Permanent magnet coupler rotor

Abstract

The utility model relates to a permanent magnet coupler rotor, which comprises a conductor rotor and a permanent magnet rotor, the conductor rotor comprises a bottom plate and a conductor cylinder arranged on the bottom plate, the conductor rotor is arranged on a load shaft, and the permanent magnet rotor is arranged on a motor shaft. According to the utility model, the conductor rotor is arranged on the load shaft, and when the load shaft side is blocked, although the temperature of the conductor rotor is sharply increased due to increase of slip frequency, the conductor rotor is in a static state at the moment, so that explosion and galloping accidents are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic transmission, and in particular relates to a permanent magnet coupler rotor. Background Art

[0002] The existing permanent magnet couplers are divided into two types according to the rotor structure type: disc type and cylinder type. Both structures are mainly composed of two parts: the conductor rotor and the permanent magnet rotor. During the transmission process, the conductor rotor cuts the permanent magnetic field of the permanent magnet rotor to generate eddy current. In order to avoid overheating of the conductor rotor due to eddy current, the conductor rotor must be equipped with heat sinks or heat dissipation slots. In addition, in order to ensure efficient heat dissipation of the conductor rotor, all conductor rotors on the market are currently installed at the motor shaft end, so that the heat dissipation structure of the conductor rotor can always rotate at high speed, forming a fast air flow to discharge the heat of the conductor rotor.

[0003] The disadvantage of the above-mentioned traditional structure is that when the load side is locked, the slip between the conductor rotor and the permanent magnet rotor increases sharply, and the eddy current generated by the conductor rotor also increases sharply, resulting in a sharp increase in the temperature of the conductor rotor. High temperature will cause the mechanical strength of the conductor rotor to decrease significantly. At the same time, because the motor shaft drives the conductor rotor to rotate at a high speed, the result is that the conductor rotor explodes and runs away. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a permanent magnet coupler rotor, which can avoid the problem of explosion and runaway of the conductor rotor caused by load side stalling.

[0005] The technical solution adopted by the utility model is:

[0006] A permanent magnet coupler rotor comprises a conductor rotor and a permanent magnet rotor. The conductor rotor comprises a bottom plate and a cylindrical conductor cylinder arranged on the bottom plate. The conductor rotor is mounted on a load shaft, and the permanent magnet rotor is mounted on a motor shaft.

[0007] Furthermore, the permanent magnet rotor includes a magnetic cylinder bottom plate, a magnetic cylinder and an air guide cylinder arranged on the magnetic cylinder bottom plate, and a magnet arranged on the magnetic cylinder. The air guide cylinder is located outside the magnetic cylinder, and the conductor cylinder is located between the magnetic cylinder and the air guide cylinder, and there is a gap between the conductor cylinder and the magnetic cylinder and the air guide cylinder.

[0008] Furthermore, the permanent magnet rotor also includes a centrifugal exhaust impeller arranged on the outside of the bottom plate of the magnetic cylinder, and the centrifugal exhaust impeller is connected to the gap between the magnetic cylinder and the air guide cylinder.

[0009] Furthermore, a plurality of magnetic cavities are evenly arranged on the magnetic cylinder, and the magnets are installed in the magnetic cavities with clearance fit.

[0010] Furthermore, the permanent magnet rotor also includes a magnetic cylinder end cover arranged at the end of the magnetic cylinder, and the magnetic cylinder end cover closes the end of the magnetic cavity.

[0011] Furthermore, the magnets are neodymium iron boron magnets and are arranged in a Halbach array in the magnetic cylinder, and the magnetic lines of force of the entire circle of magnets are self-closed to form a closed annular magnetic field.

[0012] Furthermore, the coupling portion between the conductor cylinder and the permanent magnet rotor is made of pure conductor material.

[0013] Furthermore, the material of the air guide tube is high temperature resistant alloy steel material.

[0014] Furthermore, the gap between the conductor cylinder, the magnetic cylinder and the air guide cylinder is 4-5 mm.

[0015] Furthermore, the bottom plate is connected to the load shaft via a load flange, the bottom plate of the magnetic cylinder is connected to the motor shaft via a motor flange, the load flange, the motor flange and the corresponding load shaft and motor shaft are installed by interference fit, and transmission is achieved by key connection.

[0016] The positive effects of the utility model are:

[0017] The conductor rotor of the utility model is installed on the load shaft. When the load shaft side is blocked, although the temperature of the conductor rotor rises sharply due to the increase of slip difference, the conductor rotor is in a blocked and stationary state at this time, and the explosion and runaway accident will not occur.

[0018] At the same time, the inner and outer sides of the conductor cylinder are directly exposed to the air gap between the conductor cylinder and the magnetic cylinder and the air guide cylinder, so that the inner and outer surfaces of the conductor cylinder can directly exchange heat with the air. At the same time, due to the effect of centrifugal force, it can ensure that the outer cylindrical surface of the conductor cylinder will not accumulate dust during long-term operation, thereby ensuring the long-term stable operation of the equipment. The air flow formed by the centrifugal exhaust impeller can further improve the air flow in the air gap between the conductor cylinder and the magnetic cylinder and the air guide cylinder, realize convection heat exchange, and further improve the heat exchange effect. At the same time, the conductor cylinder on the conductor rotor cancels the ferromagnetic material design, and will not attract the permanent magnet rotor, avoiding the problem of attraction between the permanent magnet rotor and the conductor rotor and various iron tools during installation and disassembly, reducing the difficulty of equipment installation and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional schematic diagram of the fully coupled state of the utility model;

[0020] Figure 2 It is a cross-sectional schematic diagram of a partial coupling state of the utility model;

[0021] Figure 3 It is a schematic diagram of the load-side observation structure of the utility model in a partially coupled state;

[0022] Figure 4 This is a schematic diagram of the structure of the motor side observed in a partially coupled state of the utility model;

[0023] Figure 5 This is a schematic diagram of the conductor rotor structure of the utility model;

[0024] Figure 6 This is a schematic diagram of the cross-sectional structure of the conductor rotor of the utility model;

[0025] Figure 7 This is a schematic diagram of the permanent magnet rotor structure of the utility model;

[0026] Figure 8 It is a schematic diagram of the cross-sectional structure of the permanent magnet rotor of the utility model;

[0027] Fig. 9 This is a schematic diagram of the cross-sectional structure of the magnetic cylinder of the utility model;

[0028] Fig.10 This is a schematic diagram of the magnetic cylinder structure of the utility model;

[0029] Fig.11 This is an assembly diagram of the NdFeB magnet of the utility model. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0031] As attached Figure 1-11 As shown, the utility model provides a permanent magnet coupler rotor, including a load shaft 1, a load flange 2, a motor shaft 3, a motor flange 4, a conductor rotor 5 and a permanent magnet rotor 6. The load shaft 1 is coaxially arranged with the motor shaft 3, the conductor rotor 5 is installed on the load shaft 1 through the load flange 2, the permanent magnet rotor 6 is installed on the motor shaft 3 through the motor flange 4, the load flange 2 and the motor flange 4 are installed on the corresponding shafts by interference fit, and a flat key connection transmission is adopted.

[0032] The conductor rotor 5 is installed on the load shaft. When the load shaft 1 is blocked, although the temperature of the conductor rotor 5 will rise sharply due to the increase in slip, the conductor rotor is in a stationary state at this time and no explosion or runaway accident will occur.

[0033] The motor shaft 3 is not limited to a specific type and is mainly applicable to various asynchronous motors, synchronous motors, high and low voltage motors, AC motors, DC motors, etc. When the load shaft 1 is only used for vibration isolation transmission of equipment, it is not limited to a specific type and is applicable to various industrial loads, such as fans, pumps, compressors, belt conveyors, reducers, crushers and other industrial equipment; when the load shaft 1 equipment needs to be used at a reduced speed, the main applicable loads are centrifugal fans and water pumps, axial fans and water pumps.

[0034] The conductor rotor 5 includes a base plate 5-1 and a conductor cylinder 5-2. The radial cross-section of the conductor cylinder 5-2 is circular. The base plate 5-1 is located on one side of the conductor cylinder 5-2. The permanent magnet rotor 6 includes a magnetic cylinder base plate 6-1, a magnetic cylinder end cover 6-2, a magnetic cylinder 6-4, a magnet 6-5 and an air guide cylinder 6-6. The radial cross-sections of the magnetic cylinder 6-4 and the air guide cylinder 6-6 are both circular and coaxially arranged. The air guide cylinder 6-6 is located on the outside of the magnetic cylinder 6-4. The magnetic cylinder base plate 6-1 is located on one side of the air guide cylinder 6-6. A gap is left between the magnetic cylinder 6-4 and the air guide cylinder 6-6. When working, the conductor cylinder 5-2 is located in the gap between the magnetic cylinder 6-4 and the air guide cylinder 6-6, and there is a gap between the magnetic cylinder 6-4 and the air guide cylinder 6-6, forming two layers of air gaps. The thickness of each air gap is 4-5mm, which is conducive to gas circulation and heat exchange. A plurality of magnetic cavities are provided on the magnetic cylinder 6-4, and the magnets 6-5 are installed in the magnetic cavities with clearance fit and are sealed by an annular magnetic cylinder end cover 6-2.

[0035] The material of the air guide tube 6-6 is high temperature resistant alloy steel. The conductor tube 5-2 is made of pure conductor material without ferromagnetic material, so that the conductor rotor 5 and the permanent magnet rotor 6 are not attracted to each other. The magnet 6-5 is made of neodymium iron boron magnet.

[0036] At the same time, a centrifugal exhaust impeller 6-3 is provided on the outside of the magnetic cylinder bottom plate 6-1, which is connected with the gap between the magnetic cylinder and the air guide cylinder, and the gap between the conductor cylinder 5-2 and the magnetic cylinder and the air guide cylinder is used as an air flow cavity. Then, the centrifugal exhaust impeller 6-3 rotates to form a negative pressure to realize air entering the air flow cavity from the outside. The inner and outer layers of the conductor cylinder 5-2 can directly exchange heat with the air through convection, taking away the generated heat. At the same time, due to the effect of centrifugal force, it can ensure that the outer layer of the conductor cylinder 5-2 will not accumulate dust during long-term operation, thereby ensuring the long-term stable operation of the equipment. When it is necessary to adjust the coupling area between the permanent magnet rotor 6 and the conductor rotor 5, the motor is generally moved, that is, the motor moves forward and backward along the axial direction. According to the length of the magnet 6-5, the displacement of the motor is generally 10-180mm. After the motor is adjusted, attention should be paid to the uniformity of the size of the two-layer air gap between the permanent magnet rotor 6 and the conductor rotor 5, and the deviation of the air gap of the whole circle is required to be within 1mm.

[0037] As attached Figure 5 , 6As shown, the conductor rotor 5 is assembled by a bottom plate 5-1 and a conductor barrel 5-2, which are connected by bolts. The bottom plate 5-1 is connected to the load flange 2. The bottom plate 5-1 is generally made of high-strength and temperature-resistant materials with a thickness of 10-25 mm. A wide range of materials can be selected, such as 45# steel, Q345 series steel, etc. The conductor barrel 5-2 is made of materials with good conductivity and strength, such as copper alloy and aluminum alloy, preferably copper alloy. When making the conductor barrel of copper alloy material, it is not recommended to use plate rolling and welding. It is recommended to use copper alloy monolithic forging. The forged parts need to be annealed, solid solution and other heat treatments before finishing, which can effectively improve the strength and conductivity of the finished conductor barrel 5-2 and reduce the slight deformation in the later operation.

[0038] As attached Figure 7 , 8 As shown, the permanent magnet rotor 6 is assembled by a magnetic cylinder bottom plate 6-1, a magnetic cylinder end cover 6-2, a centrifugal exhaust impeller 6-3, a magnetic cylinder 6-4, a neodymium iron boron magnet 6-5, and an air guide cylinder 6-6. The magnetic cylinder bottom plate 6-1 is connected to the motor flange 4. The magnetic cylinder bottom plate 6-1 and the bottom plate 5-2 are made of high-strength and temperature-resistant materials. The magnetic cylinder end cover 6-2 is preferably made of non-magnetic austenitic stainless steel material. The centrifugal exhaust impeller 6-3 is made of ordinary carbon steel plate, which is made by laser cutting machine cutting and welding. After welding, it needs to be annealed. According to the different rotation directions of the load shaft 1, the blade directions of the centrifugal exhaust impeller 6-3 are different, and are divided into left-handed and right-handed. The magnetic cylinder 6-4 needs to be made of high-strength and non-magnetic materials, such as austenitic 304, 316, 6 series, and 7 series aluminum alloys, but no matter which material is used, forging reinforcement and demagnetization treatment are required. As Fig. 9 , Fig.10 , the magnetic cylinder 6-4 needs to be processed into a number of magnetic cavities. In order to ensure the accuracy of the magnetic cavity size, it is preferred to use electric spark machining to process the magnetic cavity. Fig.11 In order to effectively improve the magnetic energy utilization rate of the magnet 6-5 inside the magnetic cylinder 6-4, the magnet 6-5 is designed in a Halbach array arrangement.

[0039] The air guide tube 6-6 of the utility model adopts a whole tube design, guiding air from the load side into the gap between the conductor tube 5-2 and the air guide tube 6-6, and finally being discharged from the centrifugal exhaust impeller 6-3 and taking away the heat of the conductor tube 5-2. The air guide tube 6-6 adopts a whole tube design, and when the conductor rotor 5 is blocked, once the conductor melts and drips, it will be isolated and trapped in the air guide tube 6-6, which can avoid the accident of the molten conductor being thrown out.

[0040] The conductor rotor 5 and the permanent magnet rotor 6 of the utility model are not connected, but separated by an air gap, and rotate independently with their respective installed shafts; when the permanent magnet rotor 6 rotates, the permanent magnet rotor 6 and the conductor rotor 5 produce relative motion, and the conductor rotor 5 cuts the permanent magnetic field to generate an induced rotating magnetic field, and the induced rotating magnetic field interacts with the permanent magnetic field, thereby driving the conductor rotor 5 to rotate in the same direction as the permanent magnet rotor 6, and transferring the torque of the motor shaft 3 to the load shaft 1. Before the equipment is operated, the axial position of the motor shaft 3 is adjusted to adjust the magnetic field coupling area between the conductor rotor 5 and the permanent magnet rotor 6, so as to achieve a change in the load speed. The coupling area is large ( Figure 1 ), the transmitted torque is large and the load speed is high; the coupling area is small ( Figure 2 ), the transmitted torque is small and the load speed is low.

[0041] The utility model can effectively improve the heat dissipation efficiency of the conductor rotor 5, expand the use power of the air-cooled permanent magnet coupler, and avoid the attraction problem of the driven conductor rotor 5 and the permanent magnet rotor 6 and various iron tools during installation and disassembly, thereby reducing the difficulty of equipment installation and disassembly. When in use, by adjusting the axial position of the motor shaft 3 as needed, the load equipment can be operated at a reduced speed and energy saving.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A permanent magnet coupler rotor, comprising a conductor rotor (5) and a permanent magnet rotor (6), characterized in that The conductor rotor (5) comprises a base plate (5-1) and a cylindrical conductor cylinder (5-2) arranged on the base plate (5-1); the conductor rotor (5) is mounted on a load shaft (1); and the permanent magnet rotor (6) is mounted on a motor shaft (3).

2. A permanent magnet coupler rotor according to claim 1, characterized in that The permanent magnet rotor (6) comprises a magnetic cylinder bottom plate (6-1), a magnetic cylinder (6-4) and an air guide cylinder (6-6) arranged on the magnetic cylinder bottom plate (6-1), and a magnet (6-5) arranged on the magnetic cylinder (6-4); the air guide cylinder (6-6) is located outside the magnetic cylinder (6-4), and the conductor cylinder (5-2) is located between the magnetic cylinder (6-4) and the air guide cylinder (6-6), with a gap between the conductor cylinder (5-2) and the magnetic cylinder (6-4) and the air guide cylinder (6-6).

3. A permanent magnet coupler rotor according to claim 2, characterized in that The permanent magnet rotor (6) further comprises a centrifugal exhaust impeller (6-3) arranged outside the magnetic cylinder bottom plate (6-1), and the centrifugal exhaust impeller (6-3) is in communication with the gap between the magnetic cylinder (6-4) and the air guide cylinder (6-6).

4. A permanent magnet coupler rotor according to claim 2, characterized in that A plurality of magnetic cavities are evenly arranged on the magnetic cylinder (6-4), and the magnets (6-5) are installed in the magnetic cavities with a clearance fit.

5. A permanent magnet coupler rotor according to claim 4, characterized in that The permanent magnet rotor (6) further comprises a magnetic cylinder end cover (6-2) arranged at the end of the magnetic cylinder (6-4), and the magnetic cylinder end cover (6-2) closes the end of the magnetic cavity.

6. A permanent magnet coupler rotor according to claim 2, 4 or 5, characterized in that The magnet (6-5) is a neodymium iron boron magnet and is arranged in a Halbach array in the magnetic cylinder (6-4). The magnetic force lines of the entire circle of magnets (6-5) are self-closed to form a closed annular magnetic field.

7. A permanent magnet coupler rotor according to claim 1, characterized in that The conductor cylinder (5-2) of the coupling portion between the conductor rotor (5) and the permanent magnet rotor (6) is made of pure conductor material.

8. A permanent magnet coupler rotor according to claim 2, characterized in that The material of the air guide tube (6-6) is high-temperature resistant alloy steel material.

9. A permanent magnet coupler rotor according to claim 1, characterized in that The gap between the conductor cylinder (5-2) and the magnetic cylinder (6-4) is 3-5 mm, and the gap between the conductor cylinder (5-2) and the air guide cylinder (6-6) is 4-10 mm.

10. A permanent magnet coupler rotor according to claim 2, characterized in that The base plate (5-1) is connected to the load shaft (1) via a load flange (2); the magnetic cylinder base plate (6-1) is connected to the motor shaft (3) via a motor flange (4); the load flange (2), the motor flange (4) and the corresponding load shaft (1) and motor shaft (3) are installed by interference fit, and transmission is achieved by key connection.

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