CN109681528B - Multi-coil axial magnetic bearing for precision tracking support - Google Patents
Multi-coil axial magnetic bearing for precision tracking support Download PDFInfo
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- CN109681528B CN109681528B CN201910125380.4A CN201910125380A CN109681528B CN 109681528 B CN109681528 B CN 109681528B CN 201910125380 A CN201910125380 A CN 201910125380A CN 109681528 B CN109681528 B CN 109681528B
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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
- F16C32/0444—Details of devices to control the actuation of the electromagnets
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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
- F16C32/0444—Details of devices to control the actuation of the electromagnets
- F16C32/0451—Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control
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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
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/0476—Active magnetic bearings for rotary movement with active support of one degree of freedom, e.g. axial magnetic bearings
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
A multi-coil axial magnetic bearing for a precise tracking bracket comprises a T-shaped stator and a U-shaped rotor, wherein a stator bias coil and a stator control coil are wound on a magnetic pole of the middle stator of the T-shaped stator; the U-shaped rotor is composed of two rotor magnetic poles, wherein a first rotor magnetic pole is wound with a first rotor bias coil and a first rotor control coil, and a second rotor magnetic pole is wound with a second rotor bias coil and a second rotor control coil; the central line of the U-shaped rotor is superposed with the central line of the magnetic pole of the middle stator, eight groups of T-shaped stators and U-shaped rotors are arranged in the circumferential direction, wherein the four groups of T-shaped stators and U-shaped rotors are arranged above the thrust disc and are arranged along the directions of + X, -X, + Y and-Y; in addition, four groups of T-shaped stators and U-shaped rotors are correspondingly arranged below the thrust disc, and the structure of the magnetic bearing 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 large-bearing-capacity split limited-corner axial magnetic bearing which can be used as a non-contact support with a limited corner, such as a satellite platform, an airborne inertial stabilization platform and the like, and is particularly suitable for a non-contact support of a precision tracking support for a navigation system.
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 method is applied to a precision tracking support bearing a camera load of 30kg, namely, a large-diameter large-size large-bearing-capacity occasion, the problem that the bearing size is greatly increased and the weight is remarkably increased due to the large platform diameter exists.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the split type axial magnetic bearing capable of controlling axial translation and radial torsion is provided for a mechanism with a limited small corner, such as a precise tracking support.
The technical solution of the invention is as follows: an axial magnetic bearing for a precision tracking bracket comprises a T-shaped stator 1 and a U-shaped rotor 2, wherein a stator bias coil 31 and a stator control coil 32 are wound on a middle stator magnetic pole of the T-shaped stator 1; the "U" shaped rotor 2 is composed of a first rotor magnetic pole wound with a first rotor bias coil 41 and a first rotor control coil 42 and a second rotor magnetic pole wound with a second rotor bias coil 51 and a second rotor control coil 52, the height of the first rotor bias coil 41 and the second rotor bias coil 51 in the radial direction is equal to the height of the middle rotor magnetic pole of the "U" shaped rotor 2 in the radial direction; the central line of the U-shaped rotor 2 is superposed with the central line of the magnetic pole of the middle stator, eight groups of T-shaped stators 1 and U-shaped rotors 2 are arranged on the circumferential direction, wherein four groups of T-shaped stators 1 and U-shaped rotors 2 are arranged above the thrust disc, the other four groups of T-shaped stators 1 and U-shaped rotors 2 are arranged below the thrust disc, and the four groups of T-shaped stators 1 and U-shaped rotors 2 above and below the thrust disc are arranged along the directions of + X, -X, + Y and-Y; an axial magnetic air gap 6 is formed between each group of T-shaped stators 1 and U-shaped rotors 2. Bias currents are supplied to the stator bias coil 31, the first rotor bias coil 41 and the second rotor bias coil 51 to form a bias magnetic field in the axial magnetic air gap 6, control currents are supplied to the stator control coil 32 to achieve translational control of the thrust disc along the Z direction, and control currents are supplied to the first rotor control coil 42 and the second rotor control coil 52 to achieve deflection control of the thrust disc along the X direction and the Y direction.
Eight groups of T-shaped stators 1 and U-shaped rotors 2 are arranged above the thrust disc and are uniformly distributed along the circumferential direction, wherein the four groups of T-shaped stators 1 and U-shaped rotors 2 are arranged along the directions of + X, -X, + Y and Y; the lower portion of the thrust disc is composed of eight groups of T-shaped stators 1 and U-shaped rotors 2, the eight groups of T-shaped stators 1 and the U-shaped rotors 2 are correspondingly arranged above the thrust disc, and axial magnetic air gaps 6 are formed between the T-shaped stators 1 and the U-shaped rotors 2 above the thrust disc and are unequal to axial magnetic air gaps 6 formed between the T-shaped stators 1 and the U-shaped rotors 2 below the thrust disc.
Eight groups of T-shaped 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 T-shaped 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 is composed of four groups of T-shaped stators 1 and U-shaped rotors 2, and the T-shaped stators 1 and the U-shaped rotors 2 are correspondingly arranged on the upper part of the thrust disc along the directions of + X, -X, + Y and Y.
The T-shaped stator 1 and the U-shaped rotor 2 are made of 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 the T-shaped stator 1 and the U-shaped rotor 2 by the current of the bias coil of the T-shaped stator 1 and the bias coil of the first rotor and the bias coil of the second rotor of the U-shaped rotor 2, and realizes the axial translation control of the thrust disc by the current control in the control coil of the T-shaped stator 1; 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 2. The electromagnetic magnetic circuit of the invention after the bias coil and the control coil of the T-shaped stator 1 are electrified is as follows: the middle stator magnetic pole of the T-shaped stator 1, the air gap, the middle magnetic conduction part of the U-shaped rotor 2, the magnetic poles on both sides of the U-shaped rotor 2 (i.e., the first rotor magnetic pole and the second rotor magnetic pole), the air gap, the magnetic conduction parts on both sides of the T-shaped stator 1, and the magnetic poles return to the middle stator magnetic pole of the T-shaped stator 1, as shown in fig. 2. The electromagnetic magnetic circuit of the U-shaped rotor 2 after the first rotor bias coil and the first rotor control coil are electrified is divided into two parts, and the magnetic circuit of the first part is as follows: a first rotor magnetic pole, an air gap and an inner magnetic conduction part corresponding to the T-shaped stator 1, a middle stator magnetic pole and an air gap of the T-shaped stator 1 and a middle magnetic conduction part of the U-shaped rotor 2; the second part of the magnetic circuit is as follows: the magnetic circuit of the first rotor magnetic pole, the air gap of the U-shaped rotor 2, the inner magnetic conduction part corresponding to the T-shaped stator 1, the outer magnetic conduction part of the T-shaped stator 1, the air gap, the second rotor magnetic pole of the U-shaped rotor 2 and two parts of magnetic circuits are shown in figure 3. Similarly, the electromagnetic magnetic circuit of the U-shaped rotor 2 after the second rotor bias coil and the second rotor control coil are electrified is divided into two parts, and the magnetic circuit of the first part is as follows: a second rotor magnetic pole, an air gap of the U-shaped rotor 2, an outer magnetic conduction part corresponding to the T-shaped stator 1, a middle stator magnetic pole of the T-shaped stator 1, an air gap and a middle magnetic conduction part of the U-shaped rotor 2; the second part of the magnetic circuit is as follows: a second rotor magnetic pole of the U-shaped rotor 2, an air gap, an outer magnetic conduction part corresponding to the T-shaped stator 1, an inner magnetic conduction part of the T-shaped stator 1, an air gap and a first rotor magnetic pole of the U-shaped rotor 2. 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 side magnetic conductive part of the T-shaped stator 1 and the first rotor magnetic pole of the U-shaped rotor 2 is equal to the axial gap between the outer side magnetic conductive part of the T-shaped stator 1 and the second rotor magnetic pole of the U-shaped rotor 2, 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 first rotor control coil and the second rotor control coil are energized to the first rotor magnetic pole, and the two magnetic fluxes are opposite in magnitude, so that the two magnetic fluxes cancel each other out, therefore, when the first rotor control coil and the second rotor control coil of the U-shaped rotor 2 are energized to the same magnitude and the same direction, the magnetic circuit is the same as that in fig. 2, and when the first rotor control coil and the second rotor control coil of the T-shaped stator 1 and the U-shaped rotor The resultant magnetic circuit is shown in fig. 4, in which the solid line shows the magnetic circuit diagram when the stator control coil is energized, the broken line shows the magnetic circuit diagram when the first rotor control coil and the second rotor control coil are energized simultaneously, and fig. 4 shows the case when the magnetic flux generated by energizing the first rotor control coil and the second rotor control coil is superimposed on the magnetic flux generated by energizing the stator coil, and vice versa.
When the axial magnetic bearing is applied, eight groups of T-shaped stators 1 and U-shaped rotors 2 are commonly arranged in the circumferential direction, wherein four groups of T-shaped stators 1 and U-shaped rotors 2 are arranged above a thrust disc, the other four groups of T-shaped stators 1 and U-shaped rotors 2 are arranged below the thrust disc, the four groups of T-shaped stators 1 and U-shaped rotors 2 above and below the thrust disc are arranged along the directions of + X, -X, + Y and Y, bias currents are introduced into corresponding bias coils in the four groups of T-shaped stators 1 and U-shaped rotors 2, the bias currents form bias magnetic fields at air gaps between the T-shaped stators 1 and the U-shaped rotors 2, and when the thrust disc moves along the axial direction-z, the stator control coils in the T-shaped stators 1 above the thrust disc are introduced with currents in the same direction as the bias currents, the magnetic field in the magnetic air gap between the T-shaped stator 1 and the U-shaped rotor 2 is enhanced, and meanwhile, the stator control coil in the T-shaped stator 1 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 T-shaped stator 1 and the U-shaped rotor 2 is weakened, the thrust disc moves in the + z direction, and then the thrust disc is restored to the balance position, and vice versa. When the thrust disc deflects along the + x direction, the magnetic gap between the T-shaped stator 1 and the U-shaped rotor 2 above the thrust disc along the + y direction is reduced, the magnetic gap between the T-shaped stator 1 and the U-shaped rotor 2 below the thrust disc along the + y direction is increased, the magnetic gap between the T-shaped stator 1 and the U-shaped rotor 2 above the thrust disc along the-y direction is increased, the magnetic gap between the T-shaped stator 1 and the U-shaped rotor 2 below the thrust disc along the-y direction is reduced, and at the moment, the current is introduced into the U-shaped rotor 2 below the thrust disc along the + y direction and the first rotor control coil and the second rotor control coil in the U-shaped rotor 2 above the thrust disc along the-y direction, so that the magnetic field generated at the magnetic position between the T-shaped stator 1 and the U-shaped rotor 2 and the air gap generated by the offset current are enabled to generate The magnetic field directions are the same, and meanwhile, currents are introduced into a U-shaped rotor arranged below the thrust disc along the-y direction and a first rotor control coil and a second rotor control coil in a U-shaped rotor 2 arranged above the thrust disc along the + y direction, so that the magnetic field generated at a magnetic air gap between the T-shaped stator 1 and the U-shaped rotor 2 is opposite to the magnetic field generated by the bias current, the thrust disc generates restoring force in the-x direction, and balance is achieved, and vice versa.
The upper part and the lower part of the thrust disc can also be respectively composed of eight groups of T-shaped stators 1 and U-shaped rotors 2 which are uniformly distributed along the circumferential direction, as shown in figure 6, wherein the four groups of T-shaped stators 1 and U-shaped rotors 2 are arranged along the directions of + X, -X, + Y and-Y; the T-shaped stators 1 and the U-shaped rotors 2 which are arranged along the directions of + X, -X, + Y and Y 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 T-shaped stators 1 and the U-shaped rotors 2 are used for bearing the weight of the thrust disc and a load arranged on the thrust disc, namely controlling the translation freedom degree of the thrust disc along the direction Z; 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 T-shaped stators 1 and the U-shaped rotors 2 above the thrust disc can be smaller than the axial magnetic air gap between the eight groups of T-shaped stators 1 and the U-shaped rotors 2 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 discs are generally two, namely an upper thrust disc and a lower thrust disc, and therefore when the structure is designed, the eight groups of T-shaped stators 1 are placed above or below the lower thrust disc, and loads such as a camera and the like are placed above the upper thrust disc. The other mode is that an asymmetric mode is adopted above and below the thrust disc, namely eight groups of T-shaped stators 1 and U-shaped rotors 2 are adopted above the thrust disc and are uniformly distributed along the circumference, four groups of T-shaped stators 1 and U-shaped rotors 2 are adopted below the thrust disc, and as shown in figure 7, the four groups of T-shaped stators 1 and U-shaped rotors 2 below the thrust disc are correspondingly arranged with the T-shaped stators 1 and the U-shaped rotors 2 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 a T-shaped stator 1 and a U-shaped rotor 2, the stator and the rotor are respectively provided with a bias coil and a control coil, the design of the bias coil of the T-shaped stator 1 and the design of the bias coil of the first rotor and the bias coil of the second rotor of the U-shaped rotor 2 greatly improve the utilization space and the utilization rate of the coils, and simultaneously improve the bearing capacity and the deflection control capacity of the bearing, in addition, the control coil of the T-shaped stator 1 is used for controlling the axial direction movement of a thrust disc, and the control coil of the first rotor and the control coil of the second rotor of the U-shaped rotor 2 are used for controlling the deflection movement of the thrust disc along the X direction and the Y direction, so that the volume and the weight of the existing magnetic bearing structure can be greatly reduced.
Drawings
FIG. 1 is an axial cross-sectional view of an axial magnetic bearing of the present invention;
FIG. 2 is a magnetic circuit diagram of the T-shaped stator bias coil or stator control coil of the axial magnetic bearing of the present invention after being energized;
FIG. 3 is a magnetic circuit diagram of the U-shaped rotor of the axial magnetic bearing according to the present invention after the first rotor bias coil or the first rotor control coil is energized;
FIG. 4 is a magnetic circuit diagram of the T-shaped stator control coil and the U-shaped rotor first rotor control coil and the second control coil of the axial magnetic bearing of the present invention after being simultaneously energized;
FIG. 5 is a symmetrical axial magnetic bearing configuration of the present invention, wherein 4 sets of "T" shaped stators and "U" shaped rotors are provided above and below the thrust plate;
FIG. 6 is a symmetrical axial magnetic bearing configuration of the present invention, wherein 8 sets of "T" shaped stators and "U" shaped rotors are provided above and below the thrust plate;
FIG. 7 shows an axial magnetic bearing structure of asymmetric structure of the present invention, wherein 8 sets of "T" shaped stators and "U" shaped rotors are provided above the thrust plate, and 4 sets of "T" shaped stators and "U" shaped rotors are provided below the thrust plate.
Detailed Description
As shown in fig. 1, a multi-coil axial magnetic bearing for a precision tracking support comprises a T-shaped stator 1 and a U-shaped rotor 2, wherein a stator bias coil 31 and a stator control coil 32 are wound on a middle stator magnetic pole of the T-shaped stator 1, and in this embodiment, the stator bias coil 31 of the T-shaped stator 1 is 2/5 of the middle stator magnetic pole in the radial height; 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 bias coil 41 and a first rotor control coil 42, and the second rotor magnetic pole is wound with a second rotor bias coil 51 and a second rotor control coil 52; the central line of the U-shaped rotor 2 is superposed with the central line of the magnetic pole of the middle stator, eight groups of T-shaped stators 1 and U-shaped rotors 2 are arranged on the circumferential direction, wherein four groups of T-shaped stators 1 and U-shaped rotors 2 are arranged above the thrust disc, the other four groups of T-shaped stators 1 and U-shaped rotors 2 are arranged below the thrust disc, and the four groups of T-shaped stators 1 and U-shaped rotors 2 above and below the thrust disc are arranged along the directions of + X, -X, + Y and-Y; an axial magnetic air gap 6 is formed between each group of T-shaped stators 1 and U-shaped rotors 2, as shown in figure 5;
for specific application, the stator bias coils 31, the first rotor bias coils 41, the second rotor bias coils 51 of the four sets of "T" shaped stators 1 above the thrust disc and the stator bias coils 31, the first rotor bias coils 41 and the second rotor bias coils 51 of the four sets of "T" shaped stators 1 below the thrust disc are supplied with certain bias currents (usually 1A to 3A), so that the directions of magnetic fields generated by the stator bias coils 31, the first rotor bias coils 41 and the second rotor bias coils 51 in the magnetic air gap between the "T" shaped stators 1 and the "U" shaped rotors 2 are consistent. When the thrust disc generates a deviation along the-Z direction, the stator control coils 32 in the four groups of "T" shaped stators 1 above the thrust disc are supplied with control current in the same direction as the stator bias coils 31 to make the magnetic field generated at the axial magnetic air gap in the same direction as the magnetic field generated by the stator bias coils 3, and the stator control coils 32 in the four groups of "T" shaped stators 1 below the thrust disc are supplied with control current in the opposite direction to the stator bias coils 31 to make the magnetic field generated at the axial magnetic air gap in the opposite direction to the magnetic field generated by the stator bias coils 3, so that the whole thrust disc generates a restoring force along the + Z direction. When the thrust disc deflects along the + Y direction, namely the axial magnetic gap between the T-shaped stator 1 and the U-shaped rotor 2 which are arranged along the + X direction above the thrust disc and the T-shaped stator 1 and the U-shaped rotor 2 which are arranged along the-X direction below the thrust disc is reduced, while the axial magnetic gap between the T-shaped stator 1 and the U-shaped rotor 2 which are arranged along the-X direction above the thrust disc and the T-shaped stator 1 and the U-shaped rotor 2 which are arranged along the + X direction below the thrust disc is increased, at the moment, the first rotor control coil and the second rotor control coil in the U-shaped rotor 2 which are arranged along the + X direction above the thrust disc and the U-shaped rotor 2 which is arranged along the-X direction below the thrust disc are both supplied with current with the same magnitude and the same direction, and the current direction is opposite to the bias current direction in the corresponding first rotor bias coil 41 and the second rotor bias coil 51, causing the magnetic field generated at the axial magnetic air gap to be opposite to the magnetic field generated at the axial magnetic air gap by the bias currents in the first rotor bias coil 41 and the second rotor bias coil 51 disposed along + X above the thrust disc and along-X below the thrust disc; and the U-shaped rotor 2 arranged along the-X direction above the thrust disc and the first rotor control coil 41 and the second rotor control coil 51 in the U-shaped rotor 2 arranged along the + X direction below the thrust disc are both introduced with currents with equal magnitude and same direction, so that the magnetic field generated at the axial magnetic air gap is the same as the magnetic field generated by the first rotor bias coil 41 and the second rotor bias coil 51 arranged along the-X direction above the thrust disc and along the + X direction below the thrust disc, and at the moment, the thrust disc is subjected to a moment along the-Y direction to keep balance.
The upper part and the lower part of the thrust disc can also be respectively composed of eight groups of T-shaped stators 1 and U-shaped rotors 2 which are uniformly distributed along the circumferential direction, as shown in figure 6, wherein the four groups of T-shaped stators 1 and U-shaped rotors 2 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 rest four groups of T-shaped stators 1 and U-shaped rotors 2 are used for bearing the weight of the thrust disc and the load arranged on the thrust disc, namely controlling the translation freedom degree of the thrust disc along the direction of Z; 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 T-shaped stators 1 and the U-shaped rotors 2 above the thrust disc can be smaller than the axial magnetic air gap between the eight groups of T-shaped stators 1 and the U-shaped rotors 2 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 discs are generally two, namely an upper thrust disc and a lower thrust disc, and therefore when the structure is designed, the eight groups of T-shaped stators 1 are placed above or below the lower thrust disc, and loads such as a camera and the like are placed above the upper thrust disc. The other mode is that an asymmetric mode is adopted above and below the thrust disc, namely eight groups of T-shaped stators 1 and U-shaped rotors 2 are adopted above the thrust disc and are uniformly distributed along the circumference, four groups of T-shaped stators and U-shaped rotors are adopted below the thrust disc, and as shown in figure 7, the four groups of T-shaped stators 1 and U-shaped rotors 2 below the thrust disc are correspondingly arranged with the T-shaped stators 1 and U-shaped rotors 2 above the thrust disc along the directions of + X, -X, + Y and Y.
The T-shaped stator 1 and the U-shaped 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 precise tracking bracket is characterized in that: the magnetic field generator consists of a T-shaped stator (1) and a U-shaped rotor (2), wherein a stator bias coil (31) and a stator control coil (32) are wound on a middle stator magnetic pole of the T-shaped stator (1); the U-shaped rotor (2) 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 bias coil (41) and a first rotor control coil (42), and the second rotor magnetic pole is wound with a second rotor bias coil (51) and a second rotor control coil (52); the center line of the U-shaped rotor (2) is superposed with the center line of the magnetic pole of the middle stator, eight groups of T-shaped stators (1) and U-shaped rotors (2) are arranged in the circumferential direction, wherein four groups of T-shaped stators (1) and U-shaped rotors (2) are arranged above the thrust disc, the other four groups of T-shaped stators (1) and U-shaped rotors (2) are arranged below the thrust disc, and the four groups of T-shaped stators (1) and U-shaped rotors (2) above and below the thrust disc are arranged along the directions of + X, -X, + Y and-Y; an axial magnetic air gap (6) is formed between each group of T-shaped stators (1) and U-shaped rotors (2); bias currents are introduced into the stator bias coil (31), the first rotor bias coil (41) and the second rotor bias coil (51) to form a bias magnetic field in the axial magnetic air gap (6), control currents are introduced into the stator control coil (32) to achieve translational control of the thrust disc along the Z direction, and control currents are introduced into the first rotor control coil (42) and the second rotor control coil (52) to achieve 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 T-shaped stators (1) and U-shaped rotors (2) are arranged above the thrust disc and are uniformly distributed along the circumferential direction, wherein the four groups of T-shaped stators (1) and U-shaped rotors (2) are arranged along the directions of + X, -X, + Y and Y; the lower portion of the thrust disc is composed of eight groups of T-shaped stators (1) and U-shaped rotors (2), the eight groups of T-shaped stators (1) and the U-shaped rotors (2) are arranged correspondingly to the eight groups of T-shaped stators (1) and the U-shaped rotors (2) above the thrust disc, and axial magnetic air gaps (6) are formed between the T-shaped stators (1) and the U-shaped rotors (2) above the thrust disc and are unequal to axial magnetic air gaps (6) formed between the T-shaped stators (1) and the U-shaped rotors (2) below the thrust disc.
3. The axial magnetic bearing of claim 1, wherein: eight groups of T-shaped stators (1) and U-shaped rotors (2) are arranged above the thrust disc and are uniformly distributed along the circumferential direction, wherein the four groups of T-shaped 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 is composed of four groups of T-shaped stators (1) and U-shaped rotors (2), and the T-shaped stators (1) and the U-shaped rotors (2) which are arranged along the directions of + X, -X, + Y and Y are correspondingly arranged on the upper part of the thrust disc.
4. The axial magnetic bearing of claim 1, wherein: the T-shaped stator (1) and the U-shaped 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.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018114148110 | 2018-11-26 | ||
| CN201811414811.0A CN109268390A (en) | 2018-11-26 | 2018-11-26 | A kind of precision tracking bracket multi-coil axial magnetic bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109681528A CN109681528A (en) | 2019-04-26 |
| CN109681528B true CN109681528B (en) | 2020-05-05 |
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| CN201811414811.0A Pending CN109268390A (en) | 2018-11-26 | 2018-11-26 | A kind of precision tracking bracket multi-coil axial magnetic bearing |
| CN201910125380.4A Active CN109681528B (en) | 2018-11-26 | 2019-02-20 | Multi-coil axial magnetic bearing for precision tracking support |
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| CN201811414811.0A Pending CN109268390A (en) | 2018-11-26 | 2018-11-26 | A kind of precision tracking bracket multi-coil axial magnetic bearing |
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| CN104265761A (en) * | 2014-09-11 | 2015-01-07 | 江苏大学 | Novel axial-radial three-degree-of-freedom hybrid magnetic bearing |
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| JPS57103926A (en) * | 1980-12-22 | 1982-06-28 | Natl Aerospace Lab | Magnetic bearing device |
| JPH0798016A (en) * | 1993-09-28 | 1995-04-11 | Ebara Corp | Magnetic bearing device |
| CN1315774A (en) * | 2000-03-29 | 2001-10-03 | 三星电机株式会社 | Contactless driven electric machine |
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| KR20060038088A (en) * | 2004-10-29 | 2006-05-03 | 한국과학기술연구원 | Combination radial-axial magnetic bearing |
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| KR20110032910A (en) * | 2009-09-24 | 2011-03-30 | 한국기계연구원 | Thrust magnetic bearing which can easily distribute dynamic load and static load |
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| CN108612752A (en) * | 2018-06-25 | 2018-10-02 | 南京航空航天大学 | Electromagnetic suspension hub-bearing unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109268390A (en) | 2019-01-25 |
| CN109681528A (en) | 2019-04-26 |
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