CN111917338A - High-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor - Google Patents
High-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor Download PDFInfo
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- CN111917338A CN111917338A CN202010802017.4A CN202010802017A CN111917338A CN 111917338 A CN111917338 A CN 111917338A CN 202010802017 A CN202010802017 A CN 202010802017A CN 111917338 A CN111917338 A CN 111917338A
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Abstract
The invention relates to the technical field of variable frequency motors, in particular to a high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor, which comprises a motor box, a permanent magnet rotor and a superconducting stator, wherein the motor box is provided with a motor shaft; because of the high-temperature superconducting mixing and magnetic suspension characteristics of the motor, the motor is extremely sensitive to the change of the operation environment, the temperature of a superconducting stator needs to be controlled, and the heat transfer of the environment temperature under the practical working condition is extremely easy to influence the high-temperature superconducting state in the motor, so that the superconducting state of the motor is damaged; therefore, the superconducting ring arranged in the superconducting rotor is ensured to be in a stable high-temperature superconducting state through the wrapping structure of the ring cylinder on the superconducting ring, and the temperature change generated by heating liquid nitrogen is reduced through the vacuum cavity between the coating covered on the surface of the ring cylinder and the machine box, so that the high-temperature superconducting state of the superconducting stator in the motor is maintained, the magnetic suspension running state of the permanent magnet rotor is ensured, and the using effect of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor is improved.
Description
Technical Field
The invention relates to the technical field of variable frequency motors, in particular to a high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor.
Background
The high-temperature superconductivity is a superconductivity phenomenon generated by substances with relatively higher critical temperature than other superconductivity substances in the environment of liquid nitrogen, when the permanent magnet is close to the high-temperature superconductor, part of magnetic lines of force of the permanent magnet enter the superconductor, so that the permanent magnet is suspended without being controlled, and the high-temperature superconductivity has the characteristics of no friction and low loss when being applied to a main shaft driven by a motor; the introduction of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor can be seen in the integrated energy efficiency analysis and test [ J ] of the magnetic suspension high-speed permanent magnet synchronous motor in the aspects of the Chinese philosophy and the like, and the technology and the product for military and civilian use, 2017(No.12), 118 and 119.
The characteristics of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor are very sensitive to parameter changes of the operation environment under the condition of enhancing the performance of the motor, the temperature of a superconducting stator needs to be controlled so as to ensure that a stable state of magnetic flux is generated under the action of a winding of the superconducting stator, and the heat transfer of the environment temperature under practical working conditions easily influences the high-temperature superconducting state in the motor, so that the operation effect of the motor under the high-temperature superconducting state is further influenced.
Some technical schemes related to a high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor also appear in the prior art, for example, a chinese patent with application number 2009103129070 discloses a hybrid high-temperature superconducting linear magnetic suspension synchronous motor, which comprises a high-temperature superconducting linear synchronous motor composed of a double-side stator mounted on a rack and a high-temperature superconducting coil mover positioned between the stators, wherein the double-side stator is symmetrical with respect to the high-temperature superconducting coil mover, and is characterized in that the motor further comprises a permanent magnet track stator and a high-temperature superconducting block magnet suspension mover positioned above the permanent magnet track stator, and the high-temperature superconducting coil mover is mounted on the high-temperature superconducting block magnet suspension mover; the technical scheme organically combines the high-temperature superconducting linear synchronous motor and the high-temperature superconducting magnetic suspension mechanism, is highly integrated, realizes frictionless suspension propulsion of the linear motor, has large thrust, small loss, simple control, no need of guide control, and relatively small volume and weight, and can meet the requirements of some special application occasions such as magnetic suspension emission; however, the technical scheme does not solve the problem that the motor is easily influenced by the environmental temperature in the actual working condition, and the high-temperature superconducting state operation condition is damaged by heat transfer from the motor body to the elements in the motor.
In view of the above, in order to overcome the above technical problems, the present invention provides a high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor, which adopts a special hemostat structure, and solves the above technical problems.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor, which ensures that a superconducting ring is in a stable high-temperature superconducting state through a superconducting ring arranged in a superconducting rotor and a wrapping structure of a ring cylinder on the superconducting ring, reduces the temperature change generated by heating liquid nitrogen through a vacuum cavity between a coating covered on the surface of the ring cylinder and a machine box, maintains the high-temperature superconducting state of a superconducting stator in the motor, ensures the magnetic suspension running state of a permanent magnet rotor, and improves the using effect of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor.
The invention relates to a high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor which comprises a motor box, a permanent magnet rotor and a superconducting stator; a superconducting stator is arranged in the machine box, and a permanent magnet rotor is arranged at the center of the superconducting stator; the center of the permanent magnet rotor is provided with a main shaft, and the main shaft extends out of the end part of the machine box; the superconducting stator comprises superconducting rings and superconducting blocks, the superconducting rings are distributed in the machine box in a laminated mode, and gaps are formed between adjacent end faces of the superconducting rings; the superconducting blocks are distributed on the inner wall of the superconducting ring in a surrounding manner, and flanges are arranged on the end faces, facing the permanent magnet rotor, of the superconducting blocks; the superconducting block is provided with a winding, and the winding is connected to an electrode of the machine box along the end part direction of the superconducting ring; a ring cylinder is arranged on the circumference of the superconducting ring, the superconducting ring is wrapped by the ring cylinder, and the ring cylinder is in closed contact with the superconducting blocks protruding from the superconducting ring; liquid nitrogen is filled in the ring cylinder, and white coatings are covered on the inner surface and the outer surface of the ring cylinder; a vacuum cavity is arranged between the outer wall of the ring cylinder and the inner wall of the case, and felt rings are arranged at the upper end and the lower end of the vacuum cavity; the felt ring fixes the ring cylinder in the machine box; when the motor works, the winding is connected with current, so that a magnetic field is formed by the superconducting blocks wound by the winding along the direction of the superconducting ring, the superconducting blocks act on the permanent magnet rotor to enable the permanent magnet rotor to be suspended to the central position of the superconducting ring, the effect of the magnetic field is changed by controlling the change of the current in the winding, the permanent magnet rotor drives the spindle in the permanent magnet rotor to rotate, the running effect of the motor is achieved, the motor is extremely sensitive to the parameter change of the running environment under the condition of enhancing the performance of the motor due to the high-temperature superconducting mixing and magnetic suspension characteristics of the motor, the temperature of the superconducting stator needs to be controlled to ensure that the stable state of magnetic flux is generated under the action of the winding, and the high-temperature superconducting state in the motor is extremely easily influenced by the heat transfer of the environment temperature; therefore, the superconducting ring is wrapped by the ring cylinder through the superconducting ring arranged in the superconducting stator, the high-temperature superconducting state of the superconducting ring is maintained under the action of liquid nitrogen, a heat conduction path is isolated through the vacuum cavity between the film cylinder and the machine box, the closed machine box isolates a heat convection path, the white coating on the surface of the film cylinder weakens the heat radiation effect, and only under the connection action of the felt ring at the end part of the vacuum cavity, a trace amount of heat is transferred into the liquid nitrogen of the ring cylinder; the superconducting ring arranged in the superconducting rotor is utilized, the superconducting ring is ensured to be in a stable high-temperature superconducting state through the wrapping structure of the ring cylinder on the superconducting ring, and the temperature change generated by heating of liquid nitrogen is reduced through the coating covered on the surface of the ring cylinder and the vacuum cavity between the machine boxes, so that the high-temperature superconducting state of the superconducting stator in the motor is maintained, the magnetic suspension running state of the permanent magnet rotor is ensured, and the using effect of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor is improved.
Preferably, narrow holes are formed in the felt ring, the narrow holes are distributed along the axial direction of the felt ring, and the narrow holes are communicated on the end face, close to the end part of the machine box, of the felt ring; the end surface of the felt ring is in contact with the inner wall of the end surface of the case; in the running process of the superconducting stator driving the permanent magnet rotor, the micro-change of the liquid nitrogen temperature in the ring cylinder can cause the superconducting state of winding resistance on the superconducting stator to generate corresponding change, the change of the resistance value can cause the magnetic field driving the permanent magnet rotor to generate fluctuation, so that the position of the permanent magnet rotor shifts, and the permanent magnet rotor reacts on the superconducting rotor to cause the superconducting ring to generate radial displacement, and then the ring cylinder collides with the inner wall of the machine box to further interfere the stability of the liquid nitrogen state in the ring cylinder; according to the invention, through the narrow holes arranged in the felt rings, the deformation degree of the felt rings is enhanced, the collision between the ring cylinder and the machine box caused by the radial displacement of the superconducting rings is weakened, the narrow holes are convenient for the felt rings to generate matched expansion deformation under the high temperature difference between the contacted ring cylinder and the machine box, and the fixed position of the ring cylinder in the machine box is stabilized through the contact between the end surfaces of the felt rings and the end surfaces of the machine box, so that the superconducting rings wrapped by the ring cylinder are ensured to be positioned, and the operation stability of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor is improved.
Preferably, a hollow groove is formed in the superconducting block, and the bottom of the superconducting block is fixed on the superconducting ring; the empty groove extends to the inside of the superconducting ring along the superconducting block; a grid ring is arranged in a gap between the stacked superconducting rings and is fixed inside the ring cylinder; the electromagnetic field generated in the high-temperature superconducting state acts on the winding through the low-temperature effect of the superconducting stator, so that the winding enters the high-temperature superconducting state, the control effect of the superconducting stator on the magnetic field effect of current is further improved, heat dissipation can be generated by heat transfer between the superconducting ring and the superconducting blocks, the temperature effect of liquid nitrogen in the ring cylinder is dissipated in the structure of the superconducting stator, and the low-temperature effect on the winding is reduced; the invention reduces the effective volume of the superconducting stator structure by arranging the empty slot communicated between the superconducting block and the superconducting rings, further reduces the dissipation amount of the low-temperature effect of liquid nitrogen in the ring cylinder transmitted to the winding, concentrates the control action on the winding temperature, enhances the temperature control effect of a single superconducting ring by the grid ring in the gap between the superconducting rings, and stabilizes the structure of the ring cylinder, thereby stabilizing the high-temperature superconducting state of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor.
Preferably, the surface of the superconducting block is provided with a glue stick, and flanges on two sides of the superconducting block are provided with rolling grooves; the glue stick is rotatably arranged in the rolling groove, and a gap is reserved between the glue stick and the inner wall of the rolling groove; in the starting process of the motor, the permanent magnet rotor is suspended by a magnetic field generated by a winding on the superconducting stator and can simultaneously rotate along with the permanent magnet rotor, the sliding of the permanent magnet rotor on the superconducting block can affect the surface quality of the permanent magnet rotor and the superconducting block, the magnetic field is controlled by adjusting the current state in the winding to firstly suspend the permanent magnet rotor, an additional control step for winding current is added, and the quick starting effect of the motor is weakened; according to the invention, the rubber rod is rotatably arranged in the rolling groove through the rolling groove arranged on the surface of the superconducting block, so that the permanent magnet rotor and the rubber rod are in rolling contact in the starting process of the motor, the surface abrasion of the permanent magnet rotor and the rubber rod is avoided, the colloid material of the rubber rod buffers the contact interaction between the permanent magnet rotor and the superconducting block, and the heat transfer between the superconducting block and the permanent magnet rotor is isolated, thereby improving the use effect of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor.
Preferably, a bearing box is arranged on the machine box and is positioned at the end part of the machine box, which extends out of the main shaft; a pair of electromagnets is arranged in the bearing box, the electromagnets are distributed at the upper end and the lower end of the bearing box, and the electromagnets are electrically connected with the electrodes on the machine box; a rod frame connected with the electromagnets is arranged between the electromagnets, and a bearing installed in a sliding manner is arranged in the rod frame; a magnetic induction sheet is arranged on the surface of the bearing facing the electromagnet; under the action of an electromagnetic field, a permanent magnet rotor in the machine box is suspended to the central position of the superconducting stator, and simultaneously, the position of the main shaft is driven to change, so that a bearing of the motor correspondingly changes, and the axial precision of the main shaft can be influenced by the bearing under the driving of the magnetic suspension force of the permanent magnet rotor; the invention uses the electromagnet arranged in the bearing box and the rod frame connected with the electromagnet, uses the bearing arranged on the rod frame in a sliding way, and makes the position of the bearing between the electromagnets changed by the magnetic field generated by the electromagnet after the motor is started to act with the magnetic induction sheet outside the bearing to match the position change of the permanent magnet rotor, thereby avoiding the interference of the bearing on the axial progress of the main shaft under the drive of the permanent magnet rotor, and further stabilizing the running state of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor.
Preferably, a pair of ring plates are arranged on the periphery of the electromagnet and fixed on the inner wall of the bearing box; the electromagnet is in sliding contact with the inner wall of the bearing box, and the electromagnet rotates in the bearing box along the ring plate; in the process of converting the permanent magnet rotor in the machine box into a magnetic suspension state, the suspension lifting direction of the permanent magnet rotor is difficult to control, and the moving direction of the permanent magnet rotor is limited by a bearing which is slidably arranged in the rod frame; according to the invention, the annular plate arranged in the bearing box is matched with the electromagnet in sliding contact with the inner wall of the bearing box, so that the electromagnet is rotatably arranged in the bearing box, and further the permanent magnet rotor is driven by the spindle to rotate in the bearing box under different suspension angles of magnetic suspension acting force, so that the lifting angle of the bearing in the rod frame is matched with the suspension lifting process of the permanent magnet rotor, and the running state of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor is ensured.
The invention has the following beneficial effects:
1. the superconducting ring is arranged in the superconducting rotor, and is ensured to be in a stable high-temperature superconducting state through a wrapping structure of the ring cylinder on the superconducting ring; the narrow holes arranged in the felt rings enhance the deformation degree of the felt rings and stabilize the fixed position of the ring cylinder in the case; the empty groove communicated between the superconducting blocks and the superconducting rings is arranged, the control effect on the winding temperature is centralized, and the grid rings in the gaps among the superconducting rings enhance the temperature control effect on the single superconducting rings.
2. The rubber rod is rotatably arranged in the rolling groove on the surface of the superconducting block, so that the surfaces of the superconducting block and the permanent magnet rotor are prevented from being abraded, and the heat transfer between the superconducting block and the permanent magnet rotor is isolated; electromagnets arranged in the bearing box and a bearing slidably mounted on the rod frame enable the position of the bearing between the electromagnets to be changed to match the position change of the permanent magnet rotor; the ring plate arranged in the bearing box is matched with the electromagnet in sliding contact with the inner wall of the bearing box, so that the lifting angle of the bearing in the rod frame is matched with the suspension lifting process of the permanent magnet rotor.
Drawings
The invention is further described with reference to the following figures and embodiments.
FIG. 1 is a perspective view of a high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor according to the present invention;
FIG. 2 is a cross-sectional view of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor according to the present invention;
FIG. 3 is a perspective view of a superconducting stator component of the present invention;
FIG. 4 is a perspective view of a superconducting block assembly according to the present invention;
FIG. 5 is a perspective view of a bearing cartridge component of the present invention;
FIG. 6 is an enlarged view of a portion of FIG. 1 at A;
FIG. 7 is an enlarged view of a portion of FIG. 2 at B;
in the figure: the superconducting permanent magnet motor comprises a machine box 1, a bearing box 11, an electromagnet 12, a rod frame 13, a bearing 14, a magnetic induction sheet 141, a ring plate 15, a permanent magnet rotor 2, a superconducting stator 3, a main shaft 4, a superconducting ring 5, a superconducting block 6, a flange 61, a winding 62, a hollow groove 63, a rubber rod 64, a rolling groove 65, a gap 7, a ring cylinder 8, a grid ring 81, a vacuum cavity 9, a felt ring 91 and a narrow hole 911.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 7, the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor according to the present invention includes a housing 1, a permanent magnet rotor 2 and a superconducting stator 3; a superconducting stator 3 is arranged in the machine box 1, and a permanent magnet rotor 2 is arranged in the center of the superconducting stator 3; a main shaft 4 is arranged in the center of the permanent magnet rotor 2, and the main shaft 4 extends out of the end part of the machine box 1; the superconducting stator 3 comprises superconducting rings 5 and superconducting blocks 6, the superconducting rings 5 are distributed inside the machine box 1 in a laminated mode, and gaps 7 are formed between adjacent end faces of the superconducting rings 5; the superconducting blocks 6 are distributed on the inner wall of the superconducting ring 5 in a surrounding way, and flanges 61 are arranged on the end faces, facing the permanent magnet rotor 2, of the superconducting blocks 6; the superconducting block 6 is provided with a winding 62, and the winding 62 is connected to an electrode of the machine box 1 along the end direction of the superconducting ring 5; the circumference of the superconducting ring 5 is provided with a ring cylinder 8, the superconducting ring 5 is wrapped by the ring cylinder 8, and the ring cylinder 8 is in closed contact with the superconducting blocks 6 protruding from the superconducting ring 5; liquid nitrogen is filled in the annular cylinder 8, and white coatings are covered on the inner surface and the outer surface of the annular cylinder 8; a vacuum cavity 9 is arranged between the outer wall of the ring cylinder 8 and the inner wall of the case 1, and felt rings 91 are arranged at the upper end and the lower end of the vacuum cavity 9; the felt ring 91 fixes the ring cylinder 8 inside the case 1; when the motor works, the winding 62 is connected with current, so that the superconducting block 6 wound by the winding 62 forms a magnetic field along the direction of the superconducting ring 5, the magnetic field acts on the permanent magnet rotor 2 to be suspended to the central position of the superconducting ring 5, and the effect of the magnetic field is changed by controlling the change of the current in the winding 62, so that the permanent magnet rotor 2 drives the spindle 4 therein to rotate, thereby achieving the operation effect of the motor; therefore, the superconducting loop 5 is wrapped by the loop cylinder 8 through the superconducting loop 5 arranged in the superconducting stator 3, the high-temperature superconducting state of the superconducting loop 5 is maintained under the action of liquid nitrogen, a heat conduction path is isolated through the vacuum cavity 9 between the film cylinder and the machine box 1, the closed machine box 1 isolates a heat convection path, the white coating on the surface of the film cylinder weakens the heat radiation effect, and the trace heat transfer is enabled to act into the liquid nitrogen of the loop cylinder 8 only under the connection action of the felt rings 91 at the end parts of the vacuum cavity 9; the superconducting ring 5 arranged in the superconducting rotor is utilized, the superconducting ring 5 is ensured to be in a stable high-temperature superconducting state through the wrapping structure of the ring cylinder 8 on the superconducting ring 5, and the temperature change generated by heating of liquid nitrogen is reduced through the vacuum cavity 9 between the coating covered on the surface of the ring cylinder 8 and the machine box 1, so that the high-temperature superconducting state of the superconducting stator 3 in the motor is maintained, the magnetic suspension running state of the permanent magnet rotor 2 is ensured, and the using effect of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor is improved.
In one embodiment of the present invention, the felt ring 91 is provided with narrow holes 911, the narrow holes 911 are distributed along the axial direction of the felt ring 91, and the narrow holes 911 penetrate through the end surface of the felt ring 91 close to the end of the case 1; the end surface of the felt ring 91 is contacted with the inner wall of the end surface of the case 1; in the running process of the superconducting stator 3 driving the permanent magnet rotor 2, the micro-change of the liquid nitrogen temperature in the annular cylinder 8 can cause the superconducting state of the resistance of the winding 62 on the superconducting stator 3 to be correspondingly changed, the change of the resistance can cause the magnetic field driving the permanent magnet rotor 2 to fluctuate, so that the position of the permanent magnet rotor 2 is deviated and reacts on the superconducting rotor, the superconducting ring 5 is caused to generate radial displacement, and then the annular cylinder 8 and the inner wall of the machine box 1 collide with each other, so that the stability of the liquid nitrogen state in the annular cylinder 8 is further disturbed; according to the invention, the deformation degree of the felt ring 91 is enhanced through the narrow hole 911 arranged in the felt ring 91, the collision between the ring cylinder 8 and the machine box 1 caused by the radial displacement of the superconducting ring 5 is weakened, the narrow hole 911 is convenient for the felt ring 91 to generate matched expansion deformation under the high temperature difference between the ring cylinder 8 and the machine box 1 which are in contact, and the fixed position of the ring cylinder 8 in the machine box 1 is stabilized through the contact between the end surface of the felt ring 91 and the end surface of the machine box 1, so that the superconducting ring 5 wrapped by the ring cylinder 8 is ensured to be positioned, and the operation stability of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor is improved.
As an embodiment of the present invention, a hollow groove 63 is provided inside the superconducting block 6, and the bottom of the superconducting block 6 is fixed to the superconducting ring 5; the empty groove 63 extends along the superconducting block 6 to the inside of the superconducting ring 5; a grid ring 81 is arranged in a laminated gap 7 between the superconducting rings 5, and the grid ring 81 is fixed in the annular cylinder 8; the electromagnetic field generated in the high-temperature superconducting state acts on the winding 62 through the low-temperature effect of the superconducting stator 3, so that the winding 62 enters the high-temperature superconducting state, the control effect of the superconducting stator on the magnetic field effect of current is further improved, heat dissipation is generated by heat transfer between the superconducting ring 5 and the superconducting block 6, the temperature effect of liquid nitrogen in the ring cylinder 8 is dissipated in the structure of the superconducting stator 3, and the low-temperature effect on the winding 62 is reduced; according to the invention, through the empty groove 63 communicated between the superconducting block 6 and the superconducting ring 5, the effective volume of the superconducting stator 3 structure is reduced, so that the dissipation amount of liquid nitrogen low-temperature effect in the ring cylinder 8 transferred to the winding 62 is reduced, the control effect on the temperature of the winding 62 is concentrated, the grid ring 81 in the gap between the superconducting rings 5 enhances the temperature control effect on a single superconducting ring 5, and the structure of the ring cylinder 8 is stabilized, thereby stabilizing the high-temperature superconducting state of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor.
As an embodiment of the present invention, a glue stick 64 is disposed on the surface of the superconducting block 6, and rolling grooves 65 are disposed on the flanges 61 on both sides of the superconducting block 6; the glue stick 64 is rotatably arranged in the rolling groove 65, and a gap is reserved between the glue stick 64 and the inner wall of the rolling groove 65; in the starting process of the motor, the permanent magnet rotor 2 is suspended by a magnetic field generated by a winding 62 on the superconducting stator 3, the sliding of the permanent magnet rotor 2 on the superconducting block 6 can affect the surface quality of the permanent magnet rotor and the superconducting block along with the rotation of the permanent magnet rotor 2, the magnetic field is controlled by adjusting the current state in the winding 62 to suspend the permanent magnet rotor 2 firstly, an additional control step for the current of the winding 62 is added, and the quick starting effect of the motor is weakened; according to the invention, the rubber rod 64 is rotatably arranged in the rolling groove 65 through the rolling groove 65 arranged on the surface of the superconducting block 6, so that the permanent magnet rotor 2 and the rubber rod 64 are in rolling contact in the starting process of the motor, the surface abrasion of the permanent magnet rotor 2 and the rubber rod 64 is avoided, the colloid material of the rubber rod 64 buffers the contact interaction between the permanent magnet rotor 2 and the superconducting block 6, and the heat transfer between the superconducting block 6 and the permanent magnet rotor 2 is isolated, so that the use effect of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor is improved.
As an embodiment of the invention, a bearing box 11 is arranged on the machine box 1, and the bearing box 11 is positioned at the end part of the machine box 1 where the main shaft 4 extends; a pair of electromagnets 12 are arranged inside the bearing box 11, the electromagnets 12 are distributed at the upper end and the lower end of the bearing box 11, and the electromagnets 12 are electrically connected with the electrodes on the machine box 1; a rod frame 13 connected with the electromagnets 12 is arranged between the electromagnets, and a bearing 14 installed in a sliding manner is arranged in the rod frame 13; a magnetic induction sheet 141 is arranged on the surface of the bearing 14 facing the electromagnet 12; under the action of an electromagnetic field, the permanent magnet rotor 2 in the machine box 1 is suspended to the central position of the superconducting stator 3, and simultaneously drives the position of the main shaft 4 to change, so that a bearing 14 of the motor correspondingly changes, and the bearing 14 can influence the axial precision of the main shaft 4 under the driving of the magnetic suspension force of the permanent magnet rotor 2; according to the invention, through the electromagnet 12 arranged in the bearing box 11 and the rod frame 13 connected with the electromagnet 12, the bearing 14 arranged on the rod frame 13 in a sliding manner is utilized, and the position of the bearing 14 among the electromagnets 12 is changed by the magnetic field generated by the electromagnet 12 after the motor is started and the magnetic induction sheet 141 on the outer side of the bearing 14 to match the position change of the permanent magnet rotor 2, so that the interference of the bearing 14 on the axial progress of the main shaft 4 under the driving of the permanent magnet rotor 2 is avoided, and the running state of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor is stabilized.
As an embodiment of the present invention, a pair of ring plates 15 is disposed on the circumference of the electromagnet 12, and the ring plates 15 are fixed on the inner wall of the bearing box 11; the electromagnet 12 is in sliding contact with the inner wall of the bearing box 11, and the electromagnet 12 rotates in the bearing box 11 along the ring plate 15; the permanent magnet rotor 2 in the case 1 is difficult to control the suspension lifting direction during the process of converting into the magnetic suspension state, and the bearing 14 slidably mounted in the rod frame 13 limits the moving direction; according to the invention, the annular plate 15 arranged in the bearing box 11 is matched with the electromagnet 12 in sliding contact with the inner wall of the bearing box 11, so that the electromagnet 12 is rotatably arranged in the bearing box 11, and further, the electromagnet 12 is driven by the main shaft 4 to rotate in the bearing box 11 under different suspension angles of magnetic suspension acting force, so that the lifting angle of the bearing 14 in the rod frame 13 is matched with the suspension lifting process of the permanent magnet rotor 2, and the running state of the high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor is ensured.
When the motor works, the winding 62 is connected with current, so that the superconducting blocks 6 wound by the winding 62 form a magnetic field along the direction of the superconducting ring 5, the magnetic field acts on the permanent magnet rotor 2 to be suspended to the central position of the superconducting ring 5, the effect of the magnetic field is changed by controlling the change of the current in the winding 62, the permanent magnet rotor 2 drives the spindle 4 therein to rotate, and the operation effect of the motor is achieved; the superconducting ring 5 is wrapped by the ring cylinder 8 through the superconducting ring 5 arranged in the superconducting stator 3, the high-temperature superconducting state of the superconducting ring 5 is maintained under the action of liquid nitrogen, a heat conduction path is isolated through the vacuum cavity 9 between the film cylinder and the machine box 1, the closed machine box 1 blocks a heat convection path, the white coating on the surface of the film cylinder weakens the heat radiation effect, and only under the connecting action of the felt ring 91 at the end part of the vacuum cavity 9, a small amount of heat is transferred to the liquid nitrogen of the ring cylinder 8; the narrow hole 911 arranged in the felt ring 91 enhances the deformation degree of the felt ring 91, weakens the collision between the ring cylinder 8 and the case 1 caused by the radial displacement of the superconducting ring 5, and the narrow hole 911 is convenient for the felt ring 91 to generate matched expansion deformation under the high temperature difference between the contacted ring cylinder 8 and the case 1, stabilizes the fixed position of the ring cylinder 8 in the case 1 through the contact between the end surface of the felt ring 91 and the end surface of the case 1, and ensures the positioning of the superconducting ring 5 wrapped by the ring cylinder 8; the empty groove 63 communicated between the superconducting blocks 6 and the superconducting rings 5 reduces the effective volume of the superconducting stator 3 structure, further reduces the dissipation amount of the liquid nitrogen low-temperature effect in the ring cylinder 8 transferred to the winding 62, concentrates the control effect on the temperature of the winding 62, enhances the temperature control effect on a single superconducting ring 5 by the grid rings 81 in the gap between the superconducting rings 5, and stabilizes the structure of the ring cylinder 8; the rolling groove 65 is formed in the surface of the superconducting block 6, the glue rod 64 is rotatably mounted in the rolling groove 65, so that the permanent magnet rotor 2 and the glue rod 64 are in rolling contact in the starting process of the motor, the surfaces of the permanent magnet rotor 2 and the glue rod 64 are prevented from being abraded, the colloid material of the glue rod 64 buffers the contact interaction between the permanent magnet rotor 2 and the superconducting block 6, and the heat transfer between the superconducting block 6 and the permanent magnet rotor 2 is isolated; the electromagnet 12 arranged in the bearing box 11 and the rod frame 13 connected with the electromagnet 12 are arranged, the bearing 14 arranged on the rod frame 13 in a sliding mode is utilized, and the position of the bearing 14 among the electromagnets 12 is changed by the action of a magnetic field generated by the electromagnet 12 after the motor is started and a magnetic induction sheet 141 on the outer side of the bearing 14, so that the position change of the bearing 14 is matched with the position change of the permanent magnet rotor 2, and the interference of the bearing 14 on the axial progress of the main shaft 4 under the driving of the permanent magnet rotor 2 is avoided; the ring plate 15 arranged in the bearing box 11 is matched with the electromagnet 12 in sliding contact with the inner wall of the bearing box 11, so that the electromagnet 12 is rotatably arranged in the bearing box 11, and further the permanent magnet rotor 2 drives the electromagnet 12 to rotate in the bearing box 11 through the main shaft 4 under different suspension angles of magnetic suspension acting force, so that the lifting angle of the bearing 14 in the rod frame 13 is matched with the suspension lifting process of the permanent magnet rotor 2.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor comprises a motor box (1), a permanent magnet rotor (2) and a superconducting stator (3); the method is characterized in that: a superconducting stator (3) is arranged in the machine box (1), and a permanent magnet rotor (2) is arranged in the center of the superconducting stator (3); a main shaft (4) is arranged in the center of the permanent magnet rotor (2), and the main shaft (4) extends out of the end part of the machine box (1); the superconducting stator (3) comprises superconducting rings (5) and superconducting blocks (6), the superconducting rings (5) are distributed inside the machine box (1) in a laminated mode, and gaps (7) are formed between adjacent end faces of the superconducting rings (5); the superconducting blocks (6) are distributed on the inner wall of the superconducting ring (5) in a surrounding manner, and flanges (61) are arranged on the end faces, facing the permanent magnet rotor (2), of the superconducting blocks (6); the superconducting block (6) is provided with a winding (62), and the winding (62) is connected to an electrode of the machine box (1) along the end part direction of the superconducting ring (5); a ring cylinder (8) is arranged on the circumference of the superconducting ring (5), the superconducting ring (5) is wrapped by the ring cylinder (8), and the ring cylinder (8) is in airtight contact with the superconducting blocks (6) protruding from the superconducting ring (5); liquid nitrogen is filled in the annular cylinder (8), and white coatings are covered on the inner surface and the outer surface of the annular cylinder (8); a vacuum cavity (9) is arranged between the outer wall of the ring cylinder (8) and the inner wall of the case (1), and felt rings (91) are arranged at the upper end and the lower end of the vacuum cavity (9); the felt ring (91) fixes the ring cylinder (8) in the machine box (1).
2. The high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor according to claim 1, characterized in that: narrow holes (911) are formed in the felt ring (91), the narrow holes (911) are distributed along the axial direction of the felt ring (91), and the narrow holes (911) are communicated on the end face, close to the end part of the case (1), of the felt ring (91); the end face of the felt ring (91) is in contact with the inner wall of the end face of the case (1).
3. The high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor according to claim 1, characterized in that: a hollow groove (63) is formed in the superconducting block (6), and the bottom of the superconducting block (6) is fixed on the superconducting ring (5); the empty groove (63) extends to the inside of the superconducting ring (5) along the superconducting block (6); a grid ring (81) is arranged in a laminated gap (7) between the superconducting rings (5), and the grid ring (81) is fixed in the ring barrel (8).
4. A high temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor according to claim 3, characterized in that: the surface of the superconducting block (6) is provided with a glue stick (64), and flanges (61) on two sides of the superconducting block (6) are provided with rolling grooves (65); the glue stick (64) is rotatably arranged in the rolling groove (65), and a gap is reserved between the glue stick (64) and the inner wall of the rolling groove (65).
5. The high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor according to claim 1, characterized in that: the bearing box (11) is arranged on the machine box (1), and the bearing box (11) is positioned at the extending end part of the main shaft (4) in the machine box (1); a pair of electromagnets (12) is arranged in the bearing box (11), the electromagnets (12) are distributed at the upper end and the lower end of the bearing box (11), and the electromagnets (12) are electrically connected with the electrodes on the machine box (1); a rod frame (13) connected with the electromagnets (12) is arranged between the electromagnets, and a bearing (14) installed in a sliding way is arranged in the rod frame (13); the surface of the bearing (14) facing the electromagnet (12) is provided with a magnetic induction sheet (141).
6. The high-temperature superconducting hybrid magnetic suspension permanent magnet variable frequency motor according to claim 5, characterized in that: a pair of ring plates (15) are arranged on the periphery of the electromagnet (12), and the ring plates (15) are fixed on the inner wall of the bearing box (11); the electromagnet (12) is in sliding contact with the inner wall of the bearing box (11), and the electromagnet (12) rotates in the bearing box (11) along the ring plate (15).
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Denomination of invention: A High Temperature Superconducting Hybrid Maglev Permanent Magnet Variable Frequency Motor Effective date of registration: 20221125 Granted publication date: 20210706 Pledgee: Wenling branch of the Industrial Commercial Bank of China Ltd. Pledgor: Zhejiang Chaoding electromechanical Co.,Ltd. Registration number: Y2022980023661 |