Passive magnetic suspension rotor

Abstract

The invention belongs to the technical field of magnetic suspension rotors, and discloses a passive magnetic suspension rotor which comprises a base, and the base is provided with a motor fixing seat, two protective bearing fixing seats and two magnetic suspension bearing fixing seats. The motor fixing seat is provided with a motor, the output end of the motor is connected with a wireless power transmission primary side assembly, the protection bearing fixing seat is provided with a protection bearing, the magnetic suspension bearing fixing seat is provided with a magnetic suspension bearing, and the axis of the protection bearing and the axis of the magnetic suspension bearing are provided with a rotating shaft together. The rotating shaft is provided with an inertia disc, the end portion of the rotating shaft is provided with a wireless power transmission secondary side assembly, the wireless power transmission secondary side assembly is located in the wireless power transmission primary side assembly, the rotating shaft is provided with an electromagnetic coil, and the position of the electromagnetic coil corresponds to the magnetic suspension bearing. And the electromagnetic coil is electrically connected with the wireless power transmission secondary side assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic suspension rotors, and in particular relates to a passive magnetic suspension rotor. Background Art

[0002] Bearings, the key components that provide support in the mechanical industry, have long been dominated by mechanical bearings with simple structures and easy adjustments. With the accelerated progress of modern industrialization, firstly, there are higher requirements for their performance. For example, bearings used in high-speed motors are required to withstand higher rotor speeds, higher operating temperatures, and extremely low friction losses, etc. These indicators have exceeded the tolerance range of traditional bearings; secondly, more application areas of bearings require them to have better flexibility. These requirements are bound to promote further research on new bearings.

[0003] The magnetic levitation rotor, also known as the magnetic bearing or electromagnetic bearing, is a high-performance bearing that uses the force of the magnetic field to suspend the rotor in space so that there is no mechanical contact between the rotor and the stator. Compared with traditional rolling bearings and sliding bearings, the magnetic levitation rotor has no mechanical contact, so the shaft can reach a very high operating speed. It has the advantages of no mechanical wear, low energy consumption, low noise, long life, no lubrication, and no pollution.

[0004] The control method of the magnetic levitation rotor based on the rotor suspension can be simply classified into two categories: active magnetic levitation rotor and passive magnetic levitation rotor. The working principle of the active magnetic levitation rotor is: an electromagnet is installed on the magnetic levitation bearing, and a permanent magnet is installed on the shaft. The magnetic force exerted by the bearing on the shaft is suction, which is a gradually unstable system. If the shaft is displaced downward during operation, the displacement sensor transmits the displacement signal to the electromagnet power supply device, adjusts the current on the electromagnet, and makes the electromagnet above the shaft produce a stronger suction force to achieve the purpose of moving the shaft back to its original position. Therefore, the active magnetic levitation rotor requires a complex control system to ensure the stability of the rotor operation.

[0005] Generally, permanent magnets are installed on magnetic bearings and rotating shafts. The bearings apply thrust to the rotating shaft. The rotor system is a self-stabilizing system, which can make the rotor work stably without applying control. However, the permanent magnets on the rotating shaft will demagnetize during use, affecting the normal operation of the rotor. Summary of the invention

[0006] In view of the problems raised by the above background technology, the purpose of the present invention is to provide a passive magnetic levitation rotor.

[0007] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0008] A passive magnetic suspension rotor comprises a base, wherein the base is provided with a motor fixing seat, two protective bearing fixing seats and two magnetic suspension bearing fixing seats;

[0009] The motor fixing seat is installed with a motor, and the output end of the motor is connected to a wireless power transmission primary side component, the protective bearing fixing seat is installed with a protective bearing, and the magnetic suspension bearing fixing seat is installed with a magnetic suspension bearing. The axis of the protective bearing and the axis of the magnetic suspension bearing are installed with a rotating shaft together, and the rotating shaft is installed with an inertia disk. A wireless power transmission secondary side component is installed at the end of the rotating shaft, and the wireless power transmission secondary side component is located inside the wireless power transmission primary side component. An electromagnetic coil is installed on the rotating shaft, and the position of the electromagnetic coil corresponds to the magnetic suspension bearing. The electromagnetic coil is electrically connected to the wireless power transmission secondary side component.

[0010] It is further defined that the wireless power transmission primary component is composed of a rectifier inverter circuit and a primary winding. The industrial frequency AC power generated by the motor is transmitted to the primary winding through the rectifier inverter circuit. In this design, the rectifier inverter circuit is responsible for converting DC power into AC power and then transmitting it to the primary winding. In this process, the energy conversion and transmission process can be optimized and energy loss can be reduced. The primary winding is a key part of energy transmission, and its design and material selection have a direct impact on the energy transmission efficiency. The optimized primary winding design can reduce resistance and inductance, and reduce energy loss during transmission. The combination of the current inverter circuit and the primary winding can form a stable energy transmission system. Through precise control strategies, the stability and quality of the output power can be ensured, thereby reducing the impact on the primary winding and the entire system. The design of the primary winding also takes into account the stability requirements of the system. Through reasonable winding and insulation design, the stability and reliability of the winding during long-term operation can be ensured, thereby improving the stability of the entire system. The combination of the rectifier inverter circuit and the primary winding makes the wireless power transmission system more flexible and convenient. The rectifier inverter circuit can adjust the frequency and amplitude of the output power as needed to adapt to different power transmission needs and scenarios. The design of the primary winding can also be customized and optimized according to different application requirements to meet the wireless power transmission needs in different scenarios.

[0011] It is further defined that the secondary side component of the wireless power transmission is composed of a complex variable winding and a current conditioning circuit, and the complex variable winding is connected to the electromagnetic coil through the current conditioning circuit. Such a design makes the conversion of current and voltage more flexible and efficient. In the wireless power transmission system, the complex variable winding can adjust the magnitude and direction of the current and voltage according to different power transmission needs and scenarios, thereby achieving more efficient energy transmission. This flexibility enables the wireless power transmission system to adapt to a wider range of application scenarios and improve the overall power transmission efficiency. The current conditioning circuit plays a key bridge role between the complex variable winding and the electromagnetic coil. It can accurately regulate and control the current output by the complex variable winding to ensure the stability and quality of the current. Through the current conditioning circuit, the clutter and interference in the current can be eliminated, the purity of the current can be improved, thereby reducing the energy loss during the transmission process. At the same time, the current conditioning circuit can also amplify or reduce the current to meet the current requirements of the electromagnetic coil and ensure the stable operation of the wireless power transmission system.

[0012] It is further defined that the magnetic bearing includes a stator and a permanent magnet connected thereto. With such a design, the magnetic bearing suspends the rotor in the magnetic field through magnetic force, and there is no mechanical contact between the rotor and the stator. This contactless support method eliminates the energy loss and wear caused by contact friction of traditional mechanical bearings, thereby extending the service life of the bearing. Since there is no physical contact between the rotor and the stator of the magnetic bearing, the friction coefficient is extremely low, almost zero, which significantly reduces the heat, wear and dust problems caused by friction, reduces maintenance costs, and improves the reliability of the equipment. The rotor of the magnetic bearing can rotate to a very high speed without causing an unstable state due to centrifugal force. At the same time, by accurately adjusting the current of the electromagnet through the control system, the size and direction of the magnetic buoyancy can be effectively controlled to keep the rotor in a stable suspension state, thereby improving the operating stability and accuracy of the equipment.

[0013] It is further specified that there is a gap between the rotating shaft and the protective bearing. With such a design, when the rotor is powered on, the protective bearing maintains a certain distance from the rotating shaft to avoid mechanical contact. When the rotor is powered off and stops working, the rotating shaft loses its suspension force, and the protective bearing then plays a supporting role in the rotating shaft.

[0014] The beneficial effects of the present invention are as follows:

[0015] The present invention avoids the mechanical connection between the rotating shaft and the motor by wireless power transmission. The electromagnetic coil generates a specific electromagnetic field, which interacts with the permanent magnet of the magnetic suspension bearing to generate a suspension force. Compared with the active magnetic suspension rotor, the present invention is a self-stabilizing system that can keep the rotor working stably without a complex control system. Compared with the general passive magnetic suspension rotor, the rotating shaft will not be demagnetized, thereby ensuring the reliability of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

[0017] Figure 1 It is a structural schematic diagram of a passive magnetic suspension rotor embodiment of the present invention;

[0018] Figure 2 A schematic diagram of the structure of a rotating shaft of an embodiment of a passive magnetic suspension rotor of the present invention;

[0019] Figure 3 A schematic cross-sectional structure diagram of the location of the wireless power transmission primary side component of a passive magnetic levitation rotor embodiment of the present invention;

[0020] The main component symbols are described as follows:

[0021] Base 1; motor fixing seat 2; protection bearing fixing seat 3; magnetic bearing fixing seat 4; motor 5; wireless power transmission primary side component 6; protection bearing 7; magnetic bearing 8; rotating shaft 9; inertia disk 10; wireless power transmission secondary side component 11; electromagnetic coil 12. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1 , Figure 2 , Figure 3 As shown, a passive magnetic suspension rotor of the present invention comprises a base 1, on which a motor fixing seat 2, two protective bearing fixing seats 3 and two magnetic suspension bearing fixing seats 4 are installed;

[0024] The motor fixing seat 2 is installed with a motor 5, and the output end of the motor 5 is connected to a wireless power transmission primary side component 6, the protective bearing fixing seat 3 is installed with a protective bearing 7, and the magnetic bearing fixing seat 4 is installed with a magnetic bearing 8. The axis of the protective bearing 7 and the axis of the magnetic bearing 8 are installed with a rotating shaft 9, and the rotating shaft 9 is installed with an inertia disk 10. A wireless power transmission secondary side component 11 is installed at the end of the rotating shaft 9. The wireless power transmission secondary side component 11 is located inside the wireless power transmission primary side component 6, and an electromagnetic coil 12 is installed on the rotating shaft 9. The position of the electromagnetic coil 12 corresponds to the magnetic bearing 8, and the electromagnetic coil 12 is electrically connected to the wireless power transmission secondary side component 11.

[0025] Preferably, the wireless power transmission primary component 6 is composed of a rectifier inverter circuit and a primary winding. The industrial frequency AC power generated by the motor 5 is transmitted to the primary winding through the rectifier inverter circuit. In this design, the rectifier inverter circuit is responsible for converting DC power into AC power and then transmitting it to the primary winding. In this process, the energy conversion and transmission process can be optimized and energy loss can be reduced. The primary winding is a key part of energy transmission, and its design and material selection have a direct impact on the energy transmission efficiency. The optimized primary winding design can reduce resistance and inductance, and reduce energy loss during transmission. The combination of the current inverter circuit and the primary winding can form a stable energy transmission system. The rectifier inverter circuit is used Accurate control strategies can ensure the stability and quality of the output power, thereby reducing the impact on the primary winding and the entire system. The design of the primary winding also takes into account the stability requirements of the system. Through reasonable winding and insulation design, the stability and reliability of the winding during long-term operation can be ensured, thereby improving the stability of the entire system. The combination of the rectifier inverter circuit and the primary winding makes the wireless power transmission system more flexible and convenient. The rectifier inverter circuit can adjust the frequency and amplitude of the output power as needed to adapt to different power transmission needs and scenarios. The design of the primary winding can also be customized and optimized according to different application requirements to meet the wireless power transmission needs in different scenarios.

[0026] Preferably, the wireless power transmission secondary component 11 is composed of a complex variable winding and a current conditioning circuit. The complex variable winding is connected to the electromagnetic coil 12 through the current conditioning circuit. Such a design makes the conversion of current and voltage more flexible and efficient. In the wireless power transmission system, the complex variable winding can adjust the magnitude and direction of the current and voltage according to different power transmission requirements and scenarios, thereby achieving more efficient energy transmission. This flexibility enables the wireless power transmission system to adapt to a wider range of application scenarios and improve the overall power transmission efficiency. The current conditioning circuit plays a key bridge role between the complex variable winding and the electromagnetic coil. It can accurately regulate and control the current output by the complex variable winding to ensure the stability and quality of the current. Through the current conditioning circuit, the clutter and interference in the current can be eliminated, the purity of the current can be improved, and thus the energy loss during the transmission process can be reduced. At the same time, the current conditioning circuit can also amplify or reduce the current to meet the current requirements of the electromagnetic coil and ensure the stable operation of the wireless power transmission system.

[0027] The magnetic bearing 8 preferably includes a stator and a permanent magnet connected thereto. With such a design, the magnetic bearing 8 suspends the rotor in the magnetic field through magnetic force, and there is no mechanical contact between the rotor and the stator. This contactless support method eliminates the energy loss and wear caused by contact friction of traditional mechanical bearings, thereby extending the service life of the bearing. Since there is no physical contact between the rotor and the stator of the magnetic bearing, the friction coefficient is extremely low, almost zero, which significantly reduces the heat, wear and dust problems caused by friction, reduces maintenance costs, and improves the reliability of the equipment. The rotor of the magnetic bearing can rotate to a very high speed without causing an unstable state due to centrifugal force. At the same time, by accurately adjusting the current of the electromagnet through the control system, the size and direction of the magnetic buoyancy can be effectively controlled to keep the rotor in a stable suspension state, thereby improving the operating stability and accuracy of the equipment.

[0028] It is preferred that there is a gap between the rotating shaft 9 and the protective bearing 7. With this design, when the rotor is powered on, the protective bearing 7 maintains a certain distance from the rotating shaft 9 to avoid mechanical contact. When the rotor stops working due to power failure, the rotating shaft 9 loses its suspension force. At this time, the protective bearing 7 plays a supporting role for the rotating shaft 9. Furthermore, the size of the gap needs to be regulated. If the distance is too close, vibration may occur during the rotation of the rotating shaft 9, which may cause mechanical contact between the rotating shaft 9 and the protective bearing 7. If the distance is large, the protective bearing 7 cannot protect the rotating shaft 9 well when it stops working. Therefore, the size of the gap between the two needs to be adjusted according to the specific situation.

[0029] In this embodiment, when a passive magnetic levitation rotor is used, the industrial frequency alternating current output by the motor 5 enters the wireless power transmission primary component 6, so that the wireless power transmission primary component 6 generates an electromagnetic field. Under the effect of the electromagnetic field, the wireless power transmission secondary component 11 located in the wireless power transmission primary component 6 generates current due to electromagnetic induction, and then outputs the working current to the electromagnetic coil 12. The electromagnetic coil 12 also generates an electromagnetic field after being energized. Under the effect of this electromagnetic field, it interacts with the magnetic field generated by the magnetic levitation bearing 8 to generate a levitation force as the kinetic energy for the suspension of the rotating shaft 9, thereby achieving the purpose of serving as a passive magnetic levitation rotor.

[0030] In summary, the suspension force of the rotating shaft 9 comes from the electromagnetic force of the electromagnetic coil 12, and no permanent magnet is installed as in the prior art, so there is no problem of permanent magnet demagnetization, thereby ensuring its service life and reliability.

[0031] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A passive magnetic suspension rotor, comprising a base (1), characterized in that: The base (1) is equipped with a motor fixing seat (2), two protective bearing fixing seats (3) and two magnetic suspension bearing fixing seats (4); The motor fixing seat (2) is installed with a motor (5), the output end of the motor (5) is connected with a wireless power transmission primary side component (6), the protective bearing fixing seat (3) is installed with a protective bearing (7), the magnetic suspension bearing fixing seat (4) is installed with a magnetic suspension bearing (8), the axis of the protective bearing (7) and the axis of the magnetic suspension bearing (8) are installed with a rotating shaft (9), the rotating shaft (9) is installed with an inertia disk (10), the end of the rotating shaft (9) is installed with a wireless power transmission secondary side component (11), the wireless power transmission secondary side component (11) is located inside the wireless power transmission primary side component (6), the rotating shaft (9) is installed with an electromagnetic coil (12), the position of the electromagnetic coil (12) corresponds to the magnetic suspension bearing (8), and the electromagnetic coil (12) is electrically connected to the wireless power transmission secondary side component (11).

2. A passive magnetic levitation rotor according to claim 1, characterized in that: The wireless power transmission primary component (6) is composed of a rectifier inverter circuit and a primary winding, and the industrial frequency alternating current generated by the motor (5) is transmitted to the primary winding via the rectifier inverter circuit.

3. A passive magnetic levitation rotor according to claim 2, characterized in that: The wireless power transmission secondary side component (11) is composed of a complex variable winding and a current conditioning circuit, and the complex variable winding is connected to the electromagnetic coil (12) via the current conditioning circuit.

4. A passive magnetic levitation rotor according to claim 3, characterized in that: The magnetic suspension bearing (8) comprises a stator and a permanent magnet connected thereto.

5. A passive magnetic levitation rotor according to claim 4, characterized in that: There is a gap between the rotating shaft (9) and the protective bearing (7).

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