Motor stator and coreless motor with same

Abstract

The utility model relates to a motor stator and a coreless motor with the same, and the motor stator comprises a coreless winding which is fixedly arranged at the inner peripheral side of a side shell of the coreless motor; and the first stator iron core is fixedly arranged on the inner peripheral side of the hollow cup winding. As the stator core is arranged on the inner side of the coreless winding, the magnetic conductive capability of the stator core is effectively improved, and the air gap between the stator and the rotor is reduced, so that the working efficiency of the coreless motor is improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a motor stator and a coreless cup motor having the motor stator. Background Art

[0002] In the related art, the coreless motor structure includes a housing, a stator core fixed to the inner wall of the housing, a coreless winding fixed to the inner wall of the stator core, and a rotor disposed in the hollow area of ​​the coreless winding and rotatably connected to the housing. Under this structure, the magnetic conductivity of the stator core is poor, and the air gap between the rotor and the coreless winding is large, resulting in low efficiency of the coreless motor. Utility Model Content

[0003] The present application provides a motor stator and a coreless cup motor having the motor stator, aiming to solve the problems of poor magnetic conductivity and low efficiency of the coreless cup motor in the prior art.

[0004] According to one aspect of the present application, an embodiment provides a motor stator, including:

[0005] A coreless cup winding, wherein the coreless cup winding is fixedly disposed on the inner circumference of a side shell of the coreless cup motor;

[0006] A first stator core is fixedly disposed on the inner circumference of the hollow cup winding.

[0007] In one embodiment, there is a radial gap between the first stator core and the hollow cup winding.

[0008] In one embodiment, the first stator core and the hollow cup winding are fixedly connected by adhesive.

[0009] In one embodiment, at least two supporting protrusions distributed along the axial direction are provided on the outer side wall of the first stator core, and the supporting protrusions are in contact with the hollow cup winding to form the radial gap between the hollow cup winding and the first stator core.

[0010] In one embodiment, the motor stator further includes a second stator core, the second stator core is fixedly disposed on the outer circumference side of the hollow cup winding, and the second stator core is fixedly disposed on the inner circumference side of the side shell of the motor.

[0011] According to one aspect of the present application, an embodiment provides a coreless motor, comprising a housing, a rotor and the motor stator described above;

[0012] The housing includes the side housing and end covers respectively fixedly arranged at both ends of the side housing in the axial direction; the side housing and the end covers are enclosed to form a containing chamber, and the motor stator is fixedly arranged in the containing chamber;

[0013] The rotor is inserted into a hollow area formed by the first stator core and is rotatably connected to the end cover.

[0014] In one embodiment, the casing includes a first limit member and a second limit member, the first limit member and the second limit member are respectively arranged at two ends of the casing along the axial direction of the casing, and the first limit member and the second limit member clamp and fix the first stator core.

[0015] In one embodiment, one of the first limiting member and the second limiting member is integrally formed with one of the end covers, and the other is integrally formed with the side shell.

[0016] In one embodiment, the axial length of the first stator core is greater than the axial length of the second stator core.

[0017] In one embodiment, the motor stator includes a second stator core, the second stator core is fixedly disposed on the outer peripheral side of the hollow cup winding, and the second stator core is integrally formed with the side shell.

[0018] According to the motor stator and the hollow cup motor having the motor stator of the above embodiment, since the stator core is arranged on the inner side of the hollow cup winding, the magnetic conductivity of the stator core is effectively improved and the air gap between the stator and the rotor is reduced, thereby improving the working efficiency of the hollow cup motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the hollow cup motor structure in the related art;

[0020] Figure 2 This is a cross-sectional view of the hollow cup motor structure in the embodiment of the present application;

[0021] Figure 3 This is a cross-sectional view of another hollow cup motor structure in an embodiment of the present application;

[0022] Figure 4 for Figure 3 Schematic diagram of the enlarged part A in the figure.

[0023] Description of reference numerals:

[0024] 1- housing; 11- side housing; 12- end cover; 2- stator core; 20- motor stator; 21- second stator core; 22- first stator core; 23- gap; 24- support protrusion; 3- hollow cup winding; 4- rotor; 5- air gap; 61- first limiter; 62- second limiter. DETAILED DESCRIPTION

[0025] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0026] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations, and the operation steps involved in each embodiment can also be replaced or adjusted in a sequence in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing a certain embodiment and do not mean that the composition and / or sequence are necessary.

[0027] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0028] In related art, please refer to Figure 1 The hollow cup motor structure includes a casing 1, a stator core 2 fixedly arranged on the inner circumference of the casing 1, a hollow cup winding 3 fixedly arranged on the inner circumference of the stator core 2, and a rotor 4 inserted in the hollow area of ​​the hollow cup winding 3; it can be seen that the magnetic conductivity of the stator core 2 is limited by the size of the stator core 2, and there is a large air gap 5 between the hollow cup winding 3 and the rotor 4. The large air gap 5 will cause the radial magnetic field and axial magnetic field of the hollow cup motor to be weak, thereby causing the output torque of the hollow cup motor to be small, that is, the output power of the hollow cup motor is small, and the working efficiency of the hollow cup motor is low.

[0029] In order to solve the above problems, a motor stator is provided in the embodiment of the present application. Figure 2The motor stator includes a hollow cup winding 3 and a first stator core 22; the hollow cup winding 3 is fixedly arranged on the inner circumference of the side shell of the hollow cup motor, and the first stator core 22 is fixedly arranged on the inner circumference of the hollow cup winding 3.

[0030] Among them, the manufacturing process of the hollow cup winding 3 in the embodiment of the present application is to first perform winding, then press the wound wire group into a flat wire plate, wrap the flat wire plate on the surface of the cylindrical tooling, heat the coil to form it, and then remove the coil from the cylindrical tooling to form the required hollow cup winding 3. The manufactured hollow cup winding 3 is embedded in the outer peripheral side of the first stator core 22 according to its ring shape, and is fixedly connected to the first stator core 22.

[0031] The first stator core 22 is arranged on the inner circumference of the hollow cup winding 3, thereby enhancing the magnetic conductivity of the motor stator; and the first stator core 22 reduces the air gap between the original hollow cup winding 3 and the rotor 4, thereby enhancing the radial magnetic field and axial magnetic field of the hollow cup motor, so that the torque output by the hollow cup motor increases, thereby increasing the output power of the hollow cup motor and improving the working efficiency of the hollow cup motor. In addition, since the first stator core 22 is pre-separated from the hollow cup winding 3, it is possible to adapt to rotors 4 of different sizes by adjusting the size of the first stator core 22 or adjusting the distance between the first stator core 22 and the hollow cup winding 3, thereby expanding the application scenario.

[0032] During the processing, the hollow cup winding 4 can also be formed by winding the first stator core 22. During assembly, the first stator core 22 and the hollow cup winding 4 wound on the outer wall of the first stator core 22 are assembled into the hollow cup motor together, so that the hollow cup winding 4 does not need to be made by another cylindrical tooling die, thereby improving the processing efficiency.

[0033] In order to prevent the hollow cup winding 3 from expanding and squeezing the first stator core 22 during operation to cause deformation, thereby affecting the performance of the hollow cup motor, in some optional embodiments, a radial gap 23 may exist between the first stator core 22 and the hollow cup winding 3. The radial gap 23 may be naturally formed based on the thickness of the adhesive when the first stator core 22 and the hollow cup winding 3 are bonded together. In other words, the first stator core 22 and the hollow cup winding 3 may be fixedly connected by adhesive.

[0034] In addition, in some optional embodiments, please refer to Figure 3 and Figure 4In order to more effectively form a radial gap 23 between the hollow cup winding 3 and the outer surface of the first stator core 22, at least two support protrusions 24 distributed along the axial direction may be provided on the outer side wall of the first stator core 22, and the support protrusions 24 are in contact with the hollow cup winding 3, so that a radial gap 23 is formed between the hollow cup winding 3 and the first stator core 22. The existence of the support protrusions 24 forms a step-like structure on the surface of the first stator core 22. During assembly, the support protrusions 24 will contact the hollow cup winding 3, thereby preventing the outer surface of the first stator core 22 itself from directly contacting the hollow cup winding 3.

[0035] In addition, in the embodiment of the present application, the motor stator 20 further includes a second stator core 21, which is fixedly disposed on the outer peripheral side of the hollow cup winding 3, and the second stator core 21 is fixedly disposed on the inner peripheral side of the motor side shell 11. By providing the second stator core 21, the magnetic conductivity of the motor stator 20 can be further enhanced.

[0036] According to the motor stator of the above embodiment, since the stator core is arranged inside the hollow cup winding 3, the magnetic conductivity of the stator core is effectively improved, and the air gap between the stator and the rotor is reduced, thereby improving the working efficiency of the hollow cup motor.

[0037] The present application also provides a coreless motor. Please continue to refer to Figure 2 The coreless cup motor includes a housing 1, a rotor 4 and a motor stator 20 in the embodiment of the present application.

[0038] The housing 1 includes a circumferentially enclosed side housing 11 and end covers 12 respectively fixedly arranged at both ends of the axial direction of the side housing 11. The side housing 11 and the end covers 12 enclose a receiving chamber, and the motor stator 20 is fixedly arranged in the receiving chamber. The housing 1, as the outer contour of the hollow cup motor, can provide a relatively closed environment for the components inside the hollow cup motor, reducing the mutual influence between the external environment and the operation of the hollow cup motor. Considering durability and thermal conductivity, the housing 1 is generally made of metal.

[0039] The components of the casing 1 include a side shell 11 enclosed along the circumferential direction, which means that the side shell 11 as a whole is a hollow cylinder, and the hollow area is used to place other components of the hollow cup motor, such as the stator core, hollow cup winding and rotor, etc. The various components are embedded in the hollow area of ​​the casing 1 in a certain order.

[0040] The end cover 12 is arranged at the end of the side shell 11 in the axial direction, and is used to cover the hollow area formed by the side shell 11 from the end; wherein, the end cover 12 and the side shell 11 are finally fixedly connected. Before the end cover 12 and the side shell 11 are connected, the motor stator 20, the rotor 4 and other components are generally embedded in the hollow area of ​​the side shell 11; since the end covers 12 are arranged at both ends of the side shell 11, one side of the end cover 12 can be connected to the side shell 11 first, and then the various components are embedded in the hollow area, and then the other side end cover 12 is sealed.

[0041] In addition, the connection structure between the side shell 11 and the end cover 12, in addition to forming a fixed connection between the side shell 11 and the end cover 12 through various connection methods, can also be that at least one of the end covers 12 located at both ends of the side shell 11 is set to be integrally formed with the side shell 11, so that the connection strength between the side shell 11 and the corresponding end cover 12 can be improved, while improving the heat dissipation performance of the hollow cup motor.

[0042] The motor stator 20 is located in the accommodating chamber and is fixedly arranged on the inner circumference of the side shell 11. The inner circumference means that the second stator core 21 is arranged around the inner wall of the side shell 11. The connection between the motor stator 20 and the side shell 11 can be achieved by adhesive, that is, the motor stator 20 is bonded to the inner wall of the side shell 11 by adhesive. In addition, in some embodiments, when the motor stator 20 includes a second stator core 21, the second stator core 21 is fixedly arranged on the outer circumference of the hollow cup winding, and the second stator core 21 can be directly integrally formed with the side shell 11, which can not only ensure the connection strength between the second stator core 21 and the side shell 11, but also improve the heat dissipation performance of the hollow cup motor.

[0043] In addition, the hollow cup winding 4 can also be formed by winding the first stator core 22 during the processing. During assembly, the first stator core 22 and the hollow cup winding 4 wound on the outer wall of the first stator core 22 are assembled into the hollow cup motor together, so that the hollow cup winding 4 does not need to be made by another cylindrical tooling mold, thereby improving the processing efficiency.

[0044] The rotor 4 is inserted into the hollow area formed by the first stator core 22 and is rotatably connected to the end cover 12. The rotatable connection between the rotor 4 and the end cover 12 can be achieved by connecting the rotor 4 to the end cover 12 through a bearing and realizing rotation through the bearing.

[0045] Among them, in the embodiment of the present application, the first stator core 22 is fixed to the inner circumference of the hollow cup winding 3, including the first stator core 22 is directly fixedly connected to the hollow cup winding 3, or the first stator core 22 is indirectly fixedly connected to the hollow cup winding 3. In some optional embodiments, the first stator core 22 and the hollow cup winding 3 can be directly fixedly connected by adhesive, that is, the first stator core 22 is directly fixedly connected to the hollow cup winding 3.

[0046] In some alternative embodiments, please refer to Figure 3 In order to realize the indirect fixed connection between the first stator core 22 and the hollow cup winding 3, the housing 1 may include a first stopper 61 and a second stopper 62, which are respectively arranged at two ends of the housing 1 along the axial direction of the housing 1, and the first stopper 61 and the second stopper 62 clamp and fix the first stator core 22. In other words, the first stator core 22 can be fixedly connected with the housing 1 by clamping the first stopper 61 and the second stopper 62 arranged on the housing 1, and since the housing 1 and the second stator core 21, and the second stator core 21 and the hollow cup winding 3 are also fixedly connected in sequence, it is equivalent to indirectly realizing the fixed connection between the hollow cup winding 3 and the first stator core 22.

[0047] In order to fix the first limiter 61 and the second limiter 62, in some optional embodiments, at least one of the first limiter 61 and the second limiter 62 is integrally formed with one of the end covers 12. Since the first limiter 61 and the second limiter 62 are arranged at both ends of the casing 1 along the axial direction of the casing 1, the first limiter 61 and the second limiter 62 are respectively arranged adjacent to the two end covers 12; then, under this structure, the first limiter 61 / the second limiter 62 can be directly formed on the end cover 12 at the corresponding position, which can improve the connection strength between the first limiter 61 / the second limiter 62 and the casing 1, and simplify the process flow and reduce the production cost of the product. During the assembly process, the second stator core 21, the hollow cup winding 3, the first stator core 22 and the rotor 4 can be assembled, and then the end cover 12 can be installed, so as to complete the fixing of the first stator core 22 and the sealing of the hollow cup motor at one time.

[0048] In some embodiments, one of the first stopper 61 and the second stopper 62 is integrally formed with one of the end covers 12, and the other can be integrally formed with the side shell 11. When the stopper is formed on the side shell 11, after the first stator core 22 is installed, the first stator core 22 can be directly pre-positioned according to the stopper, which is equivalent to pre-installing the first stator core 22.

[0049] In some optional embodiments, in order to facilitate the installation of the first stator core 22, the axial length of the first stator core 22 can be set to be greater than the axial length of the second stator core 21. In this way, during the assembly process, one end of the first stator core 22 can be flush with the second stator core 21 through the first stopper 61 / the second stopper 62, and the other end protrudes outward compared to the second stator core 21, so that the second stopper 62 / the first stopper 61 at the other end can accurately clamp the first stator core 22, thereby avoiding the situation where the first stator core 22 is loosened due to the failure to properly clamp the first stator core 22.

[0050] According to the coreless motor provided in the embodiment of the present application, since a double stator core structure including a second stator core 21 and a first stator core 22 is formed on the inner circumference of the casing 1, the magnetic conductivity of the stator core is effectively improved and the air gap is reduced, thereby improving the working efficiency of the coreless motor.

[0051] The above specific examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. For those skilled in the art of the present invention, some simple deductions, deformations or substitutions can be made based on the idea of ​​the present invention.

Claims

1. A motor stator, characterized in that: include: A coreless cup winding, wherein the coreless cup winding is fixedly disposed on the inner circumference of a side shell of the coreless cup motor; A first stator core is fixedly disposed on the inner circumference of the hollow cup winding.

2. The motor stator according to claim 1, characterized in that: There is a radial gap between the first stator core and the hollow cup winding.

3. The motor stator according to claim 2, characterized in that: The first stator core and the hollow cup winding are fixedly connected by adhesive.

4. The motor stator according to claim 2, characterized in that: At least two supporting protrusions distributed along the axial direction are arranged on the outer side wall of the first stator core, and the supporting protrusions are in contact with the hollow cup winding, so that the radial gap is formed between the hollow cup winding and the first stator core.

5. The motor stator according to any one of claims 1 to 4, characterized in that: The motor stator further includes a second stator core, which is fixedly disposed on the outer peripheral side of the hollow cup winding and fixedly disposed on the inner peripheral side of the side shell of the motor.

6. A coreless motor, characterized in that: It comprises a housing, a rotor and a motor stator as claimed in any one of claims 1 to 5; The housing includes the side housing and end covers respectively fixedly arranged at both ends of the side housing in the axial direction; the side housing and the end covers are enclosed to form a containing chamber, and the motor stator is fixedly arranged in the containing chamber; The rotor is inserted into a hollow area formed by the first stator core and is rotatably connected to the end cover.

7. The coreless motor according to claim 6, characterized in that: The casing includes a first limiting member and a second limiting member, the first limiting member and the second limiting member are respectively arranged at two ends of the casing along the axial direction of the casing, and the first limiting member and the second limiting member clamp and fix the first stator core.

8. The coreless motor according to claim 7, characterized in that: One of the first limiting member and the second limiting member is integrally formed with one of the end covers, and the other is integrally formed with the side shell.

9. The coreless motor according to any one of claims 6 to 8, characterized in that: The axial length of the first stator core is greater than the axial length of the second stator core.

10. The coreless motor according to any one of claims 6 to 8, characterized in that: The motor stator includes a second stator core, which is fixedly arranged on the outer peripheral side of the hollow cup winding, and the second stator core is integrally formed with the side shell.

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