A permanent magnet right angle reducer
By designing a permanent magnet right-angle reducer, the alternating arrangement of the L-shaped magnetic field modulation ring and the magnetic permeable block is achieved, and the impact, wear, vibration and noise problems of mechanical gear reducers are solved. It also overcomes the size and density limitations of the permanent magnet right-angle reducer, and improves the torque density and life of the equipment.
Patent Information
- Application Number
- CN202011281737.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2020-08-04
- Filing Date
- 2020-11-16
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2040-11-16
AI Technical Summary
Existing mechanical gear reducers are prone to problems such as toothing, wear, energy waste, vibration transmission, no overload protection and high noise when load impact and high rotation speed. In addition, permanent magnet right-angle reducers have large equipment size and rotation The problem of low moment density.
A permanent magnet right-angle reducer is designed, using an L-shaped magnetic field modulation ring and multiple magnetic permeable blocks, and the magnetic field transmission is achieved through a non-metal isolation sleeve and magnetic permeable block, and the alternating arrangement of the rotor permanent magnet and magnetic permeable block is formed. Air gap realizes non-contact transmission of power and is suitable for working conditions where the drive system is placed vertically with the load.
It realizes the demand for low speed and high torque, improves torque density, overcomes the use limitations of traditional permanent magnet reducers, reduces noise and vibration, extends the equipment life, and avoids energy waste and wear of mechanical connections.
Smart Images
Figure CN112510962B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of reducers, and in particular to a permanent magnet right-angle reducer. Background Art
[0002] In industry, most equipment has high requirements for operating torque but not much demand for operating speed. However, the speed of commonly used asynchronous motors is relatively fixed, and it is difficult to output high torque at low speed. Therefore, it is necessary to install a reducer between the motor and the load to reduce the speed of the transmission system while increasing the transmission torque.
[0003] In some special occasions, such as belt conveyors, scraper conveyors and other equipment, due to limited installation space, the drive system and the load roller are often placed vertically, and the two need to be connected through a right-angle reducer. The input and output shafts of the right-angle reducer are arranged vertically, which can make the axis of the rotating shaft rotate 90° in a certain plane and then connect to the load.
[0004] Most of the existing reduction gearboxes are mechanical gear type, which increase or decrease the torque by meshing between gears with different numbers of teeth. The mechanical structure is simple and effective, but there are the following disadvantages during operation:
[0005] 1. When the load impact is strong, mechanical gears often have the phenomenon of tooth hitting, causing gear damage;
[0006] 2. When the load speed requirement is high, the wear between the mechanical gears will cause a large waste of energy and affect the efficiency of the transmission system. At the same time, the wear will also shorten the service life of the gears.
[0007] 3. Mechanical gears need to use lubricating oil to maintain their working condition and reduce the temperature rise during operation. The equipment needs to be regularly inspected and oiled during use;
[0008] 4. The purely rigid mechanical connection between the motor and the load will cause the load vibration to be transmitted to the motor, affecting the motor's operating state and shortening the service life of the entire system;
[0009] 5. It has no overload protection function and is easily damaged when the load is stuck;
[0010] 6. The mechanical gear reducer produces a lot of noise during operation.
[0011] In the prior art, most permanent magnet reducers are coaxial structures. When the drive system is placed perpendicular to the load, a right-angle reducer is required for conversion. The only permanent magnet reducer that can arrange the input and output shafts at right angles uses a bevel gear structure. The radial size of the equipment is large and the overall torque density of the equipment is low, which is difficult to meet actual needs. Summary of the invention
[0012] In order to solve the above problems, the permanent magnet right-angle reducer proposed in the present invention solves the problems raised in the background technology.
[0013] To achieve the above object, the technical solution adopted by the present invention is:
[0014] A permanent magnet right-angle reducer, comprising
[0015] A magnetic field modulation ring, wherein the magnetic field modulation ring is an "L"-shaped structure, comprising a first straight line segment, a second straight line segment perpendicular to the first straight line segment, and a connecting segment connecting the first straight line segment and the second straight line segment; the magnetic field modulation ring comprises a non-metallic isolation sleeve and a plurality of magnetic conductive blocks, the non-metallic isolation sleeve is provided with a plurality of installation grooves arranged at intervals along its extension direction, the two ends of the installation grooves respectively extend to the first straight line segment and the second straight line segment, and the magnetic conductive blocks are placed in the installation grooves; and
[0016] Two rotors, the two rotors are respectively arranged at the first straight segment and the second straight segment, the rotors include a rotor magnetic conductive shell, an even number of rotor permanent magnets and a rotor bearing, wherein the rotor magnetic conductive shell has a cylindrical rotating surface, the rotor permanent magnets are installed on the rotating surface of the rotor magnetic conductive shell, the rotor permanent magnets extend along the axial direction of the rotating surface and are arranged at intervals, and the N\S magnetic poles of two adjacent rotor permanent magnets are arranged alternately, an air gap is formed between the rotor permanent magnets and the magnetic conductive blocks, and the inner ring and the outer ring of the rotor bearing are respectively fixedly connected to the magnetic field modulation ring and the rotor magnetic conductive shell;
[0017] The number of the magnetic blocks is M3. In the two rotors, the number of the input-end rotor permanent magnets is 2M1, the number of the output-end rotor permanent magnets is 2M2, and the number of the magnetic blocks M3 satisfies M3=M1+M2 or M3=M1-M2.
[0018] Preferably, a plurality of separation protrusions are provided on the rotating surface of the magnetic shell, the separation protrusions extend radially with the axis of the rotating surface as the center, and a fan-shaped groove is formed between two adjacent separation protrusions, and the rotor permanent magnet is arranged in the groove.
[0019] Preferably, a limiting structure for limiting the axial movement of the rotor permanent magnet along the rotating surface is provided in the groove.
[0020] The beneficial effects of using the present invention are:
[0021] The present invention rotates a rotor on a magnetic field modulation ring, so that the magnetic field generated by the rotor is transmitted to another rotor through the magnetic field modulation ring, thereby driving the other rotor to rotate, realizing non-contact transmission of power and forming a magnetic reducer. The present invention utilizes the characteristic of the magnetic field as a closed field to realize the load's demand for low speed and high torque. The device has high torque density, and the permanent magnet right-angle reducer can be applied in the working condition where the drive system and the load roller are placed vertically, overcoming the use limitations of traditional permanent magnet reducers. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the appearance of the permanent magnet right-angle reducer of the present invention.
[0023] Figure 2 This is a structural diagram of the permanent magnet right-angle reducer of the present invention.
[0024] Figure 3 for Figure 2 Cross-sectional view along the AA direction.
[0025] Figure 4 for Figure 2 Cross-sectional view along the BB direction.
[0026] Reference numerals include:
[0027] 1- high speed end rotor; 2- magnetic field modulation ring; 3- low speed end rotor;
[0028] 11-high-speed end rotor magnetic conductive shell; 12-high-speed end rotor permanent magnet; 13-high-speed end rotor permanent magnet cover; 14-high-speed end rotor bearing; 15-high-speed end rotor pressure cover;
[0029] 21-magnetic conductive block; 22-non-metallic isolation sleeve;
[0030] 31- low speed end rotor magnetic conductive shell; 32- low speed end rotor permanent magnet; 33- low speed end rotor permanent magnet cover; 34- low speed end rotor bearing; 35- low speed end rotor pressure cover. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the technical solution more clear, the technical solution is further described in detail below in conjunction with specific implementation methods. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the technical solution.
[0032] like Figure 1-Figure 4 As shown, the permanent magnet right-angle reducer proposed in this embodiment includes
[0033] A magnetic field modulation ring 2, wherein the magnetic field modulation ring 2 is an "L"-shaped structure, and comprises a first straight line segment, a second straight line segment perpendicular to the first straight line segment, and a connecting segment connecting the first straight line segment and the second straight line segment; the magnetic field modulation ring 2 comprises a non-metallic isolation sleeve 22 and a plurality of magnetic conductive blocks 21, the non-metallic isolation sleeve 22 is provided with a plurality of installation grooves arranged at intervals along its extension direction, the two ends of the installation grooves respectively extend to the first straight line segment and the second straight line segment, and the magnetic conductive blocks 21 are placed in the installation grooves; and
[0034] The two rotors are respectively arranged at the first straight segment and the second straight segment, and the rotor includes a rotor magnetic conductive shell, an even number of rotor permanent magnets and a rotor bearing, wherein the rotor magnetic conductive shell has a cylindrical rotating surface, the rotor permanent magnets are installed on the rotating surface of the rotor magnetic conductive shell, the rotor permanent magnets extend along the axial direction of the rotating surface and are arranged at intervals, and the N\S magnetic poles of two adjacent rotor permanent magnets are arranged alternately, an air gap is formed between the rotor permanent magnets and the magnetic conductive block 21, and the inner ring and the outer ring of the rotor bearing are fixedly connected to the magnetic field modulation ring 2 and the rotor magnetic conductive shell respectively;
[0035] The number of the magnetic blocks 21 is M3. In the two rotors, the number of the input-end rotor permanent magnets is 2M1, the number of the output-end rotor permanent magnets is 2M2, and the number M3 of the magnetic blocks 21 satisfies M3=M1+M2 or M3=M1-M2.
[0036] A plurality of separation protrusions are arranged on the rotating surface of the magnetic shell. The separation protrusions extend radially with the axis of the rotating surface as the center, and a sector-shaped groove is formed between two adjacent separation protrusions. The rotor permanent magnet is arranged in the groove.
[0037] A limiting structure for limiting the axial movement of the rotor permanent magnet along the rotating surface is arranged in the groove.
[0038] Example 1
[0039] In this embodiment, the rotors are respectively a high-speed end rotor 1 and a low-speed end rotor 3, and both the high-speed end rotor 1 and the low-speed end rotor 3 are mounted outside the magnetic field modulation ring 2. In other embodiments, the magnetic field modulation ring 2 has a cavity inside, and the high-speed end rotor 1 and the low-speed end rotor 3 can also be inserted into the magnetic field modulation ring 2, or can be respectively mounted outside the magnetic field modulation ring 2 or inserted into the magnetic field modulation ring 2. The arrangement of the high-speed end rotor 1 and the low-speed end rotor 3 forms 4 forms.
[0040] The high-speed end rotor 1 and the low-speed end rotor 3 are installed with evenly distributed permanent magnets, the high-speed end rotor 1 and the low-speed end rotor 3 are arranged vertically, and the main body of the magnetic field modulation ring 2 is magnetic conductive steel and is L-shaped. When the permanent magnet right-angle reducer is running, the high-speed end rotor 1 rotates at high speed, the magnetic field modulation ring 2 is fixed, and the low-speed end rotor 3 rotates at low speed. The speed multiple between the high-speed end rotor 1 and the low-speed end rotor 3 is the torque multiplication multiple of the reducer.
[0041] like Figure 2 As shown, the high-speed end rotor 1 comprises a high-speed end rotor magnetic conductive shell 11, a high-speed end rotor permanent magnet 12, a high-speed end rotor permanent magnet cover 13, a high-speed end rotor bearing 14 and a high-speed end rotor pressure cover 15. Figure 3 As shown, the high-speed end rotor magnetic conductive shell 11 is annular, and there are 2M1 permanent magnet placement grooves evenly distributed inside the high-speed end rotor magnetic conductive shell 11; the high-speed end rotor permanent magnets 12 are placed in the grooves and arranged alternately according to different N\S magnetic poles.
[0042] like Figure 4 As shown, the low-speed end rotor 3 includes a low-speed end rotor magnetic conductive shell 31, a low-speed end rotor permanent magnet 32, a low-speed end rotor permanent magnet cover 33, a low-speed end rotor bearing 34, and a low-speed end rotor pressure cover 35. Figure 4 As shown, the low-speed rotor magnetic conductive shell 31 is annular, and has 2M2 permanent magnet placement grooves evenly distributed inside the low-speed rotor magnetic conductive shell 31; the low-speed rotor permanent magnets 32 are placed in the grooves and arranged alternately according to different N / S magnetic poles.
[0043] The magnetic field modulation ring 2 includes a non-metallic isolation sleeve 22 and a magnetic conductive block 21. The magnetic conductive block 21 is L-shaped. There are (M2-M1) or (M2+M1) magnetic conductive blocks 21 in total. The number M3 of the magnetic conductive blocks 21 will affect the reduction ratio of the permanent magnet right-angle reducer and the rotation direction of the low-speed end rotor 3. When the number M3 of the magnetic conductive blocks 21 = M2-M1, the rotation direction of the high-speed end rotor 1 from the drive side is opposite to the rotation direction of the low-speed end rotor 3 from the load side; when the number M3 of the magnetic conductive blocks 21 = M2+M1, the rotation direction of the high-speed end rotor 1 from the drive side is the same as the rotation direction of the low-speed end rotor 3 from the load side.
[0044] During use, the drive system drives the high-speed end rotor 1 to rotate, and the high-speed end rotor 1 drives the high-speed rotor permanent magnet 12 to rotate to generate a rotating magnetic field. The rotating magnetic field is coupled with the magnetic field of the low-speed end rotor permanent magnet 32 through the magnetic conductive block 21 in the magnetic field modulation ring 2 to achieve torque transmission. The speed ratio of the high-speed end rotor 1 and the low-speed end rotor 3 is M2 / M1, and the torque ratio of the high-speed end rotor 1 and the low-speed end rotor 3 is M1 / M2, which realizes the energy transfer from high-speed small torque to low-speed large torque. Since the magnetic field modulation ring 2 is L-shaped, the permanent magnet right-angle reducer can still be well applied in the working condition where the drive system is placed vertically to the load roller.
[0045] like Figure 2 As shown, the high-speed end rotor permanent magnet cover 13 is installed in the high-speed end rotor magnetic conductive shell 11 to prevent the high-speed end rotor permanent magnet 12 from axial movement; the high-speed end rotor bearing 14 is arranged between the magnetic field modulation ring 2 and the high-speed end rotor 1 to support and separate the moving and static parts. In this embodiment, the static part is the magnetic field modulation ring 2 and the inner ring of the high-speed end rotor bearing 14. Similarly, there is also the inner ring of the low-speed end rotor bearing 34, and the rest are moving parts; the high-speed end rotor pressure cover 15 is installed between the high-speed end rotor magnetic conductive shell 11 and the high-speed end rotor bearing 14 to seal and support the high-speed end rotor 1. Similarly, the low-speed end rotor permanent magnet cover 33 is installed in the low-speed end rotor magnetic conductive shell 31 to prevent the low-speed end rotor permanent magnet 32 from axial movement; the low-speed end rotor bearing 34 is arranged between the magnetic field modulation ring 2 and the low-speed end rotor 3 to support and separate the moving and static parts; the low-speed end rotor pressure cover 35 is installed between the low-speed end rotor magnetic conductive shell 31 and the low-speed end rotor bearing 34 to seal and support the low-speed end rotor 3.
[0046] The radius of curvature at the bending point of each magnetic conductive block 21 is different. All the magnetic conductive blocks together form an L-shaped cylindrical magnetic field modulation ring 2, which is fixed by a non-metallic isolation sleeve 22. The magnetic field modulation ring 2 is arranged between the high-speed end rotor 1 and the low-speed end rotor 3. The high-speed end rotor 1 and the low-speed end rotor 3 are respectively arranged on the magnetic field modulation ring 2 through the high-speed end rotor bearing 14 and the low-speed end rotor bearing 34.
[0047] like Figure 3 As shown, the high-speed end rotor magnetic conductive shell 11 has evenly distributed grooves inside, and the high-speed end rotor permanent magnets 12 are installed in the grooves. There is an air gap between the high-speed end rotor permanent magnets 12 and the non-metallic isolation sleeve 22, and the two are not in contact, and the relative position is maintained by the high-speed end rotor bearing 14. The magnetic conductive blocks 21 are evenly distributed in the non-metallic isolation sleeve 22, and the relative position is maintained by the non-metallic isolation sleeve 22.
[0048] Similar, such as Figure 4As shown, the low-speed end rotor magnetic conductive shell 31 has evenly distributed grooves inside, and the low-speed end rotor permanent magnets 32 are installed in the grooves. There is an air gap between the low-speed end rotor permanent magnets 32 and the non-metallic isolation sleeve 22, and the two are not in contact, and the relative position is maintained by the low-speed end rotor bearing 34. The magnetic conductive blocks 21 are evenly distributed in the non-metallic isolation sleeve 22 and are maintained in relative position by the non-metallic isolation sleeve 22.
[0049] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present technical content. As long as these changes do not deviate from the concept of the present invention, they all fall within the scope of protection of this patent.
Claims
1. A permanent magnet right angle reducer, Features: include A magnetic field modulation ring, wherein the magnetic field modulation ring is an "L"-shaped structure, comprising a first straight line segment, a second straight line segment perpendicular to the first straight line segment, and a connecting segment connecting the first straight line segment and the second straight line segment; the magnetic field modulation ring comprises a non-metallic isolation sleeve and a plurality of magnetic conductive blocks, the non-metallic isolation sleeve is provided with a plurality of installation grooves arranged at intervals along its extension direction, the two ends of the installation grooves respectively extend to the first straight line segment and the second straight line segment, and the magnetic conductive blocks are placed in the installation grooves; and Two rotors, the two rotors are respectively arranged at the first straight segment and the second straight segment, the rotors include a rotor magnetic conductive shell, an even number of rotor permanent magnets and a rotor bearing, wherein the rotor magnetic conductive shell has a cylindrical rotating surface, the rotor permanent magnets are installed on the rotating surface of the rotor magnetic conductive shell, the rotor permanent magnets extend along the axial direction of the rotating surface and are arranged at intervals, and the N\S magnetic poles of two adjacent rotor permanent magnets are arranged alternately, an air gap is formed between the rotor permanent magnets and the magnetic conductive blocks, and the inner ring and the outer ring of the rotor bearing are respectively fixedly connected to the magnetic field modulation ring and the rotor magnetic conductive shell; The number of the magnetic blocks is M 3 , in the two rotors, the number of permanent magnets at the input end of the rotor is 2M 1 , the number of permanent magnets on the output rotor is 2M 2 , the number of magnetic blocks M 3 Meet M 3 =M 1 +M 2 or M 3 =M 1 -M 2 .
2. The permanent magnet right angle reducer according to claim 1, Features: A plurality of separation protrusions are arranged on the rotating surface of the magnetic shell, and the separation protrusions extend radially with the axis of the rotating surface as the center, and a sector-shaped groove is formed between two adjacent separation protrusions, and the rotor permanent magnet is arranged in the groove.
3. The permanent magnet right angle reducer according to claim 2, Features: A limiting structure for limiting the axial movement of the rotor permanent magnet along the rotating surface is arranged in the groove.