Double-rotor motor and clothes dryer

Abstract

The double-rotor motor comprises a stator and an axial end cover, the stator comprises a stator iron core, the stator iron core comprises a plurality of outer winding grooves and a plurality of inner winding grooves, and the outer winding grooves and the inner winding grooves respectively form an outer magnetic field and an inner magnetic field after being wound with stator windings. The axial end face of the stator iron core is provided with a plurality of plug-in grooves which are circumferentially arranged around the central axis of the stator iron core and located between the outer winding groove and the inner magnetic field in a penetrating mode, and the end face, facing the stator iron core, of the axial end cover is provided with a plurality of plug-in parts matched with the plug-in grooves. And a magnetic resistance air gap positioned between the external magnetic field and the internal magnetic field is formed between the inserting part and the inserting groove. The motor is stable in output, can be locally maintained, and is simple and convenient to assemble.

Description

Technical Field

[0001] The present invention relates to a dual-rotor motor and a clothes dryer, belonging to the technical field of motors. Background Art

[0002] Among various types of motors, the dual-rotor motor has attracted much attention due to its unique structure. Its stator core is usually connected to the end cover on the axial side of the stator core through fixing components such as bolts. Such a design realizes the detachability of the stator, and when the stator is damaged, it can be removed for partial repair, such as replacing the winding.

[0003] At the same time, the dual-rotor motor is provided with inner and outer stator slots on the stator core, and stator windings are arranged in the corresponding slots to form inner and outer two magnetic fields. A magnetic field suppression component can be arranged between the two magnetic fields to suppress the mutual interference between the inner and outer two magnetic fields, thereby ensuring the output stability and efficiency of the dual-rotor motor. However, this also increases the complexity of the motor assembly and affects the assembly efficiency of the motor to a certain extent. Summary of the Invention

[0004] One of the purposes of this application is to provide a dual-rotor motor with stable output, capable of local repair and simple assembly.

[0005] A dual-rotor motor includes a stator and an axial end cover. The stator includes a stator core. The stator core includes a plurality of outer stator slots and a plurality of inner stator slots. After the outer stator slots and the inner stator slots are wound with stator windings, an outer magnetic field and an inner magnetic field are respectively formed. A plurality of insertion slots are arranged through the axial end face of the stator core in a circumferential arrangement around the central axis of the stator core and are located between the outer stator slots and the inner stator slots. The end face of the axial end cover facing the stator core is provided with a plurality of insertion parts that cooperate with the plurality of insertion slots. Moreover, a magnetic field blocking air gap located between the outer magnetic field and the inner magnetic field is formed between the insertion part and the insertion slot.

[0006] Preferably, the insertion part includes a plurality of insertion unit bodies arranged at intervals around the central axis of the axial end cover, and a magnetic field blocking air gap is formed between adjacent two insertion unit bodies and the insertion slot.

[0007] Preferably, a magnetic field blocking air gap is formed between the radial outer wall of the insertion part and the radial outer wall of the corresponding insertion slot, or a magnetic field blocking air gap is formed between the radial inner wall of the insertion part and the radial inner wall of the corresponding insertion slot.

[0008] Preferably, the magnetic permeability of the insertion part is less than that of the stator core, or a magnetic field blocking layer with a magnetic permeability less than that of the stator core is arranged on the surface of the insertion part.

[0009] Preferably, the stator further includes two stator wire frames arranged at both axial ends of the stator core; The stator wire frame includes a yoke fitting ring, a plurality of outer insulation parts arranged on the outer circumference of the yoke fitting ring, and a plurality of inner insulation parts arranged on the inner circumference of the yoke fitting ring.

[0010] Preferably, a relief groove for the insertion part is provided on the yoke fitting ring; an axial gap is provided between the stator wire frame and the corresponding axial end cover, and the axial gap, the relief groove and the magnetic resistance air gap together form a connected air flow channel.

[0011] Preferably, the yoke fitting ring is connected to the stator core through a metal connecting piece; an outer insulation ring and an inner insulation ring are also provided on the stator wire frame, the outer insulation ring is located between the outer stator slot and the metal connecting piece, and the inner insulation ring is located between the inner stator slot and the metal connecting piece.

[0012] Preferably, the end of the metal connecting piece axially protrudes from the outer insulation ring and the inner insulation ring and forms a positioning end; the positioning end is used to limit the insertion depth of the axial end cover to obtain the axial gap.

[0013] A dryer includes the double-rotor motor in any of the above technical solutions.

[0014] In summary, the present invention has the following beneficial effects: 1: In the double-rotor motor of the present invention, the axial end cover and the stator core are connected through the insertion part and the insertion slot, and a magnetic resistance air gap located between the outer magnetic field and the inner magnetic field is formed between the insertion part and the corresponding insertion slot. The magnetic resistance air gap is used to replace the magnetic suppression component in the prior art to suppress the mutual interference between the inner and outer magnetic fields. Compared with the prior art, while ensuring the stable output of the motor, the installation of the magnetic suppression component is omitted, the assembly of the motor is simplified, and at the same time, the plug-in connection method can ensure that the stator of the motor can be removed for local maintenance, thereby effectively reducing the maintenance cost of the motor.

[0015] 2: In the double-rotor motor of the present invention, an axial gap is provided between the stator wire frame and the corresponding axial end cover, and the axial gap, the relief groove on the stator wire frame, and the magnetic resistance air gap formed by the insertion slot and the insertion part together form a connected air flow channel, so that external air can smoothly enter the motor interior, thereby effectively reducing the temperature of the motor during operation, greatly improving the heat dissipation performance of the motor, and ensuring that the motor operates in a highly efficient and stable state.

[0016] 3: In the double-rotor motor of the present invention, the end of the metal connecting piece for installing the stator wire frame axially protrudes from the outer insulation ring and the inner insulation ring of the stator wire frame to form a positioning end. During the process of assembling the axial end cover onto the stator core, the positioning end precisely limits the insertion depth of the axial end cover, so that the required axial gap can be easily obtained. This design not only improves the assembly accuracy but also makes the overall assembly process of the motor more convenient and efficient. Brief Description of the Drawings

[0017] Figure 1 is a schematic structural view of a dual-rotor motor; Figure 2 is Figure 1 an exploded view of the dual-rotor motor in Figure 3 is Figure 1 a schematic structural view of the dual-rotor motor in Figure 4 a schematic view of the cooperation between the plugging part and the plugging slot; Figure 5 is Figure 3 a sectional view taken along line A-A of the dual-rotor motor in Figure 6 is Figure 3 a sectional view taken along line B-B of the dual-rotor motor in Figure 7 a schematic structural view of the stator wire frame in the first perspective; Figure 8 a schematic structural view of the stator wire frame in the second perspective; Figure 9 is the second schematic view of the cooperation between the plugging part and the plugging slot. Detailed Embodiments

[0018] The present invention will be further described below with reference to the drawings and specific embodiments.

[0019] Embodiment: A dual-rotor motor is a unique motor with two output shafts. It can independently transmit the energy of the two output shafts, so it has broad application prospects in many fields. In this embodiment, the dual-rotor motor is applied to a dryer and becomes an important part of the dryer.

[0020] As Figure 1-8 shown, such a dual-rotor motor structurally includes at least the following parts: a stator 1, an inner rotor 2, an outer rotor 3, and an axial end cover 4.

[0021] The stator 1 includes a stator core 11 and two stator windings, which are not shown schematically in the drawings. The stator core 11 has an outer circumferential surface and an inner circumferential surface, making it an overall annular structure. On the stator core 11, a plurality of outer stator slots 111 are provided at positions corresponding to the outer circumferential surface, while a plurality of inner stator slots 112 are provided at positions corresponding to the inner circumferential surface. These two stator windings are respectively wound around the outer stator slots 111 and the inner stator slots 112 with specific wire diameters and turns, forming the inner and outer stators in the general sense. After being energized, these two stator windings generate inner and outer magnetic fields. The outer stator slots 111 and the inner stator slots 112 are both separated and formed by a plurality of uniformly distributed tooth portions 114 on the yoke portion 113, and the extending directions of these tooth portions 114 are opposite, and the yoke portion 113 itself is an annular structure.

[0022] The inner rotor 2 is arranged inside the inner circumferential surface and is in transmission connection with the stator 1. Its central part is connected to the first output shaft 21, and this first output shaft 21 undertakes the important task of transmitting torque. The outer rotor 3 is located outside the outer circumferential surface and is also in transmission connection with the stator 1.

[0023] The axial end cover 4 not only serves as a rotational mounting carrier for the first output shaft 21 but also is responsible for fixing the stator 1. Specifically, a bearing recess 41 is designed on the axial end cover 4. The first output shaft 21 realizes flexible rotation on the axial end cover 4 by means of a first bearing 40 embedded in the bearing recess 41; the stator core 11 can be detachably connected to the axial end cover 4, which provides convenience for maintenance and replacement.

[0024] In this embodiment, a plurality of insertion slots 115 are provided through the axial end faces of the stator core 11. These insertion slots 115 are arranged in a circumferential manner around the central axis of the stator core 11 and are located between the outer stator slots 111 and the inner stator slots 112. At the same time, a plurality of insertion portions 42 corresponding to the plurality of insertion slots 115 are provided on the end face of the axial end cover 4 facing the stator core 11. Through the mutual cooperation of the insertion portions 42 and the insertion slots 115, a detachable connection is achieved between the axial end cover 4 and the stator core 11. This design ensures that when the stator is damaged, the stator can be conveniently removed for local maintenance, such as replacing the winding, thereby effectively reducing the maintenance cost of the motor.

[0025] Meanwhile, the insertion part 42 includes a plurality of insertion unit bodies 421, which are spaced apart around the central axis of the end cover 4. In this example, each insertion part 42 includes two insertion unit bodies 421, with a gap 420 left between them. These gaps 420 enable a magnetic blocking air gap 110 to be formed between the insertion part 42 and the corresponding insertion slot 115. These magnetic blocking air gaps are located between the outer magnetic field and the inner magnetic field, and the magnetic blocking air gap 110 uses air to suppress the mutual interference between the internal and external magnetic fields. By using the magnetic blocking air gap 110 to replace the magnetic suppression component in the prior art, the mutual interference between the internal and external magnetic fields can be effectively suppressed. Compared with the prior art, this design ensures the stable output of the motor while eliminating the installation of the magnetic suppression component and simplifying the assembly process of the motor.

[0026] Of course, in other embodiments, as Figure 9 shown, a magnetic blocking air gap 110 as described above can be formed between the radially outer wall of the insertion part 42 and the radially outer wall of the corresponding insertion slot 115, and the insertion part 42 is firmly stuck on the radially inner wall of the insertion slot 115. In another embodiment, a magnetic blocking air gap 110 can also be formed between the radially inner wall of the insertion part 42 and the radially inner wall of the corresponding insertion slot 115. In this case, the radially outer wall of the insertion part 42 is tightly engaged with the radially outer wall of the insertion slot 115. This embodiment is not shown in the drawings.

[0027] The magnetic permeability of the insertion part 42 is lower than that of the stator core 11, which enables the insertion part 42 to act as a magnetic blocking component, thereby effectively reducing the mutual interference between the internal and external magnetic fields on the stator and improving the output stability and efficiency of the dual-rotor motor. In another embodiment, the surface of the insertion part 42 is covered with a magnetic blocking layer whose magnetic permeability is lower than that of the stator core 11. The magnetic blocking layer can be made of one of the materials such as zirconium silicate, aluminum oxide, zirconium oxide, titanium oxide, chromium oxide, vanadium oxide, cobalt oxide, etc., and can also reduce the mutual influence between the internal and external magnetic fields, thereby enhancing the output stability and efficiency of the dual-rotor motor.

[0028] In the structural design of the dual-rotor, the stator 1 usually further includes two stator wire frames 12 located at the axial two ends of the stator core 11.

[0029] As Figure 7-8As shown, specifically, the stator wire frame 12 has a yoke fitting ring 123, which is designed to closely fit the yoke 113 of the stator core 11 and is firmly connected to the stator core 11 through a plurality of metal connectors 13. These metal connectors 13 are usually press-fit shafts and are circumferentially distributed around the central axis of the yoke fitting ring 123. The yoke fitting ring 123 is particularly provided with connection holes 1231 for the metal connectors 13 to pass through, and the stator core 11 is correspondingly provided with docking holes 119 that cooperate with these metal connectors 13. To ensure electrical insulation performance, a plurality of outer insulation parts 121 are arranged on the outer periphery of the yoke fitting ring 123 to isolate a plurality of relatively outer teeth 114 on the stator core 11, and a plurality of inner insulation parts 122 are provided on the inner periphery to isolate the relatively inner teeth 114. The yoke fitting ring 123 is also particularly designed with relief grooves 1230, which have the same size and shape as the insertion slots 115, aiming to provide space for the insertion part 42 so that it can smoothly pass through the relief grooves 1230 and then be accurately inserted and installed in the insertion slots 115.

[0030] On the axial end face of the yoke fitting ring 123 facing the stator core 11, a number of positioning posts 1232 are also provided, and on the axial end face of the stator core 11 facing the yoke fitting ring 123, positioning holes 118 corresponding to the positioning posts 1232 are provided. Before firmly connecting the yoke fitting ring 123 to the stator core 11 using the metal connectors 13, the docking holes 119 and the connection holes 1231 must be precisely aligned to ensure accurate axial alignment between the two. The design of the positioning posts 1232 and the positioning holes 118 helps to quickly position between the docking holes 119 and the connection holes 1231, thus simplifying the assembly process and improving the installation efficiency.

[0031] The stator wire frame 12 is also provided with an outer insulation ring 124 and an inner insulation ring 125, which are specifically arranged on the yoke fitting ring 123 to effectively prevent interference with the outer stator winding and the inner stator winding. The outer insulation ring 124 is located between the outer stator wire groove 111 and the metal connector 13, while the inner insulation ring 125 is located between the inner stator wire groove 112 and the metal connector 13. Such a design increases the creepage distance between the metal connector 13 and the outer stator winding, and also increases the creepage distance between the metal connector 13 and the inner stator winding. Therefore, on the premise of ensuring electrical safety, the distance between the outer stator wire groove and the inner stator wire groove can be designed closer, that is, the outer diameter of the stator core can be minimized, thereby reducing the overall size of the stator. Correspondingly, the size of the entire double-rotor motor also becomes more compact and the volume is smaller. In the existing technology, to prevent the outer stator winding and the inner stator winding from being broken down and ensure the service life of the motor, the distance between the outer stator winding and the inner stator winding often needs to be designed larger, which results in a larger diameter of the stator core and thus a relatively larger volume of the double-rotor motor.

[0032] The connecting hole 1231 is tangent to the inner wall of the outer insulating ring 124 and also tangent to the outer wall of the inner insulating ring 125, making the distance between the outer insulating ring 124 and the inner insulating ring 125 relatively close. At the same time, the outer insulating ring 124 is arranged at the outer circumference of the yoke fitting ring 123, while the inner insulating ring 125 is placed at the inner circumference of the yoke fitting ring 123. Such a structural design enables the outer circumference of the yoke fitting ring 123 to be as close as possible to its inner circumference when using the same metal connecting piece 13 in the prior art. For the yoke 11 of the stator core, this also means that its outer circumference can be designed to be as close as possible to the inner circumference. On the premise of keeping the inner circumference size of the yoke 11 unchanged, the outer diameter of the yoke 11 is reduced, thereby further miniaturizing the overall diameter of the stator core, making the size of the dual-rotor motor smaller and the structure more compact, achieving more efficient space utilization.

[0033] The outer insulating ring 124 and the stator wire frame 12 are integrally formed and connected, and the inner insulating ring 125 and the stator wire frame 12 are also integrally formed and connected. That is to say, the outer insulating ring 124 and the inner insulating ring 125, as components of the stator wire frame 12, together with the wire frame 12 form a whole and are directly installed on the stator core 11. Such a design eliminates the cumbersome steps of separately installing the outer insulating ring 124 and the stator wire frame 12, significantly improving the convenience of installation.

[0034] For the above-mentioned stator wire frame 12, as Figure 5 shown, an axial gap 4 - 12 is provided between it and the corresponding axial end cover 4. This design ingeniously combines with the relief groove 1230 and the magnetic blocking air gap 110 to jointly form a connected air flow channel, enabling external air to smoothly enter the motor interior, thereby effectively reducing the temperature during motor operation, greatly improving the heat dissipation performance of the motor, and ensuring the motor operates in an efficient and stable state.

[0035] As Figure 6 shown, the end of the metal connecting piece 13 protrudes axially beyond the outer insulating ring 124 and the inner insulating ring 125 to form a positioning end. During the process of assembling the axial end cover 4 onto the stator core 11, these positioning ends precisely limit the insertion depth of the axial end cover 4, thereby easily obtaining the required axial gap 4 - 12. This design not only improves the assembly accuracy but also makes the overall assembly process of the motor more convenient and efficient.

[0036] As Figure 1 、 2 、3, and 6 shown, the metal connecting piece 13 is provided with an axially through hole, and an auxiliary fixing piece 7 passing through the axially through hole is provided on the axial end cover 4. The auxiliary fixing piece 7 can be a bolt and forms a threaded connection with the axially through hole.

[0037] The above embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various variations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A dual-rotor motor, comprising a stator (1) and an axial end cover (4). The stator (1) includes a stator core (11). The stator core (11) includes a plurality of outer stator slots (111) and a plurality of inner stator slots (112). After the stator windings are provided in the outer stator slots (111) and the inner stator slots (112), an outer magnetic field and an inner magnetic field are respectively formed. It is characterized in that, a plurality of insertion slots (115) penetrating through the axial end faces of the stator core (11) and arranged in a circumferential manner around the central axis of the stator core (11) and located between the outer stator slots (111) and the inner stator slots (112) are provided. On the end face of the axial end cover (4) facing the stator core (11), a plurality of insertion portions (42) matching with the plurality of insertion slots (115) are provided. Moreover, a magnetic-blocking air gap (110) located between the outer magnetic field and the inner magnetic field is formed between the insertion portion (42) and the insertion slot (115).

2. A dual-rotor motor according to claim 1, characterized in that, The insertion portion (42) includes a plurality of insertion unit bodies (421) arranged at intervals around the central axis of the axial end cover (4). A magnetic-blocking air gap (110) is formed between two adjacent insertion unit bodies (421) and the insertion slot (115).

3. A dual-rotor motor according to claim 1, characterized in that, The magnetic-blocking air gap (110) is formed between the radially outer wall of the insertion portion (42) and the radially outer wall of the corresponding insertion slot (115), or the magnetic-blocking air gap (110) is formed between the radially inner wall of the insertion portion (42) and the radially inner wall of the corresponding insertion slot (115).

4. A dual-rotor motor according to claim 1, wherein, The magnetic permeability of the insertion portion (42) is less than that of the stator core (11), or a magnetic-blocking layer with a magnetic permeability less than that of the stator core (11) is provided on the surface of the insertion portion (42).

5. A double-rotor motor according to claim 1, characterized in that, The stator (1) further includes two stator wire frames (12) provided at both axial ends of the stator core (11); The stator wire frame (12) includes a yoke fitting ring (123), a plurality of outer insulation portions (121) provided on the outer periphery of the yoke fitting ring (123), and a plurality of inner insulation portions (122) provided on the inner periphery of the yoke fitting ring (123).

6. A double-rotor motor according to claim 5, characterized in that, A relief groove (1230) for accommodating the insertion portion (42) is provided on the yoke fitting ring (123); An axial gap (4 - 12) is provided between the stator wire frame (12) and the corresponding axial end cover (4). The axial gap (4 - 12), the relief groove (1230), and the magnetic-blocking air gap (110) together form a connected air flow channel.

7. A dual-rotor motor according to claim 6, characterized in that, The yoke fitting ring (123) is connected to the stator core (11) through a metal connecting member (13); An outer insulation ring (124) and an inner insulation ring (125) are further provided on the stator wire frame (12). The outer insulation ring (124) is located between the outer stator slot (111) and the metal connecting member (13), and the inner insulation ring (125) is located between the inner stator slot (112) and the metal connecting member (13).

8. A dual-rotor motor according to claim 7, characterized in that, The end of the metal connecting member (13) axially protrudes from the outer insulating ring (124) and the inner insulating ring (125) and forms a positioning end; the positioning end is used to limit the insertion depth of the axial end cover (4) to obtain the axial gap (4-12).

9. A dryer, characterized in that, A double-rotor motor according to any one of claims 1 to 8.

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