Magnetic levitation motor system

Abstract

The application relates to the technical field of motor equipment, and provides a magnetic suspension motor system capable of improving heat dissipation effect and operation stability, which comprises a magnetic suspension motor with a shell accommodating a stator and a rotor, the surface of the shell is provided with an air inlet and an air outlet, the air inlet and the air outlet are communicated through an air cooling flow channel in the shell, a water chiller unit has a water inlet pipe and a water outlet pipe, a water cooling pipeline is arranged in the shell and is open to the water outlet pipe at one end and open to the water inlet pipe at the other end, the air inlet and the air outlet are further communicated through a backflow pipeline outside the shell, a surface cooling pipeline is arranged in a part of the wall of the backflow pipeline, the surface cooling pipeline is open to the water outlet pipe at one end and open to the water inlet pipe at the other end, and a fan is further arranged in the backflow pipeline and is configured to provide power to drive a circulating air flow formed in the backflow pipeline to flow from the air outlet to the air inlet.

Description

Technical Field

[0001] This invention relates to the field of motor equipment technology, and more specifically to a magnetic levitation motor system capable of dissipating heat from a magnetic levitation motor. Background Technology

[0002] As a mechatronic device that integrates magnetic levitation bearing technology and high-speed motor technology, the magnetic levitation high-speed motor has many internal heat sources and a relatively complex structure, thus requiring higher heat dissipation performance.

[0003] Currently, this type of motor mainly adopts the cooling methods of conventional mechanical bearing motors, using air cooling or water cooling for heat dissipation. For example, prior art document 1 discloses a coaxial cooling structure for a magnetic levitation high-speed motor, which achieves heat dissipation by setting up an air cooling module.

[0004] However, due to the characteristics of concentrated heat generation and compact structure, the heat dissipation efficiency of existing cooling methods is still insufficient, making it difficult to fully meet the heat dissipation requirements of magnetic levitation high-speed motors. This results in unsatisfactory motor temperature rise control, affecting performance and operational stability.

[0005] Prior art document 1 is a Chinese patent document with publication number CN221058118U. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a magnetic levitation motor system that can further improve the heat dissipation effect of the magnetic levitation motor and optimize its operational stability.

[0007] The overall technical solution of this invention is as follows:

[0008] This invention proposes a magnetic levitation motor system, which includes:

[0009] A magnetic levitation motor has a housing that houses the stator and rotor, and the surface of the housing is provided with an air inlet and an air outlet.

[0010] The air inlet and air outlet are connected through an air-cooling channel inside the casing;

[0011] Also includes:

[0012] A water chiller unit has an inlet pipe and an outlet pipe, and is configured to cool the liquid flowing in from the inlet pipe and discharge the cooled liquid in a directional manner from the outlet pipe.

[0013] The water-cooled pipe is located in the shell, with one end open and connected to the outlet pipe, and the other end open and connected to the inlet pipe.

[0014] Outside the casing, the air inlet and air outlet are connected by a return pipe. A cooling pipe is installed in part of the pipe wall of the return pipe. One end of the cooling pipe is connected to the water outlet pipe, and the other end is connected to the water inlet pipe.

[0015] The return duct is also equipped with a fan, which is configured to provide power to drive a rotating airflow that flows from the outlet to the inlet in the return duct.

[0016] By incorporating both air-cooled and water-cooled heat dissipation, a dual heat dissipation channel is formed, which greatly improves the heat dissipation effect of the magnetic levitation motor.

[0017] Meanwhile, a closed-loop airflow path is established through the return pipe and fan, allowing the cooling airflow to be recycled and forming a circulating cooling airflow. Moreover, the coolant driven by the chiller unit exchanges heat simultaneously inside the motor (water-cooled pipe) and in the external circulating airflow path (surface cooling pipe), realizing both direct water cooling and indirect cooling of the motor body (by cooling the circulating cooling airflow to optimize the air cooling effect on the motor), further improving the heat dissipation effect of the magnetic levitation motor and optimizing the operating stability of the magnetic levitation motor.

[0018] In some implementations, the return line includes:

[0019] Air inlet duct connected to the air inlet;

[0020] Air outlet duct connected to the air outlet;

[0021] The surface cooler has an internal surface cooling air duct that connects the air inlet pipe and the air outlet pipe.

[0022] The surface cooling air duct includes:

[0023] The first channel section that connects to the air outlet duct to allow airflow in;

[0024] The second channel section is connected to the air inlet duct to allow airflow to exit;

[0025] A docking channel section that connects the first channel section and the second channel section, wherein a surface cooling pipe is provided in the side wall of the docking channel section;

[0026] In the direction of the cyclic airflow, the diameter of the first channel gradually increases, while the diameter of the second channel gradually decreases.

[0027] A surface cooler with cooling pipes is installed to cool and dissipate heat from the rotating airflow, allowing the hot airflow discharged from the magnetic levitation motor to be recycled. Simultaneously, by designing the first channel as a gradually expanding structure and the second channel as a gradually contracting structure, the following further benefits are achieved: when the hot airflow discharged from the magnetic levitation motor enters the heat exchange zone (connection channel section), the gradually expanding structure reduces the airflow velocity and increases the static pressure, allowing the airflow to make more stable and sufficient contact with the pipe wall for heat exchange, thus creating a cool airflow; when the airflow exits after heat exchange, the gradually contracting structure increases the airflow velocity, creating a higher-speed flow of cool airflow within the magnetic levitation motor, further improving the heat dissipation efficiency and effect of the magnetic levitation motor, and optimizing the operational stability of the magnetic levitation motor.

[0028] In some implementations, the return line is also connected to a gas supply line, one end of which is connected to the return line and the other end is open.

[0029] The air supply pipeline is equipped with a one-way valve, which is configured to allow airflow in the air supply pipeline to flow into the return pipeline only from the other end of the air supply pipeline.

[0030] By adding a replenishment air pipe with a one-way valve, the system can automatically draw in cooler outside air at points where negative pressure is created in the return pipe (such as the fan inlet side) when the fan is running. This not only directly replenishes the low-temperature air to reduce the overall temperature of the circulating airflow, but also maintains and regulates the air pressure balance in the loop, further improving the system's heat dissipation efficiency and operational stability.

[0031] Furthermore, in some embodiments, one end of the air supply pipe is connected to the air outlet pipe.

[0032] The opening of the air supply pipe is specifically located on the air outlet pipe (i.e., the pipe through which the high-temperature airflow from the motor housing outlet passes). The air temperature here is relatively high, and supplying cold air here can achieve the most direct "hot and cold mixing", resulting in the most significant and efficient cooling effect; this further optimizes the effect of air supply cooling.

[0033] In some embodiments, one end of the outlet pipe and the water-cooled pipe is connected by a cold liquid pipe, which is equipped with a first flow control valve configured to control the flow rate of liquid flowing through the cold liquid pipe to the water-cooled pipe.

[0034] By incorporating a primary flow control valve, the flow rate of coolant entering the water-cooling pipes inside the motor housing can be actively and precisely adjusted. This enables dynamic, on-demand cooling control based on the motor's real-time temperature rise, ensuring both effective cooling and efficient system energy management.

[0035] In some embodiments, the outlet pipe and the cooling pipe are connected at one end via a cooling inlet pipe, which is equipped with a second flow control valve configured to control the flow rate of liquid flowing through the cooling inlet pipe into the cooling pipe.

[0036] By installing a second flow control valve on the surface cooler inlet pipe, the cooling power of the surface cooler can be adjusted independently. This allows the system to more precisely control the cooling intensity of the surface cooler based on the real-time temperature rise of the motor and the temperature of the return airflow, ensuring better cooling performance and achieving energy efficiency control of the system.

[0037] In some embodiments, the housing is hollowly formed with an installation cavity;

[0038] The rotor is housed in the mounting cavity and can rotate relative to the housing;

[0039] The stator is fixed in the mounting cavity, arranged around the rotation axis of the rotor, and surrounds the rotor;

[0040] The mounting cavity also contains several magnetic bearings that support the rotor, including:

[0041] A radial magnetic bearing that restricts the radial movement of the rotor supports the rotor in the radial direction to define a gap between the rotor and the stator that prevents them from contacting each other.

[0042] An axial magnetic bearing that restricts the axial movement of the rotor;

[0043] The rotor is constructed to not contact the housing;

[0044] The gaps between the rotor and the housing, the gaps between the rotor and the stator, and the air gaps in several magnetic bearings are all interconnected to form a common air-cooling channel.

[0045] By connecting all the gaps between the rotor and the housing, the gap between the rotor and the stator, and the air gaps of each magnetic bearing, a cooling airflow channel is formed. On the one hand, these gaps are necessary for the normal operation of magnetic levitation, eliminating the need for additional airflow channels and simplifying the overall structural layout; on the other hand, airflow passing through these gaps can directly cool the core heat-generating components (stator, rotor, and magnetic bearings), resulting in a more direct heat dissipation path and higher overall heat dissipation efficiency.

[0046] Furthermore, in some embodiments, the housing has a portion surrounding the stator, in which at least a portion of water-cooling pipes are disposed.

[0047] By combining the structural characteristics of the magnetic levitation motor, the core heat-generating component (stator) is surrounded by water cooling to provide more direct and efficient water cooling for the core heat-generating component. This forms a complementary, multi-layered cooling system with the internal air cooling channel, further improving the heat dissipation effect of the magnetic levitation motor and optimizing the operational stability of the magnetic levitation motor.

[0048] Furthermore, in some embodiments, the air inlet is located at one end of the housing and is connected to the air-cooling channel;

[0049] The air outlet is located at the other end of the casing and is connected to the air-cooling channel.

[0050] Along the rotor's axial direction, the air inlet and air outlet are located on opposite sides of the stator.

[0051] By placing the air inlet and outlet on both sides of the stator along the rotor axis, the cooling airflow is forced to flow from one end of the stator across its entire length to the other. This allows the cooling airflow to sweep more thoroughly and evenly across the entire surface of the stator, achieving more uniform heat dissipation and further improving the heat dissipation effect on the magnetic levitation motor.

[0052] Unlike radial magnetic bearings, the heat generated by axial magnetic bearings during operation is mainly concentrated in the narrow air gap between the rotor end and the bearing thrust plate. This air gap space is very limited, and the airflow path (with a part flowing radially along the rotor) is not completely consistent with the main air duct (along the rotor axis), resulting in extremely poor heat dissipation and making it easy to become a "dead zone" for heat accumulation.

[0053] Based on this, further, in some embodiments, the fan is installed in the air inlet duct of the return duct;

[0054] The mounting cavity has a portion for accommodating the axial magnetic bearing, and the sidewall of this portion is provided with a flow inlet and a flow outlet.

[0055] One end of the make-up inlet is connected to the part of the air inlet pipe located between the fan and the air inlet, and the other end is connected to the air-cooled flow channel.

[0056] One end of the make-up outlet is connected to the air gap of the axial magnetic bearing, and the other end is connected to the air outlet of the return pipeline.

[0057] By setting up a supplementary flow inlet and outlet, and utilizing the negative pressure generated by the fan installed in the air inlet duct (i.e., the suction force on the fan inlet side), a stream of air is actively diverted from the main air inlet duct and specifically guided to the chamber housing the axial magnetic bearing, forcibly flowing through the air gap of the axial magnetic bearing for more precise and efficient cooling.

[0058] In other words, by designing the pipeline and utilizing the existing negative pressure resources in the system, a forced and directional auxiliary air-cooling channel was constructed for the weak point in heat dissipation—the axial magnetic bearing. This better compensated for the "dead zone" of insufficient cooling, and achieved more balanced and effective heat dissipation for all key heat-generating areas of the motor, thereby improving the overall thermal stability and operational reliability of the system.

[0059] Furthermore, by placing the fan in the air inlet duct of the return duct, the airflow entering the fan is cold airflow that has been cooled and dissipated by the surface cooler. This can better reduce the adverse effects of high-temperature airflow on the fan (causing excessive temperature rise of the motor, unnecessary thermal expansion, uneven thermal deformation of the impeller itself, etc.), improve the long-term stability of the fan, and further enhance the overall thermal stability and operational reliability of the system.

[0060] The main beneficial effects of the above technical solution are as follows:

[0061] A combined water-cooling and air-cooling system was constructed for the magnetic levitation motor. The water cooling not only directly cools the motor, but also indirectly improves the heat dissipation capacity and efficiency of the air cooling circuit by optimizing the intake air temperature. This improves the overall heat dissipation effect of the magnetic levitation motor and optimizes its operational stability. Attached Figure Description

[0062] The present invention will now be further described with reference to the accompanying drawings.

[0063] Figure 1 This is a schematic diagram of a magnetic levitation motor.

[0064] Figure 2 This is a schematic diagram of the overall structure of a magnetic levitation motor system.

[0065] Figure 3 This is a schematic diagram of another overall structure of the magnetic levitation motor system. Detailed Implementation

[0066] The present invention will be illustrated with specific examples below.

[0067] Example:

[0068] The magnetic levitation motor system includes a magnetic levitation motor 1 and a module for cooling the magnetic levitation motor 1.

[0069] like Figure 1 As shown, the magnetic levitation motor 1 in this embodiment includes a housing 1.3, and the housing 1.3 has a hollow cavity forming a mounting cavity 1.33. The stator 1.1, the rotor 1.2, and several magnetic bearings are installed in the mounting cavity 1.33.

[0070] like Figure 1As shown, the rotor 1.2 is housed in the mounting cavity 1.33 and can rotate relative to the housing 1.3. The stator 1.1 is fixed in the mounting cavity 1.33, arranged around the rotation axis of the rotor 1.2, and surrounds the rotor 1.2.

[0071] Both the stator 1.1 and the rotor 1.2 are common structures in electric motors. For example, in this embodiment, the rotor 1.2 includes a rotatable rotor spindle 1.21 and a rotor magnet 1.22 fixedly mounted on the rotor spindle 1.21, which can be a high-strength permanent magnet (such as neodymium iron boron). The stator 1.1 can form a magnetic field coupling with the rotor magnet 1.22. After the stator 1.1 is energized, it generates an electromagnetic field to drive the rotor 1.2 to rotate, thus generating rotational power.

[0072] The rotor 1.2 is supported in the housing 1.3 by several magnetic bearings to ensure stable rotation.

[0073] like Figure 1 As shown, two radial magnetic bearings 1.4 are provided in the mounting cavity 1.33. On the axial direction of the rotor 1.2 (the direction in which the rotation axis of the rotor 1.2 extends), the two radial magnetic bearings 1.4 are respectively placed on both sides of the stator 1.1 so as to provide multi-point stable support for the rotor 1.2 in the radial direction.

[0074] For each radial magnetic bearing 1.4, it is a magnetic bearing structure commonly used in existing magnetic levitation motors to restrict the movement of rotor 1.2 in the radial direction (perpendicular to the direction of the rotation axis of rotor 1.2), such as the permanent magnet biased radial magnetic bearing disclosed in patent document CN112412980B.

[0075] The radial magnetic bearing 1.4 includes a stator module 1.41 mounted on a rotor spindle 1.21, and a rotor module 1.42 fixed in a mounting cavity 1.33. The rotor module 1.42 is arranged around the rotation axis of the rotor 1.2, and surrounds the rotor module 1.42. The stator module 1.41 and the rotor module 1.42 do not contact each other but form a magnetic field to define a gap between the rotor 1.2 and the stator 1.1, preventing them from contacting each other and preventing the rotor 1.2 from moving radially, thus achieving radial positioning of the rotor 1.2. The gap between the stator module 1.41 and the rotor module 1.42 is the air gap of the radial magnetic bearing 1.4.

[0076] like Figure 1 As shown, an axial magnetic bearing 1.5 is provided in the mounting cavity 1.33. It is a magnetic bearing structure commonly used in existing magnetic levitation motors to limit the axial movement of the rotor 1.2, such as the permanent magnet biased axial magnetic bearing disclosed in the patent document with reference to publication number CN111927885B.

[0077] The axial magnetic bearing 1.5 includes a thrust disk 1.51 fixedly sleeved on the rotor spindle 1.21, and a first stator 1.52 and a second stator 1.53 fixed in the mounting cavity 1.33. Along the axial direction of the rotor 1.2, the first stator 1.52 and the second stator 1.53 are located on opposite sides of the thrust disk 1.51. The thrust disk 1.51 does not contact the first stator 1.52 and the second stator 1.53, yet forms a magnetic field, defining gaps between the thrust disk 1.51 and the first stator 1.52, and between the thrust disk 1.51 and the second stator 1.53, thus preventing contact and preventing axial movement of the rotor 1.2, achieving axial positioning of the rotor 1.2. The intervals between the thrust disk 1.51 and the first stator 1.52, and between the thrust disk 1.51 and the second stator 1.53, constitute the air gap of the axial magnetic bearing 1.5.

[0078] In this embodiment, the rotor 1.2 is configured not to contact the housing 1.3. The gap between the rotor 1.2 and the housing 1.3, the gap between the rotor 1.2 and the stator 1.1, and the air gaps in the several magnetic bearings are all interconnected to form a cooling channel.

[0079] like Figure 2 As shown, this embodiment includes a chiller unit 2, which is a commonly used chiller structure for cooling. It provides liquid input and can cool the liquid for qualitative output, such as the industrial chiller unit disclosed in patent document CN114288732B.

[0080] The chiller unit 2 has an inlet pipe 2.1 for liquid input and an outlet pipe 2.2 for liquid output. The inlet pipe 2.1 and the outlet pipe 2.2 are connected through a flow channel inside the chiller unit 2. The chiller unit 2 is equipped with a condenser for cooling the internal flow channel and a circulation pump for driving the liquid to flow from the inlet pipe 2.1 to the outlet pipe 2.2.

[0081] like Figure 2 As shown, a water-cooled pipe 3 is embedded in the housing 1.3. One end of the water-cooled pipe 3 is a water-cooled inlet 3.1, and the other end is a water-cooled outlet 3.2.

[0082] The water-cooled inlet 3.1 is connected to the water outlet 2.2 via the coolant pipe 8, and the water-cooled outlet 3.2 is connected to the water inlet 2.1 via the return pipe 12.

[0083] The coolant pipe 8 may also be equipped with a first flow control valve 9, which is, for example, a throttle valve, and is configured to control the flow rate of the liquid flowing through the coolant pipe 8 to the water cooling pipe 3.

[0084] like Figure 2As shown, in this embodiment, the housing 1.3 has a portion that surrounds the stator 1.1, and at least a portion of the water-cooling pipe 3 is provided in this portion.

[0085] like Figure 2 As shown, the surface of the housing 1.3 is provided with an air inlet 1.31 and an air outlet 1.32. Inside the housing 1.3, the air inlet 1.31 and the air outlet 1.32 are connected by an air-cooling channel. The air-cooling channel can be formed as described above, or the air-cooling channel can be a channel provided in the side wall of the mounting cavity 1.33.

[0086] In this embodiment, the air inlet 1.31 is located at one end of the housing 1.3 and is connected to the air-cooling channel; the air outlet 1.32 is located at the other end of the housing 1.3 and is connected to the air-cooling channel; in the axial direction of the rotor 1.2, the air inlet 1.31 and the air outlet 1.32 are respectively located on both sides of the stator 1.1 and are connected through the air-cooling channel.

[0087] Outside the housing 1.3, the air inlet 1.31 and the air outlet 1.32 are also connected by a return pipe. A cooling pipe 5.31 is provided in a part of the pipe wall of the return pipe. One end of the cooling pipe 5.31 is connected to the water outlet pipe 2.2, and the other end is connected to the water inlet pipe 2.1.

[0088] Furthermore, a cooling pipe 5.31 is installed in a part of the return pipeline wall. One end of the cooling pipe 5.31 is connected to the water outlet pipe 2.2 through the cooling inlet pipe 10, and the other end is connected to the water inlet pipe 2.1 through the cooling outlet pipe 13.

[0089] A second flow control valve 11 may be provided in the surface coolant inlet pipe 10. The second flow control valve 11 is, for example, a throttle valve, and is configured to control the flow rate of liquid flowing through the surface coolant inlet pipe 10 to the surface coolant pipe 5.31.

[0090] In this embodiment, the return pipeline includes: an air inlet pipeline 5.1, an air outlet pipeline 5.2, and a surface cooler 5.3. The surface cooler 5.3 has a cavity inside which a surface cooling air duct runs through both ends.

[0091] like Figure 2 As shown, one end of the air inlet duct 5.1 is connected to the right end of the surface cooling air duct, and the other end is connected to the air inlet 1.31. One end of the air outlet duct 5.2 is connected to the left end of the surface cooling air duct, and the other end is connected to the air outlet 1.32. This allows the air inlet duct 5.1, air inlet 1.31, the air-cooled flow channel within the casing 1.3, the air outlet 1.32, the air outlet duct 5.2, and the surface cooling air duct to together form a continuous circulating air duct.

[0092] Furthermore, a fan 4 is installed in the return duct. The fan 4 is configured to provide power to drive a rotating airflow that flows from the air outlet 1.32 to the air inlet 1.31 in the return duct. This drives the airflow to circulate sequentially in the circulating air duct along: air inlet duct 5.1, air inlet 1.31, the air-cooled flow channel inside the casing 1.3, air outlet 1.32, air outlet duct 5.2, surface cooling air duct, and back to air inlet duct 5.1.

[0093] A cooling pipe 5.31 is installed in the side wall of the cooling air duct.

[0094] The fan 4 can be installed in the air inlet duct 5.1 or the air outlet duct 5.2.

[0095] like Figure 2 As shown, in this embodiment, the fan 4 is installed in the air inlet duct 5.1 of the return duct.

[0096] In this embodiment, the air inlet duct 5.1 and the air outlet duct 5.2 can be formed by a single duct or by splicing multiple ducts. The presence of a fan 4 in the duct means, for example, that a fan 4 is installed between two ducts, and the fan 4 is used to transport the airflow in one duct to the other duct.

[0097] The specific structure of the surface cooling air duct can be configured according to actual needs. In this embodiment, for example... Figure 2 As shown, the surface cooling air duct includes: a first channel section 5.32 connected to the air outlet duct 5.2 for airflow inflow; a second channel section 5.33 connected to the air inlet duct 5.1 for airflow outflow; and a docking channel section 5.34 connecting the first channel section 5.32 and the second channel section 5.33.

[0098] Furthermore, in the direction of the cyclic airflow, the channel diameter of the first channel section 5.32 gradually increases to form an expanding structure, while the channel diameter of the second channel section 5.33 gradually decreases to form a contracting structure. The channel diameter of the docking channel section 5.34 can be equal to the maximum channel diameter of the first channel section 5.32.

[0099] Cooling pipe 5.31 is provided in the side wall of the docking channel section 5.34.

[0100] like Figure 2 As shown, the return pipeline can also be connected to an additional air supply pipeline 6. One end of the air supply pipeline 6 is connected to the return pipeline, and the other end is open. Furthermore, the air supply pipeline 6 is equipped with a one-way valve 7, which only allows the airflow in the air supply pipeline 6 to flow from the other end of the air supply pipeline 6 to the return pipeline.

[0101] The air supply pipe 6 can be selectively connected to different locations in the return pipe. In this embodiment, one end of the air supply pipe 6 is connected to the air outlet pipe 5.2.

[0102] like Figure 3 As shown, the mounting cavity 1.33 has a portion for accommodating the axial magnetic bearing 1.5, and the sidewall of this portion is provided with a replenishment inlet 1.34 and a replenishment outlet 1.35.

[0103] One end of the make-up inlet 1.34 is connected to the part of the air inlet pipe 5.1 located between the fan 4 and the air inlet 1.31 through the make-up air pipe 14, and the other end is connected to the air-cooled flow channel.

[0104] One end of the replenishment outlet 1.35 is connected to the air gap of the axial magnetic bearing 1.5, and the other end is connected to the air outlet pipe 5.2 of the return pipe through the air outlet pipe 15.

[0105] When using a magnetic levitation motor system:

[0106] The magnetic levitation motor 1 is powered on to operate and generate heat.

[0107] Synchronous power-on drives the chiller unit 2 and fan 4 to start and run. At this time, fan 4 provides power to form airflow, and the main airflow circulates sequentially along: air inlet duct 5.1, air inlet 1.31, air-cooled flow channel inside casing 1.3, air outlet 1.32, air outlet duct 5.2, surface cooling air channel, and back to air inlet duct 5.1.

[0108] The secondary airflow circulates sequentially along: air inlet duct 5.1, air replenishment duct 14, air replenishment inlet 1.34, air-cooled flow channel inside casing 1.3, air replenishment outlet 1.35, air outlet duct 5.2, surface cooling air channel, and then back to air inlet duct 5.1.

[0109] The main airflow and the secondary airflow together carry away the heat from the magnetic levitation motor 1.

[0110] Furthermore, the cooling liquid (e.g., cooling water) generated by the chiller unit 2 flows sequentially along the following directions: outlet pipe 2.2, coolant pipe 8, water-cooled pipe 3, return pipe 12, and inlet pipe 2.1. This carries away the heat from the magnetic levitation motor 1 and allows the heat-exchanged liquid to return to the chiller unit 2 for cooling and reuse.

[0111] Simultaneously, the cooling liquid (e.g., cooling water) generated by the chiller unit 2 flows sequentially along: outlet pipe 2.2, surface coolant inlet pipe 10, surface coolant pipe 5.31, surface coolant outlet pipe 13, and inlet pipe 2.1. This cools the surface cooler 5.3 and allows the heat-exchanged liquid to return to the chiller unit 2 for further cooling. Through the cooling of the surface cooler 5.3, the main and secondary airflows are cooled as they pass through the surface coolant duct, before flowing back into the magnetic levitation motor 1 for repeated cooling cycles.

[0112] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Furthermore, the terms "vertical," "horizontal," "front," and "rear," etc., mentioned in the embodiments of the present invention indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be further noted that, unless otherwise explicitly specified and limited, terms such as "install," "connect," "join," and "fix" in the description should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0113] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A magnetic levitation motor system, including: A magnetic levitation motor has a housing that houses the stator and rotor, and the surface of the housing is provided with an air inlet and an air outlet. The air inlet and the air outlet are connected through an air-cooling channel inside the housing; Its characteristic is that it further includes: A water chiller unit has an inlet pipe and an outlet pipe, and is configured to: cool liquid flowing in from the inlet pipe and discharge the cooled liquid in a directional manner from the outlet pipe; A water-cooled pipe is disposed in the housing, with one end open and connected to the water outlet pipe, and the other end open and connected to the water inlet pipe. Outside the housing, the air inlet and the air outlet are also connected by a return pipe. A cooling pipe is provided in a part of the pipe wall of the return pipe. One end of the cooling pipe is connected to the water outlet pipe, and the other end is connected to the water inlet pipe. The return duct is also equipped with a fan, which is configured to provide power to drive a rotating airflow that flows from the air outlet to the air inlet in the return duct.

2. The magnetic levitation motor system according to claim 1, characterized in that: The return pipeline includes: An air inlet duct connected to the air inlet; An air outlet duct connected to the air outlet; The surface cooler has an internal surface cooling air duct that connects the air inlet pipe and the air outlet pipe. The surface cooling air duct includes: The first channel section is connected to the air outlet duct to allow airflow to flow in; A second channel section connected to the air inlet duct to allow airflow to exit; A docking channel section that connects the first channel section and the second channel section, wherein the surface cooling pipe is provided in the side wall of the docking channel section; In the direction of the cyclic airflow, the diameter of the first channel portion gradually increases, while the diameter of the second channel portion gradually decreases.

3. The magnetic levitation motor system according to claim 2, characterized in that: The return pipeline is also connected to a gas supply pipeline, one end of which is connected to the return pipeline and the other end is open. The gas supply pipe is equipped with a one-way valve, which is configured to allow the gas flow in the gas supply pipe to flow into the return pipe only from the other end of the gas supply pipe.

4. The magnetic levitation motor system according to claim 3, characterized in that: One end of the air supply pipe is connected to the air outlet pipe.

5. The magnetic levitation motor system according to claim 1, characterized in that: The outlet pipe and one end of the water cooling pipe are connected by a cold liquid pipe. A first flow control valve is installed in the cold liquid pipe, which is configured to control the flow rate of the liquid flowing through the cold liquid pipe to the water cooling pipe.

6. The magnetic levitation motor system according to claim 1, characterized in that: The outlet pipe and one end opening of the surface cooling pipe are connected by a surface cooling liquid inlet pipe. A second flow control valve is provided in the surface cooling liquid inlet pipe, which is configured to control the flow rate of the liquid flowing through the surface cooling liquid inlet pipe to the surface cooling pipe.

7. The magnetic levitation motor system according to any one of claims 1 to 6, characterized in that: The housing has a hollow cavity forming an installation cavity; The rotor is housed in the mounting cavity and is rotatable relative to the housing; The stator is fixed in the mounting cavity, arranged around the rotation axis of the rotor, and surrounds the rotor; The mounting cavity is also provided with a plurality of magnetic bearings for supporting the rotor, including: A radial magnetic bearing that restricts the radial movement of the rotor supports the rotor in the radial direction to define a gap between the rotor and the stator that prevents them from contacting each other; An axial magnetic bearing that restricts the axial movement of the rotor; The rotor is configured not to contact the housing; The gap between the rotor and the housing, the gap between the rotor and the stator, and the air gaps in the several magnetic bearings are all interconnected to form the air-cooled flow channel.

8. The magnetic levitation motor system according to claim 7, characterized in that: The housing has a portion surrounding the stator, in which at least a portion of the water-cooling pipes are disposed.

9. The magnetic levitation motor system according to claim 8, characterized in that: The air inlet is located at one end of the housing and is connected to the air-cooling channel; The air outlet is located at the other end of the housing and is connected to the air-cooling channel; Along the axial direction of the rotor, the air inlet and the air outlet are respectively located on both sides of the stator.

10. The magnetic levitation motor system according to claim 9, characterized in that: The fan is installed in the air inlet duct of the return duct; The mounting cavity has a portion for accommodating the axial magnetic bearing, and the sidewall of this portion is provided with a flow inlet and a flow outlet. One end of the supplementary flow inlet is connected to the portion of the air inlet pipe located between the fan and the air inlet, and the other end is connected to the air-cooled flow channel. One end of the replenishment outlet is connected to the air gap of the axial magnetic bearing, and the other end is connected to the air outlet of the return pipeline.

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