Magnetic suspension pump device and life support system
By setting a hollow convex column sleeve on the first bracket of the magnetic levitation pump device and fixing the second iron core on the second bracket, the problems of complex assembly and unstable operation of the existing magnetic levitation pump device are solved, simple assembly and stable operation are achieved, and the stability and reliability of operation are improved.
Patent Information
- Application Number
- CN202510191443.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-05-27
AI Technical Summary
During the assembly and operation of existing magnetic levitation pump devices, there are complex methods of positioning and connecting iron cores, detection components and windings, resulting in large eccentricity of the rotor and motor body of the magnet levitation motor, complex control strategies, and need to be reprogrammed and calibrated after assembly.
By setting a hollow convex column on the first bracket, torque winding and suspended winding are installed on the convex column, and the second iron core is fixed on the second bracket. During assembly, only by inserting the second iron core into the convex column can the precise connection between the winding and the second iron core is achieved, optimizing the uniform distribution of magnetic flux to avoid leakage and invalid magnetic flux.
The simple assembly and stable operation of the magnetic levitation pump device are realized, reducing the eccentricity between the rotor center and the pump body center, improving the operation stability and reliability, and avoiding collision or friction between the rotor and the pump body.
Smart Images
Figure CN120037573A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of magnetic levitation technology, and particularly to a magnetic levitation pump device and a life support system. Background Art
[0002] Extracorporeal Circulation (ECC) is a life support technology that replaces the functions of the heart and lungs during cardiac surgery. As the core component of the extracorporeal circulation system, the performance of the magnetic levitation pump directly affects the success rate of the surgery and the safety of the patient.
[0003] In the existing magnetic levitation pump, the positioning and connection methods of the iron core, detection element, winding and the positional relationship between the two are relatively complex, and it causes a large eccentricity between the magnetic levitation motor rotor and the motor body. The motor depends greatly on the detection area range, frequency and control strategy of the rotor, or it is necessary to reprogram and calibrate the Hall position with the rotor after the motor is assembled to ensure the stable suspension and rotation of the rotor during the operation of the motor. Summary of the Invention
[0004] This application provides a magnetic levitation pump device and a life support system, which can ensure the simple assembly and stable operation of the magnetic levitation pump, and ensure less blood cell damage of the magnetic levitation pump.
[0005] In the first aspect of the embodiments of this application, a magnetic levitation device is provided, which includes a magnetic levitation pump and a controller. The magnetic levitation pump includes a pump body and a pump head. The pump body includes a first bracket, a torque winding, a suspension winding, and a bracket assembly. The pump head includes a rotor. The pump head is arranged on the top of the pump body. During operation, the rotor is in the center of the pump body without contact. The torque winding and the suspension winding are arranged on the first bracket.
[0006] The first bracket includes a reference center hole, a first end face two, a second end face two opposite to the first end face two, and a plurality of convex columns. A torque winding and a suspension winding are sleeved on each convex column. The torque winding and the suspension winding are sequentially sleeved on the outer surface of the convex column. The reference center hole is arranged at the center position of the first bracket, and the convex columns are arranged on the first end face two. The convex columns are of a hollow structure, and a plurality of convex columns are circumferentially and evenly distributed with the reference center hole as the reference.
[0007] The bracket assembly includes a second bracket and a second iron core.
[0008] The second bracket includes a bracket central hole, a first end face 1, a second end face 1 opposite to the first end face 1, a third end face 1, a mounting groove 1, a limiting end face and a sensor; the bracket central hole is located at the center of the second bracket, and the third end face 1 and the second end face 1 are adjacent stepped faces; on the second end face 1, there are provided a number of mounting grooves 1 that are evenly distributed circumferentially around the bracket central hole and penetrate to the first end face 1; on the first end face 1, there is an adjacent stepped face where the limiting end face and the first end face 1 are located, and the limiting end face and the mounting groove 1 are jointly used to fix the second iron core, and the limiting end face plays an axial limiting role in the installation of the second iron core, so that the height of the second iron core on the second bracket is consistent;
[0009] The positions and quantities of the convex columns correspond to those of the second iron core; the length of the second iron core is greater than the length of the hollow structure. During assembly, the second iron core is inserted into the hollow structure of the convex column, and the assembly of the first bracket and the bracket assembly can be completed.
[0010] In the second aspect of the embodiments of the present application, a life support system is provided, including:
[0011] A consumable set, a control host, and the magnetic levitation device of any one of the above. The pump head is arranged in the consumable set, and the pump body is arranged in the control host. When the consumable set is inserted into the control host, the pump head is inserted into the pump body.
[0012] The beneficial effects of the present application are:
[0013] In the present application, by providing a hollow convex column on the first bracket, with a torque winding and a suspension winding sleeved on the convex column, and fixing the second iron core on the second bracket, during assembly, only by inserting the second iron core into the hollow convex column, the precise connection between the winding and the second iron core can be realized, which is beneficial to the uniform distribution of the magnetic flux of the magnetic levitation motor, avoids magnetic leakage and reduces the ineffective magnetic flux;
[0014] Through the structural design of the second bracket, the circumferential distribution and height distribution of the second iron core on the second bracket are optimized to be uniform and fully fixed. During the operation of the rotor, the force distribution between the rotor and the second iron core can be made more uniform, thereby significantly reducing the eccentricity between the center of the rotor and the center of the pump body, making the radial gap between the rotor and the motor body more uniform, effectively avoiding the collision or friction between the rotor and the pump body, and improving the stability and reliability of the operation of the magnetic levitation device;
[0015] In the controller of the present application, the main control module controls the current of the torque winding through the first drive circuit and controls the current of the suspension winding through the second drive circuit. The first drive circuit and the second drive circuit are independent of each other and do not affect each other, which can ensure the safety performance of the circuit and avoid damage to one of the first drive circuit and the second drive circuit caused by the influence of the other. At the same time, the controller of the present application can also make the magnetic levitation pump rotate and levitate in five degrees of freedom, ensuring the stability of the operation of the magnetic levitation pump.
[0016] The present application uses magnetic force to suspend the rotating part (rotor) of the pump inside the pump head housing, so that there is no physical contact between the rotating part and the pump head housing and other fixed parts. This design avoids complications such as friction, heat generation caused by mechanical bearing contact points, blood damage (such as hemolysis) caused by insoluble particles, and thrombus. It has less blood damage, is not easy to form thrombus, and largely avoids complications such as stroke. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, where:
[0018] Figure 1a is a schematic structural diagram of a magnetic levitation pump in an embodiment of the present application;
[0019] Figure 1b is a schematic structural diagram inside the magnetic levitation pump in an embodiment of the present application;
[0020] Figure 2a is a schematic structural diagram inside the pump body in an embodiment of the present application;
[0021] Figure 2b is a cross-sectional view of the pump body in an embodiment of the present application;
[0022] Figure 3a is a schematic structural diagram of one end of the second bracket in an embodiment of the present application;
[0023] Figure 3b is a schematic structural diagram of the other end of the second bracket in an embodiment of the present application;
[0024] Figure 4 is a schematic structural diagram of the bracket assembly in an embodiment of the present application;
[0025] Figure 5a is a schematic structural diagram of one end of the first bracket in an embodiment of the present application;
[0026] Figure 5b Schematic diagram of the other end structure of the first bracket in an embodiment of the present application;
[0027] Figure 6a Schematic diagram before connection of the first bracket, coil and bracket assembly in an embodiment of the present application;
[0028] Figure 6b Schematic diagram after connection of the first bracket, coil and bracket assembly in an embodiment of the present application;
[0029] Figure 7 Schematic diagram of the controller, magnetic levitation pump and host computer in an embodiment of the present application;
[0030] Figure 8 is Figure 7 Schematic diagram of the setting method of the sensor in an embodiment of [];
[0031] Figure 9 Schematic diagram of the controller, magnetic levitation pump and host computer in another embodiment of the present application;
[0032] Figure 10 is Figure 9 Schematic diagram of the structure of the first drive circuit, first sampling circuit and torque winding in an embodiment of [];
[0033] Figure 11 is Figure 9 Schematic diagram of the structure of the first drive circuit, first sampling circuit and torque winding in another embodiment of [];
[0034] Figure 12 is Figure 9 Schematic diagram of the structure of the first drive circuit, first sampling circuit and torque winding in yet another embodiment of [];
[0035] Figure 13 is Figure 9 Schematic diagram of the structure of the first drive circuit, first sampling circuit and torque winding in an embodiment of [];
[0036] Figure 14 Schematic diagram of the structure of the cardiopulmonary bypass system in an embodiment of the present application;
[0037] Figure 15 Exploded structure schematic diagram of the cardiopulmonary bypass system in an embodiment of the present application;
[0038] Figure 16 Schematic diagram before docking of the magnetic levitation pump head and the pump body of the magnetic levitation pump in an embodiment of the present application. Specific embodiments
[0039] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
[0040] It should be noted that the terms "first" and "second" in the present application are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.
[0041] Referring to Figure 1a - 4 , in an embodiment of the present application, the magnetic levitation device includes a magnetic levitation pump and a controller. The magnetic levitation pump includes a pump head 1 and a pump body 2.
[0042] The pump body 2 includes a first iron core 23, a first bracket 24, a torque winding 26, a suspension winding 25, and a bracket assembly 20.
[0043] A rotor (not shown) is provided in the pump head 1. The pump head is arranged on the top of the pump body. When the magnetic levitation device works, the rotor is in the center of the pump body 2 without contact. The pump body 2 detects and controls the position of the rotor through the sensors on the bracket assembly 20 to maintain the stable suspension and rotation of the rotor in the center of the pump body 2.
[0044] The controller is used to control the magnetic levitation pump. The magnetic field generated after the controller controls the current input into the torque winding 26 is used to realize the rotation of the rotor, and the magnetic field generated after the current is input into the suspension winding 25 is used to realize the suspension of the rotor.
[0045] Please continue to refer to Figure 2a - 2b and Figure 4 , the bracket assembly 20 includes a second bracket 22 and a second iron core 21. The second iron core 21 is in an L shape. The second iron core 21 is configured in multiple numbers and can be designed as 4, 6, 8, 12 according to needs, preferably designed as 6 or 8; taking 6 as an example, the second iron cores 21 are evenly distributed along the circumference of the second bracket 22 and fixedly connected, preferably fixedly connected by bonding or interference fit;
[0046] Please refer to Figure 3a - 3b , the second bracket 22 includes a bracket center hole 221, a first end face 222, a second end face 223 opposite to the first end face 222, a third end face 224, a fourth side face 225, a first mounting groove 2231, a second mounting groove 2241, a sensor 27, and a limiting end face 226.
[0047] In an embodiment, the bracket center hole 221 is located at the center position of the second bracket 22; the first end face 222 is located at one end of the second bracket 22 and is opposite to the second end face 223. The third end face 224 and the second end face 223 are designed as adjacent stepped faces, facilitating the formation of more space and being conducive to the installation of other components.
[0048] In an embodiment, six first mounting grooves 2231 that are circumferentially and uniformly distributed with the bracket center hole 221 as the reference and penetrate through to the first end face 222 are provided on the second end face 223. The shape of the first mounting groove 2231 is rectangular. Six limiting end faces 226 are provided on the first end face 222 and are adjacent to the first end face 222 in a stepped manner. The limiting end faces 226 and the first mounting grooves 2231 are jointly used to fix the second iron core 21. The six first mounting grooves 2231 are uniformly arranged around the bracket center hole 221. The machining accuracy of the second bracket is stable, and the concentricity accuracy of the first mounting groove 2231 during machining is ≤0.1 mm, which can ensure that after the second iron core 21 is installed on the second bracket 22, its circumferential distribution on the second bracket 22 is uniform and consistent, and the concentricity accuracy of the six iron core fitting circles with respect to the bracket center hole 221 is ≤0.1 mm; meanwhile, the six limiting end faces 226 play an axial limiting role in the installation of the six second iron cores 21, making the height distribution of the second iron cores 21 on the second bracket 22 uniform and consistent, and the height difference accuracy of the second iron cores 21 is ≤0.1 mm. The second bracket 22 realizes the precise positioning and connection of the second iron core 21, making the circumferential distribution and height distribution of the second iron core 21 on the second bracket 22 uniform and consistent after installation. When the rotor operates, the force on the second iron core 21 inside the rotor is more uniform, and the eccentricity between the rotor center and the pump body 2 center is small.
[0049] Preferably, the concentricity accuracy of the six second iron core fitting circles with respect to the bracket center hole 221 can be ≤0.05 mm, and the height difference accuracy of the second iron cores 21 can be ≤0.05 mm, ensuring higher installation uniformity and consistency of the second iron cores 21. It should be noted that the number of the first mounting grooves 2231 for fixing the second iron core 21 corresponds to the number of the second iron cores 21 and can be designed as 4, 6, 8, 12 according to needs, and preferably designed as 6.
[0050] In an embodiment, please refer to Figure 3a - 3b, on the third end face 224, there are mounting grooves two 2241 which are circumferentially and evenly distributed with the center hole 221 of the bracket as the reference. Blind holes are formed at the bottom of the mounting grooves two 2241. Among them, the shape of the mounting grooves two 2241 is rectangular or circular, and is used for fixedly connecting 6 sensors 27. The 6 mounting grooves two 2241 are machined with the center hole 221 of the bracket as the reference. The machining accuracy of the second bracket is stable, and the concentricity accuracy of the machining of the mounting grooves two is ≤0.1 mm, which can ensure that the 6 sensors 27 are evenly distributed circumferentially on the bracket after being installed on the bracket, so that the concentricity accuracy of the fitting circle of the 6 sensors 27 to the center hole 221 of the bracket is ≤0.1 mm; at the same time, the blind holes at the bottom of the mounting grooves two 2241 play an axial limiting role in the installation of the 6 sensors 27, so that the height distribution of the sensors 27 on the bracket is uniform, and the height difference accuracy of the sensors 27 is ≤0.1 mm. The second bracket realizes the precise positioning and connection function for the sensor 27 group, so that the circumferential distribution and height distribution of the sensors 27 on the second bracket are uniform after installation, improving the distribution accuracy of the sensors 27 and reducing the detection error of the sensor 27 group for the rotor. At the same time, both the sensor 27 and the second iron core are machined with the center of the second bracket as the reference, so that the relative position between the second iron core and the sensor 27 is accurately guaranteed, reducing the detection area range and frequency of the sensor 27 group, and making the control strategy during the motor drive and the suspension of the rotor simpler.
[0051] It can make the concentricity accuracy of the fitting circle of the 6 sensors 27 to the center hole 221 of the bracket ≤0.05 mm, and the height difference accuracy of the sensors 27 ≤0.05 mm, ensuring higher installation uniformity and consistency of the sensors 27. It should be noted that the number of the mounting grooves two 2241 corresponds to the number of the sensors 27. For the number of slots of the mounting grooves two 2241 for fixing the sensors 27, it can be designed as 4, 6, 8, 10, 12 according to the application of the magnetic levitation motor, and preferably designed as 6, 8, 10.
[0052] Please refer to Figure 5a - 5b , the first bracket 24 includes a reference center hole 241, a first end face two 242, a second end face two 245 opposite to the first end face, a third end face two 246, a convex column 243 and a groove 247. Among them, the reference center hole 241 is located at the center of the first bracket 24. The convex column 243 is arranged on the first end face two 242. The convex column 243 is circumferentially and evenly distributed with the center hole 221 of the bracket as the reference, and its position and number correspond to the number of the second iron cores 21. It can be designed as 4, 6, 8, 12 according to needs, and preferably 6. The inside of the convex column 243 is a hollow structure, and this structure is designed as a through structure.
[0053] Please refer to Figure 2a - 2b and Figure 6a - 6b, a torque winding 26 and a suspension winding 25 are successively sleeved on the outer surface of the convex column 243 from bottom to top, so as to accurately ensure the circumferential distribution position of the windings relative to the first bracket 24; the inside of the convex column 243 is a hollow structure for fixing the second iron core 21, so as to accurately ensure the circumferential distribution position of the second iron core 21 relative to the first bracket 24. The second iron core 21 has been circumferentially distributed and fixed on the second bracket 22, so that only through the convex column 243, the corresponding and fixed connection of the assembly relationship between the first bracket 24 and the bracket assembly 20 is completed, thereby accurately ensuring the connection position relationship between the windings (25, 26) and the second iron core 21, which is beneficial to the uniform distribution of the magnetic flux of the magnetic suspension motor, avoids magnetic leakage and reduces the ineffective magnetic flux. After the assembly between the first bracket 24 and the bracket assembly 20 is as Figure 6b shown.
[0054] A groove 247 is formed on the second end face 245 of the first bracket 24 of the present application. The groove 247 is based on the bracket central hole 221 and forms a third end face 246. The end face 246 has an axial limiting function and can limit the installation height of the first iron core 23. Through the groove 247 and the end face 246, the radial position and the axial position of the first iron core 23 relative to the first bracket 24 are accurately ensured, which is beneficial to further ensuring the uniform distribution of the magnetic flux of the overall magnetic suspension motor.
[0055] Please refer to Figure 7 , the controller includes a main control module 110, a first drive circuit 130, a second drive circuit 140, and a power supply module 150.
[0056] The main control module 110 is the core module in the controller and is used to coordinate the cooperation of each module in the controller. The main control module 110 is electrically connected to the sensor 27. The sensor 27 is used to detect the target parameters of the rotor, and the target parameters include at least one of the current position and the current angle. In an embodiment, the sensor 27 is specifically used to detect the current position and the current angle of the rotor. In an embodiment, according to the different rotor materials and the design details of the magnetic suspension pump, the sensor 27 can be a Hall sensor, an eddy current sensor, or a combination of different types of sensors, that is, the sensor 27 includes at least one of a Hall sensor and an eddy current sensor. These sensors can reflect the current position (distance from the boundary) and the current rotation angle of the rotor at any moment by sensing physical quantities such as magnetic fields and currents. In a specific embodiment, the sensor 27 is a Hall sensor, and specifically a linear Hall sensor, as Figure 8 shown. In a specific example, the number of the sensors 27 is multiple ( Figure 8(schematically shown by six), multiple sensors 27 are evenly distributed in the circumferential direction of the rotor, and the multiple sensors 27 are symmetrically distributed about the center of the rotor. At this time, a straight line is formed by connecting two sensors 27 that are symmetric about the center of the rotor. These two sensors 27 can reflect the offset position of the rotor relative to this straight line. At the same time, the sine curve measured by the multiple sensors 27 can obtain the current angle of the rotor. It should be noted that this application does not specifically limit the type and quantity of the sensors 27, as long as at least one of the current position and the current angle of the rotor can be detected by the sensors 27.
[0057] The first drive circuit 130 is electrically connected to the main control module 110 and the torque winding 26, and is used to output current to the torque winding 26 under the control of the main control module 110. Specifically, the main control module 110 controls whether to output current to the torque winding 26 and the magnitude of the current output to the torque winding 26 through the first drive circuit 130. That is to say, the magnitude of the current output by the first drive circuit 130 is controlled by the main control module 110.
[0058] The second drive circuit 140 is electrically connected to the main control module 110 and the suspension winding 25, and is used to output current to the suspension winding 25 under the control of the main control module 110. Specifically, the main control module 110 controls whether to output current to the suspension winding 25 and the magnitude of the current output by the suspension winding 25 through the second drive circuit 140. That is to say, the magnitude of the current output by the second drive circuit 140 is controlled by the main control module 110.
[0059] The power supply module 150 is used to supply power to the first drive circuit 130, the second drive circuit 140, and the main control module 110, and is the energy source in the controller.
[0060] Among them, the main control module 110 is used to control the output current of the first drive circuit 130 and the second drive circuit 140 according to the target parameters collected by the sensors 27. Specifically, the main control module 110 controls the output current of the first drive circuit 130 according to the target parameters collected by the sensors 27, so that the torque winding 26 generates a magnetic field to realize the rotation of the rotor. And the main control module 110 controls the output current of the second drive circuit 140 according to the target parameters collected by the sensors 27, so that the suspension winding 25 generates a magnetic field to realize the suspension of the rotor.
[0061] As can be seen from the above, the main control module 110 controls the current of the torque winding 26 through the first drive circuit 130 and controls the current of the suspension winding 25 through the second drive circuit 140. The first drive circuit 130 and the second drive circuit 140 are independent of each other and do not affect each other, which can ensure the safety performance of the circuit and prevent one of the first drive circuit 130 and the second drive circuit 140 from being damaged due to the influence of the other. At the same time, the controller of the present application can also make the magnetic levitation pump rotate and levitate in five degrees of freedom, ensuring the stability of the operation of the magnetic levitation pump.
[0062] Continuing to refer to Figure 7 , the controller further includes a signal conditioning module 121, which is electrically connected to the main control module 110 and the sensor 27. The signal output by the sensor 27 is conditioned by the signal conditioning module 121 and then output to the main control module 110. The signal conditioning by the signal conditioning module 121 includes at least one of amplifying the signal and filtering the signal. The signal conditioning module 121 can remove the noise components in the signal output by the sensor 27 or amplify the useful components in the signal, which can improve the accuracy of the subsequent signal processing by the main control module 110. It should be noted that the signal conditioning module 121 may not be provided in other embodiments.
[0063] Referring to Figure 10 , the first drive circuit 130 is specifically a three-phase inverter current, which is used to convert the current input by the power supply module 150 into three-phase electricity and supply it to the torque winding 26, and the second drive circuit 140 is also specifically a three-phase inverter current, which is used to convert the current input by the power supply module 150 into three-phase electricity and supply it to the suspension winding 25. The structures of the first drive circuit 130 and the second drive circuit 140 may be the same or different.
[0064] Among them, the first drive circuit 130 is a full-bridge inverter circuit or an H-bridge inverter circuit, and the second drive circuit 140 can also be a full-bridge inverter circuit or an H-bridge inverter circuit. The present application does not limit the specific structures of the first drive circuit 130 and the second drive circuit 140.
[0065] Continuing to refer to Figure 9 , the controller further includes a first sampling circuit 160 and a second sampling circuit 170.
[0066] The first sampling circuit 160 is electrically connected to the first driving circuit 130 and the main control module 110. The first sampling circuit 160 is used to sample the output current of the first driving circuit 130. The second sampling circuit 170 is electrically connected to the second driving circuit 140 and the main control module 110. The second sampling circuit 170 is used to sample the output current of the second driving circuit 140. Among them, the main control module 110 is specifically used to: control the output current of the first driving circuit 130 according to the target parameters collected by the sensor 27 and the current sampled by the first sampling circuit 160, and control the output current of the second driving circuit 140 according to the target parameters collected by the sensor 27 and the current sampled by the second sampling circuit 170.
[0067] Specifically, the main control module 110 accurately controls the current of the torque winding 26 according to the target parameters of the rotor and the output current of the first driving circuit 130 by using the decoupling algorithm and the field-oriented control (FOC) algorithm to ensure the rotation function of the rotor. And the main control module 110 accurately controls the current of the suspension winding 25 according to the target parameters of the rotor and the output current of the second driving circuit 140 by using the decoupling algorithm and the field-oriented control (FOC) algorithm to realize the suspension of the rotor.
[0068] Among them, the structures of the first sampling circuit 160 and the second sampling circuit 170 may be the same or different.
[0069] Among them, according to different current sampling principles, the first sampling circuit 160 can use a Hall current sensor to sample the output current of the first driving circuit 130, or the first sampling circuit 160 can also sample the output current of the first driving circuit 130 by connecting a resistor in series in the circuit.
[0070] Among them, when the first driving circuit 130 is an inverter circuit, the first sampling circuit 160 is a three-resistor sampling circuit, a two-resistor sampling circuit or a single-resistor sampling circuit. Refer to Figure 10 When the first sampling circuit 160 is a three-resistor sampling circuit, the first sampling circuit 160 includes three sampling resistors 161. At this time, the currents of the three lower bridge arms in the first driving circuit 130 are respectively obtained through the three sampling resistors 161 to obtain valid data. Refer to Figure 11 When the first sampling circuit 160 is a two-resistor sampling circuit, the first sampling circuit 160 includes two sampling resistors 161. At this time, the currents of any two lower bridge arms in the first driving circuit 130 are respectively obtained through the two sampling resistors 161 to obtain valid data. Refer to Figure 12 When the first sampling circuit 160 is a single-resistor sampling circuit, the first sampling circuit 160 includes a sampling resistor 161, and the sampling resistor 161 is connected in series on the DC bus for sampling.
[0071] Among them, in combination withFigure 10 and Figure 13 When the first sampling circuit 160 is a three-resistor sampling circuit, depending on the position of the sampling resistor 161, the first sampling circuit 160 can specifically be a low-end sampling circuit (as shown in Figure 10 ), or a high-end sampling circuit (as shown in Figure 13 ). Continuing to refer to Figure 10 and Figure 13 , compared with the low-end sampling circuit, when the first sampling circuit 160 is a high-end sampling circuit, since the sampling resistor 161 directly samples the arm output current of the first driving circuit 130, the current value sampled by the first sampling circuit 160 is the actual output current of the first driving circuit 130. Therefore, there is no need to use an algorithm to reconstruct and calculate the current sampled by the first sampling circuit 160, which is convenient to use and simple and efficient. Similarly, when the first sampling circuit 160 is a two-resistor sampling circuit, the first sampling circuit 160 can also be a low-end sampling circuit or a high-end sampling circuit, which will not be elaborated here. All in all, this application does not limit the specific structures of the first sampling circuit 160 and the second sampling circuit 170, as long as the first sampling circuit 160 can sample the output current of the first driving circuit 130 and the second sampling circuit 170 can sample the output current of the second driving circuit 140.
[0072] Continuing to refer to Figure 9 , the controller further includes a first protection circuit 180 and a second protection circuit 190.
[0073] The first protection circuit 180 is electrically connected to the first driving circuit 130, the first sampling circuit 160, and the main control module 110, and is used to cut off the output of the first driving circuit 130 when the current sampled by the first sampling circuit 160 is greater than the first current threshold. Specifically, when the current sampled by the first sampling circuit 160 is greater than the first current threshold, it indicates that the first driving circuit 130 may be abnormal. Therefore, in order to protect the circuit and the torque winding 26, the first protection circuit 180 cuts off the output of the first driving circuit 130 to prevent accidents. At the same time, the first protection circuit 180 also sends the protection status of the first driving circuit 130 to the main control module 110 for the main control module 110 to perform data analysis afterwards.
[0074] Similarly, the second protection circuit 190 is electrically connected to the second drive circuit 140, the second sampling circuit 170, and the main control module 110. When the current collected by the second sampling circuit 170 is greater than the second current threshold, the second protection circuit 190 cuts off the output of the second drive circuit 140. Specifically, when the current collected by the second sampling circuit 170 is greater than the second current threshold, it indicates that the second drive circuit 140 may be abnormal. Therefore, to protect the circuit and the 24 floating windings 25, the second protection circuit 190 cuts off the output of the second drive circuit 140 to prevent accidents. At the same time, the second protection circuit 190 also sends the protection status of the second drive circuit 140 to the main control module 110 for the main control module 110 to perform data analysis afterwards.
[0075] Among them, the first current threshold and the second current threshold may be equal or unequal, and can be specifically set according to actual situations. At the same time, the structures of the first protection circuit 180 and the second protection circuit 190 may be the same or different, which is not limited here.
[0076] Continue to refer to Figure 9 , the controller further includes a communication module 200. The communication module 200 is electrically connected to the main control module 110 and is used for communicating with the host computer 210. Specifically, the main control module 110 can send the operating status of the magnetic levitation motor (such as the current position of the rotor, the current rotation angle, etc.) to the host computer 210, and the host computer 210 can also control the magnetic levitation motor through the communication module 200, such as adjusting the rotation speed of the magnetic levitation motor. Among them, the power supply module 150 also supplies power to the communication module 200.
[0077] Among them, the communication module 200 can specifically be a wireless Bluetooth module or a Wi-Fi communication module, etc. The specific type of the communication module 200 is not limited in this application.
[0078] This application also protects a life support system. Please refer to Figure 14 - 16 , which includes a consumable kit 3, a control host 4, and a controller. A pump head 1 of a magnetic levitation pump is arranged in the consumable kit 3, and a pump body 2 of the magnetic levitation pump is arranged in the control host 4. The positions of the pump head 1 and the pump body 2 correspond to each other. The pump head, the pump body, and the controller have the same structures as those in any of the above embodiments. For the specific structures of the magnetic levitation pump and the controller, reference can be made to the above relevant content, which will not be elaborated here. It should be noted that the magnetic levitation pump and the controller of this application can be applied not only to an extracorporeal life support system but also to other devices, which is not limited here.
[0079] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.
Claims
1. A magnetic suspension device, comprising a magnetic suspension pump and a controller, wherein the magnetic suspension pump comprises a pump body and a pump head, characterized in that: The pump body includes a first bracket, a torque winding, a suspension winding, and a bracket assembly, and the pump head includes a rotor; the pump head is arranged on the top of the pump body, and when working, the rotor is located at the center of the pump body without contact; the torque winding and the suspension winding are arranged on the first bracket; The first bracket includes a reference center hole, a first end face 2, a second end face 2 opposite to the first end face 2, and a plurality of convex columns; a torque winding and a suspension winding are sleeved on each convex column; the torque winding and the suspension winding are sleeved on the outer surface of the convex column in sequence; the reference center hole is set at the center position of the first bracket, and the convex column is set on the first end face 2; the convex column is a hollow structure, and the plurality of convex columns are evenly distributed circumferentially with the reference center hole as the reference; The bracket assembly includes a second bracket and a second iron core; The second bracket includes a bracket center hole, a first end face 1, a second end face 1 opposite to the first end face 1, a third end face 1, a mounting groove 1, a limit end face and a sensor; the bracket center hole is located at the center of the second bracket, and the third end face 1 is an adjacent face with a step of the second end face 1; the second end face 1 is provided with a plurality of mounting grooves 1 uniformly distributed around the circumference of the bracket center hole and penetrating to the first end face 1; the first end face 1 is provided with a limit end face adjacent face with a step of the first end face 1, the limit end face and the mounting groove 1 are used together to fix the second iron core, and the limit end face plays an axial limit role in the installation of the second iron core, so that the height of the second iron core on the second bracket is consistent; The position and number of the protruding columns correspond to the second core; the length of the second core is greater than the length of the hollow structure. During assembly, the second core is inserted into the hollow structure of the protruding columns to complete the assembly of the first bracket and the bracket assembly.
2. The magnetic suspension device according to claim 1, characterized in that: When the second iron core is inserted into the protruding column, the length of the second iron core is greater than the sum of the heights of the torque winding and the suspension winding.
3. The magnetic suspension device according to claim 1, characterized in that: The pump body also includes a first iron core, and the first bracket also includes a groove and a third end face 2. The groove is opened on the second end face 2, the groove is concentric with the reference center hole, and the third end face 2 is formed between the groove and the reference center hole; the first iron core is fixed in the groove and positioned by the groove and the third end face 2.
4. The magnetic suspension device according to claim 1, characterized in that: The second bracket also includes a second mounting groove, which is arranged on the third end face one and is evenly distributed along the circumference of the center hole of the bracket. The sensor is fixed in the second mounting groove, and the multiple sensors are evenly distributed in the circumferential direction of the rotor, and the multiple sensors are symmetrically arranged about the center of the rotor.
5. The magnetic suspension device according to claim 1, characterized in that: The controller includes: A main control module, electrically connected to the sensor, and used to obtain a target parameter of the rotor detected by the sensor, the target parameter including at least one of a current position and a current angle; A first drive circuit is electrically connected to the main control module and the torque winding, and is used to output current to the torque winding under the control of the main control module; A second driving circuit is electrically connected to the main control module and the suspension winding, and is used to output current to the suspension winding under the control of the main control module; A power supply module, used to supply power to the first drive circuit, the second drive circuit and the main control module; The main control module is used to: control the output current of the first drive circuit and the second drive circuit according to the target parameters collected by the sensor; A first sampling circuit is electrically connected to the first driving circuit and the main control module, and the first sampling circuit is used to sample the output current of the first driving circuit; A second sampling circuit is electrically connected to the second driving circuit and the main control module, and the second sampling circuit is used to sample the output current of the second driving circuit; The main control module is specifically used to control the output current of the first drive circuit according to the target parameters collected by the sensor and the current sampled by the first sampling circuit, and to control the output current of the second drive circuit according to the target parameters collected by the sensor and the current sampled by the second sampling circuit.
6. The magnetic suspension device according to claim 5, characterized in that: The first driving circuit is an inverter circuit, and the first sampling circuit is a three-resistance sampling circuit, a dual-resistance sampling circuit or a single-resistance sampling circuit; When the first sampling circuit is a three-resistor current sampling circuit or a dual-resistor sampling circuit, the first sampling circuit is a low-end sampling circuit or a high-end sampling circuit.
7. The magnetic suspension device according to claim 5, characterized in that: The controller also includes: A first protection circuit is electrically connected to the first drive circuit, the first sampling circuit, and the main control module, and is used to cut off the output of the first drive circuit when the current sampled by the first sampling circuit is greater than a first current threshold; The second protection circuit is electrically connected to the second driving circuit, the second sampling circuit and the main control module, and is used to cut off the output of the second driving circuit when the current sampled by the second sampling circuit is greater than the second current threshold.
8. The magnetic levitation device according to claim 1, characterized in that: The first driving circuit is a full-bridge inverter circuit or an H-bridge inverter circuit, and the second driving circuit is a full-bridge inverter circuit or an H-bridge inverter circuit.
9. The magnetic levitation device according to claim 1, characterized in that: The controller also includes: A signal conditioning module, electrically connected to the sensor and the main control module, for conditioning the signal output by the sensor and outputting it to the main control module, wherein the conditioning includes at least one of amplification processing and filtering processing; The communication module is electrically connected to the main control module and is used to communicate with the host computer.
10. A life support system, characterized in that: include: A consumables package, a control host, and a magnetic levitation device according to any one of claims 1 to 9, wherein the pump head is arranged in the consumables package, and the pump body is arranged in the control host. When the consumables package is inserted into the control host, the pump head is inserted into the pump body.