A magnetic field modulation type magnetic gear

Abstract

The present invention discloses a magnetic field modulation type magnetic gear, which includes an inner rotor unit, a stator unit and an outer rotor unit. Among them, the inner rotor unit includes an inner rotor frame, inner rotor radial permanent magnets and inner rotor axial permanent magnets; the stator unit includes stator radial magnetic field adjusting iron blocks and stator axial magnetic field adjusting iron blocks; the outer rotor unit includes an outer rotor frame, outer rotor radial permanent magnets and outer rotor axial permanent magnets. The rotating inner rotor axial permanent magnets and inner rotor radial permanent magnets generate two mutually isolated changing magnetic fields. The magnetic field generated by the inner rotor radial permanent magnets is magnetically concentrated to the radial end face of the outer rotor frame after being modulated by the stator radial magnetic field adjusting iron blocks, and the magnetic field generated by the inner rotor axial permanent magnets is magnetically concentrated to the circumferential inner side wall of the outer rotor frame after being modulated by the stator axial magnetic field adjusting iron blocks. The two changing magnetic fields magnetically concentrated on the outer rotor frame drive the outer rotor radial permanent magnets and outer rotor axial permanent magnets to rotate through magnetic force, so as to realize the transmission of torque.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic gears, and particularly to a magnetic field modulation type magnetic gear. Background Art

[0002] A magnetic gear (MG) transmits torque and energy through magnetic field coupling, and can effectively solve the problems existing in mechanical gears. Compared with mechanical gears, magnetic gears have the following advantages: (1) Non-contact transmission, with no friction, low noise and weak vibration; (2) No lubrication required, no oil contamination, and less maintenance; (3) Capable of transmitting torque and power to a sealed space; (4) The torque peak is determined, and it has the ability of automatic overload protection; (5) Simple structure, easy to process and manufacture.

[0003] In recent years, the torque density of magnetic gears with novel topological structures has been greatly improved, and they are fully capable of replacing traditional mechanical gears. The novel direct drive devices composed of magnetic gears and motors provide new ideas and new options for electric vehicles, wind power, hydropower and ship propulsion systems. The research on magnetic gears is not only related to traditional mechanical disciplines, but also closely related to magnetic field disciplines and heat transfer disciplines, creating new research directions and bringing new knowledge growth points. Therefore, the research on magnetic gears has important theoretical significance and practical value.

[0004] Chinese Patent with Publication No. CN102299610A proposes an outer rotor type reluctance permanent magnet gear, which uses the principle of reluctance motor to change the magnetic reluctance of the magnetic circuit during the transmission of the magnetic gear, so as to drive the inner rotor to rotate at a certain transmission ratio. And according to the magnet arrangement in the invention, a larger transmission ratio can be achieved, but the transmitted torque has not been improved, and the utilization rate of the magnetic field has not been increased either.

[0005] Therefore, how to improve the transmitted torque of magnetic gears in the existing technology has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a magnetic field modulation type magnetic gear to solve the problems existing in the above-mentioned prior art and improve the transmitted torque of the magnetic gear.

[0007] To achieve the above purpose, the present invention provides the following solution: The present invention provides a magnetic field modulation type magnetic gear, including:

[0008] An inner rotor unit, the inner rotor unit includes an inner rotor frame, inner rotor radial permanent magnets and inner rotor axial permanent magnets. The inner rotor radial permanent magnets and the inner rotor axial permanent magnets are respectively detachably connected to the inner rotor frame. The inner rotor radial permanent magnets and the inner rotor axial permanent magnets can each form at least one pair of magnetic pole pairs. The inner rotor frame is made of a magnetic isolation material;

[0009] A stator unit, the stator unit includes a stator frame, a stator radially adjustable magnet block, and a stator axially adjustable magnet block, and the stator radially adjustable magnet block and the stator axially adjustable magnet block are respectively detachably connected to the stator frame;

[0010] An outer rotor unit, the outer rotor unit includes an outer rotor frame, an outer rotor radially permanent magnet, and an outer rotor axially permanent magnet, the outer rotor radially permanent magnet and the outer rotor axially permanent magnet are respectively detachably connected to the outer rotor frame, and both the outer rotor radially permanent magnet and the outer rotor axially permanent magnet can respectively form at least one pair of magnetic pole pairs;

[0011] The stator unit is sleeved outside the inner rotor unit and there is a gap between them, the outer rotor unit is sleeved outside the inner rotor unit and there is a gap between them, the stator radially adjustable magnet block is located between the inner rotor radially permanent magnet and the outer rotor radially permanent magnet, and the stator axially adjustable magnet block is located between the inner rotor axially permanent magnet and the outer rotor axially permanent magnet.

[0012] Preferably, the number of magnetic pole pairs of the inner rotor radially permanent magnet is P i , the number of the stator radially adjustable magnet blocks is P s , the number of magnetic pole pairs of the outer rotor radially permanent magnet is P o , then: P o = P s - P i ;

[0013] Correspondingly, the number of magnetic pole pairs of the inner rotor axially permanent magnet is P i1 , the number of the stator axially adjustable magnet blocks is P s1 , the number of magnetic pole pairs of the outer rotor axially permanent magnet is P o1 , then: P o1 = P s1 - P i1 .

[0014] Preferably, the inner rotor frame is a stepped structure, a radially larger end surface of the inner rotor frame facing the stator unit has a mounting pit, the inner rotor radially permanent magnet is arranged in the mounting pit, and the inner rotor radially permanent magnet is connected to the mounting pit in a plug-in manner; a slot is arranged on the outer peripheral surface of the inner rotor frame extending into the stator unit, the slot is arranged parallel to the axis of the inner rotor frame, a circumferential stop block is arranged in the slot, the circumferential stop block is connected to the slot in a plug-in manner, the inner rotor axially permanent magnet is arranged between two adjacent circumferential stop blocks, and the circumferential stop block is made of a magnetic isolation material.

[0015] Preferably, the inner rotor unit further includes an inner rotor end cover which is disposed at one end of the inner rotor axial permanent magnet away from the inner rotor radial permanent magnet. The inner rotor end cover abuts against the inner rotor axial permanent magnet and is detachably connected to the inner rotor frame. Positioning pins are provided between the inner rotor frame and the inner rotor radial permanent magnet and between the inner rotor axial permanent magnet and the inner rotor end cover.

[0016] Preferably, the stator frame is a stepped structure. A mounting block is provided on the radial end face with a larger diameter at one end of the stator frame facing the outer rotor unit. The stator radial adjusting magnet block is inserted and connected to the mounting block. The stator radial adjusting magnet block is disposed between two adjacent mounting blocks and is arranged opposite to the inner rotor radial permanent magnet. The stator frame is further provided with mounting rods which are circumferentially and evenly distributed along the axis of the stator frame. The stator axial adjusting magnet block is inserted and connected to the mounting rods. The stator axial adjusting magnet block is disposed between two adjacent mounting rods and is arranged opposite to the inner rotor axial permanent magnet.

[0017] Preferably, the mounting block has a first guiding block. The axial cross-section of the first guiding block is rectangular. The stator radial adjusting magnet block has a first guiding groove adapted to the first guiding block. The first guiding block is slidably connected to the first guiding groove. The mounting rod has a second guiding block which has an arc-shaped structure facing the stator axial adjusting magnet block. The stator axial adjusting magnet block has a second guiding groove adapted to the second guiding block. The second guiding block is slidably connected to the second guiding groove.

[0018] Preferably, the stator unit further includes a stator end cover which is inserted and connected to the mounting rods. A fixing pin is provided at one end of the mounting rod passing through the stator end cover. The fixing pin is inserted and connected to the mounting rod. The axis of the fixing pin is perpendicular to the insertion direction of the mounting rod and the stator end cover.

[0019] Preferably, the outer rotor frame is a hollow cylindrical structure. A mounting groove is provided on the radial end face at one end of the outer rotor frame facing the stator unit. The outer rotor radial permanent magnet is disposed in the mounting groove and is arranged opposite to the stator radial adjusting magnet block. Connecting blocks are provided on the inner circumferential surface of the outer rotor frame. The outer rotor axial permanent magnet is inserted and connected to the connecting blocks and is arranged opposite to the stator axial adjusting magnet block.

[0020] Preferably, the outer rotor unit further includes a positioning sleeve and an outer rotor end cover. The outer rotor frame is sleeved outside the positioning sleeve. The positioning sleeve is arranged at one end of the outer rotor axial permanent magnet away from the stator unit. The positioning sleeve abuts against the outer rotor axial permanent magnet. The outer rotor end cover is detachably connected to the outer rotor frame and abuts against the positioning sleeve. The radial cross-section of the connecting block is trapezoidal.

[0021] Preferably, the number of pole pairs of the inner rotor radial permanent magnet, the inner rotor axial permanent magnet, the outer rotor radial permanent magnet, and the outer rotor axial permanent magnet is multiple pairs, and the inner rotor radial permanent magnet, the inner rotor axial permanent magnet, the outer rotor radial permanent magnet, and the outer rotor axial permanent magnet are all Halbach arrays.

[0022] The present invention has achieved the following technical effects compared with the prior art: The magnetic field modulation type magnetic gear of the present invention includes an inner rotor unit, a stator unit, and an outer rotor unit. Among them, the inner rotor unit includes an inner rotor frame, an inner rotor radial permanent magnet, and an inner rotor axial permanent magnet. The inner rotor radial permanent magnet and the inner rotor axial permanent magnet are respectively detachably connected to the inner rotor frame. The inner rotor radial permanent magnet and the inner rotor axial permanent magnet can each form at least one pair of pole pairs. The inner rotor frame is made of a magnetic isolation material. The stator unit includes a stator frame, a stator radial magnetic modulation block, and a stator axial magnetic modulation block. The stator radial magnetic modulation block and the stator axial magnetic modulation block are respectively detachably connected to the stator frame. The outer rotor unit includes an outer rotor frame, an outer rotor radial permanent magnet, and an outer rotor axial permanent magnet. The outer rotor radial permanent magnet and the outer rotor axial permanent magnet are respectively detachably connected to the outer rotor frame. The outer rotor radial permanent magnet and the outer rotor axial permanent magnet can each form at least one pair of pole pairs. The stator unit is sleeved outside the inner rotor unit with a gap therebetween, and the outer rotor unit is sleeved outside the inner rotor unit with a gap therebetween. The stator radial magnetic modulation block is located between the inner rotor radial permanent magnet and the outer rotor radial permanent magnet, and the stator axial magnetic modulation block is located between the inner rotor axial permanent magnet and the outer rotor axial permanent magnet.

[0023] The magnetic field modulation type magnetic gear of the present invention has an inner rotor unit that can be connected to the input shaft and an outer rotor unit that can be connected to the output shaft. The input shaft drives the inner rotor unit to rotate. The rotating inner rotor axial permanent magnet and inner rotor radial permanent magnet generate two mutually isolated changing magnetic fields. The inner rotor frame is made of a magnetic isolation material to isolate the two magnetic fields and prevent interference between them. The magnetic field generated by the inner rotor radial permanent magnet is magnetically concentrated to the radial end face of the outer rotor frame after being modulated by the stator radial magnetic modulation block. The magnetic field generated by the inner rotor axial permanent magnet is magnetically concentrated to the circumferential inner side wall of the outer rotor frame after being modulated by the stator axial magnetic modulation block. The two changing magnetic fields magnetically concentrated on the outer rotor frame interact with the magnetic fields generated by the outer rotor radial permanent magnet and the outer rotor axial permanent magnet respectively to generate magnetic forces, which drive the outer rotor radial permanent magnet and the outer rotor axial permanent magnet to rotate. The outer rotor radial permanent magnet and the outer rotor axial permanent magnet drive the outer rotor frame to rotate to achieve torque transmission. The present invention utilizes the parallel connection of the axial permanent magnet and the radial permanent magnet to improve the magnetic field utilization rate and the transmitted torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 is a schematic structural diagram of the magnetic field modulation type magnetic gear of the present invention;

[0026] Figure 2 is a schematic structural diagram of the magnetic field modulation type magnetic gear of the present invention from other angles;

[0027] Figure 3 is a schematic end face diagram of the magnetic field modulation type magnetic gear of the present invention;

[0028] Figure 4 is Figure 3 a schematic sectional structure diagram along the A-A direction in

[0029] Figure 5 is a schematic disassembled structure diagram of the inner rotor unit of the magnetic field modulation type magnetic gear of the present invention;

[0030] Figure 6 is a schematic structural diagram of the stator unit of the magnetic field modulation type magnetic gear of the present invention;

[0031] Figure 7 is a schematic disassembled structure diagram of the stator unit of the magnetic field modulation type magnetic gear of the present invention;

[0032] Figure 8 Partial structural schematic diagram of the outer rotor unit of the magnetic field modulation type magnetic gear of the present invention;

[0033] Figure 9 Structural schematic diagram of the outer rotor unit of the magnetic field modulation type magnetic gear of the present invention from other angles;

[0034] Figure 10 Disassembly structural schematic diagram of the magnetic field modulation type magnetic gear of the present invention;

[0035] Figure 11 Magnetic field layout diagram of the inner rotor unit of the magnetic field modulation type magnetic gear of the present invention;

[0036] Figure 12 Radial magnetic field layout diagram of the outer rotor unit of the magnetic field modulation type magnetic gear of the present invention;

[0037] Figure 13 Axial magnetic field layout diagram of the outer rotor unit of the magnetic field modulation type magnetic gear of the present invention.

[0038] Among them, 100a is a magnetic field modulation type magnetic gear;

[0039] 100 is the inner rotor unit, 200 is the stator unit, and 300 is the outer rotor unit;

[0040] 1 is the inner rotor frame, 101 is the installation pit, 102 is the slot, 2 is the inner rotor radial permanent magnet, 3 is the inner rotor axial permanent magnet, 4 is the stator frame, 401 is the installation block, 402 is the installation rod, 403 is the first guide block, 404 is the second guide block, 5 is the stator radial magnetic adjustment block, 501 is the first guide groove, 6 is the stator axial magnetic adjustment block, 601 is the second guide groove, 7 is the outer rotor frame, 701 is the installation groove, 702 is the connection block, 8 is the outer rotor radial permanent magnet, 9 is the outer rotor axial permanent magnet, 10 is the circumferential stop block, 11 is the inner rotor end cover, 12 is the positioning pin, 13 is the stator end cover, 14 is the fixing pin, 15 is the positioning sleeve, and 16 is the outer rotor end cover. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] The purpose of the present invention is to provide a magnetic field modulation type magnetic gear to solve the problems existing in the above-mentioned prior art and improve the transmission torque of the magnetic gear.

[0043] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Please refer to Figure 1-13 , wherein Figure 1 Figure 1 is a schematic structural diagram of the magnetic field modulation type magnetic gear of the present invention, Figure 2 is a schematic structural diagram of the magnetic field modulation type magnetic gear of the present invention from other angles, Figure 3 is an end view schematic diagram of the magnetic field modulation type magnetic gear of the present invention, Figure 4 is Figure 3 a schematic sectional structure diagram along the A-A direction in Figure 5 is a disassembled structural diagram of the inner rotor unit of the magnetic field modulation type magnetic gear of the present invention, Figure 6 is a schematic structural diagram of the stator unit of the magnetic field modulation type magnetic gear of the present invention, Figure 7 is a disassembled structural diagram of the stator unit of the magnetic field modulation type magnetic gear of the present invention, Figure 8 is a partial schematic structural diagram of the outer rotor unit of the magnetic field modulation type magnetic gear of the present invention, Figure 9 is a schematic structural diagram of the outer rotor unit of the magnetic field modulation type magnetic gear of the present invention from other angles, Figure 10 is a disassembled structural diagram of the magnetic field modulation type magnetic gear of the present invention, Figure 11 is a magnetic field layout diagram of the inner rotor unit of the magnetic field modulation type magnetic gear of the present invention, Figure 12 is a radial magnetic field layout diagram of the outer rotor unit of the magnetic field modulation type magnetic gear of the present invention, Figure 13 is an axial magnetic field layout diagram of the outer rotor unit of the magnetic field modulation type magnetic gear of the present invention.

[0045] The present invention provides a magnetic field modulation type magnetic gear 100a, which includes an inner rotor unit 100, a stator unit 200, and an outer rotor unit 300. Among them, the inner rotor unit 100 includes an inner rotor frame 1, inner rotor radial permanent magnets 2, and inner rotor axial permanent magnets 3. The inner rotor radial permanent magnets 2 and the inner rotor axial permanent magnets 3 are respectively detachably connected to the inner rotor frame 1. The inner rotor radial permanent magnets 2 and the inner rotor axial permanent magnets 3 can each form at least one pair of magnetic pole pairs. The inner rotor frame 1 is made of a magnetic isolation material; the stator unit 200 includes a stator frame 4, stator radial magnetic field modulation blocks 5, and stator axial magnetic field modulation blocks 6. The stator radial magnetic field modulation blocks 5 and the stator axial magnetic field modulation blocks 6 are respectively detachably connected to the stator frame 4; the outer rotor unit 300 includes an outer rotor frame 7, outer rotor radial permanent magnets 8, and outer rotor axial permanent magnets 9. The outer rotor radial permanent magnets 8 and the outer rotor axial permanent magnets 9 are respectively detachably connected to the outer rotor frame 7. The outer rotor radial permanent magnets 8 and the outer rotor axial permanent magnets 9 can each form at least one pair of magnetic pole pairs; the stator unit 200 is sleeved outside the inner rotor unit 100 and there is a gap between them. The outer rotor unit 300 is sleeved outside the inner rotor unit 100 and there is a gap between them. The stator radial magnetic field modulation blocks 5 are located between the inner rotor radial permanent magnets 2 and the outer rotor radial permanent magnets 8. The stator axial magnetic field modulation blocks 6 are located between the inner rotor axial permanent magnets 3 and the outer rotor axial permanent magnets 9.

[0046] In the magnetic field modulation type magnetic gear 100a of the present invention, the inner rotor unit 100 can be connected to an input shaft, and the outer rotor unit 300 can be connected to an output shaft. The input shaft drives the inner rotor unit 100 to rotate. The rotating inner rotor axial permanent magnets 3 and inner rotor radial permanent magnets 2 generate two mutually isolated changing magnetic fields. The inner rotor frame 1 is made of a magnetic isolation material to isolate the two magnetic fields and prevent the two magnetic fields from interfering with each other; the magnetic field generated by the inner rotor radial permanent magnets 2 is magnetically concentrated on the radial end face of the outer rotor frame 7 after being modulated by the stator radial magnetic field modulation blocks 5. The magnetic field generated by the inner rotor axial permanent magnets 3 is magnetically concentrated on the circumferential inner side wall of the outer rotor frame 7 after being modulated by the stator axial magnetic field modulation blocks 6. The two changing magnetic fields magnetically concentrated on the outer rotor frame 7 respectively interact with the magnetic fields generated by the outer rotor radial permanent magnets 8 and the outer rotor axial permanent magnets 9 to generate magnetic forces, which drive the outer rotor radial permanent magnets 8 and the outer rotor axial permanent magnets 9 to rotate through the magnetic forces. The outer rotor radial permanent magnets 8 and the outer rotor axial permanent magnets 9 drive the outer rotor frame 7 to rotate to achieve torque transmission. The present invention utilizes the parallel connection of axial permanent magnets and radial permanent magnets to improve the magnetic field utilization rate and the transmitted torque.

[0047] It should be noted here that the sum of the number of pole pairs of the inner-rotor radial permanent magnets 2 and the number of pole pairs of the outer-rotor radial permanent magnets 8 is equal to the number of pole pairs of the stator radial adjusting magnet blocks 5. Similarly, the sum of the number of pole pairs of the inner-rotor axial permanent magnets 3 and the number of pole pairs of the outer-rotor axial permanent magnets 9 is equal to the number of pole pairs of the stator axial adjusting magnet blocks 6 to ensure the normal operation of the magnetic gear. This belongs to the common knowledge of those skilled in the art and will not be elaborated here.

[0048] In this specific embodiment, the number of both the inner-rotor radial permanent magnets 2 and the inner-rotor axial permanent magnets 3 is 8, the number of both the outer-rotor radial permanent magnets 8 and the outer-rotor axial permanent magnets 9 is 20, the number of both the stator radial adjusting magnet blocks 5 and the stator axial adjusting magnet blocks 6 is 7, and the number of pole pairs of the inner-rotor radial permanent magnets 2 is P i , and the number of the stator radial adjusting magnet blocks 5 is P s , and the number of pole pairs of the outer-rotor radial permanent magnets 8 is P o , then: P o = P s - P i ;

[0049] To maximize the transmitted torque, the relationship between the number of pole pairs and the angular velocity should be as follows:

[0050]

[0051] where ω i , ω O and ω s respectively represent the angular velocities of the inner-rotor unit 100, the outer-rotor unit 300, and the stator unit 200. Since the stator unit 200 remains stationary, the relationship between the angular velocity and the number of pole pairs is:

[0052]

[0053] P o , P s and P i The best combination is to minimize the torque ripple. Such ripple is mainly caused by the cogging torque, which is generated by the interaction between the magnetic fields of the inner and outer rotor permanent magnets and the magnetic field of the stator adjusting magnet blocks. The parameter that minimizes the cogging torque is called the cogging factor. It is expressed by the following equation:

[0054]

[0055] where LCM refers to the least common multiple. When C f = 1, the cogging torque is minimized. Therefore, in this embodiment, the configuration of P i = 2, P s = 7, P o = 5 is adopted to satisfy Po = P s -P i and C f = 1.

[0056] Accordingly, the number of pole pairs of the inner rotor axial permanent magnet 3 is P i1 , the number of stator axial adjusting magnet blocks 6 is P s1 , the number of pole pairs of the outer rotor axial permanent magnet 9 is P o1 , then: P o1 = P s1 -P i1 .

[0057] Specifically, the inner rotor frame 1 is of a stepped structure. On the radial end face with a larger diameter at one end of the inner rotor frame 1 facing the stator unit 200, there is an installation pit 101. The inner rotor radial permanent magnet 2 is arranged in the installation pit 101, and the inner rotor radial permanent magnet 2 is inserted and connected with the installation pit 101; on the outer peripheral surface of the inner rotor frame 1 extending into the stator unit 200, there is a slot 102. The slot 102 is arranged parallel to the axis of the inner rotor frame 1. A circumferential stop 10 is arranged in the slot 102, and the circumferential stop 10 is inserted and connected with the slot 102. The inner rotor axial permanent magnet 3 is arranged between two adjacent circumferential stops 10, and the circumferential stop 10 is made of a magnetic isolation material. In this specific embodiment, the installation pit 101 is arc-shaped, and the radius of the radial inner side surface of the inner rotor radial permanent magnet 2 is greater than the radius of the radial inner side surface of the installation pit 101 to ensure the smooth installation of the inner rotor radial permanent magnet 2; at the same time, a slot 102 is arranged on the outer peripheral surface of the inner rotor frame 1 to facilitate the installation of the circumferential stop 10. The inner rotor axial permanent magnet 3 is arranged between adjacent circumferential stops 10, and the circumferential stop 10 is used to position and install the inner rotor axial permanent magnet 3, which is convenient for disassembly operation.

[0058] In addition, the inner rotor unit 100 further includes an inner rotor end cover 11. The inner rotor end cover 11 is arranged at one end of the inner rotor axial permanent magnet 3 away from the inner rotor radial permanent magnet 2. The inner rotor end cover 11 abuts against the inner rotor axial permanent magnet 3, and the inner rotor end cover 11 is detachably connected to the inner rotor frame 1. The setting of the inner rotor end cover 11 effectively prevents the inner rotor axial permanent magnet 3 from axially sliding, improving the structural stability of the inner rotor unit 100. In practical applications, the inner rotor frame 1 and the inner rotor end cover 11 can adopt a bolt connection method, which is firmly connected and convenient for disassembly and assembly. Positioning pins 12 are arranged between the inner rotor frame 1 and the inner rotor radial permanent magnet 2 and between the inner rotor axial permanent magnet 3 and the inner rotor end cover 11, further improving the working reliability of the inner rotor unit 100, effectively avoiding the positioning accuracy of the inner rotor radial permanent magnet 2 and the inner rotor axial permanent magnet 3, and preventing misalignment during the working process. In other specific embodiments of the present invention, the positioning pin 12 can adopt a tapered pin to improve the fixing strength and facilitate the installation operation.

[0059] More specifically, the stator frame 4 has a stepped structure. The radial end face with a larger diameter at one end of the stator frame 4 facing the outer rotor unit 300 has mounting blocks 401. The stator radial adjusting magnet blocks 5 are inserted and connected to the mounting blocks 401. The stator radial adjusting magnet blocks 5 are arranged between two adjacent mounting blocks 401, which facilitates the installation operation and at the same time prevents the stator frame 4 from affecting the normal operation of the stator radial adjusting magnet blocks 5. The stator radial adjusting magnet blocks 5 are arranged opposite to the inner rotor radial permanent magnets 2. The stator frame 4 is also provided with mounting rods 402. The mounting rods 402 are circumferentially distributed along the axis of the stator frame 4. The stator axial adjusting magnet blocks 6 are inserted and connected to the mounting rods 402. The stator axial adjusting magnet blocks 6 are arranged between two adjacent mounting rods 402. The stator axial adjusting magnet blocks 6 are arranged opposite to the inner rotor axial permanent magnets 3. On the premise of ensuring the connection firmness, it is ensured that the stator axial adjusting magnet blocks 6 can play a role in modulating the magnetic field.

[0060] In order to further improve the installation accuracy, the mounting block 401 has a first guiding block 403. The axial cross-section of the first guiding block 403 is rectangular. The stator radial adjusting magnet block 5 has a first guiding groove 501 adapted to the first guiding block 403. The first guiding block 403 is slidably connected to the first guiding groove 501. The first guiding block 403 is arranged along the radial direction of the stator frame 4, which facilitates the installation of the stator radial adjusting magnet block 5 and at the same time ensures the installation accuracy. The mounting rod 402 has a second guiding block 404. The second guiding block 404 has an arc-shaped structure facing the stator axial adjusting magnet block 6. The stator axial adjusting magnet block 6 has a second guiding groove 601 adapted to the second guiding block 404. The second guiding block 404 is slidably connected to the second guiding groove 601, which facilitates the installation operation. The second guiding block 404 has an arc-shaped structure, which reduces the processing difficulty and improves the adaptability of the magnetic gear.

[0061] At the same time, the stator unit 200 further includes a stator end cover 13. The stator end cover 13 is inserted and connected to the mounting rod 402. A fixing pin 14 is arranged at one end of the mounting rod 402 passing through the stator end cover 13. The fixing pin 14 is inserted and connected to the mounting rod 402. The axis of the fixing pin 14 is perpendicular to the insertion direction of the mounting rod 402 and the stator end cover 13. The stator end cover 13 abuts against the stator axial adjusting magnet block 6, which improves the structural stability of the stator axial adjusting magnet block 6. After the mounting rod 402 passes through the stator end cover 13, it is fixed by the fixing pin 14, effectively preventing the mounting rod 402 from sliding relative to the stator end cover 13 and improving the stability and reliability of the stator unit 200.

[0062] Further, the outer rotor frame 7 is a hollow cylindrical structure. An installation groove 701 is provided on the radial end surface of one end of the outer rotor frame 7 facing the stator unit 200. The outer rotor radial permanent magnet 8 is arranged in the installation groove 701. The side wall of the installation groove 701 is a hollowed-out structure. The outer rotor radial permanent magnet 8 drives the outer rotor frame 7 to rotate by extruding the hollowed-out side wall of the installation groove 701 and transmits torque. The outer rotor radial permanent magnet 8 is arranged opposite to the stator radial adjusting magnet block 5; connection blocks 702 are arranged on the inner peripheral surface of the outer rotor frame 7. The outer rotor axial permanent magnet 9 is inserted and connected with the connection blocks 702, and the insertion direction is parallel to the axis direction of the outer rotor, so that the outer rotor axial permanent magnet 9 can drive the outer rotor frame 7 to rotate smoothly. The outer rotor axial permanent magnet 9 is arranged opposite to the stator axial adjusting magnet block 6.

[0063] In addition, the outer rotor unit 300 further includes a positioning sleeve 15 and an outer rotor end cover 16. The outer rotor frame 7 is sleeved outside the positioning sleeve 15. The positioning sleeve 15 is arranged at one end of the outer rotor axial permanent magnet 9 away from the stator unit 200. The positioning sleeve 15 abuts against the outer rotor axial permanent magnet 9. The outer rotor end cover 16 is detachably connected to the outer rotor frame 7. The outer rotor end cover 16 abuts against the positioning sleeve 15. The positioning sleeve 15 and the outer rotor end cover 16 are used to position the outer rotor axial permanent magnet 9 to prevent the outer rotor axial permanent magnet 9 from axially sliding and improve the working stability of the outer rotor unit 300. In other specific embodiments of the present invention, the radial cross-section of the connection block 702 is trapezoidal to improve the torque transmission efficiency.

[0064] In this specific embodiment, the number of pole pairs of the inner rotor radial permanent magnet 2, the inner rotor axial permanent magnet 3, the outer rotor radial permanent magnet 8, and the outer rotor axial permanent magnet 9 are all multiple pairs. The inner rotor radial permanent magnet 2, the inner rotor axial permanent magnet 3, the outer rotor radial permanent magnet 8, and the outer rotor axial permanent magnet 9 are all Halbach arrays. Through the Halbach array, the magnetic field utilization rate of the permanent magnets of the inner and outer rotors is improved, and the requirements of P o =P s -P i are met. By adjusting the setting quantities of P o 、P s and P i , the device realizes transmission with a transmission ratio in the radial and axial directions, improving the transmission smoothness while enhancing the transmitted torque.

[0065] It should also be explained that key grooves can be provided on both the inner rotor frame 1 and the outer rotor frame 7 to facilitate connection with the input shaft and the output shaft. In actual applications, a suitable transmission connection method can also be selected according to specific working conditions.

[0066] The present invention can achieve different transmission ratios by using different numbers of permanent magnet arrangements, and at the same time adopts Halbach arrays and parallel connection of radial and axial permanent magnets to improve the magnetic field utilization rate and the transmitted torque. In addition, the present invention mostly adopts a detachable connection method, which facilitates the disassembly and assembly caused by different requirements for the number of permanent magnets, and improves the flexible adaptability of the magnetic gear.

[0067] Specific examples are applied in the present invention to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A magnetic field modulation type magnetic gear, characterized in that, comprising: An inner rotor unit, the inner rotor unit includes an inner rotor frame, inner rotor radial permanent magnets and inner rotor axial permanent magnets, the inner rotor radial permanent magnets and the inner rotor axial permanent magnets are respectively detachably connected to the inner rotor frame, and the inner rotor radial permanent magnets and the inner rotor axial permanent magnets can each form at least a pair of magnetic pole pairs, and the inner rotor frame is made of a magnetic isolation material; A stator unit, the stator unit includes a stator frame, stator radial magnetic modulation blocks and stator axial magnetic modulation blocks, the stator radial magnetic modulation blocks and the stator axial magnetic modulation blocks are respectively detachably connected to the stator frame; An outer rotor unit, the outer rotor unit includes an outer rotor frame, outer rotor radial permanent magnets and outer rotor axial permanent magnets, the outer rotor radial permanent magnets and the outer rotor axial permanent magnets are respectively detachably connected to the outer rotor frame, and the outer rotor radial permanent magnets and the outer rotor axial permanent magnets can each form at least a pair of magnetic pole pairs; The stator unit is sleeved outside the inner rotor unit and there is a gap between them, the outer rotor unit is sleeved outside the inner rotor unit and there is a gap between them, the stator radial magnetic modulation blocks are located between the inner rotor radial permanent magnets and the outer rotor radial permanent magnets, and the stator axial magnetic modulation blocks are located between the inner rotor axial permanent magnets and the outer rotor axial permanent magnets.

2. The magnetic field modulation type magnetic gear according to claim 1, characterized in that: The number of pole pairs of the inner rotor radial permanent magnet is P i , the number of stator radial magnetic tuning blocks is P s , the number of pole pairs of the outer rotor radial permanent magnet is P o , then: P o = P s - P i ; Accordingly, the number of pole pairs of the inner rotor axial permanent magnet is P i1 , the number of stator axial adjusting magnetic blocks is P s1 , the number of pole pairs of the outer rotor axial permanent magnet is P o1 , then: P o1 = P s1 - P i1 .

3. The magnetic field modulation type magnetic gear according to claim 1, characterized in that: The inner rotor frame is a stepped structure, and on the radial end face with a larger diameter at one end of the inner rotor frame facing the stator unit, there are mounting pits, the inner rotor radial permanent magnets are arranged in the mounting pits, and the inner rotor radial permanent magnets are connected to the mounting pits in a plug-in manner; on the outer peripheral surface of the inner rotor frame extending into the stator unit, there are slots, the slots are arranged parallel to the axis of the inner rotor frame, circumferential stoppers are arranged in the slots, the circumferential stoppers are connected to the slots in a plug-in manner, the inner rotor axial permanent magnets are arranged between two adjacent circumferential stoppers, and the circumferential stoppers are made of a magnetic isolation material.

4. The magnetic field modulation type magnetic gear according to claim 3, characterized in that: The inner rotor unit further includes an inner rotor end cover, the inner rotor end cover is arranged at one end of the inner rotor axial permanent magnet away from the inner rotor radial permanent magnet, the inner rotor end cover abuts against the inner rotor axial permanent magnet, the inner rotor end cover is detachably connected to the inner rotor frame, and positioning pins are arranged between the inner rotor frame and the inner rotor radial permanent magnets and between the inner rotor axial permanent magnets and the inner rotor end cover.

5. The magnetic field modulation type magnetic gear according to claim 1, characterized in that: The stator frame has a stepped structure. A radial end face with a larger diameter at one end of the stator frame facing the outer rotor unit has mounting blocks. The stator radial magnetic modulation blocks are inserted and connected to the mounting blocks. The stator radial magnetic modulation blocks are arranged between two adjacent mounting blocks and are arranged opposite to the inner rotor radial permanent magnets. The stator frame is further provided with mounting rods, which are circumferentially distributed uniformly along the axis of the stator frame. The stator axial magnetic modulation blocks are inserted and connected to the mounting rods. The stator axial magnetic modulation blocks are arranged between two adjacent mounting rods and are arranged opposite to the inner rotor axial permanent magnets.

6. The magnetic field modulation type magnetic gear according to claim 5, wherein: The mounting block has a first guiding block. The axial cross-section of the first guiding block is rectangular. The stator radial magnetic modulation block has a first guiding groove adapted to the first guiding block. The first guiding block is slidably connected to the first guiding groove. The mounting rod has a second guiding block. The second guiding block has an arc-shaped structure facing the stator axial magnetic modulation block. The stator axial magnetic modulation block has a second guiding groove adapted to the second guiding block. The second guiding block is slidably connected to the second guiding groove.

7. The magnetic field modulation type magnetic gear according to claim 5, wherein: The stator unit further includes a stator end cover. The stator end cover is inserted and connected to the mounting rod. A fixing pin is arranged at one end of the mounting rod passing through the stator end cover. The fixing pin is inserted and connected to the mounting rod. The axis of the fixing pin is perpendicular to the insertion direction of the mounting rod and the stator end cover.

8. The magnetic field modulation type magnetic gear according to claim 1, wherein: The outer rotor frame has a hollow cylindrical structure. A mounting groove is provided on the radial end face at one end of the outer rotor frame facing the stator unit. The outer rotor radial permanent magnets are arranged in the mounting groove and are arranged opposite to the stator radial magnetic modulation blocks. Connecting blocks are provided on the inner circumferential surface of the outer rotor frame. The outer rotor axial permanent magnets are inserted and connected to the connecting blocks and are arranged opposite to the stator axial magnetic modulation blocks.

9. The magnetic field modulation type magnetic gear according to claim 8, wherein: The outer rotor unit further includes a positioning sleeve and an outer rotor end cover. The outer rotor frame is sleeved outside the positioning sleeve. The positioning sleeve is arranged at one end of the outer rotor axial permanent magnet away from the stator unit. The positioning sleeve abuts against the outer rotor axial permanent magnet. The outer rotor end cover is detachably connected to the outer rotor frame. The outer rotor end cover abuts against the positioning sleeve. The radial cross-section of the connecting block is trapezoidal.

10. The magnetic field modulation type magnetic gear according to any one of claims 1-9, wherein: The number of pole pairs of the inner rotor radial permanent magnet, the inner rotor axial permanent magnet, the outer rotor radial permanent magnet, and the outer rotor axial permanent magnet is multiple, and the inner rotor radial permanent magnet, the inner rotor axial permanent magnet, the outer rotor radial permanent magnet, and the outer rotor axial permanent magnet are all Halbach arrays.

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