Magnetic suspension motor and cooling fan

Abstract

The invention discloses a magnetic suspension motor and a cooling fan in the technical field of motors, the magnetic suspension motor comprises a mandrel, and a magnetic suspension radial magnetizing magnetic ring is fixed on the surface of the mandrel in the radial direction; the mandrel is arranged in a pipe body of the mounting pipe, and a stator assembly is arranged on the mounting pipe; the axial stabilizing assembly is installed at the end of the mandrel and used for suspension of the mandrel in the axial direction; when the motor is powered on, the stator assembly generates a suspension magnetic field to interact with the magnetic suspension radial magnetizing magnetic ring, and suspension of the mandrel in the radial direction is achieved. According to the motor, the mechanical contact installation mode of a transmission motor is changed, when the magnetic suspension motor is powered on to work, magnetic field force generated by an electronic assembly in the installation pipe interacts with the magnetic suspension radial magnetizing magnetic ring, the mandrel is made to suspend in the installation pipe, bearing connection is not needed, meanwhile, magnetic poles of the two magnets repel, and the magnetic suspension radial magnetizing magnetic ring is made to rotate. Mechanical contact of the mandrel is eliminated, friction and abrasion are reduced, and efficiency and stability are improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a magnetic levitation motor and a cooling fan. Background Art

[0002] A cooling fan is a device used for heat dissipation, which is widely used in electronic equipment, computers, household appliances, industrial equipment and other fields. Its main function is to remove the heat generated by the equipment by forcing air flow, thereby reducing the temperature of the equipment and ensuring its normal operation. Its fan blades are installed on the fan frame. After the motor in the fan frame is powered on, it drives the fan blades to rotate and discharge the hot air inside the equipment. Conventional motors use bearings to install fan blades. Although this can reduce most of the friction resistance, the friction between the bearing structures (mechanical contact) cannot be ignored and will reduce the service life of the motor. How to solve this kind of problem is what technicians need to solve. Summary of the invention

[0003] The purpose of the present application is to provide a magnetic levitation motor and a heat dissipation fan to solve the problems of friction and wear of mechanical contact when the motor rotates in the prior art, which affects the service life.

[0004] In order to achieve the above objectives, this application is implemented by adopting the following technical solutions: In a first aspect, the present application discloses a magnetic levitation motor, which comprises A mandrel, a magnetic suspension radial magnetizing ring is radially fixed on the surface of the mandrel; A mounting tube, wherein the mandrel is arranged in a tube body of the mounting tube, and a stator assembly is arranged on the mounting tube; An axial stabilization assembly, which is mounted at the end of the spindle and is used for suspending the spindle in an axial direction; When the motor is powered, the stator assembly generates a suspension magnetic field that interacts with the magnetic suspension radial magnetization ring to achieve suspension in the radial direction of the spindle.

[0005] According to a further solution of the present application, the stator assembly includes a fixed stator and a magnetically suspended stator, wherein the fixed stator is fixed on a side of the mounting tube facing the central axis, and the magnetically suspended stator is fixed on a side of the mounting tube facing away from the central axis, and winding coils are wound around the fixed stator and the magnetically suspended stator.

[0006] In a further solution, the transverse center lines of the magnetic suspension stator and the magnetic suspension radial magnetized magnetic ring are arranged colinearly.

[0007] A further solution of the present application also includes a magnet and a motor housing, wherein the magnet is fixed in the motor housing, and the stator assembly is arranged in the inner ring of the magnet.

[0008] In a further solution of the present application, the axial stability assembly includes an axially magnetized outer magnetic ring and an axially magnetized inner magnetic ring. The axially magnetized outer magnetic ring is fixed to the end of the installation tube. One end of the mandrel passes through the hole of the axially magnetized outer magnetic ring. The axially magnetized inner magnetic ring is radially fixed to the end of the mandrel passing through the hole through a connecting member. The axially magnetized inner magnetic ring and the axially magnetized outer magnetic ring interact with each other to axially suspend the mandrel.

[0009] In a further solution, the outer diameter of the axially magnetized inner magnetic ring is greater than the opening diameter of the axially magnetized outer magnetic ring.

[0010] In a further solution of the present application, when the motor is powered on, the mandrel is arranged collinearly with the axis of the installation tube.

[0011] In a second aspect, the present application discloses a cooling fan, which includes a fan outer frame, fan blades, and the above-mentioned magnetic levitation motor; One end of the installation tube of the magnetic levitation motor is fixedly connected to the fan outer frame, and one end of the mandrel of the magnetic levitation motor away from the fan outer frame is fixedly connected to the fan blades.

[0012] In a further solution of the present application, a mandrel seat is provided at the center of the fan blade, and the mandrel is installed in interference fit with the mandrel seat.

[0013] In a further solution of the present application, a circuit driving board is arranged between the fan outer frame and the stator assembly of the magnetic levitation motor by potting, and the circuit driving board is electrically connected to the magnetic levitation motor.

[0014] The beneficial effects of the present application are as follows: The motor in the present application changes the installation method of the mechanical contact of the driving motor. When this magnetic levitation motor is powered on and working, the magnetic field force generated by the electronic components in the installation tube interacts with the magnetic levitation radially magnetized magnetic ring, so that the mandrel floats in the copper tube without bearing connection. At the same time, the repulsion of the magnetic poles of the two magnets is used to eliminate the mechanical contact of the mandrel, reduce friction and wear, and improve efficiency and stability.

[0015] In addition, an axially magnetized outer magnetic ring and an axially magnetized inner magnetic ring are also arranged at the end of the motor. After the two magnetic rings are magnetized, a repulsive force is generated, which makes the mandrel float and rotate without friction, and can also reduce the jitter of the mandrel during rotation and prevent the high-speed rotating fan blades from falling off. Description of the Drawings

[0016] Figure 1 It is a cross-sectional view of the cooling fan in the embodiment of the present application; Figure 2 is Figure 1 a partial enlarged view of the central part in Figure 3Axial explosion diagram of the cooling fan in the present application; Figure 4 Partial structure axial explosion diagram of the magnetic levitation motor in the present application; Figure 5 Schematic diagram of the electromagnetic circuit of the magnetic levitation stator and the magnetic steel in the embodiment of the present application.

[0017] Wherein: 1. Fan blade; 2. Motor housing; 3. Magnetic steel; 4. Fixed stator; 5. Winding coil; 6. Circuit drive board; 7. Glue filling; 8. Installation tube; 9. Fixed ring; 10. Mandrel; 11. Mandrel seat; 12. Radially magnetized magnetic ring for magnetic levitation; 13. Magnetic levitation stator; 14. Axially magnetized outer magnetic ring; 15. Axially magnetized inner magnetic ring; 16. Connector; 17. Fan outer frame; 18. Electromagnetic circuit for fan operation; 19. Magnetic levitation electromagnetic circuit. Detailed implementation mode

[0018] 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. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation on the present application and its application or use.

[0019] As Figure 1 and Figure 2 shown, a cooling fan is disclosed in this embodiment. According to the actual motion scenario, it can be installed on electronic products and heat dissipation boxes, such as the mainframe case of a computer and a heat dissipation instrument. This cooling fan mainly consists of a fan blade 1 and a magnetic levitation motor. After the magnetic levitation motor is powered on, it drives the fan blade 1 to rotate rapidly, accelerating the gas flow and achieving the effect of cooling the heat dissipation body. Among them, the magnetic levitation motor avoids the design of using mechanical contact in traditional motors. In this embodiment, the magnetic levitation motor includes a mandrel 10, an installation tube 8, and an axial stability component. A radially magnetized magnetic ring 12 for magnetic levitation is radially fixed on the surface of the mandrel 10; the mandrel 10 is arranged inside the tube body of the installation tube 8, and a stator component is provided on the installation tube 8; the axial stability component is installed at the end of the mandrel 10 and is used for the suspension of the mandrel 10 in the axial direction. Among them, when the motor is powered on, the stator component generates a suspension magnetic field, which interacts with the radially magnetized magnetic ring 12 for magnetic levitation to achieve the suspension of the mandrel 10 in the radial direction; the magnetic field between the stator component and the radially magnetized magnetic ring 12 for magnetic levitation; the magnetic field inside the axial stability component realizes the radial and axial effects on the mandrel 10, so that the mandrel 10 is mostly only subject to air resistance damping during operation, greatly reducing the friction force.

[0020] As shown in the attached Figure 1 and Figure 3As shown, in this embodiment, the stator assembly includes a fixed stator 4 and a magnetic levitation stator 13. The fixed stator 4 is fixed on the side of the mounting tube 8 facing the mandrel 10. Usually, the mounting tube 8 is made of copper tube. During production, the fixed stator 4 and the mounting tube 8 are tightly fitted together through a crimping process. The magnetic levitation stator 13 is fixed on the side of the mounting tube 8 facing away from the mandrel 10. During production, the magnetic levitation stator 13 and the mounting tube 8 are tightly fitted together through a crimping process and are reinforced by dispensing glue. The fixed stator 4 and the magnetic levitation stator 13 are wound with winding coils 5. During design, the transverse centerlines of the magnetic levitation stator and the magnetic levitation radially magnetized magnetic ring 12 are collinear. When in use, the magnetic levitation stator 13 is energized to generate a suspension magnetic field. This setting of the relative position makes the force on the mandrel 10 more balanced and ensures the stability of suspension.

[0021] In a further embodiment, the magnetic levitation motor further includes a magnetic steel 3 and a motor housing 2. The magnetic steel 3 is fixedly bonded inside the motor housing 2 through a process. The stator assembly is arranged inside the inner ring of the magnetic steel 3, and the fixed stator 4 in the stator assembly faces the inner ring of the magnetic steel 3.

[0022] As shown in the appendix Figure 2 and Figure 4 As shown, in this embodiment, the axial stability assembly also controls suspension through a magnetic field. The axial stability assembly includes two opposite magnetic rings, an axially magnetized outer magnetic ring 14 and an axially magnetized inner magnetic ring 15. The axially magnetized outer magnetic ring 14 is fixed at the end of the mounting tube 8. One end of the mandrel 10 passes through the hole of the axially magnetized outer magnetic ring 14. The axially magnetized inner magnetic ring 15 is radially fixed at one end of the mandrel 10 passing through the hole through a connecting member 16. Usually, the connecting member 16 uses an iron snap ring to snap the axially magnetized inner magnetic ring 15 and prevent the fan blade 1 from falling off at the same time. The axially magnetized inner magnetic ring 15 and the axially magnetized outer magnetic ring 14 interact to make the mandrel 10 axially suspended. When in use, after the magnetic levitation stator 13 is energized, a magnetic field is formed and interacts with the magnetic levitation radially magnetized magnetic ring 12 to perform non-contact rotation, making the mandrel 10 suspended. In addition, the axially magnetized outer magnetic ring 14 and the axially magnetized inner magnetic ring 15 are axially magnetized. It should be noted here that the magnetic poles of the axially magnetized outer magnetic ring 14 and the axially magnetized inner magnetic ring 15 are placed repulsively, which makes the mandrel 10 further suspended, realizes friction rotation, and can reduce the jitter of the mandrel 10 during rotation and prevent the high-speed rotating fan blade 1 from falling off. In the device, in order to better prevent the fan blade 1 from falling off, during design, the outer diameter of the axially magnetized inner magnetic ring 15 is larger than the opening diameter of the axially magnetized outer magnetic ring 14.

[0023] In a further embodiment, when the motor is powered on, the mandrel 10 rotates in suspension. The mandrel 10 and the axis line of the mounting tube 8 are collinear. The fan blade 1 installed on the mandrel 10 rotates in the center. Figure 5 It can be seen from the figure the simulated states of the fan operation electromagnetic circuit 18 and the magnetic levitation electromagnetic circuit 19 when the cooling fan is powered on and in use.

[0024] In this embodiment, the cooling fan includes a fan outer frame 17, fan blades 1, and the above-mentioned magnetic levitation motor; one end of the installation pipe 8 of the magnetic levitation motor is fixedly connected to the fan outer frame 17, and one end of the mandrel 10 of the magnetic levitation motor away from the fan outer frame 17 is fixedly connected to the fan blade 1. Here, a mandrel seat 11 is integrally injection-molded at the center of the fan blade 1, and the mandrel 10 is fixedly installed with the mandrel seat 11. Here, an interference fit connection method can be used. Some technicians use riveting connection between the mandrel seat 11 and the mandrel to increase the fastening strength; during installation, a circuit driving board 6 is fixed between the fan outer frame 17 and the stator assembly of the magnetic levitation motor by potting 7. The circuit driving board 6 is electrically connected to the magnetic levitation motor, and the circuit driving board 6 can quickly regulate the speed of the motor; During installation, a fixing ring 9 is injection-molded and installed at the center of the fan outer frame 17, and the fixing ring 9 is axially riveted to the installation pipe 8 to play a role in fixing the installation pipe 8.

[0025] When the cooling fan in this embodiment is in use, its mandrel 10 floats inside the copper tube. Through the interaction of two-direction magnetic fields in the axial and radial directions, the interaction of forces is realized. Finally, the mandrel 10 is suspended during operation, eliminating the non-essential mechanical contact structure, greatly reducing the friction during the operation of the motor, achieving energy conservation and consumption reduction, and increasing the service life of the motor in disguise. At the same time, the installation of traditional bearings is eliminated, reducing the noise when the fan rotates.

[0026] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0027] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood through specific circumstances.

Claims

1. A magnetic levitation motor, characterized in that: include A mandrel (10), wherein a magnetic suspension radial magnetized magnetic ring (12) is radially fixed on the surface of the mandrel (10); A mounting tube (8), the mandrel (10) being arranged in a tube body of the mounting tube (8), and a stator assembly being arranged on the mounting tube (8); An axial stabilization component, the axial stabilization component is mounted on the end of the spindle (10) and is used for suspending the spindle (10) in an axial direction; When the motor is powered, the stator assembly generates a suspension magnetic field, interacting with the magnetic suspension radial magnetized magnetic ring (12) to achieve suspension of the spindle (10) in a radial direction.

2. The magnetic levitation motor according to claim 1, characterized in that: The stator assembly comprises a fixed stator (4) and a magnetic suspension stator (13); the fixed stator (4) is fixed to a side of the mounting tube (8) facing the mandrel (10); the magnetic suspension stator (13) is fixed to a side of the mounting tube (8) facing away from the mandrel (10); and winding coils (5) are wound around the fixed stator (4) and the magnetic suspension stator (13).

3. The magnetic levitation motor according to claim 2, characterized in that: The transverse center lines of the magnetic suspension stator (13) and the magnetic suspension radial magnetized magnetic ring (12) are arranged colinearly.

4. The magnetic levitation motor according to claim 1, characterized in that: It also comprises a magnetic steel (3) and a motor housing (2), wherein the magnetic steel (3) is fixed in the motor housing (2), and the stator assembly is arranged in the inner ring of the magnetic steel (3).

5. The magnetic levitation motor according to claim 1, characterized in that: The axial stabilization component comprises an axially magnetized outer magnetic ring (14) and an axially magnetized inner magnetic ring (15); the axially magnetized outer magnetic ring (14) is fixed to the end of the mounting tube (8); one end of the spindle (10) passes through a hole of the axially magnetized outer magnetic ring (14); the axially magnetized inner magnetic ring (15) is radially fixed to the end of the spindle (10) passing through the hole through a connecting piece (16); the axially magnetized inner magnetic ring (15) and the axially magnetized outer magnetic ring (14) interact with each other to allow the spindle (10) to be axially suspended.

6. The magnetic levitation motor according to claim 5, characterized in that: The outer diameter of the axially magnetized inner magnetic ring (15) is greater than the opening diameter of the axially magnetized outer magnetic ring (14).

7. The magnetic levitation motor according to claim 1, characterized in that: The motor is powered, and the spindle (10) is arranged colinearly with the axis of the mounting tube (8).

8. A cooling fan, characterized in that: It comprises a fan frame (17), a fan blade (1), and the magnetic levitation motor according to any one of claims 1 to 6; One end of the mounting tube (8) of the magnetic levitation motor is fixedly connected to the fan outer frame (17), and one end of the spindle (10) of the magnetic levitation motor away from the fan outer frame (17) is fixedly connected to the fan blade (1).

9. The heat dissipation fan according to claim 8, characterized in that: A spindle seat (11) is provided at the center of the fan blade (1), and the spindle (10) is fixedly mounted on the spindle seat (11).

10. The heat dissipation fan according to claim 8, characterized in that: A circuit drive board (6) is provided between the fan outer frame (17) and the stator assembly of the magnetic levitation motor, and the circuit drive board (6) is electrically connected to the magnetic levitation motor.

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