Stator assembly and tangential magnetic circuit hub motor

Abstract

The utility model provides a stator assembly and tangential magnetic circuit hub motor wherein the stator assembly comprises a stator iron core, a support and a PCB, the stator iron core is sleeved and fixed on the support, the stator iron core comprises a yoke part and a plurality of tooth parts, the yoke part is annular, the plurality of tooth parts are distributed on the outer side of the yoke part at intervals along the circumferential direction of the yoke part and are fixedly connected with the yoke part, and the PCB is fixedly connected with the support. A plurality of tooth parts are arranged on the PCB, two adjacent tooth parts are encircled to form a stator groove, a stator winding is wound on the outer side of each tooth part, insulating sheets are arranged between the top and the bottom of each tooth part and the stator winding, one end of a plurality of stator groove openings in the plurality of stator grooves is provided with a Hall groove, a Hall sensor is arranged in the Hall groove, and the PCB is electrically connected with the Hall sensors. According to the utility model, the Hall slots are arranged on the slot openings of the stator slots, so that the influence of a magnetic field generated by electron current on the Hall sensors can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a stator assembly and a tangential magnetic circuit hub motor. Background Art

[0002] With the increasing adoption of electric vehicles, high-efficiency and high-power-density motors are gaining increasing attention. Most two-wheeled electric vehicles use outer rotor hub motors with surface-mounted magnets. These motors offer advantages such as simple structure and mature manufacturing processes, but further improvement in power density and efficiency is difficult. Therefore, the industry has begun exploring the use of outer rotor hub motors with tangential magnetic circuit structures. The reluctance torque of motors with this structure can account for over 40% of the total electromagnetic torque, significantly helping to increase power density through reluctance torque. However, due to the magnet slots in the outer rotor tangential magnetic circuit structure, each slot has a gap to minimize magnetic leakage, resulting in a discontinuous magnetic field around the outer rotor. When high current is applied to the stator winding, the stator magnetic field generated by the stator current couples with the magnetic field generated by the rotor magnets, distorting the air gap magnetic field. Hall sensors mounted on the stator core teeth are susceptible to this distorted magnetic field, causing Hall sensor positioning failure. Utility Model Content

[0003] The purpose of the utility model is to provide a stator assembly and a tangential magnetic circuit hub motor, which place the Hall slot on the notch of the stator slot, thereby reducing the influence of the magnetic field generated by the stator current on the Hall sensor.

[0004] The utility model is realized through the following technical solutions:

[0005] A stator assembly includes a stator core, a bracket, and a PCB board. The stator core is sleeved and fixed on the bracket. The stator core includes a yoke and multiple teeth. The yoke is annular. The multiple teeth are distributed at intervals along the circumference of the yoke and are fixedly connected to the yoke. Two adjacent teeth are arranged to form stator slots. Stator windings are wound around the outer sides of the teeth. Insulating sheets are provided between the tops and bottoms of the teeth and the stator windings. Hall slots are provided at one end of the slot openings of several of the multiple stator slots. Hall sensors are provided in the Hall slots. The PCB board is electrically connected to the Hall sensors.

[0006] Furthermore, the tooth portion includes a tooth body and two side wings, the two side wings are arranged on both sides of an end of the tooth body away from the yoke portion, the stator winding is wound on the tooth body, the two side wings located in the same stator slot are a group and divided into multiple groups, and the two side wings in the same group form a slot opening of the stator slot, and one end of two side wings in several groups of side wings is provided with a first notch to form a stator slot.

[0007] Furthermore, a first limiting protrusion is provided on an end of the first notch away from the tooth body, and a second limiting protrusion is provided on an end of the first notch close to the tooth body.

[0008] Furthermore, the stator core includes a plurality of stacked first punching sheets and a plurality of stacked second punching sheets, and a plurality of side wings among the plurality of side wings on the second punching sheets are provided with second notches at one end to form the first notches.

[0009] Furthermore, the plurality of first punching sheets and the plurality of second punching sheets are connected by rivets.

[0010] Furthermore, the stator slots gradually narrow from the middle to both sides.

[0011] Furthermore, a plurality of anti-rotation grooves are provided on the inner circumferential surface of the stator core, and the bracket is provided with anti-rotation protrusions respectively inserted into the plurality of anti-rotation grooves.

[0012] Furthermore, the stator windings on both sides of the Hall slot are in phase.

[0013] The utility model also provides a tangential magnetic circuit hub motor, which comprises the above-mentioned stator assembly.

[0014] Compared with the existing technology, the beneficial effects of the present invention are: the Hall slot is placed on the notch of the stator slot, so that the Hall sensor is less affected by the magnetic field generated by the stator current, thereby reducing the influence of the magnetic field generated by the stator current on the Hall sensor, improving the positioning accuracy of the Hall sensor, and avoiding the positioning failure of the Hall sensor; the present invention can be used for Hall control of radial magnetic circuits and tangential magnetic circuits, has high versatility, and can save motor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the stator assembly of the utility model;

[0016] Figure 2 It is a plan view of the stator core in the stator assembly of the present invention;

[0017] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0018] Figure 4 A plan view of the first punching sheet in the stator assembly of the utility model;

[0019] Figure 5 It is a plan view of the second punching sheet in the stator assembly of the present utility model;

[0020] Figure 6 for Figure 5 An enlarged schematic diagram of part B.

[0021] In the figure, 1-stator core, 11-yoke, 12-tooth, 121-tooth body, 122-side wing, 123-first notch, 124-first limiting protrusion, 125-second limiting protrusion, 13-stator slot, 14-Hall slot, 15-first punching sheet, 16-second punching sheet, 161-second notch, 17-anti-rotation groove, 2-bracket, 3-PCB board, 4-stator winding, 5-insulating sheet, 6-Hall sensor. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this utility model, the terms "first", "second", etc. are used only to distinguish the description and should not be understood as indicating or implying relative importance.

[0025] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the present invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0027] See also Figure 1 、 Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the structure of the stator assembly of the utility model. Figure 2 This is a plan view of the stator core in the stator assembly of the utility model. Figure 3 for Figure 2 An enlarged schematic diagram of part A of the embodiment of the present invention is provided. A stator assembly includes a stator core 1, a bracket 2, and a PCB board 3. The stator core 1 is sleeved and fixed on the bracket 2. The stator core 1 includes a yoke 11 and a plurality of teeth 12. The yoke 11 is annular. The plurality of teeth 12 are spaced apart along the circumference of the yoke 11 and are fixedly connected to the yoke 11. Two adjacent teeth 12 are arranged to form stator slots 13. Stator windings 4 are wound around the outside of the teeth 12. Insulating sheets 5 are provided between the top and bottom of the teeth 12 and the stator windings 4. Hall slots 14 are provided at one end of the notch of several of the plurality of stator slots 13. Hall sensors 6 are provided in the Hall slots 14. The PCB board 3 is electrically connected to the Hall sensors 6.

[0028] The stator assembly of the present invention places the Hall slot 14 on the notch of the stator slot 13, so that the Hall sensor 6 is less affected by the magnetic field generated by the stator current, thereby reducing the influence of the magnetic field generated by the electronic current on the Hall sensor 6, improving the positioning accuracy of the Hall sensor 6, and avoiding the positioning failure of the Hall sensor 6. Furthermore, the number of Hall slots 14 is at least three, and the distribution of the three or more Hall slots 14 on the circumference of the stator core 1 depends on the number of pole slots of the motor. For example, three Hall slots 14 are used for illustration, and the electrical angle of the three Hall slots 14 in space is within the range of 120°±10°. Specifically, the number of stator and rotor pole slots is 60 / 54 for illustration, and the three Hall slots 14 are respectively placed in the notches of the 1st, 4th, and 7th stator slots 13.

[0029] In one embodiment, the tooth portion 12 includes a tooth body 121 and two side wings 122. The two side wings 122 are disposed on either side of an end of the tooth body 121 away from the yoke 11. The stator winding 4 is wound around the tooth body 121. Two side wings 122 located in the same stator slot 13 are grouped together and divided into multiple groups. The two side wings 122 in the same group form the notch of the stator slot 13. In some groups of side wings 122, two side wings 122 have first notches 123 at one end to form the stator slot 13. A Hall slot 14 is formed between the first notches 123 of two corresponding side wings 122, so that the Hall slot 14 is positioned over the notch of the stator slot 13.

[0030] In one embodiment, a first limiting protrusion 124 is provided on the end of the first notch 123 away from the tooth body 121, and a second limiting protrusion 125 is provided on the end of the first notch 123 closer to the tooth body 121. This arrangement provides the Hall effect slot 14 with the first limiting protrusion 124 and the second limiting protrusion 125 at the top and bottom, respectively. The first limiting protrusion 124 and the second limiting protrusion 125 limit the position of the Hall effect sensor 6, thereby increasing the installation reliability of the Hall effect sensor 6. Furthermore, the installation of the Hall effect sensor 6 does not require an additional slot wedge structure to limit the position of the Hall effect sensor 6, thereby reducing the slot wedge structure material and assembly labor, thereby lowering costs.

[0031] Please refer to Figure 4 、 Figure 5 and Figure 6 , Figure 4 The plan view of the first punching sheet in the stator assembly of the utility model, Figure 5 This is a plan view of the second punching sheet in the stator assembly of the utility model. Figure 6 for Figure 5 An enlarged schematic diagram of part B. In one embodiment, the stator core 1 includes a plurality of superimposed first punching sheets 15 and a plurality of superimposed second punching sheets 16, and a second notch 161 is provided at one end of a plurality of side wings 122 on the second punching sheet 16 to form a first notch 123. The stator core 1 uses two types of punching sheets, a plurality of first punching sheets 15 are superimposed to form a first part, and then a plurality of second punching sheets 16 are superimposed on the bottom of the plurality of superimposed first punching sheets 15, thereby forming the stator core 1. In one embodiment, the plurality of first punching sheets 15 and the plurality of second punching sheets 16 are connected by rivets. Connecting the plurality of first punching sheets 15 and the plurality of second punching sheets 16 by rivets can prevent the relative movement of the first punching sheets 15 and the second punching sheets 16.

[0032] The side wing 122 of the first punching sheet 15 does not have a second notch 161, that is, the first punching sheet 15 does not have a Hall slot 14. However, one end of several side wings 122 on the second punching sheet 16 is provided with a second notch 161. When several second punching sheets 16 are stacked and connected, the second notch 161 on the second punching sheet 16 forms a first notch 123, that is, the second punching sheet 16 is provided with a Hall slot 14, so that it is convenient to form the first punching sheet 15 and the second punching sheet 16 by die stamping, thereby facilitating the processing and installation of the stator core 1. Furthermore, the stacking thickness and number of the first punching sheets 15 depend on the output performance requirements of the motor. The more first punching sheets 15 there are, the greater the output of the motor. The stacking thickness and number of the second punching sheets 16 depend on the axial height of the Hall sensor 6.

[0033] In one embodiment, the stator slots 13 gradually narrow from the middle to the sides. The stator slots 13 gradually narrow from the middle to the slot opening and the slot bottom, making the stator slots 13 slots of unequal width, which can increase the winding slot fill rate and improve the motor power density.

[0034] In one embodiment, the inner circumferential surface of the stator core 1 is provided with a plurality of anti-rotation grooves 17, and the bracket 2 is provided with anti-rotation protrusions that are respectively inserted into the plurality of anti-rotation grooves 17. The anti-rotation protrusions and anti-rotation grooves 17 are tightly matched to form a circumferential positioning and anti-rotation connection pair, preventing the stator core 1 from rotating.

[0035] In one embodiment, the stator windings 4 on both sides of the Hall slot 14 are in phase. This arrangement specifies the bottom line position of the stator winding 4, ensuring that the phases of the stator windings 4 on both sides of the Hall slot 14 are the same, thereby ensuring that the Hall sensor 6 is installed between the stator windings 4 with the same phase, reducing the impact of the magnetic field on the Hall sensor 6 during motor commutation. For example, if the number of stator and rotor pole slots is 60 / 54, and the three Hall slots 14 are placed in the slots of the 1st, 4th, and 7th stator slots 13, respectively, the winding parameters of the stator winding 4 are in the form of six parallel and three slots in series. Three adjacent slots in series form the U phase, three adjacent slots next to the U phase form the V phase, three adjacent slots next to the V phase form the W phase, and three adjacent slots next to the W phase form the U phase again, and so on.

[0036] The present invention also provides a tangential magnetic circuit hub motor, including the above-mentioned stator assembly. Since the tangential magnetic circuit hub motor of the present invention includes the stator assembly of any of the above-mentioned embodiments, it has all the technical effects of the above-mentioned stator assemblies, which will not be described in detail here.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A stator assembly, characterized in that: The stator core comprises a stator core, a bracket and a PCB board. The stator core is sleeved and fixed on the bracket. The stator core comprises a yoke and a plurality of teeth. The yoke is annular. The plurality of teeth are distributed at intervals along the circumference of the yoke and are fixedly connected to the yoke. Two adjacent teeth are arranged to form stator slots. Stator windings are wound around the outer sides of the teeth. Insulating sheets are provided between the tops and bottoms of the teeth and the stator windings. Hall slots are provided at one end of the notch openings of several of the stator slots. Hall sensors are provided in the Hall slots. The PCB board is electrically connected to the Hall sensors.

2. The stator assembly according to claim 1, characterized in that The tooth portion includes a tooth body and two side wings, the two side wings are arranged on both sides of one end of the tooth body away from the yoke portion, the stator winding is wound on the tooth body, the two side wings located in the same stator slot are grouped as a group and divided into multiple groups, and the two side wings in the same group form a notch of the stator slot, and one end of two side wings in several groups of side wings is provided with a first notch to form the stator slot.

3. The stator assembly according to claim 2, characterized in that A first limiting protrusion is provided on an end of the first notch away from the tooth body, and a second limiting protrusion is provided on an end of the first notch close to the tooth body.

4. The stator assembly according to claim 2, characterized in that The stator core includes a plurality of stacked first punching sheets and a plurality of stacked second punching sheets. Second notches are provided at one end of a plurality of side wings of the second punching sheets to form the first notches.

5. The stator assembly according to claim 4, characterized in that The first punches and the second punches are connected by rivets.

6. The stator assembly according to claim 1, wherein: The stator slots gradually narrow from the middle to both sides.

7. The stator assembly according to claim 1, characterized in that A plurality of anti-rotation grooves are provided on the inner circumferential surface of the stator core, and the bracket is provided with anti-rotation protrusions which are respectively inserted into the plurality of anti-rotation grooves.

8. The stator assembly according to claim 1, wherein: The stator windings on both sides of the Hall slot are in phase.

9. A tangential magnetic circuit hub motor, characterized in that: The invention comprises a stator assembly according to any one of claims 1 to 8.

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