An ultra-quiet brushless motor based on magnetic levitation bearings and a meat grinder

Abstract

This invention belongs to the field of magnetic levitation motor technology, specifically an ultra-quiet brushless motor and meat grinder based on magnetic levitation bearings. Addressing the problem in existing technologies where protective bearings are easily damaged by high-speed impacts when the motor shaft becomes unstable, the following solution is proposed: a main housing with an overall cylindrical barrel structure. An annular neck is pre-installed at the bottom of the main housing, i.e., the output shaft end. A protective bushing is engaged with the inner circumference of the annular neck. Radial magnetic levitation bearings are respectively arranged on the inner circumference of the main housing near both ends. In use, when the motor shaft suddenly becomes unstable during high-speed rotation, the auxiliary abutment at the tail end will first rapidly impact the auxiliary support roller. The roller bracket itself, in conjunction with the energy storage spring, can prevent continuous high-intensity rigid resistance, thus preventing the auxiliary abutment from breaking or undergoing axial deformation during violent impact.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation motor technology, and in particular to an ultra-quiet brushless motor and meat grinder based on magnetic levitation bearings. Background Technology

[0002] A magnetic levitation motor is a type of motor that uses the interaction of magnetic fields to levitate and drive an object. Its principle is to levitate and drive the rotor using a strong magnetic field, avoiding mechanical friction, thus giving magnetic levitation motors higher efficiency, quieter operation, and a longer lifespan.

[0003] The core of a magnetic levitation motor lies in controlling electromagnetic forces. If the stability of the magnetic field is compromised, it can lead to rotor instability, affecting the motor's normal operation. After instability, the rotor, due to the gyroscopic effect, will nutate and precess chaotically within the motor, and the high-frequency, disordered impacts can damage the motor's mechanical structure. Typically, the magnetic bearing is also out of control during instability; therefore, a rapid power cut-off is usually employed, allowing the protective bearing to withstand the high-frequency impacts from the rotor. However, existing protective bearings are fixedly mounted at both ends of the motor housing and lack cushioning capabilities. Such high-speed, hard collisions can easily damage both bearings. To address this issue, we propose a novel ultra-quiet brushless motor based on magnetic levitation bearings. Summary of the Invention

[0004] To address the aforementioned shortcomings in the prior art, this invention provides an ultra-quiet brushless motor based on a magnetic levitation bearing that can flexibly clamp and slowly correct a motor shaft in an unstable state.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0006] A super-quiet brushless motor based on magnetic levitation bearings is provided, comprising a main housing with an overall cylindrical barrel structure. An annular narrow neck is pre-formed at the bottom of the main housing, i.e., the output shaft end. A protective bushing is engaged on the inner circumference of the annular narrow neck. Radial magnetic levitation bearings are respectively arranged near both ends of the inner circumference of the main housing. The two radial magnetic levitation bearings are rotatably connected to the same motor shaft. The output shaft end of the motor shaft passes through the protective bushing. Sensor assemblies are respectively arranged near both ends inside the main housing. An axial magnetic push plate adapted to the motor shaft is provided at one end of the inner circumference of the main housing near the barrel opening. An auxiliary abutment is detachably fixed at one end of the motor shaft near the axial magnetic push plate. The axis of the auxiliary abutment coincides with the axis of the motor shaft. The barrel of the main housing... A heat dissipation module is fixed at the opening, and the heat dissipation module includes an outer barrel cover fixedly fitted at the opening of the main unit casing. Three centrally symmetrical sliding support frames are slidably connected to the inner circumference of the outer barrel cover. A fixed ring with a circular structure is fixed between the three sliding support frames. The inner circumference of the fixed ring has multiple centrally symmetrical sliding holes, all extending in a centripetal direction. The center line of the fixed ring coincides with the axis of the auxiliary abutment. A roller bracket is slidably connected in each sliding hole. An energy storage spring is fixed on the side of each roller bracket near the bottom of the sliding hole. An auxiliary support roller is provided at the end of each roller bracket near the auxiliary abutment. The axis of the auxiliary support roller coincides with the axis of the auxiliary abutment. The auxiliary support roller does not contact the outer wall of the auxiliary abutment during normal startup.

[0007] A further feature of this invention is that an annular groove is formed on the outer circumferential wall of the auxiliary abutment near the auxiliary support roller, and the cross-section of the annular groove is trapezoidal. The outer circumferential wall of the auxiliary support roller is fitted into the annular groove and does not contact its bottom. Each sliding support frame is fixed with a support shaft column passing through the bottom of the outer barrel cover on the side near the bottom of the outer barrel cover. The axis of each support shaft column is perpendicular to the bottom of the barrel. A sliding bearing is embedded in the bottom of the outer barrel cover near each support shaft column. The inner diameter of the sliding bearing is matched with the diameter of the corresponding support shaft column. A compression spring is fixed between the sliding support frame and the bottom of the barrel. Through the compression spring and the annular groove that fits against the outer wall of the auxiliary support roller, when the motor shaft rotates axially, it will be blocked by the auxiliary support roller. At the same time, it will drive the fixed ring to move axially as a whole. At this time, the damage caused by the burst can be reduced under the action of the compression spring.

[0008] A further feature of the present invention is that the width of the annular groove is equal to 1.3-1.5 times the length of the auxiliary support roller body. This arrangement allows the auxiliary abutment to have a certain axial movement space.

[0009] A further feature of this invention is that a rectangular hole is provided on the outer circumferential wall of the main casing near the opening of the barrel, and a controller module is fixed on the outer wall of the main casing near the rectangular hole. The controller module includes a rectangular outer cover, and a controller is disposed inside the rectangular outer cover. The controller is electrically connected to an axial magnetic push plate, a radial magnetic levitation bearing, and a sensor assembly. Heat dissipation holes are provided on both the front and rear sides of the rectangular outer cover. By providing rectangular holes that communicate with the interior, the heat dissipation inside can be accelerated.

[0010] A further feature of this invention is that multiple equidistantly distributed heat dissipation fins are fixed to the outer circumferential wall of the main housing, and a fixing flange is reserved on the outer circumferential wall of the main housing near the heat dissipation module. A mating ring adapted to the fixing flange is provided at the opening of the outer barrel cover. Multiple sets of bolts are provided between the fixing flange and the mating ring. The bolts are locked with top nuts, and the opening of the outer barrel cover is fitted onto the outer circumferential wall of the main housing. By setting the outer barrel cover fitted and fixed to the outer wall of the main housing, and cooperating with the locking of the top nuts, the vibration resistance of the entire heat dissipation module is improved, and the overall eccentricity is prevented due to the instability of the motor shaft causing one side to be subjected to force.

[0011] A further feature of this invention is that an output end fixing plate is reserved at the end of the main housing away from the heat dissipation module, which facilitates direct fixing of the device to the surface of the equipment to be driven. Multiple anti-torsion grooves are centrally symmetrically distributed on the inner circumference of the annular neck near the output end fixing plate. A protrusion adapted to the corresponding anti-torsion groove is reserved on the outer circumference of the protective bushing. Multiple countersunk holes penetrating the side wall of the main housing are opened on the outer circumference of the annular neck, and each countersunk hole corresponds to the position of the anti-torsion groove. A corresponding screw hole is opened on the side of the protrusion near the countersunk hole. A threaded pin is screwed into each screw hole and countersunk hole to fix the protective bushing in the annular neck. Multiple roller grooves are reserved on the inner circumference of the protective bushing, and rollers are installed in each roller groove. A gap is left between the outer wall of the roller and the outer wall of the motor shaft. The protective bushing is made of rubber, facilitating disassembly and maintenance.

[0012] A further feature of this invention is that three spoke support rods are fixed to the end of the fixed ring away from the axial magnetic pusher, and the three spoke support rods extend concentrically towards the center. A common annular fixed outer ring is fixed in the middle of the three spoke support rods, and a T-shaped turntable is rotatably connected to the inner circumference of the fixed outer ring. An annular groove I is formed on the inner circumference of the fixed outer ring, and an annular groove II, which matches the annular groove I, is formed on the outer circumference of the T-shaped turntable. Multiple ball bearings are arranged between the annular groove I and the annular groove II. The T-shaped turntable is located away from the auxiliary abutment. Multiple fan blades are fixed to the outer circumference of one end of the shaft in a centrally symmetrical arrangement. A buffer spring is fixed to the end of the T-shaped turntable near the auxiliary abutment shaft. A rubber contact is fixed to the end of the buffer spring near the auxiliary abutment shaft. Under normal circumstances, the surface of the rubber contact does not contact the end of the auxiliary abutment shaft. The bottom of the outer barrel cover has heat dissipation holes that are evenly distributed. By setting the T-shaped turntable and fan blades rotatably connected to the end of the auxiliary abutment shaft, when it is necessary to dissipate heat from the coil inside the device, it is only necessary to axially press the three protruding support shaft columns so that the rubber contact contacts the auxiliary abutment shaft.

[0013] A further feature of this invention is that a gap is left between the outer circumferential wall of the axial magnetic pusher and the inner circumferential wall of the main housing, and a support rod is provided between the axial magnetic pusher and the inner wall of the main housing. A temperature sensor is also fixed to the inner wall of the rectangular outer cover, and the same pressure ring is fixed to the end of the three support shafts away from the sliding support frame. The pressure ring is formed by welding the two ends of a C-shaped rod and a V-shaped rod with the same opening direction, and the center of gravity of the pressure ring falls at the corner of the V-shaped rod. A pull rope is fixed to the corner of the V-shaped rod, and the bottom of the outer barrel cover is on the side away from the main housing. A mounting groove is provided in the middle, and the pressure ring is symmetrical about the center line of the mounting groove. A fixed pulley is provided at the bottom of the mounting groove, directly opposite the V-shaped corner of the pressure ring. An electrically controlled positioning pin is fixed on the mounting groove. The extension direction of the extension rod of the electrically controlled positioning pin is consistent with the extension direction of the mounting groove. A protruding plate is fixed at the end of the extension shaft of the electrically controlled positioning pin, extending into the bottom of the mounting groove. A pull rope passes around the fixed pulley and is fixed to the protruding plate. The protruding plate can slide freely in the mounting groove. The control switch of the electrically controlled positioning pin is connected to the controller through a signal line.

[0014] A further feature of this invention is that two symmetrical heat dissipation holes are provided on the inner circumferential wall of the main housing near the annular narrow neck, and an airflow channel is reserved between the outer wall of the radial magnetic levitation bearing and the inner wall of the main housing. Through the provided airflow channel and heat dissipation holes, in conjunction with the air blown in by the heat dissipation module, heat can be quickly guided out and the heat dissipation of the internal heat-generating components can be accelerated.

[0015] A meat grinder includes the aforementioned ultra-quiet brushless motor based on a magnetic levitation bearing.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. By setting auxiliary support rollers and idler roller brackets at the tail end of the motor shaft and symmetrically surrounding the auxiliary abutment shaft, when the motor shaft suddenly becomes unstable at high speed, the auxiliary abutment shaft at the tail end will first quickly impact the auxiliary support rollers. The idler roller bracket itself, together with the energy storage spring, can avoid generating continuous high-intensity rigid resistance, thereby preventing the auxiliary abutment shaft from being broken or axially deformed during violent impact.

[0018] 2. Through the compression spring and the annular groove that fits against the outer wall of the auxiliary support roller, when the motor shaft moves axially, it will be blocked by the auxiliary support roller, and at the same time, it will drive the fixed ring to move axially as a whole. At this time, the damage caused by the burst can be reduced under the action of the compression spring.

[0019] 3. By setting the electronically controlled positioning pin in conjunction with the temperature sensor, when the temperature is detected to be too high, the electronically controlled positioning pin can be controlled to move in jog, which in turn drives the entire fixed ring to move axially towards the magnetic push plate, thereby causing the fan blades to rotate intermittently. This maintains the airflow without rotating too fast and affecting the operation of the motor shaft. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an ultra-quiet brushless motor based on a magnetic levitation bearing proposed in this invention.

[0021] Figure 2 This is a schematic diagram of the overall structure of the other side of an ultra-quiet brushless motor based on a magnetic levitation bearing proposed in this invention.

[0022] Figure 3 This is a top view of an ultra-quiet brushless motor based on a magnetic levitation bearing proposed in this invention.

[0023] Figure 4 This invention proposes an ultra-quiet brushless motor based on magnetic levitation bearings. Figure 3 Schematic diagram of the cross-sectional structure along line AA;

[0024] Figure 5 This invention proposes an ultra-quiet brushless motor based on magnetic levitation bearings. Figure 4 Enlarged structural diagram at point B;

[0025] Figure 6 This is an exploded view of an ultra-quiet brushless motor based on a magnetic levitation bearing proposed in this invention.

[0026] Figure 7 This is a schematic diagram of a half-section three-dimensional structure of the main housing in an ultra-quiet brushless motor based on magnetic levitation bearings proposed in this invention.

[0027] Figure 8 This is a schematic diagram of the rotor and stator coils of an ultra-quiet brushless motor based on magnetic levitation bearings proposed in this invention.

[0028] Figure 9 This is an exploded view of the heat dissipation module in an ultra-quiet brushless motor based on a magnetic levitation bearing proposed in this invention.

[0029] Figure 10 This is an assembly diagram of the T-shaped turntable and the fixed outer ring in an ultra-quiet brushless motor based on a magnetic levitation bearing proposed in this invention.

[0030] Figure 11 This is a three-dimensional structural diagram of a flexible roller bracket in an ultra-quiet brushless motor based on a magnetic levitation bearing, as proposed in this invention.

[0031] In the diagram: 1. Main unit housing; 101. Annular narrow neck; 102. Rectangular hole; 103. Anti-torsion groove; 104. Fixing flange; 2. Pressure ring; 3. Heat dissipation module; 301. Mounting groove; 302. Heat dissipation hole one; 4. Heat dissipation hole two; 5. Controller module; 501. Controller; 502. Temperature sensor; 6. Heat dissipation fins; 7. Output end fixing plate; 8. Motor shaft; 9. Protective bushing; 901. Protrusion; 10. Electrical control positioning pin; 11. Sliding bearing; 12. Top nut; 3. Countersunk hole; 14. Support shaft column; 15. Auxiliary abutment shaft; 16. Fixing ring; 17. Axial magnetic push plate; 18. Radial magnetic levitation bearing; 19. Roller; 20. Sensor assembly; 21. Sliding support frame; 22. Idler roller bracket; 23. Auxiliary support roller; 24. Rubber contact; 25. Fixed outer ring; 26. Buffer spring; 27. T-shaped turntable; 28. Fan blade; 29. ​​Spoke support rod; 30. Fixed pulley; 31. Annular groove one; 32. Annular groove two; 33. Energy storage spring. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] In this embodiment, refer to Figures 1-11This solution provides an ultra-quiet brushless motor based on magnetic levitation bearings, which includes a main housing 1 with an overall cylindrical barrel structure. An annular narrow neck 101 is pre-formed at the bottom of the main housing 1, i.e., the output shaft end. A protective bushing 9 is engaged with the inner circumference of the annular narrow neck 101. Radial magnetic levitation bearings 18 are respectively arranged near both ends of the inner circumference of the main housing 1. The two radial magnetic levitation bearings 18 are rotatably connected to the same motor shaft 8. The output shaft end of the motor shaft 8 passes through the protective bushing 9. Sensor assemblies 20 are respectively arranged inside the main housing 1 near both ends. An axial magnetic push plate 17, adapted to the motor shaft 8, is provided on the inner circumference of the main casing 1 near the opening. A self-locking threaded hole is provided on the end of the motor shaft 8 near the axial magnetic push plate 17, and an auxiliary abutment 15 is screwed into the self-locking threaded hole. The axis of the auxiliary abutment 15 coincides with the axis of the motor shaft 8. A heat dissipation module 3 is fixed at the opening of the main casing 1. The heat dissipation module 3 includes an outer casing fixedly fitted at the opening of the main casing 1. Three centrally symmetrical sliding support frames 21 are slidably connected to the inner circumference of the outer casing. A fixed ring 16 with a circular structure is fixed between 21. Multiple centrally symmetrical sliding holes are formed on the inner circumference of the fixed ring 16, all extending in a centripetal direction. The centerline of the fixed ring 16 coincides with the axis of the auxiliary abutment 15. Roller brackets 22 are slidably connected to each sliding hole. An energy storage spring 33 is fixed to the side of each roller bracket 22 near the bottom of the sliding hole. An auxiliary support roller 23 is provided at the end of each roller bracket 22 near the auxiliary abutment 15, and the axis of the auxiliary support roller 23 coincides with the axis of the auxiliary abutment 15. When the auxiliary support roller 23 overlaps with the outer wall of the auxiliary abutment shaft 15 during normal startup, the auxiliary support roller 23 and the idler roller bracket 22, which are set at the tail end of the motor shaft 8 and centrally symmetrically surround the auxiliary abutment shaft 15, will first and quickly impact the auxiliary support roller 23 when the motor shaft 8 suddenly becomes unstable during high-speed rotation. The idler roller bracket 22, together with the energy storage spring 33, can avoid generating continuous high-intensity hard resistance, thereby preventing the auxiliary abutment shaft 15 from being broken or axially deformed during violent impact.

[0034] Reference Figures 1-5An annular groove is provided on the outer circumference of the auxiliary support shaft 15 near the auxiliary support roller 23, and the cross-section of the annular groove is trapezoidal. The outer circumference of the auxiliary support roller 23 is stuck in the annular groove and does not contact its bottom. Each sliding support frame 21 is fixed with a support shaft column 14 passing through the bottom of the outer barrel cover on the side near the bottom of the outer barrel cover. The axis of each support shaft column 14 is perpendicular to the bottom of the barrel. A sliding bearing 11 is embedded in the bottom of the outer barrel cover near each support shaft column 14. The inner diameter of the sliding bearing 11 is matched with the diameter of the corresponding support shaft column 14. A compression spring is fixed between the sliding support frame 21 and the bottom of the barrel. Through the compression spring and the annular groove that fits against the outer wall of the auxiliary support roller 23, when the motor shaft 8 moves axially, it will be blocked by the auxiliary support roller 23. At the same time, it will drive the fixed ring 16 to move axially as a whole. At this time, the damage caused by the burst can be reduced under the action of the compression spring.

[0035] In this invention, the width of the annular groove is equal to 1.3-1.5 times the length of the auxiliary support roller 23. By setting it in this way, the auxiliary abutment 15 can have a certain axial movement space.

[0036] Reference Figure 3 , Figure 6 , Figure 7 A rectangular hole 102 is provided on the outer circumference of the main casing 1 near the opening of the barrel, and a controller module 5 is fixed on the outer wall of the main casing 1 near the rectangular hole 102. The controller module 5 includes a rectangular outer cover, and a controller 501 is provided inside the rectangular outer cover. The controller 501 is electrically connected to the axial magnetic push plate 17, the radial magnetic levitation bearing 18 and the sensor assembly 20. Heat dissipation holes 4 are provided on both the front and rear sides of the rectangular outer cover. By providing the rectangular hole 102 that communicates with the interior, the heat dissipation inside can be accelerated.

[0037] Reference Figures 6-7 Multiple heat dissipation fins 6 are fixed on the outer circumference of the main housing 1. A fixing flange 104 is reserved on the outer circumference of the main housing 1 near the heat dissipation module 3. A mating ring adapted to the fixing flange 104 is provided at the opening of the outer barrel cover. Multiple sets of bolts are provided between the fixing flange 104 and the mating ring. The bolts are locked with the top nuts 12. The barrel opening of the outer barrel cover is fitted onto the outer circumference of the main housing 1. By setting the outer barrel cover fitted onto the outer wall of the main housing 1 and locking it with the top nuts 12, the vibration resistance of the entire heat dissipation module 3 is improved, and the overall eccentricity is prevented due to the instability of the motor shaft 8 causing one side to be stressed.

[0038] Reference Figures 6-7The end of the main housing 1 furthest from the heat dissipation module 3 has a pre-reserved output end fixing plate 7, which facilitates direct fixing of the device to the surface of the equipment to be driven. Multiple anti-torsion grooves 103 are centrally symmetrically distributed on the inner circumference of the annular neck 101 near the output end fixing plate 7. The outer circumference of the protective bushing 9 has a pre-reserved protrusion 901 that matches the corresponding anti-torsion groove 103. Multiple countersunk holes 13 penetrating the side wall of the main housing 1 are provided on the outer circumference of the annular neck 101, and each countersunk hole 13 corresponds to a protrusion 901. Corresponding to the anti-torsion groove 103, the protrusion 901 and the side near the countersunk hole 13 are provided with corresponding screw holes. Each screw hole and countersunk hole 13 is screwed with a threaded pin to fix the protective bushing 9 in the annular neck 101. The inner circumference of the protective bushing 9 is reserved with multiple roller grooves, and each roller groove is provided with a roller 19. There is a gap between the outer wall of the roller 19 and the outer wall of the motor shaft 8. The protective bushing 9 is made of rubber. The protective bushing 9 is designed to facilitate disassembly and maintenance.

[0039] Reference Figure 6 , Figure 9 , Figure 10 Three spoke support rods 29 are fixed to one end of the fixed ring 16 away from the axial magnetic push plate 17. The three spoke support rods 29 extend concentrically towards the center. A fixed outer ring 25 with a circular structure is fixed in the middle of the three spoke support rods 29. A T-shaped turntable 27 is rotatably connected to the inner circumference of the fixed outer ring 25. An annular groove 31 is formed on the inner circumference of the fixed outer ring 25, and an annular groove 32 that matches the annular groove 31 is formed on the outer circumference of the T-shaped turntable 27. Multiple balls are arranged between the annular groove 31 and the annular groove 32. The outer circumference of the T-shaped turntable 27 away from the auxiliary abutment shaft 15 is also fixed. The wall is fixed with multiple fan blades 28 arranged in a centrally symmetrical manner, and a buffer spring 26 is fixed to one end of the T-shaped turntable 27 near the auxiliary abutment shaft 15. A rubber contact 24 is fixed to one end of the buffer spring 26 near the auxiliary abutment shaft 15. Under normal circumstances, the surface of the rubber contact 24 does not contact the end of the auxiliary abutment shaft 15. The bottom of the outer barrel cover is provided with heat dissipation holes 302 that are evenly distributed. By setting the T-shaped turntable 27 and fan blades 28 rotatably connected to the end of the auxiliary abutment shaft 15, when it is necessary to dissipate heat from the coil inside the device, it is only necessary to axially press the three protruding support shafts 14 so that the rubber contact 24 contacts the auxiliary abutment shaft 15.

[0040] Reference Figure 2 , Figure 4 and Figure 9A gap is left between the outer circumferential wall of the axial magnetic pusher 17 and the inner circumferential wall of the main housing 1. A support rod is provided between the axial magnetic pusher 17 and the inner wall of the main housing 1. A temperature sensor 502 is also fixed on the inner wall of the rectangular outer cover. The same pressure ring 2 is fixed at the end of the three support shaft columns 14 away from the sliding support frame 21. The pressure ring 2 is welded to both ends of a C-shaped rod and a V-shaped rod with the same opening direction. The center of gravity of the pressure ring 2 falls at the corner of the V-shaped rod. A pull rope is fixed at the corner of the V-shaped rod. An installation groove 301 is opened in the middle of the bottom of the outer cover on the side away from the main housing 1. The pressure ring 2 is symmetrical about the center line of the installation groove 301. A fixed pulley 30 is provided at the bottom of the installation groove 301, which is located directly opposite the corner of the V-shaped rod of the pressure ring 2. A fixed pulley 30 is fixed on the installation groove 301. There is an electrically controlled positioning pin 10. The extension direction of the extension rod of the electrically controlled positioning pin 10 is consistent with the extension direction of the mounting groove 301. The end of the extension shaft of the electrically controlled positioning pin 10 is fixed with a protruding plate that extends into the bottom of the mounting groove 301. The pull rope passes around the fixed pulley 30 and is fixed to the protruding plate. The protruding plate can slide freely in the mounting groove 301. The control switch of the electrically controlled positioning pin 10 is connected to the controller 501 through a signal line. With the setting of the electrically controlled positioning pin 10 and the setting of the temperature sensor 502, when the temperature is detected to be too high, the electrically controlled positioning pin 10 can be controlled to move in jog, which in turn drives the fixed ring 16 to move towards the axial magnetic push plate 17. This drives the fan blade 28 to rotate intermittently, which can maintain the wind power without rotating too fast and affecting the operation of the motor shaft 8.

[0041] Reference Figure 7 Two symmetrical heat dissipation holes are provided on the inner circumference of the main casing 1 near the end of the annular narrow neck 101. An airflow channel is reserved between the outer wall of the radial magnetic levitation bearing 18 and the inner wall of the main casing 1. Through the airflow channel and heat dissipation holes, the heat can be quickly guided out by the air blown in by the heat dissipation module 3, thereby accelerating the heat dissipation of the internal heat-generating components.

[0042] Working principle: When the ambient temperature is too high or the load is too large during normal operation, causing abnormal heating of the internal coil, the temperature sensor 502 will transmit the temperature signal to the controller 501. After analysis, the controller will start the intermittent electric program of the electric positioning pin 10. At this time, the electric positioning pin 10 will move in jogs, and then under the action of the pull rope, it will drive the fixed ring 16 to move towards the axial magnetic push plate 17. When the rubber contact 24 contacts the end of the high-speed rotating auxiliary abutment 15, it can provide power for the T-shaped turntable 27 and the fan blade 28 to rotate quickly. After contact, it will quickly spring away. After the inertia is about to disappear, it will pull the fixed ring 16 to move towards the axial magnetic push plate 17 again. This movement will be performed until the internal temperature drops.

[0043] When the motor shaft 8 suddenly becomes unstable while rotating at high speed, the auxiliary abutment 15 at the tail end will first quickly impact the auxiliary support roller 23. The roller bracket 22 itself, together with the energy storage spring 33, can avoid generating continuous high-intensity hard resistance. When the motor shaft 8 moves axially, it will also be blocked by the auxiliary support roller 23, and at the same time drive the fixed ring 16 to move axially as a whole. Under the action of the compression spring, the damage caused by the sudden impact is weakened.

[0044] A meat grinder includes the aforementioned ultra-quiet brushless motor based on a magnetic levitation bearing.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A magnetic suspension bearing based ultra-quiet brushless motor, comprising a main shell (1) in the shape of a cylindrical barrel structure, an annular neck (101) is reserved at the bottom of the barrel, i.e. the output shaft end, a protection sleeve (9) is clamped on the circumferential inner wall of the annular neck (101), and a radial magnetic suspension bearing (18) is arranged on the circumferential inner wall of the main shell (1) near each end; the same motor rotating shaft (8) is rotatably connected between the two radial magnetic suspension bearings (18), and the output shaft end of the motor rotating shaft (8) penetrates through the protection sleeve (9); a sensor assembly (20) is arranged inside the main shell (1) near each end, characterized in that, The circumferential inner wall of the main shell (1) is provided with an axial magnetic push disc (17) matched with the motor rotating shaft (8) near one end of the barrel mouth, and the end of the motor rotating shaft (8) near the axial magnetic push disc (17) is detachably fixed with an auxiliary shaft (15), the barrel mouth of the main shell (1) is fixed with a heat dissipation module (3), and the heat dissipation module (3) comprises an outer barrel cover fixedly sleeved on the barrel mouth of the main shell (1), the circumferential inner wall of the outer barrel cover is slidably connected with three sliding support frames (21) which are centrally symmetrically distributed, a same fixed ring (16) in a circular ring structure is fixed between the three sliding support frames (21), a plurality of sliding insertion holes which are centrally symmetrically distributed are formed in the circumferential inner wall of the fixed ring (16), and a roller support (22) is slidably connected in each sliding insertion hole, and an energy storage spring (33) is fixed to the side of each roller support (22) near the hole bottom of the sliding insertion hole, and an auxiliary supporting roller (23) is arranged at the end of the roller support (22) near the auxiliary shaft (15).

2. The magnetic levitation bearing based ultra-quiet brushless motor according to claim 1, characterized in that The circumferential outer wall of the auxiliary shaft (15) is provided with an annular cutting groove near the auxiliary supporting roller (23), and the cross section of the annular cutting groove is in a trapezoidal structure, the circumferential outer wall of the auxiliary supporting roller (23) is clamped in the annular cutting groove and does not contact the groove bottom; each sliding support frame (21) is fixed with a support shaft column (14) penetrating through the barrel bottom of the outer barrel cover on the side near the bottom of the outer barrel cover, and a sliding bearing (11) is embedded in the barrel bottom of the outer barrel cover near each support shaft column (14), the inner diameter of the sliding bearing (11) is matched with the diameter of the corresponding support shaft column (14), and a compression spring is fixed between the sliding support frame (21) and the barrel bottom.

3. The magnetic bearing based ultra-quiet brushless motor of claim 2, wherein, The groove width of the annular cutting groove is equal to 1.3-1.5 times the roller body length of the auxiliary supporting roller (23).

4. The magnetic bearing based ultra-quiet brushless motor of claim 3, wherein, The circumferential outer wall of the main shell (1) is provided with a rectangular hole (102) near the barrel mouth, and a controller module (5) is fixed to the outer wall of the main shell (1) near the rectangular hole (102), the controller module (5) comprises a rectangular outer cover, a controller (501) is arranged in the rectangular outer cover, the controller (501) is electrically connected with the axial magnetic push disc (17), the radial magnetic suspension bearing (18) and the sensor assembly (20), and heat dissipation holes two (4) are formed in the front and rear sides of the rectangular outer cover.

5. The magnetic bearing based ultra-quiet brushless motor of claim 4, wherein, A plurality of equidistantly distributed heat dissipation rib plates (6) are fixed to the circumferential outer wall of the main shell (1), and a fixing flange (104) is reserved on the circumferential outer wall of one end of the main shell (1) near the heat dissipation module (3), a butt joint ring matched with the fixing flange (104) is arranged at the opening of the outer barrel cover, a plurality of bolts are arranged between the fixing flange (104) and the butt joint ring, the bolts are locked by counter nuts (12), and the barrel mouth of the outer barrel cover is sleeved on the circumferential outer wall of the main shell (1).

6. The magnetic bearing based ultra-quiet brushless motor of claim 5, wherein, The host shell (1) is reserved with an output end fixing disc (7) far from one end of the heat dissipation module (3), a plurality of anti-twist clamping grooves (103) are arranged on the inner wall of the circumference of the annular neck (101) near one side of the output end fixing disc (7), the outer wall of the circumference of the protection shaft sleeve (9) is reserved with a protrusion (901) matched with the corresponding anti-twist clamping groove (103), a plurality of counterbores (13) are arranged on the outer wall of the circumference of the annular neck (101) and penetrate the side wall of the host shell (1), and the position of each counterbore (13) corresponds to the corresponding anti-twist clamping groove (103), the protrusion (901) is arranged with a screw hole corresponding to the counterbore (13) near the side of the counterbore (13), and a threaded pin is screwed in each screw hole and the counterbore (13), a plurality of roller grooves are reserved in the inner wall of the circumference of the protection shaft sleeve (9), and a roller (19) is arranged in each roller groove, and a gap is left between the outer wall of the roller (19) and the outer wall of the motor rotating shaft (8), and the protection shaft sleeve (9) is made of rubber.

7. The magnetic bearing based ultra-quiet brushless motor of claim 6, wherein, The fixed ring (16) is fixed with three spoke support rods (29) far from one end of the axial magnetic force pushing disc (17), and the three spoke support rods (29) extend to the middle in a centripetal manner, the middle of the three spoke support rods (29) is fixed with a same fixed outer ring (25) in a circular ring structure, the inner wall of the circumference of the fixed outer ring (25) is rotatably connected with a T-shaped turntable (27), the inner wall of the circumference of the fixed outer ring (25) is provided with an annular groove one (31), and the outer wall of the circumference of the T-shaped turntable (27) is provided with an annular groove two (32) matched with the annular groove one (31), a plurality of balls are arranged between the annular groove one (31) and the annular groove two (32), the outer wall of the circumference of one end of the T-shaped turntable (27) far from the auxiliary abutting shaft (15) is fixed with a plurality of fan blades (28) arranged in a central symmetry, and the T-shaped turntable (27) is fixed with a buffer spring (26) near one end of the auxiliary abutting shaft (15), the rubber contact (24) is fixed to one end of the buffer spring (26) near the auxiliary abutting shaft (15), and the surface of the rubber contact (24) is not in contact with the end of the auxiliary abutting shaft (15) under normal circumstances; a plurality of heat dissipation holes one (302) are arranged on the bottom of the outer barrel cover.

8. The magnetic bearing based ultra-quiet brushless motor of claim 7, wherein, The gap is left between the circumferential outer wall of the axial magnetic force push disc (17) and the circumferential inner wall of the main shell (1), and the support rod is arranged between the axial magnetic force push disc (17) and the inner wall of the main shell (1), the inner wall of the rectangular outer cover is further fixed with the temperature sensor (502), and the same compression ring (2) is fixed at the end of the three support shaft columns (14) away from the sliding support frame (21), the compression ring (2) is welded by the C-shaped rod and the V-shaped rod with the same opening and the same direction, the center of gravity of the compression ring (2) falls on the corner of the V-shaped rod, the pull rope is fixed at the corner of the V-shaped rod, the installation groove (301) is formed in the middle of the side of the barrel bottom of the outer barrel cover away from the main shell (1), the compression ring (2) is symmetric about the center line of the installation groove (301), the pulley (30) is arranged on the opposite position of the corner of the V-shaped rod of the compression ring (2) at the groove bottom of the installation groove (301), the electric control positioning pin (10) is fixed on the installation groove (301), the extension direction of the extension rod of the electric control positioning pin (10) is consistent with the extension direction of the installation groove (301), the extension shaft end of the electric control positioning pin (10) is fixed with the lug plate extending into the groove bottom of the installation groove (301), the pull rope is fixed on the lug plate through the pulley (30), the lug plate can freely slide in the installation groove (301), and the control switch of the electric control positioning pin (10) is connected with the controller (501) through the signal line.

9. The magnetic bearing based ultra-quiet brushless motor of claim 8, wherein, The two mutually symmetrical heat dissipation holes are arranged at the end of the circumferential inner wall of the main shell (1) close to the annular neck (101), and the airflow channel is reserved between the outer wall of the radial magnetic suspension bearing (18) and the inner wall of the main shell (1).

10. A meat mincer, characterised in that The ultra-quiet brushless motor based on the magnetic suspension bearing. The ultra-quiet brushless motor based on the magnetic suspension bearing.

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