Active anti-falling system for rotor of heavy magnetic suspension motor

Abstract

The invention belongs to the technical field of magnetic suspension motors, and relates to a heavy magnetic suspension motor rotor active anti-falling system, which comprises a heavy magnetic suspension motor rotor, and anti-falling magnetic bearings and displacement sensor groups are respectively arranged on the heavy magnetic suspension motor rotor close to two ends of the heavy magnetic suspension motor rotor. The signal output end of the displacement sensor group is in communication connection with a main controller, the signal output end of the main controller is electrically connected with the control end of the anti-falling magnetic bearing, and the displacement sensor group is used for detecting a position signal of the heavy magnetic suspension motor rotor and sending the position signal to the main controller in real time; when the position of the heavy magnetic suspension motor rotor changes suddenly, the main controller controls the anti-falling magnetic bearing to work to generate magnetic suspension force for adjusting the position of the heavy magnetic suspension motor rotor to prevent the risk of falling. It is ensured that the magnetic suspension rotor running under the high-speed and heavy-load condition can be rapidly and effectively prevented from falling off when encountering the risk of instability, and safe and stable running of equipment is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic suspension motors, and in particular relates to an active anti-falling system for a heavy-duty magnetic suspension motor rotor. Background Art

[0002] With the continuous development of industrial technology, heavy machinery and equipment are being used more and more widely in various fields. Among them, the safety and stability of magnetic levitation motors, as the core components of high-speed and heavy-load equipment, are crucial to the operation of the entire equipment. However, the mechanical conditions to which the rotors of heavy-duty magnetic levitation motors are subjected during operation are complex and changeable. Once instability occurs, the impact force of the rotor falling will cause serious damage to the equipment and even cause safety accidents.

[0003] At present, although there are some devices on the market to prevent the rotor from falling, the Chinese patent with patent application number CN201910840619.6 discloses an active magnetic levitation rotor fall protection system, which consists of a controller, a distance sensor, an actuator and a drive device; the radial support of the two shaft ends of the magnetic levitation rotor is realized by the outer ring of the magnetic bearing and the inner ring of the magnetic bearing, and the axial support of the two shaft ends of the magnetic levitation rotor is realized by the axial magnetic bearing; the controller is an independent control unit, which can be made of control elements such as proportional circuits and microcontrollers; the distance sensors are located at both ends of the magnetic levitation rotor to detect the spatial displacement state of the rotor; the actuator can be driven by the driver according to the instructions of the controller to perform the lifting action of the magnetic levitation rotor; according to the measurement data of the sensor, the protection system can effectively control the displacement fluctuation of the magnetic levitation rotor to avoid damage caused by rotor instability.

[0004] The above-mentioned existing magnetic levitation rotor fall protection system adopts a distance measuring sensor to detect the position state of the rotor at all times, and controls the actuator to work through a controller and a driver according to the position state of the rotor, so as to adjust the displacement fluctuation of the magnetic levitation rotor. However, most of the existing magnetic levitation rotor fall protection systems are designed for light or medium-sized equipment. For heavy magnetic levitation rotors, their protection effect is not ideal; and the overall structure of this type of existing anti-fall system is complex and needs to work continuously, resulting in high overall energy consumption and high use cost during use, which seriously affects the use effect. Summary of the invention

[0005] The main technical problem to be solved by the present invention is to provide an active anti-falling system for heavy-duty magnetic levitation motor rotors, which can ensure that the magnetic levitation rotors running under high-speed and heavy-load conditions can be quickly and effectively prevented from falling when facing the risk of instability through an active protection mechanism, thereby ensuring the safe and stable operation of the equipment.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A heavy-duty magnetic levitation motor rotor active anti-drop system comprises a heavy-duty magnetic levitation motor rotor, on which anti-drop magnetic bearings and displacement sensor groups are respectively arranged near both ends of the heavy-duty magnetic levitation motor rotor, a signal output end of the displacement sensor group is communicatively connected to a main controller, a signal output end of the main controller is electrically connected to a control end of the anti-drop magnetic bearing, the displacement sensor group is used to detect a position signal of the heavy-duty magnetic levitation motor rotor and send it to the main controller in real time, and when the position of the heavy-duty magnetic levitation motor rotor suddenly changes, the main controller controls the anti-drop magnetic bearing to generate a magnetic levitation force for adjusting the position of the heavy-duty magnetic levitation motor rotor to prevent the risk of falling.

[0007] The following is a further optimization of the above technical solution by the present invention: The anti-drop magnetic bearing comprises a magnetic conductive core, a central hole is opened in the middle of the magnetic conductive core, and four mounting parts are integrally connected to the inner surface of the central hole, and the mounting parts are annular and arranged at equal intervals.

[0008] Further optimization: Coils are respectively installed on the installation part, and the four coils are the first coil, the second coil, the third coil and the fourth coil in the order of top right bottom left.

[0009] Further optimization: the signal output end of the main controller is electrically connected to four bearing drivers, and the four bearing drivers are respectively a first bearing driver, a second bearing driver, a third bearing driver and a fourth bearing driver.

[0010] Further optimization: the power output end of the first bearing driver is electrically connected to the power supply end of the first coil; the power output end of the second bearing driver is electrically connected to the power supply end of the second coil; the power output end of the third bearing driver is electrically connected to the power supply end of the third coil; the power output end of the fourth bearing driver is electrically connected to the power supply end of the fourth coil.

[0011] Further optimization: the main controller sends a control signal for independently adjusting the current value of the output power supply corresponding to the first bearing driver, the second bearing driver, the third bearing driver and the fourth bearing driver; by adjusting the current of different values ​​passing through the four coils, the direction and magnitude of the magnetic attraction force of the anti-drop magnetic bearing can be controlled.

[0012] Further optimization: each displacement sensor group includes at least one displacement sensor.

[0013] Further optimization: Auxiliary protective bearings are respectively provided on the heavy-duty magnetic levitation motor rotor near its two ends.

[0014] Further optimization: An axial magnetic bearing is arranged on the heavy-duty magnetic levitation motor rotor near one end thereof; the axial magnetic bearing generates magnetic force for constraining the axial position of the heavy-duty magnetic levitation motor rotor when in operation.

[0015] Further optimization: Two radial magnetic bearings are sleeved on the heavy-duty magnetic levitation motor rotor, and the two radial magnetic bearings are respectively arranged at two end positions close to the heavy-duty magnetic levitation motor rotor.

[0016] The present invention adopts the above technical solution and has the following beneficial effects: 1. Active protection mechanism: The position of the heavy-duty magnetic levitation motor rotor is monitored in real time through the displacement sensor group. When the position of the heavy-duty magnetic levitation motor rotor changes suddenly, the main controller controls the four bearing drivers to work, and controls the direction and size of the magnetic attraction of the anti-drop magnetic bearing by adjusting the current of different values ​​passed through the four coils, thereby suppressing the sudden displacement of the heavy-duty magnetic levitation motor rotor, realizing effective prevention and control of the risk of rotor falling, and improving the safety and stability of the equipment.

[0017] 2. Suitable for heavy equipment: Designed according to the characteristics of heavy-duty magnetic levitation motors, it can withstand greater impact force and load, and meet the safety protection needs of heavy equipment.

[0018] 3. Intelligent control: The main controller can adjust the working status of the magnetic levitation motor and active protection in real time according to the status information of the rotor, realize intelligent control, and improve the operating efficiency of the equipment.

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the anti-drop magnetic bearing in an embodiment of the present invention; Figure 3 Schematic diagram of a control system in an embodiment of the present invention.

[0021] In the figure: 1-heavy-duty magnetic levitation motor rotor; 2-auxiliary protection bearing; 3-anti-drop magnetic bearing; 301-magnetic core; 302-mounting part; 303-coil; 4-axial magnetic bearing; 5-radial magnetic bearing; 6-displacement sensor group. DETAILED DESCRIPTION

[0022] like Figure 1-3As shown: an active anti-drop system for a heavy-duty magnetic levitation motor rotor, comprising a heavy-duty magnetic levitation motor rotor 1, on which anti-drop magnetic bearings 3 and a displacement sensor group 6 are respectively arranged near both ends of the heavy-duty magnetic levitation motor rotor 1, wherein a signal output end of the displacement sensor group 6 is communicatively connected to a main controller, and a signal output end of the main controller is electrically connected to a control end of the anti-drop magnetic bearing 3, wherein the displacement sensor group 6 is used to detect a position signal of the heavy-duty magnetic levitation motor rotor 1 and send it to the main controller in real time, and when the position of the heavy-duty magnetic levitation motor rotor 1 suddenly changes, the main controller controls the anti-drop magnetic bearing 3 to generate a magnetic levitation force for adjusting the position of the heavy-duty magnetic levitation motor rotor 1 to prevent a risk of falling.

[0023] In this embodiment, the heavy-duty magnetic levitation motor rotor 1 is installed on the heavy-duty magnetic levitation motor. The heavy-duty magnetic levitation motor rotor 1 has a large mass and moment of inertia and is a core component of the heavy-duty magnetic levitation motor.

[0024] The heavy-duty magnetic levitation motor rotor 1 is provided with auxiliary protection bearings 2 near both ends thereof. The auxiliary protection bearings 2 are high-speed mechanical bearings and are used for providing auxiliary protection to the heavy-duty magnetic levitation motor rotor 1 .

[0025] An axial magnetic bearing 4 is provided on the heavy-duty magnetic levitation motor rotor 1 near one end thereof, and the axial magnetic bearing 4 generates magnetic force to constrain the axial position of the heavy-duty magnetic levitation motor rotor 1 to prevent the axial position of the heavy-duty magnetic levitation motor rotor 1 from shifting.

[0026] Two radial magnetic bearings 5 ​​are sleeved on the heavy-duty magnetic levitation motor rotor 1 , and the two radial magnetic bearings 5 ​​are respectively arranged near two end positions of the heavy-duty magnetic levitation motor rotor 1 .

[0027] The two radial magnetic bearings 5 ​​are powered on to work and generate magnetic force, through which the heavy-duty magnetic levitation motor rotor 1 is suspended, thereby ensuring that the heavy-duty magnetic levitation motor rotor 1 can rotate concentrically during operation, which is convenient to use.

[0028] In this embodiment, the magnetic force generated by the radial magnetic bearing 5 can also be used to constrain the radial position of the heavy-duty magnetic levitation motor rotor 1, thereby ensuring the concentric rotation of the heavy-duty magnetic levitation motor rotor 1, which is convenient to use.

[0029] In this embodiment, the axial magnetic bearing 4 and the radial magnetic bearing 5 are both prior art, and their specific structures are not described in detail here.

[0030] There are two displacement sensor groups 6, and the two displacement sensor groups 6 are arranged at two end positions of the heavy-duty magnetic levitation motor rotor 1. The displacement sensor 6 is used to monitor the position of the heavy-duty magnetic levitation motor rotor 1 in real time and send it to the main controller.

[0031] In this embodiment, each displacement sensor group 6 includes at least one displacement sensor.

[0032] The anti-drop magnetic bearing 3 includes a permeable magnetic core 301 , a central hole is opened in the middle of the permeable magnetic core 301 , and four mounting parts 302 are integrally connected to the inner surface of the central hole. The mounting parts 302 are annular and arranged at equal intervals.

[0033] Coils 303 are respectively installed on the installation part 302 , and the four coils 303 are a first coil, a second coil, a third coil and a fourth coil in the order of top right bottom left.

[0034] The signal output end of the main controller is electrically connected to four bearing drivers, which are respectively a first bearing driver, a second bearing driver, a third bearing driver and a fourth bearing driver.

[0035] The power output end of the first bearing driver is electrically connected to the power supply end of the first coil; the first bearing driver is used to supply power to the first coil.

[0036] The power output end of the second bearing driver is electrically connected to the power supply end of the second coil; the second bearing driver is used to supply power to the second coil.

[0037] The power output end of the third bearing driver is electrically connected to the power supply end of the third coil; the third bearing driver is used to supply power to the third coil.

[0038] The power output end of the fourth bearing driver is electrically connected to the power supply end of the fourth coil; the fourth bearing driver is used to supply power to the fourth coil.

[0039] The main controller sends out a control signal for independently adjusting the current value of the output power supply corresponding to the first bearing driver, the second bearing driver, the third bearing driver and the fourth bearing driver.

[0040] With this design, when the displacement sensor 6 detects that the heavy-duty magnetic levitation motor rotor 1 is unstable, the anti-fall magnetic bearing 3 is energized to generate damping to prevent the heavy-duty magnetic levitation motor rotor 1 from falling and contacting the auxiliary protection bearing 2.

[0041] In this embodiment, there are two anti-drop magnetic bearings 3, and the two anti-drop magnetic bearings 3 are arranged at the two ends of the heavy-duty magnetic levitation motor rotor 1. When the heavy-duty magnetic levitation motor rotor 1 operates normally, the anti-drop magnetic bearings 3 do not work, and at this time, the anti-drop magnetic bearings 3 have no additional energy consumption.

[0042] When the displacement sensor 6 detects that the displacement of the heavy-duty magnetic levitation motor rotor 1 has a sudden change and there is a risk of falling, the displacement sensor 6 transmits the detection signal to the main controller. At this time, the main controller sends a control signal to control the corresponding bearing driver to work so that a certain value of current is passed through the corresponding coil 303; after the current is passed through, the anti-fall magnetic bearing 3 will work to generate a magnetic attraction on the heavy-duty magnetic levitation motor rotor 1; and by adjusting the four coils 303 to pass different values ​​of current, the direction and size of the magnetic attraction can be controlled, and the sudden displacement of the heavy-duty magnetic levitation motor rotor 1 can be suppressed by the magnetic attraction.

[0043] Specific examples: Figure 1-2 As shown: taking the sudden downward displacement of the heavy-duty magnetic levitation motor rotor 1 as an example, the coil 303 that generates an upward magnetic attraction force on the heavy-duty magnetic levitation motor rotor 1 is the first coil; when the displacement sensor group 6 detects that the displacement of the heavy-duty magnetic levitation motor rotor 1 suddenly changes downward, the main controller sends a control signal to control the first bearing driver to work and pass a certain value of current into the first coil 303. At this time, the first coil 303 generates an upward magnetic attraction force on the magnetic levitation motor rotor 1, thereby ensuring that the magnetic levitation motor rotor 1 will not fall. The risk of friction between the magnetic levitation motor rotor 1 and the auxiliary protection bearing 2 is avoided, and damage to the heavy-duty magnetic levitation motor rotor 1 is avoided, thereby improving safety during use.

[0044] The present invention adopts the above-mentioned technical scheme, and uses the displacement sensor 6 to detect the displacement signal of the heavy-duty magnetic levitation motor rotor 1 and send it to the main controller. When the displacement sensor 6 detects that the heavy-duty magnetic levitation motor rotor 1 has a risk of falling, the main controller sends a control signal to control the corresponding bearing driver to work so that a certain value of current is passed through the corresponding coil 303; after the current is passed through, the anti-fall magnetic bearing 3 will work to generate a magnetic attraction force on the heavy-duty magnetic levitation motor rotor 1; and by adjusting the four coils 303 to pass different values ​​of current, the direction and size of the magnetic attraction force can be controlled, and the displacement mutation of the heavy-duty magnetic levitation motor rotor 1 can be suppressed by the magnetic attraction force.

[0045] In this embodiment, the heavy-duty magnetic levitation motor rotor 1 is installed in the heavy-duty magnetic levitation motor. The overall structure of the heavy-duty magnetic levitation motor is the existing technology, which specifically includes a motor housing, in which a motor stator is installed. The heavy-duty magnetic levitation motor rotor 1 is arranged in the motor stator, and the auxiliary protection bearing 2, anti-drop magnetic bearing 3, axial magnetic bearing 4, radial magnetic bearing 5 and displacement sensor 6 are respectively arranged at corresponding positions in the motor housing.

[0046] For those skilled in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the protection scope of the present invention.

Claims

1. A heavy-duty magnetic suspension motor rotor active anti-fall system, comprising a heavy-duty magnetic suspension motor rotor (1), characterized in that: An anti-drop magnetic bearing (3) and a displacement sensor group (6) are respectively arranged near both ends of the heavy-duty magnetic levitation motor rotor (1); a signal output end of the displacement sensor group (6) is communicatively connected to a main controller; the signal output end of the main controller is electrically connected to a control end of the anti-drop magnetic bearing (3); the displacement sensor group (6) is used to detect a position signal of the heavy-duty magnetic levitation motor rotor (1) and send the position signal to the main controller in real time; and when the position of the heavy-duty magnetic levitation motor rotor (1) suddenly changes, the main controller controls the anti-drop magnetic bearing (3) to generate a magnetic levitation force for adjusting the position of the heavy-duty magnetic levitation motor rotor (1) to prevent the risk of falling.

2. The heavy-duty magnetic suspension motor rotor active anti-falling system according to claim 1 is characterized in that: The anti-drop magnetic bearing (3) comprises a magnetic conductive core (301), a central hole is provided in the middle of the magnetic conductive core (301), and four mounting portions (302) are integrally connected to the inner surface of the central hole, and the mounting portions (302) are annular and arranged at equal intervals.

3. The heavy-duty magnetic suspension motor rotor active anti-falling system according to claim 2 is characterized by: Coils (303) are respectively mounted on the mounting portion (302), and the four coils (303) are, in order from top to right, bottom to left, a first coil, a second coil, a third coil and a fourth coil.

4. The heavy-duty magnetic suspension motor rotor active anti-falling system according to claim 3 is characterized by: The signal output end of the main controller is electrically connected to four bearing drivers, which are respectively a first bearing driver, a second bearing driver, a third bearing driver and a fourth bearing driver.

5. The heavy-duty magnetic suspension motor rotor active anti-falling system according to claim 4 is characterized in that: The power output end of the first bearing driver is electrically connected to the power supply end of the first coil; the power output end of the second bearing driver is electrically connected to the power supply end of the second coil; the power output end of the third bearing driver is electrically connected to the power supply end of the third coil; the power output end of the fourth bearing driver is electrically connected to the power supply end of the fourth coil.

6. The heavy-duty magnetic suspension motor rotor active anti-falling system according to claim 5 is characterized by: The main controller sends a control signal for independently adjusting the current values ​​of the power supplies output by the corresponding first bearing driver, the second bearing driver, the third bearing driver and the fourth bearing driver; by adjusting the currents of different values ​​passed through the four coils (303), the direction and magnitude of the magnetic attraction of the anti-drop magnetic bearing (3) can be controlled.

7. The heavy-duty magnetic suspension motor rotor active anti-falling system according to claim 6 is characterized by: Each displacement sensor group (6) includes at least one displacement sensor.

8. The heavy-duty magnetic suspension motor rotor active anti-falling system according to claim 7 is characterized in that: Auxiliary protective bearings (2) are respectively sleeved on the heavy-duty magnetic suspension motor rotor (1) near both ends thereof.

9. The heavy-duty magnetic suspension motor rotor active anti-falling system according to claim 8 is characterized by: An axial magnetic bearing (4) is provided on the heavy-duty magnetic suspension motor rotor (1) near one end thereof; the axial magnetic bearing (4) generates magnetic force during operation to constrain the axial position of the heavy-duty magnetic suspension motor rotor (1).

10. The heavy-duty magnetic suspension motor rotor active anti-falling system according to claim 9 is characterized in that: Two radial magnetic bearings (5) are sleeved on the heavy-duty magnetic suspension motor rotor (1), and the two radial magnetic bearings (5) are respectively arranged at positions close to both ends of the heavy-duty magnetic suspension motor rotor (1).

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