Stator core, double-rotor motor and clothes dryer

Abstract

A stator core, a birotor motor and a clothes dryer, the stator core comprises a plurality of outer stator wire slots and a plurality of inner stator wire slots, the outer stator wire slots and the inner stator wire slots are formed by separating a plurality of tooth parts uniformly distributed on yoke parts, and the extension directions of the tooth parts on the two yoke parts are opposite. The plurality of inner stator wire slots are used for accommodating stator windings to form an inner magnetic field, the plurality of outer stator wire slots are used for accommodating stator windings to form an outer magnetic field, and at least one yoke part is provided with a magnetic resistance structure used for inhibiting mutual interference between the inner magnetic field and the outer magnetic field. According to the utility model, on the premise of ensuring the output stability and efficiency of the double-rotor motor, the distance between the outer stator wire duct and the inner stator wire duct can be reduced, so that the outer diameter of the stator core is reduced, the size of the stator is reduced, and the size of the double-rotor motor is smaller; therefore, the double-rotor motor is suitable for a clothes dryer and other scenes with high volume requirements, and the equipment compactness is improved.

Description

Technical Field

[0001] This utility model relates to a stator core, a dual-rotor motor, and a clothes dryer, belonging to the field of motor technology. Background Technology

[0002] One type of motor is the dual-rotor motor, which has inner and outer stator slots on the stator core and stator windings in the corresponding stator slots to form inner and outer magnetic fields. For example, a dual-shaft independently adjustable motor is disclosed in Chinese Patent Application No. 202410451367.9.

[0003] Currently, a large distance is required between the outer stator slot and the inner stator slot to suppress the mutual interference between the two magnetic fields, thereby ensuring the output stability and efficiency of the dual rotor motor. However, this also results in a large outer diameter of the stator core and a large motor size, which is not conducive to application in scenarios with high size requirements, such as clothes dryers, and is not conducive to improving the compactness of the equipment. Utility Model Content

[0004] One of the purposes of this application is to provide a stator core that can reduce the outer diameter while ensuring the output stability and efficiency of a dual-rotor motor.

[0005] A stator core for a dual-rotor motor includes multiple outer stator slots and multiple inner stator slots. Both the outer and inner stator slots are separated by multiple teeth evenly distributed on a yoke, and the teeth on the two yokes extend in opposite directions. The multiple inner stator slots are used to accommodate stator windings to form an internal magnetic field, and the multiple outer stator slots are used to accommodate stator windings to form an external magnetic field. At least one yoke is provided with a magnetic blocking structure to suppress mutual interference between the internal and external magnetic fields.

[0006] Preferably, the magnetically resistive structure includes a plurality of air slots arranged circumferentially around the central axis of the yoke.

[0007] Preferably, the air groove sweeps across at least one outer stator groove or one inner stator groove along the circumferential direction of the yoke.

[0008] Preferably, the two yokes are integrally formed, connected by an interference fit, or connected by a connector.

[0009] Preferably, the magnetic blocking structure comprises a plurality of magnetic blocking sheets arranged circumferentially around the central axis of the yoke.

[0010] Preferably, the magnetic blocking sheet is embedded in the corresponding yoke.

[0011] Preferably, the magnetic blocking structure includes a magnetic blocking ring, which is coaxially arranged with the yoke and disposed between the two yokes, and is connected to the two yokes to form a whole.

[0012] A dual-rotor motor includes a stator core, wherein the stator core is the stator core described in any of the above-mentioned technical solutions.

[0013] A clothes dryer comprising the dual-rotor motor described above.

[0014] In summary, this utility model has the following beneficial effects:

[0015] 1. Compared with the prior art, this utility model, by setting a magnetic blocking structure on the yoke of the stator core to effectively suppress the mutual interference between the internal and external magnetic fields, ensures the output stability and efficiency of the dual rotor motor. At the same time, it can reduce the distance between the outer stator slot and the inner stator slot, thereby reducing the outer diameter of the stator core and reducing the stator size. This makes the dual rotor motor smaller and more suitable for applications with high size requirements, such as clothes dryers, thus improving the compactness of the equipment.

[0016] 2: In this utility model, the magnetic resisting structure specifically adopts an air groove. The magnetic resisting structure can improve the airflow inside the motor and reduce the temperature of the motor during operation.

[0017] 3: In this utility model, the two yokes of the stator core are integrally formed and connected, that is, the stator laminations that make up the stator core are formed with teeth and grooves on both sides by a single stamping, which is convenient to manufacture and saves manufacturing costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a dual-rotor motor.

[0019] Figure 2 for Figure 1 Schematic diagram of the middle stator core;

[0020] Figure 3 This is a schematic diagram of the structure of the second type of stator core;

[0021] Figure 4 This is a schematic diagram of the structure of the third type of stator core;

[0022] Figure 5 To form Figure 4 A schematic diagram of the structure of one part of the stator core;

[0023] Figure 6 To form Figure 4 A schematic diagram of another part of the stator core in the circuit;

[0024] Figure 7 This is a schematic diagram of the fourth type of stator core;

[0025] Figure 8This is a schematic diagram of the fifth type of stator core. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Example:

[0028] A dual-rotor motor is a type of motor with two output shafts, enabling independent energy transfer between the two shafts. It has a wide range of applications and promising prospects in many fields. In this embodiment, the dual-rotor motor is applied to a clothes dryer, becoming part of the dryer.

[0029] A dual-rotor motor, in its structure, such as Figure 1 As shown, it includes:

[0030] Stator 1 includes stator core 11 and two stator windings. The stator windings are not shown in the attached drawings. The stator core 11 has an outer circumferential surface and an inner circumferential surface, making the stator 1 basically annular.

[0031] The inner rotor 2 is disposed within the inner circumferential surface and is connected to the stator 1 for transmission.

[0032] The outer rotor 3 is located outside the outer circumferential surface and is connected to the stator 1 for transmission.

[0033] Multiple outer stator slots 111 are provided on the stator core 11 at positions corresponding to the outer circumferential surface, and multiple inner stator slots 112 are provided on the stator core 11 at positions corresponding to the inner circumferential surface. The two stator windings are respectively arranged on the outer stator slots 111 and the inner stator slots 112 with appropriate wire diameters and number of turns, forming two stators in a general sense. The two stator windings are used to conduct electricity to form two magnetic fields, inner and outer.

[0034] Since the stator 1 forms two stators in the general sense on the inner and outer circumferential surfaces, the inner and outer stators also have the characteristics of inner and outer circumferential surfaces, that is, the diameter of the outer circumferential surface is larger than the diameter of the inner circumferential surface. Correspondingly, the diameter of the outer stator relying on the outer circumferential surface is larger than that of the inner stator relying on the inner circumferential surface. Therefore, the outer stator can adopt a majority slot design and the inner stator can adopt a minority slot design, that is, the number of outer stator slots 111 is greater than the number of inner stator slots 112.

[0035] The stator 1 achieves two independent stators, an outer stator and an inner stator, on its inner and outer circumferential surfaces in a general sense: the outer stator slot 111 and the inner stator slot 112 are both formed by a plurality of teeth 114 evenly distributed on the yoke 113 to separate them, and the teeth 114 on the two yokes 113 extend in opposite directions. The stator winding is wound on the teeth 114, and the yoke 113 is a ring structure.

[0036] Unlike existing technologies, at least one of the yokes 113 is provided with a magnetically resistive structure.

[0037] like Figure 1-2 As shown, the magnetic reluctance structure is an air slot 115, which axially penetrates the corresponding yoke 113. Multiple air slots 115 are arranged circumferentially around the central axis of the yoke 113. Each air slot 115 passes over at least one outer stator slot 111 or one inner stator slot 112 along the circumferential direction of the yoke 113. Utilizing the characteristic that the permeability of air is less than that of the stator core 11, the air slot 115 increases the magnetic reluctance between the inner and outer magnetic fields, effectively suppressing mutual interference between them. Therefore, while ensuring the output stability and efficiency of the dual-rotor motor, the distance between the outer stator slot 111 and the inner stator slot 112 can be reduced, thereby reducing the outer diameter of the stator core and thus the stator size. This makes the dual-rotor motor more suitable for applications with high size requirements, such as clothes dryers, improving equipment compactness. Furthermore, the air slot 115 can also improve airflow inside the motor, reducing the operating temperature.

[0038] exist Figure 2 In this process, the two yokes 113 are integrally formed, meaning that the stator laminations that make up the stator core are stamped in one go to form teeth and grooves on both sides, which is convenient to manufacture and saves manufacturing costs.

[0039] exist Figure 2 In the middle, both yokes 113 are provided with a plurality of air slots 115. The number of air slots 115 on the two yokes 113 is equal. The air slots 115 on the outer yoke 113 are connected to the corresponding air slots 115 on the inner yoke 113, forming a larger air slot.

[0040] Figure 3 Another stator core 11 with air slots 115 is provided. On this stator core 11, the two yokes 113 are independent of each other and are press-fitted together by interference fit. Both yokes 113 are provided with multiple air slots 115. The number of air slots 115 on the two yokes 113 is equal. The air slots 115 on the outer yoke 113 communicate with the corresponding air slots 115 on the inner yoke 113, forming a larger air slot.

[0041] Figure 4-6Another stator core 11 with an air groove 115 is also provided. The two yokes 113 are respectively provided with a connecting step 1131 and a connecting step 1132. The connecting step 1131 is provided on the inner wall of the outer yoke 113, and the connecting step 1132 is provided on the outer wall of the other yoke 113. The sum of the axial thickness of the connecting step 1131 and the axial thickness of the connecting step 1132 is equal to the axial thickness of the stator core 11. The connecting step 1131 and the connecting step 1132 are detachably connected together, so that the inner and outer stators are detachably connected together. If one of the inner and outer stators is damaged, it can be partially replaced and repaired, reducing the repair cost. The connecting step 1131 and the connecting step 1132 can be connected together by connectors such as bolts or rivets.

[0042] like Figure 7 As shown, the magnetic resisting structure can use magnetic resisting sheets 116. There are multiple magnetic resisting sheets 116, which are arranged circumferentially around the central axis of the yoke 113. The magnetic resisting sheets 116 are embedded in the yoke 113. The magnetic resisting sheets 116 are arc-shaped sheets. The magnetic resisting sheets 116 can be made of materials that are resistant to high temperatures and have a magnetic permeability lower than that of the stator core 11, such as zirconium silicide, alumina, zirconium oxide, titanium oxide, chromium oxide, vanadium oxide, cobalt oxide, etc. The list will not be exhaustive here. The magnetic resisting sheets 116 increase the magnetic resistance between the internal and external magnetic fields, effectively suppressing the mutual interference between the internal and external magnetic fields. Therefore, under the premise of ensuring the output stability and efficiency of the dual rotor motor, the distance between the outer stator slot 111 and the inner stator slot 112 can be reduced, thereby reducing the outer diameter of the stator core and reducing the stator size. This makes the dual rotor motor smaller and more suitable for applications with high size requirements, such as clothes dryers, thus improving the compactness of the equipment.

[0043] like Figure 8As shown, only one yoke 113 is provided with a magnetic blocking structure, and the magnetic blocking structure is a magnetic blocking ring 117. The magnetic blocking ring 117 is coaxially arranged with the two yokes 113. At the same time, the magnetic blocking ring 117 is disposed between the two yokes 113 and is connected to the two yokes 113 as a whole by means including but not limited to interference fit. The magnetic blocking ring 117 can be made of a material that is resistant to high temperature and has a magnetic permeability lower than that of the stator core 11, just like the magnetic blocking sheet 116 mentioned above. For example, zirconium silicide, alumina, zirconium oxide, titanium oxide, chromium oxide, vanadium oxide, and cobalt oxide. The magnetic blocking ring 117 increases the magnetic resistance between the internal and external magnetic fields. In addition, the magnetic blocking ring 117 has a magnetic blocking effect in the circumferential direction of 360°, effectively suppressing the mutual interference between the internal and external magnetic fields. Of course, in other embodiments, each of the two yoke portions 113 may be provided with a magnetic blocking ring 117, one of the magnetic blocking rings 117 being coaxially disposed on the inner wall of the outer yoke portion 113 of the two yoke portions 113, and the other magnetic blocking ring 117 being coaxially disposed on the outer wall of the other yoke portion 113. The two magnetic blocking rings 117 are connected by, but not limited to, an interference fit, thereby connecting the two yoke portions 113 into a whole.

[0044] 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 stator core for a dual-rotor motor, comprising a plurality of outer stator slots (111) and a plurality of inner stator slots (112), wherein both the outer stator slots (111) and the inner stator slots (112) are separated by a plurality of teeth (114) evenly distributed on a yoke (113), and the teeth (114) on the two yokes (113) extend in opposite directions; the plurality of inner stator slots (112) are used to accommodate stator windings to form an internal magnetic field, and the plurality of outer stator slots (111) are used to accommodate stator windings to form an external magnetic field, characterized in that, At least one yoke (113) is provided with a magnetic blocking structure to suppress mutual interference between the internal and external magnetic fields.

2. A stator core according to claim 1, characterized in that, The magnetically resistive structure includes a plurality of air slots (115) arranged circumferentially around the central axis of the yoke (113).

3. A stator core according to claim 2, characterized in that, The air slot (115) passes over at least one outer stator slot (111) or one inner stator slot (112) along the circumferential direction of the yoke (113).

4. A stator core according to claim 2, characterized in that, The two yokes (113) are integrally formed, or connected by an interference fit, or connected by a connector.

5. A stator core according to claim 1, characterized in that, The magnetic blocking structure includes a plurality of magnetic blocking sheets (116) arranged circumferentially around the central axis of the yoke (113).

6. A stator core according to claim 5, characterized in that, The magnetic blocking sheet (116) is embedded in the corresponding yoke (113).

7. A stator core according to claim 1, characterized in that, The magnetic blocking structure includes a magnetic blocking ring (117), which is coaxially arranged with the yoke (113) and is disposed between the two yokes (113) and connected to the two yokes (113) to form a whole.

8. A dual-rotor motor, comprising a stator core, characterized in that, The stator core is the stator core described in any one of claims 1 to 7.

9. A clothes dryer, characterized in that, It includes the dual-rotor motor as described in claim 8.

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