CN216056700U - Magnetic suspension motor for improving dynamic balance debugging accuracy - Google Patents
Magnetic suspension motor for improving dynamic balance debugging accuracy Download PDFInfo
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- CN216056700U CN216056700U CN202122175834.4U CN202122175834U CN216056700U CN 216056700 U CN216056700 U CN 216056700U CN 202122175834 U CN202122175834 U CN 202122175834U CN 216056700 U CN216056700 U CN 216056700U
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Abstract
The utility model relates to the field of magnetic suspension motors, in particular to a magnetic suspension motor capable of improving dynamic balance debugging accuracy. The motor comprises a shell, a motor shaft, a motor stator, a magnetic bearing device and a plurality of radial and axial sensors; the radial and axial sensor is used for detecting the radial and axial displacement of the motor shaft; the side surfaces of two ends of the motor shaft are respectively provided with a first counterweight surface and a second counterweight surface, and the first counterweight surface and the second counterweight surface are both provided with a plurality of counterweight screw holes; the counterweight screws with corresponding weights are screwed at corresponding angles according to the dynamic balance debugging process through the counterweight screw holes of the first counterweight surface and the second counterweight surface, and the counterweight screws are used for offsetting the dynamic unbalance couple of the motor shaft. The motor improves the accuracy of dynamic balance debugging and reduces the debugging cost.
Description
Technical Field
The utility model relates to the field of magnetic suspension motors, in particular to a magnetic suspension motor capable of improving dynamic balance debugging accuracy.
Background
Rotor dynamic balancing is a common method for measuring and correcting the unbalance of a motor rotor. The imbalance directly affects the working performance and the service life of the engine, because the imbalance is one of the main reasons for causing excessive vibration of the rotor and generating noise. Therefore, the research on the dynamic balance technology of the rotor, particularly the flexible rotor, has important significance on the motor. In the motor industry, dynamic balance processing is required to be carried out on a rotor part of a motor so as to reduce vibration of the rotor during operation and prolong the service life of the motor.
The chinese utility model patent application (publication No. CN204145233U, published: 20150204) discloses a thermal dynamic balance auxiliary mechanism and a thermal dynamic balance measuring device for a motor rotor, which comprises a slip ring and a brush device matched with the slip ring, the thermal dynamic balance auxiliary mechanism further comprises a movable slip ring seat and a frequency converter; the movable slip ring seat is arranged on the dynamic balancing machine test platform and can slide back and forth or be fixed along the length direction of the dynamic balancing machine test platform, the electric brush device is arranged inside the movable slip ring seat, the slip ring is sleeved on one end of a rotating shaft of the motor rotor, one end of the rotating shaft of the motor rotor, which is sleeved with the slip ring, extends into the movable slip ring seat to be matched and aligned with the electric brush device, an outgoing cable of the motor rotor is connected with the slip ring, and the frequency converter is connected with the electric brush device through an external cable. The utility model can simulate the actual working state of the motor rotor to carry out thermal dynamic balance measurement on the motor rotor so as to enable the measurement result to be more accurate, can conveniently and quickly install and adjust the rotor in place in the measurement preparation work, saves time and labor and improves the working efficiency.
The prior art has the following defects: the traditional dynamic balancing machine can only imitate a rotor shafting supporting point to carry out dynamic balancing of a rotor, and the working rotating speed of the dynamic balancing machine is far lower than the actual working rotating speed of a motor; therefore, the unbalance amount of the rotor shaft system at the actual high rotating speed is difficult to be ensured to be smaller than an allowable value, and the accuracy of dynamic balance debugging is further reduced. Meanwhile, rotor shafting with different weights also needs to be matched with dynamic balancing machines with different bearing capacities; when a plurality of rotor shafts need to be subjected to dynamic balance debugging, a plurality of dynamic balancing machines need to be prepared, and the debugging cost is further increased.
Disclosure of Invention
The purpose of the utility model is: aiming at the problems, the magnetic suspension motor is used for providing the actual working rotating speed of the motor shaft, and the radial and axial sensors of the magnetic suspension motor are used for detecting the actual unbalance amount of the motor shaft at the rotating speed from low to high; the side surfaces of the two ends of the motor shaft are respectively provided with a first counterweight surface and a second counterweight surface, and a dynamic unbalance couple of the motor shaft is counteracted by using a counterweight screw according to a detection result; therefore, the motor shaft can carry out dynamic balance debugging at the actual working rotating speed, and the accuracy of dynamic balance debugging is improved; meanwhile, the detection of the actual working rotating speed and the unbalance amount is provided by the magnetic suspension motor, and the plurality of magnetic suspension motors with rotor shafting of different weights do not need to be matched with the plurality of dynamic balancing machines when carrying out dynamic balance debugging, so that the debugging cost is reduced, and the accuracy of dynamic balance debugging is improved.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a magnetic suspension motor for improving dynamic balance debugging accuracy comprises a shell, a motor shaft, a motor stator, a magnetic bearing device and a plurality of radial and axial sensors; the motor stator is sleeved on the outer wall of the motor shaft and fixedly embedded in an inner hole of the shell, the motor shaft is fixedly provided with a motor rotor, and the motor rotor corresponds to the motor stator in position; the magnetic bearing device and the radial and axial sensor are sleeved on the outer wall of the motor shaft, and the radial and axial sensor is used for detecting the displacement of the motor shaft in the radial direction and the axial direction; the side surfaces of two ends of the motor shaft are respectively provided with a first counterweight surface and a second counterweight surface, and the first counterweight surface and the second counterweight surface are both provided with a plurality of counterweight screw holes; the counterweight screws with corresponding weights are screwed at corresponding angles according to the dynamic balance debugging process through the counterweight screw holes of the first counterweight surface and the second counterweight surface, and the counterweight screws are used for offsetting the dynamic unbalance couple of the motor shaft.
Preferably, the plurality of balance weight screw holes are distributed in a circumferential direction with respect to a center of the motor shaft.
Preferably, and the angle between two adjacent counterweight screw holes in the circumferential direction is 15 °.
Preferably, the magnetic bearing device comprises a plurality of radial magnetic bearings and axial magnetic bearings which are positioned at two ends of the motor shaft, and the radial magnetic bearings and the axial magnetic bearings are sleeved on the outer wall of the motor shaft and fixedly embedded in the inner hole of the shell; the outer wall of the motor shaft is fixedly sleeved with a radial bearing rotor and a thrust disc, the radial bearing rotor corresponds to the radial magnetic bearings in position, and the two axial magnetic bearings are respectively positioned at the two axial ends of the thrust disc.
Preferably, the radial bearing rotor is a plurality of axially stacked silicon steel sheets, and the radial and axial sensor detects the radial and axial positions of the motor shaft by detecting the radial and axial displacements of the radial bearing rotor.
Preferably, the radial and axial sensor comprises a sensor steel sheet and a sensor coil, and the sensor steel sheet is provided with a plurality of coil fixing parts; the sensor coils are respectively and fixedly wound on the coil fixing parts at corresponding positions, and are arranged along the center of the motor shaft in a radial direction in a pairwise symmetrical mode.
Preferably, the center lines of a plurality of pairs of sensor coils which are symmetrically arranged in pairs are perpendicular to each other.
Preferably, the outer wall of one end of the motor shaft is provided with a 0-degree mark line, and the 0-degree mark line is used for being detected by the infrared angle measuring instrument to further obtain the angle of the motor shaft dynamic unbalance.
As preferred, the fixed cover of motor shaft outer wall is equipped with the magnet steel sheath, and the magnet steel sheath is used for preventing that motor rotor from receiving the damage.
Preferably, the shell comprises a motor barrel, a front protection bearing seat and a rear protection bearing seat, and the front protection bearing seat and the rear protection bearing seat are respectively fixed at two ends of the motor barrel; the motor stator and the magnetic bearing device are fixedly embedded in an inner hole of the motor cylinder. The front protection bearing seat and the rear protection bearing seat are both provided with protection bearing inner holes, and the magnetic suspension motor is also provided with a protection bearing; the protection bearing sleeves are arranged on the outer wall of the motor shaft and are respectively positioned in protection bearing inner holes of the front protection bearing seat and the rear protection bearing seat, the protection bearing outer ring is in interference fit with the protection bearing inner holes, and a gap exists between the protection bearing inner ring and the outer wall of the motor shaft.
The magnetic suspension motor adopting the technical scheme for improving the dynamic balance debugging accuracy has the advantages that:
the motor stator of the magnetic suspension motor is used for driving the motor rotor to rotate so as to provide the actual working rotating speed of the motor shaft, and the radial and axial sensors of the magnetic suspension motor are used for detecting the actual unbalance amount of the motor shaft from low to high rotating speed; then calculating the angle and the weight of the counterweight screw which needs to be added on the first counterweight surface and the second counterweight surface at the actual working rotating speed of the motor shaft through a set algorithm, and decomposing the angle and the weight into the required counterweight at the angle of the corresponding counterweight screw hole; therefore, the motor shaft can be subjected to dynamic balance debugging at the actual working rotating speed, and the accuracy of dynamic balance debugging is improved. Meanwhile, in the mode, the detection of the actual working rotating speed and the unbalance is provided by the magnetic suspension motor, and the dynamic balancing machine is not needed for debugging; therefore, the magnetic suspension motors with rotor shafting of different weights do not need to be matched with a plurality of dynamic balancing machines when being used for dynamic balance debugging, and the debugging cost is further reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2-4 are schematic views of motor shaft configurations.
Fig. 5 is a schematic view of the motor shaft in the direction a.
Fig. 6 and 7 are schematic structural views of the counterweight screws.
Fig. 8 is a schematic structural view of the radial-axial sensor.
Fig. 9 and 10 are schematic structural views of the sensor coil.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings.
Example 1
A magnetic suspension motor for improving the debugging accuracy of dynamic balance as shown in fig. 1-7, the motor comprises a housing 1, a motor shaft 2, a motor stator 3, a magnetic bearing device 4 and a plurality of radial-axial sensors 5; the motor stator 3 is sleeved on the outer wall of the motor shaft 2 and fixedly embedded in an inner hole of the shell 1, the motor shaft 2 is fixedly provided with a motor rotor 21, and the position of the motor rotor 21 corresponds to that of the motor stator 3; the magnetic bearing device 4 and the radial and axial sensor 5 are sleeved on the outer wall of the motor shaft 2, and the radial and axial sensor 5 is used for detecting the radial and axial displacement of the motor shaft 2; the side surfaces of two ends of the motor shaft 2 are respectively provided with a first counterweight surface 22 and a second counterweight surface 23, and the first counterweight surface 22 and the second counterweight surface 23 are both provided with a plurality of counterweight screw holes 24; the counterweight screw holes 24 of the first counterweight surface 22 and the second counterweight surface 23 are screwed with counterweight screws 25 with corresponding weights at corresponding angles according to a dynamic balance debugging process, and the counterweight screws 25 are used for offsetting the dynamic unbalance couple of the motor shaft 2. In the mode, the motor stator 3 of the magnetic suspension motor is used for driving the motor rotor 21 to rotate so as to provide the actual working rotating speed of the motor shaft 2, and the radial and axial sensor 5 of the magnetic suspension motor is used for detecting the actual unbalance amount of the motor shaft 2 at the rotating speed from low to high; then, the angle and the weight of a counterweight screw 25 which needs to be added on the first counterweight surface 22 and the second counterweight surface 23 when the motor shaft 2 rotates at the actual working rotating speed are calculated through a set algorithm, and the calculated angle and the calculated weight are decomposed into the required counterweight at the angle of the corresponding counterweight screw hole 24; therefore, the motor shaft 2 can be subjected to dynamic balance debugging at the actual working rotating speed, and the accuracy of dynamic balance debugging is improved. Meanwhile, in the mode, the detection of the actual working rotating speed and the unbalance is provided by the magnetic suspension motor, and the dynamic balancing machine is not needed for debugging; therefore, the magnetic suspension motors with rotor shafting of different weights do not need to be matched with a plurality of dynamic balancing machines when being used for dynamic balance debugging, and the debugging cost is further reduced.
A plurality of balance weight screw holes 24 are distributed in the circumferential direction with respect to the center of the motor shaft 2; the angle between two adjacent weight screw holes 24 in the circumferential direction is 15 °.
The magnetic bearing device 4 comprises a plurality of radial magnetic bearings 41 and axial magnetic bearings 42 which are positioned at two ends of the motor shaft 2, and the radial magnetic bearings 41 and the axial magnetic bearings 42 are sleeved on the outer wall of the motor shaft 2 and fixedly embedded in the inner hole of the shell 1; the outer wall of the motor shaft 2 is fixedly sleeved with a radial bearing rotor 26 and a thrust disc 27, the radial bearing rotor 26 corresponds to the radial magnetic bearing 41, and the two axial magnetic bearings 42 are respectively positioned at two axial ends of the thrust disc 23. The radial magnetic bearing 41 controls the radial bearing rotor 26 to further realize radial support of the motor shaft 2, and the axial magnetic bearing 42 controls the thrust disc 23 to further realize axial limit of the motor shaft 2.
The radial bearing rotor 26 is a plurality of axially stacked silicon steel sheets, and the radial and axial sensor 5 detects the radial and axial positions of the motor shaft 2 by detecting the radial and axial displacements of the radial bearing rotor 26.
As shown in fig. 8 to 10, the radial-axial sensor 5 includes a sensor steel sheet 51 and a sensor coil 52, the sensor steel sheet 51 being provided with a plurality of coil fixing portions 53; the plurality of sensor coils 52 are fixedly wound around the coil fixing portions 53 at the corresponding positions, respectively, and the plurality of sensor coils 52 are arranged two by two symmetrically in the radial direction along the center of the motor shaft 2. The center lines of the pairs of sensor coils 52 arranged two by two are perpendicular to each other.
As shown in fig. 5, a 0 ° mark line 28 is disposed on an outer wall of one end of the motor shaft 2, and the 0 ° mark line 28 is used for being detected by the infrared angle measuring instrument to obtain an angle of the dynamic unbalance of the motor shaft 2.
As shown in fig. 3, a magnetic steel sheath 29 is fixedly sleeved on the outer wall of the motor shaft 2, and the magnetic steel sheath 29 is used for preventing the motor rotor 21 from being damaged.
As shown in fig. 1, the casing 1 comprises a motor barrel 11, a front protective bearing seat 12 and a rear protective bearing seat 13, wherein the front protective bearing seat 12 and the rear protective bearing seat 13 are respectively fixed at two ends of the motor barrel 11; the motor stator 3 and the magnetic bearing device 4 are fixedly embedded in an inner hole of the motor barrel 11.
The front protective bearing seat 12 and the rear protective bearing seat 13 are both provided with protective bearing inner holes 121, and the magnetic suspension motor is also provided with a protective bearing 6; the protection bearings 6 are sleeved on the outer wall of the motor shaft 2 and are respectively located in protection bearing inner holes 121 of the front protection bearing seat 12 and the rear protection bearing seat 13, the outer rings of the protection bearings 6 are in interference fit with the protection bearing inner holes 121, and gaps exist between the inner rings of the protection bearings 6 and the outer wall of the motor shaft 2. When the equipment is suddenly powered off or stopped, the radial magnetic bearing 41 and the axial magnetic bearing 42 lose magnetic force and can not support and limit the motor shaft 2, and at the moment, the motor shaft 2 falls down and contacts with the inner ring of the protective bearing 6 to be supported by the protective bearing 6; thereby avoiding the damage of important parts such as the radial magnetic bearing 41 and the axial magnetic bearing 42 caused by the sudden drop of the motor shaft 2 when the motor is suddenly powered off or stopped.
When the magnetic suspension motor is used for dynamic balance debugging: (S1) the motor stator 3 is energized to drive the motor rotor 21 to rotate and further drive the motor shaft 2 to rotate at the lowest set speed; (S2) detecting the maximum offset position of the motor shaft 2 by the radial-axial sensors 5 at both ends of the motor shaft 2, and judging whether the maximum offset position is less than an allowable value; if the maximum deviation position is not less than the allowable value, performing the step (S3), otherwise performing the step (S6); (S3) detecting the unbalance amount of the rotor shaft system through radial and axial sensors 5 at two ends of the motor shaft 2, and measuring a 0-degree mark line through an infrared corner measuring instrument to obtain the angle of the unbalance amount; (S4) calculating the angle and weight of the weight screw 25 to be added by a set algorithm, and decomposing the calculated angle and weight into the required weight corresponding to the angle of the weight screw hole 24; (S5) after measuring the weight screw 25 of the required corresponding weight by the electronic analytical balance, fastening the weight screw 25 in the weight screw hole 24 of the calculated corresponding angle, and then performing the step (S2); (S6) stepwise increasing the rotation speed of the motor shaft 2 by a set amplitude, and judging whether the increased rotation speed reaches the maximum rotation speed of the motor shaft 2; if the maximum rotating speed of the motor shaft 2 is not reached, executing the step (S2); and if the highest rotating speed of the motor shaft 2 is reached, finishing the dynamic balance debugging process.
Claims (10)
1. A magnetic suspension motor for improving dynamic balance debugging accuracy is characterized by comprising a shell (1), a motor shaft (2), a motor stator (3), a magnetic bearing device (4) and a plurality of radial and axial sensors (5); the motor stator (3) is sleeved on the outer wall of the motor shaft (2) and fixedly embedded in an inner hole of the shell (1), the motor shaft (2) is fixedly provided with a motor rotor (21), and the position of the motor rotor (21) corresponds to that of the motor stator (3); the magnetic bearing device (4) and the radial and axial sensor (5) are sleeved on the outer wall of the motor shaft (2), and the radial and axial sensor (5) is used for detecting the radial and axial displacement of the motor shaft (2); the side surfaces of two ends of the motor shaft (2) are respectively provided with a first counterweight surface (22) and a second counterweight surface (23), and the first counterweight surface (22) and the second counterweight surface (23) are both provided with a plurality of counterweight screw holes (24); the counterweight screw holes (24) of the first counterweight surface (22) and the second counterweight surface (23) are provided with counterweight screws (25) with corresponding weights in a screwing mode at corresponding angles according to a dynamic balance debugging process, and the counterweight screws (25) are used for offsetting a dynamic unbalance couple of the motor shaft (2).
2. A magnetic levitation motor for improving the debugging accuracy of dynamic balance as claimed in claim 1, wherein a plurality of counterweight screw holes (24) are distributed along the circumferential direction with respect to the center of the motor shaft (2).
3. The magnetic suspension motor for improving the debugging accuracy of dynamic balance of claim 1, wherein the angle between two adjacent counterweight screw holes (24) in the circumferential direction is 15 °.
4. The magnetic suspension motor for improving the debugging accuracy of dynamic balance as claimed in claim 1, wherein the magnetic bearing device (4) comprises a plurality of radial magnetic bearings (41) and axial magnetic bearings (42) which are positioned at two ends of the motor shaft (2), and the radial magnetic bearings (41) and the axial magnetic bearings (42) are sleeved on the outer wall of the motor shaft (2) and fixedly embedded in the inner hole of the shell (1); the outer wall of the motor shaft (2) is fixedly sleeved with a radial bearing rotor (26) and a thrust disc (27), the radial bearing rotor (26) corresponds to the radial magnetic bearing (41), and the two axial magnetic bearings (42) are respectively positioned at two axial ends of the thrust disc (27).
5. The magnetic suspension motor for improving the debugging accuracy of dynamic balance as claimed in claim 4, characterized in that the radial bearing rotor (26) is a plurality of silicon steel sheets stacked axially, and the radial and axial sensor (5) detects the radial and axial position of the motor shaft (2) by detecting the radial and axial displacement of the radial bearing rotor (26).
6. The magnetic levitation motor for improving the debugging accuracy of dynamic balance as claimed in claim 1, wherein the radial and axial sensor (5) comprises a sensor steel plate (51) and a sensor coil (52), the sensor steel plate (51) is provided with a plurality of coil fixing parts (53); the plurality of sensor coils (52) are respectively fixedly wound on the coil fixing parts (53) at corresponding positions, and the plurality of sensor coils (52) are arranged in a pairwise symmetry manner along the center of the motor shaft (2) in the radial direction.
7. The magnetic suspension motor for improving the debugging accuracy of dynamic balance as claimed in claim 6, characterized in that the center lines of a plurality of pairs of sensor coils (52) which are symmetrically arranged two by two are perpendicular to each other.
8. The magnetic suspension motor for improving the debugging accuracy of dynamic balance as claimed in claim 1, characterized in that the outer wall of one end of the motor shaft (2) is provided with a 0 ° mark line (28), and the 0 ° mark line (28) is used for being detected by an infrared angle measuring instrument to obtain the angle of the dynamic unbalance of the motor shaft (2).
9. The magnetic suspension motor for improving the debugging accuracy of dynamic balance as claimed in claim 1, characterized in that the outer wall of the motor shaft (2) is fixedly sleeved with a magnetic steel sheath (29), and the magnetic steel sheath (29) is used for preventing the motor rotor (21) from being damaged.
10. The magnetic suspension motor for improving the debugging accuracy of the dynamic balance is characterized in that the shell (1) comprises a motor barrel (11), a front protection bearing seat (12) and a rear protection bearing seat (13), wherein the front protection bearing seat (12) and the rear protection bearing seat (13) are respectively fixed at two ends of the motor barrel (11); the motor stator (3) and the magnetic bearing device (4) are fixedly embedded in an inner hole of the motor barrel (11); the front protection bearing seat (12) and the rear protection bearing seat (13) are both provided with protection bearing inner holes (121), and the magnetic suspension motor is also provided with a protection bearing (6); a plurality of protection bearings (6) are sleeved on the outer wall of the motor shaft (2) and are respectively located in protection bearing inner holes (121) of the front protection bearing seat (12) and the rear protection bearing seat (13), the outer rings of the protection bearings (6) are in interference fit with the protection bearing inner holes (121), and gaps exist between the inner rings of the protection bearings (6) and the outer wall of the motor shaft (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122175834.4U CN216056700U (en) | 2021-09-09 | 2021-09-09 | Magnetic suspension motor for improving dynamic balance debugging accuracy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122175834.4U CN216056700U (en) | 2021-09-09 | 2021-09-09 | Magnetic suspension motor for improving dynamic balance debugging accuracy |
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| Publication Number | Publication Date |
|---|---|
| CN216056700U true CN216056700U (en) | 2022-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122175834.4U Active CN216056700U (en) | 2021-09-09 | 2021-09-09 | Magnetic suspension motor for improving dynamic balance debugging accuracy |
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| Country | Link |
|---|---|
| CN (1) | CN216056700U (en) |
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2021
- 2021-09-09 CN CN202122175834.4U patent/CN216056700U/en active Active
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