A high-speed motor for air spinning

Abstract

The present invention provides an air-spinning high-speed motor, comprising a rotating shaft and a stator, wherein a spinning cup is fixed at one end of the rotating shaft, and a thrust member for axially positioning the rotating shaft is provided at the other end; a radial magnetic suspension bearing and a hybrid magnetic suspension bearing composed of the radial magnetic suspension bearing and the axial magnetic suspension bearing are provided on the outer side of the rotating shaft; the radial magnetic suspension bearing and the hybrid magnetic suspension bearing support the rotating shaft between the electromagnets without contact. The present invention utilizes an active magnetic suspension bearing to support the air-spinning rotor without contact, so that the rotor can rotate at high speed, thereby effectively improving the quality of the spun yarn.

Description

Technical Field

[0001] The invention relates to the technical field of air-jet spinning, and in particular to an air-jet spinning high-speed motor. Background Art

[0002] Air-spinning machine, also known as rotor spinning machine, is a kind of free-end spinning equipment. It is a new spinning technology that uses airflow to condense and twist fibers in a high-speed rotating spinning cup to output yarn. It does not use spindles, but mainly relies on multiple components such as combing rollers, spinning cups, and twisting devices. Among them, the spinning cup is a small metal cup, and its rotation speed is more than 10 times higher than that of the combing roller. The centrifugal effect generated thereby discharges the air in the cup to the outside. Therefore, the rotation speed of the spinning cup directly determines the quality of the spinning, that is, the higher the rotation speed of the spinning cup, the better the quality of the spun yarn. The motor provides high-speed rotation power for the rotor. Therefore, the motor is a key component for providing power, and it is also a key component for ensuring the high-speed rotation of the rotor.

[0003] Accordingly, how to increase the rotation speed of the spinning cup and the motor rotor during the spinning process is a problem that those skilled in the art urgently need to solve. Summary of the invention

[0004] The object of the present invention is to provide an air-spinning high-speed motor, which utilizes an active magnetic bearing to support the air-spinning rotor without contact, so as to achieve high-speed rotation of the rotor.

[0005] The technical solution provided by the present invention is as follows:

[0006] An air-spinning high-speed motor comprises a rotating shaft and a stator, wherein a spinning cup is fixed at one end of the rotating shaft, and a thrust member for axially positioning the rotating shaft is provided at the other end;

[0007] A radial magnetic suspension bearing and a hybrid magnetic suspension bearing composed of the radial magnetic suspension bearing and the axial magnetic suspension bearing are provided on the outer side of the rotating shaft;

[0008] The radial magnetic bearing and the hybrid magnetic bearing support the rotating shaft between the electromagnets in a contactless manner.

[0009] This technical solution mainly uses radial magnetic suspension bearings and hybrid magnetic suspension bearings to realize contactless active control of the six degrees of freedom of the combined rotating body composed of a rotating shaft and a rotor for air-jet spinning fixedly assembled therewith. Among them, the specific six degrees of freedom are the axial high-speed rotation control around the motor shaft provided by the permanent magnet synchronous motor; the horizontal and vertical position control of the rotating shaft provided by the radial magnetic suspension bearing in the plane perpendicular to the axial direction of the rotating shaft; the horizontal and vertical position control of the rotating shaft provided by the radial magnetic suspension bearing part of the hybrid magnetic suspension bearing in the plane perpendicular to the axial direction of the rotating shaft, and the axial position control provided by the axial magnetic suspension bearing part of the hybrid magnetic suspension bearing. In this way, the rotor can rotate at a high speed with a loss far lower than that when using mechanical bearings. At the same time, the radial or axial disturbance force caused by the spinning process or by electromagnetic, mechanical structure, etc. during rotation is quickly and accurately compensated, so that the high-speed rotating rotor can be stably maintained at the position required by the spinning process.

[0010] Preferably, a cavity structure is provided in the rotating shaft at a position corresponding to the stator, the cavity structure is cylindrical, and a column is provided in the cylindrical cavity structure along the central axis direction of the rotating shaft;

[0011] The column is a radially magnetized cylindrical permanent magnet;

[0012] The cavity structure portion of the rotating shaft corresponding to the stator is made of a non-magnetic conductive material or a weakly magnetic conductive material;

[0013] The portion of the rotating shaft corresponding to the magnetic suspension bearing is made of magnetic conductive material.

[0014] Preferably, the stator is connected to the stator winding wound on the coil frame through an adhesive material;

[0015] The equivalent magnetic circuit air gap between the columnar permanent magnet and the stator is the sum of the wall thickness of the cavity structure, the radial air gap length between the outer surface of the cavity structure and the stator winding, and the radial thickness of the stator winding.

[0016] This technical solution is mainly due to the extremely high rotation speed of the spinning cup and the rotating shaft during the spinning process (maximum rotation speed ≧ 150000RPM). In order to reduce the hysteresis and eddy current losses generated by the high-speed rotating magnetic field in the stator, the stator is directly connected to the stator winding wound on the coil frame through an adhesive material, and there is no need to open a tooth slot on the stator for placing the stator winding. The structure is simple and easy to install. At the same time, the equivalent magnetic circuit air gap between the columnar permanent magnet and the stator is set to the wall thickness of the cavity structure and the radial air gap length between the outer surface of the cavity structure and the stator winding, as well as the sum of the radial thickness of the stator winding. This design makes the equivalent magnetic circuit air gap much larger than the equivalent magnetic circuit air gap of the stator structure with tooth slots, so the magnetic field density jointly generated by the columnar permanent magnet and the current in the stator winding will be much smaller than the magnetic field density corresponding to the stator structure with tooth slots, so that the hysteresis and eddy current losses generated by the high-speed rotating magnetic field in the stator are significantly reduced, thereby effectively improving the speed that the shaft can reach without overheating the motor.

[0017] Preferably, the radial magnetic bearing is composed of a magnetic pole ring, a permanent magnet ring, and a magnetic circuit closed ring to form a monopole magnetic pole structure;

[0018] At least four magnetic poles facing the rotating shaft are symmetrically distributed on the magnetic pole ring, and a first excitation winding is wound around each of the magnetic poles.

[0019] Preferably, the permanent magnet ring is located between the magnetic pole ring and the magnetic circuit closed ring;

[0020] The monopole magnetic pole structure is sleeved on the outside of the rotating shaft, and a first air gap is left between the monopole magnetic pole structure and the rotating shaft.

[0021] In the present technical solution, the magnetic circuit closed loop is poleless and only provides a magnetic circuit closed path. Since the direction of the magnetic field in the magnetic circuit is always in a single direction and there is no reverse magnetization, the unipolar magnetic pole structure with permanent magnet bias can significantly reduce the hysteresis loss and eddy current loss in the rotating shaft. At the same time, since the bias magnetic field in the magnetic circuit is provided by the permanent magnet ring and the unipolar magnetic pole structure, the first excitation winding only needs to provide the dynamic ampere-turns required for the radial active control of the magnetic bearing, so that the copper loss of the first excitation winding is reduced. It is better to make the volume of the magnetic bearing smaller. At the same time, the reduction of the ampere-turns of the first excitation winding is also conducive to the reduction of the winding inductance, so that a higher radial force control response speed can be achieved, thereby effectively improving the stability of the rotating shaft during high-speed rotation.

[0022] Preferably, the axial magnetic bearing comprises a stator core assembly and a mover assembly;

[0023] The mover assembly is mounted on the outside of the rotating shaft;

[0024] The stator core assembly is an annular core composed of a first core and a second core, the annular core is sleeved outside the mover assembly, and a second air gap is left between the annular core, the mover assembly and the rotating shaft;

[0025] A second excitation winding is also provided in the annular iron core, and the second excitation winding is connected to the inner side of the annular iron core.

[0026] Further preferably, the mover assembly is provided with a groove, and the groove is obtained by being recessed from the surface facing the first iron core to the side of the second iron core;

[0027] An axially magnetized annular permanent magnet and a magnetic isolation ring are axially arranged in the groove, and the magnetic isolation ring is made of non-magnetic conductive material.

[0028] In the present technical solution, when the annular permanent magnet acts alone, there is no magnetic field generated by the annular permanent magnet between the mover assembly and the second stator core assembly, and thus there is no interaction force; and the permanent magnetic field in the second air gap between the mover assembly and the first stator core assembly will generate an action force between the mover assembly and the first stator core assembly, the direction of which is to try to reduce the second air gap between the mover assembly and the first stator core assembly, so that the mover assembly and the rotating shaft fixedly connected thereto move in the direction of the thrust component. Unlike the magnetic field generated by the annular permanent magnet, the magnetic field generated when the second excitation winding acts alone forms a closed loop through the stator core assembly, the mover assembly, and the air gap between the two sides of the mover assembly and the stator core assembly. Therefore, the mover assembly will be subjected to the action forces generated by the magnetic fields in the air gaps on both sides of it in opposite directions. When the magnetic field formed by the second excitation winding of the axial magnetic suspension bearing and the annular permanent magnet acts together, in the second air gap on the side of the moving component facing the first stator core component, the magnetic flux generated by the second excitation winding and the annular permanent magnet cancel each other, so that the average magnetic field density in the air gap is lower than the magnetic field density when the annular permanent magnet acts alone, so as the excitation current in the second excitation winding increases within the design range, the electromagnetic force in the second air gap between the moving component and the first core component decreases. In the second air gap on the side of the moving component facing the second core, there is only the magnetic field generated by the second excitation winding, so as the excitation current in the second excitation winding increases within the design range, the electromagnetic force in the second air gap between the moving component and the second core increases. The resultant force borne by the moving core is the difference obtained by subtracting the electromagnetic forces in the second air gaps on both sides. In this way, the size and direction of the resultant force borne by the movable component can be adjusted by adjusting the current in the second excitation winding, thereby adjusting the axial position of the movable component and the rotating shaft connected thereto relative to the stator or stator core assembly, thereby realizing the contactless support and positioning function of the axial magnetic bearing and effectively ensuring the stability of the rotating shaft during rotation.

[0029] Preferably, the mover assembly is annular in shape and fixedly connected to the rotating shaft.

[0030] In the technical solution, the mover assembly is fixedly connected to the rotating shaft by cold-fitting or hot-fitting, which can effectively improve the connection strength and ensure the required assembly accuracy.

[0031] Preferably, the first core and the second core are detachably connected.

[0032] In the technical solution, the first iron core and the second iron core are arranged to be detachably connected, the purpose is to effectively improve the manufacturability and maintainability of the device. After the spinning cup is separated from the rotating shaft, the rotating shaft can be moved in or out by removing the aforementioned detachable first iron core assembly. It is convenient to assemble the rotating shaft in the manufacturing process and replace the rotating shaft in the maintenance process within a limited space.

[0033] Preferably, the thrust component comprises a thrust ejector pin disposed at the end of the rotating shaft, and a thrust assembly stationary relative to the stator;

[0034] The thrust assembly comprises a fixing member and a stud which are stationary relative to the stator, and a nut located between the fixing member and the stud; one end of the stud passes through the fixing member to interact with the thrust ejector pin.

[0035] In this technical solution, when the motor is operating normally, there is an air gap between the end of the thrust pin and the stud. After the excitation winding of the axial magnetic bearing is powered off, the shaft moves toward the thrust component under the action of the bias force provided by the annular permanent magnet in the bearing, and the movement stops after the thrust pin and the end of the stud come into contact. The contact between the thrust pin and the stud is point contact, which can reduce the friction between the two. By adjusting the position of the stud relative to the shaft, the position where the shaft stays after the excitation winding is powered off can be set, and the set position can be maintained by tightening the fixing nut. The structure is simple and easy to operate.

[0036] In summary, the high-speed motor for air-spinning provided by the present invention has the following characteristics:

[0037] 1. In the present invention, the radial magnetic bearing and the hybrid magnetic bearing are provided to realize the contactless active control of the six degrees of freedom of the combined rotating body composed of the rotating shaft and the spinning rotor fixedly assembled therewith. The spinning rotor can be effectively rotated at high speed, and the radial or axial disturbance force caused by the spinning process or by electromagnetic, mechanical structure, etc. during the rotation can be quickly and accurately compensated, so that the high-speed rotating spinning rotor can be stably maintained at the position required by the spinning process.

[0038] 2. In the present invention, the stator yoke core of the motor is directly connected to the stator winding wound on the coil frame through an adhesive material, avoiding the use of stator core embedded wire slots, effectively reducing the hysteresis and eddy current losses generated by the high-speed rotating magnetic field in the stator. At the same time, through the improvement of the rotating shaft, the hysteresis and eddy current losses generated by the high-speed rotating magnetic field in the stator are significantly reduced, thereby effectively increasing the rotating speed of the rotating shaft, and finally realizing the high-speed rotation of the spinning rotor.

[0039] 3. In the present invention, the unipolar magnetic pole structure with permanent magnet bias can significantly reduce the hysteresis loss and eddy current loss in the rotating shaft. The bias magnetic field in the magnetic circuit is provided by the permanent magnet ring, so that the first excitation winding only needs to provide the dynamic ampere-turns required for the radial active control of the magnetic suspension bearing, so that the copper loss of the first excitation winding is reduced. At the same time, the reduction of the ampere-turns of the first excitation winding is also conducive to the reduction of the winding inductance. Therefore, a higher radial force control response speed can be achieved, and the rotation speed of the rotating shaft can be effectively increased.

[0040] 4. In the present invention, the magnetic field generated by the second excitation winding acting alone mainly utilizes the stator core assembly, the mover assembly, and the air gap between the two sides of the mover assembly and the stator core assembly to form a closed loop.

[0041] 5. In the present invention, when the annular permanent magnet acts alone, there is no magnetic field generated by the annular permanent magnet between the mover assembly and the second core assembly, and thus there is no interaction force. When the second excitation winding and the annular permanent magnet act simultaneously, the magnetic flux generated by the second excitation winding and the annular permanent magnet cancel each other out in the air gap on the side of the mover assembly facing the first core assembly, so that the average magnetic field density in the air gap is lower than the magnetic flux density when the annular permanent magnet acts alone. Therefore, the magnetic field strength on both sides of the mover assembly can be adjusted by adjusting the current in the second excitation winding to change the magnitude and direction of the resultant force borne by the mover, thereby adjusting the axial position of the mover assembly and the shaft connected thereto relative to the stator or the stator core assembly, thereby realizing the contactless support and positioning function of the axial magnetic suspension bearing, and effectively ensuring the stability of the shaft during rotation.

[0042] 6. In the present invention, the moving subassembly is configured to be composed of a detachable first iron core and a second iron core connected together, so that after the spinning cup is separated from the rotating shaft, the rotating shaft can be moved in or out by removing the aforementioned detachable first iron core assembly, thereby improving the manufacturability and maintainability of the device within a limited space.

[0043] 7. In the present invention, when the motor is operating normally, there is an air gap between the end of the thrust pin and the stud. After the second excitation winding of the axial magnetic bearing is powered off, the shaft moves toward the thrust component under the action of the bias force provided by the annular permanent magnet in the bearing. The movement stops after the thrust pin and the end of the stud come into contact. By utilizing the contact between the thrust pin and the stud as point contact, the friction between the two can be effectively reduced, thereby improving the stability of the shaft.

[0044] 8. The present invention has a simple structure and is easy to install. On the basis of improving the stable rotation of the rotating shaft, the rotating speed is effectively increased, thereby achieving an increase in the rotating speed of the spinning rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The preferred implementation scheme will be described below in a clear and understandable manner in conjunction with the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of an air-spinning high-speed motor.

[0046] Figure 1 This is a schematic diagram of the structure of an air-spinning high-speed motor of the present invention;

[0047] Figure 2 A diagram of a radial magnetic bearing in an air-spinning high-speed motor of the present invention;

[0048] Figure 3 for Figure 2 A radial cross-section of a medium radial magnetic bearing;

[0049] Figure 4 for Figure 2 Axial cross-section of a medium radial magnetic bearing;

[0050] Figure 5 This is a diagram of the magnetic field structure formed when the second excitation winding in the axial magnetic suspension bearing acts alone;

[0051] Figure 6 This is a structural diagram of the magnetic field generated by the mover assembly when the annular permanent magnet in the axial magnetic suspension bearing acts alone;

[0052] Figure 7 The magnetic field structure diagram is formed when the annular permanent magnet and the second excitation winding in the axial magnetic suspension bearing work together;

[0053] Figure 8 A magnetic field structure diagram of a hybrid magnetic bearing consisting of a radial magnetic bearing and an axial magnetic bearing;

[0054] Fig. 9 The present invention is a schematic structural diagram of a thrust stop component in an air-spinning high-speed motor.

[0055] Figure Number:

[0056] Rotating shaft 1; cavity structure 11; column 12; columnar permanent magnet 13; thrust ejector pin 14; first side shaft 15; second side shaft 16;

[0057] stator 2; stator winding 21;

[0058] Spinning cup 3;

[0059] Thrust member 4; fixing member 41; stud 42; nut 43;

[0060] Radial magnetic bearing 5; magnetic pole ring 51; first excitation winding 52; permanent magnet ring 53; magnetic circuit closure 54; first air gap 55;

[0061] Axial magnetic bearing 6; stator core assembly 61; first core 611; second core 612; second air gap 613; third air gap 614; mover assembly 62; groove 621; annular permanent magnet 622; magnetic isolation ring 623; second excitation winding 63. DETAILED DESCRIPTION

[0062] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other implementation methods can also be obtained based on these drawings without paying creative work.

[0063] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one"; secondly, the dotted lines and arrows in the drawings indicate the specific direction of the magnetic circuit.

[0064] In an embodiment of the present invention, see Figure 1 As shown, a high-speed air-spinning motor specifically includes a rotating shaft 1 and a stator 2, and a spinning cup 3 is fixed at one end of the rotating shaft 1, and a thrust member 4 is provided at the other end for axial positioning of the rotating shaft 1 when it stops suddenly; it also includes a radial magnetic suspension bearing 5 arranged outside the rotating shaft 1, and a hybrid magnetic suspension bearing composed of the radial magnetic suspension bearing 5 and the axial magnetic suspension bearing 6, so that the rotating shaft 1 is supported between the electromagnets without contact under the action of the radial magnetic suspension bearing 5 and the hybrid magnetic suspension bearing. This structure can realize contactless active control of the six degrees of freedom of the rotating shaft 1, reduce the loss of the rotating shaft 1, and effectively increase the rotation speed of the spinning cup 3.

[0065] Among them, it should be noted that the six degrees of freedom of the rotating shaft 1 are mainly provided by the permanent magnet synchronous motor for axial high-speed rotation control around the motor rotating shaft 1; the radial magnetic bearing 5 provides horizontal and vertical two degrees of freedom position control for the rotating shaft 1 in the plane perpendicular to the axis of the rotating shaft 1; the radial magnetic bearing 5 part of the hybrid magnetic bearing provides horizontal and vertical two degrees of freedom position control for the rotating shaft 1 in the plane perpendicular to the axis of the rotating shaft 1, and the axial magnetic bearing 6 part of the hybrid magnetic bearing provides axial position control. At the same time, in order to increase the stability of the rotation of the rotating shaft 1, the combined center of gravity of the rotating shaft 1 and the spinning cup 3 can be adjusted to the center position between the two radial magnetic bearings 5, see Figure 1 As shown, the radial magnetic bearing 5 is arranged on the outside of the rotating shaft 1 near one end of the stator spinning rotor 3, and the hybrid magnetic bearing is arranged on the outside of the rotating shaft 1 near the thrust member 4. In this way, the rotating shaft 1 can rotate smoothly and quickly through the control of six degrees of freedom, thereby effectively improving the rotation speed and stability of the spinning rotor 3. Of course, in other embodiments, the positions of the radial magnetic bearing 5 and the hybrid magnetic bearing can be reasonably adjusted according to actual needs, and are not limited to the settings in this application.

[0066] In this embodiment 1, refer again to Figure 1 As shown, the present application makes further improvements to the shaft 1, and the improvements are: a cavity structure 11 is provided in the shaft 1 at a position corresponding to the stator 2, and the cavity structure 11 is preferably set as a columnar body, and a column 12 is provided in the columnar cavity structure 11 along the central axis direction of the shaft 1, and the column 12 is located at the axial position of the columnar cavity structure 11 (i.e., the central axis of the shaft 1). In actual use, the column 12 is filled with a radially magnetized columnar permanent magnet 13, and the columnar cavity structure 11 is set to be made of one of non-magnetic conductive materials or weakly magnetic conductive materials, and the first side axis 15 of the shaft 1 (i.e., the part of the shaft 1 corresponding to the radial magnetic suspension bearing 6 on the side of the spinning cup 3) and the second side axis 16 (i.e., the part of the shaft 1 corresponding to the hybrid bearing) are set to be made of magnetic conductive materials. The stator 2 is further connected to the stator winding 21 wound on the coil frame through an adhesive material. In this way, the rotation speed of the rotor 3 and the rotating shaft 1 during the spinning process is effectively increased by reducing the hysteresis and eddy current losses generated by the high-speed rotating magnetic field in the stator 2. At the same time, by improving the structure of the rotating shaft 1, the equivalent magnetic circuit air gap between the columnar permanent magnet 13 and the stator 2 can be set to the wall thickness of the cavity structure 11 and the radial air gap length between the outer surface of the cavity structure 11 and the stator winding 21, as well as the sum of the radial thickness of the stator winding 21. This design increases the equivalent magnetic circuit air gap, so the magnetic field density jointly generated by the columnar permanent magnet 13 and the current in the stator winding 21 will become smaller, so that the hysteresis and eddy current losses generated by the high-speed rotating magnetic field in the stator 2 are significantly reduced, thereby effectively increasing the rotation speed of the rotating shaft 1.

[0067] In this second embodiment, see Figure 2-4 As shown, further improvements are made on the basis of the above embodiment, wherein the improvement is that the radial magnetic suspension bearing 5 is mainly composed of a magnetic pole ring 51, a permanent magnet ring 53, and a magnetic circuit closure ring 54, and the three components form a monopole magnetic pole structure. In the present application, the permanent magnet ring 53 is preferably arranged in the middle of the magnetic pole ring 51 and the magnetic circuit closure ring 54, that is, one end of the permanent magnet ring 53 is connected to the magnetic pole ring 51, and the other end is connected to the magnetic circuit closure ring 54. In this way, when the entire monopole magnetic pole structure is sleeved on the outside of the rotating shaft 1, the permanent magnet ring 53 is located on the outside of the entire monopole magnetic pole structure. At the same time, at least four magnetic poles facing the rotating shaft 1 are symmetrically distributed on the magnetic pole ring 51, and each magnetic pole is surrounded by a first excitation winding 52.

[0068] It should be noted that the magnetic circuit closure 54 ring is poleless and only provides a magnetic circuit closure 54 path. The single-pole biased magnetic circuit formed by the magnetic pole ring 51, the permanent magnet ring 53, and the magnetic circuit closure 54 makes the magnetic field direction in the magnetic circuit always in a single direction, and there is no reverse magnetization. Therefore, the hysteresis loss and eddy current loss in the rotating shaft 1 can be significantly reduced by adopting a single-pole magnetic pole structure with permanent magnet bias. The magnetic circuit of the single-pole magnetic pole structure is specifically permanent magnet ring 53-magnetic pole ring 51-first air gap 55-rotating shaft 1-first air gap 55-magnetic circuit closure 54 ring-permanent magnet ring 53, see Figure 4 As shown. In this way, the first excitation winding 52 only needs to provide the dynamic ampere-turns required for the radial active control of the magnetic suspension bearing, reducing the copper loss of the first excitation winding 52. The radial magnetic suspension bearing 5 of the more preferred structure has a smaller volume, and while the ampere-turns of the first excitation winding 52 are reduced, it is also beneficial to reduce the winding inductance, and can achieve a higher radial force control response speed, thereby effectively increasing the rotation speed of the shaft 1.

[0069] In this third embodiment, see Figure 1 ,as well as Figure 5-7 As shown, improvements are made on the basis of the above-mentioned embodiment, wherein the improvement lies in that the axial magnetic bearing 6 is configured to consist of a stator core assembly 61 and a mover assembly 62. At the same time, in the present application, the stator core assembly 61 is preferably configured to consist of a first core 611 and a second core 612, and the two are connected to form an annular core, and a second excitation winding 63 is also arranged inside the annular core, and the second excitation winding 63 is connected to the inner side of the annular core. During actual installation, the mover assembly 62 is assembled on the outside of the rotating shaft 1, and the annular core is sleeved on the outside of the mover assembly 62, so that the annular core, that is, the outer side of the second excitation winding 63 is connected to the inner side of the annular core, and a second air gap 613 is left between the inner side of the second excitation winding 63 and the mover assembly 62 and the rotating shaft 1. In this way, when the second excitation winding 63 acts alone, the magnetic field and direction formed are as shown in FIG. Figure 5As shown by the dotted lines and arrows in FIG. 1 . The magnetic field generated by the second excitation winding 63 when acting alone passes through the stator core assembly 61, the mover assembly 62, and the air gap between the two sides of the mover assembly 62 and the stator core assembly 61 to form a closed loop. Therefore, the mover assembly 62 will be subjected to the force generated by the magnetic field in the air gaps on both sides of it in the opposite directions. For details, see the attached Figure 5 shown.

[0070] At the same time, further improvements are made on the basis of the above-mentioned embodiment 3, and the improvements are: preferably, a groove 621 is set on the mover assembly 62, and the groove 621 is obtained by being recessed from the surface facing the first iron core 611 to the side of the second iron core 612. In this way, in actual use, an axially magnetized annular permanent magnet 622 and a magnetic isolation ring 623 are axially arranged in the groove 621. Among them, it should be noted that the magnetic isolation ring 623 is made of non-magnetic conductive material. During installation, the annular permanent magnet 622 is set in the middle position of the groove 621, and magnetic isolation rings 623 are provided on both sides of the annular permanent magnet 622, that is, on the two inner walls of the groove 621. See Figure 6 As shown, when the annular permanent magnet acts alone, there is no magnetic field generated by the annular permanent magnet in the second air gap 613 between the movable component 62 and the second core component 612, and thus there is no interaction force; and the permanent magnetic field in the third air gap 614 between the movable component 62 and the first core 611 will generate a force between the movable component 62 and the first core 611, and the direction of the force is to try to reduce the air gap between the movable component 62 and the first core 611, so that the movable component 62 and the rotating shaft 1 fixedly connected thereto move toward the direction of the thrust component 4.

[0071] When the axial magnetic bearing 6 is actually used, Figure 7As shown, the magnetic field formed when the second excitation winding 63 and the annular permanent magnet 622 act together. In the third air gap 614 on the side of the mover assembly 62 facing the first iron core 611, the magnetic flux generated by the second excitation winding 63 and the annular permanent magnet 622 cancel each other, so that the average magnetic field density in the air gap is lower than the magnetic field density when the annular permanent magnet 622 acts alone, so as the excitation current in the second excitation winding 63 increases within the design range, the electromagnetic force in the third air gap 614 between the mover assembly 62 and the first iron core 611 assembly decreases. In the second air gap 613 on the side of the mover assembly 62 facing the second iron core 612, there is only the magnetic field generated by the second excitation winding 63, so as the excitation current in the second excitation winding 63 increases within the design range, the electromagnetic force in the second air gap 613 between the mover assembly 62 and the second iron core 612 increases. The resultant force borne by the mover core is the difference obtained by subtracting the electromagnetic forces in the second air gap 613 and the third air gap 614 on both sides thereof. In this way, the magnitude and direction of the resultant force borne by the mover assembly 62 can be adjusted by adjusting the current in the second excitation winding 63, thereby adjusting the axial position of the mover assembly 62 and the shaft 1 connected thereto relative to the stator 2 or the stator core assembly 61, thereby realizing the contactless support and positioning function of the axial magnetic suspension bearing 6, and effectively ensuring the stability of the shaft 1 during rotation.

[0072] Among them, it should be noted that the shape of the movable subassembly 62 is set to be annular, and there are various ways to connect it to the rotating shaft 1. In this application, it is preferably a cold-sleeve or hot-sleeve fixed connection. The specific design can be carried out according to actual design requirements. This application will not go into details one by one. It is only necessary to meet the connection strength and ensure the axial relative position and coaxiality of the movable subassembly 62 and the rotating shaft 1.

[0073] In the fourth embodiment, refer again to Figure 5-7 As shown, an improvement is made on the basis of the above-mentioned embodiment 3, and the improvement is that the first iron core 611 and the second iron core 612 are detachably connected. This can improve the manufacturability and maintainability of the entire device. In actual operation, the rotating shaft 1 can be moved in or out by simply separating the spinning cup 3 from the rotating shaft 1 and removing the first iron core 611 of the detachable stator iron core assembly. It is convenient to assemble the rotating shaft 1 in the manufacturing process and replace the rotating shaft 1 in the maintenance process within a limited space.

[0074] In the fifth embodiment, an improvement is made on the basis of the above embodiment, and the improvement is that the radial magnetic suspension bearing 5 and the axial magnetic suspension bearing 6 are spliced ​​together to form a hybrid magnetic suspension bearing. Figure 8As shown, the magnetic circuit closure 54 in the radial magnetic bearing 5 is specifically connected to the second core 612 in the axial magnetic bearing 6. In the present application, the two are preferably arranged to be integrally formed, so that the radial magnetic bearing 5 and the axial magnetic bearing 6 act on the rotating shaft 1 at the same time, and the working magnetic flux of the axial magnetic bearing 6 and the working magnetic flux of the radial magnetic bearing 5 are designed to be opposite to each other in the second core 612, so as to reduce the synthetic magnetic flux density in the second core 612, thereby further reducing the magnetic circuit loss or using less ferromagnetic material and reducing the occupied space, thereby effectively reducing the volume of the entire structure.

[0075] In actual use of the above embodiment, by adjusting the current in the second excitation winding 63, the magnitude and direction of the resultant force borne by the mover assembly 62 can be adjusted, so that the axial position of the mover assembly 62 and the rotating shaft 1 fixedly connected thereto relative to the motor stator 2 or the stator core of the magnetic suspension bearing can be adjusted to realize the contactless support and positioning function of the axial magnetic suspension bearing 6; when the second excitation winding 63 of the axial magnetic suspension bearing 6 is powered off, the mover assembly 62 and the rotating shaft 1 fixedly connected thereto move axially in the direction of the thrust member 4. Therefore, at this time, the thrust member 4 is required to limit the rotating shaft 1 to prevent it from continuing to move, so the thrust member 4 plays a key role.

[0076] There are many structures of the thrust member 4. In this application, see Fig. 9 As shown, preferably, the thrust component 4 is configured to include a thrust pin 14 disposed at the end of the rotating shaft 1 and a thrust assembly stationary relative to the stator 2; and the thrust assembly includes a fixing member 41 and a stud 42 stationary relative to the stator 2, and a nut 43 located between the fixing member 41 and the stud 42; one end of the stud 42 penetrates the fixing member 41 and interacts with the thrust pin 14. In this way, when the motor is operating normally, there is an air gap between the ends of the thrust pin 14 and the stud 42. After the excitation winding of the axial magnetic suspension bearing 6 is powered off, the rotating shaft 1 moves toward the thrust component 4 under the action of the biasing force provided by the annular permanent magnet in the bearing, and the movement stops after the thrust pin 14 and the ends of the stud 42 contact. The contact between the thrust pin 14 and the stud 42 is a point contact, which can reduce the friction between the two. By adjusting the position of the stud 42 relative to the rotating shaft 1, the position where the rotating shaft 1 stays after the excitation winding is powered off can be set, and the set position can be maintained by tightening the fixing nut 43. Simple structure and easy operation.

[0077] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A high-speed air-spinning motor, characterized in that: include: A rotating shaft and a stator, wherein a spinning cup is fixed to one end of the rotating shaft, and a thrust member for axially positioning the rotating shaft is provided at the other end; A radial magnetic suspension bearing and a hybrid magnetic suspension bearing composed of the radial magnetic suspension bearing and the axial magnetic suspension bearing are provided on the outer side of the rotating shaft; The axial magnetic bearing comprises a stator core assembly and a mover assembly; The mover assembly is mounted on the outside of the rotating shaft; The stator core assembly is an annular core composed of a first core and a second core, the annular core is sleeved outside the mover assembly, and a second air gap is left between the annular core, the mover assembly and the rotating shaft; A second excitation winding is also provided in the annular iron core, and the second excitation winding is connected to the inner side of the annular iron core; The movable subassembly is provided with a groove, and the groove is formed by being recessed from the surface facing the first iron core to the side of the second iron core; An axially magnetized annular permanent magnet and a magnetic isolation ring are axially arranged in the groove, and the magnetic isolation ring is made of non-magnetic conductive material; The radial magnetic bearing and the hybrid magnetic bearing support the rotating shaft between the electromagnets in a contactless manner.

2. The high-speed air-spinning motor according to claim 1, characterized in that: A cavity structure is provided in the rotating shaft at a position corresponding to the stator, the cavity structure is cylindrical, and a column is provided in the cylindrical cavity structure along the central axis direction of the rotating shaft; The column is a radially magnetized cylindrical permanent magnet; The cavity structure portion of the rotating shaft corresponding to the stator is made of a non-magnetic conductive material or a weakly magnetic conductive material; The portion of the rotating shaft corresponding to the magnetic suspension bearing is made of magnetic conductive material.

3. The high-speed air-spinning motor according to claim 2, characterized in that: The stator is connected to the stator winding wound on the coil frame through an adhesive material; The equivalent magnetic circuit air gap between the columnar permanent magnet and the stator is the sum of the wall thickness of the cavity structure, the radial air gap length between the outer surface of the cavity structure and the stator winding, and the radial thickness of the stator winding.

4. The high-speed air-spinning motor according to claim 1, characterized in that: The radial magnetic bearing is composed of a magnetic pole ring, a permanent magnet ring, and a magnetic circuit closed ring, and forms a monopole magnetic pole structure; At least four magnetic poles facing the rotating shaft are symmetrically distributed on the magnetic pole ring, and a first excitation winding is wound around each of the magnetic poles.

5. The high-speed air-spinning motor according to claim 4, characterized in that: The permanent magnet ring is located between the magnetic pole ring and the magnetic circuit closed ring; The monopole magnetic pole structure is sleeved on the outside of the rotating shaft, and a first air gap is left between the monopole magnetic pole structure and the rotating shaft.

6. The high-speed air-spinning motor according to claim 1, characterized in that: The movable element assembly is annular in shape and is fixedly connected to the rotating shaft.

7. The high-speed air-spinning motor according to claim 1, characterized in that: The first iron core and the second iron core are detachably connected.

8. An air-spinning high-speed motor according to any one of claims 1 to 7, characterized in that: The thrust component includes a thrust ejector pin disposed at the end of the rotating shaft, and a thrust assembly stationary relative to the stator; The thrust assembly comprises a fixing member and a stud which are stationary relative to the stator, and a nut located between the fixing member and the stud; one end of the stud passes through the fixing member to interact with the thrust ejector pin.

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