A moving-coil double magnetic circuit axial magnetization rotating Lorentz force magnetic bearing

Abstract

The application discloses a moving-coil type double-magnetic-circuit axial magnetization rotating Lorentz force magnetic bearing, which mainly comprises a left stator assembly, a right stator assembly and a rotor assembly; the left stator assembly mainly comprises two magnetic conducting rings, two magnetic steel rings, a left paramagnetic patch and a left magnetic isolation ring; the right stator assembly mainly comprises two magnetic conducting rings, two magnetic steel rings, a right paramagnetic patch and a right magnetic isolation ring; and the rotor assembly mainly comprises four closed coils and a coil framework; the two magnetic steel rings are arranged in parallel in the recesses of the magnetic conducting rings to create a high magnetic density air gap magnetic field; the four magnetic steel rings are arranged in a central symmetrical mode, so that the upper and lower air gap magnetic densities are uniformly distributed to form a double closed magnetic circuit, and the four series coils are symmetrically wound on the outer side of the framework in an axial direction, so that the coils are close to the two side magnetic steel rings and act on the high magnetic density area of the air gap; the axial magnetization mode is adopted to effectively avoid the magnetic density divergence phenomenon existing in the traditional radial magnetization, the moving-coil type rotor has low mass and high load capacity, and the rotating stability is greatly improved.

Description

Technical Field

[0001] This invention relates to a Lorentz force magnetic bearing, and more particularly to a moving-coil type dual magnetic circuit axially magnetized rotating Lorentz force magnetic bearing. Background Technology

[0002] With the rapid development of aerospace technology, high-resolution reconnaissance, laser communication, and other aerospace missions place urgent demands on the attitude stability, agility, and ultra-quiet performance of spacecraft, necessitating the exploration of new approaches to spacecraft attitude control technology. Spacecraft platforms place increasingly higher demands on the torque accuracy of their attitude control systems, which traditional mechanical bearings struggle to meet. Based on different methods of electromagnetic force calculation and representation, magnetic bearings can be divided into reluctance magnetic bearings and Lorentz force magnetic bearings. Reluctance magnetic bearings generate a magnetic field by energizing coils, controlling the magnitude of the air gap reluctance between the stator and rotor to change the electromagnetic force and achieve contactless rotor levitation; however, the electromagnetic force and current have a square relationship. Lorentz force magnetic bearings create an air gap magnetic field through the rational placement of magnets; both the air gap reluctance and magnetomotive force are constant, and the Lorentz force has a linear relationship with the current, making them suitable for high-precision control. Selecting magnetic levitation bearings avoids the friction and wear defects of mechanical bearings and offers advantages such as high precision, low vibration, and long lifespan, with torque accuracy reaching 10. - 5 On the order of nm, it is an ideal inertial actuator for spacecraft platforms. The Lorentz force rotary magnetic bearing has a large output control torque and a wide rotation range, effectively improving the platform's maneuverability.

[0003] In the prior art, the two-degree-of-freedom Halbach array explicit Lorentz force deflection magnetic bearing described in authorized patent ZL201610920731.7 adopts a Halbach array magnet structure, with the magnets located at the magnetic extreme ends. This results in significant magnetic leakage at the air gap edge, leading to low rotor control accuracy in the air gap. Authorized patent ZL2022114992524 describes a rotating Lorentz force magnetic bearing that uses an annular radial magnetization method to overcome the small rotation angle drawback of existing columnar air gap Lorentz force magnetic bearings. However, its magnetic field air gap magnetic flux density uniformity is poor, and the uneven force on the working winding in the air gap magnetic field inhibits the rotational accuracy of the magnetic bearing.

[0004] In summary, improving the uniformity and magnitude of magnetic flux density to enhance the stability and rotational maneuverability of rotating magnetic bearings is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing, which uses four fan-shaped axially magnetized steel rings arranged in a reasonable position to transform the traditional single magnetic flux loop topology into a dual magnetic flux loop with opposite magnetic field directions.

[0006] The objective of this invention is achieved through the following technical solutions.

[0007] The present invention relates to a moving-coil type dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing, mainly composed of a left stator assembly, a right stator assembly, and a rotor assembly. The left stator assembly mainly includes: an upper left magnetic guide ring, an upper left sector-shaped magnetic steel ring, a left magnetic isolation ring, a lower left magnetic guide ring, a lower left sector-shaped magnetic steel ring, and a left paramagnetic patch; the right stator assembly mainly includes: an upper right magnetic guide ring, an upper right sector-shaped magnetic steel ring, a right magnetic isolation ring, a lower right magnetic guide ring, a lower right sector-shaped magnetic steel ring, and a right paramagnetic patch; the rotor assembly mainly includes: a left front lug-shaped winding, a left rear lug-shaped winding, a right front lug-shaped winding, a right rear lug-shaped winding, and a coil frame; the upper left sector-shaped magnetic steel ring and the lower left sector-shaped magnetic steel ring in the left stator assembly are coaxially aligned and centered with the left magnetic isolation ring, and the upper left sector-shaped magnetic steel ring... The outer circumferential curved surface of the lower left fan-shaped magnet ring and the inner circumferential curved surface of the left magnetic isolation ring are fitted together to form the left magnet-magnetic isolation ring component. The left axial end face of the left magnet-magnetic isolation ring component is coaxially and centrally assembled with the right axial end faces of the upper left and lower left magnetic guide rings. The right axial end face of the left magnet-magnetic isolation ring component is coaxially and tightly fitted with the left axial end face of the left paramagnetic patch. Similarly, the upper right and lower right fan-shaped magnet rings in the right stator assembly are coaxially and centrally assembled with the right magnetic isolation ring. The outer circumferential curved surfaces of the upper right and lower right fan-shaped magnet rings and the inner circumferential curved surface of the right magnetic isolation ring are fitted together to form the right magnet-magnetic isolation ring component. The right axial end face of the right magnet-magnetic isolation ring component is coaxially and centrally assembled with the left axial end faces of the upper right and lower right magnetic guide rings. The upper left magnetic ring is located at the upper radial end of the left magnet-insulating ring component and the left paramagnetic patch (3). The inner axial end face of the upper left magnetic ring is fully attached to the left axial end face of the upper left fan-shaped magnet ring and fastened with screws. The lower left magnetic ring is located at the lower radial end of the left magnet-insulating ring component and the left paramagnetic patch. The inner axial end face of the lower left magnetic ring is fully attached to the left axial end face of the lower left fan-shaped magnet ring and fastened with screws to form the left stator assembly. The upper right magnetic ring is located at the upper radial end of the right magnet-insulating ring component and the right paramagnetic patch. The inner axial end face of the upper right magnetic ring is fully attached to the right axial end face of the upper right fan-shaped magnet ring and fastened with screws to form the left stator assembly. At the radial lower end, the inner axial end face of the lower right magnetic ring is completely attached to the left axial end face of the lower right fan-shaped magnetic ring and fastened with screws to form the right stator assembly; the upper left and lower left magnetic rings in the left stator assembly are fastened to the left axial end faces of the upper right and lower right magnetic rings in the right stator assembly by array screws to form a complete stator assembly of a moving coil type dual magnetic circuit axially magnetized rotating Lorentz force magnetic bearing; the left front lug winding and the left rear lug winding in the rotor assembly are located on the left axial end face of the coil skeleton and are located on the right side of the axial axis with a certain distance from the right axial end face of the left paramagnetic patch; the right front lug winding and the right rear lug winding are located on the right axial end face of the coil skeleton and are located on the left side of the axial axis with a certain distance from the left axial end face of the right paramagnetic patch.

[0008] The present invention relates to a moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing. In the rotating magnetic bearing, two magnetic rings in each axial layer are locked together by screws, forming an inverted saddle shape. There are two grooves on the radial inner side of the saddle surface, and the two grooves are arranged at intervals to sweep the circumferential curved surface of the magnetic ring. The inner and outer diameters of the paramagnetic patch are the same as those of the fan-shaped magnetic steel ring, and the inner and outer diameters of the magnetic isolation components on the left and right fan surfaces inside the magnetic isolation ring are the same as those of the fan-shaped magnetic steel ring.

[0009] The present invention relates to a moving-coil dual-magnetic-circuit axially magnetized Lorentz force magnetic bearing. The rotor assembly is disc-shaped, with the inner radial side of the coil skeleton being a hollow boss and the outer radial side being a convex shape. Each of the left and right axial end faces has a vertically connected groove symmetrically passing through the center. The left front and left rear ear-shaped windings are wound in the left circumferential flange and the left radial groove passing through the center of the coil skeleton. Similarly, the right front and right rear ear-shaped windings are wound in the right circumferential flange and the right radial groove passing through the center of the coil skeleton. The coil skeleton and the four series-connected closed coils form a centrally symmetrical rotor assembly structure with "windings on the outside and skeleton on the inside". Its structural advantage avoids the influence of air gap magnetic resistance on the axial air density attenuation, which would cause inconsistent force on the four series-connected coils and cause the rotor to oscillate during rotation.

[0010] The present invention relates to a moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing. The upper left, upper right, lower left, and lower right sector-shaped magnetic steel rings have identical circumferential arc segments and are made of permanent magnet alloy material with equal axial magnetization thickness. The axially magnetized magnetic steel rings exhibit low magnetic leakage on their radial inner and outer arc surfaces, preventing diffusion of the air gap magnetic flux and thus reducing its uniformity. The magnetization directions of the upper left and upper right sector-shaped magnetic steel rings are left-S and right-N, respectively. The magnetic flux in the upper magnetic circuit passes sequentially through the upper left sector-shaped magnetic steel ring, the upper right sector-shaped magnetic steel ring, and the lower right sector-shaped magnetic steel ring. The upper radial end of the paramagnetic patch, the upper effective winding section of the rotor, the upper radial end of the right paramagnetic patch, the upper right sector-shaped magnet ring, and the upper magnetic guide ring form a closed loop; the magnetization direction of the lower left sector-shaped magnet ring and the lower right sector-shaped magnet ring is left N and right S. In the lower magnetic circuit, the magnetic flux passes through the lower right sector-shaped magnet ring, the lower radial end of the right paramagnetic patch, the lower effective winding section of the rotor, the lower radial end of the left paramagnetic patch, the lower left sector-shaped magnet ring, and the lower magnetic guide ring in sequence to form a closed loop. This structure transforms the traditional single magnetic circuit magnetic bearing topology into a dual magnetic circuit with superior characteristics.

[0011] The present invention relates to a moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz magnetic bearing. The rotor assembly contains a coil skeleton with an axial end face groove depth equal to the thickness of a single coil winding. The inner and outer diameters of its radial flange are the same as the dimensions of the coil's circumferential semicircular section. The radially inner hollow circle is mechanically fixed to the shaft for large-angle motorized rotation. The inner diameter of the circumferential semicircular section of the lug-shaped coil within the rotor assembly is larger than the outer diameter of the fan-shaped magnetic ring, preventing interference torque from the coil in the non-working circumferential section from suppressing rotor control accuracy. Brass coils are neatly glued in a double-parallel winding manner within the axial grooves and radial flanges of the coil skeleton, forming four series-closed lug-shaped windings. The ingenious external symmetrical rotor assembly structure allows the working windings to symmetrically approach the magnetic rings on both sides, acting on the high magnetic density region of the air gap, enabling the output of greater torque under the same current, effectively reducing the current consumption of the rotating Lorentz magnetic bearing.

[0012] As can be seen from the technical solution provided by the present invention, the moving coil type dual magnetic circuit axially magnetized rotating Lorentz force magnetic bearing provided by the present invention adopts a fan-shaped axial magnetization method to eliminate the radial magnetic circuit phenomenon in radial magnetization, improve the uniformity of magnetic flux density, and the four fan-shaped magnetic steel rings are arranged in parallel intervals to form a symmetrical arrangement of upper and lower magnetic steel rings. The traditional single magnetic circuit topology is transformed into a dual magnetic circuit, which increases the winding working section of the coil acting in the magnetic field, effectively reduces the power consumption of the Lorentz force magnetic bearing and improves the rotational torque control accuracy. Attached Figure Description

[0013] Figure 1 This is a radial cross-sectional view of the moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing of the present invention.

[0014] Figure 2 This is a radial three-dimensional cross-sectional view of the moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing of the present invention.

[0015] Figure 3 This is a diagram of the dual flux loop of the rotating Lorentz force magnetic bearing of the present invention.

[0016] Figure 4 This is a structural diagram of the rotating Lorentz force magnetic bearing rotor of the present invention.

[0017] Figure 5 This is a force diagram of the working winding of the rotating Lorentz force magnetic bearing of the present invention.

[0018] Figure 6 This is a schematic diagram of the magnet-magnetic shielding component in the stator of the rotating magnetic bearing in an embodiment of the present invention. Detailed Implementation

[0019] The embodiments of the present invention will now be described in further detail. Contents not described in detail in the embodiments of the present invention are prior art known to those skilled in the art.

[0020] A preferred embodiment of the moving-coil dual-magnetic-circuit axially magnetized Lorentz force magnetic bearing of the present invention is as follows: The present invention relates to a moving-coil type dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing, mainly composed of a left stator assembly, a right stator assembly, and a rotor assembly. The left stator assembly mainly includes: an upper left magnetic guide ring, an upper left sector-shaped magnetic steel ring, a left magnetic isolation ring, a lower left magnetic guide ring, a lower left sector-shaped magnetic steel ring, and a left paramagnetic patch; the right stator assembly mainly includes: an upper right magnetic guide ring, an upper right sector-shaped magnetic steel ring, a right magnetic isolation ring, a lower right magnetic guide ring, a lower right sector-shaped magnetic steel ring, and a right paramagnetic patch; the rotor assembly mainly includes: a left front lug-shaped winding, a left rear lug-shaped winding, a right front lug-shaped winding, a right rear lug-shaped winding, and a coil frame; the upper left sector-shaped magnetic steel ring and the lower left sector-shaped magnetic steel ring in the left stator assembly are coaxially aligned and centered with the left magnetic isolation ring, and the upper left sector-shaped magnetic steel ring... The outer circumferential curved surface of the lower left fan-shaped magnet ring and the inner circumferential curved surface of the left magnetic isolation ring are fitted together to form the left magnet-magnetic isolation ring component. The left end face of the left magnet-magnetic isolation ring component is coaxially and centrally assembled with the right end faces of the upper left and lower left magnetic guide rings. The right end face of the left magnet-magnetic isolation ring component is coaxially and tightly fitted with the left end face of the left paramagnetic patch. Similarly, the upper right and lower right fan-shaped magnet rings in the right stator assembly are coaxially and centrally assembled with the right magnetic isolation ring. The outer circumferential curved surfaces of the upper right and lower right fan-shaped magnet rings and the inner circumferential curved surface of the right magnetic isolation ring are fitted together to form the right magnet-magnetic isolation ring component. The right end face of the right magnet-magnetic isolation ring component is coaxially and centrally assembled with the left end faces of the upper right and lower right magnetic guide rings. The end face is coaxially and tightly fastened to the right end face of the right paramagnetic patch; the upper left magnetic guide ring is located at the radial upper end of the left magnet-magnetic shielding ring component and the left paramagnetic patch, with its axial inner end face completely attached to the axial left end face of the upper left fan-shaped magnet ring and fastened with screws; the lower left magnetic guide ring is located at the radial lower end of the left magnet-magnetic shielding ring component and the left paramagnetic patch, with its axial inner end face completely attached to the axial left end face of the lower left fan-shaped magnet ring and fastened with screws to form the left stator assembly; the upper right magnetic guide ring is located at the radial upper end of the right magnet-magnetic shielding ring component and the right paramagnetic patch, with its axial inner end face completely attached to the axial right end face of the upper right fan-shaped magnet ring and fastened with screws; the lower right magnetic guide ring is located at the radial upper end of the right magnet-magnetic shielding ring component and the right paramagnetic patch. At the downward end, the inner axial end face of the lower right magnetic ring and the left axial end face of the lower right fan-shaped magnetic ring are completely attached and fastened together with screws to form the right stator assembly; the right axial end faces of the upper left and lower left magnetic rings in the left stator assembly are fastened together with the left axial end faces of the upper right and lower right magnetic rings in the right stator assembly using array screws to form a complete stator assembly of a moving coil type dual magnetic circuit axially magnetized rotating Lorentz force magnetic bearing; the left front lug winding and the left rear lug winding in the rotor assembly are located on the left axial end face of the coil frame and are located on the right side of the axial axis with a certain distance from the right axial end face of the left paramagnetic patch; the right front lug winding and the right rear lug winding are located on the right axial end face of the coil frame and are located on the left side of the axial axis with a certain distance from the left axial end face of the right paramagnetic patch.

[0021] The present invention relates to a moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing, characterized in that: in the rotating magnetic bearing, two magnetic rings in each axial layer are locked together by screws, forming an inverted saddle shape, with two grooves on the radial inner side of the saddle surface, the two grooves being arranged at intervals to sweep the circumferential curved surface of the magnetic ring; the inner and outer diameters of the paramagnetic patch are the same as those of the fan-shaped magnetic steel ring, and the inner and outer diameters of the magnetic isolation components on the left and right fan surfaces inside the magnetic isolation ring are the same as those of the fan-shaped magnetic steel ring.

[0022] The present invention relates to a moving-coil dual-magnetic-circuit axially magnetized Lorentz force magnetic bearing, characterized in that: the rotor assembly is disc-shaped, the inner radial side of the coil skeleton is a hollow boss, the outer radial side is a convex shape, and each of the left and right axial end faces has a vertical groove symmetrically connected through the center; the left front and left rear ear-shaped windings are wound in the left circumferential flange and the left radial groove through the center of the coil skeleton; similarly, the right front and right rear ear-shaped windings are wound in the right circumferential flange and the right radial groove through the center of the coil skeleton. The coil skeleton and the four series closed coils form a centrally symmetrical rotor assembly structure with "windings on the outside and skeleton on the inside". Its structural advantage avoids the influence of air gap magnetic resistance on the axial air density attenuation, which would cause inconsistent force on the four series coils and cause the rotor to oscillate during rotation.

[0023] The present invention relates to a moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing, characterized in that: the upper left, upper right, lower left, and lower right sector-shaped magnetic steel rings have the same circumferential arc segment and are made of permanent magnet alloy material with equal axial magnetization thickness. The axially magnetized magnetic steel rings exhibit low magnetic leakage on their radial inner and outer arc surfaces, preventing diffusion of the air gap magnetic flux and thus reducing its uniformity; the magnetization directions of the upper left and upper right sector-shaped magnetic steel rings are left-S and right-N, and the magnetic flux in the upper magnetic circuit sequentially passes through the upper left sector-shaped magnetic steel ring. The ring, the upper radial end of the left paramagnetic patch, the effective winding section at the upper end of the rotor, the upper radial end of the right paramagnetic patch, the upper right fan-shaped magnetic ring, and the upper magnetic guide ring form a closed loop; the magnetization direction of the lower left fan-shaped magnetic ring and the lower right fan-shaped magnetic ring is left N and right S. In the lower magnetic circuit, the magnetic flux passes through the lower right fan-shaped magnetic ring, the lower radial end of the right paramagnetic patch, the effective winding section at the lower end of the rotor, the lower radial end of the left paramagnetic patch, the lower left fan-shaped magnetic ring, and the lower magnetic guide ring in sequence to form a closed loop. This structure transforms the traditional single magnetic circuit magnetic bearing topology into a dual magnetic circuit with superior characteristics.

[0024] The present invention relates to a moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz magnetic bearing, characterized in that: the depth of the groove on the axial end face of the coil skeleton inside the rotor assembly is the same as the thickness of a single coil winding; the inner and outer diameters of its radial flange are the same as the dimensions of the circumferential semicircular section of the coil; the radially inner hollow circle is mechanically fixed to the shaft for large-angle motorized rotation; the inner diameter of the circumferential semicircular section of the lug-shaped coil inside the rotor assembly is larger than the outer diameter of the fan-shaped magnetic ring, avoiding interference torque generated by the coil in the non-working section of the circumferential direction, which inhibits the rotor control accuracy; the brass coil is neatly glued in a double parallel winding manner in the grooves on both sides of the axial direction and the flanges on both sides of the radial direction to form four series closed lug-shaped windings; its external symmetrical rotor assembly structure ingeniously makes the working windings symmetrically close to the magnetic rings on both sides, acting on the high magnetic density region of the air gap, which can output a larger torque under the same current, effectively reducing the current consumption of the rotating Lorentz magnetic bearing.

[0025] The present invention relates to a moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing, characterized in that: the air gap magnetic flux density in the upper and lower dual magnetic circuits is equal; after each closed lug-shaped coil is energized, the radial upper and lower working winding segments act on the upper and lower magnetic fields with equal magnitude and opposite direction, forming a force couple to drive the rotor to rotate; the rotating magnetic bearing detects the rotor angular displacement through a servo component and dynamically adjusts the magnitude and direction of the coil current in real time to ensure that the rotor rotates around the axis with high precision and stability in an approximately 1π space, which facilitates the platform to complete target tracking and aiming.

[0026] The principle behind the above scheme is: The moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing provided by this invention is a single-degree-of-freedom rotary control magnetic bearing. The upper magnetic circuit of this invention is as follows: magnetic flux originates from the S pole of the upper left sector-shaped magnetic ring, passes through the N pole of the upper left sector-shaped magnetic ring, crosses the upper axial air gap, reaches the S pole of the upper right sector-shaped magnetic ring, then flows out from the N pole of the upper right sector-shaped magnetic ring, and passes through the upper right and upper left magnetic guide rings back to the S pole of the upper left sector-shaped magnetic ring. The lower magnetic circuit of this invention is as follows: magnetic flux originates from the lower left axial... The magnetized magnet flows out from the N pole, passes through the S pole of the lower left sector-shaped magnet ring, passes through the lower axial air gap, reaches the N pole of the lower right sector-shaped magnet ring, then flows out from the S pole of the lower right sector-shaped magnet ring, passes through the lower right magnetic guide ring and the lower left magnetic guide ring, and then merges into the N pole of the lower left sector-shaped magnet ring to form a closed magnetic circuit. When the coil is energized, the single closed coil located in the upper and lower air gaps is subjected to a pair of Lorentz forces of equal magnitude and opposite direction, forming a couple, which controls the rotor to rotate around the shaft.

[0027] The advantages of this invention compared to the prior art are: The moving-coil dual-magnetic-circuit axially magnetized Lorentz force magnetic bearing provided by this invention adopts a double-ring, common-axis, axially magnetized sector-shaped magnetic steel ring. Addressing the difficulty of radial magnetization, the axial magnetization method achieves significant magnetic concentration, generating higher magnetic flux density, which is beneficial for enabling the rotor to output high-precision, highly stable deflection torque. The spaced arrangement of the upper left and upper right sector-shaped magnetic steel rings with the lower left and lower right sector-shaped magnetic steel rings increases the main magnetic flux, reduces leakage flux, and thus improves the air gap magnetic density. The moving-coil rotor significantly reduces the rotor mass of the magnetic bearing itself, significantly improving load capacity. The closed-loop winding on both sides of the axial direction avoids uneven force distribution caused by low magnetic density in the middle of the air gap. The coils act on the magnetic field, cutting magnetic lines of force to generate Lorentz force, driving the magnetic bearing stator and rotor to reciprocate in a relatively large-angle, high-precision, and highly dynamic manner. To enhance the agile maneuverability of the rotating magnetic bearing, paramagnetic patches are added to the surface of the magnets near the air gap. Magnetic insulating material is filled between the magnetic guide ring and the radial direction of the magnets. Magnetic insulating rings are added between the inverted saddle-shaped magnetic guide ring and the fan-shaped magnetic steel rings to prevent a single magnetic steel ring from creating a self-closing magnetic circuit, maximizing the uniformity of the air gap magnetic flux density. The coil frame is made of ceramic, which has good rigidity to prevent damage to the rotor assembly structure under high dynamic motion. Its non-magnetic material has no hysteresis or eddy current losses, eliminating interference forces and thus reducing the rotor starting current. A symmetrical dual-magnetic-circuit layout in the circumferential direction significantly increases the rotor deflection range while ensuring torque accuracy. To improve the omnidirectional deflection capability of the rotating magnetic bearing, two identical fan-shaped magnetic steel rings are arranged axially and installed inside the magnetic guide ring, transforming the traditional single-magnetic-circuit topology into a dual-magnetic-circuit. This increases the number of magnetic circuits and improves magnetic flux density uniformity while optimizing the closed-center symmetrical dual-magnetic-circuit, effectively reducing the magnetic reluctance generated by non-magnetic steel components and suppressing the uniformity of the air gap magnetic flux density. The magnetic flux density is consistent in magnitude and opposite in direction throughout the upper and lower air gaps, which avoids the rotor oscillation caused by external factors such as leakage of magnetic flux or uneven magnetic flux density during the deflection process of the symmetrical external coil. The dual magnetic circuit is conducive to outputting high-performance, large-angle rotation control torque.

[0028] like Figure 1 and Figure 2As shown, a moving-coil type dual-magnetic-circuit axially magnetized Lorentz force magnetic bearing mainly consists of a left stator assembly, a right stator assembly, and a rotor assembly. The left stator assembly mainly includes: an upper left magnetic guide ring 1A, an upper left sector-shaped magnetic steel ring 2A, a left magnetic isolation ring 6, a lower left magnetic guide ring 1B, a lower left sector-shaped magnetic steel ring 2B, and a left paramagnetic patch 3; the right stator assembly mainly includes: an upper right magnetic guide ring 11A, an upper right sector-shaped magnetic steel ring 7A, a right magnetic isolation ring 10, a lower right magnetic guide ring 11B, a lower right sector-shaped magnetic steel ring 7B, and a right paramagnetic patch 9. The rotor assembly mainly includes: a left front lug-shaped winding 4B, a left rear lug-shaped winding 4A, a right front lug-shaped winding 8B, a right rear lug-shaped winding 8A, and a coil frame 5; the upper left sector-shaped magnet ring 2A and the lower left sector-shaped magnet ring 2B in the left stator assembly are coaxially aligned and centered with the left magnetic isolation ring 6. The outer circumferential curved surfaces of the upper left sector-shaped magnet ring 2A and the lower left sector-shaped magnet ring 2B are fitted with the inner circumferential curved surface of the left magnetic isolation ring 6 to form a left magnet-magnetic isolation ring component. The axial left end face of the left magnet-magnetic isolation ring component is coaxially aligned and centered with the axial right end face of the upper left magnetic guide ring 1A and the lower left magnetic guide ring 1B. The axial right end face of the component is coaxially and tightly bonded to the axial left end face of the left paramagnetic patch 3. The upper right sector-shaped magnet ring 7A and the lower right sector-shaped magnet ring 7B within the right stator assembly are coaxially and centrally assembled with the right magnetic isolation ring 10. The outer circumferential curved surfaces of the upper right sector-shaped magnet ring 7A and the lower right sector-shaped magnet ring 7B are bonded to the inner circumferential curved surface of the right magnetic isolation ring 10 to form the right magnet-magnetic isolation ring component. The axial right end face of the right magnet-magnetic isolation ring component is coaxially and centrally assembled with the axial left end faces of the upper right magnetic guide ring 11A and the lower right magnetic guide ring 11B. The axial left end face of the right magnet-magnetic isolation ring component is coaxially and tightly bonded to the axial right end face of the right paramagnetic patch 9. The upper left magnetic guide ring 1A is located at the upper radial end of the left magnet-magnetic shielding ring component and the left paramagnetic patch 3. The inner axial end face of the upper left magnetic guide ring 1A is completely attached to the left axial end face of the upper left fan-shaped magnet ring 2A and is fastened with screws. The lower left magnetic guide ring 1B is located at the lower radial end of the left magnet-magnetic shielding ring component and the left paramagnetic patch 3. The inner axial end face of the lower left magnetic guide ring 1B is completely attached to the left axial end face of the lower left fan-shaped magnet ring 2B and is fastened with screws to form the left stator assembly. The upper right magnetic guide ring 11A is located at the upper radial end of the right magnet-magnetic shielding ring component and the right paramagnetic patch 9. The inner axial end face of the upper right magnetic guide ring 11A is completely attached to the left axial end face of the right fan-shaped magnet ring 2B and is fastened with screws to form the left stator assembly. The upper sector-shaped magnet ring 7A is completely attached to the right end face and fastened with screws. The lower right magnetic guide ring 11B is located at the radial lower end of the right magnet-insulating ring component and the right paramagnetic patch 9. The inner axial end face of the lower right magnetic guide ring 11B is completely attached to the left axial end face of the lower right sector-shaped magnet ring 7B and fastened with screws to form the right stator assembly. The upper left magnetic guide ring 1A and the lower left magnetic guide ring 1B in the left stator assembly are fastened to the left axial end faces of the upper right magnetic guide ring 11A and the lower right magnetic guide ring 11B in the right stator assembly by array screws to form a complete stator assembly of a moving coil type dual magnetic circuit axially magnetized rotating Lorentz force magnetic bearing.The left front lug winding 4B and left rear lug winding 4A within the rotor assembly are located on the axial left end face of the coil frame 5, and are positioned on its axial right side with a certain distance from the axial right end face of the left paramagnetic patch 3; the right front lug winding 8B and right rear lug winding 8A are located on the axial right end face of the coil frame 5, and are positioned on its axial left side with a certain distance from the axial left end face of the right paramagnetic patch 9.

[0029] Figure 3 The magnetic circuit diagram of this invention shows that in the upper magnetic circuit, the magnetic flux sequentially passes through the upper left sector-shaped magnetic steel ring 2A, the upper radial end of the left paramagnetic patch 3, the upper effective winding section of the rotor, the upper radial end of the right paramagnetic patch 9, the upper right sector-shaped magnetic steel ring 7A, and the upper magnetic guide ring 1A to form a closed loop; the magnetization directions of the lower left sector-shaped magnetic steel ring 2B and the lower right sector-shaped magnetic steel ring 7B are left N and right S. In the lower magnetic circuit, the magnetic flux sequentially passes through the lower right sector-shaped magnetic steel ring 7B, the lower radial end of the right paramagnetic patch 9, the lower effective winding section of the rotor, the lower radial end of the left paramagnetic patch 3, the lower left sector-shaped magnetic steel ring 2B, and the lower magnetic guide ring 1B to form a closed loop. This structure transforms the traditional single magnetic circuit magnetic bearing topology into an upper and lower dual magnetic circuit with superior characteristics.

[0030] Figure 4 The rotor assembly diagram of the present invention shows that the rotor is disc-shaped, the inner radial side of the coil frame 5 is a hollow ring, the outer radial side is convex, and there is a vertical groove symmetrically connected through the center on each of the left and right axial end faces; the left front ear-shaped winding 4B and the left rear ear-shaped winding 4A are wound in the left circumferential flange and the left radial groove through the center of the coil frame 5; similarly, the right front ear-shaped winding 8B and the right rear ear-shaped winding 8A are wound in the right circumferential flange and the right radial groove through the center of the coil frame 5, forming a left-right symmetrical rotor structure with "windings on the outside and frame on the inside", which avoids the oscillation of the rotor during rotation caused by the different forces acting on the coils due to the high magnetic flux density at both ends and the low density in the middle of the air gap.

[0031] Figure 5 The diagram shows the force distribution of the working windings in the rotor of this invention. When the working windings in the upper and lower air gap magnetic fields are energized, they generate Lorentz forces of equal magnitude. The upper and lower ends of each lug-shaped coil are subjected to forces in opposite directions, forming a pair of force couples that drive the rotor to rotate. The rotating magnetic bearing detects the rotor's angular displacement through a servo component and dynamically adjusts the magnitude and direction of the coil current in real time, driving the rotor to rotate around the shaft with large angles and high precision.

[0032] Figure 6 In the rotating magnetic bearing stator of this embodiment of the invention, two sector-shaped magnetic steel rings are installed inside the magnetic isolation ring with the same rotation axis and the same center. The inner diameter of the magnetic isolation ring is the same as the outer diameter of the sector-shaped magnetic steel ring, and they are fully and closely fitted and installed as a whole to form the magnetic steel-magnetic isolation component.

[0033] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A moving-coil type dual-magnetic-circuit axially magnetized Lorentz force magnetic bearing, mainly composed of a left stator assembly, a right stator assembly, and a rotor assembly, characterized in that: The left stator assembly mainly includes: a left upper magnetic ring (1A), a left upper sector-shaped magnetic ring (2A), a left magnetic isolation ring (6), a left lower magnetic ring (1B), a left lower sector-shaped magnetic ring (2B), and a left paramagnetic patch (3); The right stator assembly mainly includes: a right upper magnetic ring (11A), a right upper sector-shaped magnetic ring (7A), a right magnetic isolation ring (10), a right lower magnetic ring (11B), a right lower sector-shaped magnetic ring (7B), and a right paramagnetic patch (9); The rotor assembly mainly includes: a left front ear-shaped winding (4B), a left rear ear-shaped winding (4A), a right front ear-shaped winding (8B), a right rear ear-shaped winding (8A), and a coil frame (5). The upper left sector-shaped magnetic steel ring (2A) and the lower left sector-shaped magnetic steel ring (2B) in the left stator assembly are coaxially and centrally assembled with the left magnetic isolation ring (6). The outer circumferential curved surface of the upper left sector-shaped magnetic steel ring (2A) and the lower left sector-shaped magnetic steel ring (2B) is bonded to the inner circumferential curved surface of the left magnetic isolation ring (6) to form the left magnet-magnetic isolation ring component. The left end face of the left magnet-magnetic isolation ring component is coaxially and centrally assembled with the right end face of the upper left magnetic guide ring (1A) and the lower left magnetic guide ring (1B). The right end face of the left magnet-magnetic isolation ring component is coaxially and tightly bonded to the left end face of the left paramagnetic patch (3) as one unit. The upper right sector-shaped magnetic steel ring (7A) and the lower right sector-shaped magnetic steel ring (7B) in the right stator assembly are coaxially and centrally assembled with the right magnetic isolation ring (10). The outer circumferential curved surface of the upper right sector-shaped magnetic steel ring (7A) and the lower right sector-shaped magnetic steel ring (7B) is bonded to the inner circumferential curved surface of the right magnetic isolation ring (10) to form the right magnetic steel-magnetic isolation ring component. The right end face of the right magnetic steel-magnetic isolation ring component is coaxially and centrally assembled with the left end face of the upper right magnetic guide ring (11A) and the lower right magnetic guide ring (11B). The left end face of the right magnetic steel-magnetic isolation ring component is coaxially and tightly bonded to the right end face of the right paramagnetic patch (9) as a whole. The upper left magnetic guide ring (1A) is located at the upper radial end of the left magnet-insulating ring component and the left paramagnetic patch (3). The inner axial end face of the upper left magnetic guide ring (1A) is fully attached to the left axial end face of the upper left fan-shaped magnet ring (2A) and fastened with screws. The lower left magnetic guide ring (1B) is located at the lower radial end of the left magnet-insulating ring component and the left paramagnetic patch (3). The inner axial end face of the lower left magnetic guide ring (1B) is fully attached to the left axial end face of the lower left fan-shaped magnet ring (2B) and fastened with screws to form the left stator assembly. The upper right magnetic guide ring (11A) is located at the upper radial end of the right magnet-insulating ring component and the right paramagnetic patch (9). The inner axial end face of the upper right magnetic guide ring (11A) is fully attached to the right axial end face of the upper right fan-shaped magnet ring (7A) and fastened with screws. The lower right magnetic guide ring (11B) is located at the lower radial end of the right magnet-insulating ring component and the right paramagnetic patch (9). The inner axial end face of the lower right magnetic guide ring (11B) is fully attached to the left axial end face of the lower right fan-shaped magnet ring (7B) and fastened with screws to form the right stator assembly. The upper left magnetic ring (1A) and lower left magnetic ring (1B) in the left stator assembly are connected to the upper right magnetic ring (11A) and lower right magnetic ring (11B) in the right stator assembly by array screws to form a complete stator assembly of moving coil type double magnetic circuit axially magnetized rotating Lorentz force magnetic bearing. The left front ear-shaped winding (4B) and the left rear ear-shaped winding (4A) in the rotor assembly are located on the left end face of the coil frame (5) and are located on the right side of the left paramagnetic patch (3) with a certain distance between them; the right front ear-shaped winding (8B) and the right rear ear-shaped winding (8A) are located on the right end face of the coil frame (5) and are located on the left side of the right paramagnetic patch (9) with a certain distance between them.

2. The moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing according to claim 1, characterized in that: In the rotating magnetic bearing, two magnetic rings in each axial layer are locked together with screws, forming an inverted saddle shape. There are two grooves on the radial inner side of the saddle surface, and the two grooves are arranged at intervals to sweep the circumferential curved surface of the magnetic ring. The inner and outer diameters of the paramagnetic patch are the same as those of the fan-shaped magnetic steel ring, and the inner and outer diameters of the magnetic isolation components on the left and right fan surfaces inside the magnetic isolation ring are the same as those of the fan-shaped magnetic steel ring.

3. The moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing according to claim 1, characterized in that: The rotor assembly is disc-shaped. The inner radial side of the coil frame (5) is hollow boss-shaped, and the outer radial side is convex. There is a vertical groove that is symmetrically connected through the center on each of the left and right axial end faces. The left front ear-shaped winding (4B) and the left rear ear-shaped winding (4A) are wound in the left circumferential flange and the left radial groove through the center of the coil frame (5). The right front ear-shaped winding (8B) and the right rear ear-shaped winding (8A) are wound in the right circumferential flange and the right radial groove through the center of the coil frame (5). The coil frame (5) and the four series closed coils form a centrally symmetrical rotor assembly structure with the windings on the outside and the frame on the inside. Its structural advantage is to avoid the air gap magnetic resistance affecting the axial air density attenuation, which would cause the four series coils to be subjected to inconsistent forces and cause the rotor to oscillate during rotation.

4. The moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing according to claim 1, characterized in that: The upper left fan-shaped magnetic steel ring (2A), upper right fan-shaped magnetic steel ring (7A), lower left fan-shaped magnetic steel ring (2B), and lower right fan-shaped magnetic steel ring (7B) are fan-shaped with the same circumferential arc segment. They are made of permanent magnet alloy material with equal axial magnetization thickness. The axially magnetized magnetic steel rings have less magnetic leakage on the radial inner and outer arc surfaces, avoiding diffusion of the air gap magnetic flux and thus reducing its uniformity. The magnetization direction of the upper left fan-shaped magnetic steel ring (2A) and the upper right fan-shaped magnetic steel ring (7A) is left S and right N. In the upper magnetic circuit, the magnetic flux passes sequentially through the upper left fan-shaped magnetic steel ring (2A), the left paramagnetic patch (3A), and the upper right fan-shaped magnetic steel ring (7A). The upper radial end, the upper effective winding section of the rotor, the upper radial end of the right paramagnetic patch (9), the upper right fan-shaped magnetic steel ring (7A) and the upper left magnetic guide ring (1A) form a closed loop; the lower left fan-shaped magnetic steel ring (2B) and the lower right fan-shaped magnetic steel ring (7B) are magnetized in the direction of left N and right S. In the lower magnetic circuit, the magnetic flux passes through the lower right fan-shaped magnetic steel ring (7B), the lower radial end of the right paramagnetic patch (9), the lower effective winding section of the rotor, the lower radial end of the left paramagnetic patch (3), the lower left fan-shaped magnetic steel ring (2B) and the lower left magnetic guide ring (1B) in sequence to form a closed loop.

5. The moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing according to claim 1, characterized in that: The depth of the groove on the axial end face of the coil skeleton (5) inside the rotor assembly is the same as the thickness of a single coil winding. The inner and outer diameters of its radial flange are the same as the size of the circumferential semicircular section of the coil. The hollow circle on the radial inner side is mechanically fixed to the shaft for large-angle motorized rotation. The inner diameter of the circumferential semicircular section of the ear-shaped coil inside the rotor assembly is larger than the outer diameter of the fan-shaped magnetic steel ring, so as to avoid interference torque generated by the coil in the non-working section of the circumferential section, which suppresses the rotor control accuracy. The brass coil is neatly glued in the grooves on both sides of the axial direction and the flanges on both sides of the coil skeleton in a double parallel winding manner to form four series closed ear-shaped windings. Its external symmetrical rotor assembly structure makes the working windings symmetrically close to the magnetic steel rings on both sides. When acting on the high magnetic density area of ​​the air gap, it can output a larger torque under the same current, effectively reducing the current power consumption of the rotating Lorentz force magnetic bearing.

6. The moving-coil dual-magnetic-circuit axially magnetized rotating Lorentz force magnetic bearing according to any one of claims 1-4, characterized in that: The air gap magnetic flux density in the upper and lower dual magnetic circuits is made equal. After each closed loop-shaped coil is energized, the radial upper and lower working winding segments act on the upper and lower magnetic fields with equal magnitude and opposite direction, forming a force couple to drive the rotor to rotate. The rotating magnetic bearing detects the rotor angular displacement through the servo component and dynamically adjusts the magnitude and direction of the coil current in real time to ensure that the rotor rotates around the axis with high precision and stability in an approximately 1π space, which facilitates the platform to complete target tracking and aiming.

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