Stator for external rotor motor

Abstract

The utility model relates to the field of motors, adapts to a three-side magnetic steel rotor motor, and particularly relates to a stator for an external rotor motor, which comprises a stator bracket, an iron core and a coil, a plurality of coil slots I are arranged at the outer side of the stator bracket, the iron core is fixed at the outer side of the stator bracket, and the iron core comprises a plurality of iron core magnetic poles I and a plurality of iron core magnetic poles II which are alternately arranged; the side portions of the first iron core magnetic poles are provided with second coil grooves respectively, the inner end faces of every two adjacent first iron core magnetic poles make surface contact, positioning grooves are formed in the outer ends of every two adjacent first iron core magnetic poles and are in a flaring shape in the radial direction of the iron core, one ends of the second iron core magnetic poles are embedded into the positioning grooves, and the other ends of the second iron core magnetic poles are located on the outer sides of the positioning grooves. A third coil groove is formed between the ends, located on the outer sides of the positioning grooves, of every two adjacent second iron core magnetic poles, and the first coil groove, the second coil groove and the two third coil grooves form a winding groove. The structure density is compact, the magnetic field around the coil is fully utilized, the magnetic field interacts with the magnetic steel to the maximum extent, and the power density is maximized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, and more particularly, to a stator for an outer rotor electric machine. BACKGROUND

[0002] It is known that permanent magnet electric machines use conductors to generate a magnetic field through electric current, which then interacts with permanent magnets to form a force moment to drive the rotor to rotate. The wider the contact area between the conductors, i.e. the coils of the electric machine, and the permanent magnets, i.e. the greater the power density, the greater the interaction force between the magnetic field and the permanent magnets. Therefore, how to increase the contact area is an important topic for all researchers in the electric machine industry.

[0003] The most commonly used electric machine is a radial flux electric machine, whether it is an inner rotor or an outer rotor electric machine. The radial flux electric machine uses a circle of magnetic field in the diameter direction to interact and generate a rotating torque. In essence, it uses one face of the magnetic field. The design structure of this type of electric machine is relatively simple and has a low cost. Another type of electric machine is an axial flux electric machine, which uses a group of coils to form double-sided magnetic poles, which are matched with permanent magnets on both sides to form a double-sided magnetic field electric machine. Compared with the radial flux electric machine, the axial flux electric machine has a higher power density. However, due to the complex design of the stator structure, its application scenarios are limited.

[0004] How to optimize the structure of the stator and effectively integrate the radial flux electric machine and the axial flux electric machine is an important research direction for increasing the power of the electric machine. Based on the above reasons, the applicant provides a high-power-density modular stator by referring to the mortise-and-tenon structure. SUMMARY

[0005] To solve the above technical problems, the present application provides a stator for an outer rotor electric machine, which has a compact structure density, fully utilizes the magnetic field around the coil, maximizes the interaction with the magnetic steel, and maximizes the power density.

[0006] To achieve the above purpose, the present application adopts the following technical solutions:

[0007] The stator for an outer rotor electric machine comprises a stator support, an iron core, and a coil,

[0008] The outer side of the stator support is provided with a plurality of coil grooves one;

[0009] The iron core is fixed to the outside of the stator support. The iron core includes several iron core poles one and several iron core poles two arranged alternately. The iron core poles one form the inner ring part of the iron core, and the iron core poles two form the inner ring part of the iron core. The side of the iron core poles one is respectively provided with coil slots two. The inner end faces of two adjacent iron core poles one are in contact with each other, and the outer ends of two adjacent iron core poles one form a positioning groove. The positioning groove is flared in the radial direction of the iron core. One end of the iron core pole two is embedded in the positioning groove, and the other end is located outside the positioning groove. The ends of two adjacent iron core poles two located outside the positioning groove form a coil slot three. Coil slots one, two, and two coil slots three form a winding groove, and the coil is located in the winding groove.

[0010] Furthermore, the stator support includes a first stator support and a second stator support that are fixedly connected. The outer end faces of the first stator support and the second stator support are provided with several wire grooves. When the first stator support and the second stator support are fixedly connected, the wire grooves of the first stator support and the wire grooves of the second stator support are connected to form a coil groove.

[0011] Furthermore, limit rings are respectively provided on the mutually distant end faces of the stator support one and stator support two, and the inner side of the iron core is located between the two limit rings.

[0012] Furthermore, the axial width of the end of the second iron core magnetic pole located outside the positioning groove is less than the axial width of the end of the second iron core magnetic pole located inside the positioning groove, and the axial width of the end of the second iron core magnetic pole located inside the positioning groove is the same as the axial width of the first iron core magnetic pole.

[0013] Furthermore, it also includes several screws, the stator support is provided with screw holes extending in the radial direction, the iron core is provided with through holes extending in the radial direction, and the screws are threadedly connected to the screw holes after passing through the through holes.

[0014] Furthermore, the second iron core magnetic pole is provided with a hole one in the radial direction, and the first iron core magnetic pole is provided with a hole two corresponding to the first through hole. The first screw passes through the first hole and the second hole in sequence and is threadedly connected to the first screw hole. When the iron core is fixed on the stator support by several screws one, several second iron core magnetic poles squeeze several first iron core magnetic poles from the outside.

[0015] Furthermore, the second iron core magnetic pole is provided with a hole one in the radial direction, and the first iron core magnetic pole is provided on both sides of the second iron core magnetic pole with an arc groove corresponding to the hole one. Two adjacent arc grooves form a hole two. The screw one passes through the hole one and the hole two in sequence and is threaded to the screw hole one. When the iron core is fixed on the stator support by several screws one, several second iron core magnetic poles squeeze several first iron core magnetic poles from the outside.

[0016] Furthermore, the outer end of the screw is embedded in the hole of the second iron core pole.

[0017] Furthermore, both the first and second iron core magnetic poles are made of stacked silicon steel sheets.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. The stator for the external rotor motor disclosed in this utility model has a coil wound in a ring. One set of coils can generate a three-sided magnetic field. When combined with a rotor with two sets of axial permanent magnets and one set of radial permanent magnets, it is suitable for three-sided magnetic steel rotor motors, such as those used in flight facilities, high-precision instruments, or military facilities.

[0020] 2. The stator for the external rotor motor disclosed in this utility model adopts a modular design. The first and second iron core magnetic poles adopt a mortise and tenon structure design. The structure design is reasonable. The horizontal and vertical arrangement can guide the axial magnetic field and generate the radial magnetic field.

[0021] 3. The stator for an external rotor motor disclosed in this utility model has a stator bracket that is snapped together in two halves and fixed with screws to facilitate axial compression of the iron core. A screw hole is provided in the stator bracket to facilitate radial tensioning of the iron core.

[0022] 4. The stator for the external rotor motor disclosed in this utility model adopts an embedded design at the outer end of the screw to avoid radial magnetic field interference.

[0023] In summary, this application features a compact structure that fully utilizes the magnetic field around the coil to maximize its interaction with the magnet, thereby maximizing its power density. Attached Figure Description

[0024] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0025] Figure 1 This is a perspective view of the stator used in the external rotor motor in the embodiment;

[0026] Figure 2 This is a schematic diagram of the iron core structure in the embodiment;

[0027] Figure 3 This is a side view of the stator for the external rotor motor in the embodiment;

[0028] Figure 4 This is a three-dimensional view of the second iron core magnetic pole in the embodiment;

[0029] Figure 5This is a schematic diagram of the structure in which one iron core magnetic pole one and one iron core magnetic pole two cooperate with each other in the embodiment;

[0030] Figure 6 This is a cross-sectional view of the interaction between two iron core magnetic poles (first) and one iron core magnetic pole (second) in the embodiment.

[0031] Figure 7 This is a perspective view of the stator support in the embodiment;

[0032] Figure 8 This is a schematic diagram of the structure of the stator of the external rotor motor in the embodiment, which is equipped with two sets of axial permanent magnets and one set of radial permanent magnets.

[0033] Figure 9 for Figure 8 Exploded view.

[0034] The numbers in the diagram are: 11-Coil slot one, 12-Stator support one, 13-Stator support two, 14-Screw hole two, 15-Limiting ring, 16-Screw hole one, 21-Iron core pole one, 22-Iron core pole two, 23-Coil slot two, 24-Coil slot three, 25-Hole one, 26-Circular arc slot, 31-Axial permanent magnet, 32-Radial permanent magnet. Detailed Implementation

[0035] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0036] Please refer to Figures 1-9 This utility model discloses a stator for an external rotor motor, comprising a stator support, an iron core, a coil, and several screws.

[0037] The stator support has several coil slots 11 on its outer side. Specifically, the stator support includes a first stator support 12 and a second stator support 13. Both the first stator support 12 and the second stator support 13 have corresponding screw holes 14 extending axially. The first stator support 12 and the second stator support 13 are fixedly connected by screws. Several wire slots are provided on the outer end faces of both the first stator support 12 and the second stator support 13. After the first stator support 12 and the second stator support 13 are fixedly connected, the wire slots of the first stator support 12 and the second stator support 13 communicate to form coil slots 11. Limiting rings 15 are provided on the mutually distant end faces of the first stator support 12 and the second stator support 13, and the inner side of the iron core is located between two limiting rings 15. The second stator support 12 has screw holes 16 extending radially.

[0038] The iron core comprises several alternating iron core poles 21 and several iron core poles 22, both of which are made of stacked silicon steel sheets. Figure 6 As shown, the stacking direction of the first iron core pole 21 is arranged radially inward and outward, and the stacking direction of the second iron core pole 22 is arranged circumferentially. Other soft magnetic materials can also be used for the first and second iron core poles 21 and 22. Several first iron core poles 21 constitute the inner ring portion of the iron core, and several second iron core poles 22 constitute the inner ring portion of the iron core. Coil slots 23 are respectively provided on the sides of the first iron core poles 21. The inner end faces of two adjacent first iron core poles 21 are in contact, and the outer ends of two adjacent first iron core poles 21 form positioning slots. The positioning slots are flared in the radial direction of the iron core; in this embodiment, they are triangular. One end of the second iron core pole 22 is embedded in the positioning slot, and the other end is located outside the positioning slot. A coil slot 3 24 is formed between the ends of two adjacent second iron core poles 22 located outside the positioning slot. The axial width of the end of the second iron core pole 22 located outside the positioning groove is smaller than the axial width of the end of the second iron core pole 22 located inside the positioning groove. The axial width of the end of the second iron core pole 22 located inside the positioning groove is the same as the axial width of the first iron core pole 21. The second iron core pole 22 is provided with a hole 25 in the radial direction. The first iron core pole 21 located on both sides of the second iron core pole 22 is provided with an arc groove 26 corresponding to the hole 1. Two adjacent arc grooves 26 form a hole 2. The screw 1 passes through the hole 25 and the hole 2 in sequence and is threaded into the screw hole 16. After the iron core is fixed on the stator support by several screws 1, several second iron core poles 22 squeeze several first iron core poles 21 from the outside.

[0039] As a preferred embodiment, the outer end of screw 16 is embedded in hole 25 of iron core magnetic pole 2.

[0040] Coil slot 11, coil slot 23, and two coil slots 34 form a winding slot, and the coil (not shown in the figure) is located in the winding slot.

[0041] The stator for the external rotor motor disclosed in this embodiment first positions stator support 12 and stator support 23, then places iron core magnetic pole 21 between stator support 12 and stator support 23, then places iron core magnetic pole 22 between the two iron core magnetic poles 21, and uses screws to lock iron core magnetic pole 22 to stator support 23. Finally, stator support 12 and stator support 23 are locked together. After winding the coil, it can be assembled into a three-sided magnet rotor motor by combining it with the housing and drive shaft. The housing and drive shaft are existing mature products and can be freely selected according to the usage environment. Figure 9 The image is not fully shown; only two sets of axial permanent magnets 31 and one set of radial permanent magnets 32 are shown inside the housing.

Claims

1. A stator for an external rotor motor, comprising a stator support, an iron core, and coils, characterized in that: Several coil slots are provided on the outer side of the stator support; The iron core is fixed to the outside of the stator support. The iron core includes several iron core poles one and several iron core poles two arranged alternately. The iron core poles one form the inner ring part of the iron core, and the iron core poles two form the inner ring part of the iron core. The side of the iron core poles one is respectively provided with coil slots two. The inner end faces of two adjacent iron core poles one are in contact with each other, and the outer ends of two adjacent iron core poles one form a positioning groove. The positioning groove is flared in the radial direction of the iron core. One end of the iron core pole two is embedded in the positioning groove, and the other end is located outside the positioning groove. The ends of two adjacent iron core poles two located outside the positioning groove form a coil slot three. Coil slots one, two, and two coil slots three form a winding groove, and the coil is located in the winding groove.

2. The stator for an external rotor motor according to claim 1, characterized in that: The stator support includes a first stator support and a second stator support that are fixedly connected. The outer end faces of the first stator support and the second stator support are provided with several wire grooves. When the first stator support and the second stator support are fixedly connected, the wire grooves of the first stator support and the wire grooves of the second stator support are connected to form a coil groove.

3. The stator for an external rotor motor according to claim 2, characterized in that: Limiting rings are respectively provided on the far-away end faces of the stator support one and stator support two, and the inner side of the iron core is located between the two limiting rings.

4. The stator for an external rotor motor according to claim 1, characterized in that: The axial width of the end of the second iron core magnetic pole located outside the positioning groove is smaller than the axial width of the end of the second iron core magnetic pole located inside the positioning groove, and the axial width of the end of the second iron core magnetic pole located inside the positioning groove is the same as the axial width of the first iron core magnetic pole.

5. The stator for an external rotor motor according to claim 1, characterized in that: It also includes several screws, the stator bracket is provided with a screw hole extending in the radial direction, the iron core is provided with a through hole extending in the radial direction, and the screws pass through the through hole and are threadedly connected to the screw hole.

6. The stator for an external rotor motor according to claim 5, characterized in that: The iron core magnetic pole 2 is provided with a hole 1 in the radial direction. The iron core magnetic pole 1 is provided with a hole 2 corresponding to the through hole 1. The screw 1 passes through the hole 1 and the hole 2 in sequence and is threaded to the screw hole 1. When the iron core is fixed on the stator support by a number of screws 1, a number of iron core magnetic poles 2 squeeze a number of iron core magnetic poles 1 from the outside.

7. The stator for an external rotor motor according to claim 5, characterized in that: The second iron core magnetic pole is provided with a hole one in the radial direction. The first iron core magnetic pole is provided on both sides of the second iron core magnetic pole and is provided with an arc groove corresponding to the hole one. Two adjacent arc grooves form a hole two. The screw one passes through the hole one and the hole two in sequence and is threaded to the screw hole one. When the iron core is fixed on the stator support by several screws one, several second iron core magnetic poles squeeze several first iron core magnetic poles from the outside.

8. The stator for an external rotor motor according to claim 6 or 7, characterized in that: The outer end of the screw is embedded in the hole of the second iron core pole.

9. The stator for an external rotor motor according to claim 1, characterized in that: Both the first and second iron core magnetic poles are made of stacked silicon steel sheets.

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