CN109268391B - Multi-coil axial magnetic bearing for magnetic suspension stable platform - Google Patents
Multi-coil axial magnetic bearing for magnetic suspension stable platform Download PDFInfo
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- CN109268391B CN109268391B CN201811414812.5A CN201811414812A CN109268391B CN 109268391 B CN109268391 B CN 109268391B CN 201811414812 A CN201811414812 A CN 201811414812A CN 109268391 B CN109268391 B CN 109268391B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0459—Details of the magnetic circuit
- F16C32/0468—Details of the magnetic circuit of moving parts of the magnetic circuit, e.g. of the rotor
Abstract
A multi-coil axial magnetic bearing for a magnetic suspension stable platform comprises a stator shaped like a Chinese character 'shan' and a rotor shaped like a Chinese character 'U', wherein the stator shaped like a Chinese character 'shan' is composed of three stator magnetic poles, and a stator bias coil and a stator control coil are wound on the middle stator magnetic pole; the U-shaped rotor is composed of three rotor magnetic poles, wherein a first rotor control coil is wound on the first rotor magnetic pole, and a second rotor control coil is wound on the third rotor magnetic pole; the center line of the magnetic pole of the middle rotor is superposed with the center line of the magnetic pole of the middle stator, eight groups of the stator in the shape of Chinese character shan and the rotor in the shape of Chinese character U are arranged in the circumferential direction, wherein, the four groups of the stator in the shape of Chinese character shan and the rotor in the shape of Chinese character U are arranged above the thrust disc and are arranged along the directions of + X, -X, + Y and-Y; in addition, four groups of the stator shaped like a Chinese character 'shan' and the rotor shaped like a Chinese character 'U' are correspondingly arranged below the thrust disc, and the structure of the invention can greatly reduce the volume and the weight of the magnetic bearing with the existing structure.
Description
Technical Field
The invention relates to a non-contact magnetic suspension bearing, in particular to a split limited-angle multi-coil axial magnetic bearing with large bearing capacity, which can be used as a non-contact support with a limited angle, such as a satellite platform, an airborne inertial stabilization platform and the like, and is particularly suitable for the non-contact support of the magnetic suspension inertial stabilization platform.
Background
The common magnetic suspension bearing is divided into an electromagnetic bias type and a hybrid magnetic suspension bearing with permanent magnet bias and electromagnetic control, wherein the electromagnetic bias type and the hybrid magnetic suspension bearing adopt bias current to generate a bias magnetic field and have the advantages of adjustable rigidity and damping and the like; the permanent magnet is used for replacing current to generate a bias magnetic field, the magnetic field generated by the permanent magnet bears main bearing capacity, the electromagnetic field provides auxiliary adjusting bearing capacity, and the magnetic bearing device has the advantages of low power consumption and the like. The magnetic bearings are classified into radial magnetic bearings and axial magnetic bearings according to the direction of the bearing force. For the existing axial magnetic bearing, the invention patent 200510011272.2 discloses a low-power consumption permanent magnet biased axial magnetic bearing structure, a second air gap is utilized to decouple an electromagnetic magnetic circuit and a permanent magnet magnetic circuit, the invention patent 201510585671.3 discloses an asymmetric permanent magnet biased axial magnetic bearing, a double-U-shaped stator core is adopted, asymmetric annular permanent magnets with different magnetomotive forces in the positive Z direction and the negative Z direction are utilized to generate different static bearing forces in two axial directions, but the axial magnetic bearings in the two structures are both single-degree-of-freedom magnetic bearings, namely, the bearing force in the axial direction can be only generated; the invention patent 200710098748.X discloses a permanent magnet biased axial magnetic bearing, the invention patent 200710098749.4 discloses an axial magnetic bearing for a magnetic suspension flywheel, the two magnetic bearings divide the axial magnetic bearing into four groups of magnetic poles on the circumference along the X and Y directions, and the axial translation freedom degree control and the two radial deflection freedom degree control of a rotor can be realized by controlling the current direction of coils on each group of magnetic poles. However, when the bearing is applied to a large-diameter large-size large-bearing-capacity situation such as an inertial platform for bearing a 500kg camera load, there is a problem that the large platform diameter leads to a large increase in the size of the bearing, and the weight is significantly increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and a split type multi-coil axial magnetic bearing capable of controlling axial translation and radial torsion is provided for mechanisms with limited small rotation angles, such as an inertial stabilization platform.
The technical solution of the invention is as follows: a multi-coil axial magnetic bearing for a magnetic suspension stable platform comprises a stator (1) shaped like a Chinese character 'shan' and a rotor (2) shaped like a Chinese character 'U', wherein the stator shaped like a Chinese character 'shan' is composed of an outer stator magnetic pole, a middle stator magnetic pole and an inner stator magnetic pole, the middle stator magnetic pole is wound with a stator bias coil (31) and a stator control coil (32), and the radial height of the stator bias coil (31) is equal to the radial height of the outer stator magnetic pole and the inner stator magnetic pole of the stator (1) shaped like a Chinese character 'shan' in the radial direction; the U-shaped rotor is composed of a first rotor magnetic pole and a second rotor magnetic pole, wherein the first rotor magnetic pole is wound with a first rotor control coil (4), the second rotor magnetic pole is wound with a second rotor control coil (5), the center line of the U-shaped rotor (2) is superposed with the center line of the middle stator magnetic pole, eight groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U are arranged on the circumference direction, wherein the four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U are arranged above the thrust disc, the other four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U are arranged below the thrust disc, and the four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U above and below the thrust disc are arranged along the directions of + X; axial magnetic air gaps (6) are formed between the four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of U. Bias current is introduced into the stator bias coil (31) to form a bias magnetic field in the axial magnetic air gap (6), control current is introduced into the stator control coil (32) to realize translational control of the thrust disc along the Z direction, and control current is introduced into the first rotor control coil (4) and the second rotor control coil (5) to realize deflection control of the thrust disc along the X direction and the Y direction.
Eight groups of herringbone stators (1) and U-shaped rotors (2) can be arranged above the thrust disc and are uniformly distributed along the circumferential direction, wherein the four groups of herringbone stators (1) and U-shaped rotors (2) are arranged along the directions of + X, -X, + Y and Y; the lower part of the thrust disc can also be composed of eight groups of herringbone stators (1) and U-shaped rotors (2), the eight groups of herringbone stators (1) and the U-shaped rotors (2) above the thrust disc are correspondingly placed, and an axial magnetic air gap (6) is formed between the herringbone stators (1) and the U-shaped rotors (2) above the thrust disc and is unequal to an axial magnetic air gap (6) formed between the herringbone stators (1) and the U-shaped rotors (2) below the thrust disc.
Eight groups of herringbone stators and U-shaped rotors can be arranged above the thrust disc and are uniformly distributed along the circumferential direction, wherein the four groups of herringbone stators and the U-shaped rotors are arranged along the directions of + X, -X, + Y and-Y; the lower part of the thrust disc can also consist of four groups of herringbone stators and U-shaped rotors, and the herringbone stators and the U-shaped rotors are correspondingly arranged along the directions of + X, -X, + Y and-Y above the thrust disc.
The materials of the stator and the rotor are 1J50, 1J22 or electrician pure iron.
The thrust disc is made of non-magnetic materials such as aluminum alloy or titanium alloy.
The principle of the scheme is as follows: the invention forms a bias magnetic field between a stator in the shape of Chinese character 'shan' and a rotor in the shape of Chinese character 'U' by introducing current through a bias coil of the stator in the shape of Chinese character 'shan', and realizes the axial translation control of a thrust disc by controlling the current in a control coil of the stator in the shape of Chinese character 'shan'; and the deflection control of the thrust disc along the radial X direction and the radial Y direction is realized through the current control of the first rotor control coil and the second rotor control coil of the U-shaped rotor. The electromagnetic magnetic circuit of the invention after the bias coil and the control coil of the stator in the shape of Chinese character shan are electrified is as follows: the middle stator magnetic pole, the air gap of the stator in the shape of a Chinese character shan, the middle part of the rotor in the shape of a Chinese character shan, the magnetic poles at the two sides of the rotor in the shape of a Chinese character shan (namely the first rotor magnetic pole and the second rotor magnetic pole), the air gap, the magnetic poles at the two sides of the stator in the shape of a Chinese character shan (namely the outer stator magnetic pole and the inner stator magnetic pole), and the middle stator magnetic pole of the stator in the shape of a Chinese character shan, as shown in fig. 3. The electromagnetic magnetic circuit of the U-shaped rotor after the first rotor control coil is electrified is divided into two parts, wherein the magnetic circuit of the first part is as follows: a first rotor magnetic pole of the U-shaped rotor, an air gap, a magnetic pole corresponding to the stator in the shape of Chinese character shan (i.e. an inner stator magnetic pole), a middle stator magnetic pole of the stator in the shape of Chinese character shan, an air gap and the U-shaped rotor; the second part of the magnetic circuit is as follows: the magnetic circuit of the two parts of the magnetic circuit is shown in figure 4, namely a first rotor magnetic pole of the U-shaped rotor, an air gap, a magnetic pole corresponding to the Y-shaped stator (namely an inner stator magnetic pole), an outer stator magnetic pole of the Y-shaped stator, the air gap and a second rotor magnetic pole of the U-shaped rotor. Similarly, the electromagnetic magnetic circuit of the U-shaped rotor after the control coil of the second rotor is electrified is divided into two parts, and the magnetic circuit of the first part is as follows: a second rotor magnetic pole of the U-shaped rotor, an air gap, a magnetic pole corresponding to the Y-shaped stator (namely an outer stator magnetic pole), a middle stator magnetic pole of the Y-shaped stator, an air gap and the U-shaped rotor; the second part of the magnetic circuit is as follows: a second rotor magnetic pole of the U-shaped rotor, an air gap, a magnetic pole corresponding to the stator (namely an outer stator magnetic pole), an inner stator magnetic pole of the stator, the air gap and a first rotor magnetic pole of the U-shaped rotor. It should be noted that, when the number of turns of the first rotor control coil is the same as that of the second rotor control coil, and the axial gap between the inner stator magnetic pole of the "chevron" shaped stator and the first rotor magnetic pole of the "U" shaped rotor is equal to the axial gap between the outer stator magnetic pole of the "chevron" shaped stator and the second rotor magnetic pole of the "U" shaped rotor, the magnetic flux generated by the first rotor control coil when the first rotor control coil is energized to the second rotor magnetic pole is equal to the magnetic flux generated by the second rotor control coil when the current with the same magnitude and the same direction is energized to the first rotor magnetic pole, and the two magnetic fluxes are opposite to each other, so that the two magnetic fluxes are cancelled out, when the current with the same magnitude and the same direction is simultaneously energized to the first rotor control coil and the second rotor control coil of the "U" shaped rotor, the magnetic path thereof is the same as that in fig. 3, and when the "chevron" U "stator control coil and the first rotor control coil and the second rotor control coil of the The directions are the same), the resultant magnetic circuit is as shown in fig. 5, wherein the solid line represents the magnetic circuit diagram when the stator control coil is energized, and the dotted line represents the magnetic circuit diagram after the first rotor control coil and the second rotor control coil of the rotor are energized simultaneously (the directions of the current magnitudes are the same); fig. 5 shows the situation when the flux generated by the first and second rotor control coils when energized overlaps with the flux generated by the stator control coils when energized, and vice versa.
When the axial magnetic bearing is applied, eight groups of the Chinese character shan-shaped stators (1) and the U-shaped rotors (2) are generally arranged in the circumferential direction, wherein four groups of the Chinese character shan-shaped stators (1) and the U-shaped rotors (2) are arranged above the thrust disc, the other four groups of the Chinese character shan-shaped stators (1) and the U-shaped rotors (2) are arranged below the thrust disc, the four groups of the Chinese character shan-shaped stators (1) and the U-shaped rotors (2) above and below the thrust disc are arranged along the directions of + X, -Y, + Y and Y, as shown in figure 6, bias current is introduced into bias coils in the four groups of the Chinese character shan-shaped stators (1), and forms a bias magnetic field at an air gap between the Chinese character shan-shaped stators and the U-shaped rotors, when the thrust disc generates movement along the axial direction-z, the stator control coil in the stator with the shape of Chinese character shan above the thrust disc is connected with current in the same direction as the bias current, so that the magnetic field in the magnetic air gap between the stator with the shape of Chinese character shan and the rotor with the shape of Chinese character U is enhanced, and the stator control coil in the stator with the shape of Chinese character shan below the thrust disc is connected with current in the direction opposite to the bias current, so that the magnetic field in the magnetic air gap between the stator with the shape of Chinese character shan and the rotor with the shape of Chinese character U is weakened, so that the thrust disc moves in the direction of + z and then returns to the balance position, and vice versa. When the thrust disc deflects along the + x direction, the magnetic gap between the stator in the shape of Chinese character shan above the thrust disc and the rotor in the shape of Chinese character U placed along the + y direction is reduced, the magnetic gap between the stator in the shape of Chinese character shan below the thrust disc and the rotor in the shape of Chinese character U placed along the + y direction is increased, the magnetic gap between the stator in the shape of Chinese character shan above the thrust disc and the rotor in the shape of Chinese character U placed along the-y direction is reduced, at this time, the rotor in the shape of U placed below the thrust disc along the + y direction and the rotor in the shape of U placed above the thrust disc along the-y direction are connected with current, so that the rotor in the shape of U generates attraction to the stator in the shape of Chinese character shan, so that the thrust disc generates a restoring force in the-x direction to achieve equilibrium and vice versa.
The upper part and the lower part of the thrust disc can also be composed of eight groups of herringbone stators and U-shaped rotors which are uniformly distributed along the circumferential direction, as shown in figure 7, wherein the four groups of herringbone stators and U-shaped rotors are arranged along the directions of + X, -X, + Y and-Y; the other four groups of the mountain-shaped stators and the U-shaped rotors are used for bearing the weight of the thrust disc and a load placed on the thrust disc, namely controlling the translation freedom degree of the thrust disc in the Z direction; in order to further reduce the weight, two modes can be realized, one mode is that the axial magnetic air gap between the eight groups of herringbone stators and the U-shaped rotors above the thrust disc is smaller than the axial magnetic air gap between the eight groups of herringbone stators and the U-shaped rotors below the thrust disc during design, and at the moment, the coil current during suspension axial bearing can be reduced. In practical application, considering the axial length and the load structure of the magnetic suspension device, the thrust disc is generally an upper thrust disc and a lower thrust disc, and then the structure of the invention is designed, the eight groups of stators in the shape of the Chinese character 'shan' are placed above or below the lower thrust disc, and the loads such as a camera and the like are placed above the upper thrust disc. The other mode is that the upper part and the lower part of the thrust disc are asymmetric, namely eight groups of herringbone stators and U-shaped rotors are arranged above the thrust disc and are uniformly distributed along the circumference, four groups of herringbone stators and U-shaped rotors are arranged below the thrust disc, and as shown in figure 9, the four groups of herringbone stators and U-shaped rotors below the thrust disc are correspondingly arranged with the herringbone stators and the U-shaped rotors which are arranged along the directions of + X, -X, + Y and-Y above the thrust disc.
Compared with the prior art, the invention has the advantages that: the axial magnetic bearing provided by the invention is provided with the stator in the shape of a Chinese character 'shan' and the rotor in the shape of a Chinese character 'U', the stator and the rotor are both provided with coils, the design of the stator bias coil in the shape of the Chinese character 'shan' greatly improves the utilization space and the utilization rate of the coils, and simultaneously improves the bearing capacity and the deflection control capacity of the bearing.
Drawings
FIG. 1 is an axial cross-sectional view of an axial magnetic bearing of the present invention;
FIG. 2 is a structural diagram of a stator and a rotor of the axial magnetic bearing in the shape of Chinese character shan;
FIG. 3 is a magnetic circuit diagram of the axial magnetic bearing of the present invention after the stator bias coil or the stator control coil is energized;
FIG. 4 is a magnetic circuit diagram of the first rotor control coil of the U-shaped rotor of the axial magnetic bearing of the present invention after being energized;
FIG. 5 is a magnetic circuit diagram of the axial magnetic bearing of the present invention after the stator control coil of the shape of Chinese character shan and the rotor control coil of the shape of Chinese character U are energized simultaneously;
FIG. 6 shows a symmetrical axial magnetic bearing structure of the present invention, in which 4 sets of a stator shaped like a Chinese character shan and a rotor shaped like a U are provided above and below the thrust plate. (ii) a
FIG. 7 is a symmetrical axial magnetic bearing configuration of the present invention, wherein 8 sets of a stator shaped like a Chinese character shan and a rotor shaped like a U are provided above and below the thrust plate;
FIG. 8 is a symmetrical axial magnetic bearing configuration of the present invention in which a total of 8 "chevron" shaped stator groups disposed above and below the thrust disk disposed in the + X, -X, + Y, -Y directions are provided without stator control coils; the other 8 groups of U-shaped rotors are not wound with a first rotor control coil and a second rotor control coil;
FIG. 9 shows an axial magnetic bearing structure of asymmetric structure of the present invention, wherein 8 sets of stator and rotor are above the thrust plate, 4 sets of stator and rotor are below the thrust plate;
FIG. 10 is an axial magnetic bearing structure of asymmetric structure of the present invention, wherein 8 sets of "Y" shaped stators and "U" shaped rotors are arranged above the thrust disc, and the "Y" shaped stators arranged along the + X, -X, + Y, -Y directions are not wound with stator control coils, and the remaining 4 sets of "U" shaped rotors are not wound with first rotor control coils and second rotor control coils; the lower part is provided with 4 groups of 'mountain' -shaped stators and 'U' -shaped rotors which are arranged along the directions of + X, -X, + Y and-Y, and the 'mountain' -shaped stators do not wind stator control coils.
Detailed Description
As shown in fig. 1 and 2, a multi-coil axial magnetic bearing for a magnetically suspended stabilized platform comprises a stator (1) shaped like a Chinese character 'shan' and a rotor (2) shaped like a Chinese character 'U', wherein the stator shaped like a Chinese character 'shan' is composed of an outer stator magnetic pole, a middle stator magnetic pole and an inner stator magnetic pole, wherein the middle stator magnetic pole is wound with a stator bias coil (31) and a stator control coil (32), and the radial height of the stator bias coil (31) is equal to the radial height of the outer stator magnetic pole and the inner stator magnetic pole of the stator (1) shaped like a Chinese character 'shan' in the radial direction; the U-shaped rotor is composed of a first rotor magnetic pole and a second rotor magnetic pole, wherein the first rotor magnetic pole is wound with a first rotor control coil (4), the second rotor magnetic pole is wound with a second rotor control coil (5), the center line of the U-shaped rotor (2) is superposed with the center line of the middle stator magnetic pole, eight groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U are arranged on the circumference direction, wherein the four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U are arranged above the thrust disc, the other four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U are arranged below the thrust disc, and the four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U above and below the thrust disc are arranged along the directions of + X; axial magnetic air gaps (6) are formed between the four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U, as shown in figure 6;
in specific application, certain bias current (usually 1A-3A) is introduced into stator bias coils (31) in four groups of mountain-shaped stators (1) above the thrust disc and stator bias coils (31) in four groups of mountain-shaped stators (1) below the thrust disc so as to generate a bias magnetic field in an axial magnetic air gap between the mountain-shaped stators and a U-shaped rotor, when the thrust disc generates offset along the-Z direction, stator control coils (32) in the four groups of mountain-shaped stators (1) above the thrust disc are introduced with control current in the same direction as that of the stator bias coils (31) so that a magnetic field generated at the axial magnetic air gap is in the same direction as that generated by the stator bias coils (3), and stator control coils (32) in the four groups of mountain-shaped stators (1) below the thrust disc are introduced with control current in the opposite direction to the stator bias coils (31), the magnetic field generated at the axial magnetic air gap is opposite to the direction of the magnetic field generated by the stator bias coil (3), so that the whole thrust disc generates restoring force along the + Z direction. When the thrust disc deflects along the direction + Y, namely the axial magnetic gap between the stator (1) and the rotor (2) which are arranged in the shape of a Chinese character shan and are arranged above the thrust disc along the direction + X and the axial magnetic gap between the stator (1) and the rotor (2) which are arranged in the shape of a Chinese character shan and are arranged below the thrust disc along the direction-X are reduced, the axial magnetic gap between the stator (1) and the rotor (2) which are arranged in the shape of a Chinese character shan and are arranged above the thrust disc along the direction-X and the rotor (1) and the rotor (2) which are arranged in the shape of a Chinese character shan and are arranged below the thrust disc along the direction-X are increased, at the moment, the control coils of the first rotor and the control coils of the second rotor in the rotor (2) which are arranged in the shape of a Chinese character shan and are arranged above the thrust disc along the direction + X and the rotor (2) which is arranged below the thrust disc along the direction-X are all electrified with, the direction of the bias current is the same as that of the bias current introduced into a stator bias coil (31) in a reversed-Y-shaped stator (1) arranged above a thrust disc along + X and a reversed-X-shaped stator (1) arranged below the thrust disc, so that the direction of the magnetic field generated at an axial magnetic air gap by the bias current is opposite to that of the bias current generated at the axial magnetic air gap by the reversed-X-shaped stator (1) arranged above the thrust disc along + X and the stator bias coil (31) of a middle reversed-X-shaped stator (1) arranged below the thrust disc along-X; the U-shaped rotor (2) arranged along X above the thrust disc and the first rotor control coil (4) and the second rotor control coil (5) in the U-shaped rotor (2) arranged along X below the thrust disc are both provided with currents with the same magnitude and the same direction, the direction of a bias current introduced by a stator bias coil (31) in a reversed-X-shaped stator (1) arranged above a thrust disc and a reversed-X-shaped stator (1) arranged below the thrust disc is opposite to that of a bias current introduced by a stator bias coil (31) in the reversed-X-shaped stator (1), so that the magnetic field generated at an axial magnetic air gap is the same as the magnetic field generated by the reversed-X-shaped stator (1) arranged above the thrust disc and the stator bias coil (31) of a reversed-X-shaped stator (1) arranged below the thrust disc, and at the moment, the thrust disc is balanced by a moment in the-Y direction. And vice versa.
The upper part and the lower part of the thrust disc can also be composed of eight groups of herringbone stators and U-shaped rotors which are uniformly distributed along the circumferential direction, as shown in figure 7, wherein the four groups of herringbone stators and U-shaped rotors which are arranged along the directions of + X, -X, + Y and Y above and below the thrust disc control the deflection freedom degree of the thrust disc, namely two deflection freedom degrees of the thrust disc along the directions of X and Y, and the other four groups of herringbone stators and U-shaped rotors above and below the thrust disc control the axial translation freedom degree of the thrust disc; in order to further reduce the weight of the bearing, the middle stator magnetic pole of the four groups of the herringbone stators arranged along the directions of + X, -X, + Y and Y above and below the thrust disc can be only wound with a bias coil without winding a control coil, at the moment, the bias coil can occupy the volume of the original bias coil and the control coil, so that the translational bearing capacity can be greatly improved, and the other four groups of the U-shaped rotors are not wound with a first rotor control coil and a second rotor control coil and are used for bearing the weight of the thrust disc and a load arranged on the thrust disc, namely controlling the translational degree of freedom of the thrust disc along the Z direction, as shown in FIG. 8; in order to further reduce the weight, two modes can be realized, one mode is that the axial magnetic air gap between the eight groups of the herringbone stators and the U-shaped rotors above the thrust disc is smaller than the axial magnetic air gap between the eight groups of the herringbone stators and the U-shaped rotors below the thrust disc during design, and the coil current during suspension axial bearing can be reduced. In practical application, considering the axial length and the load structure of the magnetic suspension device, the thrust disc is generally an upper thrust disc and a lower thrust disc, and then the structure of the invention is designed, the eight groups of stators in the shape of the Chinese character 'shan' are placed above or below the lower thrust disc, and the loads such as a camera and the like are placed above the upper thrust disc. The other mode is that the upper part and the lower part of the thrust disc are in an asymmetric mode, namely, eight groups of herringbone stators and U-shaped rotors are arranged above the thrust disc and are uniformly distributed along the circumference, four groups of herringbone stators and U-shaped rotors are adopted below the thrust disc, as shown in figure 9, the four groups of herringbone stators and U-shaped rotors below the thrust disc are correspondingly arranged with the herringbone stators and the U-shaped rotors above the thrust disc along the directions of + X, -X, + Y and Y, in order to improve the bearing capacity and reduce the weight, the stator control coil is not wound by the Y-shaped stator arranged above the thrust disc along the directions of + X, -X, + Y and-Y, the other 4 groups of U-shaped rotors are not wound with a first rotor control coil and a second rotor control coil; meanwhile, 4 groups of the stator in the shape of the Chinese character 'shan' and the rotor in the shape of the Chinese character 'U' below the thrust disc are placed along the directions of + X, -X, + Y and-Y, and the stator control coil is not wound by the stator in the shape of the Chinese character 'shan' as shown in figure 10.
The stator (1) and the rotor (2) are made of 1J50, 1J22 or electrician pure iron.
The thrust disc is made of aluminum alloy or titanium alloy.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (5)
1. A multi-coil axial magnetic bearing for a magnetic suspension stabilized platform is characterized in that: the stator comprises a stator (1) in a shape of Chinese character 'shan' and a rotor (2) in a shape of Chinese character 'U', wherein the stator in the shape of Chinese character 'shan' is composed of an outer stator magnetic pole, a middle stator magnetic pole and an inner stator magnetic pole, wherein the middle stator magnetic pole is wound with a stator bias coil (31) and a stator control coil (32), and the height of the stator bias coil (31) in the radial direction is equal to the height of the outer stator magnetic pole and the inner stator magnetic pole of the stator (1) in the radial direction; the U-shaped rotor is composed of a first rotor magnetic pole and a second rotor magnetic pole, wherein the first rotor magnetic pole is wound with a first rotor control coil (4), the second rotor magnetic pole is wound with a second rotor control coil (5), the center line of the U-shaped rotor (2) is superposed with the center line of the middle stator magnetic pole, eight groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U are arranged on the circumference direction, wherein the four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U are arranged above the thrust disc, the other four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U are arranged below the thrust disc, and the four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U above and below the thrust disc are arranged along the directions of + X; axial magnetic air gaps (6) are formed between the four groups of the stator (1) in the shape of Chinese character shan and the rotor (2) in the shape of Chinese character U; bias current is introduced into the stator bias coil (31) to form a bias magnetic field in the axial magnetic air gap (6), control current is introduced into the stator control coil (32) to realize translational control of the thrust disc along the Z direction, and control current is introduced into the first rotor control coil (4) and the second rotor control coil (5) to realize deflection control of the thrust disc along the X direction and the Y direction.
2. The axial magnetic bearing of claim 1, wherein: eight groups of herringbone stators (1) and U-shaped rotors (2) can be arranged above the thrust disc and are uniformly distributed along the circumferential direction, wherein the four groups of herringbone stators (1) and U-shaped rotors (2) are arranged along the directions of + X, -X, + Y and Y; the lower part of the thrust disc can also be composed of eight groups of herringbone stators (1) and U-shaped rotors (2), the eight groups of herringbone stators (1) and the U-shaped rotors (2) above the thrust disc are correspondingly placed, and an axial magnetic air gap (6) is formed between the herringbone stators (1) and the U-shaped rotors (2) above the thrust disc and is unequal to an axial magnetic air gap (6) formed between the herringbone stators (1) and the U-shaped rotors (2) below the thrust disc.
3. The axial magnetic bearing of claim 1, wherein: eight groups of herringbone stators (1) and U-shaped rotors (2) can be arranged above the thrust disc and are uniformly distributed along the circumferential direction, wherein the four groups of herringbone stators (1) and U-shaped rotors (2) are arranged along the directions of + X, -X, + Y and Y; the lower part of the thrust disc can also consist of four groups of herringbone stators (1) and U-shaped rotors (2), and the herringbone stators (1) and the U-shaped rotors (2) which are arranged along the directions of + X, -X, + Y and Y above the thrust disc are correspondingly arranged.
4. The axial magnetic bearing of claim 1, wherein: the stator (1) and the rotor (2) are made of 1J50, 1J22 or electrician pure iron.
5. The axial magnetic bearing of claim 1, wherein: the thrust disc is made of aluminum alloy or titanium alloy.
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| CN201811414812.5A CN109268391B (en) | 2018-11-26 | 2018-11-26 | Multi-coil axial magnetic bearing for magnetic suspension stable platform |
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| CN201811414812.5A CN109268391B (en) | 2018-11-26 | 2018-11-26 | Multi-coil axial magnetic bearing for magnetic suspension stable platform |
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| CN109268391B true CN109268391B (en) | 2020-01-14 |
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| CN112727921B (en) * | 2020-12-23 | 2021-09-14 | 北京航空航天大学 | Super-stable super-static single-shaft rotary table supported by active magnetic suspension bearing |
| CN113323963B (en) | 2021-04-22 | 2022-03-11 | 东南大学 | Magnetic bearing of stator permanent magnet motor with magnetic pole bypass and bias force adjusting method thereof |
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| EP3135933B1 (en) * | 2015-08-25 | 2019-05-01 | ReinHeart GmbH | Active magnetic bearing |
| CN106763184B (en) * | 2017-02-15 | 2019-06-28 | 江苏大学 | A kind of sextupole radial-axial hybrid magnetic bearing |
| CN107448474B (en) * | 2017-07-27 | 2019-02-05 | 江苏大学 | A kind of vehicle-mounted flying wheel battery five degree of freedom hybrid magnetic bearing |
| CN108050156A (en) * | 2017-11-14 | 2018-05-18 | 江苏大学 | A kind of sextupole hybrid magnetic bearing |
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