CH713941A2 - AC / DC double ball surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery. - Google Patents

Abstract

The present invention discloses a 5-degree AC / DC double-spherical-surface mixed magnetic bearing for a vehicle flywheel battery, wherein the radial stator is formed by coaxially arranging an upper radial stator (1) and a lower radial stator whose yoke portions are integrally connected to each other and at the upper end of the yoke portion of the upper radial stator and the lower end of the yoke portion of the lower radial stator, three radial stator poles (16) are uniformly arranged along the circumferential direction, and the inner end surface of each radial stator pole respectively is a concave spherical surface, and wherein at the upper and lower ends of the middle cylinder each having a cylinder connected to the upper end of the upper connecting body and a lower end of the cylinder connected to the lower connecting body, and wherein the side walls of the cylinder of the upper and lower end are each a convex spherical surface; and wherein each concave spherical surface is longitudinally corresponding to exactly the convex spherical surface, and outside of the middle cylinder, the axial stator (5) is interleaved, and at the upper side of the upper axial stator (51) and the lower side of the lower axial stator (52 ) In each case an annular permanent magnet is installed. For the opposite surfaces of the stator and the rotor (7) is used in each case a spherical surface structure. This can eliminate the occurrence of a gyroscopic effect. Upon deflection or displacement of the rotor (7) of the magnetic bearing, the electromagnetic force is directed to the ball center of the rotor (7) to reduce a disturbance torque generated by the stator magnetic pole on the rotor (7).

Description

description

TECHNICAL FIELD The present invention relates to a magnetic suspension bearing without non-mechanical contact, particularly an AC / DC five degree of freedom mixed magnetic bearing which is suitable for magnetic suspension support of a vehicle flywheel battery for electric vehicles.

BACKGROUND ART Currently, the performance of the vehicle battery is a major problem that restricts the development of the electric vehicle. Using the magnetic suspension support and the inertia of rotation of the flywheel, the vehicle flywheel battery realizes the energy storage, and it has good charging efficiency, high specific power, small mass, no pollution and long life and other advantages. The currently existing flywheel batteries generally use an electromagnetic permanent magnet mixed magnetic bearing as a support for the flywheel rotor in order to realize a five degree of freedom suspension in the radial and axial direction. The stator of the mixed magnetic bearing is designed as a cylindrical structure, and the associated rotor is also cylindrical. Although the magnetic bearing with the structure can ensure stable suspension operation of the flywheel battery, a gyroscopic effect is inevitably caused when the flywheel battery is disturbed by the outside environment. When a vehicle is started, suddenly stopped and bent, etc., the vehicle flywheel battery causes a very high gyroscopic moment to be exerted on the flywheel shaft in the restricting direction, so that a very large additional pressure is applied to the flywheel shaft or the magnetic bearing due to the current magnetic bearing structure can very difficultly avoid the occurrence of a gyroscopic effect. In addition, in the currently existing magnetic bearings, the design of the axial control is usually realized by additionally installing a thrust washer on the rotor; the design not only increases the mass of the rotor, but also increases the friction when the flywheel battery is running at a high speed. and loss of drag of the axis of rotation is also increased; in addition, the thrust washer will increase the linear peripheral speed of the rotor, thereby limiting the maximum speed of the rotor.

SUMMARY OF THE PRESENT INVENTION It is an object of the present invention to address the problems of currently existing flywheel batteries with increased mass of the rotor and susceptibility to the occurrence of a gyroscopic effect of an AC / DC double-spherical surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery to provide a compact structure, small volume, small mass, and ability to inhibit the gyroscopic effect.

An AC / DC double spherical surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery according to the present invention is realized by the following technical solution: outside the rotor, an axial stator and a radial stator are placed coaxially, the radial stator being formed thereby that an upper radial stator and a lower radial stator whose yoke sections are integrally connected to one another are arranged coaxially, and wherein the upper and lower yoke sections form a chamber of the radial stator poles, and wherein at the upper end of the yoke section of the upper radial stator and 3 radial stator poles are evenly arranged along the circumferential direction at the lower end of the yoke portion of the lower radial stator, and the surface of the inner end of each radial stator pole is a concave spherical surface, and a radial control coil is wound on each radial stator pole lt is; and wherein a central cylinder is provided in the center of the rotor, and wherein an upper and lower end cylinder and a lower end cylinder are provided at the upper and lower ends, and one with the cylinder at the upper and lower ends of the central cylinder the upper end connected upper connecting body and a lower connecting body connected to the cylinder of the lower end are provided, and wherein the side walls of the cylinder of the upper and lower ends are each a convex spherical surface and each concave spherical surface at the inner end of the upper and lower radial stator pole longitudinally correspondingly facing the convex spherical surface of the cylinder of the upper and lower ends, and wherein there is an air gap between the concave spherical surface and the convex spherical surface, and wherein the spherical centers of the precisely facing concave spherical surface and convex spherical surface overlap; and wherein an axial stator is firmly nested outside the central cylinder, and wherein the axial stator is formed by a coaxially arranged disc-shaped upper axial stator and lower axial stator with the same structure, and wherein a disc-shaped one between the upper axial stator and the lower axial stator Magnetisolieraluminiumring is pressed overlapping, and wherein the inner cavities of the upper axial stator and lower axial stator and the magnetic insulating aluminum ring form a chamber of the axial stator, and wherein in the chamber of the axial stator is arranged an axial control coil closely contacting its inner wall, and wherein at the top of the Upper axial stator and the underside of the lower axial stator each have an annular permanent magnet pressed between the axial stator and the radial stator pole, and wherein is installed

CH 713 941 A2 the upper and lower ring-shaped permanent magnets have the same structure and are each axially magnetized, and the magnetization directions are opposite.

In comparison with the prior art, the present invention has the following advantages:

1. For the opposite surfaces of the stator and the rotor of the double-spherical mixed magnetic bearing according to the present invention, a spherical surface structure is used, thereby the axial size of the magnetic bearing can be effectively reduced; when the rotor of the magnetic bearing is deflected or displaced, the electromagnetic force is directed to the center of the ball of the rotor in order to reduce an interference torque generated by the stator magnetic pole on the rotor and to improve the control accuracy of the magnetic bearing. The spherical surface structure of the stator and the rotor can further eliminate the occurrence of the gyroscopic effect, and the spherical surface structure is conducive to multidimensional movement and for performing spatial positioning and work, in addition, the distribution of the magnetic field of the air gap by means of the spherical surface structure becomes more uniform and symmetrical made what is conducive to the control and analysis of the rotor.

2. In the present invention, the space of the radial stator of the magnetic bearing is fully used, and the permanent magnets are installed in the upper chamber of the radial stator and the lower chamber of the radial stator, respectively, thereby reducing the axial size of the magnetic bearing and suppresses the gyroscopic effect of the rotor to the limit, moreover the structure becomes more compact.

3. In terms of axial control, the present invention uses a rotor structure without a thrust washer, thereby reducing the mass of the rotor, further reducing the friction and drag loss of the axis of rotation, which is conducive to high-speed operation of the rotor, and the axial control accuracy is improved.

4. The axial coil according to the present invention has a large space, due to which a high axial load capacity can be realized.

5. The present invention uses an integrated structure with 5 degrees of freedom, there is a high degree of integration to shorten the length of the axis, reduce the volume of the flywheel battery and save material.

BRIEF DESCRIPTION OF THE DRAWING [0011]

1 shows a sectional view of the internal structure of the present invention;

Figure 2 shows a top view of the present invention;

FIG. 3 shows a view of the partial structure of a radial stator according to FIG. 1;

FIG. 4 shows a perspective view of a rotor structure according to FIG. 1;

5 shows a view of the mounting structure of a radial stator according to FIG. 3 and a rotor according to FIG.

4;

FIG. 6 shows a perspective structural view of an axial stator according to FIG. 1;

FIG. 7 shows a view of the mounting structure of an axial stator according to FIG. 6 and a rotor according to FIG. 4;

8 shows a front view of the mounting structure of a radial stator, a radial control coil, an axial stator and an annular permanent magnet according to FIG. 1;

Fig. 9 shows a principle diagram of the static passive suspension of the present invention.

Fig. 10 shows a principle diagram of the radial two-degree of freedom compensation control of the present invention;

Fig. 11 shows a principle diagram of the radial rotating two-degree of freedom compensation control of the present invention;

Fig. 12 shows a principle diagram of the axial single degree of freedom compensation control of the present invention.

LIST OF REFERENCE SIGNS [0012]

Upper radial stator

Axial stator

CH 713 941 A2

6 Axial control coil 7 Rotor 8 Lower radial stator 11, 12, 13 Upper radial stator pole 16 Chamber of radial stator poles 17 Chamber of the axial stator 21, 22, 23 Upper radial control coil 31 Upper ring-shaped permanent magnet 32 Lower ring-shaped permanent magnet 41 Upper magnetic insulating aluminum ring 42 Magnetisolieraluminiumring 43 Lower magnetic insulating aluminum ring 51 Upper axial stator 52 Lower axial stator 53 Big slice 54 Middle ring body 55 Small disc 71 Top end cylinder 72 Upper connector body 73 Middle cylinder 74 Lower connector body 75 Bottom end cylinder 81, 82, 83 Lower radial stator pole 91, 92, 93 Lower radial coil 211 Upper concave spherical surface 711 Upper convex spherical surface 751 Lower convex spherical surface 811 Lower concave spherical surface

DETAILED DESCRIPTION See Figs. 1 and 2, a rotor 7 is arranged in the middle of the present invention, an axial stator 5 and a radial stator being placed coaxially outside the rotor 7.

The radial stator is formed by an upper radial stator 1 and a lower radial stator 8, the upper radial stator 1 and the lower radial stator 8 being arranged coaxially along the axial direction of the rotor 7. The yoke portions of the upper radial stator 1 and the lower radial stator 8 are arranged coaxially at the upper and lower positions along the axial direction of the rotor 7, the upper and lower yoke portions being integrally connected to each other and forming a hollow cylinder, and wherein the inner cavity of the hollow cylinder is a chamber of the radial stator poles 16.

The upper end surface of the upper radial stator 1 and the upper end surface of the rotor 7 are flush with each other, while the lower end surface of the lower radial stator 8 and the lower end surface of the rotor 7 are flush with each other.

CH 713 941 A2 In the chamber of the radial stator poles 16, three radial stator poles are arranged uniformly along the circumferential direction at the upper end of the yoke section of the upper radial stator 1 and the lower end of the yoke section of the lower radial stator 8, each having 3 upper radial ones Stator poles 11, 12, 13 and three lower radial stator poles 81, 82, 83 are the shapes of the 3 upper radial stator poles 11, 12, 13 and the 3 lower radial stator poles 81, 82, 83 are completely identical to one another, the upper ones and lower projections overlap. The upper end surface of the 3 upper radial stator poles 11, 12, 13 is flush with the upper end surface of the yoke portion of the upper radial stator 1, the lower end surface of the 3 lower radial stator poles 81, 82, 83 flush with the lower end surface of the Yoke section of the lower radial stator 8 is aligned. Radial control coils are wound on each radial stator pole, which correspond to the upper radial control coil 21, 22, 23 and the lower radial coil 91, 92, 93, the 6 completely identical radial control coils corresponding to one another on the upper radial stator poles 11, 12, 13 and the lower radial stator poles 81, 82, 83 are wound.

At the inner end of the three upper radial stator poles 11, 12, 13 and the three lower radial stator poles 81, 82, 83, a pole piece is arranged, the surface of the pole piece being designed as a concave spherical surface. As shown in FIG. 3, only the upper radial stator pole 11 and the lower radial stator pole 81 are explained by way of example:

The surface of the pole piece of the upper radial stator pole 11 is processed as an upper concave spherical surface 111, while the surface of the pole piece of the lower radial stator pole 81 is processed as a lower concave spherical surface 811.

As shown in Fig. 4, the rotor 7 is a longitudinally symmetrical structure in the axial direction, with a middle cylinder 73 being provided in the middle, and with the same hollow cylinder being provided at each of the upper and lower ends each represent a cylinder of the upper end 71 and a cylinder of the lower end 75. At the upper and lower ends of the middle cylinder 73, an upper connecting body 72 connected to the cylinder of the upper end 71 and a lower connecting body 74 connected to the cylinder of the lower end 75 are arranged. The side walls of the cylinder of the upper end 71 and the cylinder of the lower end 75 are formed in a structure of the convex spherical surface, the side wall of the cylinder of the upper end 71 being an upper convex spherical surface 711 and the side wall of the cylinder of the lower End 75 is a lower convex spherical surface 751. In the axial direction, the outer diameter of the entire rotor 7 gradually increases from the center to both ends, the outer diameter of the central cylinder 73 being smaller than the outer diameter of the upper connecting body 72 and the lower connecting body 74, and the outer diameter of the upper connecting body 72 and the lower connecting body 74 is the same as the outer diameter of the upper and lower end surfaces of the cylinder of the upper end 71 and the cylinder of the lower end 75.

As shown in Fig. 1, each concave spherical surface at the inner end of the 3 upper radial stator poles 11, 12, 13 and the 3 lower radial stator poles 81, 82, 83 is longitudinal in the radial direction, corresponding exactly to the convex spherical surface of the cylinder facing the upper end 71 and the cylinder of the lower end 75 of the rotor 7, a radial air gap of 0.5 mm is maintained between the concave spherical surface and the convex spherical surface, and the concave spherical surface and the convex spherical surface have an equal thickness in the axial Direction. When the rotor 7 is in an equilibrium position, the spherical centers of the upper convex spherical surface of the rotor 7 and the concave spherical surface of the upper radial stator poles 11, 12, 13 overlap, while the spherical centers of the lower convex spherical surface 75 of the rotor 7 and the lower radial Stator poles 81, 82, 83 overlap. In Fig. 5 there is only an explanation with the arrangement structure of the upper radial stator pole 11 and the lower radial stator pole 81 and the rotor 7 as an example: the upper concave spherical surface 211 of the upper radial stator pole 11 fits in the radial direction on the upper convex spherical surface 711 the rotor 7, and between the two a radial gap of 0.5 mm is maintained; the lower concave spherical surface 811 of the lower radial stator pole 81 fits in the radial direction on the lower convex spherical surface 751 of the rotor 7, and a radial gap of 0.5 mm is held between the two.

As shown in Fig. 1, outside the central cylinder 73 of the rotor 7, a disk-shaped axial stator 5 is fixed in a center located in the chamber of the radial stator poles 16, the axial stator 5 being located in the axial direction between the upper ones radial control coils 21, 22, 23 and the lower radial coils 91, 92, 93 is located and does not come into contact with the radial control coils. The axial stator 5 is formed by an upper axial stator 51 and a lower axial stator 52, the upper axial stator 51 and the lower axial stator 52 having the same structure, both of which are disc-shaped and running longitudinally along the axial direction of the central cylinder 73 are arranged coaxially. A disc-shaped magnetic insulating aluminum ring 42 is pressed between the upper axial stator 51 and the lower axial stator 52, with an outer diameter of the upper axial stator 51, the lower axial stator 52 and the magnetic insulating aluminum ring 42 each being the same as the inner diameter of the chamber of the radial stator poles 16 and is firmly connected to the inner wall of the chamber of the radial stator poles 16. The inner cavities of the upper axial stator 51, the lower axial stator 52 and the magnetic insulating aluminum ring 42 form a chamber of the axial stator 17, wherein in the chamber of the axial stator 17 an axial control coil 6 is coaxially fixed by a coil holder, and the axial control coil 6

CH 713 941 A2 closely touches the inner wall of the chamber of the axial stator 17 and they are jointly placed outside the central cylinder 73, and a gap is held between them and the central cylinder 73.

As shown in Fig. 6 and 1, the upper axial stator 51 and the lower axial stator 52 of the axial stator 5 are each formed by a large disk 53, a central ring body 54 and a small disk 55 in the axial Direction are connected one behind the other. The magnetic insulating aluminum ring 42 is pressed overlapping between the same upper and lower large disk 53, the inner diameter and the outer diameter of the magnetic insulating aluminum ring 42 being assigned the same as the inner diameter and the outer diameter of the large disk 53. One end face of the large washer 53 is connected to the small washer 55 by the central ring body 54, the inner diameter of the central annular body 54 being the same as the inner diameter of the large washer 53, and the outer diameter of the central annular body 54 being the same as the outer diameter of the small ones Disk 55 is, however, much smaller than the outside diameter of the large disk 53, and the inside diameter of the small disk 55 is smaller than the inside diameter of the large disk 53, which means that there is a step between the outer wall of the small disk 55 and the outer wall of the large disk 53 formed so that there is an axial gap. The axial distance between the upper end face of the small disk 55 of the upper axial stator 51 and the upper radial stator poles 11, 12, 13 is the same as the axial distance between the lower end face of the small disk 55 of the lower axial stator 52 and the lower radial stator poles. The axial control coil 6 closely contacts the inner walls of the two middle ring bodies 54 and the two large disks 53, an axial control magnetic field being able to be generated in the interior of the ring body 54 when the axial control coil 6 is switched on.

As shown in Fig. 7, an axial air gap of 0.5 mm is held in the axial direction between the upper end surface of the small disk 55 of the upper axial stator 51 and the lower end surface of the upper connecting body 72 of the rotor 7 when the rotor 7 is in an equilibrium position. An inner diameter of the small disk 55 of the upper axial stator 51 is the same as an outer diameter of the upper connecting body 72 of the rotor 7. There is also an axial air gap of 0.5 mm in the axial direction between the lower end face of the small disk 55 of the lower axial stator 52 and the upper end surface of the lower connecting body 74 of the rotor 7, wherein an inner diameter of the small disk 55 of the lower axial stator 52 is the same as an outer diameter of the lower connecting body 74 of the rotor 7.

As shown in FIGS. 8 and 1, an annular permanent magnet is installed on the upper side of the large disk 53 of the upper axial stator 51 and the underside of the large disk 53 of the lower axial stator 52, namely an upper annular permanent magnet 31 and a lower annular permanent magnet 32, the upper annular permanent magnet 31 and the lower annular permanent magnet 32 having the same structure, and each made of a high-performance rare earth material - neodymium-iron-boron - and axially magnetized, and wherein the upper annular permanent magnet 31 and the lower annular permanent magnet 32 have an opposite magnetization direction, and the S poles of the ring-shaped permanent magnet are opposite to each other. The annular permanent magnet is pressed tightly overlapping between the axial stator 5 and the radial stator pole, the upper annular permanent magnet 31 being pressed overlapping between the large disk 53 of the upper axial stator 51 and the upper radial stator poles 11, 12, 13, and wherein lower annular permanent magnet 32 is pressed overlapping between the lower axial stator 52 and the lower radial stator poles 81, 82, 83. An inner diameter of the upper annular permanent magnet 31 and the lower annular permanent magnet 32 is larger than an outer diameter of the small disk 55, this ensures that a certain radial gap between the annular permanent magnet and the central ring body 54 or the small disk 55 of the axial Stator 5 is held to ensure that the axial magnetic circuit in the axial stator 5 is not influenced by the annular permanent magnet.

Outside an annular permanent magnet, a magnetic insulating aluminum ring is placed, which is nested at the same time on the outer wall of the annular permanent magnet and the inner wall of a shaft of the chamber of the radial stator 16. An upper magnetic insulating aluminum ring 41 is placed outside the upper annular permanent magnet 31, while a lower magnetic insulating aluminum ring 43 is placed outside the lower annular permanent magnet 32, the upper magnetic insulating aluminum ring 41 and the lower magnetic insulating aluminum ring 43 having a completely identical structure and their axial height being the same that of the upper annular permanent magnet 31 and the lower annular permanent magnet 32. The upper magnetic insulating aluminum ring 41 and the lower magnetic insulating aluminum ring 43 are first fitted to the outer wall of the upper annular permanent magnet 31 and the lower annular permanent magnet 32 by a press fit, respectively, and then tightly connected to the inner wall of the shaft of the chamber of the radial stator 16 by cold pressure welding. There is no contact or interference between the ring-shaped permanent magnet and the magnetic insulating aluminum ring and the upper radial control coils 21, 22, 23 and the lower radial coils 91, 92, 93.

[0026] In operation of the present invention, static passive suspension, radial dual freedom equilibrium, radial torsional dual freedom equilibrium, and axial single freedom equilibrium can be realized. Regarding the axial control, the axial control coil is switched on with direct current, so that they form an electromagnet with the axial stator, by varying and controlling the size and direction of the direct current, the size and direction of the force acting on the rotor are changed in the axial direction to realize an axial single degree of freedom control. Regarding the radial control, the one on an upper and

CH 713 941 A2 lower group of three magnetic pole radial spherical surface stators arranged radial control coil with three-phase alternating current switched on, by varying the size of the current of the radial control coil, an accurate four-time degree control in the radial direction is realized. Details are as follows:

Realization of a static passive suspension: see Fig. 9, a bias magnetic flux generated by the upper annular permanent magnet 31 and the lower annular permanent magnet 32 are shown as dotted line and arrow in Fig. 10, from the N-pole of the upper annular permanent magnet 31, the bias magnetic flux generated by the upper annular permanent magnet 31 goes to the upper radial stator pole 11 and then successively to the radial air gap, the upper convex spherical surface 711 of the rotor 7, the upper connecting body 72 of the rotor 7, the axial air gap and the upper axial stator 51 of the axial stator 5 passes and at the end returns to the S pole of the upper permanent magnet 31. Analogously, the bias magnetic flux generated by the lower annular permanent magnet 32 goes from the N pole of the lower annular permanent magnet 32 to the lower radial stator pole 81 and then successively to the radial air gap, the lower convex spherical surface 751 of the rotor 7, the lower connecting body 74 of the Rotor 7, the axial air gap and the lower axial stator 52 of the axial stator 5 and at the end resigns to the S pole of the lower annular permanent magnet 32. When the rotor 7 is at an intermediate equilibrium position, the central axis of the rotor 7 and the axial central axis of the magnetic bearing overlap, in the radial direction the air gap magnetic fluxes between the convex spherical surfaces of the cylinder of the upper end 71 and the cylinder of the lower end 75 of the The rotor 7 and the concave spherical surfaces of the upper radial stator pole 11 and the lower radial stator pole 81 are completely identical to one another, as a result of which an electromagnetic force exerted on the rotor 7 in the radial direction is balanced in order to realize a radially stable suspension of the rotor 7. In the axial direction, the axial air gap magnetic flux between the upper axial stator 51 and the rotor 7 is completely identical to the axial air gap magnetic flux between the lower axial stator 52 and the rotor 7, and an electromagnetic force exerted on the rotor 7 in the axial direction is balanced , on the basis of this, an axially stable suspension of the rotor 7 is realized.

Realization of a radial two-degree of freedom equilibrium: see FIG. 10, if the rotor 7 is disturbed at the radial two-degree of freedom X, Y and deviates from the equilibrium position, the upper radial control coils 21, 22, 23 and the lower radial control coils 91, 92, 93 is switched on, and the generated individual magnetic flux is directed in a direction facing away from the position deviation, a corresponding magnetic suspension force of the radial control is generated, so that the rotor 7 returns to the radial equilibrium position. It is assumed that the rotor 7 is disturbed in the forward direction of the radial Y-axis and deviates from the equilibrium position, the upper radial control coils 21, 22, 23 and the lower radial control coils 91, 92, 93 are each switched on, the generated control magnetic flux 10 is shown as bold solid lines and arrows according to FIG. 10, the bias magnetic flux generated by the upper ring-shaped permanent magnet 31 and the lower ring-shaped permanent magnet 32 is shown as dashed lines and arrows according to FIG. 10, which through the interior of the upper radial stator poles 11, 13 and the lower radial stator poles 81, 83 bias magnetic flux and the control magnetic flux have opposite directions, and the entire magnetic flux is weakened. The bias magnetic flux and the control magnetic flux in the upper radial stator pole 22 and the lower radial stator pole 82 have the same direction, so that the entire magnetic flux is increased, thus the radial single magnetic flux in the backward direction of the Y-axis is increased, and the magnetic tensile forces F1 and F2 in the backward direction of the Y axis act on the rotor 7 so that it returns to the equilibrium position.

Realization of a radial torsion two degrees of freedom equilibrium: see FIG. 11, if the rotor 7 is disturbed at the radial torsion degree of freedom (θχ, Oy) and deviates from the equilibrium position, the upper radial control coils 21, 22, 23 and the lower radial control coils 91, 92, 93 are switched on, and the generated individual magnetic flux is directed in a direction away from the position deviation, thereby generating a torque so that the rotor 7 returns to the radial equilibrium position. It is assumed that the rotor 7 under torsion has a torsion in the forward direction of the Y axis, the torsion angle Ox, which is control magnetic flux generated after the upper radial control coils 21, 22, 23 are switched off, like bold solid lines and arrows according to FIG 11, the bias magnetic flux generated by the upper annular permanent magnet 31 and the lower annular permanent magnet 32 is shown as broken lines and arrows according to FIG. It can be found that the bias magnetic flux and the control magnetic flux in the upper radial stator poles 21, 23 have opposite directions and the total magnetic flux in the upper radial stator poles 21, 23 is weakened, while the bias magnetic flux and the control magnetic flux in the radial stator pole of the upper part 22 have the same direction and the entire magnetic flux is amplified, and a magnetic tensile force F1 in the backward direction of the Y-axis acts on the rotor 7. After the connection of the lower radial control coils 91, 92, 93 they have through the interior of the lower radial stator poles The bias magnetic flux and the control magnetic flux passing through 81, 83 have an identical direction, and the total magnetic flux passing through the lower radial stator poles 81, 83 is increased, while the bias magnetic flux and the control magnetic flux passing through the lower radial stator pole 82 have opposite directions n, and the entire magnetic flux is weakened. The magnetic tensile forces F3, F4 of the lower radial stator poles 81, 83 act on the rotor 7 and compose a magnetic tensile force F2, which is directed in a forward direction of the Y axis, due to which a restoring torsional moment is exerted on the rotor 7, so that he returns to the equilibrium position.

CH 713 941 A2 Realization of an axial single degree of freedom active control: see FIG. 12, the axial control coil 6 is switched on with direct current, if the rotor 7 has a positional deviation in the axial direction, the magnitude and the direction of the current are changed by a Varying the DC current is changed by varying the magnitude of the axial air gap magnetic flux between the upper axial stator 51 and the rotor 7 and the axial air gap magnetic flux between the lower axial stator 52 and the rotor 7, a magnetic tensile force is generated at the axial air gap, so that the Rotor 7 returns to the axial reference equilibrium position. If the rotor 7 e.g. deviates upward, the axial control magnetic flux generated by a charge of an axial control current through the axial control coil, such as bold solid lines and arrows shown in FIG. 12, is the bias magnetic flux generated by the upper annular permanent magnet 31 and the lower annular permanent magnet 32 is shown like dotted lines and arrows according to FIG. 12. It can be found that the axial air gap magnetic fluxes going between the upper axial stator 51 and the rotor 7 have opposite directions, the axial air gap magnetic fluxes going between the lower axial stator 52 and the rotor 7 have the same direction and the composite air gap magnetic flux between the upper axial stator 51 and the rotor is smaller than the composite air gap magnetic flux between the lower axial stator 52 and the rotor 7. Thus, the composite electromagnetic force FZ applied to the rotor 7 is directed downward to pull the rotor 7 to the axial equilibrium position, due to which a degree of freedom in the axial direction is controlled.

With the above content, the present invention can be realized. Other changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention are to be considered as being within the scope of the present invention.

Claims (9)

claims 1. AC / DC double spherical surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery, an axial stator (5) and a radial stator being placed coaxially outside of the rotor, characterized in that the radial stator is formed in that an upper radial stator (1) and a lower radial stator (8), the yoke sections of which are integrally connected to one another, are arranged coaxially, the upper and lower yoke sections forming a chamber of the radial stator poles (16), and at the upper end of the yoke section of the upper radial one Stator (1) and the lower end of the yoke portion of the lower radial stator (8) are each arranged 3 radial stator poles uniformly along the circumferential direction, and wherein the surface of the inner end of each radial stator pole is a concave spherical surface, and at each radial Stator pole is wound a radial control coil; and wherein in the middle of the rotor (7) a middle cylinder (73) is provided, and wherein at the upper and lower ends there are the same cylinder of the upper end (71) and cylinder of the lower end (75), respectively, and The upper and lower ends of the middle cylinder (73) each have an upper connecting body (72) connected to the cylinder of the upper end (71) and a lower connecting body (74) connected to the lower end cylinder (75), and wherein the Side walls of the cylinder of the upper and lower ends (71, 75) are each a convex spherical surface; and wherein each concave spherical surface at the inner end of the upper and lower radial stator poles is longitudinally corresponding exactly to the convex spherical surface of the cylinder of the upper and lower end (71, 75), and wherein there is an air gap between the concave spherical surface and the convex spherical surface, and wherein the centers of the spheres of the concave spherical surface and the convex spherical surface facing each other overlap; and an axial stator (5) is firmly nested outside the central cylinder (73), and the axial stator (5) is formed by a coaxially arranged disc-shaped upper axial stator and lower axial stator (51, 52) with the same structure, and wherein a disc-shaped magnetic insulating aluminum ring (42) is pressed overlapping between the upper axial stator and the lower axial stator (51, 52), and wherein the inner cavities of the upper axial stator and lower axial stator (51,52) and the magnetic insulating aluminum ring (42) form a chamber of the axial stator (17), and in the chamber of the axial stator (17) an axial control coil (6) closely contacting its inner wall is arranged; and an annular permanent magnet pressed tightly overlapping between the axial stator (5) and the radial stator pole is installed on the upper side of the upper axial stator (51) and the lower side of the lower axial stator (52), and wherein the upper and lower annular ones Permanent magnet have the same structure and are axially magnetized, and the magnetization directions are opposite. 2. AC / DC double spherical surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery according to claim 1, characterized in that the annular permanent magnet generates a bias magnetic flux and controls the rotor (7) for static passive suspension; wherein the axial control coil is turned on with direct current to control an axial degree of freedom of the rotor (7); and wherein the radial control coil is energized to control four radial degrees of freedom of the rotor (7). 3. AC / DC double spherical surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery according to claim 1, characterized in that an outer diameter of the upper axial stator (51), the lower axial stator (52) and the magnetic insulating aluminum ring (42) are the same as each Inner diameter of the chamber of the radial stator poles (16) and in each case on the inner wall of the chamber of the radial stator poles (16) is firmly connected. CH 713 941 A2 4. AC / DC double spherical surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery according to claim 1, characterized in that the upper and lower axial stator (51,52) are each formed in that a large disk (53), a central ring body (54) and a small washer (55) are connected one behind the other in the axial direction, the magnetic insulating aluminum ring (42) being pressed overlapping between the same upper and lower large washer (53), and the inner diameter and the outer diameter of the magnetic insulating aluminum ring (42 ) assigned the same as the inside diameter and the outside diameter of the large disk (53). 5. AC / DC double spherical surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery according to claim 4, characterized in that the inside diameter of the middle ring body (54) is the same as the inside diameter of the large disk (53), the outside diameter of the middle ring body ( 54) is the same as the outside diameter of the small disk (55) but much smaller than the outside diameter of the large disk (53), and the inside diameter of the small disk (55) is smaller than the inside diameter of the large disk (53). 6. AC / DC double spherical surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery according to claim 1, characterized in that the outer diameter of the central cylinder (73) is smaller than the outer diameter of the upper connecting body (72) and the lower connecting body (74), wherein the outer diameter of the upper connecting body (72) and the lower connecting body (74) is the same as the outer diameter of the upper and lower end surfaces of the cylinder of the upper end (71) and the cylinder of the lower end (75). 7. AC / DC double spherical surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery according to claim 1, characterized in that the concave spherical surface and the convex spherical surface have the same thickness in the axial direction, the upper end surface of the 3 upper radial stator poles being flush is aligned with the upper end surface of the yoke portion of the upper radial stator (1), and the lower end surface of the 3 lower radial stator poles is aligned with the lower end surface of the yoke portion of the lower radial stator (8). 8. AC / DC double spherical surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery according to claim 1, characterized in that the upper end surface of the upper radial stator (1) and the upper end surface of the rotor (7) are flush with each other, while the lower End face of the lower radial stator (8) and the lower end face of the rotor (7) are aligned flush with each other. 9. AC / DC double spherical surface mixed magnetic bearing with 5 degrees of freedom for a vehicle flywheel battery according to claim 1, characterized in that outside an annular permanent magnet, a magnetic insulating aluminum ring is placed, which is simultaneously on the outer wall of the annular permanent magnet and the inner wall of a shaft of the chamber of the radial stator (16) is nested tightly. CH 713 941 A2 Drawings: