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 located between the inner rotor assembly and the outer rotor assembly; the output shaft extends along the axis and is detachably fixed to the outer rotor assembly; the outer rotor assembly comprises a barrel-shaped outer rotor shell, the axial end of the outer rotor shell forms a shell of the first axial end of the direct drive motor, and the radial periphery of the outer rotor shell forms a circumferential shell of the direct drive motor. The direct drive motor further comprises a barrel-shaped fixing frame, the fixing frame is fixed to the supporting shaft, the radial periphery of the fixing frame is located between the inner rotor assembly and the outer rotor assembly in the radial direction, 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 utility model relates to a direct drive motor more particularly, relate to a direct drive motor easy to assemble. BACKGROUND

[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 transmission, the magnetic gear avoids problems such as 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 relatively high in cost.

[0003] Therefore, it is desirable to provide a direct drive motor to improve the deficiencies of the prior art. SUMMARY

[0004] According to an aspect of the utility model, a direct drive motor is provided, comprising: a support shaft extending along an axis of the direct drive motor; an iron core fixed to the support shaft, a coil winding wound around the iron core; an inner rotor assembly located radially outside the support shaft and configured to be able to rotate around the axis; an outer rotor assembly located radially outside the inner rotor assembly and configured to be able to rotate 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, a gap exists between the magnetic adjustment assembly and the inner rotor assembly, and a gap exists 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 outer rotor assembly comprises a barrel-shaped outer rotor housing, the axial end of the outer rotor housing forms the outer shell of the first axial end of the direct drive motor, and the radial outer periphery of the outer rotor housing forms the circumferential outer shell of the direct drive motor; and wherein the direct drive motor further comprises a barrel-shaped fixing frame fixed to the support shaft, the radial outer periphery of the fixing frame is located between the inner rotor assembly and the outer rotor assembly in the radial direction, and the axial end of the fixing frame forms the outer shell of the second axial end of the direct drive motor.

[0005] According to the scheme, the barrel-shaped fixing frame and the barrel-shaped outer rotor housing are plugged together to form the internal space of the direct drive motor, making the assembly of the direct drive motor simpler.

[0006] In some schemes, the fixing frame can be provided with accommodating grooves at its radial outer periphery, the accommodating grooves extending in a direction parallel to the axis, and the magnetic adjustment blocks are located in the accommodating grooves.

[0007] In some schemes, the inner rotor assembly can comprise: a barrel-shaped inner rotor housing 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 housing in the axial direction; motor magnetic steel fixed to the inner peripheral side wall of the inner rotor housing, the motor magnetic steel being opposite the iron core in the radial direction; and inner rotor magnetic steel fixed to the outer peripheral side wall of the inner rotor housing, the inner rotor magnetic steel being opposite the magnetic adjustment assembly in the radial direction.

[0008] In some embodiments, the inner rotor assembly can further include an inner rotor bearing fixed to the support shaft, the inner rotor bearing configured to support the inner rotor housing.

[0009] In some embodiments, the axial end portion of the inner rotor housing can 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 core, the inner rotor bearing configured to support the second portion, and a third portion extending from an end of the second portion distal to the first portion toward the support shaft, the second axial end of the inner rotor bearing in contact with the third portion.

[0010] In some embodiments, the inner rotor assembly can further include an end cap, an axial end portion of the end cap detachably fixed to an axial end portion of the inner rotor housing.

[0011] In some embodiments, a portion of the axial end portion of the end cap can be in contact with the first axial end of the inner rotor bearing.

[0012] In some embodiments, the support shaft can have a shoulder portion protruding outwardly in the radial direction, the first axial end of the inner rotor bearing abutting a second end of the shoulder portion.

[0013] In some embodiments, a portion of the inner rotor magnet can be fixed to an outer peripheral sidewall of the inner rotor housing, and another portion of the inner rotor magnet can be fixed to an outer peripheral sidewall of the end cap.

[0014] In some embodiments, the inner rotor magnet can extend no more than the inner rotor housing in the axial direction.

[0015] In some embodiments, a gap can exist between the end cap and the inner rotor magnet.

[0016] In some embodiments, the fixing frame can include a hollow shaft, the support shaft passing through a hollow portion of the hollow shaft.

[0017] According to this embodiment, because the hollow shaft of the fixing frame can support the support shaft, the number of bearings required is reduced, and the cost of the direct drive motor is reduced.

[0018] In some embodiments, the second axial end of the inner rotor bearing can abut the hollow shaft.

[0019] In some embodiments, the core can be fixed to the hollow shaft.

[0020] In some embodiments, the flux modulation blocks are formed of a magnetic conductive material, and the fixing frame is formed of a non-magnetic conductive material.

[0021] In some embodiments, the width of the flux modulation block can be equal to the width of the fixing frame between two adjacent flux modulation blocks.

[0022] According to the scheme, the structural strength of the fixing frame is ensured, and the magnetic block has sufficient magnetic area.

[0023] In some schemes, the outer rotor assembly can include an outer rotor magnet, the outer rotor magnet being opposite to the fixing frame in the radial direction, the outer rotor magnet being fixed to the inner circumferential side wall of the outer rotor housing.

[0024] In some schemes, the lengths of the inner rotor magnet, the outer rotor magnet and the magnetic block in the axial direction are equal.

[0025] According to the scheme, the lengths of the inner rotor magnet, the outer rotor magnet and the magnetic block are corresponding, and the material utilization rate is maximized.

[0026] In some schemes, the outer rotor housing can have a stepped portion, the stepped portion protruding from the inner circumferential side wall of the outer rotor housing towards the axis, one end of the outer rotor magnet being in contact with the stepped portion.

[0027] In some schemes, the outer rotor assembly can further include 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.

[0028] In some schemes, the axial end portion of the outer rotor housing can 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 towards the inner rotor bearing, the outer rotor bearing being configured to support the fifth portion; a sixth portion extending from one end of the fifth portion away from the fourth portion towards the support shaft, the second axial end of the outer rotor bearing being in contact with the sixth portion.

[0029] In some schemes, a portion of the axial end portion of the output shaft can be in contact with the first axial end of the outer rotor bearing.

[0030] In some schemes, the second axial end of the outer rotor bearing can abut against the first end of the shoulder portion.

[0031] In some schemes, the mounting hole between the output shaft and the outer rotor housing can be aligned with the mounting hole between the end cover and the inner rotor housing.

[0032] According to the scheme, when the outer rotor system has not been assembled, the end cover can be replaced by the output shaft to form a single motor structure, thereby being used for testing and detecting the performance of the motor.

[0033] In some schemes, the inner rotor housing and the outer rotor housing can be formed of a magnetic conductive material. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 An external schematic diagram of a direct drive motor according to an embodiment of the present application is shown.

[0035] Figure 2 An exploded view of a direct drive motor according to an embodiment of the present application is shown;

[0036] Figure 3 A radial cross-sectional view of a direct drive motor according to an embodiment of the present application is shown;

[0037] Figure 4 A schematic view of a fixing frame of a direct drive motor according to an embodiment of the present application is shown;

[0038] Figure 5 An axial cross-sectional view of a direct drive motor according to a first embodiment of the present application is shown;

[0039] Figure 6 An axial cross-sectional view of a direct drive motor according to a second embodiment of the present application is shown;

[0040] Figure 7 An axial cross-sectional view of a direct drive motor according to a third embodiment of the present application is shown.

[0041] Reference numerals

[0042] 1 direct drive motor

[0043] 10 support shaft

[0044] 12 shoulder

[0045] 20 iron core

[0046] 30 output shaft

[0047] 32 axial end portion

[0048] 40 fixing frame

[0049] 42 radial outer periphery

[0050] 44 accommodating groove

[0051] 46 axial end portion

[0052] 48 hollow shaft

[0053] 100 inner rotor assembly

[0054] 110 inner rotor housing

[0055] 112 radial outer periphery

[0056] 114 axial end portion

[0057] 114-1 first portion

[0058] 114-2 second portion

[0059] 114-3 third portion

[0060] 116 mounting hole

[0061] 120 motor magnet

[0062] 130 inner rotor magnet

[0063] 140 inner rotor bearing

[0064] 150 end cover

[0065] 152 axial end

[0066] 200 outer rotor assembly

[0067] 210 outer rotor housing

[0068] 212 radial outer periphery

[0069] 214 axial end

[0070] 214-1 fourth portion

[0071] 214-2 fifth portion

[0072] 214-3 sixth portion

[0073] 216 step portion

[0074] 218 mounting hole

[0075] 220 outer rotor magnet

[0076] 230 outer rotor bearing

[0077] 300 magnet adjusting assembly

[0078] 310 magnet adjusting block DETAILED DESCRIPTION

[0079] In order to make the purpose, scheme and advantages of the technical scheme of the utility model more clear, the technical scheme of the utility model embodiment will be described clearly and completely in the following with reference to the drawings of the specific embodiment of the utility model. Unless otherwise specified, the terms used herein have the usual meaning in the art. The same reference numerals in the drawings represent the same components.

[0080] For the sake of clarity, unless otherwise explicitly stated, the orientation terms appearing in this document have the following meanings: the axial direction is the direction of the axis of the direct drive motor, the radial direction is the direction passing through the axis of the direct drive motor and perpendicular to the axial direction. Radially outward means the side away from the axis of the direct drive motor, and radially inward means the side close to the axis of the direct drive motor. The orientation terms "upper", "lower", "left", "right" appearing in this document are only for the convenience of example description, and are not intended to limit the specific orientation relationship.

[0081] Figure 2 and Figure 3 respectively show an exploded view and a radial cross-sectional view of a direct drive motor 1 according to an embodiment of the present application, the direct drive motor 1 mainly comprises a support shaft 10, an iron core 20, an inner rotor assembly 100, an outer rotor assembly 200, a flux modulation assembly 300 and an output shaft 30. The support shaft 10 extends along the axis of the direct drive motor 1, providing radial support for the components of the direct drive motor 1. The iron core 20 is fixed to the support shaft 10, a coil (not shown) is wound on the iron core 20, and the iron core 20 acts as a stator of the direct drive motor 1.

[0082] The inner rotor assembly 100 is located radially outward of the support shaft 10 and is configured to be rotatable about the axis of the direct drive motor 1, and the inner rotor assembly 100 contains magnetically permeable material. The outer rotor assembly 200 is located radially outward of the inner rotor assembly 100 and is configured to be rotatable about the axis of the direct drive motor 1, and the outer rotor assembly 200 contains magnetically permeable material. The flux modulation assembly 300 has a plurality of flux modulation blocks 310 and is located between the inner rotor assembly 100 and the outer rotor assembly 200 in the radial direction. The flux modulation assembly 300 is fixed relative to the support shaft 10, and there is a gap between the flux modulation assembly 300 and both the inner rotor assembly 100 and the outer rotor assembly 200, and the flux modulation blocks 310 contain magnetically permeable material. The inner rotor assembly 100, the flux modulation assembly 300 and the outer rotor assembly 200 arranged in order from the inside to the outside in the radial direction form a magnetic gear, and the rotational movement of the inner rotor assembly 100 is transmitted to the outer rotor assembly 200 through the magnetic field energy coupling of the flux modulation blocks 310 of the flux modulation assembly 300, and the transmission ratio can be designed by changing the parameters of the above magnetic gear.

[0083] 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 energized, the coil in the iron core 20 acting as a stator generates current, which generates a magnetic field around it, and the inner rotor assembly 100 rotates under the action of the magnetic field, and the rotation of the inner rotor assembly 100 is transmitted to the outer rotor assembly 200 via the flux modulation assembly 300, and the outer rotor assembly 200 drives the output shaft 30 to rotate.

[0084] In order to make the assembly of the direct drive motor 1 more convenient, the direct drive motor 1 according to the embodiment of the present application further comprises a barrel-shaped fixing frame 40, the fixing frame 40 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 extending in a direction parallel to the axis of the direct drive motor 1, and the flux modulation block 310 is assembled in the receiving groove 44. As shown in Figure 1 the axial end 46 of the fixing frame 40 forms the outer shell of the second axial end (for example, the right end) of the direct drive motor 1. The barrel-shaped fixing frame 40 not only serves as a mounting component of the flux modulation block 310, but also serves as part of the outer shell of the direct drive motor 1, so that the structure of the direct drive motor 1 is simpler, and the assembly cost of the direct drive motor 1 is reduced. Figure 5

[0085] As shown in Figure 5 the inner rotor assembly 100 mainly comprises an inner rotor shell 110, a motor magnetic steel 120, an inner rotor magnetic steel 130, an inner rotor bearing 140 and an end cover 150.

[0086] The inner rotor shell 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 shell 110 in the axial direction. In other words, the barrel-shaped inner rotor shell 110 and the barrel-shaped fixing frame 40 are inserted to form a space for accommodating the iron core 20. The inner rotor shell 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 shell 110.

[0087] The motor magnetic steel 120 is located between the iron core 20 and the inner rotor shell 110 in the radial direction, the radial inner side of the motor magnetic steel 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 magnetic steel 120 is fixed to the inner circumferential side wall of the inner rotor shell 110.

[0088] The inner rotor magnetic steel 130 is located between the inner rotor shell 110 and the flux modulation assembly 130 in the radial direction, the radial inner side of the inner rotor magnetic steel 130 is fixed to the inner rotor shell 110, and the radial outer side of the inner rotor magnetic steel 130 is opposite to the radial inner side of the flux modulation assembly 130 with a certain gap. The motor magnetic steel 120, the inner rotor shell 110 and the inner rotor magnetic steel 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 flux modulation assembly 130.

[0089] 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 shell 110. Preferably, a part of the axial end 152 of the end cover 150 can be connected to the first axial end of the inner rotor bearing 140 (as shown in​Figure 5 The inner rotor bearing 140 contacts the left end of the end cap 150, thus restricting the rightward movement of the inner rotor assembly 100. Preferably, the support shaft 10 may have a shoulder 12 projecting outward in the radial direction, with the first axial end of the inner rotor bearing 140 abutting against the second end of the shoulder 12 (as shown on the left end). Figure 5 (As shown on the right end), it realizes the mutual limiting of the support shaft 10 and the inner rotor bearing 140 in the axial direction.

[0090] 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. Screws pass through the two mounting holes 116 to fix the end cover 150 to the inner rotor housing 110. A gap may exist between the end cover 150 and the inner rotor magnet 130, which ensures that the end cover 150 can be easily installed and removed from the inner rotor housing 110, while also ensuring that the air gap between the end cover 150 and the inner rotor magnet 130 is not too large and thus does not significantly affect the magnetic circuit reluctance of the magnetic gear system.

[0091] 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, which 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 iron 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 the end of the second portion 114-2 away from the first portion 114-1 (e.g., ...). Figure 5 The right end shown extends toward the support shaft 10, and the second axial end of the inner rotor bearing 140 (as shown) Figure 5 The inner rotor bearing 140 (as shown on the right end) contacts the third part 114-3, thus restricting the inner rotor housing 110 from moving to the left, thereby restricting the inner rotor assembly 100 from moving to the left. Combined with the foregoing description that the inner rotor bearing 140 restricts the inner rotor assembly 100 from moving to the right, the inner rotor bearing 140 also restricts 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 about the axis of the direct drive motor 1.

[0092] like Figure 4As shown, the mounting bracket 40 may include a hollow shaft 48, through which the support shaft 10 passes. Because the hollow shaft 48 of the mounting bracket 40 can support the support shaft 10, the number of bearings required is reduced, thus reducing the cost of the direct drive motor 1. The second axial end of the inner rotor bearing 140 can abut against the hollow shaft 48. As described above, the first and second axial ends of the inner rotor bearing 140 abut against the shoulder 12 of the support shaft 10 and the hollow shaft 48, respectively, preventing axial movement of the inner rotor bearing 140. Simultaneously, the left end of the hollow shaft 48 is limited by the inner rotor bearing 140, and the right end is limited by a retaining spring, preventing axial movement of the mounting bracket 40. Furthermore, the iron core 20 can be fixed to the outer peripheral surface of the hollow shaft 48.

[0093] Back 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. Screws pass through the two mounting holes 218 to fix the output shaft 30 to the outer rotor housing 210, thereby allowing the output shaft 30 and the outer rotor housing 210 to rotate at the same speed. The support shaft 10 provides support for the direct drive motor 1. The outer rotor housing 210 is fixed to the output shaft 30, avoiding a multi-layered enclosed structure, simplifying the structure of the direct drive motor 1, and reducing the number of components used.

[0094] The outer rotor housing 210 has a barrel-shaped form, and the axial end 214 of the outer rotor housing 210 forms the first axial end of the direct drive motor 1 (e.g., Figure 5 The outer casing (shown at the left end) has a radial outer periphery 212 forming the circumferential casing of the direct drive motor 1. Combined with the barrel-shaped mounting bracket 40 described above, the barrel-shaped mounting bracket 40 and the barrel-shaped outer rotor casing 210 interlock to form the internal space of the direct drive motor 1. Through three interlocking barrel-shaped components (from outside to inside: outer rotor casing 210, mounting bracket 40, and inner rotor casing 110), the motor system (support shaft 10, iron core 20, and output shaft 30), inner rotor assembly 100, outer rotor assembly 200, and magnetic adjustment assembly 300 can be sequentially assembled, further simplifying the assembly process of the direct drive motor 1. The outer rotor casing 210 is formed of a magnetically conductive material, allowing the outer rotor magnet 220 to form a conductive magnetic circuit with the outer rotor casing 210.

[0095] The outer rotor magnet 220 is located radially between the fixed frame 40 and the outer rotor housing 210. The radially inner side of the outer rotor magnet 220 is opposite to the radially outer side of the magnet adjusting assembly 130 with a certain gap. The radially outer side of the outer rotor magnet 220 is fixed to the radially inner side of the outer rotor housing 110. The rotation of the inner rotor magnet 130 is transmitted to the outer rotor magnet 220 through the magnetic coupling of the magnet adjusting 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 stepped portion 216, which protrudes from the inner peripheral sidewall of the outer rotor housing 210 toward the axis of the direct drive motor 1. One end of the outer rotor magnet 220 contacts the stepped portion 216, which facilitates the positioning and installation of the outer rotor magnet 220.

[0096] The outer rotor bearing 230 is fixed to the support shaft 10 (e.g., by a snap ring or nut). The outer rotor bearing 230 is configured to support the outer rotor housing 210 and is located 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 may be connected to the first axial end of the outer rotor bearing 230 (e.g., by a snap ring or nut). Figure 5 The outer rotor bearing 230 contacts the left end of the shoulder 12, thus restricting the output shaft 30 from moving to the right, thereby restricting 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 on the left end), so that the outer rotor bearing 230 restricts the output shaft 30 from moving to the right, thereby restricting the outer rotor assembly 200 from moving to the right. Figure 5 (As shown on the left end), it realizes the mutual limiting of the support shaft 10 and the outer rotor bearing 230 in the axial direction.

[0097] 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, which 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 the end of the fifth portion 214-2 away from the fourth portion 214-1 (e.g., ...). Figure 5The second axial end of the outer rotor bearing 230 contacts the sixth portion 214-3, such that the outer rotor bearing 230 restricts the outer rotor housing 210 from moving to the left, thereby restricting the outer rotor assembly 200 from moving to the left. In combination with the aforementioned outer rotor bearing 230 restricting the outer rotor assembly 200 from moving to the right, the outer rotor bearing 230 restricts the axial movement of the outer rotor assembly 200. In other words, the outer rotor assembly 200 cannot move axially to the left or to the right, but can only rotate about the axis of the direct drive motor 1.

[0098] 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 with the output shaft 30 to form a single motor structure, which can be used for testing and detecting the performance of the motor, etc. That is, without considering the transmission effect of the magnetic gear of the direct drive motor 1, only the primary output performance of the direct drive motor 1 is tested.

[0099] The operation mechanism of the magnetic gear of the direct drive motor 1 is described below. The magnetic gear is mainly composed of the inner rotor magnetic steel 130, the magnetic adjusting block 310, and the outer rotor magnetic steel 220, and the magnetic adjusting assembly 300 is located between the inner rotor magnetic steel 130 and the outer rotor magnetic steel 220. The inner rotor magnetic steel 130 includes P pairs of magnetic poles, the outer rotor magnetic steel 220 includes Q pairs of magnetic poles, and the magnetic adjusting assembly 300 includes M magnetic adjusting blocks 310. When M = P + Q is satisfied, the inner rotor magnetic steel 130, the outer rotor magnetic steel 220, and the magnetic adjusting block 310 are coupled by an air gap for magnetic field coupling and energy transmission, so that the speed ratio N1 / N2 of the inner rotor magnetic steel 130 to the outer rotor magnetic steel 220 is Q / P, and the torque ratio T1 / T2 is 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 adjusting assembly 300 includes 35 magnetic adjusting 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 application is not limited thereto. Any other appropriate number of corresponding components can be designed according to the specific application requirements.

[0100] In order to meet the magnetic field modulation requirements of the magnetic adjusting assembly 300, the magnetic adjusting block 310 is formed of a magnetic conductive material, and the fixing frame 40 is formed of a non-magnetic conductive material. In the embodiment of the present application, the magnetic conductive material can be, for example, No. 20 steel, and the non-magnetic conductive material can be, for example, aluminum. In addition, the distribution area of the magnetic adjusting block 310 of the magnetic adjusting assembly 300 on the fixing frame 40 has certain requirements. On the radial outer periphery 42 of the fixing frame 40, the cross-sectional area of the magnetic adjusting block 310 is S1, and the cross-sectional area of the fixing frame 40 between the adjacent two magnetic adjusting blocks 310 is S2 (as shown in the figure). Figure 3S1 = (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 fixed frame between two adjacent magnetic adjustment blocks 310). In this way, the structural strength of the fixed frame 40 is ensured while the magnetic adjustment block 310 has sufficient magnetic area.

[0101] Different rotational speed and torque output can be achieved by changing the length of the inner rotor magnetic steel 130 and the outer rotor magnetic steel 220. When the required output torque is small, an alternative embodiment as shown in FIG. 6 can be used. In this embodiment, the length of the inner rotor magnetic steel 130 and the outer rotor magnetic steel 220 are relatively short, and the inner rotor magnetic steel 130 does not extend beyond the inner rotor housing 110 in the axial direction. In this case, the end cover 150 can be disc-shaped without having an outer peripheral side wall (as there is no need to provide support for the inner rotor magnetic steel 130), thereby saving the cost of the end cover 150. The radial outer periphery 42 of the fixed frame 40 that accommodates the magnetic adjustment block 310 can also be shortened accordingly to reduce its cost. Figure 6 Figure 5 In the embodiment shown in FIG. 5, the length of the inner rotor magnetic steel 130 and the outer rotor magnetic steel 220 are relatively long, and a portion of the inner rotor magnetic steel 130 can be fixed to the outer peripheral side wall of the inner rotor housing 110, and another portion of the inner rotor magnetic steel 130 can be fixed to the outer peripheral side wall of the end cover 150. In the embodiment shown in FIG. 6, the length of the inner rotor magnetic steel 130 and the outer rotor magnetic steel 220 are relatively short, and the inner rotor magnetic steel 130 does not extend beyond the inner rotor housing 110 in the axial direction. In this case, the end cover 150 can be disc-shaped without having an outer peripheral side wall (as there is no need to provide support for the inner rotor magnetic steel 130), thereby saving the cost of the end cover 150. The radial outer periphery 42 of the fixed frame 40 that accommodates the magnetic adjustment block 310 can also be shortened accordingly to reduce its cost. Figure 6 In the embodiment shown in FIG. 5, the length of the inner rotor magnetic steel 130 and the outer rotor magnetic steel 220 are relatively long, and a portion of the inner rotor magnetic steel 130 can be fixed to the outer peripheral side wall of the inner rotor housing 110, and another portion of the inner rotor magnetic steel 130 can be fixed to the outer peripheral side wall of the end cover 150. In the embodiment shown in FIG. 6, the length of the inner rotor magnetic steel 130 and the outer rotor magnetic steel 220 are relatively short, and the inner rotor magnetic steel 130 does not extend beyond the inner rotor housing 110 in the axial direction. In this case, the end cover 150 can be disc-shaped without having an outer peripheral side wall (as there is no need to provide support for the inner rotor magnetic steel 130), thereby saving the cost of the end cover 150. The radial outer periphery 42 of the fixed frame 40 that accommodates the magnetic adjustment block 310 can also be shortened accordingly to reduce its cost.

[0102] Figure 5 In the embodiment shown in FIG. 5, the length of the inner rotor magnetic steel 130 and the outer rotor magnetic steel 220 are relatively long, and a portion of the inner rotor magnetic steel 130 can be fixed to the outer peripheral side wall of the inner rotor housing 110, and another portion of the inner rotor magnetic steel 130 can be fixed to the outer peripheral side wall of the end cover 150. In the embodiment shown in FIG. 6, the length of the inner rotor magnetic steel 130 and the outer rotor magnetic steel 220 are relatively short, and the inner rotor magnetic steel 130 does not extend beyond the inner rotor housing 110 in the axial direction. In this case, the end cover 150 can be disc-shaped without having an outer peripheral side wall (as there is no need to provide support for the inner rotor magnetic steel 130), thereby saving the cost of the end cover 150. The radial outer periphery 42 of the fixed frame 40 that accommodates the magnetic adjustment block 310 can also be shortened accordingly to reduce its cost. Figure 6 In order to achieve the series production requirement of the direct drive motor 1, an embodiment as shown in FIG. 7 can also be used, in which the length of the radial outer periphery 42 of the fixed frame 40 along 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 value. In this case, only the length L1 of the inner rotor magnetic steel 130 and the length L2 of the outer rotor magnetic steel 220 need to be adjusted to match the series torque output, without the need to redesign other structures of the direct drive motor 1. Preferably, L1 = L2 ≤ L3.

[0103] Figure 7 In order to achieve the series production requirement of the direct drive motor 1, an embodiment as shown in FIG. 7 can also be used, in which the length of the radial outer periphery 42 of the fixed frame 40 along 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 value. In this case, only the length L1 of the inner rotor magnetic steel 130 and the length L2 of the outer rotor magnetic steel 220 need to be adjusted to match the series torque output, without the need to redesign other structures of the direct drive motor 1. Preferably, L1 = L2 ≤ L3.

[0104] ​​​The utility model discloses a plurality of exemplary embodiments of the utility model are described in detail with reference to preferred embodiments, however, the person skilled in the art can understand that the above specific embodiments can be variously changed and modified without departing from the utility model concept, and various technical features and structures proposed by the utility model can also be combined, and the protection scope of the utility model is not exceeded, and the protection scope of the utility model is determined by the appended claims.

Claims

1. A direct drive motor, characterized by, Comprising: a support shaft extending along an axis of the direct drive motor; a core fixed to the support shaft, a coil winding wound around the core; an inner rotor assembly located radially outward of the support shaft and configured to be rotatable around the axis; an outer rotor assembly located radially outward of the inner rotor assembly and configured to be rotatable around the axis; a field regulating assembly having a plurality of field regulating blocks located in a radial direction between the inner rotor assembly and the outer rotor assembly and fixed relative to the support shaft, a gap existing between the field regulating assembly and the inner rotor assembly, a gap existing between the field regulating assembly and the outer rotor assembly; an output shaft extending along the axis and detachably fixed to the outer rotor assembly; wherein the outer rotor assembly comprises a barrel-shaped outer rotor housing, an axial end of the outer rotor housing forming an outer shell of a first axial end of the direct drive motor, a radial outer periphery of the outer rotor housing forming a circumferential outer shell of the direct drive motor; and wherein the direct drive motor further comprises a barrel-shaped fixing frame fixed to the support shaft, a radial outer periphery of the fixing frame located in a radial direction between the inner rotor assembly and the outer rotor assembly, an axial end of the fixing frame forming an outer shell of a second axial end of the direct drive motor.

2. The direct drive electric motor of claim 1, wherein, The fixing frame is provided with a receiving groove at its radial outer periphery, the receiving groove extending in a direction parallel to the axis, the field regulating blocks being located in the receiving groove.

3. The direct drive electric motor of claim 2, wherein, The inner rotor assembly comprises: a barrel-shaped inner rotor housing at least partially enclosing the core, the core being located in an axial direction between an axial end of the fixing frame and an axial end of the inner rotor housing; motor magnetic steel fixed to an inner peripheral side wall of the inner rotor housing, the motor magnetic steel being opposite to the core in a radial direction; inner rotor magnetic steel fixed to an outer peripheral side wall of the inner rotor housing, the inner rotor magnetic steel being opposite to the field regulating assembly in a radial direction.

4. The direct drive electric motor of claim 3, 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.

5. The direct drive electric motor of claim 4, wherein, An axial end of the inner rotor housing has: a first portion extending between a radial outer periphery of the inner rotor housing and a radial outer periphery of the inner rotor bearing, a second portion extending from the first portion towards the core, the inner rotor bearing being configured to support the second portion; a third portion extending from an end of the second portion away from the first portion towards the support shaft, a second axial end of the inner rotor bearing being in contact with the third portion.

6. The direct drive electric motor of claim 5, 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.

7. The direct drive electric motor of claim 6, wherein, A portion of the axial end of the end cover is in contact with a first axial end of the inner rotor bearing.

8. The direct drive electric motor of claim 7, wherein, The support shaft has a shoulder protruding outward in a radial direction, the first axial end of the inner rotor bearing abutting against a second end of the shoulder.

9. The direct drive electric motor of claim 6, wherein, A portion of the inner rotor magnetic steel is fixed to the outer peripheral side wall of the inner rotor housing, another portion of the inner rotor magnetic steel being fixed to an outer peripheral side wall of the end cover.

10. The direct drive electric motor of claim 6, wherein, The inner rotor magnet extends no more than the inner rotor housing in the axial direction.

11. The direct drive electric motor of claim 6, wherein, There is a gap between the end cover and the inner rotor magnet.

12. The direct drive electric motor of claim 6, wherein, The fixing frame includes a hollow shaft, and the support shaft passes through a hollow portion of the hollow shaft.

13. The direct drive electric motor of claim 12, wherein, A second axial end of the inner rotor bearing abuts the hollow shaft.

14. The direct drive electric motor of claim 12, wherein, The iron core is fixed to the hollow shaft.

15. The direct drive electric motor of claim 1, wherein, The flux modulation block is formed of a magnetic conductive material, and the fixing frame is formed of a non-magnetic conductive material.

16. The direct drive electric motor of claim 15, wherein, The width of the flux modulation block is equal to the width of the fixing frame between two adjacent flux modulation blocks.

17. The direct drive electric motor of claim 8, wherein, The outer rotor assembly further includes an outer rotor magnet, which is opposite to the fixing frame in the radial direction, and the outer rotor magnet is fixed to the inner circumferential side wall of the outer rotor housing.

18. The direct drive electric motor of claim 17, wherein, The lengths of the inner rotor magnet, the outer rotor magnet, and the flux modulation block in the axial direction are equal.

19. The direct drive electric motor of claim 17, wherein, The outer rotor housing has a stepped portion protruding from the inner circumferential side wall of the outer rotor housing toward the axis, and one end of the outer rotor magnet is in contact with the stepped portion.

20. The direct drive electric motor of claim 17, wherein, The outer rotor assembly further includes an outer rotor bearing, which is fixed to the support shaft and configured to support the outer rotor housing, and the outer rotor bearing is closer to the first axial end of the direct drive motor than the inner rotor bearing.

21. The direct drive electric motor of claim 20, wherein, The axial end portion of the outer rotor housing has: 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, and the outer rotor bearing is configured to support the fifth portion; a sixth portion extending from one end of the fifth portion away from the fourth portion toward the support shaft, and a second axial end of the outer rotor bearing is in contact with the sixth portion.

22. The direct drive electric motor of claim 20, wherein, A portion of the axial end portion of the output shaft is in contact with the first axial end of the outer rotor bearing.

23. The direct drive electric motor of claim 20, wherein, The second axial end of the outer rotor bearing abuts the first end of the shoulder portion.

24. The direct drive electric motor of claim 20, wherein, The mounting hole between the output shaft and the outer rotor housing is aligned with the mounting hole between the end cover and the inner rotor housing.

25. The direct drive electric motor of claim 20, wherein, The inner rotor housing and the outer rotor housing are formed of a magnetic conductive material.

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