Cogging-free double-rotor motor

Abstract

The invention provides a cogging-free dual-rotor motor. The cogging-free dual-rotor motor comprises a shell, a central shaft, a first stator, a first rotor, a first output shaft, a first bearing, a second stator, a second rotor, a second output shaft, a second bearing and a linear moving part, the moving output end of the linear moving part is connected with the central shaft; the second rotor is of an annular structure and rotationally sleeves the central shaft; the second output shaft is of a sleeve structure, the second output shaft is rotationally connected to the front end of the center shaft in a sleeving mode through a second bearing, the second output shaft is in transmission connection with the second rotor, and the second output shaft is in sliding fit with the second rotor in the axial direction; the first rotor is of an annular structure and rotationally sleeves the second rotor; the first output shaft is of a sleeve structure, the second output shaft is rotationally sleeved with the first output shaft through a first bearing, the first output shaft is in transmission connection with the first rotor, and the first output shaft is in sliding fit with the first rotor in the axial direction. According to the motor, the axial distance of the double output shafts is adjustable, and the scene application flexibility is improved.

Description

Technical Field

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

[0002] Existing dual-rotor motors have dual-shaft outputs. Some use a single motor as the power source and adopt mechanical conversion methods such as gearboxes to achieve dual-shaft output. There is a certain relationship between the torque and speed of the two shafts, and independent operation cannot be achieved; while some use independent dual motors as the power source. The two output shafts are completely independent and can achieve co-directional rotation or counter-rotation. However, the axial direction of the output shaft is usually fixed, that is, the output shaft can only rotate, and its axial distance is difficult to adjust, which greatly limits the application scenarios of the dual-shaft output motor. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that the axial distance between the dual output shafts of a dual-rotor motor is difficult to adjust, which limits the application scenarios of the motor. In order to overcome the above defects of the prior art, the present invention provides a slotless dual-rotor motor.

[0004] The present invention provides a slotless dual-rotor motor, comprising a housing, a central shaft, a first stator, a first rotor, a first output shaft, a first bearing, a second stator, a second rotor, a second output shaft, a second bearing, and a linear motion component; the central shaft is axially movable and penetrates the housing, the linear motion component is installed in the housing, and the movable output end of the linear motion component is connected to the central shaft; the second rotor has an annular structure and is rotatably sleeved on the central shaft, the second stator is fixed in the housing and is used to drive the second rotor to rotate; the second output shaft has a sleeve structure, is rotatably sleeved on the front end of the central shaft through a second bearing, is transmission-connected to the second rotor, and is axially slidably fitted on the second rotor; the first rotor has an annular structure and is rotatably sleeved on the second rotor, the first stator is fixed in the housing and is used to drive the first rotor to rotate; the first output shaft has a sleeve structure, is rotatably sleeved on the second output shaft through a first bearing, is transmission-connected to the first rotor, and is axially slidably fitted on the first rotor.

[0005] Compared with the prior art, the slotless dual-rotor motor disclosed in the present application has the following advantages: the first stator drives the first rotor to rotate, the first rotor drives the first output shaft to rotate, the second stator drives the second rotor to rotate, the second rotor drives the second output shaft to rotate, the first output shaft and the second output shaft rotate through bearings, and the first output shaft and the second output shaft are both arranged in a sleeve structure and coaxially sleeved to achieve independent rotation of the dual output shafts, and its structure is compact, which is conducive to miniaturization of the motor; by setting a linear moving component, the linear moving component drives the central shaft to move, and the central shaft drives the first output shaft and the second output shaft to move axially, that is, the axial distance of the output shafts can be adjusted, thereby improving the flexibility of scene applications of the dual-shaft output motor.

[0006] In one possible embodiment, the linear moving component includes a third stator and a third rotor, the third rotor is rotatably screwed on the central shaft, the third stator is fixed in the housing and is used to drive the third rotor to rotate, and an anti-rotation portion is provided between the central shaft and the housing to prevent the central shaft from rotating.

[0007] Compared with the existing technology, the above technical solution can realize that the linear moving component drives the central axis to move axially, and the structure is stable and the driving is reliable.

[0008] In a possible implementation manner, the anti-rotation portion includes an anti-rotation block disposed on the central axis, and the housing is provided with an anti-rotation through groove for the anti-rotation block to be matched and inserted into.

[0009] Compared with the existing technology, the above technical solution can prevent the central shaft from rotating and improve the axial movement stability of the central shaft.

[0010] In a possible implementation manner, a plurality of heat pipes are further included, wherein the heat pipes connect the housing, the first stator, the second stator, and the third stator to each other through thermal conduction.

[0011] Compared with the existing technology, the above technical solution can facilitate the heat dissipation of the stator, increase the heat dissipation capacity of the winding, and improve the power density of the motor.

[0012] In a possible embodiment, an outer wall of the first output shaft is provided with a first protrusion extending in the axial direction, and an inner wall of the first rotor is provided with a first groove extending in the axial direction, and the first protrusion is fitted and inserted into the first groove.

[0013] Compared with the existing technology, the above technical solution can realize that the first rotor drives the first output shaft to rotate, and the transmission is stable and reliable.

[0014] In a possible embodiment, the outer wall of the second output shaft is provided with a second protrusion extending in the axial direction, the inner wall of the second rotor is provided with a second groove extending in the axial direction, and the second protrusion is fitted and inserted into the second groove.

[0015] Compared with the existing technology, the above technical solution can realize that the second rotor drives the second output shaft to rotate, and the transmission is stable and reliable.

[0016] In a possible embodiment, the first stator, the second stator and the third stator each include a plurality of segmented stators, which are spliced ​​together into a ring structure. Each segmented stator includes a slotless stator core block, two back windings and an inner winding. The two back windings are respectively arranged on both sides of the slotless stator core block, and each inner winding is arranged between two adjacent slotless stator core blocks.

[0017] Compared with the existing technology, the above technical solution can make the motor free of cogging force, the output is more stable, the torque fluctuation is smaller, the cogging-free structure does not have to worry about magnetic saturation problems, and the overload capacity is stronger.

[0018] In a possible implementation manner, the ratio of the number of segmented stators to the number of rotor poles is 3:2.

[0019] Compared with the existing technology, the above technical solution can limit the number of segmented stators and the ratio of the number of rotor poles, thereby improving the stability of the motor.

[0020] In one possible embodiment, the inner ring of the first bearing is interference fit on the outer wall of the second output shaft, and the outer ring of the first bearing is fixedly connected to the inner wall of the first output shaft; the inner ring of the second bearing is interference fit on the outer wall of the center shaft, and the outer ring of the second bearing is fixedly connected to the inner wall of the second output shaft.

[0021] Compared with the prior art, the above technical solution can realize that the central shaft drives the first output shaft and the second output shaft to move in the axial direction.

[0022] In one possible embodiment, a first copper sleeve is provided between the first output shaft and the first rotor, the inner ring of the first copper sleeve is slidably fitted on the outer wall of the first output shaft, and the outer ring of the first copper sleeve is fixedly connected to the inner wall of the first rotor; a second copper sleeve is provided between the second output shaft and the second rotor, the inner ring of the second copper sleeve is slidably fitted on the outer wall of the second output shaft, and the outer ring of the second copper sleeve is fixedly connected to the inner wall of the second rotor.

[0023] Compared with the prior art, the above technical solution can achieve axial sliding fit of the first output shaft on the first rotor and axial sliding fit of the second output shaft on the second rotor, thereby improving the stability of the output shaft movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 for Figure 2 A partial enlarged view of Figure 4 is a schematic structural diagram of the first rotor; Figure 5 is a structural schematic diagram of the first output shaft; Figure 6 is a schematic structural diagram of the second rotor; Figure 7 is a structural schematic diagram of the second output shaft; Figure 8 It is a structural diagram of the anti-rotation block; Figure 9 Schematic diagram of the structure of the rear end cover; Figure 10 Schematic diagram of the structure inside the casing; Figure 11 for Figure 10 Side view of Figure 12 Schematic diagram of the structure of the slotless stator core block; Figure 13 It is a structural diagram of the back winding; Figure 14 It is a structural diagram of the inner winding; Description of reference numerals: 1. Housing; 11. Front cover; 12. Casing; 13. Rear cover; 2. Center shaft; 21. Anti-rotation block; 3. First stator; 4. First rotor; 41. First groove; 5. First output shaft; 51. First protrusion; 6. First bearing; 7. Second stator; 8. Second rotor; 81. Second groove; 9. Second output shaft; 91. Second protrusion; 10. Second bearing; 20. Third stator; 30. Third rotor; 40. Anti-rotation groove; 50. Heat pipe; 60. Block stator; 601. Slotless stator core block; 602. Back winding; 603. Inner winding; 70. First copper sleeve; 80. Second copper sleeve. DETAILED DESCRIPTION

[0025] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Those skilled in the art may adjust them as needed to suit specific application scenarios.

[0026] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0027] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] See also Figures 1 to 14 The embodiment of the present application discloses a slotless dual-rotor motor, comprising a housing 1, a central shaft 2, a first stator 3, a first rotor 4, a first output shaft 5, a first bearing 6, a second stator 7, a second rotor 8, a second output shaft 9, a second bearing 10, and a linear moving component; the central shaft 2 is axially movable and penetrates the housing 1, the linear moving component is installed in the housing 1, and the moving output end of the linear moving component is connected to the central shaft 2; the second rotor 8 is annular and rotatably sleeved on the central shaft 2, the second stator 7 is fixed in the housing 1 and is used to drive the second rotor 8 to rotate; the second output shaft 9 is a sleeve structure. The second output shaft 9 is rotatably sleeved on the front end of the central shaft 2 through a second bearing 10. The second output shaft 9 is transmission-connected to the second rotor 8, and the second output shaft 9 axially slides on the second rotor 8; the first rotor 4 has an annular structure and is rotationally sleeved on the second rotor 8, and the first stator 3 is fixed in the housing 1 and is used to drive the first rotor 4 to rotate; the first output shaft 5 has a sleeve structure, and the first output shaft 5 is rotatably sleeved on the second output shaft 9 through a first bearing 6. The first output shaft 5 is transmission-connected to the first rotor 4, and the first output shaft 5 axially slides on the first rotor 4.

[0030] As can be seen from the above, the first stator 3 drives the first rotor 4 to rotate, the first rotor 4 drives the first output shaft 5 to rotate, the second stator 7 drives the second rotor 8 to rotate, the second rotor 8 drives the second output shaft 9 to rotate, the first output shaft 5 and the second output shaft 9 rotate through bearings, and the first output shaft 5 and the second output shaft 9 are both arranged in a sleeve structure and coaxially sleeved to realize independent rotation of the dual output shafts, which can rotate in the same direction or in opposite directions, and its structure is compact, which is conducive to miniaturization of the motor; by setting a linear moving component, the linear moving component drives the central shaft 2 to move, and the central shaft 2 drives the first output shaft 5 and the second output shaft 9 to move axially, that is, the axial distance of the output shafts can be adjusted, which improves the flexibility of the dual-axis output motor in scene applications.

[0031] Continue to see Figure 2 In this embodiment, the shell 1 includes a front cover 11, a casing 12 and a rear cover 13. The casing 12 is connected between the front cover 11 and the rear cover 13. The front end of the central axis 2 passes through the front cover 11, and the rear end of the central axis 2 passes through the rear cover 13.

[0032] In this embodiment, the linear moving component includes a third stator 20 and a third rotor 30. The third rotor 30 is rotatably screwed on the central shaft 2. The third stator 20 is fixed in the housing 1 and is used to drive the third rotor 30 to rotate. An anti-rotation portion is provided between the central shaft 2 and the housing 1 to prevent the central shaft 2 from rotating. This enables the linear moving component to drive the central shaft 2 to move axially, with a stable structure and reliable drive. Specifically, the anti-rotation portion includes an anti-rotation block 21 provided on the central shaft 2, and the rear end cover 13 is provided with an anti-rotation groove 40 for the anti-rotation block 21 to be matched and inserted. The rotatable screw connection is the screw connection between the screw and the nut in the prior art. The central shaft 2, the first rotor 4, the first output shaft 5, the second rotor 8, the second output shaft 9, and the third rotor 30 are all coaxially arranged.

[0033] Continue to see Figure 10 and Figure 11 In this embodiment, the housing 1 further includes a plurality of heat pipes 50, which connect the housing 1, the first stator 3, the second stator 7, and the third stator 20 to each other by thermal conduction. That is, after the heat pipes 50 pass through the first stator 3, the second stator 7, and the third stator 20, their two ends are respectively connected to the front cover 11 and the rear cover 13, thereby facilitating the heat dissipation of the stator, increasing the heat dissipation capacity of the winding, and improving the power density of the motor.

[0034] In this embodiment, the outer wall of the first output shaft 5 is provided with a first protrusion 51 extending along the axial direction, and the inner wall of the first rotor 4 is provided with a first groove 41 extending along the axial direction. The first protrusion 51 is fitted and inserted into the first groove 41, thereby enabling the first rotor 4 to drive the first output shaft 5 to rotate, and the transmission is stable and reliable.

[0035] In this embodiment, the outer wall of the second output shaft 9 is provided with a second protrusion 91 extending along the axial direction, and the inner wall of the second rotor 8 is provided with a second groove 81 extending along the axial direction. The second protrusion 91 is inserted into the second groove 81, thereby enabling the second rotor 8 to drive the second output shaft 9 to rotate, and the transmission is stable and reliable.

[0036] Continue to see Figures 11 to 14 In this embodiment, the first stator 3, the second stator 7 and the third stator 20 all include a plurality of segmented stators 60, and the plurality of segmented stators 60 are spliced ​​together to form a ring structure. Each segmented stator 60 includes a slotless stator core block 601, two back windings 602, and an inner winding 603. The two back windings 602 are respectively arranged on both sides of the slotless stator core block 601, and each inner winding 603 is arranged between two adjacent slotless stator core blocks 601. This can make the motor free of cogging force, the output more stable, the torque fluctuation smaller, the slotless structure does not have to worry about magnetic saturation problems, and has a stronger overload capacity. Specifically, the windings of the first stator 3, the second stator 7, and the third stator 20 are arranged cyclically on the inner circle of the slotless stator core block 601 in a phase sequence of...-A, +B, -C, +A, -B, +C...; the ratio of the number of the segmented stators 60 to the number of rotor poles is 3:2.

[0037] In this embodiment, the first rotor 4 , the second rotor 8 , and the third rotor 30 are respectively provided with permanent magnets, and the magnetic poles of the permanent magnets are alternately changed between N and S poles in the circumferential direction.

[0038] In this embodiment, the inner ring of the first bearing 6 is interference fit on the outer wall of the second output shaft 9, and the outer ring of the first bearing 6 is fixedly connected to the inner wall of the first output shaft 5; the inner ring of the second bearing 10 is interference fit on the outer wall of the center shaft 2, and the outer ring of the second bearing 10 is fixedly connected to the inner wall of the second output shaft 9, thereby enabling the center shaft 2 to drive the first output shaft 5 and the second output shaft 9 to move axially.

[0039] In this embodiment, a first copper sleeve 70 is provided between the first output shaft 5 and the first rotor 4. The inner ring of the first copper sleeve 70 slides with the outer wall of the first output shaft 5, while the outer ring of the first copper sleeve 70 is fixedly connected to the inner wall of the first rotor 4. A second copper sleeve 80 is provided between the second output shaft 9 and the second rotor 8. The inner ring of the second copper sleeve 80 slides with the outer wall of the second output shaft 9, while the outer ring of the second copper sleeve 80 is fixedly connected to the inner wall of the second rotor 8. This allows the first output shaft 5 to axially slide with the first rotor 4, and the second output shaft 9 to axially slide with the second rotor 8, thereby improving the stability of the output shaft movement. The first and second copper sleeves 70, 80 prevent the first and second output shafts 5, 9 from dislodging from the central shaft 2.

[0040] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0041] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0042] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A slotless dual-rotor motor, characterized in that: The invention comprises a housing (1), a central shaft (2), a first stator (3), a first rotor (4), a first output shaft (5), a first bearing (6), a second stator (7), a second rotor (8), a second output shaft (9), a second bearing (10) and a linear moving component; the central shaft (2) is axially movable and penetrates the housing (1); the linear moving component is installed in the housing (1); the moving output end of the linear moving component is connected to the central shaft (2); the second rotor (8) is annular and rotatably sleeved on the central shaft (2); the second stator (7) is fixed in the housing (1) and is used to drive the second rotor (8) to rotate; the second output shaft (9) is a sleeve structure; the second output shaft (9) The second output shaft (9) is rotatably sleeved on the front end of the central shaft (2) through a second bearing (10), and is transmission-connected to the second rotor (8), and the second output shaft (9) is axially slidably fitted on the second rotor (8); the first rotor (4) is annular in structure and rotationally sleeved on the second rotor (8); the first stator (3) is fixed in the housing (1) and is used to drive the first rotor (4) to rotate; the first output shaft (5) is a sleeve structure, and the first output shaft (5) is rotatably sleeved on the second output shaft (9) through a first bearing (6), and the first output shaft (5) is transmission-connected to the first rotor (4), and the first output shaft (5) is axially slidably fitted on the first rotor (4).

2. The slotless dual-rotor motor according to claim 1, characterized in that: The linear moving component comprises a third stator (20) and a third rotor (30); the third rotor (30) is rotatably screwed onto the central shaft (2); the third stator (20) is fixed in the housing (1) and is used to drive the third rotor (30) to rotate; an anti-rotation portion for preventing the central shaft (2) from rotating is provided between the central shaft (2) and the housing (1).

3. The slotless dual-rotor motor according to claim 2, characterized in that: The anti-rotation portion comprises an anti-rotation block (21) arranged on the central shaft (2), and the housing (1) is provided with an anti-rotation through groove (40) for the anti-rotation block (21) to be matched and inserted.

4. The slotless dual-rotor motor according to claim 2, characterized in that: It also includes a plurality of heat pipes (50), wherein the heat pipes (50) connect the housing (1), the first stator (3), the second stator (7) and the third stator (20) to each other through thermal conduction.

5. The slotless dual-rotor motor according to claim 1, characterized in that: The outer wall of the first output shaft (5) is provided with a first protrusion (51) extending in the axial direction, and the inner wall of the first rotor (4) is provided with a first groove (41) extending in the axial direction, and the first protrusion (51) is inserted into the first groove (41).

6. The slotless dual-rotor motor according to claim 1, characterized in that: The outer wall of the second output shaft (9) is provided with a second protrusion (91) extending in the axial direction, and the inner wall of the second rotor (8) is provided with a second groove (81) extending in the axial direction, and the second protrusion (91) is inserted into the second groove (81).

7. The slotless dual-rotor motor according to claim 2, characterized in that: The first stator (3), the second stator (7) and the third stator (20) all include a plurality of segmented stators (60), the plurality of segmented stators (60) are spliced ​​around to form a ring structure, each segmented stator (60) includes a slotless stator core block (601), two back windings (602) and an inner winding (603), the two back windings (602) are respectively arranged on both sides of the slotless stator core block (601), and each inner winding (603) is arranged between two adjacent slotless stator core blocks (601).

8. The slotless dual-rotor motor according to claim 7, characterized in that: The ratio of the number of segmented stators (60) to the number of rotor poles is 3:

2.

9. The slotless dual-rotor motor according to claim 1, characterized in that: The inner ring of the first bearing (6) is interference-fitted on the outer wall of the second output shaft (9), and the outer ring of the first bearing (6) is fixedly connected to the inner wall of the first output shaft (5); the inner ring of the second bearing (10) is interference-fitted on the outer wall of the central shaft (2), and the outer ring of the second bearing (10) is fixedly connected to the inner wall of the second output shaft (9).

10. The slotless dual-rotor motor according to claim 1, characterized in that: A first copper sleeve (70) is provided between the first output shaft (5) and the first rotor (4), the inner ring of the first copper sleeve (70) is slidably fitted on the outer wall of the first output shaft (5), and the outer ring of the first copper sleeve (70) is fixedly connected to the inner wall of the first rotor (4); a second copper sleeve (80) is provided between the second output shaft (9) and the second rotor (8), the inner ring of the second copper sleeve (80) is slidably fitted on the outer wall of the second output shaft (9), and the outer ring of the second copper sleeve (80) is fixedly connected to the inner wall of the second rotor (8).

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