JP6577300B2 - Magnetic levitation attitude control device - Google Patents

Description

  The present invention relates to a magnetic levitation posture control apparatus suitable for posture control of a levitation rotor.

  A magnetic levitation device is known in which a rotor is magnetically levitated and rotated in a non-contact state with respect to a stator. Since the magnetic levitation device has a structure that does not use a mechanical bearing, it is expected to be applied to a centrifugal pump motor for an artificial heart in the medical field.

  Here, for example, in Patent Document 1, a primary coil of a stationary electromagnet and a secondary coil of a floating electromagnet are coupled by magnetic field covalent coupling, and power is efficiently contactlessly fed from the primary side to the secondary side. A magnetic levitation device is proposed. In this magnetic levitation device, the input frequency of the stationary electromagnet is set in the vicinity of the resonance frequency f1 (<f0) of the magnetic field resonance coupling. In addition, the suction force that balances the gravity of the levitated body is set in a range in which self-equilibration is maintained in accordance with the increase and decrease of the gap between the levitated body and the stationary side. Thereby, since the self-equilibrium of the floating body is maintained, a control mechanism for stably floating the floating body becomes unnecessary.

  However, in this magnetic levitation apparatus, the levitation body is supported by the coupling of the primary coil and the secondary coil by the magnetic field covalent coupling. For this reason, energy is expended on the levitating body, resulting in low energy efficiency.

  As a solution to such a problem, there is an AC magnetic levitation method disclosed in Patent Document 2. This is to install a permanent magnet on the levitated body and adjust the magnetic coupling force, which is the levitating force generated between the primary coil and the secondary coil by the pulsating current of the primary coil, by controlling the impedance of the secondary coil. .

JP 2014-175595 A JP 2003-338415 A

  In the AC magnetic levitation method described in Patent Document 2, by installing a permanent magnet on the levitated body, it is possible to maintain the self-equilibration of the levitated body even at low energy, and to stably levitate the levitated body Can do.

  However, in this magnetic levitation method, the attitude control in the direction (axial direction) along the rotation axis of the levitated body is possible, but it is generated between the secondary coil by controlling the current flowing in the secondary coil. Therefore, there is a problem that the magnetic coupling force needs to be adjusted and the configuration becomes complicated.

  In addition, in this magnetic levitation method, the magnetic coupling force generated between the secondary coil and the secondary coil is adjusted to maintain the self-equilibration of the levitation body. Orientation control cannot be performed.

  In this case, it is conceivable to provide a posture control mechanism that performs posture control in a direction (radial direction) perpendicular to the rotating shaft of the floating body on the stationary side. Specifically, a plurality of electromagnets that attract the floating body in a direction (radial direction) perpendicular to the rotation axis are arranged on the stationary side so as to surround the floating body.

  However, this makes it possible to control the attitude in the direction (radial direction) perpendicular to the rotating shaft of the levitating body, but the outer diameter on the stationary side becomes large, and the magnetic levitation system is prevented from becoming large. The problem of not being able to occur.

  In view of the above, an object of the present invention is to provide a magnetic levitation posture control device capable of controlling the posture of a levitation rotor with a simple configuration.

The magnetic levitation posture control apparatus according to the present invention includes a levitation rotor facing the electromagnetic induction stator. The electromagnetic induction stator includes a first magnet for generating an induced current and a second magnet for generating a Lorentz force. And the floating rotor has first and third conductor portions that cross the magnetic field of the first magnet, and a second coil portion that crosses the magnetic field of the second magnet. Is wound on the floating rotor by the induced current flowing through the first or third conductor portion and the magnetic field of the second magnet traversed by the second conductor portion by the rotation of the floating rotor. It is comprised so that the Lorentz force toward a direction or an axial direction may generate | occur | produce.
In this configuration, due to the rotation of the floating rotor, an induced current flows through the secondary coil on the floating rotor side by the magnetic field of the first magnet on the electromagnetic induction stator side. Then, a Lorentz force in the radial direction or the axial direction is generated in the floating rotor by the magnetic field generated by the second magnet on the electromagnetic induction stator side and the induced current flowing through the secondary coil. As a result, the attitude control in the radial direction or the axial direction on the floating rotor side can be performed by the secondary coil that generates the Lorentz force.
The secondary coil is disposed on a surface facing the electromagnetic induction stator, and the first conductor portion extends from a rotation center axis side of the floating rotor toward an outer peripheral side, and the second conductor portion Extending in the circumferential direction of the levitation rotor, the third conductor portion is wound so as to extend from the outer peripheral side of the levitation rotor toward the rotation center axis side, and the first magnet includes the first and The third conductor portion is disposed at a position where the third conductor portion passes, and the second magnet is disposed at a position where the second conductor portion passes.
In this configuration, the first and third conductor portions on the floating rotor side can pass the magnetic field generated by the first magnet on the electromagnetic induction stator side. Further, the second conductor portion on the floating rotor side can pass the magnetic field of the second magnet on the electromagnetic induction stator side. Moreover, the secondary coil is arrange | positioned on the surface facing an electromagnetic induction stator. For this reason, radial Lorentz force can be generated in the floating rotor.
The secondary coil is disposed on an outer peripheral surface, the first conductive wire portion extends from one surface side to the other surface side of the floating rotor, and the second conductive wire portion extends in the outer peripheral direction of the floating rotor. And the third conductor portion is wound so as to extend from the other surface side of the floating rotor to the one surface side, and the first and third conductor portions pass through the first magnet. The second magnet is disposed at a position where the second conductor portion passes.
In this configuration, a magnetic field of the first magnet on the electromagnetic induction stator side is formed between the floating rotor. For this reason, for example, when only the first conductor portion is disposed on the surface facing the electromagnetic induction stator, only the first conductor portion can pass the magnetic field of the first magnet on the electromagnetic induction stator side, An induced current in only one direction can flow through the secondary coil.
The magnetic levitation posture control device of the present invention includes a levitation rotor and an energy transmission stator that faces the levitation rotor, and a secondary coil is wound around an outer peripheral surface of the levitation rotor. A primary coil wound so as to be concentric with the secondary coil and a magnet facing the secondary coil are disposed, and flows to the secondary coil accompanying a change in the magnetic field of the primary coil. The present invention is characterized in that a Lorentz force directed in a radial direction or an axial direction is generated in the floating rotor by an induced current and a magnetic field of the magnet traversed by the secondary coil.
In this configuration, an induced current flows through the secondary coil on the floating rotor side due to a change in the magnetic field of the primary coil on the energy transmission stator side. Further, a Lorentz force in the radial direction or the axial direction is generated in the floating rotor by the magnetic field generated by the magnet on the energy transmission stator side and the induced current flowing through the secondary coil. And the attitude | position control of the radial direction or axial direction at the side of a floating rotor is attained by the secondary coil which generate | occur | produces Lorentz force.
In addition, the energy transmission stator is provided with a cylinder portion that accommodates the floating rotor and on which the primary coil is wound on an outer peripheral surface, and further, the magnetic poles of the magnet and the energy transmission stator of the floating rotor The secondary coil is directed to a facing surface, and is configured to be positioned inside the primary coil.
In this configuration, an induced current flows through the secondary coil on the floating rotor side due to a change in the magnetic field of the primary coil on the energy transmission stator side. Further, a radial Lorentz force can be generated in the floating rotor by a magnet whose magnetic pole is directed to the surface facing the energy transmission stator of the floating rotor and an induced current flowing through the secondary coil.
Further, the energy transmission stator is provided with a cylindrical portion around which the primary coil is wound on an outer peripheral surface, and the magnetic pole of the magnet is directed to a surface facing the energy transmission stator of the floating rotor, The floating rotor is provided with a recess into which the cylindrical portion is fitted, and the secondary coil is configured to be located outside the primary coil.
In this configuration, the secondary coil on the floating rotor side is configured to be located outside the primary coil on the energy transmission stator side. Even in this case, an induced current flows through the secondary coil on the floating rotor side due to a change in the magnetic field of the primary coil on the energy transmission stator side. Further, a radial Lorentz force can be generated in the floating rotor by a magnet whose magnetic pole is directed to the surface facing the energy transmission stator of the floating rotor and an induced current flowing through the secondary coil.
Further, the energy transmission stator is provided with a cylindrical portion around which the primary coil is wound on an outer peripheral surface, and a flange portion that covers the outer periphery of the cylindrical portion and on which the magnet is disposed on the inner side, and the floating rotor Is provided with a recess into which the cylindrical portion is fitted, the secondary coil is positioned outside the primary coil, and the magnetic pole of the magnet is directed toward the outer peripheral surface of the floating rotor. It is characterized by being.
In this configuration, an induced current flows through the secondary coil on the floating rotor side due to a change in the magnetic field of the primary coil on the energy transmission stator side. Also, the Lorentz force in the axial direction can be generated in the floating rotor by the magnet whose magnetic pole is directed toward the outer peripheral surface of the floating rotor and the induced current flowing through the secondary coil.
In addition, an induced current in only one direction rectified by a rectifier circuit flows in the secondary coil.
In this configuration, an induced current in only one direction rectified by the rectifier circuit flows in the secondary coil on the floating rotor side. For this reason, in the radial direction, for example, only the Lorentz force toward the rotation center axis can be generated. Also, only the Lorentz force can be generated in either direction in the axial direction.

  According to the magnetic levitation attitude control device of the present invention, the attitude control of the levitation rotor can be performed with a simple configuration because the attitude control in the radial direction or the axial direction on the levitation rotor side can be performed by the secondary coil that generates the Lorentz force. It can be performed.

The principle of the magnetic levitation posture control device of the present invention is explained, and FIG. 4A is a diagram for explaining the outline when Lorentz force is generated in the radial direction of the levitation rotor by the electromagnetic induction method. Fig. (B) is a diagram for explaining the outline when Lorentz force is generated in the axial direction of the floating rotor by the electromagnetic induction method. Fig. (C) is a diagram showing Lorentz force generated in the radial direction by the energy transmission method. FIG. 4D is a diagram for explaining the outline when Lorentz force is generated in the axial direction of the floating rotor by the electromagnetic induction method. It is a perspective view which shows an example of 1st Embodiment of the magnetic levitation posture control apparatus of this invention. It is a perspective view which shows the magnetic levitation posture control apparatus of FIG. It is a side view which shows the magnetic levitation posture control apparatus of FIG. 3 shows the magnetic levitation posture control device of FIG. 3, in which FIG. 3A is a diagram showing a state where the levitation rotor is viewed from directly below, and FIG. 3B is a state where the levitation rotor is viewed from directly above. FIG. In the magnetic levitation posture control device of FIG. 3, the position control in the radial direction by the Lorentz force generated toward the rotation center axis of the levitation rotor will be described. FIG. It is a figure which shows a state, The figure (b) is a figure which shows the state which looked at the floating rotor from right above. 3A and 3B are diagrams for explaining another example of changing the winding method of the secondary coil of the levitation rotor in the magnetic levitation posture control apparatus of FIG. It is a figure which shows the state seen from right below. It is a figure for demonstrating the measuring system of the induced current of the secondary coil of a levitation rotor in the magnetic levitation posture control apparatus of FIG. 8A and 8B illustrate a floating rotor used in the measurement system of FIG. 8, in which FIG. 8A is a diagram illustrating a state where the floating rotor is viewed from directly above, and FIG. 8B is a diagram in which a secondary coil is wound. It is a figure which shows the state which looked at the floating rotor which is not rotating from right above. FIG. 9A is a diagram showing measurement results in the measurement system of FIG. 8, and FIG. 9A is a diagram showing measurement results when the gap between the floating rotor and the electromagnetic induction stator is 1.5 mm. (B) is a figure which shows the measurement result in case the clearance gap between a floating rotor and an electromagnetic induction stator is 2.0 mm, and the figure (c) shows the clearance gap between a floating rotor and an electromagnetic induction stator. It is a figure which shows the measurement result in the case of setting to 5 mm. FIG. 3 shows an example of a second embodiment in which the winding method of the secondary coil of the levitation rotor is changed in the magnetic levitation posture control apparatus of FIG. 3, and FIGS. It is a figure which shows the state seen from right below. It is a perspective view which shows an example of 3rd Embodiment at the time of changing the structure of the magnetic levitation posture control apparatus of FIG. It is a side view which shows the magnetic levitation posture control apparatus of FIG. The position control in the axial direction by the Lorentz force generated toward the direction along the rotation center axis of the levitation rotor in the magnetic levitation posture control device of FIG. 12 will be described, and FIGS. Both are side views showing the magnetic levitation posture control device, and FIGS. 7C and 7D are schematic views showing modifications of the winding method of the secondary coil in FIGS. It is a perspective view which shows an example of 4th Embodiment at the time of changing the structure of the magnetic levitation posture control apparatus of FIG. 15 shows the magnetic levitation posture control device of FIG. 15, wherein FIG. 15A is a perspective view showing the magnetic levitation posture control device of FIG. 15, and FIG. 15B is the magnetic levitation posture control device of FIG. It is a figure which shows the state which looked at from right below. It is a figure for demonstrating the measuring system of the induced current of the secondary coil of a levitating rotor in the magnetic levitation attitude | position control apparatus of FIG. It is a figure which shows the measurement result in the measurement system of FIG. 17, Comprising: The figure (a) is a figure which shows the measurement result at the time of changing the distance of an axial center, The figure (b) shows radial direction gap. It is a figure which shows the measurement result at the time of changing. FIG. 17 shows an example of the fifth embodiment when the configuration of the magnetic levitation posture control device of FIG. 15 is changed, and FIG. 15A is a perspective view showing the magnetic levitation posture control device, and FIG. ) Is a side view showing the magnetic levitation posture control device. It is a side view which also shows an example of 6th Embodiment at the time of changing the structure of the magnetic levitation posture control apparatus of FIG.

(Principle of the magnetic levitation posture control device of the present invention)
First, the outline of the principle of the magnetic levitation posture control device of the present invention will be described with reference to FIG. FIG. 6A shows a case where Lorentz force is generated in the radial direction of the floating rotor by the electromagnetic induction method, and shows a state where the permanent magnet 220 is arranged so as to face the surface of the floating rotor 300. Yes. Reference numeral 313 denotes a secondary coil wound around the floating rotor 300. As will be described in detail later, when an induced current I flows through the secondary coil 313 having the conductive wire portions 313a to 313d, a Lorentz force F is generated in the radial direction of the floating rotor 300 by the magnetic field of the permanent magnet 220 facing the conductive wire portion 313b. To do. FIG. 5A shows the case where the Lorentz force F is generated toward the rotation center axis O, but the direction opposite to the rotation center axis O is obtained by changing the direction of the magnetic pole of the permanent magnet 220. A Lorentz force F is generated toward. Further, when the permanent magnet 220 is disposed on the side surface of the levitation rotor 300 as shown in FIG. 5B described later, a Lorentz force F is generated in the axial direction of the levitation rotor 300.

  Next, FIG. 5B shows a case where the Lorentz force F is generated along the rotation center axis of the floating rotor by the electromagnetic induction method, and the permanent magnet 220 is opposed to the side surface of the floating rotor 300. It shows the state of being placed in. Moreover, the state which wound the secondary coil 313 to the side surface of the floating rotor 300 is shown. In this case, when the induced current I flows through the secondary coil 313 having the conductive wire portions 313a to 313d, the Lorentz force F is generated along the rotation center axis of the floating rotor 300 by the magnetic field of the permanent magnet 220 facing the conductive wire portion 313b. To do. FIG. 2B shows a case where the Lorentz force F is generated upward along the rotation center axis of the floating rotor 300, but the floating rotor 300 is changed by changing the direction of the magnetic pole of the permanent magnet 220. A Lorentz force F is generated downward along the rotation center axis. Further, when the permanent magnet 220 is disposed on the upper side of the secondary coil 313, Lorentz force is generated in the radial direction of the floating rotor 300.

  Next, FIG. 7C shows a case where Lorentz force is generated in the radial direction of the floating rotor by the energy transmission method, and the state where the permanent magnet 220 is arranged so as to face the surface of the floating rotor 300. Is shown. Moreover, the state which wound the secondary coil 313 to the side surface of the floating rotor 300 is shown. In this case, when the induction current I flows through the secondary coil 313, a Lorentz force F is generated in the radial direction of the floating rotor 300 by the magnetic field of the permanent magnet 220 facing the secondary coil 313. FIG. 2C shows the case where the Lorentz force F is generated toward the rotation center axis O, but the direction opposite to the rotation center axis O is obtained by changing the direction of the magnetic pole of the permanent magnet 220. A Lorentz force F is generated toward.

  Next, FIG. 4D shows a case where the Lorentz force F is generated along the rotation center axis of the floating rotor by the energy transmission method, and the permanent magnet 220 is opposed to the side surface of the floating rotor 300. It shows the state of being placed in. In this case, when the induced current I flows through the secondary coil 313, a Lorentz force F is generated along the rotation center axis of the levitation rotor 300 by the magnetic field of the permanent magnet 220 facing the secondary coil 313. FIG. 4D shows a case where the Lorentz force F is generated upward along the rotation center axis of the floating rotor 300, but the floating rotor 300 is changed by changing the direction of the magnetic poles of the permanent magnet 220. A Lorentz force F is generated downward along the rotation center axis.

  Moreover, it is also possible to replace the permanent magnet 220 shown in FIGS. In this case, by changing the direction of the magnetic pole of the electromagnet, the direction of the Lorentz force F can be changed in accordance with the direction of the magnetic pole of the electromagnet.

(First embodiment: electromagnetic induction system)
Hereinafter, a first embodiment of a magnetic levitation posture control apparatus according to the present invention will be described with reference to FIGS. In addition, the rotation center axis | shaft demonstrated below is a straight line used as the center of rotational motion. The rotation center axis of the floating rotor is a center line that is the center of the rotational movement of the floating rotor. The levitation rotor performs a rotational motion around this center line.

  First, the outline of the first embodiment of the magnetic levitation posture control apparatus of the present invention will be described with reference to FIG. FIG. 2 shows an example of application of the magnetic levitation posture control apparatus of the present invention. The magnetic levitation posture control apparatus 100 shown in the figure can constitute a part of a magnetic levitation apparatus 700 that is a magnetic levitation system. Incidentally, the magnetic levitation device 700 is assumed to be applied to a centrifugal pump motor for an artificial heart in the medical field, for example. In addition, although the magnetic levitation apparatus 700 is accommodated in a casing (not shown), the casing is not shown for convenience of explanation. However, the magnetic levitation posture control apparatus 100 shown as an example of application to the magnetic levitation apparatus 700 is not limited to this, and can be applied to various drive motors for pumps. .

  The magnetic levitation posture control device 100 includes an electromagnetic induction stator 200 and a levitation rotor 300. Reference numeral 400 denotes an impeller, reference numeral 500 denotes a rotor that rotates the impeller, and reference numeral 600 denotes a rotation control stator.

  Incidentally, the electromagnetic induction stator 200, the floating rotor 300, the impeller 400, the rotor 500, and the rotation control stator 600 are arranged along the rotation center axis of the floating rotor 300. The electromagnetic induction stator 200 and the rotation control stator 600 can be made of a magnetic material or a non-magnetic material. Further, the floating rotor 300 and the rotor 500 can be made of a magnetic material or a non-magnetic material.

  The electromagnetic induction stator 200 has salient poles 210 and permanent magnets 220 that constitute an electromagnet described later, and controls the attitude of the floating rotor 300. Here, the electromagnet is for generating an induced current, and the permanent magnet 220 is used for generating a Lorentz force, details of which will be described later. The rotation control stator 600 includes an electromagnet (not shown), and rotates the rotor 500 by changing the polarity of the electromagnet. In addition, since the structure of rotation control stator 600 can use a well-known structure, the description is abbreviate | omitted here.

  The levitation rotor 300 and the rotor 500 are supported by receiving the magnetic force between the electromagnetic induction stator 200 and the rotation control stator 600. That is, the floating rotor 300 and the rotor 500 do not use a mechanical bearing mechanism. Therefore, for example, when used for a pump for an artificial heart, there is an effect that the volume of the entire pump can be reduced as compared with other systems. Mechanical bearings have problems related to lubrication and frictional heat. By using a magnetic bearing as in this embodiment, various problems caused by mechanical bearings can be solved.

  The levitation rotor 300 is provided with a secondary coil 313, which will be described later. The position of the levitation rotor 300 in the radial direction is controlled by a Lorentz force F generated in a direction orthogonal to the rotation center axis, details of which will be described later. The position of the levitation rotor 300 in the direction of the rotation center axis is also controlled by the Lorentz force F generated along the rotation center axis, which will be described in detail later.

  Next, the details of the electromagnetic induction stator 200 and the floating rotor 300 constituting the magnetic levitation posture control device 100 will be described with reference to FIGS. In the following description, the position of the floating rotor 300 in the radial direction is mainly controlled by the Lorentz force F generated toward the rotation center axis of the floating rotor 300.

  FIG. 3 shows only the magnetic levitation posture control device 100 of FIG. FIG. 4 shows a state where the magnetic levitation posture control device 100 of FIG. 3 is viewed from the side. FIGS. 5A, 6 and 7 show the magnetic levitation posture control apparatus 100 shown in FIG. 3 as viewed from directly below. FIG. 5B shows a state where the floating rotor 300 shown in FIG. 3 is viewed from directly above.

  First, as shown in FIGS. 3, 4, and 5 (a), for example, four salient poles 210 are arranged in the electromagnetic induction stator 200 at a predetermined interval along the circumferential direction. In addition, although mentioned later for details, when the below-mentioned secondary coil 313 is wound by the gear shape, it is preferable that the four salient poles 210 are arrange | positioned at equal intervals along the circumferential direction.

  A primary coil 211 is wound around these salient poles 210. The salient pole 210 and the primary coil 211 constitute an electromagnet. Here, although the case where the electromagnet by the salient pole 210 and the primary coil 211 is used is not limited to this, a permanent magnet may be used. The electromagnetic induction stator 200 has four permanent magnets 220 arranged at predetermined intervals along the circumferential direction. Similarly to the above, when the secondary coil 313 is wound in a gear shape, it is preferable that the four permanent magnets 220 are arranged at equal intervals along the circumferential direction. In addition, here, the term “gear shape” is used for the winding method of the secondary coil 313, but the term “gear shape” is also used for the method of winding the rotor blade shown in FIG. To do.

  The permanent magnet 220 is located on the outer periphery from the salient pole 210. This corresponds to the winding method of the secondary coil 313 on the floating rotor 300 side described later, and details thereof will be described later.

  Here, the number of salient poles 210 and permanent magnets 220 constituting the electromagnet is four, but the number is not limited to four. Depending on how to wind a secondary coil 313 on the floating rotor 300 described later, it is possible to use two or five or more coils. The salient pole 210 and the permanent magnet 220 may be one. In this case, the Lorentz force F generated toward the rotation center axis of the levitation rotor 300 is only in one direction. However, in accordance with the rotation of the levitation rotor 300, the wire portions 313 b of the respective tooth portions 313 A of the secondary coil 313 described later In turn, a Lorentz force F toward the rotation center axis is generated. Thereby, since the balance in the radial direction of the floating rotor 300 is maintained, the position of the floating rotor 300 in the radial direction can be controlled. This means that the higher the rotational speed of the floating rotor 300, the better the balance in the radial direction of the floating rotor 300 is maintained.

  Next, as shown in FIG. 5B, a gear-shaped groove 312 is formed on the surface side of the levitation rotor 300 that faces the electromagnetic induction stator 200. A secondary coil 313 is disposed in the groove 312. Note that providing the groove 312 facilitates positioning of the secondary coil 313. Further, by providing the groove 312, the protrusion of the secondary coil 313 from the surface facing the electromagnetic induction stator 200 of the floating rotor 300 is eliminated. Further, since the protrusion of the secondary coil 313 is eliminated by providing the groove 312, the thickness of the floating rotor 300 including the secondary coil 313 does not increase.

  The provision of the groove 312 is not directly related to the control of the position of the floating rotor 300 in the radial direction. Therefore, the groove 312 may be omitted. However, it is preferable to provide the groove 312 because the above-described various effects can be obtained by providing the groove 312.

  Here, the secondary coil 313 is wound around the gear-shaped groove 312 and thus has four tooth portions 313A. Further, each tooth portion 313A includes a conducting wire portion 313a extending radially from the rotation center axis O of the levitation rotor 300, a conducting wire portion 313b extending in the circumferential direction of the levitation rotor 300, and a rotation center axis from the outer peripheral side of the levitation rotor 300. A conductor portion 313c extending in the direction of O. Note that reference numeral 313d denotes a conductor portion that continues to each tooth portion 313A.

  Then, the conductive wire portions 313a and 313c of the secondary coil 313 pass over the salient poles 210 on the electromagnetic induction stator 200 side when the floating rotor 300 rotates. Further, when the levitation rotor 300 rotates, the conducting wire portion 313b of the secondary coil 313 passes over the permanent magnet 220 on the electromagnetic induction stator 200 side. Thus, the positional relationship between the salient poles 210 and the permanent magnets 220 on the electromagnetic induction stator 200 side and the conducting wire portions 313a and 313c and the conducting wire portion 313b on the floating rotor 300 side is determined.

  In the winding method of the secondary coil 313, for example, as shown in FIGS. 4, 5 (a) and 5 (b), the conducting wire portions 313 c and 313 d are drawn out to the opposite surface side of the floating rotor 300. Here, the opposite surface side of the floating rotor 300 is a surface side that does not face the electromagnetic induction stator 200. Thereby, even if the conducting wire portion 313c of the secondary coil 313 passes over the salient pole 210 on the electromagnetic induction stator 200 side, the influence of the magnetic field from the salient pole 210 on the conducting wire portion 313c becomes extremely small. That is, as is well known, the magnetic field from the salient pole 210 is inversely proportional to the square of the distance. Therefore, for example, by pulling out only the conductor portion 313c to the opposite surface side of the floating rotor 300, The influence of the magnetic field can be made extremely small. In this case, the levitation rotor 300 may be a nonmagnetic material. However, if the levitation rotor 300 is made of a magnetic material, the influence of the magnetic field from the salient pole 210 on the conducting wire portion 313c can be further reduced.

  Here, when the conducting wire portions 313a and 313c of the secondary coil 313 pass through the magnetic field from the salient pole 210 on the electromagnetic induction stator 200 side, the conducting wire portion 313a is affected by the magnetic field, but the conducting wire portion 313c is affected by the magnetic field. Becomes extremely small. In this way, the influence of the magnetic field by the salient pole 210 on the conducting wire portion 313c of the secondary coil 313 is extremely reduced, so that the Lorentz force F in the direction opposite to the direction toward the rotation center axis O is applied as described later. It will not occur. That is, a Lorentz force F in only one direction is generated.

  Here, the conductive wire portions 313c and 313d are drawn to the opposite surface side of the floating rotor 300, but the conductive wire portions 313a and 313d can be drawn to the opposite surface side of the floating rotor 300. . In this case, the Lorentz force F toward the rotation center axis O can be generated by changing the direction of the magnetic pole on the tip side of the salient pole 210 on the electromagnetic induction stator 200 side and the magnetic pole of the permanent magnet 220.

  Further, the winding method of the secondary coil 313 is not limited to the shape in which the four tooth portions 313A are formed as illustrated. In the present embodiment, the position in the radial direction may be controlled by the Lorentz force F generated toward the rotation center axis O of the levitation rotor 300. Therefore, the secondary coil 313 may have a winding method in which two or five or more tooth portions 313A are formed. In this case, the salient pole 210 and the permanent magnet 220 on the electromagnetic induction stator 200 side may be provided in accordance with the winding method of the secondary coil 313.

  Moreover, it is good also as one tooth | gear part 313A. In this case, the Lorentz force F generated toward the rotation center axis of the levitation rotor 300 is only in one direction, but as described above, the conductor portion of the tooth portion 313A of the secondary coil 313 in accordance with the rotation of the levitation rotor 300. A Lorentz force F toward the rotation center axis is generated at 313b. Thereby, since the balance in the radial direction of the floating rotor 300 is maintained, the position of the floating rotor 300 in the radial direction can be controlled. As described above, the higher the rotational speed of the floating rotor 300, the better the balance in the radial direction of the floating rotor 300 is maintained.

  Next, position control in the radial direction by the Lorentz force F generated toward the rotation center axis O of the floating rotor 300 will be described with reference to FIG.

  First, as shown in FIG. 6A, it is assumed that the floating rotor 300 rotates in the direction of arrow a. At this time, the conducting wire portion 313a of the secondary coil 313 passes over the salient pole 210 on the electromagnetic induction stator 200 side. During this passage, the conducting wire portion 313 a of the secondary coil 313 moves in a direction orthogonal to the direction of the magnetic field from the salient pole 210. Here, it is assumed that the magnetic pole on the tip side of the salient pole 210 on the electromagnetic induction stator 200 side is an N pole. In this case, the induced current I flows through the secondary coil 313 in the direction of the arrow.

  At this time, the conducting wire portion 313b of the secondary coil 313 passes over the permanent magnet 220 on the electromagnetic induction stator 200 side. Here, due to the magnetic field generated by the permanent magnet 220 and the induced current I flowing through the conductive wire portion 313 b of the secondary coil 313, a Lorentz force F toward the rotation center axis O is generated in the floating rotor 300.

  Here, since the Lorentz force F is generated at the four conductor portions 313 b of the secondary coil 313, the Lorentz force F from the four directions toward the rotation center axis O is generated in the floating rotor 300. Thereby, the radial position control of the floating rotor 300 is possible.

Here, the Lorentz force F generated in the conducting wire portion 313b of the secondary coil 313 by the magnetic field of the permanent magnet 220 on the electromagnetic induction stator 200 side is:
F = I _total LB _PM N (Formula 1)
It is represented by
Here, I is an induced current generated in the conducting wire part 313a of the secondary coil 313. L [m] is the length of the conducting wire portion 313b passing through the permanent magnet 220 on the electromagnetic induction stator 200 side (= the length of the permanent magnet 220). B _PM is the magnetic flux density of the permanent magnet 220 when the grade is, for example, (N-48H). N is the number of turns of the secondary coil 313.

  Further, as shown in FIG. 6B, when the conducting wire portion 313 a of the secondary coil 313 passes over the salient pole 210 on the electromagnetic induction stator 200 side, the conducting wire portion 313 c of the secondary coil 313 subsequently continues to the electromagnetic induction stator 200. It passes over the salient pole 210 on the side. At this time, the conductive wire portion 313c of the secondary coil 313 is drawn to the opposite surface side of the floating rotor 300 as described above. That is, it is drawn to the surface side that does not face the electromagnetic induction stator 200. Thereby, even if the conducting wire portion 313c of the secondary coil 313 passes over the salient pole 210 on the electromagnetic induction stator 200 side, the influence of the magnetic field from the salient pole 210 on the conducting wire portion 313c becomes extremely small. In addition, since the conducting wire portion 313c is not affected by the magnetic field from the salient pole 210, the reverse induced current I indicated by the dotted line does not flow through the secondary coil 313. Thereby, the Lorentz force F opposite to the direction toward the rotation center axis O is not generated.

  For example, as shown in FIG. 7, all the conducting wire portions 313 a to 313 c may be arranged on the surface side of the levitation rotor 300 facing the electromagnetic induction stator 200 in the winding method of the secondary coil 313. In this case, it is assumed that the floating rotor 300 rotates in the direction of arrow a as shown in FIG. At this time, when the conducting wire portion 313a of the secondary coil 313 passes over the salient pole 210 on the electromagnetic induction stator 200 side, the induced current I flows through the secondary coil 313 in the direction of the arrow as described above.

  At this time, similarly to the above, the Lorentz force F toward the rotation center axis O is generated in the floating rotor 300 by the magnetic field generated by the permanent magnet 220 and the induced current I flowing through the conducting wire portion 313b of the secondary coil 313.

  Further, after the conducting wire portion 313a of the secondary coil 313 passes over the salient pole 210 on the electromagnetic induction stator 200 side, as shown in FIG. 7B, the conducting wire portion 313c of the secondary coil 313 is on the electromagnetic induction stator 200 side. Passes over the salient pole 210. At this time, when the conducting wire portion 313c of the secondary coil 313 moves in a direction orthogonal to the direction of the magnetic field from the salient pole 210, a reverse induced current I indicated by a dotted line flows in the secondary coil 313.

  In this case, the conducting wire portion 313b of the secondary coil 313 is at a position off the permanent magnet 220 on the electromagnetic induction stator 200 side. That is, since the conducting wire portion 313b of the secondary coil 313 is in a position that does not face the permanent magnet 220 on the electromagnetic induction stator 200 side, the Lorentz force F is not generated in the floating rotor 300 from the rotation center axis O to the outside. In other words, the Lorentz force F in the direction opposite to the direction toward the rotation center axis O is not generated. Thus, only the Lorentz force F from the four directions toward the rotation center axis O is generated in the floating rotor 300 while the floating rotor 300 is rotating.

  In addition, as shown in FIG.7 (b), when all the conducting wire parts 313a-313c are arrange | positioned in the surface side facing the electromagnetic induction stator 200 of the floating rotor 300, you may provide a rectifier circuit in the floating rotor 300. FIG. . In this case, the induced current I generated only in the conductive wire portion 313a can be made to flow in the secondary coil 313.

  In addition, the direction of the magnetic pole of the permanent magnet 220 on the electromagnetic induction stator 200 side described with reference to FIGS. 3 to 7 may be opposite to the above-described direction. In this case, the Lorentz force F in the direction opposite to the direction from the four directions toward the rotation center axis O can be generated in the floating rotor 300. Further, the permanent magnet 220 may be an electromagnet. In this case, the direction of the Lorentz force F generated in the floating rotor 300 can be changed by changing the polarity of the electromagnet.

  Further, the permanent magnet 220 on the electromagnetic induction stator 200 side may be disposed on the side surface side of the floating rotor 300. In this case, as in the principle described with reference to FIG. 1B, an upward or downward Lorentz force F can be generated along the rotation center axis of the floating rotor 300. In this case, similarly to the above, the permanent magnet 220 disposed on the side surface of the floating rotor 300 may be an electromagnet.

  Next, with reference to FIG. 8 to FIG. 10, a description will be given of measurement results of experiments on the induced current I generated in the secondary coil 313. In the following measurement, a floating rotor 300A as shown in FIG. 9 was used in place of the above-described floating rotor 300. The configuration of the floating rotor 300A will be described later.

  First, the measurement system of the induced current I will be described with reference to FIG. The electromagnetic induction stator 200 is fixed to a pedestal (not shown). Levitation rotor 300A is connected to a rotation shaft to which the rotational force of a motor (not shown) is transmitted. Further, an induced current I generated by a secondary coil 313 (described later) wound around the floating rotor 300A was taken out by a brush and a rectifying mechanism provided on a rotating shaft (not shown) and measured by an ammeter 800.

  As shown in FIGS. 9A and 9B, the floating rotor 300A used in the experiment is provided with a nonmagnetic material 314 having an engagement hole 314a at the center. A magnetic body 315 is disposed around the nonmagnetic body 314.

  The secondary coil 313 is wound from the engagement hole 314a of the nonmagnetic material 314 at the center to the outer peripheral edge of the magnetic material 315. That is, the secondary coil 313 is wound so as to extend radially from the rotation center axis O of the floating rotor 300A. In other words, the winding method corresponding to the conducting wire portion 313a of the secondary coil 313 extending radially from the rotation center axis O of the floating rotor 300 described above is embodied. Moreover, the winding location of the secondary coil 313 is four locations, for example. Further, the number of turns of each secondary coil 313 is five. Further, the secondary coil 313 and the magnetic body 315 are insulated by an insulating tape 318. As a result, energization between the secondary coil 313 and the magnetic body 315 is avoided.

  Note that the induction current I was changed in increments of 500 rpm, with the number of rotations of a motor (not shown) from 1000 rpm to 2500 rpm. Further, the gap between the floating rotor 300A and the electromagnetic induction stator 200 was 1.5 mm to 2.5 mm, and was changed in 0.5 mm increments. Further, the excitation current applied to the motor (not shown) was set to 0 A to 2.5 A, and was changed in increments of 0.5 A.

  Next, the measurement result of the induced current I will be described with reference to FIG. First, FIG. 10A shows the measurement result when the gap between the floating rotor 300A and the electromagnetic induction stator 200 is 1.5 mm. As can be seen from FIG. 10A, the value of the induction current I increases as the excitation current and the rotational speed of the motor (not shown) are increased. Further, as shown in FIG. 10B, even when the gap between the floating rotor 300A and the electromagnetic induction stator 200 is 2.0 mm, the induced current I increases as the excitation current and the rotational speed of the motor (not shown) are increased. It can be seen that the value of is higher.

  Further, as shown in FIG. 10C, even when the gap between the floating rotor 300A and the electromagnetic induction stator 200 is 2.5 mm, the induced current I increases as the excitation current and the rotational speed of the motor (not shown) are increased. It can be seen that the value of is higher. However, as can be seen by comparing FIGS. 10A to 10C, it can be seen that the value of the induced current I is higher when the gap between the floating rotor 300A and the electromagnetic induction stator 200 is reduced. .

  Moreover, 29.9 mA was able to be obtained about the induction | guidance | derivation electric current I in the assumption use conditions which are 2.0 mm of clearances, the rotation speed of 2000 rpm, and exciting current 0A. In addition, an induction current I having a maximum value of 119.7 mA could be obtained at a gap of 1.5 mm where the magnetic flux density was the largest, a rotation speed of 2500 rpm, and an excitation current of 2.0 A.

  From the above measurement results, when the secondary coil 313 is wound so as to extend radially from the rotation center axis O of the floating rotor 300A, for example, an induced current I having a maximum value of 119.7 mA can be obtained. Therefore, the Lorentz force F generated toward the rotation center axis O can be obtained by the above-described formula 1, and the position of the floating rotor 300 in the radial direction can be controlled.

  Thus, in the first embodiment, the secondary coil 313 is wound on the surface of the levitation rotor 300 that faces the electromagnetic induction stator 200. Further, the secondary coil 313 has a conductive wire portion 313 a (first conductive wire portion) extending from the rotation center axis side of the floating rotor 300 toward the outer peripheral side, and a conductive wire portion 313 b (second conductive wire portion) of the floating rotor 300. The wire portion 313c (third wire portion) was wound so as to extend in the circumferential direction so as to extend from the outer peripheral side of the floating rotor 300 toward the rotation center axis side. In addition, the electromagnet (the salient pole 210 and the primary coil 211: first magnet) on the electromagnetic induction stator 200 side is disposed at a position where the conducting wire portions 313a and 313c pass, and the permanent magnet 220 (second magnet) is disposed. The conductor portion 313b is disposed at a position where it passes.

  In this configuration, due to the rotation of the floating rotor 300, an induced current I is applied to the secondary coil 313 on the floating rotor 300 side by the magnetic field of the electromagnet (the salient pole 210 and the primary coil 211: first magnet) on the electromagnetic induction stator 200 side. Flowing. Further, a Lorentz force F directed in the radial direction is generated in the floating rotor 300 by the magnetic field generated by the permanent magnet 220 on the electromagnetic induction stator 200 side and the induced current I flowing through the secondary coil 313. Since the secondary coil 313 that generates the Lorentz force F can control the attitude of the floating rotor 300 in the radial direction, the attitude control of the floating rotor 300 can be performed with a simple configuration.

  In the first embodiment, the secondary coil 313 is wound in a gear shape. In this configuration, the secondary coil 313 is wound in a gear shape, so that the conducting wire portions 313a to 313c of the secondary coil 313 can be arranged in a well-balanced manner on the floating rotor 300. Further, by winding the secondary coil 313 in a gear shape, the number of the respective tooth portions 313A can be arbitrarily determined, and the location where the Lorentz force F is generated can be arbitrarily set.

(Second embodiment: electromagnetic induction system)
Next, a second embodiment in which the winding method of the secondary coil 313 of the levitation rotor 300 of the magnetic levitation posture control device 100 described above is changed will be described with reference to FIG. Note that, in the drawings described below, the same reference numerals are given to portions common to FIGS. 2 to 7, and overlapping descriptions will be given as appropriate. 11A and 11B show a state where the magnetic levitation posture control device 100 shown in FIG. 3 is viewed from directly below.

  First, as shown in FIG. 11A, the secondary coil 313 is wound around the floating rotor 300 so as to have a plurality of rectangular tooth portions 313B. In other words, the winding method of the secondary coil 313 shown in FIG. 11A is a modification of the secondary coil 313 described with reference to FIG. In FIG. 11A, the groove 312 around which the secondary coil 313 described in FIG. 5B is wound is not shown, but it is needless to say that it may be provided in the same manner. Further, the number of teeth 313B of the secondary coil 313 and the number of salient poles 210 and permanent magnets 220 on the electromagnetic induction stator 200 side may be one or more for the same reason as described above.

  Similarly, each tooth portion 313B includes a conducting wire portion 313a extending radially from the rotation center axis O of the floating rotor 300, a conducting wire portion 313b extending in the circumferential direction of the floating rotor 300, and an outer peripheral side of the floating rotor 300. Lead wire part 313c extending in the direction of the rotation center axis O. Note that reference numeral 313d denotes a conductor portion that continues to each tooth portion 313B. Moreover, the conducting wire portions 313c and 313d are drawn out to the surface side not facing the electromagnetic induction stator 200 in the same manner as described above.

  In addition, although it is set as the case where the tooth part 313B of the secondary coil 313 is made into the rectangular shape here, it is not restricted to a rectangular shape. For example, a trapezoidal shape or an inverted triangular shape may be used. In short, it may be wound so as to form a conductor portion 313a that traverses the magnetic field from the salient pole 210 on the electromagnetic induction stator 200 side and a conductor portion 313b that traverses the magnetic field of the permanent magnet 220.

  In such a configuration, when the floating rotor 300 rotates in the direction of arrow a, for example, the conducting wire portion 313a of the secondary coil 313 passes over the salient pole 210 on the electromagnetic induction stator 200 side. During this passage, the conducting wire portion 313 a of the secondary coil 313 moves in a direction orthogonal to the direction of the magnetic field from the salient pole 210. As a result, the induced current I flows through the secondary coil 313 in the direction of the arrow.

  At this time, the conducting wire portion 313b of the secondary coil 313 passes over the permanent magnet 220 on the electromagnetic induction stator 200 side. Here, due to the magnetic field generated by the permanent magnet 220 and the induced current I flowing through the conductive wire portion 313 b of the secondary coil 313, a Lorentz force F toward the rotation center axis O is generated in the floating rotor 300. Similarly to the above, the Lorentz force F is generated at the four conductive wire portions 313b of the secondary coil 313. Therefore, the Lorentz force F is generated in the floating rotor 300 from the four directions toward the rotation center axis O. Thereby, position control of the floating rotor 300 in the radial direction is possible.

Here, the Lorentz force F generated in the conductive wire portion 313b of the tooth portion 313B of the secondary coil 313 by the magnetic field of the permanent magnet 220 on the electromagnetic induction stator 200 side is the same as in the above formula 1.
F = I _total LB _PM N
It is represented by

  In the method of winding the secondary coil 313 on the levitation rotor 300 side, as shown in FIG. 11B, all the conductor portions 313a to 313d are placed only on the surface side facing the electromagnetic induction stator 200 of the levitation rotor 300. You may arrange.

  In addition, as shown in FIG.11 (b), when all the conducting wire parts 313a-313d are arrange | positioned in the surface side facing the electromagnetic induction stator 200 of the floating rotor 300, you may provide a rectifier circuit in the floating rotor 300. FIG. . In this case, the induced current I generated only in the conductive wire portion 313a can be made to flow in the secondary coil 313.

  When the levitation rotor 300 rotates, for example, in the direction of the arrow a, the conductive wire portion 313a of the secondary coil 313 passes over the salient pole 210 on the electromagnetic induction stator 200 side as described above. At this time, similarly to FIG. 11A, the induced current I flows through the secondary coil 313 in the direction of the arrow. At this time, similarly to the above, the Lorentz force F toward the rotation center axis O is generated in the floating rotor 300 by the magnetic field generated by the permanent magnet 220 and the induced current I flowing through the conducting wire portion 313b of the secondary coil 313.

  Further, after the conducting wire portion 313a of the secondary coil 313 passes over the salient pole 210 on the electromagnetic induction stator 200 side, the conducting wire portion 313c of the secondary coil 313 passes over the salient pole 210 on the electromagnetic induction stator 200 side. At this time, the conducting wire portion 313 c of the secondary coil 313 moves in a direction orthogonal to the direction of the magnetic field from the salient pole 210. As a result, a reverse induced current I indicated by a dotted arrow flows through the secondary coil 313.

  In this case, the conducting wire portion 313b of the secondary coil 313 is at a position off the permanent magnet 220 on the electromagnetic induction stator 200 side. That is, similarly to the above, since the conducting wire portion 313b of the secondary coil 313 is in a position not facing the permanent magnet 220 on the electromagnetic induction stator 200 side, the floating rotor 300 has a Lorentz force F directed outward from the rotation center axis O. Does not occur. Thus, only the Lorentz force F from the four directions toward the rotation center axis O is generated in the floating rotor 300 while the floating rotor 300 is rotating.

  Note that the direction of the magnetic pole of the permanent magnet 220 on the electromagnetic induction stator 200 side described in FIG. 11 may be opposite to the above-described direction. In this case, the Lorentz force F in the direction opposite to the direction from the four directions toward the rotation center axis O can be generated in the floating rotor 300. Further, the permanent magnet 220 may be an electromagnet. In this case, the direction of the Lorentz force F generated in the floating rotor 300 can be changed by changing the polarity of the electromagnet.

Further, the permanent magnet 220 on the electromagnetic induction stator 200 side may be disposed on the side surface side of the floating rotor 300. In this case, as in the principle described with reference to FIG. 1B, an upward or downward Lorentz force F can be generated along the rotation center axis of the floating rotor 300.
In this case, similarly to the above, the permanent magnet 220 disposed on the side surface of the floating rotor 300 may be an electromagnet.

  As described above, in the second embodiment, although the winding method of the secondary coil 313 in the first embodiment is somewhat different, the surface of the levitation rotor 300 that faces the electromagnetic induction stator 200 is the same as in the first embodiment. A secondary coil 313 was wound on the top. Further, the secondary coil 313 has a conductive wire portion 313 a (first conductive wire portion) extending from the rotation center axis side of the floating rotor 300 toward the outer peripheral side, and a conductive wire portion 313 b (second conductive wire portion) of the floating rotor 300. The wire portion 313c (third wire portion) was wound so as to extend in the circumferential direction so as to extend from the outer peripheral side of the floating rotor 300 toward the rotation center axis side. In addition, the electromagnet (the salient pole 210 and the primary coil 211: first magnet) on the electromagnetic induction stator 200 side is disposed at a position where the conducting wire portions 313a and 313c pass, and the permanent magnet 220 (second magnet) is disposed. The conductor portion 313b is disposed at a position where it passes.

  In this configuration, similarly to the first embodiment, by the rotation of the floating rotor 300, 2 on the floating rotor 300 side due to the magnetic field of the electromagnet (the salient pole 210 and the primary coil 211: the first magnet) on the electromagnetic induction stator 200 side. An induced current I flows through the secondary coil 313. Further, a Lorentz force F directed in the radial direction is generated in the floating rotor 300 by the magnetic field generated by the permanent magnet 220 on the electromagnetic induction stator 200 side and the induced current I flowing through the secondary coil 313. Since the secondary coil 313 that generates the Lorentz force F can control the attitude of the floating rotor 300 in the radial direction, the attitude control of the floating rotor 300 can be performed with a simple configuration.

  In the second embodiment, similarly to the first embodiment, by winding the secondary coil 313 in a gear shape, the conducting wire portions 313a to 313c of the secondary coil 313 are arranged in a well-balanced manner on the floating rotor 300. Can do. Further, by winding the secondary coil 313 in a gear shape, the number of the respective tooth portions 313B can be arbitrarily determined as described above, and the location where the Lorentz force F is generated can be arbitrarily set. .

(Third embodiment: electromagnetic induction system)
Next, a third embodiment in which the winding method of the secondary coil 313 of the levitation rotor 300 of the magnetic levitation posture control device 100 described above is changed will be described with reference to FIGS. In the drawings described below, the same reference numerals are given to portions common to FIGS. 2 to 7 and FIG.

  First, as shown in FIG. 12, the electromagnetic induction stator 200 is provided with a cylindrical portion 232 having a bottom portion 233. The inner diameter of the cylindrical portion 232 is matched with the outer diameter of the floating rotor 300. Permanent magnets 210 a and 220 are arranged on the inner surface 232 a of the cylindrical portion 232. The details of the location of the permanent magnets 210a and 220 will be described later, but there are, for example, 4 locations. In addition, the arrangement | positioning location of permanent magnet 210a, 220 is not limited to four places. Depending on how to wind a secondary coil 313 on the floating rotor 300 described later, it is possible to have two or five or more places. Similarly to the above, the permanent magnets 210a and 220 may be arranged in only one place.

  On the other hand, the secondary coil 313 is wound around the floating rotor 300 so as to have a plurality of tooth portions 313B along the outer peripheral direction of the outer peripheral surface. In other words, the winding method of the secondary coil 313 shown in FIG. 12 is a modification of the secondary coil 313 described with reference to FIG. In FIG. 12, the groove 312 around which the secondary coil 313 described in FIG. 5B is wound is not shown, but it is needless to say that it may be provided in the same manner. Further, the number of teeth 313B of the secondary coil 313 and the number of salient poles 210 and permanent magnets 220 on the electromagnetic induction stator 200 side may be one or more for the same reason as described above.

  The levitation rotor 300 rotates while being accommodated in the cylindrical portion 232 of the electromagnetic induction stator 200. In addition, although it is set as the case where the tooth part 313B of the secondary coil 313 is made into the rectangular shape here, it is not restricted to a rectangular shape. For example, a trapezoidal shape or an inverted triangular shape may be used. In short, it may be wound so as to form a conductor portion 313a that traverses the magnetic field from the salient pole 210 on the electromagnetic induction stator 200 side and a conductor portion 313b that traverses the magnetic field of the permanent magnet 220.

  Next, as shown to Fig.13 (a), the tooth | gear part 313B of the secondary coil 313 has the conducting wire part 313a extended toward the other surface side from the one surface side of the floating rotor 300 along the rotation center axis, and other surface A conductive wire portion 313b extending from the side toward the one surface side, and a conductive wire portion 313c extending along the outer circumferential direction of the floating rotor 300. In addition, the code | symbol 313d is a conducting wire part which continues to each tooth | gear part 313B.

  Here, the one surface side of the floating rotor 300 is a surface side that does not face the bottom portion 233 of the cylindrical portion 232 of the electromagnetic induction stator 200. Further, the other surface side of the floating rotor 300 is a surface side facing the bottom portion 233 of the cylindrical portion 232 of the electromagnetic induction stator 200. Note that the number of the tooth portions 313B of the secondary coil 313 is not particularly limited, and one or more teeth may be provided as described above.

  Further, for example, the conductive wire portion 313 c is embedded in the floating rotor 300. On the other hand, the conducting wire portion 313a, the conducting wire portion 313b, and the conducting wire portion 313d are drawn out and wound around the outer peripheral surface side of the floating rotor 300.

  On the other hand, the permanent magnets 210 a and 220 on the electromagnetic induction stator 200 side described above correspond to the winding position of the secondary coil 313. That is, the permanent magnet 210 a is provided at a position where the conducting wire portions 313 a and 313 c of the secondary coil 313 pass with the rotation of the floating rotor 300. The permanent magnet 220 is provided at a position where the conducting wire portion 313 b of the secondary coil 313 passes along with the rotation of the floating rotor 300.

  Moreover, when the permanent magnet 210a faces the conducting wire portion 313a of the secondary coil 313, the positional relationship between the permanent magnets 210a and 220 is determined so that the permanent magnet 220 faces the conducting wire portion 313b of the secondary coil 313. . In FIG. 13A, the permanent magnet 220 is disposed at a position facing the conductor portion 313 b of the secondary coil 313. Not only this but the permanent magnet 220 may be arrange | positioned in the position facing the conducting wire part 313d of the secondary coil 313. FIG.

  Due to the positional relationship between the permanent magnets 210 a and 220, when the permanent magnet 210 a faces the conductor portion 313 c of the secondary coil 313 as shown in FIG. 13B, the permanent magnet 220 leads the conductor of the secondary coil 313. It does not confront the part 313b. The permanent magnet 210a may be an electromagnet as described above.

  Next, generation of the Lorentz force F when the secondary coil 313 is wound around the levitation rotor 300 in a gear shape will be described. First, as shown in FIG. 13A, it is assumed that the floating rotor 300 rotates in the direction of arrow a. At this time, the conducting wire portion 313a of the secondary coil 313 passes by the permanent magnet 210a on the electromagnetic induction stator 200 side. At this time, the conducting wire portion 313a of the secondary coil 313 moves in a direction orthogonal to the direction of the magnetic field from the permanent magnet 210a. Here, it is assumed that the magnetic pole on the tip side of the permanent magnet 210a is an N pole. In this case, the induced current I flows through the secondary coil 313 in the direction of the arrow.

  At this time, the conducting wire portion 313b of the secondary coil 313 passes by the permanent magnet 220 on the electromagnetic induction stator 200 side. Here, due to the magnetic field generated by the permanent magnet 220 and the induced current I flowing through the conducting wire portion 313 b of the secondary coil 313, an upward Lorentz force F along the rotation center axis is generated in the floating rotor 300.

  Here, the Lorentz force F is generated at the conductive wire portion 313b of the tooth portion 313B of the secondary coil 313 facing the permanent magnets 220 provided at four locations. Therefore, an upward Lorentz force F along the rotation center axis is generated in the floating rotor 300 from the four tooth portions 313B. Thereby, axial position control is possible along the rotation center axis of the floating rotor 300.

Further, the Lorentz force F generated in the conductive wire portion 313b of the tooth portion 313B of the secondary coil 313 by the magnetic field of the permanent magnet 220 on the electromagnetic induction stator 200 side is the same as in the above formula 1.
F = I _total LB _PM N
It is represented by

  As shown in FIG. 13B, when the conducting wire portion 313c of the secondary coil 313 passes by the permanent magnet 210a on the electromagnetic induction stator 200 side, the conducting wire portion 313c crosses the magnetic field from the permanent magnet 210a. A reverse induced current I indicated by a dotted arrow flows through the secondary coil 313. In this case, the conducting wire portion 313b of the secondary coil 313 is at a position away from the permanent magnet 220 on the electromagnetic induction stator 200 side. That is, since the conducting wire portion 313b of the secondary coil 313 is in a position not facing the permanent magnet 220 on the electromagnetic induction stator 200 side, the Lorentz force F along the rotation center axis is not generated in the floating rotor 300.

  Note that in the secondary coil 313 on the floating rotor 300 side, for example, as shown in FIG. 14, all the conductive wire portions 313 a to 313 d may be wound around the outer peripheral surface side of the floating rotor 300. In this case, a rectifier circuit may be provided in the floating rotor 300 as described above. As a result, when the conducting wire portion 313a of the secondary coil 313 passes by the permanent magnet 210a on the electromagnetic induction stator 200 side, the induced current I flows through the secondary coil 313 only in the direction of the arrow as described above.

  At this time, similarly to the above, an upward Lorentz force F along the rotation center axis is generated in the floating rotor 300 by the magnetic field generated by the permanent magnet 220 and the induced current I flowing through the conductive wire portion 313b of the secondary coil 313.

  Further, as shown in FIG. 14B, when the conducting wire portion 313c of the secondary coil 313 passes by the permanent magnet 210a on the electromagnetic induction stator 200 side, the conducting wire portion 313c crosses the magnetic field from the permanent magnet 210a. A reverse induced current I indicated by a dotted arrow flows through the secondary coil 313. In this case, the conducting wire portion 313b of the secondary coil 313 is at a position away from the permanent magnet 220 on the electromagnetic induction stator 200 side. That is, since the conducting wire portion 313b of the secondary coil 313 is in a position not facing the permanent magnet 220 on the electromagnetic induction stator 200 side, the Lorentz force F along the rotation center axis is not generated in the floating rotor 300.

  In addition, although description overlaps, even if it provides about permanent magnet 210a, 220 by the side of the electromagnetic induction stator 200 shown in FIGS. 12-14 only in one place, control of the axial direction position of the floating rotor 300 is attained. Become. That is, the levitation rotor 300 rotates in the direction of arrow a. For this reason, the induction current I flows through the secondary coil 313 in accordance with the timing when the conductive wire portion 313a of each tooth portion 313B of the secondary coil 313 passes by the permanent magnet 210a on the electromagnetic induction stator 200 side. Further, the conductive wire portion 313b of each tooth portion 313B of the secondary coil 313 passes by the permanent magnet 220 on the electromagnetic induction stator 200 side in accordance with the timing when the induction current I flows through the secondary coil 313.

  That is, in accordance with the rotation of the floating rotor 300, an upward Lorentz force F along the rotation center axis is sequentially generated in the conductive wire portions 313a of the respective tooth portions 313B of the secondary coil 313. Thereby, since the balance in the axial direction of the floating rotor 300 is maintained, the position in the axial direction can be controlled. This means that the higher the rotational speed of the floating rotor 300, the better the balance at the axial position of the floating rotor 300 is maintained.

  Further, the direction of the magnetic pole of the permanent magnet 220 on the electromagnetic induction stator 200 side described with reference to FIGS. 12 to 14 may be opposite to the above-described direction. In this case, the floating rotor 300 can generate a downward Lorentz force F along the rotation center axis. Further, the permanent magnet 220 may be an electromagnet. In this case, the direction of the Lorentz force F generated in the floating rotor 300 can be changed by changing the polarity of the electromagnet.

  Further, the permanent magnet 220 on the electromagnetic induction stator 200 side may be disposed on the bottom portion 233 side of the cylindrical portion 232 so as to face the conducting wire portion 313b from above. In this case, the Lorentz force F can be generated in a direction (radial direction) perpendicular to the rotation center axis of the floating rotor 300 as in the principle described with reference to FIG. In this case, the permanent magnet 220 disposed on the bottom portion 233 side of the cylindrical portion 232 may be an electromagnet as described above.

  Thus, in 3rd Embodiment, the secondary coil 313 was arrange | positioned on the outer peripheral surface of the floating rotor 300. FIG. Further, the conducting wire portion 313a (first conducting wire portion) extends from one surface side to the other surface side of the floating rotor 300, and the conducting wire portion 313b (second conducting wire portion) extends along the outer circumferential direction of the floating rotor 300, The conducting wire portion 313c (third conducting wire portion) was wound so as to extend from the other surface side of the floating rotor 300 toward the one surface side. Further, the permanent magnet 210a (first magnet) is disposed at a position where the conducting wire portions 313a and 313c pass, and the permanent magnet 220 (second magnet) is passed through the conducting wire portion 313b (second conducting wire portion). It was arranged at the position.

  In this configuration, the conductor portions 313a and 313c on the floating rotor 300 side pass the magnetic field generated by the permanent magnet 210a (first magnet) on the electromagnetic induction stator 200 side. Further, the conducting wire portion 313b (second conducting wire portion) on the floating rotor 300 side passes through the magnetic field of the permanent magnet 220 (second magnet) on the electromagnetic induction stator 200 side. As a result, the Lorentz force F is generated in the floating rotor 300 as described above, and the attitude control of the floating rotor 300 can be performed with a simple configuration.

  In particular, in the third embodiment, since the secondary coil 313 is arranged on the outer peripheral surface of the levitation rotor 300, the levitation rotor 300 can generate an axial Lorentz force, and the levitation rotor 300 side axial direction can be generated. Attitude control is possible.

  In the third embodiment, since the secondary coil 313 is wound in a rectangular shape, the conductive wire portions 313a to 313c of the secondary coil 313 can be arranged in a well-balanced manner on the floating rotor 300 as described above. Further, by winding the secondary coil 313 in a rectangular shape, for example, the number of the respective tooth portions 313B can be arbitrarily determined, and the generation location of the Lorentz force F can be arbitrarily set as described above. it can.

  In the third embodiment, the secondary coil 313 may be three-dimensionally arranged. That is, for example, as shown in FIG. 14 (c), the conducting wire portion 313 b shown by a dotted line is embedded toward the rotation center axis of the floating rotor 300, and the conducting wire portion 313 a shown by the dotted line is vertically and horizontally inside the floating rotor 300. The conductive wire portion 313d indicated by a solid line is embedded horizontally on the side of the floating rotor 300, and the conductive wire portion 313c indicated by a solid line is provided vertically on the side of the floating rotor 300. In this case, by causing the permanent magnet 220 to face the conducting wire portion 313d indicated by a solid line, for example, the Lorentz force F in the axial direction can be generated in the floating rotor 300 as described above. In this case, the conducting wire portion 313d is disposed on the outer peripheral surface of the floating rotor 300, similarly to the conducting wire portion 313b (second conducting wire portion) shown in FIGS. Lorentz force F can be generated.

  Further, if the secondary coil 313 is arranged in a three-dimensional manner, the Lorentz force F can be further increased because the conductor portions 313a to 313d can be densely arranged as shown in FIG.

  In addition, about the structure which makes such a secondary coil 313 three-dimensional arrangement | positioning, it can apply similarly also in 1st Embodiment and 2nd Embodiment which were mentioned above.

(Fourth embodiment: energy transmission system)
Next, a fourth embodiment in which the winding method of the secondary coil 313 of the levitation rotor 300 described above is changed will be described with reference to FIGS. 15 to 18. In the drawings described below, the same reference numerals are given to portions common to FIGS. 2 to 7 and FIGS.

  First, as shown in FIG. 15, the energy transmission stator 200 </ b> A is provided with a cylindrical portion 232 having a bottom portion 233. The inner diameter of the cylindrical portion 232 is matched with the outer diameter of the floating rotor 300. Four permanent magnets 220 are embedded in the bottom portion 233 of the cylindrical portion 232 along the circumferential direction. A primary coil 211 is wound around the outer periphery of the cylindrical portion 232. Note that the number of permanent magnets 220 is not limited to four as described above. 1 to 3 may be sufficient and 5 or more may be sufficient.

  In particular, when the number of the permanent magnets 220 is one, the Lorentz force F generated toward the rotation center axis O is one location, and the Lorentz force F is only in one direction. However, the Lorentz force F is continuously generated according to the rotation of the floating rotor 300. For this reason, since the balance in the radial direction of the floating rotor 300 is maintained, the radial position can be controlled. Similarly to the above, the higher the rotational speed of the floating rotor 300, the better the balance at the axial position of the floating rotor 300 is maintained.

  On the other hand, a secondary coil 313 is wound around the outer peripheral surface of the floating rotor 300. In FIG. 15, the groove 312 around which the secondary coil 313 described in FIG. 5B is wound is not shown, but it is needless to say that the groove 312 may be provided similarly. The levitation rotor 300 is provided with a rectifier circuit (not shown). Then, an induced current I caused by mutual induction caused by a change in the magnetic field of the primary coil 211 flows through the secondary coil 313. However, the induced current I flowing through the secondary coil 313 is rectified by the rectifier circuit, and therefore flows only in one direction.

  As shown in FIG. 16A, the levitation rotor 300 is accommodated in the cylindrical portion 232 of the energy transmission stator 200A. In a state where the levitation rotor 300 is housed in the cylindrical portion 232 of the energy transmission stator 200A, the secondary coil 313 on the levitation rotor 300 side is positioned inside the primary coil 211 on the energy transmission stator 200A side. In this state, the primary coil 211 on the energy transmission stator 200A side and the secondary coil 313 on the floating rotor 300 side face each other. Note that the opposing relationship between the primary coil 211 and the secondary coil 313 may be concentric with different height positions or may be concentric with the same height position. In other words, the magnetic field change from the primary coil 211 acts on the secondary coil 313 regardless of the facing relationship.

  Further, as shown in FIG. 16B, in a state where the floating rotor 300 is housed in the cylindrical portion 232 of the energy transmission stator 200A, the permanent magnet 220 on the energy transmission stator 200A side is a secondary coil on the floating rotor 300 side. Confront 313.

  Next, radial position control by the Lorentz force F generated toward the rotation center axis O of the floating rotor 300 will be described. The levitation rotor 300 rotates in a state of being accommodated in the cylindrical portion 232 of the energy transmission stator 200A in the same manner as described above. However, in the fourth embodiment, the induced current I is not generated in the secondary coil 313 by the rotation of the floating rotor 300.

  First, an alternating current is passed through the primary coil 211 on the energy transmission stator 200A side. Thereby, the magnetic field inside the primary coil 211 changes. At this time, an induced current I caused by mutual induction flows through the secondary coil 313 of the floating rotor 300 due to a change in the magnetic field generated by the primary coil 211. Since the direction of the induced current I is rectified by a rectifier circuit (not shown), the direction is only one direction. In FIG. 16 (b), for example, the flow is clockwise.

  At this time, the secondary coil 313 on the floating rotor 300 side and the permanent magnet 220 on the energy transmission stator 200A side face each other. For this reason, the Lorentz force F toward the rotation center axis O is generated in the floating rotor 300 by the magnetic field generated by the permanent magnet 220 and the induced current I flowing through the secondary coil 313. Here, Lorentz force F is generated at four locations of the secondary coil 313. Therefore, Lorentz force F from the four directions toward the rotation center axis O is generated in the floating rotor 300. As a result, the radial position of the floating rotor 300 can be controlled.

In addition, the Lorentz force F generated in the secondary coil 313 by the magnetic field of the permanent magnet 220 on the energy transmission stator 200A side is the same as in the above formula 1.
F = I _total LB _PM N
It is represented by

  The permanent magnet 220 on the energy transmission stator 200A side may be an electromagnet as described above. Thereby, the direction of the Lorentz force F generated in the secondary coil 313 can be changed by changing the polarity of the electromagnet.

  Next, with reference to FIG. 17 to FIG. 18, a description will be given of measurement results of experiments on the induced current I generated in the secondary coil 313. In the following measurement, the energy transmission stator 200A and the floating rotor 300 were made of a non-magnetic material.

  First, the measurement system of the induced current I will be described with reference to FIG. The primary coil 211 on the energy transmission stator 200A side and the secondary coil 313 on the floating rotor 300 side were respectively Litz wires (UEW line, 0.05 × 120). The primary coil 211 on the energy transmission stator 200A side and the secondary coil 313 on the floating rotor 300 side are designed to be concentric. Further, the distance between the axial centers of both coils was changed by a spacer (not shown). Further, the diameter of the primary coil 211 was changed, and the radial gap between the coils was changed.

  The primary coil 211 was supplied with a direct current generated from the stabilized power supply device 810a converted into an alternating current by the push-pull inverter 811. At this time, another stabilized power supply device 812 was connected to the IC of the push-pull inverter 811 in order to control the push-pull inverter 811. Further, a control signal generated from the IC of the push-pull inverter 811 was measured with an oscilloscope 813, and the AC frequency generated in the push-pull inverter 811 was adjusted. Further, a load resistance (not shown) was connected to the secondary coil 313. The induced current I generated in the secondary coil 313 was measured with an ammeter 800.

  In addition, the number of turns of the primary coil 211 and the secondary coil 313 are both 5 turns. Further, the voltage applied to the primary coil 211 was fixed at 9V, and the load resistance (not shown) of the secondary coil 313 was fixed at 3Ω. Further, the AC frequency generated in the push-pull inverter 811 was changed from 50 kHz to 400 kHz and changed in increments of 50 kHz. Further, the axial center distance was changed from −1.0 mm to 1.0 mm, and was changed in 0.5 mm increments. The gap between the primary coil 211 and the secondary coil 313 in the radial direction was changed to 4 mm, 1 mm, and 0.1 mm on one side.

  Next, the measurement result of the induced current I will be described with reference to FIG. First, FIG. 18A shows the measurement results when the axial center distance is set to −1.0 mm to 1.0 mm and is changed in 0.5 mm increments. Note that k represents a coupling coefficient for comparison.

  As can be seen from FIG. 18A, an induced current I having a maximum value of about 0.27 A at a frequency of 50 kHz was obtained in all cases even if the distance in the axial center changed.

  FIG. 18B shows a measurement result when the gap between the primary coil 211 and the secondary coil 313 in the radial direction is changed to 4 mm, 1 mm, and 0.1 mm on one side. As can be seen from FIG. 18B, the induced current value increases as the radial gap decreases. Incidentally, an induced current I having a maximum value of about 0.36 A at a radial gap of 0.1 mm and 50 kHz was obtained.

  From the above measurement results, when the primary coil 211 on the energy transmission stator 200A side and the secondary coil 313 on the floating rotor 300 side are arranged concentrically, an induction current I of about 0.3 A at maximum can be obtained. it can. Therefore, the Lorentz force F generated toward the rotation center axis O can be obtained by the above-described formula 1, and the position of the floating rotor 300 in the radial direction can be controlled.

  Thus, in 4th Embodiment, the cylinder part 232 which accommodates the floating rotor 300 was provided in the energy transmission stator 200A. Moreover, the primary coil 211 was wound around the outer peripheral surface of the cylindrical part 232 of the energy transmission stator 200A. Further, the magnetic poles of the permanent magnets 220 are directed to the surface facing the energy transmission stator 200A of the floating rotor 300. The secondary coil 313 on the floating rotor 300 side is located inside the primary coil 211.

  In this configuration, an induced current I flows through the secondary coil 313 on the floating rotor 300 side due to a change in the magnetic field of the primary coil 211 on the energy transmission stator 200A side. Further, a radial Lorentz force can be generated in the levitating rotor 300 by the permanent magnet 220 with the magnetic pole facing the surface facing the energy transmission stator 200A of the levitating rotor 300 and the induced current I flowing through the secondary coil 313. it can. Thereby, similarly to the above, the attitude control in the radial direction of the floating rotor 300 can be performed with a simple configuration.

(Fifth embodiment: energy transmission system)
Next, with reference to FIG. 19, the fifth embodiment in the case where the positions of the primary coil 211 on the energy transmission stator 200A side and the secondary coil 313 on the floating rotor 300 side in the fourth embodiment are reversed will be described. To do.

  In the fourth embodiment, when the floating rotor 300 is housed in the cylindrical portion 232 of the energy transmission stator 200A, the secondary coil 313 on the floating rotor 300 side is inside the primary coil 211 on the energy transmission stator 200A side. If you are located. In contrast, in the fifth embodiment, the positional relationship between the primary coil 211 on the energy transmission stator 200A side and the secondary coil 313 on the floating rotor 300 side is reversed.

  That is, as shown in FIGS. 19A and 19B, the energy transmission stator 200 </ b> A is provided with a cylindrical portion 232 having a bottom portion 233. A flange portion 231 is provided on the outer periphery of the cylindrical portion 232. A permanent magnet 220 is disposed on the flange portion 231. Further, the primary coil 211 is wound around the outer periphery of the cylindrical portion 232 of the energy transmission stator 200A in the same manner as described above.

  On the other hand, a depression 310 is formed on the floating rotor 300 side. The size of the depression 310 is such that the cylindrical portion 232 of the energy transmission stator 200A is fitted. Further, the secondary coil 313 is wound around the outer periphery of the floating rotor 300 in the same manner as described above. In FIG. 19, the groove 312 around which the secondary coil 313 described in FIG. 5B is wound is not shown, but it is needless to say that it may be provided in the same manner.

  In such a configuration, when the cylindrical portion 232 of the energy transmission stator 200A is fitted in the recess 310 on the floating rotor 300 side, the secondary coil 313 on the floating rotor 300 side is outside the primary coil 211 on the energy transmission stator 200A side. Is located. Further, the secondary coil 313 on the floating rotor 300 side and the permanent magnet 220 disposed on the flange portion 231 on the energy transmission stator 200A side face each other.

  When an alternating current is passed through the primary coil 211 on the energy transmission stator 200A side, the magnetic field inside the primary coil 211 changes. At this time, an induced current I caused by mutual induction flows through the secondary coil 313 of the floating rotor 300 in the same manner as described above due to a change in the magnetic field generated by the primary coil 211.

  At this time, the secondary coil 313 on the floating rotor 300 side and the permanent magnet 220 arranged on the flange portion 231 on the energy transmission stator 200A side face each other. For this reason, as described above, the Lorentz force F toward the rotation center axis O is generated in the floating rotor 300 by the magnetic field generated by the permanent magnet 220 and the induced current I flowing through the secondary coil 313. As a result, the radial position of the floating rotor 300 can be controlled.

  The permanent magnet 220 may be an electromagnet as described above. In this case, the direction of the Lorentz force F can be changed by changing the polarity of the electromagnet.

  As described above, in the fifth embodiment, the energy transmission stator 200A is provided with the cylindrical portion 232 around which the primary coil 211 is wound on the outer peripheral surface, and the magnetic poles of the permanent magnet 220 are used as the energy transmission stator 200A of the levitation rotor 300. It turned to the surface which confronts. Further, the levitation rotor 300 is provided with a recess 310 into which the cylindrical portion 232 is fitted. The secondary coil 313 is positioned outside the primary coil 211.

  In this configuration, even if the secondary coil 313 on the floating rotor 300 side is configured to be positioned outside the primary coil 211 on the energy transmission stator 200A side, the magnetic field of the primary coil 211 on the energy transmission stator 200A side Due to the change, the induced current I flows through the secondary coil 313 on the floating rotor 300 side. Further, a radial Lorentz force F is generated in the levitation rotor 300 by the permanent magnet 220 directed to the surface of the levitation rotor 300 facing the energy transmission stator 200A and the induced current I flowing through the secondary coil 313. be able to. Thereby, similarly to the above, the attitude control in the radial direction of the floating rotor 300 can be performed with a simple configuration.

(Sixth embodiment)
Next, with reference to FIG. 20, a sixth embodiment in which the configuration of the magnetic levitation posture control device in FIG. 15 is changed will be described.

  First, the energy transmission stator 200 </ b> A is provided with a cylindrical portion 232 having a bottom portion 233. A flange portion 236 that is concentric with the cylindrical portion 232 is provided on the outer periphery of the cylindrical portion 232. Further, the primary coil 211 is wound around the outer periphery of the cylindrical portion 232 in the same manner as described above. Inside the flange portion 236, a permanent magnet 220 having a magnetic pole directed toward the cylindrical portion 232 is disposed. The number of permanent magnets 220 may be one or more as described above. Further, the permanent magnet 220 may be an electromagnet as described above.

  On the other hand, a depression 310 is formed on the floating rotor 300 side. The size of the depression 310 is such that the cylindrical portion 232 of the energy transmission stator 200A is fitted. Further, the secondary coil 313 is wound around the outer periphery of the floating rotor 300 in the same manner as described above. In FIG. 20, the groove 312 around which the secondary coil 313 described in FIG. 5B is wound is not shown, but it is needless to say that it may be provided in the same manner. Further, as described above, the primary coil 211 and the secondary coil 313 may be concentric with different height positions, or may be concentric with the same height position.

  In such a configuration, when the cylindrical portion 232 of the energy transmission stator 200A is fitted in the recess 310 on the floating rotor 300 side, the secondary coil 313 on the floating rotor 300 side is outside the primary coil 211 on the energy transmission stator 200A side. Is located. In addition, the secondary coil 313 on the floating rotor 300 side and the permanent magnet 220 arranged on the flange portion 236 on the energy transmission stator 200A side face each other.

  When an alternating current is passed through the primary coil 211 on the energy transmission stator 200A side, the magnetic field inside the primary coil 211 changes. At this time, an induced current I caused by mutual induction flows through the secondary coil 313 of the floating rotor 300 in the same manner as described above due to a change in the magnetic field generated by the primary coil 211. In addition, the induction current I of only one direction flows into the secondary coil 313 by the rectifier circuit which is not shown in figure shown in the floating rotor 300 similarly to the above.

  At this time, the secondary coil 313 on the floating rotor 300 side and the permanent magnet 220 arranged on the flange portion 231 on the energy transmission stator 200A side face each other. For this reason, as described above, the Lorentz force F indicated by the arrow along the rotation center axis of the floating rotor 300 is generated in the floating rotor 300 by the magnetic field generated by the permanent magnet 220 and the induced current I flowing through the secondary coil 313. Thereby, the position control of the floating rotor 300 in the axial direction is possible.

  As described above, in the sixth embodiment, the energy transmission stator 200A has the cylindrical portion 232 around which the primary coil 211 is wound on the outer peripheral surface, and the flange that covers the outer periphery of the cylindrical portion 232 and the permanent magnet 220 is disposed on the inner side. Part 236. Further, the floating rotor 300 is provided with a recess 310 into which the cylindrical portion 232 is fitted. In addition, the secondary coil 313 is positioned outside the primary coil 211, and the magnetic poles of the permanent magnets 220 are directed toward the outer peripheral surface of the floating rotor 300.

  In this configuration, an induced current I flows through the secondary coil 313 on the floating rotor 300 side due to a change in the magnetic field of the primary coil 211 on the energy transmission stator 200A side. Further, an axial Lorentz force F can be generated in the levitation rotor 300 by the permanent magnet 220 having the magnetic pole directed toward the outer peripheral surface of the levitation rotor 300 and the induced current I flowing through the secondary coil 313.

  Note that the permanent magnet 220 may be disposed between the tube portion 232 and the flange portion 236. In this case, since the permanent magnet 220 is disposed above the secondary coil 313, the floating rotor 300 can generate a radial Lorentz force F.

  In the first to sixth embodiments, the Lorentz force F is generated in the floating rotor 300 by the induced current I flowing through the secondary coil 313 and the magnetic field generated by the permanent magnet 220, and the attitude control in the radial direction or the axial direction is performed. It is configured to perform. However, the present invention is not limited to this configuration, and a storage mechanism that stores the induced current I of the secondary coil 313 on the floating rotor 300 side, a sensor that detects its own attitude, and a current output control circuit are further provided, and the detection result of the sensor The current output control circuit may send the energy of the saving mechanism based on the above. Note that a capacitor, a secondary battery, or the like can be used as the saving mechanism. Moreover, a magnetic sensor etc. can be used as a sensor. With such a configuration, the energy stored in the saving mechanism can be used instantaneously. Thereby, in addition to the Lorentz force F, posture control using a reluctance force by an electromagnet is also possible.

DESCRIPTION OF SYMBOLS 100 Magnetic levitation attitude control apparatus 200 Electromagnetic induction stator 200A Energy transmission stator 210 Salient pole 210a Permanent magnet 211 Primary coil 220 Permanent magnets 231 and 236 Flange part 232 Cylindrical part 232a Inner surface 233 Bottom part 300, 300A Levitation rotor 310 Dent 312 Groove 313 2 Next coil 313A, 313B Tooth part 313a-313d Conductor part 314 Nonmagnetic body 314a Engagement hole 315 Magnetic body 318 Insulating tape 400 Impeller 500 Rotor 600 Rotation control stator 700 Magnetic levitation apparatus 800 Ammeter 810a Stabilized power supply 811 Push-pull type Inverter 812 Stabilized power supply 813 Oscilloscope

Claims (8)

An electromagnetic induction stator;
A floating rotor facing the electromagnetic induction stator,
The electromagnetic induction stator is provided with a first magnet for generating an induced current and a second magnet for generating a Lorentz force,
The levitation rotor is wound with a secondary coil having first and third conductor portions traversing the magnetic field of the first magnet and a second conductor portion traversing the magnetic field of the second magnet,
Due to the rotation of the floating rotor, an induced current flowing in the first or third conductor portion and a magnetic field of the second magnet traversed by the second conductor portion cause the floating rotor to move radially or axially. A magnetic levitation posture control device configured to generate a directed Lorentz force. The secondary coil is disposed on a surface facing the electromagnetic induction stator, the first conductive wire portion extends from the rotation center axis side of the floating rotor toward the outer peripheral side, and the second conductive wire portion is It extends in the circumferential direction of the floating rotor, and the third conductor portion is wound so as to extend from the outer peripheral side of the floating rotor toward the rotation center axis side,
The first magnet is disposed at a position through which the first and third conductor portions pass,
The magnetic levitation posture control apparatus according to claim 1, wherein the second magnet is disposed at a position through which the second conductor portion passes. The secondary coil is disposed on an outer peripheral surface, the first conductive wire portion extends from one surface side of the floating rotor toward the other surface side, and the second conductive wire portion extends along the outer peripheral direction of the floating rotor. The third conductor portion is wound so as to extend from the other surface side of the floating rotor toward the one surface side,
The first magnet is disposed at a position through which the first and third conductor portions pass,
The magnetic levitation posture control apparatus according to claim 1, wherein the second magnet is disposed at a position through which the second conductor portion passes. A floating rotor,
An energy transmission stator facing the floating rotor,
A secondary coil is wound around the outer peripheral surface of the floating rotor,
The energy transmission stator is provided with a primary coil wound so as to be concentric with the secondary coil, and a magnet facing the secondary coil,
A Lorentz force directed in the radial direction or the axial direction is generated in the floating rotor by an induced current flowing in the secondary coil accompanying a change in the magnetic field of the primary coil and a magnetic field of the magnet traversed by the secondary coil. A magnetic levitation posture control apparatus characterized by being configured as described above. The energy transmission stator includes the floating rotor, and a cylindrical portion around which the primary coil is wound is provided on an outer peripheral surface, and the magnetic pole of the magnet faces the energy transmission stator of the floating rotor. Faced,
The magnetic levitation posture control apparatus according to claim 4, wherein the secondary coil is configured to be positioned inside the primary coil. The energy transmission stator is provided with a cylindrical portion around which the primary coil is wound on an outer peripheral surface, and the magnetic pole of the magnet is directed to the surface of the floating rotor facing the energy transmission stator,
The floating rotor is provided with a recess into which the cylindrical portion is fitted,
The magnetic levitation posture control apparatus according to claim 4, wherein the secondary coil is configured to be located outside the primary coil. The energy transmission stator is provided with a cylindrical portion around which the primary coil is wound on an outer peripheral surface, and a flange portion that covers the outer periphery of the cylindrical portion and in which the magnet is disposed on the inner side.
The floating rotor is provided with a recess into which the cylindrical portion is fitted,
5. The magnetic levitation posture according to claim 4, wherein the secondary coil is positioned outside the primary coil, and the magnetic pole of the magnet is directed toward the outer peripheral surface of the levitation rotor. Control device.   The magnetic levitation posture control apparatus according to claim 1, wherein an induced current in only one direction rectified by a rectifier circuit flows through the secondary coil.

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