A multi-stage high speed motor

Abstract

The present invention belongs to the field of motor technology, and in particular, relates to a multi-stage high-speed motor. The multi-stage high-speed motor distributes the bearing load force brought by the high speed to different bearings through a pioneering motor structure design, thereby reducing the wear condition of a single bearing. A multi-stage high-speed motor includes: a first-stage motor unit, a second-stage motor unit, a third-stage motor unit, and a high-speed motor rotating shaft; the first-stage motor unit includes a first-stage motor housing, a first-stage motor stator, a first-stage motor rotor permanent magnet core, and a first-stage motor rotor permanent magnet; the second-stage motor unit includes a second-stage motor housing, a second-stage motor stator, a second-stage motor rotor permanent magnet core, and a second-stage motor rotor permanent magnet; the third-stage motor unit includes a third-stage motor housing, a third-stage motor stator, a third-stage motor rotor permanent magnet core, and a third-stage motor rotor permanent magnet.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a multi-stage high-speed motor. Background Art

[0002] As a new type of motor equipment with a much higher speed than ordinary motors, high-speed motors are directly connected to the prime mover, eliminating the traditional reduction mechanism, so they have higher transmission efficiency and dynamic response effect. Based on this, high-speed motors have become one of the hot spots in the field of motor research, and they have broad application prospects in many technical fields such as high-speed grinders, air circulation refrigeration systems, energy storage flywheels, high-speed centrifugal compressors, blowers, aerospace, etc.

[0003] However, after further research, the inventors found that the stability of the high-speed motor bearing is the key to restricting the long-term stable operation of the high-speed motor. Among them, under the influence of high-speed motor running at high speed, the bearing has the effect of increased wear and shortened service life, which seriously restricts the normal use of the high-speed motor.

[0004] In order to overcome the above technical problems, most of the mainstream solutions in the prior art use magnetic bearings to replace traditional mechanical bearings to eliminate the friction and wear problems of traditional mechanical bearings, thereby improving the life and reliability of the bearings. However, after further research, the inventors found that the high cost and complex control method of magnetic bearings limit the specific application occasions of high-speed motors, making them difficult to popularize and requiring comprehensive consideration by technicians. Summary of the invention

[0005] The present invention provides a multi-stage high-speed motor. Through a pioneering multi-stage motor structure design, the bearing load caused by the high speed is distributed to different bearings for sharing, thereby reducing the wear of a single bearing and helping to increase the life and overall stability of the high-speed motor.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A multi-stage high-speed motor comprises: a first-stage motor unit, a second-stage motor unit, a third-stage motor unit and a high-speed motor rotating shaft;

[0008] The first-stage motor unit includes a first-stage motor housing, a first-stage motor stator, a first-stage motor rotor permanent magnet core, and a first-stage motor rotor permanent magnet;

[0009] The second-stage motor unit includes a second-stage motor housing, a second-stage motor stator, a second-stage motor rotor permanent magnet core, and a second-stage motor rotor permanent magnet;

[0010] The third-stage motor unit includes a third-stage motor housing, a third-stage motor stator, a third-stage motor rotor permanent magnet core, and a third-stage motor rotor permanent magnet;

[0011] The first-stage motor stator is fixedly mounted on the inner side of the first-stage motor housing, the first-stage motor rotor permanent magnet core and the first-stage motor rotor permanent magnet are fixedly mounted on the outer side of the second-stage motor housing in sequence; the first-stage motor housing and the second-stage motor housing are interference-fitted through the first bearing;

[0012] The second-stage motor stator is fixedly mounted on the inner side of the second-stage motor housing, and the second-stage motor rotor permanent magnet core and the second-stage motor rotor permanent magnet are fixedly mounted on the outer side of the third-stage motor housing in sequence; the second-stage motor housing and the third-stage motor housing are interference-fitted through a second bearing;

[0013] The third-stage motor stator is fixedly mounted on the inner side of the third-stage motor housing, and the third-stage motor rotor permanent magnet core and the third-stage motor rotor permanent magnet are sequentially fixedly mounted on the periphery of the high-speed motor rotating shaft; the third-stage motor housing and the high-speed motor rotating shaft are interference-fitted through a third bearing;

[0014] Also included are: a three-phase inverter for a first-stage motor unit, a three-phase inverter for a second-stage motor unit, and a three-phase inverter for a third-stage motor unit;

[0015] The three-phase inverter for the first-stage motor unit is used to generate three-phase current for driving and controlling the first-stage motor stator, the first-stage motor rotor permanent magnet core, and the first-stage motor rotor permanent magnet;

[0016] The three-phase inverter for the second-stage motor unit is used to generate three-phase current for driving and controlling the second-stage motor stator, the second-stage motor rotor permanent magnet core, and the second-stage motor rotor permanent magnet;

[0017] The three-phase inverter for the third-stage motor unit is used to generate three-phase current for driving and controlling the third-stage motor stator, the third-stage motor rotor permanent magnet core, and the third-stage motor rotor permanent magnet.

[0018] More preferably, it also includes: a wireless power transmission fixing frame; the wireless power transmission fixing frame is fixedly installed on the outer side wall of the first-stage motor housing.

[0019] More preferably, it also includes: a second-stage motor unit wireless power transmitting end component and a second-stage motor unit wireless power receiving end component adapted to each other, and a third-stage motor unit wireless power transmitting end component and a third-stage motor unit wireless power receiving end component adapted to each other;

[0020] The wireless power transmitting end assembly for the second-stage motor unit is fixedly arranged on the wireless power transmission fixed frame, and is composed of a transmitting end ring circuit for the second-stage motor unit, a transmitting end coil for the second-stage motor unit, and a transmitting end magnetic core for the second-stage motor unit, and is used to transmit the electric energy required by the second-stage motor unit;

[0021] The second-stage motor unit wireless power receiving end assembly is fixedly arranged at the outer side wall of the second-stage motor housing, and is composed of a second-stage motor unit receiving end ring circuit, a second-stage motor unit receiving end coil, and a second-stage motor unit receiving end magnetic core, and is used to receive the electric energy transmitted by the second-stage motor unit wireless power transmitting end assembly;

[0022] The wireless power transmitting end assembly for the third-level motor unit is fixedly arranged on the wireless power transmission fixed frame, and is composed of a transmitting end ring circuit for the third-level motor unit, a transmitting end coil for the third-level motor unit, and a transmitting end magnetic core for the third-level motor unit, and is used to transmit the electric energy required by the third-level motor unit;

[0023] The wireless power receiving end component for the third-level motor unit is fixedly arranged on the outer side wall of the third-level motor housing, and is composed of a receiving end ring circuit for the third-level motor unit, a receiving end coil for the third-level motor unit and a receiving end magnetic core for the third-level motor unit, and is used to receive the electric energy transmitted by the wireless power transmitting end component for the third-level motor unit.

[0024] More preferably, it also includes: a three-phase rectifier and a DC converter; wherein the three-phase rectifier and the DC converter are used to provide the DC control current required by the three-phase inverter for the first-stage motor unit, the three-phase inverter for the second-stage motor unit, and the three-phase inverter for the third-stage motor unit.

[0025] More preferably, the second-stage motor unit transmitting end ring circuit, the second-stage motor unit receiving end ring circuit, the third-stage motor unit transmitting end ring circuit, and the third-stage motor unit receiving end ring circuit are also provided with compensation networks respectively.

[0026] The present invention provides a multi-stage high-speed motor, which includes a first-stage motor unit, a second-stage motor unit, a third-stage motor unit and a high-speed motor rotating shaft. The multi-stage high-speed motor with the above structural features distributes the bearing load force brought by the high speed to different bearings through a pioneering motor structural design, thereby reducing the wear of a single bearing and providing help to improve the life and overall stability of the high-speed motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the following drawings:

[0028] Figure 1 A schematic cross-sectional structure diagram of a multi-stage high-speed motor provided by the present invention;

[0029] Figure 2 Schematic diagram of equivalent circuits of a three-phase inverter for a first-stage motor unit, a three-phase inverter for a second-stage motor unit, and a three-phase inverter for a third-stage motor unit;

[0030] Figure 3 It is a schematic diagram of an equivalent circuit of a wireless power transmitting end component for a second-stage motor unit and a wireless power transmitting end component for a third-stage motor unit;

[0031] Figure 4 It is a schematic diagram of an equivalent circuit of a wireless power receiving end component for a second-stage motor unit and a wireless power receiving end component for a third-stage motor unit;

[0032] Figure 5 It is the equivalent circuit diagram of the three-phase rectifier part;

[0033] Figure 6 is the equivalent circuit diagram of the DC converter part;

[0034] Figure 7 is the equivalent circuit diagram of the compensation network;

[0035] Figure 8 A schematic diagram of the working principle of a multi-stage high-speed motor provided by the present invention;

[0036] Fig. 9 A schematic diagram of the acceleration process of a multi-stage high-speed motor provided by the present invention;

[0037] Fig.10 A schematic diagram of the acceleration process flow of a multi-stage high-speed motor provided by the present invention.

[0038] Reference numerals:

[0039] 1. First-stage motor stator, 2. First-stage motor housing, 3. First bearing, 4. Second-stage motor stator, 5. Second-stage motor housing, 6. Second bearing, 7. Third-stage motor stator, 8. Third-stage motor housing, 9. Third bearing, 10. Third-stage motor rotor permanent magnet core, 11. Third-stage motor rotor permanent magnet, 12. Second-stage motor rotor permanent magnet core, 13. Second-stage motor rotor permanent magnet, 14. First-stage motor rotor permanent magnet core, 15. First-stage motor rotor permanent magnet, 16. Three-phase inverter for first-stage motor unit, 17. Wireless power transmission bracket, 18. Receiving end magnetic core for second-stage motor unit, 19. The second-stage motor unit uses a receiving end ring circuit, 20. The second-stage motor unit uses a receiving end coil, 21. The third-stage motor unit uses a receiving end magnetic core, 22. The third-stage motor unit uses a receiving end ring circuit, 23. The third-stage motor unit uses a receiving end coil, 24. The high-speed motor rotating shaft, 25. The third-stage motor unit uses a transmitting end ring circuit, 26. The third-stage motor unit uses a transmitting end coil, 27. The third-stage motor unit uses a transmitting end magnetic core, 28. Three-phase rectification and DC converter, 29. The second-stage motor unit uses a transmitting end ring circuit, 30. The second-stage motor unit uses a transmitting end coil, 31. The second-stage motor unit uses a transmitting end magnetic core. DETAILED DESCRIPTION

[0040] The present invention provides a multi-stage high-speed motor. Through a pioneering multi-stage motor structure design, the bearing load force brought by the high speed is distributed to different bearings for sharing, thereby reducing the wear of a single bearing and helping to increase the life and overall stability of the high-speed motor.

[0041] Specifically, Figure 1 As shown, the present invention provides a multi-stage high-speed motor, including: a first-stage motor unit, a second-stage motor unit, a third-stage motor unit and a high-speed motor rotating shaft.

[0042] Among them, the first-stage motor unit includes a first-stage motor housing 2, a first-stage motor stator 1, a first-stage motor rotor permanent magnet core 14, and a first-stage motor rotor permanent magnet 15. The second-stage motor unit includes a second-stage motor housing 5, a second-stage motor stator 4, a second-stage motor rotor permanent magnet core 12, and a second-stage motor rotor permanent magnet 13. The third-stage motor unit includes a third-stage motor housing 8, a third-stage motor stator 7, a third-stage motor rotor permanent magnet core 10, and a third-stage motor rotor permanent magnet 11.

[0043] Further, the first-stage motor stator 1 is fixedly mounted on the inner side of the first-stage motor housing 2, and the first-stage motor rotor permanent magnet core 14 and the first-stage motor rotor permanent magnet 15 are fixedly mounted on the outer side of the second-stage motor housing 5 in sequence; the first-stage motor housing 2 and the second-stage motor housing 5 are interference fit through the first bearing 3. The second-stage motor stator 4 is fixedly mounted on the inner side of the second-stage motor housing 5, and the second-stage motor rotor permanent magnet core 12 and the second-stage motor rotor permanent magnet 13 are fixedly mounted on the outer side of the third-stage motor housing 8 in sequence; the second-stage motor housing 5 and the third-stage motor housing 8 are interference fit through the second bearing 6. The third-stage motor stator 7 is fixedly mounted on the inner side of the third-stage motor housing 8, and the third-stage motor rotor permanent magnet core 10 and the third-stage motor rotor permanent magnet 11 are fixedly mounted on the periphery of the high-speed motor rotating shaft 24 in sequence; the third-stage motor housing 8 and the high-speed motor rotating shaft 24 are interference fit through the third bearing 9.

[0044] As a more preferred embodiment of the present invention, Figure 1 As shown, it also includes: a wireless power transmission fixing frame 17. Preferably, the wireless power transmission fixing frame 17 is fixedly installed on the outer side wall of the first-stage motor housing 2.

[0045] In addition, in a multi-stage high-speed motor provided by the present invention, it also includes: a three-phase inverter for the first-stage motor unit, a three-phase inverter for the second-stage motor unit, and a three-phase inverter for the third-stage motor unit. As an optional implementation, the three-phase inverter 16 for the first-stage motor unit can be set on the wireless power transmission fixing frame 17; and the three-phase inverter for the second-stage motor unit and the three-phase inverter for the third-stage motor unit can be set on the second-stage motor housing and the third-stage motor housing, respectively.

[0046] Among them, the three-phase inverter 16 for the first-stage motor unit is used to generate a three-phase current for driving and controlling the first-stage motor stator 1, the first-stage motor rotor permanent magnet core 14, and the first-stage motor rotor permanent magnet 15. The three-phase inverter for the second-stage motor unit is used to generate a three-phase current for driving and controlling the second-stage motor stator 4, the second-stage motor rotor permanent magnet core 12, and the second-stage motor rotor permanent magnet 13. The three-phase inverter for the third-stage motor unit is used to generate a three-phase current for driving and controlling the third-stage motor stator 7, the third-stage motor rotor permanent magnet core 10, and the third-stage motor rotor permanent magnet 11.

[0047] It is worth noting that the equivalent circuit diagram of the three-phase inverter for the first-stage motor unit, the three-phase inverter for the second-stage motor unit, and the three-phase inverter for the third-stage motor unit can be referred to as Figure 2Taking the three-phase inverter for the first-stage motor unit as an example, the following explanation is given: Specifically, the three-phase inverter for the first-stage motor unit is a bridge inverter circuit composed of three bridge arms; it converts direct current into three-phase alternating current, thereby driving the first-stage motor unit to rotate and work.

[0048] In addition, as a more preferred embodiment of the present invention, Figure 1 As shown, a multi-stage high-speed motor provided by the present invention also includes: a wireless power transmitting end component for a second-stage motor unit and a wireless power receiving end component for a second-stage motor unit that are adapted to each other, and a wireless power transmitting end component for a third-stage motor unit and a wireless power receiving end component for a third-stage motor unit that are adapted to each other.

[0049] Specifically, the wireless power transmitter assembly for the second-stage motor unit is fixedly arranged on the wireless power transmission fixing frame 17. It is specifically used to transmit the electric energy required by the second-stage motor unit, and is composed of a transmitter ring circuit 29 for the second-stage motor unit, a transmitter coil 30 for the second-stage motor unit, and a transmitter magnetic core 31 for the second-stage motor unit.

[0050] The second-stage motor unit wireless power receiving end assembly is fixedly arranged at the outer side wall of the second-stage motor housing 5. It is used to receive the electric energy transmitted by the second-stage motor unit wireless power transmitting end assembly, and is composed of a second-stage motor unit receiving end ring circuit 19, a second-stage motor unit receiving end coil 20 and a second-stage motor unit receiving end magnetic core 18.

[0051] The wireless power transmitter assembly for the third-level motor unit is fixedly arranged on the wireless power transmission fixing frame 17 (the equivalent circuit of the wireless power transmitter assembly for the third-level motor unit is the same as that of the wireless power transmitter assembly for the second-level motor unit). It is used to transmit the electric energy required by the third-level motor unit, and is composed of a transmitter ring circuit 25 for the third-level motor unit, a transmitter coil 26 for the third-level motor unit, and a transmitter magnetic core 27 for the third-level motor unit.

[0052] The wireless power receiving end component for the third-level motor unit is fixedly arranged on the outer side wall of the third-level motor housing 8 (the equivalent circuit of the wireless power receiving end component for the third-level motor unit is the same as that of the wireless power receiving end component for the second-level motor unit), which is specifically used to receive the electric energy transmitted by the wireless power transmitting end component for the third-level motor unit, and is composed of a receiving end ring circuit 22 for the third-level motor unit, a receiving end coil 23 for the third-level motor unit and a receiving end magnetic core 21 for the third-level motor unit.

[0053] Here, it is necessary to add that the equivalent circuits of the transmitter ring circuit for the second-stage motor unit and the transmitter ring circuit for the third-stage motor unit can be referred to as follows Figure 3 As shown, the equivalent circuits of the receiving end ring circuit for the second-stage motor unit and the receiving end ring circuit for the third-stage motor unit can be referred to as follows Figure 4 shown.

[0054] The following takes the wireless power transmitting end component for the second-stage motor unit and the wireless power receiving end component for the second-stage motor unit as an example to explain the working process of their mutual cooperation as follows:

[0055] First, the transmitting end ring circuit for the second-level motor unit is a bridge inverter composed of two bridge arms, which is specifically used to convert direct current into high-frequency alternating current; then, the transmitting end coil and the transmitting end magnetic core of the second-level motor unit process the high-frequency alternating current into a high-frequency alternating magnetic field for transmission; the receiving end coil and the receiving end magnetic core of the second-level motor unit receive the high-frequency alternating magnetic field, and the high-frequency alternating magnetic field is reprocessed into high-frequency alternating current; and the receiving end ring circuit for the second-level motor unit is a rectifier filter composed of a bridge rectifier circuit with two bridge arms and a filter capacitor, which is used to convert high-frequency alternating current into direct current. It is worth noting that in this process, the wireless transmission of the electric energy required by the second-level motor unit is realized through the mutual cooperation between the wireless power transmitting end component and the wireless power receiving end component of the second-level motor unit.

[0056] Furthermore, the receiving end ring circuit of the second motor unit outputs the DC power to the three-phase inverter of the second motor unit, and the three-phase inverter of the second motor unit converts the DC power into three-phase AC power, thereby driving the second motor unit to rotate. In addition, the working process of the third-level motor unit wireless power transmitting end component and the third-level motor unit wireless power receiving end component are similar to the working process of the second-level motor unit wireless power transmitting end component and the second-level motor unit wireless power receiving end component, and will not be described in detail here.

[0057] The present invention provides a multi-stage high-speed motor, such as Figure 1 As shown, it also includes: a three-phase rectifier and DC converter 28. The three-phase rectifier and DC converter 28 is used to provide the DC control current required by the three-phase inverter 16 for the first-stage motor unit, the three-phase inverter for the second-stage motor unit, and the three-phase inverter for the third-stage motor unit. The equivalent circuit of the three-phase rectifier part can be referred to as follows Figure 5 As shown, the equivalent circuit of the DC converter part can be referred to as Figure 6 The DC converter part is a Buck DC converter circuit composed of a switch tube, a diode, an inductor, and a capacitor, which is used to adjust the output DC voltage.

[0058] Finally, it should be noted that, preferably, compensation networks are also provided at the second-stage motor unit transmitting end ring circuit 29, the second-stage motor unit receiving end ring circuit 19, the third-stage motor unit transmitting end ring circuit 25, and the third-stage motor unit receiving end ring circuit 22. The equivalent circuit of the compensation network can be referred to as follows Figure 7 As shown. Take the compensation network on the transmitting end ring circuit side of the second-stage motor unit and the compensation network on the receiving end ring circuit side of the second-stage motor unit as examples for explanation: It is worth noting that the compensation network on the transmitting end ring circuit side of the second-stage motor unit and the compensation network on the receiving end ring circuit side of the second-stage motor unit together constitute a set of LCC-S compensation network system. Without adding an additional main control circuit, only by optimizing and adjusting the settings of each circuit element (parameter) in the compensation network, it can adapt to the severe impact on the load caused by the transmission and reception of high-frequency AC magnetic fields between the wireless power transmitting end components and the wireless power receiving end components, and significantly improve the transmission efficiency of the high-frequency AC magnetic field.

[0059] To facilitate those skilled in the art to understand the present invention, the present invention provides a multi-stage high-speed motor and its working process is explained as follows based on the following drawings:

[0060] like Figure 8 As shown, Figure 8 The schematic diagram of the working principle of the multi-stage high-speed motor provided by the present invention. First, a DC control current (voltage) is provided by a three-phase rectifier and a DC converter. The DC control current (voltage) is loaded to the three-phase inverter for the first-stage motor unit to generate a three-phase current that drives and controls the first-stage motor stator, the first-stage motor rotor permanent magnet core, and the first-stage motor rotor permanent magnet. At this time, the first-stage motor unit generates a speed n1, and at the same time, the first-stage motor rotor permanent magnet core starts to drive the second-stage motor stator to rotate.

[0061] At the same time, the DC control current (voltage) provided by the three-phase rectifier and DC converter is loaded to the wireless power transmitter component for the second-stage motor unit. Among them, the second-stage motor unit uses the transmitter ring circuit to generate a high-frequency alternating current, and flows into the second-stage motor unit transmitter coil to generate a high-frequency alternating magnetic field; correspondingly, the second-stage motor unit uses the wireless power receiver component to receive the high-frequency alternating magnetic field emitted by the second-stage motor unit wireless power transmitter component: wherein, the second-stage motor unit uses the receiver coil to generate a high-frequency alternating current after receiving the high-frequency alternating magnetic field. After the high-frequency alternating current flows into the second-stage motor unit receiver ring circuit, it generates a three-phase current for driving and controlling the second-stage motor stator, the second-stage motor rotor permanent magnet core, and the second-stage motor rotor permanent magnet. At this time, the second-stage motor unit generates a speed n1+n2, and at the same time, the second-stage motor rotor permanent magnet core begins to drive the third-stage motor stator to rotate.

[0062] At the same time, the DC control current (voltage) provided by the three-phase rectifier and DC converter is loaded to the wireless power transmitter component for the third-level motor unit. Among them, the third-level motor unit uses the transmitter ring circuit to generate a high-frequency alternating current, and flows into the third-level motor unit transmitter coil to generate a high-frequency alternating magnetic field; correspondingly, the third-level motor unit uses the wireless power receiver component to receive the high-frequency alternating magnetic field emitted by the third-level motor unit wireless power transmitter component: wherein, the third-level motor unit uses the receiver coil to generate a high-frequency alternating current after receiving the high-frequency alternating magnetic field. After the high-frequency alternating current flows into the third-level motor unit receiver ring circuit, it generates a three-phase current for driving and controlling the third-level motor stator, the third-level motor rotor permanent magnet core, and the third-level motor rotor permanent magnet. At this time, the third-level motor unit generates a speed n1+n2+n3, and at the same time, the third-level motor rotor permanent magnet core begins to drive the high-speed motor rotating shaft to rotate.

[0063] Thus, the present invention provides a multi-stage high-speed motor, which distributes the bearing load force brought by the high speed to different bearings for sharing, thereby reducing the wear condition of a single bearing.

[0064] On the other hand, the acceleration and deceleration process of a multi-stage high-speed motor provided by the present invention is supplemented as follows:

[0065] When a multi-stage high-speed motor continues to increase its speed n based on the initial speed n0, so that the final speed is n0+n. First, we can calculate (n0+n) / 3 to get an integer n a And remainder b. When b is 0, the speed of the first-level motor unit to the third-level motor unit is set to n a ; When b is 1, the speed of the first-stage motor unit and the second-stage motor unit are set to n a , the speed of the third-stage motor unit is n a +1; when b is 2, the speed of the first-level motor unit is set to n a The speeds of the second-stage motor unit and the third-stage motor unit are both n a +1, please refer to Fig. 9 shown.

[0066] The deceleration process can be referred to as: when a multi-stage high-speed motor continues to reduce the speed n based on the initial speed n0, so that the final speed is n0-n. First, calculate (n0-n) / 3 to get an integer n a And remainder b. When b is 0, the speed of the first-level motor unit to the third-level motor unit is set to n a ; When b is 1, the speed of the first-stage motor unit and the second-stage motor unit are set to n a , the speed of the third-stage motor unit is na +1; when b is 2, the speed of the first-level motor unit is set to n a The speeds of the second-stage motor unit and the third-stage motor unit are both n a +1, please refer to Fig.10 shown.

[0067] The present invention provides a multi-stage high-speed motor, which includes a first-stage motor unit, a second-stage motor unit, a third-stage motor unit and a high-speed motor rotating shaft. The multi-stage high-speed motor with the above structural features distributes the bearing load force brought by the high speed to different bearings through a pioneering motor structural design, thereby reducing the wear of a single bearing and providing help to improve the life and overall stability of the high-speed motor.

[0068] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-stage high-speed motor, characterized in that: It includes: a first-stage motor unit, a second-stage motor unit, a third-stage motor unit and a high-speed motor rotating shaft; The first-stage motor unit includes a first-stage motor housing, a first-stage motor stator, a first-stage motor rotor permanent magnet core, and a first-stage motor rotor permanent magnet; The second-stage motor unit includes a second-stage motor housing, a second-stage motor stator, a second-stage motor rotor permanent magnet core, and a second-stage motor rotor permanent magnet; The third-stage motor unit includes a third-stage motor housing, a third-stage motor stator, a third-stage motor rotor permanent magnet core, and a third-stage motor rotor permanent magnet; The first-stage motor stator is fixedly mounted on the inner side of the first-stage motor housing, the first-stage motor rotor permanent magnet core and the first-stage motor rotor permanent magnet are fixedly mounted on the outer side of the second-stage motor housing in sequence; the first-stage motor housing and the second-stage motor housing are interference-fitted through the first bearing; The second-stage motor stator is fixedly mounted on the inner side of the second-stage motor housing, and the second-stage motor rotor permanent magnet core and the second-stage motor rotor permanent magnet are fixedly mounted on the outer side of the third-stage motor housing in sequence; the second-stage motor housing and the third-stage motor housing are interference-fitted through a second bearing; The third-stage motor stator is fixedly mounted on the inner side of the third-stage motor housing, and the third-stage motor rotor permanent magnet core and the third-stage motor rotor permanent magnet are sequentially fixedly mounted on the periphery of the high-speed motor rotating shaft; the third-stage motor housing and the high-speed motor rotating shaft are interference-fitted through a third bearing; Also included are: a three-phase inverter for a first-stage motor unit, a three-phase inverter for a second-stage motor unit, and a three-phase inverter for a third-stage motor unit; The three-phase inverter for the first-stage motor unit is used to generate three-phase current for driving and controlling the first-stage motor stator, the first-stage motor rotor permanent magnet core, and the first-stage motor rotor permanent magnet; The three-phase inverter for the second-stage motor unit is used to generate three-phase current for driving and controlling the second-stage motor stator, the second-stage motor rotor permanent magnet core, and the second-stage motor rotor permanent magnet; The three-phase inverter for the third-stage motor unit is used to generate three-phase current for driving and controlling the third-stage motor stator, the third-stage motor rotor permanent magnet core, and the third-stage motor rotor permanent magnet.

2. A multi-stage high speed motor according to claim 1, characterized in that: It also includes: a wireless power transmission fixing frame; the wireless power transmission fixing frame is fixedly installed on the outer side wall of the first-stage motor housing.

3. A multi-stage high speed motor according to claim 2, characterized in that: Also included are: a second-stage motor unit wireless power transmitting end component and a second-stage motor unit wireless power receiving end component adapted to each other, and a third-stage motor unit wireless power transmitting end component and a third-stage motor unit wireless power receiving end component adapted to each other; The wireless power transmitting end assembly for the second-stage motor unit is fixedly arranged on the wireless power transmission fixed frame, and is composed of a transmitting end ring circuit for the second-stage motor unit, a transmitting end coil for the second-stage motor unit, and a transmitting end magnetic core for the second-stage motor unit, and is used to transmit the electric energy required by the second-stage motor unit; The second-stage motor unit wireless power receiving end assembly is fixedly arranged at the outer side wall of the second-stage motor housing, and is composed of a second-stage motor unit receiving end ring circuit, a second-stage motor unit receiving end coil, and a second-stage motor unit receiving end magnetic core, and is used to receive the electric energy transmitted by the second-stage motor unit wireless power transmitting end assembly; The wireless power transmitting end assembly for the third-level motor unit is fixedly arranged on the wireless power transmission fixed frame, and is composed of a transmitting end ring circuit for the third-level motor unit, a transmitting end coil for the third-level motor unit, and a transmitting end magnetic core for the third-level motor unit, and is used to transmit the electric energy required by the third-level motor unit; The wireless power receiving end component for the third-level motor unit is fixedly arranged on the outer side wall of the third-level motor housing, and is composed of a receiving end ring circuit for the third-level motor unit, a receiving end coil for the third-level motor unit and a receiving end magnetic core for the third-level motor unit, and is used to receive the electric energy transmitted by the wireless power transmitting end component for the third-level motor unit.

4. The multi-stage high-speed motor according to claim 1, characterized in that: It also includes: a three-phase rectifier and a DC converter; wherein the three-phase rectifier and the DC converter are used to provide the DC control current required by the three-phase inverter for the first-stage motor unit, the three-phase inverter for the second-stage motor unit, and the three-phase inverter for the third-stage motor unit.

5. The multi-stage high-speed motor according to claim 3, characterized in that: It also includes: a transmitting end ring circuit for the second-stage motor unit, a receiving end ring circuit for the second-stage motor unit, a transmitting end ring circuit for the third-stage motor unit, and a receiving end ring circuit for the third-stage motor unit, and compensation networks are also respectively arranged.

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