Double-rotor driving mechanism

Abstract

The invention relates to a double-rotor driving mechanism which comprises an outer rotor assembly which comprises a machine shell and an outer rotor arranged in the machine shell and is connected with a first load through the machine shell; the inner rotor assembly is provided with an inner rotor arranged in the outer rotor assembly and a rotating shaft penetrating through the inner rotor, at least one end of the rotating shaft extends out of the outer rotor assembly, and the rotating shaft is connected with a second load through the end; the stator assembly is provided with a stator fixed inside the outer rotor assembly, and the stator is located between the outer rotor and the inner rotor; and the shell is driven to rotate through electromagnetic induction between the stator and the outer rotor assembly so as to drive the first load to rotate, and / or the rotating shaft is driven to rotate through electromagnetic induction between the stator and the inner rotor assembly so as to drive the second load to rotate. The motor can drive the housing of the inner rotor assembly and the rotating shaft of the outer rotor assembly to rotate through the same group of stators, and can output two kinds of rotating power at different rotating speeds to respectively drive corresponding loads to rotate.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a dual-rotor drive mechanism. Background Art

[0002] In the prior art, a single motor can be used to drive a single shaft to rotate, which usually uses a rotor-shaft-bearing assembly method. The output operating conditions depend on the working characteristics of the motor, the efficiency range is single, and the applicability of the operating conditions is limited. To achieve dual-speed output, gear boxes, planetary gears, inner and outer shafts and other structural methods can be used to make a single motor drive two shafts to rotate, but it requires the establishment of additional redundant mechanisms such as gear boxes, planetary gears, inner and outer shafts, resulting in a complex structure; or two motors are used as prime movers to drive the shafts to rotate respectively, which will also bring about problems such as large equipment size, large weight, and high cost of use. Summary of the invention

[0003] The object of the present invention is to provide a dual-rotor drive mechanism, which can drive the housing of the inner rotor assembly and the shaft of the outer rotor assembly to rotate through the same set of stators, and can output two rotational powers with different speeds to respectively drive the corresponding loads to rotate.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A dual-rotor drive mechanism is provided, comprising:

[0006] An outer rotor assembly comprises a casing and an outer rotor disposed inside the casing, and connected to a first load through the casing;

[0007] An inner rotor assembly, comprising an inner rotor disposed inside the outer rotor assembly, and a rotating shaft passing through the inner rotor, wherein at least one end of the rotating shaft extends outside the outer rotor assembly and is connected to a second load through the end;

[0008] A stator assembly, comprising a stator fixed inside the outer rotor assembly, and the stator is located between the outer rotor and the inner rotor;

[0009] The casing is driven to rotate by electromagnetic induction between the stator and the outer rotor assembly to drive the first load to rotate, and / or the shaft is driven to rotate by electromagnetic induction between the stator and the inner rotor assembly to drive the second load to rotate.

[0010] Preferably, the housing and the shaft rotate in different directions.

[0011] Preferably, the housing and the shaft have different rotational speeds.

[0012] Preferably, the stator assembly further comprises a stator support assembly for fixing the stator, and the stator support assembly comprises:

[0013] A first support bearing, which is axially arranged inside the housing;

[0014] The first stator bracket includes a first support frame located inside the housing and a first support shaft having one end connected to the first support frame, and the first support frame is connected to the stator, and the first support bearing is sleeved on the outer circumference of the first support shaft.

[0015] Preferably, the stator support assembly further includes:

[0016] A second support bearing, which is axially arranged inside the housing;

[0017] The second stator bracket includes a second support frame located inside the housing and a second support shaft with one end connected to the second support frame, and the second support frame is connected to the stator, and the second support bearing is sleeved on the outer circumferential surface of the second support shaft.

[0018] Preferably, one end of the second support shaft not connected to the second support frame passes through the second support bearing in the axial direction and extends to the outside of the outer rotor assembly, and a wire hole for the winding coil lead to pass through is provided on the end.

[0019] Preferably, one or both of the first support frame and the second support frame are U-shaped structures and are connected to the stator through their open ends.

[0020] Preferably, a screw rod passes through the first support frame, the stator and the second support frame, and both ends of the screw rod cooperate with nuts to lock and fix the first support frame and the second support frame to the stator.

[0021] Preferably, the housing comprises:

[0022] A first shell having a first cavity structure formed therein;

[0023] and a second shell, a second cavity structure being formed inside the second shell;

[0024] The first shell and the second shell are detachably connected, and after the connection, the first cavity structure and the second cavity structure are interconnected.

[0025] Preferably, the dual-rotor driving mechanism further comprises: a rotating shaft supporting bearing, which is sleeved on the outer circumferential surface of the rotating shaft.

[0026] In summary, the present invention has the following beneficial effects compared with the prior art:

[0027] The driving mechanism in the present invention has a simple overall structure, a high degree of integration, and a small size. It can drive the casing of the inner rotor assembly and the rotating shaft of the outer rotor assembly to rotate through the same set of stators, and can output two rotational powers at different speeds to respectively drive the corresponding loads to rotate, thereby meeting the use requirements under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the overall structural diagram of the dual-rotor drive mechanism in the present invention.

[0029] Figure 2 It is a transverse cross-sectional view of the dual-rotor drive mechanism of the present invention.

[0030] Figure 3 It is a longitudinal sectional view of the dual-rotor drive mechanism of the present invention.

[0031] Figure 4 This is an overall structural diagram of the second stator bracket in the present invention.

[0032] Figure 5 It is a partial structural diagram of the first support frame, the second support frame and the stator in the present invention. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] like Figure 1-3 As shown, this embodiment provides a dual-rotor drive mechanism, which includes:

[0036] An outer rotor assembly, which is used to connect the first load; in this embodiment, the outer rotor assembly includes: a housing 1, which has an internal installation space 101 and is used to connect the first load; an outer rotor 2, which is arranged in the internal installation space 101 and is connected to the inner wall surface of the housing 1 by a non-detachable connection or a detachable connection such as bonding or welding;

[0037] An inner rotor assembly, comprising an inner rotor 5 arranged inside the outer rotor assembly (such as arranged inside the internal installation space 101), and a rotating shaft 7 passing through the inner rotor 5, wherein the outer circumferential surface of the rotating shaft 7 is connected to the inner wall surface of the inner rotor 5 by a non-detachable connection or a detachable connection such as bonding or welding, and at least one end of the rotating shaft 7 extends to the outside of the outer rotor assembly, and is connected to a second load through the end extending to the outside of the outer rotor assembly; for example, in this embodiment, the rotating shaft 7 has a first end 71 extending to the outside of the outer rotor assembly, and a second end 72 extending into the inside of the outer rotor assembly and passing through the inner rotor 5, the second end 72 is located inside the outer rotor assembly, or passes through the outer rotor assembly and extends to the outside of the outer rotor assembly, and at least the first end 71 can be connected to the second load through a structure such as a spline or a flat key; at the same time, in the radial direction, the inner rotor 5 is closer to the rotating shaft 7 than the outer rotor 2, that is, the distance between the rotating shaft 7 and the inner rotor 5 is smaller than the distance between the rotating shaft 7 and the outer rotor 2;

[0038] A stator assembly, comprising a stator 3 fixed inside the outer rotor assembly (such as disposed in the internal installation space 101), and the stator 3 is located between the outer rotor 2 and the inner rotor 5;

[0039] The housing 1, the rotating shaft 7, the inner rotor 5, the outer rotor 2, and the stator 3 are coaxially arranged;

[0040] The outer rotor assembly is driven to rotate by electromagnetic induction between the stator 3 and the outer rotor 2 to output a first rotational power, so as to drive the first load to rotate by the first rotational power, and / or the inner rotor assembly is driven to rotate by electromagnetic induction between the stator 3 and the inner rotor 5 to output a second rotational power, so as to drive the second load to rotate by the second rotational power.

[0041] Specifically, in this embodiment, the stator 3 includes a stator core, which can form a stator outer winding 31 that cooperates with the outer rotor 2 through an outer winding coil, and form a stator inner winding 32 that cooperates with the inner rotor 5 through an inner winding coil. The motor drive controller provides current to the stator outer winding 31 and the stator inner winding 32 respectively to generate an alternating magnetic field, further driving the housing 1 and the outer rotor 2 of the outer rotor assembly to rotate synchronously, and / or driving the rotating shaft 7 and the inner rotor 5 of the inner rotor assembly to rotate synchronously. At the same time, the motor drive controller The device can adjust the rotation direction and / or speed of the housing 1 and the outer rotor 2, as well as the rotation direction and / or speed of the shaft 7 and the inner rotor 5, so that the housing 1 and the shaft 7 can rotate in the same direction or in opposite directions, and the speeds of the outer rotor assembly and the inner rotor assembly are different, thereby outputting two rotational powers with different speeds at the same time, respectively driving the first load and the second load to rotate, so that the outer rotor assembly can drive the first load to rotate under low-speed and high-torque conditions, and / or the inner rotor assembly can drive the second load to rotate under high-speed and low-torque conditions.

[0042] Furthermore, the inner rotor 5 comprises:

[0043] The inner rotor yoke 51 and a plurality of inner rotor permanent magnets 52 arranged around the outer side of the inner rotor yoke 51. In this embodiment, the inner rotor permanent magnets 52 can be directly connected to the outer peripheral surface of the inner rotor yoke 51, or embedded in a groove structure arranged on the outer side of the inner rotor yoke 51, as long as it can fix the position of the inner rotor permanent magnets 52.

[0044] The outer rotor 2 comprises:

[0045] The outer rotor yoke 21 and a plurality of outer rotor permanent magnets 22 circumferentially arranged on the inner side of the outer rotor yoke 21. In this embodiment, the outer rotor permanent magnets 22 can be directly connected to the inner circumferential surface of the outer rotor yoke 21, or embedded in a groove structure arranged on the inner side of the outer rotor yoke 12, as long as the position of the outer rotor permanent magnets 22 can be fixed.

[0046] Furthermore, the number of pole pairs P of the inner rotor permanent magnet 52 is inPM The number of pole pairs P of the stator inner winding 32 inW Equal, that is, P inPM =P inW , the number of external teeth of stator 3 is N outT and the number of pole pairs P of the outer rotor permanent magnet 22 outPM The number of pole pairs P of the stator outer winding 31 outW The following relationship is satisfied: outT ±P outW =P outPMThe stator outer teeth refer to the part between adjacent stator outer windings 31. The motor drive controller provides current to the stator outer winding 31 and the stator inner winding 32 respectively. The outer rotor 2 works in a low-speed condition according to the working mode of the permanent magnet vernier motor, and the inner rotor 5 works in a high-speed condition according to the working mode of the traditional permanent magnet motor.

[0047] In this embodiment, by adopting the traditional permanent magnet synchronous motor topology between the inner rotor 5 and the stator 3, the inner rotor 5 and the stator 3 meet the principle of equal magnetic poles, thereby realizing the function of medium and high speed drive output of the conventional permanent magnet motor, and by integrating the topology of the permanent magnet vernier motor, the outer rotor 2 and the stator 3 meet the specific vernier effect magnetic circuit relationship, thereby realizing the function of low-speed and high-torque output.

[0048] Furthermore, integrating the vernier effect on the outer rotor 2 can reduce the process difficulties caused by the pasting of multi-pole permanent magnets. At the same time, designing the inner rotor 5 as a traditional permanent magnet motor topology structure can meet the requirements for rotor dynamic balance during high-speed operation. Therefore, the inner and outer rotors in this embodiment can both operate in a high-efficiency range within the range of their respective mechanical characteristics, thereby achieving high-efficiency operation under low-speed and high-speed conditions at the same time.

[0049] Therefore, the dual-rotor drive mechanism in this embodiment has a high degree of integration and a small size. It can drive the casing of the inner rotor assembly and the shaft of the outer rotor assembly to rotate through the same set of stators, and can output two rotational powers at different speeds to drive the corresponding loads to rotate respectively, so as to meet the use requirements under different working conditions.

[0050] Embodiment 2:

[0051] The difference between this embodiment and embodiment 1 is that Figure 3 As shown, the stator assembly further includes a stator support assembly for fixing the stator 3, and the stator support assembly includes:

[0052] A first support bearing 9 is axially arranged inside the housing 1 of the outer rotor assembly; for example, in this embodiment, the first support bearing 9 can be installed in a first bearing chamber 102 axially opened on the housing 1, and connected to the housing 1 by bonding or the like;

[0053] The first stator bracket 8 comprises a first support frame 81 located in the internal installation space 101 of the housing 1 and a first support shaft 82 connected to the first support frame 81 at one end, and the first support frame 81 is detachably connected to the stator 3, the first support bearing 9 is sleeved on the outer circumferential surface of the first support shaft 82, and the end of the first support shaft 82 not connected to the first support frame 81 extends into the first support bearing 9 in the axial direction, or passes through the first support bearing 9; at the same time, the first support frame 81 and the first support shaft 82 can be integrally formed;

[0054] A second support bearing 9' is axially arranged inside the housing 1 of the outer rotor assembly; for example, in this embodiment, the second support bearing 9' can be installed in a second bearing chamber 102' axially opened on the housing 1, and connected to the housing 1 by bonding or the like;

[0055] The second stator bracket 4 comprises a second support frame 41 located in the internal installation space 101 of the housing 1 and a second support shaft 42 connected to the second support frame 41 at one end, and the second support frame 41 is detachably connected to the stator 3, the second support bearing 9' is sleeved on the outer circumferential surface of the second support shaft 42, and the end of the second support shaft 42 not connected to the second support frame 41 passes through the second support bearing 9' in the axial direction and extends to the outside of the outer rotor assembly, and as Figure 4 As shown, the second support frame 41 and / or the second support shaft 42 are provided with wire holes 43 for the winding coil lead wires to pass through. Preferably, at least one wire hole 43 is provided on the portion of the second support shaft 42 extending outside the outer rotor assembly, thereby connecting the lead wires to the external structure; at the same time, the second support frame 41 and the second support shaft 42 can be integrally formed;

[0056] Furthermore, the first end 71 of the rotating shaft 7 is located outside the rotor assembly, and the second end 72 extends into the interior of the casing 1, and after passing through the first support frame 81, the first support shaft 82, the inner rotor 5, and the second support frame 41, extends into the second support shaft 42, and the casing 1, the rotating shaft 7, the inner rotor 5, the outer rotor 2, the stator 3, the first support bearing 9', the first support shaft 42, the second support bearing 9, and the second support shaft 82 are coaxially arranged.

[0057] Embodiment 3:

[0058] The difference between this embodiment and embodiment 1 or 2 is that one or both of the first support frame 81 and the second support frame 41 are U-shaped structures, and are detachably connected to the stator 3 through their open ends. Figure 5As shown in FIG9 , further, a gasket structure such as a spring washer 11 and a flat washer 12 may be sleeved on the screw rod 13 , thereby adjusting the position of the nut 10 on the screw rod 13 .

[0059] Meanwhile, the housing 1 in this embodiment includes:

[0060] A first housing 11, wherein a first cavity structure 111 is formed inside thereof, and a first bearing chamber 102 for mounting the first bracket support bearing 9 is opened along the axial direction;

[0061] and a second housing 12, wherein a second cavity structure 121 is formed inside the second housing, and a second bearing chamber 102' for mounting the second bracket support bearing 9' is axially opened;

[0062] The first shell 11 and the second shell 12 are detachably connected by structures such as bolts and nuts, and after the connection, the first cavity structure 111 and the second cavity structure 121 are interconnected to form the internal installation space 101.

[0063] Embodiment 4:

[0064] The difference between this embodiment and any one of embodiments 1-4 is that Figure 3 As shown, the dual-rotor drive mechanism also includes:

[0065] The rotating shaft support bearing 6 is sleeved on the outer circumferential surface of the rotating shaft 7; in this embodiment, there are at least two rotating shaft support bearings 6, and at least one rotating shaft support bearing 6 is installed inside the first support shaft 82, and at least one rotating shaft support bearing 6 is installed inside the second support shaft 42, thereby supporting different positions of the rotating shaft 7 to ensure smooth rotation of the rotating shaft.

[0066] In summary, the present invention provides a specific dual-rotor drive mechanism, which can drive the casing of the inner rotor assembly and the shaft of the outer rotor assembly to rotate through the same set of stators, and can output two rotational powers with different speeds to respectively drive the corresponding loads to rotate. The drive mechanism has a simple overall structure, a high degree of integration, and a small size, and can meet the use requirements under different working conditions.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual-rotor drive mechanism, characterized in that: include: An outer rotor assembly comprises a casing and an outer rotor disposed inside the casing, and connected to a first load through the casing; An inner rotor assembly, comprising an inner rotor disposed inside the outer rotor assembly, and a rotating shaft passing through the inner rotor, wherein at least one end of the rotating shaft extends outside the outer rotor assembly and is connected to a second load through the end; A stator assembly, comprising a stator fixed inside the outer rotor assembly, and the stator is located between the outer rotor and the inner rotor; The casing is driven to rotate by electromagnetic induction between the stator and the outer rotor assembly to drive the first load to rotate, and / or the shaft is driven to rotate by electromagnetic induction between the stator and the inner rotor assembly to drive the second load to rotate.

2. The dual-rotor drive mechanism according to claim 1, characterized in that: The housing and the rotating shaft have different rotation directions.

3. The dual-rotor drive mechanism according to claim 1, characterized in that: The rotating speeds of the casing and the rotating shaft are different.

4. The dual-rotor drive mechanism according to claim 1, characterized in that: The stator assembly further includes a stator support assembly for fixing the stator, and the stator support assembly includes: A first support bearing, which is axially arranged inside the housing; The first stator bracket includes a first support frame located inside the housing and a first support shaft having one end connected to the first support frame, and the first support frame is connected to the stator, and the first support bearing is sleeved on the outer circumference of the first support shaft.

5. The dual-rotor drive mechanism according to claim 4, characterized in that: The stator support assembly further comprises: A second support bearing, which is axially arranged inside the housing; The second stator bracket includes a second support frame located inside the housing and a second support shaft with one end connected to the second support frame, and the second support frame is connected to the stator, and the second support bearing is sleeved on the outer circumferential surface of the second support shaft.

6. The dual-rotor drive mechanism according to claim 5, characterized in that: One end of the second support shaft not connected to the second support frame passes through the second support bearing in the axial direction and extends to the outside of the outer rotor assembly, and a wire hole for the winding coil lead to pass through is opened on the end.

7. The dual-rotor drive mechanism according to claim 4, characterized in that: One or both of the first support frame and the second support frame are U-shaped structures and are connected to the stator through their open ends.

8. The dual-rotor drive mechanism according to claim 7, characterized in that: The screw rod passes through the first support frame, the stator and the second support frame, and both ends of the screw rod cooperate with nuts to lock and fix the first support frame and the second support frame on the stator.

9. The dual-rotor drive mechanism according to claim 1, characterized in that: The housing comprises: A first shell having a first cavity structure formed therein; and a second shell, a second cavity structure being formed inside the second shell; The first shell and the second shell are detachably connected, and after the connection, the first cavity structure and the second cavity structure are interconnected.

10. The dual-rotor drive mechanism according to claim 1, characterized in that: The dual-rotor drive mechanism further comprises: The rotating shaft supporting bearing is sleeved on the outer peripheral surface of the rotating shaft.

Images