CH713941B1 - AC / DC dual ball surface mixed magnetic bearing with five degrees of freedom for a vehicle flywheel battery. - Google Patents

Abstract

The present invention discloses a five degree of freedom AC / DC dual ball surface mixed magnetic bearing for a vehicle flywheel battery, wherein the radial stator (1, 8) is formed by having an upper radial stator (1) and a lower radial stator (8), whose yoke portions are integrally connected to each other, are arranged coaxially, and wherein at the upper end of the yoke portion of the upper radial stator (1) and the lower end of the yoke portion of the lower radial stator (8) each have three radial stator poles (11, 12, 13, 81, 82, 83) are arranged uniformly along the circumferential direction, and wherein the surface of the inner end of each radial stator pole (11, 12, 13, 81, 82, 83) is a concave spherical surface (211, 811), respectively at the upper and lower end of the middle cylinder (73), one upper connecting body (72) connected to the cylinder of the upper end (71) and one connected to the cylinder of the lower end (75); a second connecting body (74) are provided, and wherein the side walls of the cylinder of the upper and lower ends (71, 75) are each a convex spherical surface (711, 751); and wherein each concave spherical surface (211, 811) longitudinally corresponding to exactly the convex spherical surface (711, 751) faces, and outside of the middle cylinder (73) of the axial stator (5) is interleaved, and wherein at the top of the upper axial Stators (51) and the underside of the lower axial stator (52) are each an upper, and lower annular permanent magnet (31, 32) is installed. For the opposite surfaces of the stator (1, 8) and the rotor (7), a spherical surface structure is used in each case. 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 non-mechanical contact type magnetic suspension bearing, and more particularly to an AC7DC five-speed mixed magnetic bearing which is suitable for magnetic suspension support of a vehicle flywheel battery for electric vehicles.

Background Art At present, the performance of the vehicle battery is a major problem that restricts the development of electric vehicles. Using the flywheel's magnetic suspension support and flywheel inertia, the vehicle flywheel battery realizes energy storage and has good charging efficiency, high specific power, small mass, no fouling and long life, and other benefits. The existing flywheel batteries typically use a solenoid permanent magnet mixed magnetic bearing as support for the flywheel rotor to realize a five-speed suspension in the radial and axial directions. The stator of the mixed magnetic bearing is formed as a cylindrical structure, and the associated rotor is also formed cylindrical. Although the magnetic bearing of the structure can ensure stable flywheel battery suspension operation, a gyroscopic effect is inevitably caused when the flywheel battery is disturbed by the outside environment. When a vehicle is started, stopped suddenly, and so on, the vehicle flywheel battery is caused to exert a very high gyroscopic moment 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 this the currently existing magnetic bearing structure very difficult to avoid the occurrence of a gyroscopic effect. In addition, in the present existing magnetic bearings, the design of the axial drive usually realized in that on the rotor a thrust washer is additionally installed, with the design not only the mass of the rotor is increased, but when running the flywheel battery at a high speed is also the Increased friction and air resistance loss of the axis of rotation; In addition, the thrust washer will increase the linear peripheral speed of the rotor, thereby limiting the maximum speed of the rotor.

It is an object of the present invention to provide a five degree of freedom AC / DC double-spherical surface mixed magnetic bearing for the problems of existing flywheel batteries having an increased mass of the rotor and a susceptibility to the occurrence of a gyroscopic effect to provide a vehicle flywheel battery having a compact structure, a small volume, a small mass, and a gyroscopic effect inhibiting ability.

An AC7DC dual-sphere mixed-magnetic bearing with five degrees of freedom for a vehicle flywheel battery according to the present invention is realized by the technical solution according to claim 1: outside a rotor, an axial stator and a radial stator are coaxially mounted, wherein the radial stator has an upper radial Stator having an upper yoke portion and a lower radial stator having a lower yoke portion and is formed by the upper radial stator and the lower radial stator whose upper and lower yoke portions are integrally connected to each other, are coaxially arranged, the upper and lower Jochabschnitt form a first chamber, and wherein at the upper end of the upper yoke portion of the upper radial stator and the lower end of the lower yoke portion of the lower radial stator three radial stator poles are arranged uniformly along the circumferential direction, wherein the Oberflä each of the radial stator pole is a concave spherical surface, a radial control coil being wound on each radial stator pole, with a center cylinder being provided in the center of the rotor, with an equal cylinder at the top and bottom of the middle cylinder of the upper end and cylinders of the lower end are provided, wherein at the upper and lower ends of the middle cylinder respectively connected to the cylinder of the upper end upper connecting body and a cylinder connected to the lower end lower connecting body are provided, wherein the side walls of the cylinder each of the upper and lower ends is a convex spherical surface, each concave spherical surface at the inner end of the upper and lower radial stator poles facing longitudinally correspondingly precisely to the convex spherical surface of the upper and lower end cylinder, between the concave spherical surface and the convex spherical surface Sphere surface is an air gap, wherein the ball centers of precisely facing concave spherical surface and convex spherical surface overlap, outside of the middle cylinder of the axial stator is firmly nested, wherein the axial stator by a coaxially arranged disc-shaped upper axial stator and lower axial stator with the same a mechanical structure is formed, wherein between the upper axial stator and the lower axial stator, a disk-shaped Magnetisolieraluminiumring is pressed overlapping, wherein an inner cavities of the upper axial stator and lower axial stator and the disk-shaped Magnetisolieraluminiumsring form a second chamber, and wherein in the second chamber their inner wall contacting axial control coil is arranged, wherein at the top of the upper axial stator and the underside of the lower axial stator in each case one between the axial stator and the radial stator pole In the upper and lower annular permanent magnets, the upper and lower annular permanent magnets have the same mechanical structure and are axially magnetized, respectively, and the magnetization directions are opposite.

Compared with the prior art, the present invention has the following advantages: 1. A spherical surface structure is used for the opposed surfaces of the stator and the rotor of the double-spherical mixed magnetic bearing according to the present invention, thereby effectively reducing the axial size of the magnetic bearing become; upon deflection or displacement of the rotor of the magnetic bearing, the electromagnetic force is directed to the ball center of the rotor to reduce a disturbing 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 occurrence of the gyroscopic effect, and the spherical surface structure promotes multi-dimensional movement and spatial positioning and work, moreover, the distribution of the magnetic field of the air gap by the spherical surface structure becomes more uniform and symmetrical 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 utilized, and the permanent magnets are respectively installed in the upper chamber of the radial stator and the lower chamber of the radial stator, thereby reducing the axial size of the magnetic bearing and reducing the gyroscopic the effect of the rotor is suppressed to the limit, moreover, the structure becomes more compact. 3. With respect to the axial control, the present invention uses a rotor structure without thrust washer, thereby reducing the mass of the rotor, moreover, the friction and air resistance loss of the rotation axis is reduced, which is conducive to a high-speed operation of the rotor, and the axial control accuracy will be 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 a five-degree-of-freedom integrated structure with a high degree of integration to shorten the length of the axle, reduce flywheel battery volume, and save material.

Short description of the drawing [0006]

Fig. 1 is a sectional view of the internal structure of the present invention;

Fig. 2 is a plan view of the present invention;

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

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

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

Fig. 4;

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

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

Fig. 8 shows a front view of the mounting structure of a radial stator, a radial control coil, a axia len 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 is a principle diagram of the radial two-degree-of-degree compensation control of the present invention;

Fig. 11 is a principle diagram of the radial rotating two-degree-of-degree 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.

Detailed Description Referring to Figs. 1 and 2, in the middle of the present invention, a rotor 7 is disposed, outside of the rotor 7, an axial stator 5 and a radial stator are coaxially mounted.

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

The upper end surface of the upper radial stator 1 and the upper end surface of the rotor 7 are aligned 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 aligned flush with each other.

In the first chamber 16, at the upper end of the yoke portion of the upper radial stator 1 and lower end of the yoke portion of the lower radial stator 8, three radial stator poles are uniformly arranged respectively along the circumferential direction, each having three upper radial 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 three lower radial stator poles 81, 82, 83 are completely identical to each other, with the top and bottom projections overlapping. The upper end surface of the three upper radial stator poles 11, 12, 13 is aligned flush with the upper end surface of the yoke portion of the upper radial stator 1, the lower end surface of the three lower radial stator poles 81, 82, 83 being flush with the lower end surface of the yoke portion of FIG lower radial stator 8 is aligned. At each radial stator pole respectively radial control coils are wound, which respectively correspond to the upper radial control coil 21,22, 23 and the lower radial coil 91, 92, 93, wherein the six completely identical radial control coils corresponding to each other at 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 in each case, wherein the surface of the pole piece is formed 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 exemplified: 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 in the axial direction structure, wherein in the middle of a middle cylinder 73 is provided, and wherein at the upper and lower end in each case an identical hollow cylinder is provided, which 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, there are respectively disposed 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. 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, wherein the side wall of the cylinder of the upper end 71 is an upper convex spherical surface 711 and the side wall of the cylinder of the lower End 75 is about 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, wherein the outer diameter of the middle cylinder 73 is smaller than the outer diameter of the upper connecting body 72 and the lower connecting body 74, and wherein the outer diameter of the upper connecting body 72nd 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 three upper radial stator poles 11, 12, 13 and the three lower radial stator poles 81, 82, 83 is longitudinally in the radial direction corresponding to exactly the convex spherical surface of the cylinder facing the upper end 71 and the cylinder of the lower end 75 of the rotor 7, between the concave spherical surface and the convex spherical surface is maintained a radial air gap of 0.5 mm, and the concave spherical surface and the convex spherical surface have a same axial length in the axial direction. When the rotor 7 is at an equilibrium position, the ball 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 ball 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, explanation will be given merely 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 the upper convex spherical surface 711 in the radial direction 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 the lower convex spherical surface 751 of the rotor 7 in the radial direction, 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 disc-shaped axial stator 5 is fixed in a center located in the first chamber 16, wherein the axial stator 5 in the axial direction between the upper radial control coils 21, 22, 23 and the lower radial coils 91, 92, 93 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, wherein the upper axial stator 51 and the lower axial stator 52 have a same structure, are both disc-shaped and along the axial direction of the central cylinder 73 longitudinally are arranged coaxially. Between the upper axial stator 51 and the lower axial stator 52, a disc-shaped magnetic insulating aluminum ring 42 is pressed tightly overlapped, wherein an outer diameter of the upper axial stator 51, the lower axial stator 52 and the Magnetisolieraluminiumsring 42 respectively equal to the inner diameter of the first chamber 16 and is firmly connected to the inner wall of the first chamber 16. The inner cavities of the upper axial stator 51, the lower axial stator 52 and the Magnetisolieraluminiumsring 42 form a second chamber 17, wherein in the second chamber 17, an axial control coil 6 is coaxially fixed by a coil holder, and wherein the axial control coil 6, the inner wall of the the second chamber 17 are closely contacted and they are placed together outside the middle cylinder 73, and wherein between them and the middle cylinder 73, a gap is held. 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 in a row. The magneto-insulating aluminum ring 42 is pressed overlappingly between the same upper and lower large disks 53, with the inner diameter and outer diameter of the magneto-insulating aluminum ring 42 being equal to the inner diameter and the outer diameter of the large disk 53, respectively. An end face of the large disk 53 is connected to the small disk 55 through the middle ring body 54, the inner diameter of the middle ring body 54 being the same as the inner diameter of the large disk 53, and the outer diameter of the middle ring body 54 being the same as the outer diameter of the small disk 53 Disk 55, but much smaller than the outer diameter of the large disk 53, and wherein the inner diameter of the small disk 55 is smaller than the inner diameter of the large disk 53, this is a step between the outer wall of the small disk 55 and the outer wall of the large disk 53 formed so that an axial gap exists. The axial distance of the upper end surface of the small disc 55 of the upper axial stator 51 to the upper radial stator poles 11,12,13 is equal to the axial distance of the lower end surface of the small disc 55 of the lower axial stator 52 to the lower radial stator poles. The axial control coil 6 tightly contacts the inner walls of the two central annular bodies 54 and the two large disks 53, wherein an axial control magnetic field can be generated in the interior of the annular body 54 when the axial control coil 6 is turned on.

As shown in Fig. 7, in the axial direction, an axial air gap of 0.5 mm between the upper end surface of the small plate 55 of the upper axial stator 51 and the lower end surface of the upper connecting body 72 of the rotor 7 is held, when the rotor 7 is at 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. Also, in the axial direction, there is an axial air gap of 0.5 mm between the lower end surface of the small disk 55 of the lower axial stator 52 and the upper end surface of the lower joint 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 joint body 74 of the rotor 7.

As shown in Fig. 8 and 1, an annular permanent magnet is installed at the top 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, in each case an upper annular permanent magnet 31st and a lower ring-shaped permanent magnet 32, wherein the upper ring-shaped permanent magnet 31 and the lower ring-shaped permanent magnet 32 have the same structure and are each made of a high-performance rare earth material - neodymium-iron-boron - and axially magnetized, and the upper one annular permanent magnet 31 and the lower annular permanent magnet 32 have an opposite direction of magnetization, and wherein the S-poles of the annular permanent magnet are opposed to each other. The annular permanent magnet is tightly pressed between the axial stator 5 and the radial stator pole, the upper annular permanent magnet 31 being overlapped between the large disc 53 of the upper axial stator 51 and the upper radial stator poles 11, 12, 13, and wherein lower annular permanent magnet 32 is overlapped between the lower axial stator 52 and the lower radial stator poles 81, 82, 83 is pressed. 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 disc 55, thereby ensuring that a certain radial gap between the annular permanent magnet and the central ring body 54 and the small disc 55 of the axial Stators 5 is held to ensure that the axial magnetic circuit in the axial stator 5 is not affected by the annular permanent magnet.

Outside of an annular permanent magnet, a Magnetisolieraluminiumring is placed, which is at the same time firmly interleaved on the outer wall of the annular permanent magnet and the inner wall of a shaft of the first chamber 16. Outside the upper annular permanent magnet 31, an upper Magnetisolieraluminiumring 41 is placed, while outside the lower annular permanent magnet 32, a lower Magnetisolieraluminiumring 43 is placed, the upper Magnetisolieraluminiumring 41 and the lower Magnetisolieraluminiumring 43 have a completely same structure, and whose axial height is the same that of the upper annular permanent magnet 31 and the lower annular permanent magnet 32 is. The upper magnetic insulating aluminum ring 41 and the lower magnetic insulating aluminum ring 43 are first press-fitted to the outer wall of the upper annular permanent magnet 31 and the lower annular permanent magnet 32, respectively, and then closely bonded to the inner wall of the shaft of the first chamber 16 by cold pressure welding. Between the annular permanent magnet and the Magnetisolieraluminiumring and the upper radial control coils 21,22, 23 and the lower radial coils 91, 92, 93 there is no contact or no interference.

In operation of the present invention, a static passive suspension, a two degree of freedom radial balance, a two degree torsional radial torsional balance and a single degree of axial balance can be realized. With respect to the axial control, the axial control coil is turned on with direct current so as to form an electromagnet with the axial stator, and by varying and controlling the magnitude and direction of the direct current, the magnitude and direction of the force acting on the rotor are changed in the axial direction. to realize an axial single degree of freedom control. With respect to the radial control, the three-phase alternating current radial control coil arranged at upper and lower groups of three-magnetic-pole radial ball surface stators is turned on, and by varying the magnitude of the current of the radial control coil, accurate four-degree-of-freedom control in the radial direction is realized. Details are as follows: Implementation 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 magnets 32 are shown as dotted line and arrow in FIG. Pol of the upper annular permanent magnet 31 passes through the upper annular permanent magnet 31 generated bias magnetic flux at the upper radial stator pole 11 and then successively at 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, and finally returns to the S-pole of the upper permanent magnet 31. Similarly, 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 connection body 74 of FIG Rotor 7, the axial air gap and the lower axial stator 52 of the axial stator 5 over and ends at the end to the S-pole of the lower annular permanent magnet 32 back. When the rotor 7 is at a middle equilibrium position, the center axis of the rotor 7 and the axial center axis of the magnetic bearing overlap, in the radial direction the air gap magnetic fluxes are between the convex spherical surfaces of the upper end cylinder 71 and the lower end cylinder 75 of FIG Rotor 7 and the concave spherical surfaces of the upper radial stator pole 11 and the lower radial stator pole 81 are completely identical with each other, due to which an electromagnetic force exerted on the rotor 7 in the radial direction is balanced to realize a radial 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 applied to the rotor 7 in the axial direction is balanced , due to which an axial stable suspension of the rotor 7 is realized.

Realization of a radial degree of two-degree balance: see FIG. 10, when the rotor 7 is disturbed in the radial degree of two-degree 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 turned on, and the generated single magnetic flux is directed in a direction away from the positional deviation, thereby generating a corresponding magnetic suspension force of the radial control 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 respectively turned on, the generated control magnetic flux 10 is shown by solid 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 by dashed lines and arrows according to FIG. 10 passing through the interior of the upper radial stator poles 11; 13 and the lower radial stator poles 81, 83 passing 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 a same direction so that the total magnetic flux is amplified, thus increasing the radial single magnetic flux in the backward direction of the Y axis, 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 Torion-Zweifreiheitsgrad Equilibrium: see Fig. 11, when the rotor 7 is disturbed in the radial torsional two 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 turned on, and the generated single magnetic flux is directed in a direction away from the positional deviation, thereby generating a torque such that the rotor 7 returns to the radial equilibrium position. It is assumed that the rotor 7 under disturbance has a torsion in the forward direction of the Y-axis, the torsion angle is Ox, the control magnetic flux generated after the connection of the upper radial control coils 21, 22, 23 by bold solid lines and arrows according to FIG. 11 is shown and the generated by the upper annular permanent magnet 31 and the lower ring-shaped permanent magnet 32 bias magnetic flux is shown by dashed lines and arrows according to FIG. 11. It can be found that the bias magnetic flux and the control magnetic flux in the upper radial stator poles 21, 23 have directions opposite to each other 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 top 22 have a 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 have the through the inside of the lower radial stator poles 81, 83, the bias magnetic flux and control magnetic flux pass an identical direction, and the total magnetic flux passing through the lower radial stator poles 81, 83 is amplified, while the bias magnetic flux and the control magnetic flux passing through the lower radial stator pole 82 have directions opposite to each other 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 torsion torque is applied to the rotor 7, so that he returns to the equilibrium position.

Realization of an axial single degree of freedom active control: see Fig. 12, the axial control coil 6 is switched to DC, when the rotor 7 in the axial direction has a position deviation, the size and the direction of the current are changed by a variation of the direct current 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 is at the axial reference equilibrium position returns. If the rotor 7 is e.g. is deviated upward, the axial control magnetic flux, which is generated by a charge of an axial control current through the axial control coil 6, by bold solid lines and arrows shown in FIG. 12, which generated by the upper annular permanent magnet 31 and the lower annular permanent magnet 32 Bias bias flux is shown by dotted lines and arrows in FIG. In this case, it can be found that the axial air gap magnetic flux passing between the upper axial stator 51 and the rotor 7 have directions opposite to each other, having the same axial direction between the axial axial stator 52 and the rotor 7 axial air gap magnetic flux and the composite air gap magnetic flux between the upper axial stator 51 and the rotor 7 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.

DESCRIPTION OF SYMBOLS [0025] 1 Upper radial stator 5 Axial stator 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 axial stator 21, 22, 23 Upper radial control coil 31 Upper annular permanent magnet 32 Lower annular permanent magnet 41 Upper magnetic insulating aluminum ring 42 Magnetic insulating aluminum ring 43 Lower magnetic insulating aluminum ring 51 Upper axial stator 52 Lower axial stator 53 Large disk 54 Middle annular body 55 Small disk 71 Cylinder of upper end 72 Upper connecting body 73 Middle cylinder 74 Lower connecting body 75. Cylinder of lower end 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

Claims (9)

claims A five degree of freedom AC / DC double ball surface mixed magnetic bearing for a vehicle flywheel battery comprising: a rotor (7) an axial stator (5); and - a radial stator (1,8), outside of the rotor (7) of the axial stator (5) and the radial stator (1,8) are coaxially mounted, characterized in that the radial stator (1, 8) has a upper radial stator (1) having an upper yoke portion and a lower radial stator (8) having a lower yoke portion and being formed by the upper radial stator (1) and the lower radial stator (8) whose upper and lower yoke portions are integrally connected to each other coaxially, wherein the upper and lower yoke portion form a first chamber (16), wherein at the upper end of the upper yoke portion of the upper radial stator (1) and the lower end of the lower yoke portion of the lower radial stator ( 8) each having three radial stator poles (11,12,13, 81,82, 83) are arranged uniformly along the circumferential direction, wherein the surface of the inner end of each radial stator pole (11, 12, 13, 81, 82, 83) respectively a ko nkave spherical surface (211,811), wherein at each radial stator pole (11,12,13,81,82,83) a radial control coil (21,22,23, 91,92, 93) is wound, wherein in the center of the rotor (7) a middle cylinder (73) is provided, wherein at the upper and lower ends of the central cylinder (73) each have a same cylinder of the upper end (71) and cylinders of the lower end (75) are provided, wherein the upper and lower 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 provided at the end of the middle cylinder (73), the side walls of the cylinder of the upper and lower ends (71, 75) are each a convex spherical surface (711, 751), each concave spherical surface (211, 811) at the inner end of the upper and lower radial stator poles (11, 12, 13, 81, 82, 83 ) longitudinally corresponding to exactly the convex spherical surface (711,751) of the cylinder de s is an air gap between the concave spherical surface (211, 811) and the convex spherical surface (711, 751), the ball centers of the precisely facing concave spherical surface (211, 811) and convex spherical surface (711 , 751) overlap each other, outside of the middle cylinder (73) of the axial stator (5) is firmly nested, wherein the axial stator (5) by a coaxially arranged disc-shaped upper axial stator and lower axial stator (51,52) with the same a mechanical structure is formed, wherein between the upper axial stator and the lower axial stator (51, 52) a disc-shaped Magnetisolieraluminiumring (42) is pressed overlapping, wherein the inner cavities of the upper axial stator and lower axial stator (51,52) and the disc-shaped Magnetisolieraluminiumsring (42) form a second chamber (17), wherein in the second chamber (17) an inner wall contacting axial St is arranged at the top of the upper axial stator (51) and the underside of the lower axial stator (52) each between the axial stator (5) and the radial stator pole (11, 12, 13, 81, 82, 83) overlapped with upper and lower annular permanent magnets (31, 32) is installed, said upper and lower annular permanent magnets (31, 32) having a same mechanical structure and each being axially magnetized, and said magnetization directions being opposite , 2. A five-degree AC7DC double ball surface mixed magnetic bearing for a vehicle flywheel battery according to claim 1, characterized in that the upper or lower annular permanent magnet (31, 32) generates a bias magnetic flux to control the static passive suspension rotor (7) ; wherein the axial control coil (6) is connectable with direct current to control an axial degree of freedom of the rotor (7); and wherein the radial control coil (21, 22, 23, 91, 92, 93) is connectable with alternating current in order to control four radial degrees of freedom of the rotor (7). The AC7DC dual-sphere mixed-magnetic bearing with five 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 disk-shaped magnetic insulating aluminum ring (42) are each the same as the inner diameter the first chamber (16) and wherein the upper axial stator (51), the lower axial stator (52) and the disk-shaped Magnetisolieraluminiumring (42) are each firmly connected to the inner wall of the first chamber (16). 4. AC7DC dual-sphere mixed-magnetic bearing with five degrees of freedom for a vehicle flywheel battery according to claim 1, characterized in that the upper and lower axial stator (51, 52) respectively formed by a first disc (53), a middle annular body (54 ) and a second disk (55) smaller than the first disk (53) are connected in series in the axial direction, the disk-shaped magnetic insulating aluminum ring (42) being overlapped between the same upper and lower first disks (53), and wherein the inner diameter and the outer diameter of the disc-shaped magnetic insulating aluminum ring (42) are the same as the inner diameter and the outer diameter of the first disc (53). 5. A five-degree AC7DC dual-sphere mixed magnetic bearing for a vehicle flywheel battery according to claim 4, characterized in that the inner diameter of the central ring body (54) is the same as the inner diameter of the first disc (53), the outer diameter of the middle ring body (54). is the same as the outer diameter of the second disc (55), but much smaller than the outer diameter of the first disc (53), and wherein the inner diameter of the second disc (55) is smaller than the inner diameter of the first disc (53). 6. AC7DC dual-sphere mixed-magnetic bearing with five 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 equal to the outer diameter of the upper and lower end surface of the cylinder of the upper end (71) and the cylinder of the lower end (75). An AC7DC dual-sphere mixed-magnetic bearing with five degrees of freedom for a vehicle flywheel battery according to claim 1, characterized in that the concave spherical surface (211, 811) and the convex spherical surface (711, 751) have a same axial length in the axial direction upper end surface of the three upper radial stator poles (11, 12, 13) is aligned flush with the upper end surface of the upper yoke portion of the upper radial stator (1), and the lower end surface of the three lower radial (81, 82, 83) Stator poles is aligned flush with the lower end surface of the lower yoke portion of the lower radial stator (8). 8. AC7DC dual-sphere mixed-magnetic bearing with five 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 aligned flush with each other, while the lower end surface of lower radial stator (8) and the lower end surface of the rotor (7) are aligned flush with each other. 9. AC7DC dual-sphere mixed-magnetic bearing with five degrees of freedom for a vehicle flywheel battery according to claim 1, characterized in that outside the upper or lower annular permanent magnet (31,32) an upper or lower Magnetisolieraluminiumring (41,43) is placed, which at the same time is firmly interleaved on the outer wall of the upper or lower annular permanent magnet (31, 32) and the inner wall of a shaft of the first chamber (16).