Direct drive motor

Abstract

A direct drive motor includes: a support shaft; the coil winding is wound on the iron core; the inner rotor assembly is located on the radial outer side of the supporting shaft; the outer rotor assembly is located on the radial outer side of the inner rotor assembly; the magnetism adjusting assembly is provided with a plurality of magnetism adjusting blocks, is located between the inner rotor assembly and the outer rotor assembly in the radial direction and is fixed relative to the supporting shaft, a gap exists between the magnetism adjusting assembly and the inner rotor assembly, and a gap exists between the magnetism adjusting assembly and the outer rotor assembly; the output shaft extends along the axis and is detachably fixed to the outer rotor assembly; the direct-drive motor further comprises a barrel-shaped fixing frame, the peripheral side wall of the fixing frame is provided with a containing groove, the containing groove extends in the direction parallel to the axis, the magnetism adjusting block is located in the containing groove, and the axial end of the fixing frame forms a shell of the second axial end of the direct-drive motor.

Description

Technical Field

[0001] The present invention relates to a direct drive motor, and more particularly to a direct drive motor that is easy to assemble. Background Art

[0002] During the operation of the direct drive motor, the rotation of the motor rotor is transmitted to the output shaft via the magnetic gear. Compared with the mechanical gear of the transmission, the magnetic gear avoids the problems of friction loss and mechanical vibration. However, in the prior art, the structure of the magnetic gear system is relatively complex, making it difficult to assemble and the cost is high.

[0003] Therefore, it is desired to propose a direct drive motor to improve the deficiencies of the prior art. Summary of the invention

[0004] According to one aspect of the present invention, a direct-drive motor is proposed, comprising: a support shaft extending along the axis of the direct-drive motor; an iron core fixed to the support shaft, with a coil winding wound on the iron core; an inner rotor assembly located radially outside the support shaft and configured to be rotatable around the axis; an outer rotor assembly located radially outside the inner rotor assembly and configured to be rotatable around the axis; a magnetic adjustment assembly having a plurality of magnetic adjustment blocks, located between the inner rotor assembly and the outer rotor assembly in the radial direction and fixed relative to the support shaft, with a gap between the magnetic adjustment assembly and the inner rotor assembly, and a gap between the magnetic adjustment assembly and the outer rotor assembly; an output shaft extending along the axis and detachably fixed to the outer rotor assembly; wherein the direct-drive motor further comprises a barrel-shaped fixing frame, the fixing frame being fixed to the support shaft, the fixing frame being provided with a receiving groove on its radial outer periphery, the receiving groove extending in a direction parallel to the axis, the magnetic adjustment block being located in the receiving groove, and the axial end of the fixing frame forming the outer shell of the second axial end of the direct-drive motor.

[0005] According to this solution, the barrel-shaped fixing frame serves as both a mounting component for the magnetic adjustment block and a part of the housing of the direct-drive motor, thereby making the structure of the direct-drive motor simpler and reducing the assembly cost of the direct-drive motor.

[0006] In some embodiments, the inner rotor assembly may include: a barrel-shaped inner rotor casing, at least partially surrounding the iron core, the iron core being located between the axial end of the fixing frame and the axial end of the inner rotor casing in the axial direction; a motor magnet fixed to the inner peripheral side wall of the inner rotor casing, the motor magnet being opposite to the iron core in the radial direction; an inner rotor magnet fixed to the outer peripheral side wall of the inner rotor casing, the inner rotor magnet being opposite to the magnetic adjustment assembly in the radial direction.

[0007] In some aspects, the inner rotor assembly may further include an inner rotor bearing fixed to the support shaft, the inner rotor bearing configured to support the inner rotor housing.

[0008] In some embodiments, the axial end of the inner rotor housing may have: a first portion extending between the radial outer periphery of the inner rotor housing and the radial outer periphery of the inner rotor bearing, a second portion extending from the first portion toward the iron core, and the inner rotor bearing is configured to support the second portion; and a third portion extending from an end of the second portion away from the first portion toward the support shaft, and a second axial end of the inner rotor bearing is in contact with the third portion.

[0009] In some aspects, the inner rotor assembly may further include an end cover, wherein an axial end of the end cover is detachably fixed to an axial end of the inner rotor casing.

[0010] In some aspects, a portion of the axial end portion of the end cap may contact the first axial end of the inner rotor bearing.

[0011] In some solutions, the support shaft may have a shoulder protruding outward in the radial direction, and the first axial end of the inner rotor bearing abuts against a second end of the shoulder.

[0012] In some solutions, a portion of the inner rotor magnetic steel may be fixed to the outer peripheral side wall of the inner rotor housing, and another portion of the inner rotor magnetic steel may be fixed to the outer peripheral side wall of the end cover.

[0013] In some aspects, the inner rotor magnets may not extend beyond the inner rotor housing in the axial direction.

[0014] In some embodiments, there may be a gap between the end cover and the inner rotor magnets.

[0015] In some embodiments, the fixing frame may include a hollow shaft, and the supporting shaft passes through a hollow portion of the hollow shaft.

[0016] According to this solution, because the hollow shaft of the fixing frame can support the supporting shaft, the number of required bearings is reduced, thereby reducing the cost of the direct drive motor.

[0017] In some arrangements, the second axial end of the inner rotor bearing may abut the hollow shaft.

[0018] In some aspects, the core may be secured to the hollow shaft.

[0019] In some solutions, the magnetic adjustment block is formed of a magnetic conductive material, and the fixing frame is formed of a non-magnetic conductive material.

[0020] In some solutions, the width of the magnetic tuning block may be equal to the width of the fixing frame between two adjacent magnetic tuning blocks.

[0021] According to this solution, the structural strength of the fixing frame is ensured while the magnetic adjustment block can also be ensured to have a sufficient magnetic conductive area.

[0022] In some embodiments, the outer rotor assembly may include: a barrel-shaped outer rotor casing, an axial end of the outer rotor casing forming an outer shell of a first axial end of the direct-drive motor, a radial outer periphery of the outer rotor casing forming a circumferential outer shell of the direct-drive motor, and an output shaft removably fixed to the axial end of the outer rotor casing; and an outer rotor magnet, opposite to the fixing frame in a radial direction, and fixed to the inner peripheral side wall of the outer rotor casing.

[0023] In some embodiments, the inner rotor magnetic steel, the outer rotor magnetic steel and the magnetic tuning block have the same length in the axial direction.

[0024] According to this solution, the lengths of the inner rotor magnetic steel, the outer rotor magnetic steel and the magnetic adjustment block correspond, maximizing material utilization.

[0025] In some aspects, the outer rotor housing may have a step portion protruding from an inner peripheral side wall of the outer rotor housing toward the axis, and one end of the outer rotor magnetic steel contacts the step portion.

[0026] In some aspects, the outer rotor assembly may further include an outer rotor bearing fixed to the support shaft, the outer rotor bearing configured to support the outer rotor housing, the outer rotor bearing being closer to the first axial end of the direct drive motor than the inner rotor bearing.

[0027] In some embodiments, the axial end of the outer rotor housing may have: a fourth portion extending between the radial outer periphery of the outer rotor housing and the radial outer periphery of the outer rotor bearing; a fifth portion extending from the fourth portion toward the inner rotor bearing, the outer rotor bearing being configured to support the fifth portion; and a sixth portion extending from an end of the fifth portion away from the fourth portion toward the support shaft, the second axial end of the outer rotor bearing being in contact with the sixth portion.

[0028] In some aspects, a portion of the axial end portion of the output shaft may contact the first axial end of the outer rotor bearing.

[0029] In some arrangements, the second axial end of the outer rotor bearing may abut the first end of the shoulder.

[0030] In some aspects, the mounting holes between the output shaft and the outer rotor housing may be aligned with the mounting holes between the end cover and the inner rotor housing.

[0031] According to this solution, when the outer rotor system has not yet been assembled, the end cover can be replaced by the output shaft to form a single motor structure, which can be used for testing and detecting the motor performance.

[0032] In some aspects, the inner rotor housing and the outer rotor housing may be formed of a magnetically conductive material. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 An external schematic diagram of a direct drive motor according to an embodiment of the present invention is shown;

[0034] Figure 2 shows an exploded view of a direct drive motor according to an embodiment of the present invention;

[0035] Figure 3 A radial cross-sectional view of a direct drive motor according to an embodiment of the present invention is shown;

[0036] Figure 4 A schematic diagram of a fixing frame of a direct drive motor according to an embodiment of the present invention is shown;

[0037] Figure 5 An axial cross-sectional view of a direct drive motor according to a first embodiment of the present invention is shown;

[0038] Figure 6 An axial cross-sectional view of a direct drive motor according to a second embodiment of the present invention is shown;

[0039] Figure 7 An axial cross-sectional view of a direct drive motor according to a third embodiment of the present invention is shown.

[0040] Reference numerals

[0041] 1 Direct drive motor

[0042] 10 Support shaft

[0043] 12 Shoulders

[0044] 20 Iron Core

[0045] 30 Output shaft

[0046] 32 Axial end

[0047] 40 Fixing bracket

[0048] 42 Radial circumference

[0049] 44 Receiving slot

[0050] 46 Axial end

[0051] 48 Hollow shaft

[0052] 100 Inner rotor assembly

[0053] 110 Inner rotor housing

[0054] 112 Radial periphery

[0055] 114 Axial end

[0056] 114-1 Part 1

[0057] 114-2 Part 2

[0058] 114-3 Part 3

[0059] 116 Mounting holes

[0060] 120 Motor magnet

[0061] 130 Inner rotor magnet

[0062] 140 Inner rotor bearing

[0063] 150 End cap

[0064] 152 Axial end

[0065] 200 Outer rotor assembly

[0066] 210 Outer rotor housing

[0067] 212 Radial periphery

[0068] 214 Axial end

[0069] 214-1 Part 4

[0070] 214-2 Part 5

[0071] 214-3 Part VI

[0072] 216 Steps

[0073] 218 Mounting holes

[0074] 220 Outer rotor magnet

[0075] 230 Outer rotor bearing

[0076] 300 Magnetic Adjustment Components

[0077] 310 Magnetic Block DETAILED DESCRIPTION

[0078] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0079] For a clearer description, unless otherwise expressly stated, the meanings of the directional terms appearing in this article are as follows: the axial direction refers to the direction of the axis of the direct-drive motor, and the radial direction refers to the direction passing through the axis of the direct-drive motor and perpendicular to the axial direction. The radial outer side refers to the side away from the axis of the direct-drive motor, and the radial inner side refers to the side close to the axis of the direct-drive motor. The directional terms "up", "down", "left", and "right" appearing in this article are merely exemplary descriptions for the convenience of description and are not intended to limit specific directional relationships.

[0080] Figure 2 and Figure 3 The exploded view and radial cross-sectional view of the direct drive motor 1 according to an embodiment of the present invention are respectively shown, and the direct drive motor 1 mainly includes a support shaft 10, an iron core 20, an inner rotor assembly 100, an outer rotor assembly 200, a magnetic adjustment assembly 300 and an output shaft 30. The support shaft 10 extends along the axis of the direct drive motor 1 to provide radial support for the components of the direct drive motor 1. The iron core 20 is fixed to the support shaft 10, and a coil (not shown) is wound around the iron core 20, and the iron core 20 acts as a stator of the direct drive motor 1.

[0081] The inner rotor assembly 100 is located radially outside the support shaft 10 and is configured to rotate around the axis of the direct drive motor 1. The inner rotor assembly 100 includes a magnetic conductive material. The outer rotor assembly 200 is located radially outside the inner rotor assembly 100 and is configured to rotate around the axis of the direct drive motor 1. The outer rotor assembly 200 includes a magnetic conductive material. The magnetic adjustment assembly 300 has a plurality of magnetic adjustment blocks 310 and is located between the inner rotor assembly 100 and the outer rotor assembly 200 in the radial direction. The magnetic adjustment assembly 300 is fixed relative to the support shaft 10, and there is a gap between the magnetic adjustment assembly 300 and the inner rotor assembly 100 and the outer rotor assembly 200. The magnetic adjustment blocks 310 include a magnetic conductive material. The inner rotor assembly 100, the magnetic adjustment assembly 300 and the outer rotor assembly 200 arranged in sequence from the inside to the outside in the radial direction form a magnetic gear. The rotational movement of the inner rotor assembly 100 is coupled and transmitted to the outer rotor assembly 200 through the magnetic field energy coupling of the magnetic adjustment block 310 of the magnetic adjustment assembly 300, and its transmission ratio can be designed by changing the parameters of the above-mentioned magnetic gear.

[0082] The output shaft 30 extends along the axis of the direct drive motor 1 and is detachably fixed to the outer rotor assembly 200. The driving process of the direct drive motor 1 is briefly described below. When the direct drive motor 1 is powered on, the coil in the iron core 20 acting as the stator generates current, and the current generates a magnetic field around it. The inner rotor assembly 100 rotates under the action of the magnetic field. The rotation of the inner rotor assembly 100 is transmitted to the outer rotor assembly 200 via the magnetic adjustment assembly 300, and the outer rotor assembly 200 drives the output shaft 30 to rotate.

[0083] In order to facilitate the assembly of the direct drive motor 1, the direct drive motor 1 according to the embodiment of the present invention further includes a barrel-shaped fixing frame 40, which has a radial outer periphery 42 and an axial end 46. The fixing frame 40 is fixed to the support shaft 10. The radial outer periphery 42 of the fixing frame 40 is located between the inner rotor assembly 100 and the outer rotor assembly 200 in the radial direction and is provided with a receiving groove 44, which extends in a direction parallel to the axis of the direct drive motor 1, and the magnetic adjustment block 310 is assembled in the receiving groove 44. Figure 1 As shown, the axial end 46 of the fixing frame 40 forms the second axial end of the direct drive motor 1 (for example, Figure 5 The barrel-shaped fixing frame 40 serves as both a mounting component for the magnetic adjustment block 310 and a part of the housing of the direct-drive motor 1, making the structure of the direct-drive motor 1 simpler and reducing the assembly cost of the direct-drive motor 1.

[0084] like Figure 5 As shown, the inner rotor assembly 100 mainly includes an inner rotor housing 110 , a motor magnet 120 , an inner rotor magnet 130 , an inner rotor bearing 140 and an end cover 150 .

[0085] The inner rotor housing 110 has a barrel shape and at least partially surrounds the iron core 20, so that the iron core 20 is located between the axial end 46 of the fixing frame 40 and the axial end 114 of the inner rotor housing 110 in the axial direction. In other words, the barrel-shaped inner rotor housing 110 and the barrel-shaped fixing frame 40 are inserted to form a space for accommodating the iron core 20. The inner rotor housing 110 is formed of a magnetically conductive material, so that a conductive magnetic circuit is formed between the motor magnetic steel 120 and the inner rotor magnetic steel 130 via the inner rotor housing 110.

[0086] The motor magnet 120 is located between the iron core 20 and the inner rotor housing 110 in the radial direction, the radial inner side of the motor magnet 120 is opposite to the radial outer side of the iron core 20 with a certain gap, and the radial outer side of the motor magnet 120 is fixed to the inner circumferential side wall of the inner rotor housing 110.

[0087] The inner rotor magnet 130 is located between the inner rotor housing 110 and the magnetic adjustment assembly 130 in the radial direction, the radial inner side of the inner rotor magnet 130 is fixed to the inner rotor housing 110, and the radial outer side of the inner rotor magnet 130 is opposite to the radial inner side of the magnetic adjustment assembly 130 with a certain gap. The motor magnet 120, the inner rotor housing 110 and the inner rotor magnet 130 form a magnetic circuit, so that the magnetic field generated by the energized coil of the iron core 20 is transmitted to the vicinity of the magnetic adjustment assembly 130.

[0088] The inner rotor bearing 140 is fixed to the support shaft 10, and the inner rotor bearing 140 is configured to support the inner rotor housing 110. Preferably, a portion of the axial end 152 of the end cover 150 can be aligned with the first axial end (eg, Figure 5 The inner rotor bearing 140 contacts the end cover 150, so that the inner rotor assembly 100 is restricted from moving rightward. Preferably, the support shaft 10 may have a shoulder 12 protruding outward in the radial direction, and the first axial end of the inner rotor bearing 140 abuts against the second end of the shoulder 12 (as shown in FIG. Figure 5 The right end shown in the figure realizes the mutual limitation of the support shaft 10 and the inner rotor bearing 140 in the axial direction.

[0089] The end cover 150 is detachably fixed to the inner rotor housing 110, for example, aligned mounting holes 116 are provided on the axial end 152 of the end cover 150 and the axial end 114 of the inner rotor housing 110, and screws pass through the two mounting holes 116 to fix the end cover 150 to the inner rotor housing 110. There may be a gap between the end cover 150 and the inner rotor magnetic steel 130, which ensures that the end cover 150 can be smoothly disassembled and assembled to the inner rotor housing 110, and also ensures that the air gap between the end cover 150 and the inner rotor magnetic steel 130 is not too large to have a significant impact on the magnetic circuit reluctance of the magnetic gear system.

[0090] Specifically, the axial end 114 of the inner rotor housing 110 may have a first portion 114-1, a second portion 114-2, and a third portion 114-3, and the first portion 114-1, the second portion 114-2, and the third portion 114-3 form a "Z"-shaped bend. The first portion 114-1 extends between the radial outer periphery 112 of the inner rotor housing 110 and the radial outer periphery of the inner rotor bearing 140. The second portion 114-2 extends from the first portion 114-1 toward the core 20, and the inner rotor bearing 140 is configured to support the second portion 114-2, thereby supporting the inner rotor housing 110. The third portion 114-3 extends from an end of the second portion 114-2 away from the first portion 114-1 (such as Figure 5 The right end shown in FIG. 10 extends toward the support shaft 10, and the second axial end of the inner rotor bearing 140 (as shown in FIG. Figure 5 The inner rotor bearing 140 is in contact with the third portion 114-3, so that the inner rotor housing 110 is limited to move to the left, thereby limiting the inner rotor assembly 100 from moving to the left. In combination with the inner rotor bearing 140 limiting the inner rotor assembly 100 from moving to the right as described above, the inner rotor bearing 140 limits the axial movement of the inner rotor assembly 100. In other words, the inner rotor assembly 100 cannot move axially to the left or right, and can only rotate around the axis of the direct drive motor 1.

[0091] like Figure 4As shown, the fixing frame 40 may include a hollow shaft 48, and the support shaft 10 passes through the hollow portion of the hollow shaft 48. Because the hollow shaft 48 of the fixing frame 40 can support the support shaft 10, the number of required bearings is reduced, and the cost of the direct drive motor 1 is reduced. The second axial end of the inner rotor bearing 140 can abut against the hollow shaft 48. In combination with the above, the first axial end and the second axial end of the inner rotor bearing 140 abut against the shoulder 12 of the support shaft 10 and the hollow shaft 48, respectively, to prevent the inner rotor bearing 140 from moving in the axial direction. At the same time, the left end of the hollow shaft 48 is limited by the inner rotor bearing 140, and the right end is limited by the retaining spring, to prevent the fixing frame 40 from moving in the axial direction. In addition, the iron core 20 can be fixed to the outer peripheral surface of the hollow shaft 48.

[0092] Back to Figure 5 The outer rotor assembly 200 mainly includes an outer rotor housing 210, an outer rotor magnet 220 and an outer rotor bearing 230. The output shaft 30 is detachably fixed to the outer rotor housing 210, for example, aligned mounting holes 218 are provided on the axial end 32 of the output shaft 30 and the axial end 241 of the outer rotor housing 210, and screws pass through the two mounting holes 218 to fix the output shaft 30 to the outer rotor housing 210, so that the output shaft 30 and the outer rotor housing 210 rotate at the same speed. The support shaft 10 provides support for the direct drive motor 1, and the outer rotor housing 210 is fixed to the output shaft 30, avoiding a multi-layer closed structure, making the structure of the direct drive motor 1 simple and using fewer parts.

[0093] The outer rotor housing 210 has a barrel shape, and the axial end 214 of the outer rotor housing 210 forms a first axial end of the direct drive motor 1 (eg, Figure 5 The outer rotor housing 210 is a housing (shown at the left end), and the radial outer periphery 212 of the outer rotor housing 210 forms the circumferential housing of the direct-drive motor 1. Combined with the barrel-shaped fixing frame 40 described above, the barrel-shaped fixing frame 40 and the barrel-shaped outer rotor housing 210 are inserted into each other to form the internal space of the direct-drive motor 1. Through three barrel-shaped components that can be inserted into each other (from the outside to the inside, the outer rotor housing 210, the fixing frame 40 and the inner rotor housing 110), the motor system (support shaft 10, iron core 20 and output shaft 30), the inner rotor assembly 100, the outer rotor assembly 200 and the magnetic adjustment assembly 300 can be assembled in series in sequence, further simplifying the assembly process of the direct-drive motor 1. The outer rotor housing 210 is formed of a magnetic conductive material, so that the outer rotor magnet 220 and the outer rotor housing 210 form a conductive magnetic circuit.

[0094] The outer rotor magnet 220 is located between the fixing frame 40 and the outer rotor housing 210 in the radial direction, and the radial inner side of the outer rotor magnet 220 is opposite to the radial outer side of the magnetic adjustment assembly 130 with a certain gap, and the radial outer side of the outer rotor magnet 220 is fixed to the radial inner side of the outer rotor housing 110. The rotation of the inner rotor magnet 130 is transmitted to the outer rotor magnet 220 via the magnetic coupling of the magnetic adjustment block 310, so that the outer rotor magnet 220 and the outer rotor housing 210 rotate together. Preferably, the outer rotor housing 210 may have a step portion 216, which protrudes from the inner peripheral side wall of the outer rotor housing 210 toward the axis of the direct drive motor 1, and one end of the outer rotor magnet 220 contacts the step portion 216, which facilitates the positioning and installation of the outer rotor magnet 220.

[0095] The outer rotor bearing 230 is fixed to the support shaft 10 (for example, by a retaining ring or a nut), and the outer rotor bearing 230 is configured to support the outer rotor housing 210. The outer rotor bearing 230 is closer to the first axial end of the direct drive motor 1 than the inner rotor bearing 140. Preferably, a portion of the axial end 32 of the output shaft 30 can be aligned with the first axial end of the outer rotor bearing 230 (such as Figure 5 The outer rotor bearing 230 contacts the first end of the shoulder 12 (as shown in the left end), so that the outer rotor bearing 230 limits the output shaft 30 from moving to the right, thereby limiting the outer rotor assembly 200 from moving to the right. Preferably, the second axial end of the outer rotor bearing 230 abuts against the first end of the shoulder 12 (as shown in the left end). Figure 5 The left end shown in the figure realizes the mutual limitation of the support shaft 10 and the outer rotor bearing 230 in the axial direction.

[0096] Specifically, the axial end 214 of the outer rotor housing 210 may have a fourth portion 214-1, a fifth portion 214-2, and a sixth portion 214-3, and the fourth portion 214-1, the fifth portion 214-2, and the sixth portion 214-3 form a "Z"-shaped bend. The fourth portion 214-1 extends between the radial outer periphery 212 of the outer rotor housing 210 and the radial outer periphery of the outer rotor bearing 230. The fifth portion 214-2 extends from the fourth portion 214-1 toward the inner rotor bearing 140, and the outer rotor bearing 230 is configured to support the fifth portion 214-2, thereby supporting the outer rotor housing 210. The sixth portion 214-3 extends from an end of the fifth portion 214-2 away from the fourth portion 214-1 (such as Figure 5The outer rotor bearing 230 extends toward the support shaft 10, and the second axial end of the outer rotor bearing 230 contacts the sixth portion 214-3, so that the outer rotor bearing 230 limits the outer rotor housing 210 from moving to the left, thereby limiting the outer rotor assembly 200 from moving to the left. Combined with the outer rotor bearing 230 limiting the outer rotor assembly 200 from moving to the right as described above, the outer rotor bearing 230 limits the axial movement of the outer rotor assembly 200. In other words, the outer rotor assembly 200 cannot move axially to the left or right, and can only rotate around the axis of the direct drive motor 1.

[0097] Preferably, the mounting hole 218 between the output shaft 30 and the outer rotor housing 210 can be aligned with the mounting hole 116 between the end cover 150 and the inner rotor housing 110. When the outer rotor system 200 has not yet been assembled, the end cover 150 can be replaced by the output shaft 30 to form a single motor structure, so as to be used for testing and detecting the motor performance. In other words, the transmission influence of the magnetic gear of the direct drive motor 1 is not considered, and only the primary output performance of the direct drive motor 1 is tested.

[0098] The operation mechanism of the magnetic gear of the direct drive motor 1 is described below. The magnetic gear is mainly composed of an inner rotor magnet 130, a magnetic adjustment block 310 and an outer rotor magnet 220. The magnetic adjustment assembly 300 is located between the inner rotor magnet 130 and the outer rotor magnet 220. The inner rotor magnet 130 includes P pairs of magnetic poles, the outer rotor magnet 220 includes Q pairs of magnetic poles, and the magnetic adjustment assembly 300 includes M magnetic adjustment blocks 310. When M=P+Q is satisfied, the inner rotor magnet 130, the outer rotor magnet 220 and the magnetic adjustment block 310 are coupled in the magnetic field through the air gap and transfer energy, so that the speed ratio of the inner rotor magnet 130 and the outer rotor magnet 220 is N1 / N2=Q / P, and the torque ratio is T1 / T2=P / Q. For example, the inner rotor magnetic steel 130 includes 5 pairs of magnetic poles, the outer rotor magnetic steel 220 includes 30 pairs of magnetic poles, and the magnetic adjustment assembly 300 includes 35 magnetic adjustment blocks 310. Then, the speed ratio of the inner rotor magnetic steel 130 to the outer rotor magnetic steel 220 is 6:1, and the torque ratio is 1:6, achieving the purpose of reducing the speed and increasing the torque. The specific number of the above components is only exemplary, and the present invention is not limited thereto. Any other appropriate number of corresponding components can be designed according to specific application requirements.

[0099] In order to meet the magnetic field modulation requirements of the magnetic adjustment component 300, the magnetic adjustment block 310 is formed of a magnetic conductive material, and the fixing frame 40 is formed of a non-magnetic conductive material. In an embodiment of the present invention, the magnetic conductive material may be, for example, No. 20 steel, and the non-magnetic conductive material may be, for example, aluminum. In addition, there are certain requirements for the distribution area of ​​the magnetic adjustment block 310 of the magnetic adjustment component 300 on the fixing frame 40. On the radial periphery 42 of the fixing frame 40, the cross-sectional area of ​​the magnetic adjustment block 310 is S1, and the cross-sectional area of ​​the fixing frame 40 between two adjacent magnetic adjustment blocks 310 on the cross section is S2 (e.g., Figure 3As shown). Preferably, S1=(0.5-1.5)*S2. More preferably, S1=S2 (i.e., the width of the magnetic adjustment block 310 can be equal to the width of the fixing frame between two adjacent magnetic adjustment blocks 310). In this way, the structural strength of the fixing frame 40 is ensured while also ensuring that the magnetic adjustment block 310 has a sufficient magnetic conductive area.

[0100] By changing the length of the inner rotor magnet 130 and the outer rotor magnet 220, different speeds and torque outputs can be achieved. When the required output torque is small, the following can be used: Figure 6 An alternative embodiment is shown. Figure 5 In the illustrated embodiment, the inner rotor magnet 130 and the outer rotor magnet 220 are relatively long, a portion of the inner rotor magnet 130 can be fixed to the outer peripheral side wall of the inner rotor housing 110, and another portion of the inner rotor magnet 130 can be fixed to the outer peripheral side wall of the end cover 150. Figure 6 In the illustrated embodiment, the lengths of the inner rotor magnet 130 and the outer rotor magnet 220 are relatively short, and the inner rotor magnet 130 does not extend beyond the inner rotor housing 110 in the axial direction. In this case, the end cover 150 may be in the shape of a disk and no longer have an outer peripheral side wall (because it is no longer necessary to provide support for the inner rotor magnet 130), thereby saving the cost required for the end cover 150. The radial outer periphery 42 of the magnetic adjustment block 310 and the fixing frame 40 accommodating the magnetic adjustment block 310 may also be shortened accordingly to reduce their cost.

[0101] exist Figure 5 and Figure 6 In the illustrated embodiment, the length L1 of the inner rotor magnetic steel 130, the length L2 of the outer rotor magnetic steel 220, and the length L3 of the magnetic adjustment block can satisfy L1=L2=(0.9-1.1)*L3, and preferably, can satisfy L1=L2=L3. In this way, the lengths of the inner rotor magnetic steel 130, the outer rotor magnetic steel 220, and the magnetic adjustment block 310 correspond to each other, maximizing the material utilization rate.

[0102] In order to realize the serialized production demand of the direct drive motor 1, the following method can also be adopted: Figure 7 In the embodiment shown, the length of the radial outer periphery 42 of the fixing frame 40 in the axial direction is designed to reach its maximum allowable length, and the length L3 of the magnetic adjustment block 310 also reaches its maximum allowable length accordingly. In this case, it is only necessary to adjust the length L1 of the inner rotor magnetic steel 130 and the length L2 of the outer rotor magnetic steel 220 to match the serialized torque output without redesigning other structures of the direct drive motor 1. Preferably, L1=L2≤L3.

[0103] This document describes in detail several exemplary embodiments of the present invention with reference to preferred embodiments. However, it will be understood by those skilled in the art that, without departing from the concept of the present invention, various modifications and variations may be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention may also be combined without exceeding the protection scope of the present invention, which is determined by the appended claims.

Claims

1. A direct drive motor, comprising: A support shaft extending along the axis of the direct drive motor; an iron core fixed to the support shaft, and a coil winding is wound around the iron core; an inner rotor assembly located radially outwardly of the support shaft and configured to rotate about the axis; an outer rotor assembly located radially outward of the inner rotor assembly and configured to be rotatable about the axis; A magnetic adjustment component, comprising a plurality of magnetic adjustment blocks, located between the inner rotor component and the outer rotor component in a radial direction and fixed relative to the support shaft, wherein a gap exists between the magnetic adjustment component and the inner rotor component, and a gap exists between the magnetic adjustment component and the outer rotor component; an output shaft extending along the axis and removably secured to the outer rotor assembly; Among them, the direct drive motor also includes a barrel-shaped fixing frame, which is fixed to the support shaft. The fixing frame is provided with a receiving groove on its radial outer periphery, and the receiving groove extends in a direction parallel to the axis. The magnetic adjustment block is located in the receiving groove, and the axial end of the fixing frame forms the outer shell of the second axial end of the direct drive motor.

2. The direct drive motor according to claim 1, wherein the inner rotor assembly comprises: a barrel-shaped inner rotor casing at least partially surrounding the iron core, wherein the iron core is located between an axial end of the fixing frame and an axial end of the inner rotor casing in the axial direction; A motor magnetic steel is fixed to the inner peripheral side wall of the inner rotor housing, and the motor magnetic steel is opposite to the iron core in the radial direction; The inner rotor magnetic steel is fixed to the outer peripheral side wall of the inner rotor housing, and the inner rotor magnetic steel is opposite to the magnetic adjustment assembly in the radial direction. 3 . The direct drive motor of claim 2 , wherein the inner rotor assembly further comprises an inner rotor bearing fixed to the support shaft, the inner rotor bearing being configured to support the inner rotor housing.

4. The direct drive motor according to claim 3, wherein the axial end of the inner rotor housing has: a first portion extending between a radially outer periphery of the inner rotor housing and a radially outer periphery of the inner rotor bearing, a second portion extending from the first portion toward the core, the inner rotor bearing being configured to support the second portion; A third portion extends from an end of the second portion away from the first portion toward the support shaft, and a second axial end of the inner rotor bearing contacts the third portion. 5 . The direct drive motor according to claim 4 , wherein the inner rotor assembly further comprises an end cover, an axial end of the end cover being detachably fixed to an axial end of the inner rotor housing. 6 . The direct drive motor of claim 5 , wherein a portion of an axial end portion of the end cover contacts the first axial end of the inner rotor bearing. 7 . The direct drive motor according to claim 6 , wherein the support shaft has a shoulder protruding outward in a radial direction, and the first axial end of the inner rotor bearing abuts against a second end of the shoulder.

8. The direct drive motor according to claim 5, wherein a portion of the inner rotor magnetic steel is fixed to an outer peripheral side wall of the inner rotor housing, and another portion of the inner rotor magnetic steel is fixed to an outer peripheral side wall of the end cover. 9 . The direct drive motor according to claim 5 , wherein the inner rotor magnetic steel does not extend beyond the inner rotor housing in the axial direction. 10 . The direct drive motor according to claim 5 , wherein a gap exists between the end cover and the inner rotor magnetic steel. 11 . The direct drive motor according to claim 5 , wherein the fixing bracket comprises a hollow shaft, and the supporting shaft passes through a hollow portion of the hollow shaft. 12 . The direct drive motor according to claim 11 , wherein the second axial end of the inner rotor bearing abuts against the hollow shaft.

13. The direct drive motor of claim 11, wherein the core is fixed to the hollow shaft.

14. The direct drive motor according to claim 1, wherein the magnetic adjustment block is formed of a magnetic conductive material, and the fixing frame is formed of a non-magnetic conductive material. 15 . The direct drive motor according to claim 14 , wherein the width of the magnetic tuning block is equal to the width of the fixing frame between two adjacent magnetic tuning blocks.

16. The direct drive motor of claim 7, wherein the outer rotor assembly comprises: a barrel-shaped outer rotor housing, wherein an axial end of the outer rotor housing forms a housing of a first axial end of the direct-drive motor, a radial outer periphery of the outer rotor housing forms a circumferential housing of the direct-drive motor, and the output shaft is detachably fixed to the axial end of the outer rotor housing; The outer rotor magnetic steel is opposite to the fixing frame in the radial direction, and the outer rotor magnetic steel is fixed to the inner peripheral side wall of the outer rotor housing. 17 . The direct drive motor according to claim 16 , wherein the inner rotor magnetic steel, the outer rotor magnetic steel and the magnetic tuning block have the same length in the axial direction. 18 . The direct drive motor according to claim 16 , wherein the outer rotor housing has a step portion protruding from an inner peripheral side wall of the outer rotor housing toward the axis, and one end of the outer rotor magnetic steel contacts the step portion.

19. The direct drive motor according to claim 16, wherein the outer rotor assembly further comprises an outer rotor bearing, the outer rotor bearing being fixed to the support shaft, the outer rotor bearing being configured to support the outer rotor housing, the outer rotor bearing being closer to the first axial end of the direct drive motor than the inner rotor bearing.

20. The direct drive motor according to claim 19, wherein the axial end of the outer rotor housing has: a fourth portion extending between a radial outer periphery of the outer rotor housing and a radial outer periphery of the outer rotor bearing; a fifth portion extending from the fourth portion toward the inner rotor bearing, the outer rotor bearing being configured to support the fifth portion; A sixth portion extends from an end of the fifth portion away from the fourth portion toward the support shaft, and the second axial end of the outer rotor bearing contacts the sixth portion. 21 . The direct drive motor of claim 16 , wherein a portion of an axial end portion of the output shaft contacts a first axial end of the outer rotor bearing.

22. The direct drive motor of claim 19, wherein the second axial end of the outer rotor bearing abuts the first end of the shoulder.

23. The direct drive motor of claim 19, wherein a mounting hole between the output shaft and the outer rotor housing is aligned with a mounting hole between the end cover and the inner rotor housing.

24. The direct drive motor according to claim 19, characterized in that: The inner rotor housing and the outer rotor housing are formed of magnetically conductive material.

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