CN112886870A

CN112886870A - Magnetic suspension motor

Info

Publication number: CN112886870A
Application number: CN202110011276.XA
Authority: CN
Inventors: 姚超; 谭海军; 陶峰; 俞晨凯
Original assignee: Jiangsu Jiuzhi Electric Co ltd
Current assignee: Jiangsu Jiuzhi Electric Co ltd
Priority date: 2021-01-06
Filing date: 2021-01-06
Publication date: 2021-06-01

Abstract

The invention relates to a magnetic suspension motor, which comprises a hollow shell and a fixed seat fixed at the bottom of the shell, wherein end covers are arranged at two ends of the shell, magnetic bearings are arranged at two ends inside the shell, coils are wound in the magnetic bearings, a power supply assembly used for supplying power to the magnetic bearings is arranged inside the shell, a rotating shaft is coaxially arranged between the two magnetic bearings, the inner diameter of each magnetic bearing is larger than the outer diameter of the rotating shaft, a socket for the rotating shaft to extend into is arranged on each end cover, rotating shaft stators are arranged at two ends of each rotating shaft, the rotating shaft stators and the rotating shafts are coaxially arranged, a rotating shaft rotor is arranged outside each rotating shaft stator, and the rotating shaft rotor and the rotating shafts are coaxially arranged. The invention has the advantages of improving the stability of the magnetic suspension motor and improving the running safety.

Description

Magnetic suspension motor

Technical Field

The invention relates to the technical field of motors, in particular to a magnetic suspension motor.

Background

The magnetic suspension motor, also called magnetic motor, is a kind of bearingless motor, is a motor with a novel structure, and compared with the traditional motor which drives rotation by utilizing a metal bearing rotation structure, the magnetic suspension motor has the advantages of higher rotation speed and lower abrasion.

The prior Chinese patent with the publication number of CN2755854Y discloses a magnetic suspension type bearing motor, which consists of a motor base, a shell, an end cover, a shaft, a bearing cover, a stator, a rotor, a bolt and a bearing, and is characterized in that: the shaft, the end cover and the bearing cover of the motor are all made of high-strength and wear-resistant non-metallic materials, the two ends of the shaft are respectively provided with a rotating shaft part of a fixed magnetic bearing and a magnetic bearing part which is corresponding to the rotating shaft part of the fixed magnetic bearing and matched with the rotating shaft part of the magnetic bearing through the end cover and the bearing cover, the outer edge of the magnetic bearing part is provided with a clamp of a non-magnetic-conducting material, the two bearing parts are the same magnetic magnet, and a rotor fixed on the shaft and a stator fixed on a machine shell are in an air friction state of a magnetic suspension space gap.

The above prior art solutions have the following drawbacks: the spindle in the above scheme depends on magnetic suspension inside the casing, and leads to when transportation or use magnetic levitation motor, in case receive the collision from the external world, the position of the inside spindle of casing just can take place to shift, can take place the accident that spindle and other parts collided even for the normal operating of motor has received the influence, when having reduced magnetic levitation motor processing stability, has brought certain potential safety hazard.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a magnetic suspension motor which has the advantages of improving the stability of the magnetic suspension motor and improving the running safety.

The above object of the present invention is achieved by the following technical solutions:

a magnetic suspension motor comprises a hollow shell and a fixed seat fixed at the bottom of the shell, wherein end covers are arranged at two ends of the shell, magnetic bearings are arranged at two ends inside the shell, coils are wound in the magnetic bearings, a rotating shaft is coaxially arranged between the two magnetic bearings, the inner diameter of each magnetic bearing is larger than the outer diameter of the corresponding rotating shaft, a socket for the rotating shaft to extend into is arranged on each end cover, rotating shaft stators are arranged at two ends of the rotating shaft and are coaxially arranged with the rotating shaft, rotating shaft rotors are arranged outside the rotating shaft stators and are coaxially arranged with the rotating shaft, the magnetic suspension motor further comprises an axial balance assembly and a radial balance assembly,

step sections are arranged at two ends of the rotating shaft, the axial balance assembly comprises two axial inductors arranged on the inner side walls of two ends of the shell, the axial inductors are arranged towards the step sections, the axial inductors and the step sections are positioned on the same horizontal line, and a gap is reserved between the axial inductors and the rotating shaft;

the radial balance assembly comprises a plurality of groups of radial inductors arranged on the rotor of the rotating shaft, two radial inductors are arranged in each group, and the two radial inductors in the same group are symmetrically arranged around the rotating shaft;

a power supply assembly disposed within the housing for supplying power to the magnetic bearing is also included.

By adopting the technical scheme, after the magnetic suspension motor is collided by the outside in the running process, if the rotating shaft of the motor axially shifts, the rotating shaft can be contacted with the axial inductor at one side of the moving direction, and the axial inductor adjusts the voltage input into the magnetic bearing at the side after sensing the rotating shaft, so that the magnetic force in the magnetic field changes, the rotating shaft moves towards the direction of the other side, and the axial balance of the rotating shaft is kept; if the rotating shaft of the motor generates radial displacement, the rotating shaft can be in contact with the radial inductor on one side of the moving direction, and after the radial inductor senses the rotating shaft, the voltage input into the magnetic bearing is adjusted, so that the magnetic force in the magnetic field is changed, the rotating shaft moves towards the direction of the other side, and the radial balance of the rotating shaft is kept. This application takes place the back that shifts at the perception pivot with the help of a plurality of axial inductors and radial inductor, can in time adjust the magnetic field in the motor for the equilibrium state can be got back to again to the pivot position, has improved magnetic levitation motor's stability, has improved the security of magnetic levitation motor when the operation.

The invention is further configured to: the radial inductors are four in number, the four radial inductors are arranged at intervals along the circumferential direction of the rotating shaft, and the distance between any two adjacent radial inductors is equal.

By adopting the technical scheme, the deflection direction of the rotating shaft can be more accurately known, and the position of the rotating shaft can be more timely adjusted after the rotating shaft shifts, so that the balance state of the rotating shaft can be better maintained.

The invention is further configured to: the socket department is provided with the protection axle sleeve, protection axle sleeve and the coaxial setting of pivot, just the internal diameter of protection axle sleeve is greater than the external diameter of pivot, the protection axle sleeve is fixed inside the shell.

Through adopting above-mentioned technical scheme, when taking place the outage accident suddenly, the condition that the whereabouts can take place for the effect of losing the magnetic force in the pivot, sets up the protection axle sleeve inside the shell, can reduce the pivot and lead to the impaired possibility of pivot with the shell collision, has further improved magnetic levitation motor's security.

The invention is further configured to: the protection shaft sleeve is characterized in that a rubber protection gasket is fixedly connected to the inner side wall of the protection shaft sleeve, and a plurality of rubber protection gaskets are arranged on the protection gasket at intervals along the circumferential direction of the protection shaft sleeve.

The invention is further configured to: the outer side wall of the end cover is provided with a locking cover, a groove is formed in one side face, facing the end cover, of the locking cover, and one end of the protection shaft sleeve extends into the groove.

Through adopting above-mentioned technical scheme, the locking lid also has improved the leakproofness of motor when playing to hide the protection axle sleeve effect, thereby has reduced dust, debris etc. in the air and has flown into the inside influence magnetic levitation motor running's possibility of motor, has improved the stability of magnetic levitation motor when the operation.

The invention is further configured to: the power supply assembly comprises a motor bearing arranged on the outer side of the rotating shaft, a motor stator and a motor rotor are sequentially arranged on the outer side of the motor bearing along the direction of keeping away from the rotating shaft, and the motor bearing, the motor stator and the motor rotor are all coaxially arranged with the rotating shaft.

The invention is further configured to: the outside of shell is provided with the buffer layer.

By adopting the technical scheme, the buffer layer on the outer side of the shell has a certain absorption effect on impact force generated by collision, and the impact force applied to the rotating shaft in the shell is reduced, so that the possibility of large-amplitude displacement of the rotating shaft is reduced, and the rotating shaft can be quickly restored to a balanced state.

The invention is further configured to: the bottom of shell is provided with a plurality of fin, and is a plurality of the fin is evenly set up along the length direction interval of casing.

Through adopting above-mentioned technical scheme, the fin has increased the foundation area of motor with the air, has improved the whole thermal diffusivity of motor to the stability of magnetic levitation motor when the operation has been improved.

The invention is further configured to: the shell is provided with two lifting rings, the two lifting rings are respectively positioned at two ends of the shell, and the axial direction of each lifting ring is consistent with the axial direction of the rotating shaft.

Through adopting above-mentioned technical scheme, thereby operating personnel can carry the bail at both ends and remove the magnetic levitation motor when removing the magnetic levitation motor, when making the magnetic levitation motor transport more convenient, also reduce the impact force that the magnetic levitation motor probably received when the transportation.

In conclusion, the beneficial technical effects of the invention are as follows:

1. by means of the axial inductors and the radial inductors, after the rotating shaft is sensed to be displaced, the magnetic field in the motor can be adjusted in time, so that the position of the rotating shaft can return to a balanced state again, the stability of the magnetic suspension motor is improved, and the safety of the magnetic suspension motor during operation is improved. (ii) a

2. When a power failure accident happens suddenly, the rotating shaft falls due to the action of lost magnetism, and the protective shaft sleeve is arranged in the shell, so that the possibility of damage to the rotating shaft caused by collision between the rotating shaft and the shell can be reduced, and the safety of the magnetic suspension motor is further improved;

3. the buffer layer is arranged on the outer side of the shell, the buffer layer has a certain absorption effect on impact force generated by collision, and impact force received by the rotating shaft in the shell is reduced, so that the possibility that the rotating shaft is greatly displaced is reduced, and the rotating shaft can be quickly restored to a balanced state.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a magnetic levitation motor;

FIG. 2 is a cross-sectional view of a magnetic levitation motor;

fig. 3 is an enlarged view of a portion a in fig. 2.

In the figure, 1, a housing; 11. a buffer layer; 12. a heat sink; 2. a fixed seat; 3. an end cap; 31. a socket; 32. a locking cover; 321. a groove; 33. a protective shaft sleeve; 331. a protective pad; 4. a magnetic bearing; 5. a rotating shaft; 51. a rotating shaft stator; 52. a rotating shaft rotor; 53. a stepped section; 6. an axial balancing assembly; 61. an axial inductor; 7. a radial balancing assembly; 71. a radial inductor; 8. a power supply assembly; 81. a motor bearing; 82. a motor stator; 83. a motor rotor; 9. and (5) lifting a ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the magnetic levitation motor disclosed by the invention comprises a cylindrical shell 1 with openings at two ends, the interior of the shell 1 is hollow, end covers 3 are arranged at the openings at two ends of the shell 1, the end covers 3 are detachably connected with the shell 1 through fixing screws, a socket 31 is arranged at the center of each end cover 3, and the socket 31 and the end cover 3 are coaxially arranged. Two fixing bases 2 of the lower part fixedly connected with of shell 1, two fixing bases 2 are located the both ends of shell 1 respectively, and fixing base 2 has played the stable effect of maintaining the magnetism floating motor. Be provided with one deck buffer layer 11 on the lateral wall of shell 1, buffer layer 11 has certain absorbing effect to the impact force that the collision produced, has reduceed the impact force that other parts received in the casing to magnetic levitation motor's stability has been improved.

Referring to fig. 2, two annular magnetic bearings 4 are provided inside the housing 1, the two magnetic bearings 4 are coaxially provided, the two magnetic bearings 4 are symmetrically provided about the axis of symmetry of the housing 1, and coils are wound inside the magnetic bearings 4. Be provided with a pivot 5 between two magnetic bearings 4, the axial of pivot 5 keeps unanimous with the axial of magnetic bearing 4, the external diameter of pivot 5 is less than the internal diameter of

magnetic bearing

4, 5 both ends of pivot are close socket 31 department and all are provided with step section 53, two sockets 31 departments at two 1 both ends of shell stretch out at the both ends of

pivot

5, 5 both ends of pivot are close to slot department and all are provided with pivot stator 51, pivot stator 51 sets up with the pivot 5 is coaxial, one side that pivot stator 51 deviates from pivot 5 is provided with pivot rotor 52, pivot rotor 52 sets up with the pivot 5 is coaxial.

Referring to fig. 2, a motor bearing 81 is arranged inside the housing 1, the motor bearing 81 is arranged coaxially with the rotating shaft 5, a motor stator 82 and a motor rotor 83 are sequentially arranged on a side wall of the motor bearing 81 departing from the rotating shaft 5 along a direction away from the rotating shaft 5, and the motor stator 82 and the motor rotor 83 are arranged coaxially with the rotating shaft 5. The power supply assembly 8 composed of the motor bearing 81, the motor stator 82 and the motor rotor 83 supplies power to the magnetic bearing 4, so that the magnetic bearing 4 generates magnetic force to drive the rotating shaft 5 to suspend in the motor.

Referring to fig. 2 and 3, the inner side walls of the two ends of the housing are respectively provided with an axial inductor 61, the two axial inductors 61 are both arranged towards the stepped section 53, the axial inductors 61 and the stepped section 53 are located on the same horizontal line, and a gap is reserved between the axial inductors 61 and the rotating shaft 5.

Referring to fig. 2 and 3, two sets of radial sensors 71 are disposed on the rotating shaft rotor 52, two radial sensors 71 in each set are disposed, two radial sensors 71 in the same set are symmetrically disposed about the rotating shaft 5, four radial sensors 71 are circumferentially spaced along the rotating shaft 5, and a distance between any two adjacent radial sensors 71 is equal.

Referring to fig. 2 and 3, a protection shaft sleeve 33 is arranged on the inner side of the socket 31, the protection shaft sleeve 33 is arranged coaxially with the rotating shaft 5, one side surface of the protection shaft sleeve 33, which is far away from the rotating shaft 5, is abutted against the inner wall of the socket 31, and a gap is left between one side surface of the protection shaft sleeve 33, which is close to the rotating shaft 5, and the rotating shaft 5, namely, the inner diameter of the protection shaft sleeve 33 is larger than the. When taking place the outage accident suddenly, the condition that the whereabouts can take place for the effect of losing the magnetic force for pivot 5, sets up protection axle sleeve 33 in shell 1 inside, can reduce pivot 5 and 1 collision of shell and lead to the impaired possibility of pivot 5, has further improved magnetic levitation motor's security. The outer side wall of the end cover 3 is connected with a locking cover 32 through a bolt, a groove 321 is formed in one side face, facing the end cover 3, of the locking cover 32, the diameter length of the groove 321 is equal to that of the socket 31, and one end of the protection shaft sleeve 33 extends into the socket 31. The locking cover 32 has the effect of hiding the protective shaft sleeve 33, improves the sealing performance of the motor, reduces the possibility that dust, sundries and the like in the air flow into the motor to influence the running of the magnetic suspension motor, and improves the stability of the magnetic suspension motor during operation.

Referring to fig. 2 and 3, a plurality of protection pads 331 are fixedly connected to an inner side wall of the protection shaft sleeve 33, the protection pads 331 are made of rubber, the protection pads 331 are uniformly arranged at intervals along a circumferential direction of the protection shaft sleeve 33, and a gap is left between the protection pads 331 and the rotating shaft 5. The protection pad 331 further protects the rotation shaft 5, and reduces the possibility of damage to the rotation shaft 5 due to falling off in case of power failure.

Referring to fig. 1 and 2, a plurality of cooling fins 12 are fixedly connected to the lower portion of the housing 1, the cooling fins 12 are located between the two fixing bases 2, and the plurality of cooling fins 12 are uniformly arranged along the length direction of the housing 1 at intervals. The radiating fins 12 increase the base area of the magnetic levitation motor and the air, and improve the overall heat dissipation performance of the motor, so that the stability of the magnetic levitation motor during operation is improved.

Referring to fig. 1, two lifting rings 9 are fixedly connected to the upper end of the housing 1, the two lifting rings 9 are respectively located at two ends of the housing 1, and the axial direction of the lifting rings 9 is consistent with the axial direction of the rotating shaft 5. When the operator moves the magnetic suspension motor, the lifting rings 9 at the two ends can be lifted to move the magnetic suspension motor, so that the magnetic suspension motor is more convenient to carry, and the impact force possibly applied to the magnetic suspension motor during transportation is reduced.

The implementation principle of the embodiment is as follows: in the running process of the magnetic suspension motor, after the magnetic suspension motor is collided by the outside, if the rotating shaft 5 of the motor is axially displaced, the rotating shaft 5 can be contacted with the axial inductor 61 at one side of the moving direction, and after the axial inductor 61 senses the rotating shaft 5, the voltage input into the magnetic bearing 4 at the side is adjusted, so that the magnetic force in the magnetic field is changed, the rotating shaft 5 moves towards the other side, and the axial balance of the rotating shaft 5 is kept; if the rotating shaft 5 of the motor is displaced radially, the rotating shaft 5 will contact with the radial inductor 71 on one side of the moving direction, and after the radial inductor 71 senses the rotating shaft 5, the voltage input into the magnetic bearing 4 is adjusted, so that the magnetic force in the magnetic field changes, and the rotating shaft 5 moves towards the other side direction, thereby maintaining the radial balance of the rotating shaft 5. This application is with the help of a plurality of axial inductors 61 and radial inductor 71, after the perception pivot 5 takes place to shift, can in time adjust the magnetic field in the motor for 5 positions of pivot can get back to balanced state again, have improved the stability of magnetic levitation motor, have improved the security of magnetic levitation motor when the operation.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a magnetic levitation motor, includes hollow shell (1) and fixes fixing base (2) in shell (1) bottom, shell (1) both ends all are provided with end cover (3), the inside both ends of shell (1) all are provided with magnetic bearing (4), around being equipped with the coil in magnetic bearing (4), two coaxial pivot (5) that are provided with between magnetic bearing (4), the internal diameter of magnetic bearing (4) is greater than the external diameter of pivot (5), set up socket (31) that supply pivot (5) to stretch into on end cover (3), its characterized in that: the two ends of the rotating shaft (5) are provided with rotating shaft stators (51), the rotating shaft stators (51) are coaxial with the rotating shaft (5), the outer side of the rotating shaft stators (51) is provided with a rotating shaft rotor (52), the rotating shaft rotor (52) is coaxial with the rotating shaft (5), the axial balance assembly (6) and the radial balance assembly (7) are further included,

step sections (53) are arranged at two ends of the rotating shaft (5), the axial balance assembly (6) comprises two axial inductors (61) arranged on the inner side walls of the two ends of the shell (1), the axial inductors (61) are arranged towards the step sections (53), the axial inductors (61) and the step sections (53) are located on the same horizontal line, and a gap is reserved between each axial inductor (61) and the rotating shaft (5);

the radial balance assembly (7) comprises a plurality of groups of radial inductors (71) arranged on the rotating shaft rotor (52), two radial inductors (71) are arranged in each group, and the two radial inductors (71) in the same group are symmetrically arranged relative to the rotating shaft (5);

and the power supply assembly (8) is arranged inside the shell (1) and used for supplying power to the magnetic bearing (4).

2. A magnetic levitation motor as recited in claim 1, wherein: the radial sensors (71) are four in number, the four radial sensors (71) are arranged along the circumferential direction of the rotating shaft (5) at intervals, and the distance between any two adjacent radial sensors (71) is equal.

3. A magnetic levitation motor as recited in claim 1, wherein: socket (31) department is provided with protection axle sleeve (33), protection axle sleeve (33) and pivot (5) coaxial setting, just the internal diameter of protection axle sleeve (33) is greater than the external diameter of pivot (5), protection axle sleeve (33) are fixed inside shell (1).

4. A magnetic levitation motor as recited in claim 3, wherein: the inner side wall of the protection shaft sleeve (33) is fixedly connected with a rubber protection gasket (331), and the protection gasket (331) is provided with a plurality of pieces at intervals along the circumferential direction of the protection shaft sleeve (33).

5. A magnetic levitation motor as recited in claim 3, wherein: a locking cover (32) is arranged on the outer side wall of the end cover (3), a groove (321) is formed in one side face, facing the end cover (3), of the locking cover (32), and one end of the protection shaft sleeve (33) extends into the groove (321).

6. A magnetic levitation motor as recited in claim 1, wherein: power supply unit (8) are including setting up motor bearing (81) in pivot (5) outside, motor bearing's (81) outside is along keeping away from pivot (5) direction and having set gradually motor stator (82), electric motor rotor (83), motor bearing (81), motor stator (82), electric motor rotor (83) all with pivot (5) coaxial setting.

7. A magnetic levitation motor as recited in claim 1, wherein: a buffer layer (11) is arranged on the outer side of the shell (1).

8. A magnetic levitation motor as recited in claim 1, wherein: the bottom of shell (1) is provided with a plurality of fin (12), and a plurality of fin (12) evenly set up along the length direction interval of casing.

9. A magnetic levitation motor as recited in claim 1, wherein: the lifting device is characterized in that two lifting rings (9) are arranged on the shell (1), the two lifting rings (9) are respectively located at two ends of the shell (1), and the axial direction of each lifting ring (9) is consistent with the axial direction of the rotating shaft (5).