mover. A plurality of the magnetic pole pairs are provided along a direction in which the two movers move, and a plurality of the first magnetic part and the second magnetic part are provided along the direction in which the first mover and the second mover move. The ferromagnetic portion and the weak magnetic portion are provided, and the specific direction is a direction in which the first mover and the second mover move.

  In the magnetic gear device according to the present invention, the first mover and the second mover are cylindrical, and the first mover and the second mover are central axes of the first mover and the second mover. A plurality of the magnetic pole pairs are provided along a direction, and the first magnetic part and the second magnetic part include a plurality of the ferromagnetic parts along a central axis direction of the first mover and the second mover, and A weak magnetic part is provided, and the specific direction is a central axis direction of the first movable element and the second movable element.

  In the magnetic gear device according to the present invention, the number of the ferromagnetic portions arranged on one surface of the first magnetic portion and one surface of the second magnetic portion is equal to the number of magnetic pole pairs of the first mover and the second mover. It is the sum or difference of

  In the magnetic gear device according to the present invention, the number of the ferromagnetic portions arranged on one surface of the first magnetic portion and the one surface of the second magnetic portion per predetermined unit length is about the predetermined unit length. It is the sum or difference of the number of magnetic pole pairs of the first mover and the second mover.

  According to the magnetic gear device of the present invention, the two movers are separated from the two magnetic portions provided outside the two movers, and the two magnetic portions face the mover. Since a plurality of ferromagnetic parts made of a soft magnetic material and a plurality of weak magnetic parts showing magnetism weaker than the soft magnetic material are arranged, failure can be prevented and the two movers can be moved efficiently.

  In the present invention, the ferromagnetic portion is a portion in which the soft magnetic material is close to the magnet and the magnetic resistance of the magnet and the soft magnetic material is reduced, while the weak magnetic portion is a concave portion. Or by providing a cavity or a slit so that the magnetic resistance is relatively higher than that of the ferromagnetic portion.

It is a typical assembly drawing of the magnetic gear apparatus which concerns on 1st Embodiment. It is a typical sectional view of the magnetic gear device concerning a 1st embodiment. It is explanatory drawing about the flow of the magnetic flux of a magnetic gear apparatus. It is the schematic diagram shown about the inner peripheral surface of an outer side magnetic body column. It is the schematic diagram shown about the inner peripheral surface of an outer side magnetic body column. It is the schematic diagram shown about the inner peripheral surface of an outer side magnetic body column. It is the schematic diagram shown about the inner peripheral surface of an outer side magnetic body column. It is a typical assembly drawing which shows the magnetic gear apparatus which concerns on 2nd Embodiment. It is a typical assembly drawing which shows the magnetic gear apparatus which concerns on 3rd Embodiment. It is a typical assembly drawing which shows the magnetic gear apparatus which concerns on 4th Embodiment. It is sectional drawing of the longitudinal direction which shows the magnetic gear apparatus which concerns on 4th Embodiment.

First Embodiment A magnetic gear device according to the present embodiment will be described below. The magnetic gear device according to the present embodiment is a rotating cylindrical type. 1 and 2 are a schematic assembly view and a schematic cross-sectional view of the magnetic gear device according to the first embodiment.

  The magnetic gear device according to the present embodiment includes an inner rotor 1 that is a cylindrical mover in which six magnetic pole pairs including N-pole magnets and S-pole magnets 1a and 1b are arranged along the circumferential direction. Prepare. These magnets are magnetized in the radial direction, and the magnetic poles are different from each other on the inner peripheral surface and the outer peripheral surface. That is, the part constituting the magnet 1a is magnetized with the N pole on the outer peripheral surface side and the S pole on the inner peripheral surface side, and the magnet 1b is magnetized with the S pole on the outer peripheral surface side and the N pole on the inner peripheral surface side.

  On the outer periphery of the inner rotor 1, an outer rotor 2 is provided that is a mover that is cylindrical and fits in the inner cavity with a gap. The outer rotor 2 is magnetized in the thickness direction, and 14 magnetic pole pairs of magnets 2a and 2b having different magnetic poles on the inner peripheral surface and the outer peripheral surface are arranged along the circumferential direction.

Next, on the outer peripheral side of the outer rotor 2, there is provided an outer magnetic column 3 that is also cylindrical and is configured such that the outer rotor 2 is fitted in the inner cavity with a gap. The outer magnetic column 3 is fixed so as not to rotate regardless of whether the inner rotor 1 and the outer rotor 2 are rotating. The outer magnetic column 3 is made of a silicon steel plate, and 20 convex portions 3a and concave portions 3b are provided in the circumferential direction at substantially equal intervals.

On the inner peripheral side of the inner rotor 1, there is provided an inner magnetic column 4 that is cylindrical and is configured to fit inside the inner rotor 1 with a gap. The inner magnetic column 4 is also made of a silicon steel plate, like the outer magnetic column 3, and has 20 convex portions 4a and concave portions 4b formed with substantially U-shaped grooves on the outer peripheral surface at substantially equal intervals. It is provided in the circumferential direction. Similarly to the outer magnetic column 3, the inner magnetic column 4 is fixed so as not to rotate.

  When the outer rotor 2 rotates, the inner rotor 1 rotates due to the magnetic interaction between the magnets 1 a and 1 b of the inner rotor 1 and the magnets 2 a and 2 b of the outer rotor 2. In this case, the inner rotor 1 having fewer magnetic pole pairs than the outer rotor 2 rotates at a higher rotational speed than the outer rotor 2 in the direction opposite to the rotation direction of the outer rotor 2.

  The gear ratio of the inner rotor 1 and the outer rotor 2 is determined by the number of magnetic pole pairs provided in each of the inner rotor 1 and the outer rotor 2. Since the inner rotor 1 according to the present embodiment has six magnetic pole pairs and the outer rotor 2 has 14 magnetic pole pairs, the gear ratio is 3/7. Therefore, when the outer rotor 2 rotates once in the clockwise direction, the inner rotor 1 rotates 7/3 in the counterclockwise direction.

  Further, the convex portions 3 a and 4 a and the concave portions 3 b and 4 b of the inner magnetic column 4 and the outer magnetic column 3 are disposed so as to face each other with the inner rotor 1 and the outer rotor 2 interposed therebetween. FIG. 3 is an explanatory diagram of the magnetic flux flow of the magnetic gear device. Magnetic flux is generated by the magnetic poles of the inner rotor 1 and the outer rotor 2. This magnetic flux is generated by one magnet 1 a of the inner rotor 1, one magnet 2 a of the outer rotor 2, one projection 3 a of the outer magnetic column 3, another projection 3 a of the outer magnetic column 3, and the outer rotor 2. The other magnet 2b, the other magnet 1b of the inner rotor 1, the one convex portion 4a of the inner magnetic column 4, the other convex portion 4a of the inner magnetic column 4 are returned to the one magnet 1a of the inner rotor 1, A magnetic path is formed.

  Here, it is desirable that the difference in magnetic resistance between the convex portions 3a and 4a that are ferromagnetic portions and the concave portions 3b and 4b that are weak magnetic portions in the outer magnetic column 3 and the inner magnetic column 4 is larger. If the magnetic resistance is large, the magnetic flux selectively passes through the ferromagnetic portion, so that magnetic flux generated from the magnetic poles of the inner rotor 1 and the outer rotor 2 can be used effectively, and a magnetic gear with extremely high transmission efficiency can be configured. .

  When the convex portions of the outer magnetic column 3 and the inner magnetic column 4 are opposed to each other so as to sandwich the inner rotor 1 and the outer rotor 2, the ferromagnetic portions of the outer magnetic column 3 and the inner magnetic column 4 are opposed to each other. And the magnetic resistance difference between the weak magnetic portions can be further increased.

  Since the outer magnetic body column 3 and the inner magnetic body column 4 are composed of a silicon steel plate that is a soft magnetic body, the convex portions 3a and 4a that are close to the magnetic pole pair function as pole pieces, and the convex portions 3a and 4a Magnetic flux concentrates on 4a. At this time, it is desirable that the magnetic path is not affected by other magnetic paths as much as possible. Accordingly, the convex portion 4a of the inner magnetic column 4 and the convex portion 3a of the outer magnetic column 3 are configured to face each other.

  Next, the reason why the number of the convex portions 3a, 4a and the concave portions 3b, 4b on the inner peripheral surface of the outer magnetic column 3 and the outer peripheral surface of the inner magnetic column 4 is 20 will be described.

  When the inner rotor 1 and the outer rotor 2 rotate, an alternating magnetic field is generated in the radial direction along with the rotation. When the number of magnetic pole pairs of the inner rotor 1 is Ph, the number of magnetic pole pairs of the outer rotor 2 is Pl, and the number of pole pieces is Ns, the alternating magnetic field is mainly Ph-order, (Ns-Ph) -order and (Ns + Ph) -order components. Is known to exist (Non-Patent Document 2).

  The case where the transmission torque between the inner rotor 1 and the outer rotor 2 is maximized is the case where it synchronizes with an alternating magnetic field including these three harmonic components. In this case, for example, the number of the protrusions 4a and the recesses 4b on the outer peripheral surface of the inner magnetic column 4 is (Pl + Ph) or (Pl−Ph). Therefore, in the present embodiment, in order to maximize the transmission torque between the inner rotor 1 and the outer rotor 2, the protrusions 3 a and the recesses 3 b on the inner peripheral surface of the outer magnetic column 3 and the outer periphery of the inner magnetic column 4. The number of convex portions 4a and concave portions 4b on the surface is 20 as the sum of the magnetic pole pairs of the inner rotor 1 and the outer rotor 2 respectively. The number of the convex portions 3a and 4a and the concave portions 3b and 4b may be eight, which is the difference between the magnetic pole pairs of the inner rotor 1 and the outer rotor 2.

  Since the magnetic force is not greatly attenuated, the gap between the inner magnetic column 4 and the inner rotor 1, the gap between the inner rotor 1 and the outer rotor 2, and the gap between the outer rotor 2 and the outer magnetic column 3 are sufficiently small. It is comprised so that it may become.

  In the present embodiment, the magnetic pole pair is composed of two magnets magnetized in the radial direction, but is not limited to this configuration. One magnet may be magnetized in the radial direction in the order of the N pole and the S pole along the circumference to form one magnetic pole pair. Further, a ring magnet having a known radial anisotropic orientation may be magnetized in the radial direction with N and S poles.

  The magnetic gear device according to the present embodiment may change the relative rotational speed of the outer rotor 2 with respect to the inner rotor 1 by rotating the outer magnetic column 3 and the inner magnetic column 4. The outer magnetic column 3 and the inner magnetic column 4 rotate the same number of times in the same direction so that the convex portions 3a and 4a face each other and the concave portions 3b and 4b face each other. For example, when both the outer magnetic column 3 and the inner magnetic column 4 are rotated clockwise by one third while the inner rotor 1 makes one clockwise rotation, the inner rotor 1 has the outer magnetic column 3 and the inner magnetic member. The relative relationship with column 4 is only 2/3 rotation. Therefore, the outer rotor 2 rotates 7/3 × 2/3 = 14/9 counterclockwise.

  By adjusting the rotational speed of the outer rotor 2 in this way, the relative rotational speed of the outer rotor 2 with respect to the inner rotor 1 can be changed.

  Alternatively, the outer rotor 2 may be fixed, and the inner rotor 1 may rotate as the outer magnetic column 3 and the inner magnetic column 4 rotate. In this case, when the outer magnetic column 3 and the inner magnetic column 4 make one clockwise rotation, the inner rotor 1 rotates 1 + 7/3 = 10/3 clockwise.

  The inner rotor 1 may be fixed, and the outer rotor 2 may rotate as the outer magnetic column 3 and the inner magnetic column 4 rotate. In this case, when the outer magnetic column 3 and the inner magnetic column 4 rotate 10/3 clockwise, the outer rotor 2 rotates 10 / 3-1 = 7/3 clockwise.

  The convex portion 3a and the concave portion 3b of the outer magnetic column 3 according to the present embodiment are not limited to the configuration described above. 4 to 7 are schematic views showing the inner peripheral surface of the outer magnetic column 3. For example, the groove of the concave portion 3b is not limited to a substantially U-shaped cross section, and a V-shaped groove may be formed as shown in FIG. 4A, and a U-shaped groove is formed as shown in FIG. 4B. It may be.

  As shown in FIG. 5C, the shape of the inner peripheral surface of the outer magnetic column 3 may be such that the recess 3b is eliminated and the hollow portions 3c are provided at substantially equal intervals inside. As shown in FIG. 5D, the hollow portion 3 c may be provided in a radial double manner, or may be triple or more. When the hollow portions 3c are provided in two or more layers, the magnetic flux flows between the two hollow portions 3c, so that the magnetic flux can be prevented from spreading in the outer magnetic column 3.

  Furthermore, as shown to FIG. 6E, you may comprise so that the hollow part 3c may be further provided in the radial direction of the outer side magnetic body column 3 provided with the recessed part 3b.

  In this manner, the inner peripheral surface of the outer magnetic column 3 is provided with a groove or a hollow in the ferromagnetic portion that is not limited to the convex portion 3a and is formed of a soft magnetic material, and not only in the concave portion 3b. The weak magnetic part weaker than the magnetism of the soft magnetic material may be disposed. The ferromagnetic part and the weak magnetic part may have different widths, and as shown in FIG. 6F, the weak magnetic part may be filled with a groove or a hollow part with a nonmagnetic material 3d.

  In addition, grooves may be provided on the surfaces of the outer magnetic column 3 and the inner magnetic column 4, and a nonmagnetic layer 3e made of a nonmagnetic material may be provided therein. The shape of the nonmagnetic layer 3e may be flat as shown in FIG. 7G, or may be uneven as shown in FIG. 7H.

  The outer peripheral surface of the inner magnetic column 4 may have the same configuration as the inner peripheral surface of the outer magnetic column 3 as shown in FIGS.

  The material of the outer magnetic column 3 and the inner magnetic column 4 may be a soft magnetic material, and is not limited to a silicon steel plate, and may be iron, a permender, an amorphous metal, or the like.

  In order to form the magnetic path of the magnetic gear, it is necessary to provide yokes inside and outside the two rotors. However, according to the magnetic gear device according to the present embodiment, since the outer magnetic column 3 and the inner magnetic column 4 serve as yokes, it is not necessary to provide further yokes. Therefore, the mass of the inner rotor 1 and the outer rotor 2 can be reduced, the rotational moment can be reduced, and the rotation can be performed with a small force.

  Further, since the outer magnetic column 3 and the inner magnetic column 4 are respectively provided outside the outer rotor 2 and inside the inner rotor 1, the thicknesses of the outer magnetic column 3 and the inner magnetic column 4 are recessed. Even 3b and 4b can be made sufficiently thick to such an extent that there is no problem in strength. Therefore, according to the magnetic gear device according to the present embodiment, it is possible to prevent a failure due to the breakage of the magnetic column.

  Furthermore, according to the magnetic gear device according to the present embodiment, the convex portions 3a and 4a of the outer magnetic column 3 and the inner magnetic column 4 face each other, and the concave portions 3b and 4b face each other. Can be suppressed. When the number of each of the convex portions 3a and 4a and the concave portions 3b and 4b is the sum or difference of the magnetic pole pairs of the inner rotor 1 and the outer rotor 2, the torque transmission efficiency can be further improved.

Second Embodiment A second embodiment will be described. The magnetic gear device according to the present embodiment is a disc rotation type magnetic gear device.

FIG. 8 is a schematic assembly view showing the magnetic gear device according to the second embodiment. The magnetic gear device according to the present embodiment includes a disk-shaped lower rotor 5 in which six magnetic pole pairs including N-pole and S-pole magnets 5a and 5b are radially arranged. The magnetic pole pair composed of the magnets 5a and 5b has different magnetic poles on the same plane. That is, the upper surface side of the portion constituting the magnet 5a is magnetized to the N pole and the lower surface side is magnetized to the S pole, and the portion constituting the magnet 5b is magnetized to the S pole on the upper surface side and the N pole on the lower surface side.

  Above the lower rotor 5, there is provided an upper rotor 6 that is disk-shaped and is arranged coaxially with the lower rotor 5 with a gap. The upper rotor 6 has 14 magnetic pole pairs made up of magnets 6a and 6b magnetized in the thickness direction.

  Above the upper rotor 6, there is provided an upper magnetic column 7 that is also in the shape of a disk and is arranged coaxially with the lower rotor 5 with a gap. The upper magnetic column 7 is fixed so as not to rotate regardless of whether the upper rotor 6 and the lower rotor 5 are rotating. The upper magnetic column 7 has 20 convex portions 7a and concave portions 7b provided radially at substantially equal intervals.

  Below the lower rotor 5, there is provided a lower magnetic column 8 that is also in the shape of a disk and is arranged coaxially with the lower rotor 5 with a gap.

  The lower magnetic column 8 is also fixed so as not to rotate, and 20 convex portions 8a and concave portions 8b, which are the sum of magnetic pole pairs, are provided radially at substantially equal intervals. Further, the convex portions 7a and 8a of the upper magnetic column 7 and the lower magnetic column 8 face each other, and the concave portions 7b and 8b face each other.

  When the upper rotor 6 rotates, the lower rotor 5 rotates in the opposite direction to the upper rotor 6 due to the magnetic interaction between the magnets 5 a and 5 b of the lower rotor 5 and the magnets 6 a and 6 b of the upper rotor 6.

  The number of the convex portions 7a, 8a and the concave portions 7b, 8b may be eight, which is the difference between the magnetic pole pairs of the lower rotor 5 and the upper rotor 6.

Third Embodiment A third embodiment will be described. The magnetic gear device according to the present embodiment is a flat linear magnetic gear device.

  FIG. 9 is a schematic assembly view showing a magnetic gear device according to a third embodiment. FIG. 9 shows a part of a flat linear magnetic gear device.

The magnetic gear device according to the present embodiment includes a lower plate 9 having a rectangular plate shape in which six magnetic pole pairs including N-pole and S-pole magnets 9a and 9b are arranged per unit length in the longitudinal direction. The magnetic pole pair composed of the magnets 9a and 9b has different magnetic poles on the same plane. That is, the portion constituting the magnet 9a is magnetized with the N pole on the upper surface side and the S pole on the lower surface side, and the portion constituting the magnet 9a is magnetized with the S pole on the upper surface side and the N pole on the lower surface side.

  Above the lower plate 9, there is provided an upper plate 10 having a rectangular plate shape, extending in substantially the same longitudinal direction with respect to the lower plate 9 and arranged with a gap. The upper plate 10 has 14 magnetic pole pairs each composed of an N-pole magnet and an S-pole magnet magnetized in the thickness direction.

  Above the upper plate 10, there is provided an upper magnetic column 11 having a rectangular plate shape, extending substantially parallel to the lower plate 9 and arranged with a gap. The upper magnetic column 11 is fixed so as not to move regardless of whether the lower plate 9 and the upper plate 10 are moving. The upper magnetic column 11 is provided with 20 convex portions 11a and concave portions 11b per unit length in the longitudinal direction at substantially equal intervals.

  Below the lower plate 9, there is provided a lower magnetic column 12 that is also a rectangular plate and extends substantially parallel to the lower plate 9 and is disposed with a gap.

  The lower magnetic column 12 is also fixed so as not to move, and is the sum of the magnetic pole pairs per unit length of the lower plate 9 and the upper plate 10, and 20 convex portions 12a and concave portions 12b per unit length. Are provided in the longitudinal direction at substantially equal intervals. Further, the convex portions 12a and 11a of the lower magnetic column 12 and the upper magnetic column 11 are opposed to each other, and the concave portions 12b and 11b are opposed to each other. The number of the convex portions 11a, 12a and the concave portions 11b, 12b per unit length may be eight, which is the difference between the magnetic pole pairs of the lower plate 9 and the upper plate 10.

  When the upper plate 10 moves in the longitudinal direction, the lower plate 9 moves in the longitudinal direction due to the magnetic interaction between the magnets 9 a and 9 b of the lower plate 9 and the magnets 10 a and 10 b of the upper plate 10. In addition, the shape of the lower plate 9, the upper plate 10, the upper magnetic column 11, and the lower magnetic column 12 in the present embodiment is not limited to a rectangle, and in this case, the above-described longitudinal direction is the lower plate 9, The direction in which the upper plate 10 moves is indicated.

Fourth Embodiment A fourth embodiment will be described. The magnetic gear device according to the present embodiment is a cylindrical linear magnetic gear device.

  10 and 11 are a schematic assembly view and a longitudinal sectional view showing a magnetic gear device according to a fourth embodiment. 10 and 11 show the unit length of a cylindrical linear magnetic gear device.

The magnetic gear device according to the present embodiment includes a cylindrical inner cylinder 13 in which six magnetic pole pairs including N-pole and S-pole magnets 13a and 13b are arranged per unit length in the central axis direction. The magnetic pole pair composed of the magnets 13a and 13b has different magnetic poles on the same plane. That is, the portion constituting the magnet 13a is magnetized with the N pole on the outer surface and the S pole on the inner surface, and the portion constituting the magnet 13b is magnetized with the S pole on the outer surface and the N pole on the inner surface.

  Outside the inner cylinder 13 is provided an outer cylinder 14 which is cylindrical and extends substantially coaxially with the inner cylinder 13 and is disposed with a gap. The outer cylinder 14 has 14 magnetic pole pairs made up of N pole magnets and S pole magnets magnetized in the thickness direction per unit length along the central axis direction of the cylinder.

  Outside the outer cylinder 14 is provided an outer magnetic column 15 which is also cylindrical and extends substantially coaxially with the inner cylinder 13 and is disposed with a gap. The outer magnetic column 15 is fixed so as not to move regardless of whether the inner cylinder 13 and the outer cylinder 14 are moving. Twenty convex portions 15a and concave portions 15b per unit length, which is the sum of the number of magnetic pole pairs per unit length of the inner cylinder 13 and the outer cylinder 14, are arranged along the central axis of the cylinder at substantially equal intervals. Is provided.

  Inside the inner cylinder 13, there is provided an inner magnetic column 16 that is also cylindrical and disposed with a gap substantially coaxial with the inner cylinder 13.

  The inner magnetic column 16 is also fixed so as not to move, and 20 convex portions 16a and concave portions 16b per unit length, which is the sum of magnetic pole pairs per unit length of the inner cylinder and the outer cylinder, are arranged at substantially equal intervals. It is provided in the longitudinal direction. The convex portions 15a and 16a of the outer magnetic column 15 and the inner magnetic column 16 are arranged to face each other, and the concave portions 15b and 16b are also arranged to face each other. Note that the number of the convex portions 15a, 16a and the concave portions 15b, 16b per unit length may be eight, which is the difference between the magnetic pole pairs of the inner cylinder 13 and the outer cylinder 14.

  When the outer cylinder 14 moves, the inner cylinder 13 moves along the central axis of the cylinder due to the magnetic interaction between the magnets 13a and 13b of the inner cylinder 13 and the magnets 14a and 14b of the outer cylinder 14.

  In addition, the material of the magnet used for the magnetic gear apparatus of this invention is not specifically limited. In order to obtain a high transmission torque, it is desirable to use an Nd—Fe—B based sintered magnet, and a resin molded magnet may be used to suppress eddy current. In addition, the magnet material of a 1st needle | mover and a 2nd needle | mover may differ.

  The embodiments disclosed herein are illustrative in all respects and should not be considered as restrictive. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Inner rotor 2 Outer rotor 3 Outer magnetic material column 4 Inner magnetic material column 5 Lower rotor 6 Upper rotor 7 Upper magnetic material column 8 Lower magnetic material column 9 Lower plate 10 Upper plate 11 Upper magnetic material column 12 Lower magnetic material Body column 13 Inner cylinder 14 Outer cylinder 15 Outer magnetic column 16 Inner magnetic column 1a, 1b, 2a, 2b, 5a, 5b, 6a, 6b, 9a, 9b, 10a, 10b, 13a, 13b, 14a, 14b Magnet
3a, 4a, 7a, 8a, 11a, 12a, 15a, 16a Convex part 3b, 4b, 7b, 8b, 11b, 12b, 15b, 16b Concave part 3c Hollow part 3d Nonmagnetic material 3e Nonmagnetic layer

Claims (11)

In a magnetic gear device including a plurality of magnetic pole pairs arranged at substantially equal intervals along a specific direction and having a first mover and a second mover facing each other with a gap,
The first mover is opposed to the first mover with a gap, and the ferromagnetic part is opposed to the first mover with the first magnetic part disposed on one surface facing the first mover, and the second mover is opposed to the first mover , a second magnetic portion ferromagnetic portion are arranged on a surface facing the second movable element,
A magnetic gear characterized in that a plurality of ferromagnetic portions and weak magnetic portions that are weaker than the ferromagnetic portions are arranged at substantially equal intervals on one surface of the first magnetic portion and one surface of the second magnetic portion. apparatus. 2. The magnetic gear device according to claim 1, wherein the weak magnetic portion has a magnetism weaker than the ferromagnetic portion by forming a groove or a hollow in a soft magnetic material. The first ferromagnetic part and the ferromagnetic part disposed on one surface of the second magnetic part are configured to face each other with the first movable element and the second movable element interposed therebetween. The magnetic gear device according to 1 or 2. The first magnetic part and the second magnetic part are movable, and are configured to move in the specific direction while the ferromagnetic parts of the first magnetic part and the second magnetic part face each other. The magnetic gear device according to claim 3. The magnetic gear device according to any one of claims 1 to 4, wherein the first movable element or the second movable element is fixable. The first mover and the second mover are cylindrical,
Wherein the first movable element and a second movable element, Yes plurality of said magnetic pole pairs in the circumferential direction is provided,
The first magnetic part and the second magnetic part are provided with the plurality of ferromagnetic parts and weak magnetic parts along a circumferential direction,
The magnetic gear device according to any one of claims 1 to 5, wherein the specific direction is configured to be a circumferential direction of the first movable element and the second movable element. The first mover and the second mover are disk-shaped,
Wherein the first movable element and a second movable element, Yes in each plurality of said magnetic pole pairs radially provided,
The first magnetic part and the second magnetic part are provided with a plurality of ferromagnetic parts and weak magnetic parts radially,
The magnetic gear device according to any one of claims 1 to 5, wherein the specific direction is configured to be a circumferential direction of the first movable element and the second movable element. The first mover and the second mover are plate-like in the same moving direction,
The first mover and the second mover are provided with a plurality of the magnetic pole pairs along a direction in which the first mover and the second mover move.
The first magnetic part and the second magnetic part are provided with a plurality of ferromagnetic parts and weak magnetic parts along a direction in which the first and second movers move.
The magnetic gear device according to claim 1, wherein the specific direction is a direction in which the first mover and the second mover move. The first mover and the second mover are cylindrical,
The first movable element and the second movable element are provided with a plurality of the magnetic pole pairs along the central axis direction of the first movable element and the second movable element,
The first magnetic part and the second magnetic part are provided with a plurality of the ferromagnetic parts and weak magnetic parts along the central axis direction of the first and second movers,
The magnetic gear device according to claim 1, wherein the specific direction is a central axis direction of the first mover and the second mover. The number of the ferromagnetic portions arranged on one surface of the first magnetic portion and the one surface of the second magnetic portion is the sum or difference of the number of magnetic pole pairs of the first mover and the second mover. The magnetic gear device according to claim 6 or 7. The number of the ferromagnetic portions arranged on one surface of the first magnetic portion and the one surface of the second magnetic portion per predetermined unit length is the first movable element and the second movable portion per the predetermined unit length. The magnetic gear device according to claim 8 or 9, wherein the magnetic gear device is the sum or difference of the number of magnetic pole pairs of the child.

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