Roller screw electromagnetic suspension with liquid cooling function

Abstract

The invention discloses a roller lead screw electromagnetic suspension with a liquid cooling function. The roller lead screw electromagnetic suspension comprises a reverse roller lead screw transmission device, a frameless motor driving device, a frameless motor coil liquid cooling heat dissipation device, an encoder, a lifting lug, an end cover, a nut connecting piece, an angular contact ball bearing, an axial retainer and a shell. The reverse roller lead screw transmission device comprises a nut rotor, a guide ring, a threaded roller and a lead screw. The frameless motor comprises a stator core, a coil and a rotor. The frameless motor coil liquid cooling heat dissipation device comprises a magnetic gear, a two-way single-action vane pump, a pump shaft, a pump shaft connecting piece, a cooling liquid pipeline and a cooling liquid cavity. The electromagnetic suspension has the beneficial effects that the frameless motor is integrated to the electromagnetic suspension, so that the internal mounting space is reduced; accurate control over the flow speed of the cooling liquid is achieved, and overload protection is achieved for the liquid cooling heat dissipation device. The problems that an electromagnetic suspension driving frameless motor coil is difficult in heat dissipation and large in power loss, and the efficiency of a frameless motor is low are solved.

Description

Technical Field

[0001] The invention relates to the field of electromagnetic suspension, and in particular to a roller screw electromagnetic suspension with a liquid cooling function. Background Art

[0002] In the field of modern automotive engineering, electromagnetic suspension systems are increasingly used, and the frameless motors that drive them play a core role in the operation of the system. As vehicle performance requirements continue to increase, the working intensity and load of the frameless motors that drive electromagnetic suspensions also increase accordingly.

[0003] During the operation of the electromagnetic suspension, the frameless motor operates frequently to adjust parameters such as the stiffness and damping of the suspension, which causes the frameless motor coil to generate a large amount of heat. When the electromagnetic suspension needs to respond quickly to suppress vibration during vehicle driving, if the heat cannot be dissipated in time and effectively, the temperature of the frameless motor coil will rise sharply, reducing the output torque of the frameless motor and making it unable to respond in time, affecting the adjustment ability of the electromagnetic suspension, and reducing the vehicle's handling performance and driving comfort; the high temperature of the frameless motor coil driven by the electromagnetic suspension will also significantly increase the power loss of the frameless motor and reduce the efficiency of the frameless motor. Severe high temperature may even cause insulation breakdown, resulting in a short circuit failure of the frameless motor, causing the electromagnetic suspension system to fail, and directly affecting the vehicle's driving stability and safety.

[0004] Traditional heat dissipation methods have many limitations when dealing with the heat dissipation requirements of electromagnetic suspension-driven frameless motors. The natural air cooling method is limited by the low heat transfer coefficient of air, and the heat dissipation efficiency is difficult to meet the requirements, especially when the frameless motor is running at high load or the vehicle is in a high temperature environment. It is impossible to effectively reduce the temperature of the frameless motor coil. Some simple liquid cooling devices have deficiencies in the accuracy of coolant flow control and compatibility with the working state of the electromagnetic suspension. They cannot be intelligently adjusted according to the actual heating conditions of the frameless motor and the dynamic operation requirements of the suspension, resulting in unsatisfactory heat dissipation effects and difficulty in ensuring the stable and reliable operation of the frameless motor.

[0005] Therefore, how to design an efficient liquid cooling device for the drive frameless motor coil that is adapted to the working characteristics of the electromagnetic suspension is also one of the key issues that need to be solved in the current field of vehicle engineering technology. In view of the above problems, a solution is proposed below. Summary of the invention

[0006] The purpose of the present invention is to provide a roller screw electromagnetic suspension with liquid cooling function, which solves the problem of heat dissipation difficulty of the frameless motor coil driven by the electromagnetic suspension, ensures that the frameless motor runs at a suitable temperature, improves the reliability and service life of the frameless motor, and thus ensures the stable operation of the entire electromagnetic suspension system.

[0007] The above technical object of the present invention is achieved by the following technical solutions: A roller screw electromagnetic suspension with liquid cooling function, comprising a housing, a reverse roller screw drive device, a frameless motor drive device and a frameless motor coil liquid cooling and heat dissipation device, characterized in that Upper end covers and lower end covers are respectively arranged at both ends of the housing, and a lifting lug is fixedly arranged on one side of the upper end cover; The reverse roller screw drive device includes a nut rotor, a guide ring, thread rollers and a lead screw; the nut rotor is fixed inside the housing through angular contact ball bearings; the lead screw is inserted into the nut rotor, the thread rollers are sleeved at the end of the lead screw, and the thread rollers are threadedly connected with the nut rotor; the guide ring is fixed on the lead screw, and the guide ring is located at one end of the thread rollers; The frameless motor includes four frameless motors, the outer edges of the frameless motors are fixedly connected with the housing, a plurality of axial cages are arranged inside the housing, the four frameless motors are fixed inside the housing through the axial cages, and the inner edges of the frameless motors are fixedly connected with the outer edges of the nut rotor to drive the nut rotor to rotate; The frameless motor coil liquid cooling and heat dissipation device includes a magnetic gear, a double-acting single-action vane pump, a coolant chamber and a coolant pipe. The magnetic gear is located inside the housing, and the double-acting single-action vane pump is fixedly connected with the magnetic gear; the magnetic gear is fixedly connected with one side of the nut rotor through a nut connector; The coolant chamber is arranged inside the housing, one end of the coolant pipe is communicated with the coolant chamber, the other end of the coolant pipe is connected with the double-acting single-action vane pump, and the double-acting single-action vane pump sucks out the coolant in the coolant chamber through the coolant pipe, so that the coolant circulates through the coolant pipe to realize the cooling of the frameless motor.

[0008] Preferably, the frameless motor includes a stator core, a coil and a permanent magnet sheet; the permanent magnet sheet is sleeved and fixed on the outside of the nut rotor; the coil is sleeved outside the permanent magnet sheet through an axial cage and has a gap with the permanent magnet sheet; the stator core is fixed on the inner side of the housing, and the stator core is sleeved outside the coil.

[0009] Preferably, the magnetic gear includes a permanent magnet stator, a modulation ring rotor and a permanent magnet rotor. The permanent magnet stator is fixedly connected with the housing, the modulation ring rotor is connected with the double-acting single-action vane pump through a pump shaft connector, and the permanent magnet rotor is fixedly connected with the nut rotor through a nut connector.

[0010] Preferably, the double-acting single-action vane pump includes a vane pump housing, vane pump vanes, a vane pump rotor, a pump shaft, an oil inlet and an oil outlet, and the vane pump housing is embedded on one side of the upper end cover; The pump shaft, vane pump rotor, and vane pump vanes are all located inside the vane pump housing. The pump shaft is fixed at the central position of the vane pump housing. The pump shaft connector is fixed on one side of the pump shaft and is fixedly connected to the pump shaft. A number of the vane pump vanes are arranged around the pump shaft and are fixedly connected to the pump shaft. The vane pump rotor is fixedly connected to the pump shaft and rotates synchronously with the pump shaft. The inlet and outlet are both arranged on the vane pump housing and are respectively connected to one end of the coolant pipeline.

[0011] Preferably, an encoder is further connected to the end of the lead screw. The encoder is used to pick up the motion information of the lead screw to achieve precise control of the working state of the electromagnetic suspension.

[0012] The working principle of a roller screw electromagnetic suspension with liquid cooling function includes the following steps: Step 1, the frameless motor strong magnetic sheet drives the reverse type ball screw nut to rotate, realizing the conversion of the motor output speed into the speed of the nut rotor. The magnetic gear permanent magnet rotor is connected to the nut rotor through the nut connector. The nut connector transmits the speed of the nut rotor to the permanent magnet rotor, and adjusts the transmission ratio by changing the effective number of pole pairs of the two components of the modulation ring rotor and the permanent magnet rotor. Step 2, the magnetic gear modulation ring rotor is connected to the vane pump pump shaft through the pump shaft connector, realizing the speed conversion between the modulation ring rotor and the vane pump pump shaft. The oil in the coolant chamber built in the electromagnetic suspension housing works together with the vane pump through the coolant pipeline, and the circulating flow of the oil realizes the liquid cooling and heat dissipation function of the motor coil for the vibration of the electromagnetic suspension.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention applies a frameless motor coil liquid cooling and heat dissipation device and a frameless motor integration, which are reasonably arranged inside the electromagnetic suspension, reducing the internal installation space and improving the structural compactness of the entire electromagnetic suspension.

[0014] 2. The present invention applies the cooperation of a magnetic gear and a bi-directional single-acting vane pump to achieve overload protection for the liquid cooling and heat dissipation device, avoiding problems such as large power loss and low efficiency of the frameless motor, and improving the reliability and service life of the frameless motor. Description of the Drawings

[0015] Figure 1 It is a structural schematic diagram of the embodiment; Figure 2 It is a layout schematic diagram of the magnetic gear of the embodiment; Figure 3 It is a layout schematic diagram of the bi-directional single-acting vane pump of the embodiment; Figure 4 It is a schematic diagram of the working principle of the frameless motor coil liquid cooling and heat dissipation device of the embodiment.

[0016] Reference numerals: 1, lifting lug; 2, upper end cover; 3, housing; 4, coolant cavity; 5, angular contact ball bearing; 6, axial cage; 7, stator core; 8, coil; 9, strong magnetic sheet; 10, nut rotor; 11, lower end cover; 12, lead screw; 13, guide ring; 14, thread roller; 15, permanent magnet stator; 16, pump shaft connector; 17, modulation ring rotor; 18, permanent magnet rotor; 19, nut connector; 20, encoder; 21, vane pump; 22, pump shaft; 23, oil inlet; 24, vane pump vane; 25, vane pump rotor; 26, oil outlet; 27, coolant pipe; 28, vane pump housing. Detailed implementation manners

[0017] The following description is only the preferred implementation manner of the present invention, and the protection scope is not limited to this embodiment. All technical solutions falling within the idea of the present invention shall fall within the protection scope of the present invention.

[0018] As Figures 1 to 4 shown, a roller screw electromagnetic suspension with liquid cooling function includes a housing 3, a reverse roller screw transmission device, a frameless motor drive device, and a frameless motor coil liquid cooling and heat dissipation device.

[0019] Upper end cover 2 and lower end cover 11 are respectively arranged at both ends of housing 3, and a lifting lug 1 is also arranged on the outer side of upper end cover 2. The reverse roller screw transmission device, the frameless motor drive device, and the frameless motor coil liquid cooling and heat dissipation device are all arranged in housing 3.

[0020] The reverse roller screw transmission device includes a nut rotor 10, a guide ring 13, a thread roller 14, and a lead screw 12; both the housing 3 and the nut rotor 10 are cylindrical. The nut rotor 10 is located in the middle of the inner cavity of the housing 3 and is fixed by a plurality of angular contact ball bearings 5 arranged in the inner cavity of the housing 3, so that the nut rotor 10 can rotate freely with respect to the housing 3. The nut rotor 10 in this application refers to the rotor of the frameless torque.

[0021] The main body of the lead screw 12 is inserted into the nut rotor 10. The front end of the lead screw 12 penetrates through the lower end cover 11 and is in sliding fit with the lower end cover 11. The end of the lead screw 12 is connected to the nut rotor 10 through a nut connector 19. An encoder 20 is also arranged in the nut connector 19. The encoder 20 is sleeved on the end of the lead screw 12. The encoder 20 is used to pick up the motion information of the lead screw 12. Based on the collected data, the rotation speed of the frameless motor is dynamically adjusted, so as to effectively control the rotation speed of the nut 10 and achieve precise control of the working state of the electromagnetic suspension.

[0022] The threaded roller 14 is sleeved on the end of the lead screw 12, and the threaded roller 14 is threadedly connected to the nut rotor 10; the guide ring 13 is sleeved on the position of the lead screw near the end and is located on the front side of the threaded roller 14. The rotation of the nut rotor 10 drives the threaded roller 14 to rotate stably between the lead screw 12 and the nut 10.

[0023] The frameless motor includes four frameless motors, and each frameless motor includes a stator core 7, a coil 8 and a permanent magnet sheet 9; the permanent magnet sheet 9 is sleeved and fixed on the outside of the nut rotor 10, the coil 8 is sleeved on the outside of the permanent magnet sheet 9 through an axial cage 6 and has a gap with the permanent magnet sheet 9, and the stator core 7 is fixed inside the housing 3 and the stator core 7 is sleeved on the outside of the coil 8.

[0024] When the coil 8 of the frameless motor is energized, the magnetic field generated by the stator core 7 acts on the permanent magnet sheet 9, causing the permanent magnet sheet 9 to generate a rotational motion, and then driving the nut rotor 10 connected to the permanent magnet sheet 9 to perform a rotational motion. The axial cage 6 realizes the restriction of the axial movement of the frameless motor, and arranges the four frameless motors in the housing 3 in an integrated manner reasonably, improving the compactness of the entire electromagnetic suspension structure.

[0025] During the vehicle driving process, the electromagnetic suspension absorbs the vibration transmitted from the vehicle frame and the vehicle body, and transmits the linear motion of the vibration to the reverse roller lead screw 12.

[0026] The encoder 20, as the sensitive sensing unit of the entire electromagnetic suspension, can pick up the vibration speed information of the lead screw 12 extremely accurately. In this process, the conversion module inside the encoder 20 efficiently converts the obtained physical signals into electrical signals and immediately feeds them back to the frameless motor.

[0027] After receiving the feedback signal, the frameless motor control system quickly and accurately adjusts the input voltage or current of the frameless motor to achieve precise control of the operating state of the frameless motor. The permanent magnet sheet 9 starts to rotate under the drive of the changing voltage or current, and then drives the nut rotor 10 to perform a rotational motion.

[0028] In the reverse roller lead screw transmission device, the rotation of the nut rotor 10 drives the threaded roller 14 to rotate stably between the lead screw 12 and the nut 10. At the same time, the guide ring 13 accurately guides the axial movement of the threaded roller 14 by virtue of its positioning function. Through this coordinated cooperation, the rotational motion of the nut 10 is smoothly converted into the linear motion of the lead screw 12, thereby effectively canceling or adjusting the vibration generated by the electromagnetic suspension due to external interference or changes in the vehicle driving state, and achieving precise and efficient control of the vibration of the electromagnetic suspension.

[0029] The liquid cooling and heat dissipation device for the frameless motor coil includes a magnetic gear, a bi-directional single-acting vane pump 21, a coolant chamber and a coolant pipe 27.

[0030] The magnetic gear is located inside the housing. The magnetic gear includes a permanent magnet stator 15, a modulation ring rotor 17, and a permanent magnet rotor 18. The permanent magnet stator 15 is fixedly connected to the outer housing 3.

[0031] The permanent magnet rotor 18 of the magnetic gear is tightly connected to the nut 10 through a nut connector 19. When the nut 10 rotates driven by the frameless motor, the nut connector 19 can accurately transfer the rotational speed of the nut 10 to the permanent magnet rotor 18. Based on the magnetic field modulation principle of the magnetic gear, by changing the effective number of pole pairs of the two components, the modulation ring rotor 17 and the permanent magnet rotor 18, the precise adjustment of the transmission ratio can be flexibly achieved.

[0032] The modulation ring rotor 17 is fixedly connected to the bi-directional single-acting vane pump 21 through a pump shaft connector 16. When the transmission ratio changes, this connection relationship can effectively transfer the change to the bi-directional single-acting vane pump 21.

[0033] The bi-directional single-acting vane pump 21 includes a vane pump housing 28, vane pump vanes 24, a vane pump rotor 25, a pump shaft 22, an oil inlet 23, and an oil outlet 26. The vane pump housing 28 is embedded on one side of the upper end cover 2. The pump shaft 22, the vane pump rotor 25, and the vane pump vanes 24 are all located inside the vane pump housing 28. The pump shaft 22 is fixed at the central position of the vane pump housing 28. The pump shaft connector 16 is fixed on one side of the pump shaft 22 and is fixedly connected to the pump shaft 22. A number of vane pump vanes 24 are arranged around the pump shaft 22 and are fixedly connected to the pump shaft 22. The vane pump rotor 25 is fixedly connected to the pump shaft 22. The oil inlet 23 and the oil outlet 26 are both arranged on the vane pump housing 28 and are respectively connected to one end of the coolant pipe 27.

[0034] The vane pump rotor 25 will rotate synchronously with the rotation of the pump shaft 22. When the vane pump rotor 25 rotates continuously and steadily, the volume of the sealed chamber formed among the vane pump rotor 25, the vane pump vanes 24, the vane pump housing 28, and the pump shaft 22 will change according to a certain cycle.

[0035] In this dynamic process, the coolant in the coolant chamber built in the housing 3 is sucked into the sealed chamber through the oil inlet 23 under the action of the pressure difference. On the side of the oil outlet 26, as the vane pump rotor 25 rotates, the volume of the sealed chamber gradually decreases, the oil in the chamber is squeezed, and the pressure continuously rises. The high-pressure oil is discharged through the oil outlet 26.

[0036] The coolant forms a stable circulating flow in the whole system. By using the coolant circulation to take away the heat generated by the coil 8 during operation, the liquid cooling and heat dissipation function of the frameless motor coil for electromagnetic suspension vibration is realized, ensuring the stable operation of the frameless motor all the time and guaranteeing the high performance and reliability of the whole electromagnetic suspension system.

[0037] A control method for the circulating flow of the coolant in the frameless motor coil of a reverse roller screw electromagnetic suspension.

[0038] The control method includes the following steps: H1: The permanent magnet stator of the magnetic gear is fixedly connected to the electromagnetic suspension, providing a relatively stable magnetic field environment. The permanent magnet rotor and the modulation ring rotor are in the magnetic field, and their own magnetic poles interact with the external magnetic field. The magnetic field of the inner permanent magnet rotor is generated by the distribution of its permanent magnet poles; the modulation ring rotor is made of soft magnetic material and can modulate the magnetic field; When the permanent magnet rotor rotates, the direction and intensity of the magnetic field change with the rotation angle of the permanent magnet rotor. The changing magnetic field will cause a change in magnetic flux in the modulation ring rotor, and the change in magnetic flux will induce an electromotive force in the modulation ring rotor; the modulation ring rotor is conductive, and the induced electromotive force generates an induced current in the modulation ring rotor. The induced current generates a magnetic field, which interacts with the magnetic field of the permanent magnet rotor. The induced magnetic field hinders the change of the magnetic field of the inner permanent magnet rotor. The interaction will generate a torque on the inner permanent magnet rotor and also cause a reaction torque on the modulation ring rotor; The relationship between the rotational speed of the permanent magnet rotor and the rotational speed of the modulation ring rotor satisfies , where is the rotational speed of the permanent magnet rotor, is the rotational speed of the modulation ring rotor, is the number of pole pairs of the permanent magnet rotor, is the number of pole pairs of the modulation ring rotor. The modulation ring rotor is connected to the pump shaft connector, and the permanent magnet rotor is connected to the nut rotor through a nut connector. From the relational formula, the rotational speed of the pump shaft is obtained, realizing the conversion of the rotational speed from the rotation of the strong magnetic sheet of the frameless motor to the rotation of the pump shaft.

[0039] H2: The rotor of the double-acting single-vane pump rotates synchronously with the pump shaft. A sealed chamber is formed between the rotor of the double-acting single-vane pump, the blades of the double-acting single-vane pump, the housing of the double-acting single-vane pump, and the pump shaft; the coolant in the coolant chamber inside the housing is sucked into the sealed chamber through the oil inlet under the action of the pressure difference. On the side of the oil outlet, as the rotor of the double-acting single-vane pump rotates, the volume of the sealed chamber decreases, and the oil in the chamber is squeezed, and the pressure continuously increases. Then, the high-pressure oil is discharged through the oil outlet, and the coolant circulates stably in the entire system; The relational formula between the flow rate of the double-acting single-vane pump and the rotor of the double-acting single-vane pump is , where is the theoretical flow rate of the double-acting single-vane pump, is the oil discharge per revolution (depending on the geometric structure of the double-acting single-vane pump, including the curve shape of the permanent magnet stator, the size of the rotor of the double-acting single-vane pump, the length and thickness of the blades of the double-acting single-vane pump), is the rotational speed of the rotor of the double-acting single-vane pump (i.e., the rotational speed of the modulation ring rotor). The relational formula between the flow rate and the oil flow velocity is , where is the oil flow velocity, is the cross-sectional area of the pipeline. Through the above relationship, the conversion from the rotational speed of the modulation ring rotor to the oil flow velocity is achieved, the coolant circulation is realized, and the liquid cooling function of the frameless motor coil for electromagnetic suspension vibration is realized.

[0040] In the specific embodiments described above, the technical problems solved, the technical solutions and the beneficial effects of the present invention are further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A roller screw electromagnetic suspension with liquid cooling function, comprising a housing (3), a reverse roller screw (12) transmission device, a frameless motor drive device and a frameless motor coil liquid cooling device, characterized in that: An upper end cover (2) and a lower end cover (11) are respectively provided at both ends of the housing (3), and a lifting ear (1) is fixedly provided on one side of the upper end cover (2); The reverse roller screw (12) transmission device comprises a nut rotor (10), a guide ring (13), a threaded roller (14) and a screw (12); the nut rotor (10) is fixed inside the housing (3) via an angular contact ball bearing (5); the screw (12) is inserted into the nut rotor (10), the threaded roller (14) is sleeved on the end of the screw (12), and the threaded roller (14) is threadedly connected to the nut rotor (10); the guide ring (13) is fixed on the screw (12), and the guide ring (13) is located at one end of the threaded roller (14); The frameless motor driving device comprises four frameless motors, the outer edges of the frameless motors are fixedly connected to a housing (3), a plurality of axial retaining frames (6) are arranged in the housing (3), the four frameless motors are fixed in the housing (3) via the axial retaining frames (6), and the inner edges of the frameless motors are fixedly connected to the outer edge of a nut rotor (10) to drive the nut rotor (10) to rotate; The frameless motor coil liquid cooling device comprises a magnetic gear, a bidirectional single-acting vane pump (21), a coolant chamber and a coolant pipeline (27); the magnetic gear is located in a housing; the bidirectional single-acting vane pump (21) is fixedly connected to the magnetic gear; the magnetic gear is fixedly connected to one side of a nut rotor (10) via a nut connector (19); The coolant chamber is disposed in the housing (3); one end of the coolant pipe (27) is in communication with the coolant chamber; the other end of the coolant pipe (27) is connected to a bidirectional single-acting vane pump (21); the bidirectional single-acting vane pump (21) sucks the coolant out of the coolant chamber through the coolant pipe (27), so that the coolant circulates through the coolant pipe (27) to achieve cooling of the frameless motor.

2. The roller screw electromagnetic suspension with liquid cooling function according to claim 1, characterized in that: The frameless motor comprises a stator core (7), a coil (8) and a strong magnetic sheet (9); the strong magnetic sheet (9) is sleeved and fixed on the outside of a nut rotor (10); the coil (8) is sleeved on the outside of the strong magnetic sheet (9) through an axial retaining frame (6), and a gap is formed between the coil (8) and the strong magnetic sheet (9); the stator core (7) is fixed on the inside of a housing (3), and the stator core (7) is sleeved on the outside of the coil (8).

3. The roller screw electromagnetic suspension with liquid cooling function according to claim 1, characterized in that: The magnetic gear comprises a permanent magnet stator (15), a modulation ring rotor (17) and a permanent magnet rotor (18); the permanent magnet stator (15) is fixedly connected to a housing (3); the modulation ring rotor (17) is connected to a bidirectional single-acting vane pump (21) via a pump shaft connector (16); and the permanent magnet rotor (18) is fixedly connected to a nut rotor (10) via a nut connector (19).

4. The roller screw electromagnetic suspension with liquid cooling function according to claim 3, characterized in that: The bidirectional single-acting vane pump (21) comprises a vane pump housing (28), vane pump blades (24), a vane pump rotor (25), a pump shaft (22), an oil inlet (23) and an oil outlet (26); the vane pump housing (28) is embedded in one side of the upper end cover (2); The pump shaft (22), the vane pump rotor (25) and the vane pump blades (24) are all located in the vane pump housing (28); the pump shaft (22) is fixed at the center of the vane pump housing (28); the pump shaft connecting member (16) is fixed to one side of the pump shaft (22) and is fixedly connected to the pump shaft (22); a plurality of the vane pump blades (24) are arranged around the pump shaft (22) and are fixedly connected to the pump shaft (22); the vane pump rotor (25) is fixedly connected to the pump shaft (22) and rotates synchronously with the pump shaft (22); The oil inlet (23) and the oil outlet (26) are both arranged on the vane pump housing (28) and are respectively connected to one end of the coolant pipeline (27).

5. The roller screw electromagnetic suspension with liquid cooling function according to claim 1, characterized in that: The end of the lead screw (12) is also connected to an encoder (20), and the encoder (20) is used to pick up movement information of the lead screw (12) to achieve precise control of the working state of the electromagnetic suspension.

Images