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] This utility model relates to a dual-rotor motor and a clothes dryer, belonging to the field of motor technology. Background Technology

[0002] Among the diverse categories of electric motors, the dual-rotor motor stands out for its unique structure. Its stator core is typically connected to an end cover on the axial side of the stator core by bolts or other fixing components. This design enables the stator to be disassembled, allowing for partial repairs such as replacing the windings when the stator is damaged.

[0003] Meanwhile, the dual-rotor motor has inner and outer stator slots on the stator core, and stator windings are set in the corresponding slots to form inner and outer magnetic fields. A magnetic suppression component can be set between the two magnetic fields to suppress the mutual interference between the inner and outer magnetic fields, thereby ensuring the output stability and efficiency of the dual-rotor motor. However, this also increases the complexity of motor assembly and affects the assembly efficiency of the motor to some extent. Utility Model Content

[0004] One of the purposes of this application is to provide a dual-rotor motor that has stable output, can be partially repaired, and is easy to assemble.

[0005] A dual-rotor motor includes a stator and an axial end cover. The stator includes a stator core, which includes multiple outer stator slots and multiple inner stator slots. After stator windings are wound around the outer and inner stator slots, they respectively form an external magnetic field and an internal magnetic field. The axial end face of the stator core is provided with multiple insertion slots arranged circumferentially around the central axis of the stator core and located between the outer and inner stator slots. The end face of the axial end cover facing the stator core is provided with multiple insertion portions that cooperate with the multiple insertion slots. Furthermore, a magnetically blocking air gap is formed between the insertion portions and the insertion slots, located between the external magnetic field and the internal magnetic field.

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

[0007] Preferably, the magnetic blocking air gap is formed between the radial outer wall of the plug portion and the radial outer wall of the corresponding plug groove, or the magnetic blocking air gap is formed between the radial inner wall of the plug portion and the radial inner wall of the corresponding plug groove.

[0008] Preferably, the magnetic permeability of the plug portion is less than that of the stator core, or the surface of the plug portion is provided with a magnetic resisting layer whose magnetic permeability is less than that of the stator core.

[0009] Preferably, the stator further includes two stator frames disposed at both ends of the stator core along the axial direction;

[0010] The stator frame includes a yoke fitting ring, multiple outer insulation portions disposed on the outer periphery of the yoke fitting ring, and multiple inner insulation portions disposed on the inner periphery of the yoke fitting ring.

[0011] Preferably, the yoke fitting ring is provided with a clearance groove to accommodate the insertion part; an axial gap is provided between the stator frame and the axial end cover on the corresponding side, and the axial gap, clearance groove and magnetic blocking air gap together form a connected air flow channel.

[0012] Preferably, the yoke fitting ring is connected to the stator core via a metal connector; the stator frame is also provided with an outer insulating ring and an inner insulating ring, the outer insulating ring being located between the outer stator slot and the metal connector, and the inner insulating ring being located between the inner stator slot and the metal connector.

[0013] Preferably, the end of the metal connector protrudes axially from the outer insulating ring and the inner insulating ring, and is formed as a positioning end; the positioning end is used to limit the insertion depth of the axial end cap to obtain the axial clearance.

[0014] A clothes dryer comprising a dual-rotor motor as described in any of the above technical solutions.

[0015] In summary, this utility model has the following beneficial effects:

[0016] 1. In this utility model, the axial end cover and the stator core are connected by a plug-in part and a plug-in slot. A magnetic blocking air gap is formed between the plug-in part and the corresponding plug-in slot, which is located between the external magnetic field and the internal magnetic field. The magnetic blocking air gap is used to replace the magnetic suppression component in the prior art to suppress the mutual interference between the two magnetic fields. Compared with the prior art, while ensuring the stable output of the motor, the installation of the magnetic suppression component is eliminated, simplifying the assembly of the motor. At the same time, the plug-in connection method can ensure that the motor stator can be removed for partial maintenance, thereby effectively reducing the maintenance cost of the motor.

[0017] 2: In the dual rotor motor of this utility model, an axial gap is provided between the stator frame and the axial end cover on the corresponding side. Furthermore, the axial gap, the clearance groove on the stator frame, and the magnetically blocking air gap formed by the insertion groove and the insertion part together constitute a connected air flow channel, which allows external air to smoothly enter the motor, 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.

[0018] 3: In the dual rotor motor of this utility model, the end of the metal connector used to install the stator frame protrudes axially from the outer and inner insulating rings of the stator 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, thereby easily obtaining the required axial clearance. This design not only improves the accuracy of assembly, but also makes the overall assembly process of the motor more convenient and efficient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a dual-rotor motor.

[0020] Figure 2 for Figure 1 Exploded view of a dual-rotor motor;

[0021] Figure 3 for Figure 1 A schematic diagram of the structure of a dual-rotor motor from another perspective;

[0022] Figure 4 This is a schematic diagram showing the fit between the connector and the slot.

[0023] Figure 5 for Figure 3 Cross-sectional view of a dual-rotor motor (AA section);

[0024] Figure 6 for Figure 3 Cross-sectional view of a dual-rotor motor (BB);

[0025] Figure 7 This is a structural schematic diagram of the stator frame from a first-view perspective.

[0026] Figure 8 This is a structural schematic diagram of the stator frame from a second perspective.

[0027] Figure 9 This is a schematic diagram of the second type of mating between the connector and the slot. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] Example:

[0030] A dual-rotor motor is a unique type of motor with two output shafts, capable of independently transmitting energy from both shafts, thus offering broad application prospects in various fields. In this embodiment, the dual-rotor motor is used in a clothes dryer, becoming an important component of the dryer.

[0031] like Figure 1-8As shown, this dual-rotor motor structurally includes at least the following parts: stator 1, inner rotor 2, outer rotor 3, and axial end cover 4.

[0032] The stator 1 comprises a stator core 11 and two stator windings (not shown in the attached drawings). The stator core 11 has an outer circumferential surface and an inner circumferential surface, making it an overall ring structure. Multiple outer stator slots 111 are provided on the stator core 11 at positions corresponding to the outer circumferential surface, while multiple inner stator slots 112 are provided at positions corresponding to the inner circumferential surface. These two stator windings are wound with specific wire diameters and turns onto the outer stator slots 111 and inner stator slots 112, respectively, forming two stators in the conventional sense. When energized, these two stator windings generate inner and outer magnetic fields. The outer stator slots 111 and inner stator slots 112 are separated by multiple evenly distributed teeth 114 on a yoke 113, and these teeth 114 extend in opposite directions. The yoke 113 itself is a ring structure.

[0033] The inner rotor 2 is disposed within the inner circumferential surface and is connected to the stator 1 for transmission. Its central part is connected to the output shaft 21, which is responsible for transmitting torque. The outer rotor 3 is located outside the outer circumferential surface and is also connected to the stator 1 for transmission.

[0034] The axial end cover 4 not only serves as the rotating mounting carrier for the output shaft 21, but also fixes the stator 1. Specifically, the axial end cover 4 is designed with a bearing chamber 41. The output shaft 21 can rotate flexibly on the axial end cover 4 by means of a bearing 40 embedded in the bearing chamber 41. The stator core 11 can be detachably connected to the axial end cover 4, which provides convenience for maintenance and replacement.

[0035] In this embodiment, a plurality of insertion slots 115 are provided through the axial end face of the stator core 11. These insertion slots 115 are arranged circumferentially around the central axis of the stator core 11 and are located between the outer stator slot 111 and the inner stator slot 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 between 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, it can be easily removed for partial repair, such as replacing the windings, thereby effectively reducing the maintenance cost of the motor.

[0036] Meanwhile, the insertion portion 42 includes multiple insertion unit bodies 421, which are spaced apart around the central axis of the end cover 4. In this example, each insertion portion 42 includes two insertion unit bodies 421, with a gap 420 between them. These gaps 420 allow a magnetic blocking air gap 110 to be formed between the insertion portion 42 and the corresponding insertion slot 115. This magnetic blocking air gap is located between the external magnetic field and the internal 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 antimagnetic 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 stable motor output while eliminating the need for the installation of the antimagnetic component, simplifying the motor assembly process.

[0037] Of course, in other implementations, such as Figure 9 As shown, the aforementioned magnetically blocking air gap 110 can be formed between the radial outer wall of the insertion portion 42 and the radial outer wall of the corresponding insertion groove 115, and the insertion portion 42 is firmly engaged with the radial inner wall of the insertion groove 115. In another embodiment, a magnetically blocking air gap 110 can also be formed between the radial inner wall of the insertion portion 42 and the radial inner wall of the corresponding insertion groove 115. In this case, the radial outer wall of the insertion portion 42 is tightly engaged with the radial outer wall of the insertion groove 115. This embodiment is not illustrated in the accompanying drawings.

[0038] The permeability of the plug-in portion 42 is lower than that of the stator core 11, which allows the plug-in portion 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 plug-in portion 42 is covered with a magnetic blocking layer with a permeability lower than that of the stator core 11. This magnetic blocking layer can be made of one of the following materials: zirconium silicide, alumina, zirconium oxide, titanium oxide, chromium oxide, vanadium oxide, cobalt oxide, etc., which can also reduce the mutual influence of the internal and external magnetic fields, thereby enhancing the output stability and efficiency of the dual-rotor motor.

[0039] In the dual-rotor structural design, the stator 1 usually also includes two stator frames 12 located at both ends of the stator core 11 along the axial direction.

[0040] like Figure 7-8As shown, specifically, the stator frame 12 has a yoke fitting ring 123, which is designed to tightly fit the yoke 113 of the stator core 11 and is securely connected to the stator core 11 by multiple metal connectors 13. These metal connectors 13 are typically press-fit shafts and are circumferentially distributed around the central axis of the yoke fitting ring 123. The yoke fitting ring 123 is specially provided with connecting holes 1231 for the metal connectors 13 to pass through, and the stator core 11 is also provided with corresponding mating holes 119 that mate with these metal connectors 13. To ensure electrical insulation performance, the outer periphery of the yoke fitting ring 123 is provided with multiple outer insulating portions 121 to isolate the relatively outer teeth 114 on the stator core 11, while the inner periphery is provided with multiple inner insulating portions 122 to isolate the relatively inner teeth 114. The yoke fitting ring 123 is also specially designed with relief grooves 1230. These relief grooves are exactly the same size and shape as the insertion grooves 115, and are designed to provide space for the insertion part 42 so that it can pass smoothly through the relief grooves 1230 and be accurately inserted and installed in the insertion grooves 115.

[0041] The yoke fitting ring 123 has several positioning posts 1232 on its axial end face facing the stator core 11, and the stator core 11 has positioning holes 118 corresponding to the positioning posts 1232 on its axial end face facing the yoke fitting ring 123. Before using the metal connector 13 to securely connect the yoke fitting ring 123 to the stator core 11, the mating hole 119 and the connecting hole 1231 must be precisely aligned to ensure accurate axial alignment. The design of the positioning posts 1232 and the positioning holes 118 helps to achieve rapid positioning between the mating hole 119 and the connecting hole 1231, thereby simplifying the assembly process and improving installation efficiency.

[0042] The stator frame 12 is also equipped with an outer insulating ring 124 and an inner insulating ring 125, which are specifically set on the yoke fitting ring 123 to effectively prevent interference with the outer and inner stator windings. The outer insulating ring 124 is located between the outer stator slot 111 and the metal connector 13, while the inner insulating ring 125 is located between the inner stator slot 112 and the metal connector 13. This 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, under the premise of ensuring electrical safety, the distance between the outer and inner stator slots can be designed to be closer, that is, the outer diameter of the stator core can be reduced, thereby reducing the overall size of the stator. Correspondingly, the size of the entire dual-rotor motor becomes more compact and smaller in volume. In existing technologies, in order to prevent breakdown of the outer stator winding and inner stator winding and to ensure the service life of the motor, it is often necessary to design a larger distance between the outer stator winding and the inner stator winding. This results in a larger diameter of the stator core, which in turn makes the dual-rotor motor relatively large in size.

[0043] The connecting hole 1231 is tangent to the inner wall of the outer insulating ring 124 and 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. Simultaneously, the outer insulating ring 124 is positioned on the outer circumference of the yoke fitting ring 123, while the inner insulating ring 125 is positioned on the inner circumference of the yoke fitting ring 123. This structural design allows the outer circumference of the yoke fitting ring 123 to be as close as possible to its inner circumference when using the same metal connector 13 as 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 its inner circumference. While maintaining the inner circumferential dimensions of the yoke 11 unchanged, the outer diameter of the yoke 11 can be reduced, thereby further miniaturizing the overall diameter of the stator core. The size of the dual-rotor motor is thus smaller, the structure more compact, and more efficient space utilization is achieved.

[0044] 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 are components of the stator wire frame 12, and together with the wire frame 12, they form a whole and are directly installed on the stator core 11. This design eliminates the cumbersome steps of installing the outer insulating ring 124 and the stator wire frame 12 separately, and significantly improves the convenience of installation.

[0045] The aforementioned stator frame 12, such as Figure 5 As shown, an axial gap 4-12 is provided between it and the axial end cover 4 on the corresponding side. This design is cleverly combined with the clearance groove 1230 and the magnetically blocked air gap 110 to form a connected air flow channel, which allows external air to smoothly enter the motor, 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.

[0046] like Figure 6 As shown, the end of the metal connector 13 protrudes axially beyond the outer insulating ring 124 and the inner insulating ring 125, forming a positioning end. During the assembly of 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 achieving the required axial clearance 4-12. This design not only improves assembly accuracy but also makes the overall motor assembly process more convenient and efficient.

[0047] like Figure 1 , 2 As shown in Figures 3 and 6, the metal connector 13 is provided with an axial through hole, and the axial end cap 4 is provided with an auxiliary fastener 7 that passes through the axial through hole. The auxiliary fastener 7 can be a bolt, which forms a threaded connection with the axial through hole.

[0048] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A dual-rotor motor, comprising a stator (1) and an axial end cover (4), the stator (1) comprising a stator core (11), the stator core (11) comprising a plurality of outer stator slots (111) and a plurality of inner stator slots (112), the outer stator slots (111) and the inner stator slots (112) respectively forming an external magnetic field and an internal magnetic field after stator windings are provided, characterized in that, The axial end face of the stator core (11) is provided with a plurality of insertion slots (115) arranged in a circle around the central axis of the stator core (11) and located between the outer stator slot (111) and the inner stator slot (112). The end face of the axial end cover (4) facing the stator core (11) is provided with a plurality of insertion parts (42) that cooperate with the plurality of insertion slots (115). Furthermore, a magnetic gap (110) is formed between the insertion parts (42) and the insertion slots (115) located between the outer magnetic field and the inner magnetic field.

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

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

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

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

6. A dual-rotor motor according to claim 5, characterized in that, The yoke fitting ring (123) is provided with a relief groove (1230) that accommodates the insertion part (42). An axial gap (4-12) is provided between the stator frame (12) and the axial end cover (4) on the corresponding side. The axial gap (4-12), the clearance 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) via a metal connector (13). The stator frame (12) is also provided with an outer insulating ring (124) and an inner insulating ring (125). The outer insulating ring (124) is located between the outer stator slot (111) and the metal connector (13), and the inner insulating ring (125) is located between the inner stator slot (112) and the metal connector (13).

8. A dual-rotor motor according to claim 7, characterized in that, The end of the metal connector (13) protrudes axially 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 cap (4) to obtain the axial gap (4-12).

9. A clothes dryer, characterized in that, It includes the dual-rotor motor described in any one of claims 1 to 8.

Images