Stator arrangement for an internal rotor electric machine and internal rotor electric machine

Abstract

The application relates to an inner rotor motor and a stator device thereof, wherein the stator device comprises a wire frame, a winding assembly and a wire assembly. The wire frame is annular and used for penetrating the rotor device, the wire frame has a first side and a second side which are away from each other in the axial direction, and the outer side of the wire frame is provided with a first clamping groove, a second clamping groove and a third clamping groove which are independent of each other; the winding assembly comprises a U-phase winding, a W-phase winding and a V-phase winding which are arranged on the wire frame, the outgoing end of the U-phase winding extends into the first clamping groove from the first side, the outgoing end of the W-phase winding extends into the second clamping groove from the first side, and the outgoing end of the V-phase winding extends into the third clamping groove from the first side; the wire assembly comprises a first wire, a second wire and a third wire, the first wire extends into the first clamping groove from the second side and is connected with the outgoing end of the U-phase winding, the second wire extends into the second clamping groove from the second side and is connected with the outgoing end of the W-phase winding, and the third wire extends into the third clamping groove from the second side and is connected with the outgoing end of the V-phase winding.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a stator device of an inner rotor electric machine and the inner rotor electric machine. BACKGROUND

[0002] With the rapid development of modern electric machine technology, the design and manufacturing of electric machines are facing increasingly fierce market competition. In particular, in the fields of electric tools and household appliances, the size, power density and cost of electric machines have become key competitive factors. In order to meet the needs of customers for product miniaturization, lightweight and high efficiency, the optimization of electric machine structure and the rationality of material use become particularly important.

[0003] In electric machine design, inner rotor electric machines are widely used in various high-power electric tools and equipment due to their high speed, simple structure, good heat dissipation performance and other advantages.

[0004] However, the design of inner rotor electric machines often faces the limitation of axial length while meeting high power output, especially in the implementation of winding connection methods. In the prior art, short-circuit ring or PCB overcurrent methods are usually used to realize the parallel connection of windings, and these two methods have their own advantages and disadvantages:

[0005] One is to use a short-circuit ring structure. Although this structure can realize automatic assembly, in a multi-winding electric machine, a short-circuit ring needs to be connected between each winding, resulting in an increase in the axial length of the electric machine, an increase in the overall volume, and an increase in the manufacturing cost. Under the urgent demand of the market for low cost and small size, this solution is not ideal.

[0006] The second is the PCB overcurrent structure. This scheme realizes the transition of current by increasing a PCB on the top of the winding. Although it can shorten the axial length of the electric machine to a certain extent, the current density it carries is limited, and it is prone to overheating and unstable performance in high-current applications. In addition, the Hall sensor on the PCB may be affected by temperature, thereby affecting the control accuracy of the electric machine.

[0007] Based on the limitations of the above prior art, there is an urgent need for a new solution to minimize the axial length and material cost of the electric machine while maintaining the output power of the electric machine, thereby improving market competitiveness and product reliability.

[0008] The above information disclosed in the background of the present application is only for understanding the background of the concept of the present application, and does not indicate or imply that it contains prior art information. SUMMARY

[0009] Therefore, it is necessary to provide a stator device of an inner rotor electric machine and the inner rotor electric machine to solve the above problems.

[0010] The application provides a stator device of an inner rotor motor, which comprises:

[0011] A wire holder in a ring shape and used for the inner rotor motor to pass through, the wire holder has a first side and a second side away from each other in the axial direction, and the outer side of the wire holder is provided with a first clamping groove, a second clamping groove and a third clamping groove which are independent of each other;

[0012] A winding assembly comprising a U-phase winding, a W-phase winding and a V-phase winding arranged on the wire holder, the outgoing end of the U-phase winding extends into the first clamping groove from the first side, the outgoing end of the W-phase winding extends into the second clamping groove from the first side, and the outgoing end of the V-phase winding extends into the third clamping groove from the first side; and

[0013] A wire assembly comprising a first wire, a second wire and a third wire, the first wire extends into the first clamping groove from the second side and is connected with the outgoing end of the U-phase winding, the second wire extends into the second clamping groove from the second side and is connected with the outgoing end of the W-phase winding, and the third wire extends into the third clamping groove from the second side and is connected with the outgoing end of the V-phase winding.

[0014] The stator device of the inner rotor motor can achieve the following beneficial effects:

[0015] By reasonably arranging the connection layout of the outgoing ends of the U-phase winding, the W-phase winding and the V-phase winding and the first wire, the second wire and the third wire in the first clamping groove, the second clamping groove and the third clamping groove on the outer side of the wire holder, the axial length of the motor can be effectively reduced, so that the compact design of the motor is realized, the market demand for miniaturization and light weight is met, the connection of the outgoing ends of the windings and the wires is more convenient by using the clamping groove structure, the complexity of the traditional short circuit ring and the PCB overcurrent structure is reduced, the assembly efficiency is improved, and the production cost is reduced, the heat dissipation performance of the motor can be effectively improved due to the optimized layout of the windings and the wires, the risk of overheating is reduced, so that the working stability and reliability of the motor are improved, the current carrying capacity is improved by the reasonable wire layout and connection mode, the overheating problem caused by the current density is reduced, and the performance stability of the motor in high power application is ensured.

[0016] In some embodiments, the stator device of the inner rotor motor further comprises a first buckle, a second buckle and a third buckle. The first buckle is located in the first buckle groove and buckled to the connection between the outgoing line end of the U-phase winding and the first lead wire. The second buckle is located in the second buckle groove and buckled to the connection between the outgoing line end of the W-phase winding and the second lead wire. The third buckle is located in the third buckle groove and buckled to the connection between the outgoing line end of the V-phase winding and the third lead wire. By using the first buckle, the second buckle and the third buckle, the connection between the outgoing line end of the U-phase winding, the W-phase winding and the V-phase winding and the first lead wire, the second lead wire and the third lead wire can be quickly and conveniently completed during assembly, reducing the dependence on complex connection tools, improving production efficiency, and preventing connection loosening caused by vibration or thermal expansion during motor operation, thereby improving the reliability and durability of the motor. The design of the buckle can also effectively disperse external forces, so that the tension of the first lead wire, the second lead wire and the third lead wire is not directly transmitted to the outgoing line end of the U-phase winding, the W-phase winding and the V-phase winding, reducing the mechanical stress borne by the outgoing line end of the U-phase winding, the W-phase winding and the V-phase winding, thereby reducing the risk of failure caused by the outgoing line end of the U-phase winding, the W-phase winding and the V-phase winding being pulled apart or lengthened.

[0017] In some embodiments, a first limiting groove is recessed in the middle of the first buckle groove, and the first buckle is embedded in the first limiting groove to limit the axial movement of the first buckle in the first buckle groove. The design of the first limiting groove can effectively limit the axial movement of the first buckle in the first buckle groove, ensuring that the buckle always remains in the predetermined position. This limitation can prevent changes in the position of the buckle due to vibration or external forces, thereby maintaining a stable connection between the first lead wire and the outgoing line end of the U-phase winding, avoiding connection loosening due to external impact or vibration during motor operation, and ensuring normal operation of the motor.

[0018] In some embodiments, a second limiting groove is recessed in the middle of the second buckle groove, and the second buckle is embedded in the second limiting groove to limit the axial movement of the second buckle in the second buckle groove. The design of the second limiting groove can effectively limit the axial movement of the second buckle in the second buckle groove, ensuring that the buckle always remains in the predetermined position. This limitation can prevent changes in the position of the buckle due to vibration or external forces, thereby maintaining a stable connection between the second lead wire and the outgoing line end of the W-phase winding, avoiding connection loosening due to external impact or vibration during motor operation, and ensuring normal operation of the motor.

[0019] In some embodiments, a third limiting groove is formed in the middle of the third clamping groove, and the third clamping buckle is embedded in the third limiting groove to limit the axial movement of the third clamping buckle in the second clamping groove. The design of the third limiting groove can effectively limit the axial movement of the third clamping buckle in the third clamping groove, ensuring that the clamping buckle always remains in the predetermined position. This limitation can prevent the change of the position of the clamping buckle due to vibration or external force, thereby maintaining the stable connection between the third lead wire and the outlet end of the V-phase winding, avoiding the loosening of the connection due to external impact or vibration during the operation of the motor, and ensuring the normal operation of the motor.

[0020] In some embodiments, the stator device of the internal rotor motor further comprises a stator core, the wire holder comprises a ring-shaped main body, a first fixed part, a second fixed part and a third fixed part, the stator core is arranged on the outer side circumferential surface of the main body, the winding assembly is arranged on the inner side circumferential surface of the main body, the main body is used for passing the rotor device and has the first side and the second side away from each other in the axial direction, one end of the first fixed part is connected with the first side circumferential edge of the main body, the other end of the first fixed part extends towards the second side, the first clamping groove is formed in the first fixed part, one end of the second fixed part is connected with the first side circumferential edge of the main body, the other end of the second fixed part extends towards the second side, the second clamping groove is formed in the second fixed part, one end of the third fixed part is connected with the first side circumferential edge of the main body, the other end of the third fixed part extends towards the second side, and the third clamping groove is formed in the third fixed part.

[0021] In some embodiments, the stator device of the internal rotor motor further comprises an end cover, the end cover comprises a cover body and a first covering part, a second covering part and a third covering part connected to the circumferential edge of the cover body, the cover body covers the first side, the first covering part covers the first clamping groove to limit the radial movement of the first clamping buckle in the first clamping groove, the second covering part covers the second clamping groove to limit the radial movement of the second clamping buckle in the second clamping groove, and the third covering part covers the third clamping groove to limit the radial movement of the third clamping buckle in the third clamping groove. The cover body of the end cover and the covering parts on the circumferential edge thereof provide comprehensive coverage for the clamping grooves and clamping buckles, preventing the influence of external environmental factors such as dust and moisture on the clamping buckles and lead wires, thereby improving the durability and reliability of the motor. The first covering part, the second covering part and the third covering part are respectively arranged in the corresponding first clamping groove, the second clamping groove and the third clamping groove, which can effectively limit the radial movement of each clamping buckle. This design ensures that the clamping buckle always remains in the correct position, avoiding loosening or displacement due to external force or vibration, thereby enhancing the stability of the connection.

[0022] In some embodiments, the two sides of any one of the first cover portion, the second cover portion and the third cover portion are provided with a limiting protrusion along the length extension direction, the two sides of any one of the first fixing portion, the second fixing portion and the third fixing portion are provided with a limiting sliding groove matched with the limiting protrusion, and the limiting protrusion is slidably connected into the limiting sliding groove. The sliding connection design of the limiting protrusion and the limiting sliding groove facilitates higher accuracy and flexibility in the assembly process, and the sliding connection can also adapt to small errors that may occur in the production and assembly process, ensuring good cooperation between components. The cooperation design of the limiting protrusion and the limiting sliding groove can form effective limiting between the cover portion and the fixing portion, preventing unnecessary displacement of the components during assembly or operation. This design ensures that each component can remain in the correct relative position, avoiding loosening caused by vibration or external force. In other words, by providing the limiting protrusion on the two sides of the first cover portion, the second cover portion and the third cover portion, and providing the limiting sliding groove matched with the limiting protrusion on the two sides of the first fixing portion, the second fixing portion and the third fixing portion, the sliding connection is formed, which not only enhances the structural stability and assembly accuracy of the motor stator device, improves the overall performance and reliability of the motor, but also facilitates assembly.

[0023] In some embodiments, the two sides of any one of the first cover portion, the second cover portion and the third cover portion are provided with a limiting sliding groove along the length extension direction, the two sides of any one of the first fixing portion, the second fixing portion and the third fixing portion are provided with a limiting protrusion matched with the limiting sliding groove, and the limiting protrusion is slidably connected into the limiting sliding groove. The sliding connection design of the limiting protrusion and the limiting sliding groove facilitates higher accuracy and flexibility in the assembly process, and the sliding connection can also adapt to small errors that may occur in the production and assembly process, ensuring good cooperation between components. The cooperation design of the limiting protrusion and the limiting sliding groove can form effective limiting between the cover portion and the fixing portion, preventing unnecessary displacement of the components during assembly or operation. This design ensures that each component can remain in the correct relative position, avoiding loosening caused by vibration or external force. In other words, by providing the limiting sliding groove on the two sides of the first cover portion, the second cover portion and the third cover portion, and providing the limiting protrusion matched with the limiting sliding groove on the two sides of the first fixing portion, the second fixing portion and the third fixing portion, the sliding connection is formed, which not only enhances the structural stability and assembly accuracy of the motor stator device, improves the overall performance and reliability of the motor, but also facilitates assembly.

[0024] In some embodiments, the spool further comprises six winding portions arranged at intervals on the inner side of the main body, the winding assembly comprises six coils wound on the six winding portions respectively, the spool further comprises a plurality of limiting portions arranged at intervals on the first side of the main body along the circumferential direction of the main body, and the outlet of the wire is formed between two adjacent limiting portions, the outlet of the wire of the plurality of coils passes through the limiting portion to form the outlet of the U-phase winding, the outlet of the W-phase winding and the outlet of the V-phase winding, and the cover is arranged on the limiting portion and is threadedly connected with the limiting portion. Six winding portions are evenly distributed around the inner side of the main body, providing sufficient space and support for each coil to be effectively wound thereon. This design ensures the uniformity and consistency of the coils, helping to improve the performance and efficiency of the motor. A plurality of limiting portions are arranged at intervals along the circumferential direction of the main body, which can effectively limit the movement and position of the outlet of the coil, ensuring that it does not displace or loosen during operation, thereby improving the stability and reliability of the motor. The outlet formed between adjacent limiting portions provides a convenient passage for the outlet of the coil, forming the outlet of the U-phase, W-phase and V-phase windings. This design simplifies electrical connections and reduces wiring complexity. The cover is arranged on the limiting portion and is threadedly connected with the limiting portion, further enhancing the stability of the overall structure. The cover not only provides physical protection against external environmental influences on the coils, but also ensures a tight fit between the various components through threaded connections, improving mechanical strength.

[0025] In some embodiments, the outgoing ends of the U-phase winding, the outgoing ends of the W-phase winding, and the outgoing ends of the V-phase winding are each sleeved with an insulating tube. The insulating tube can be an insulating fiber tube or the like. The main function of the insulating tube is to provide electrical insulation, prevent accidental contact between the outgoing ends and other conductive components, and avoid short circuit or leakage phenomena, thereby improving the safety and reliability of the motor. Through the insulation treatment of the outgoing ends, the influence of electromagnetic interference on the operation of the motor can be effectively reduced, ensuring that the motor will not be disturbed by external electromagnetic fields during high-efficiency operation, and improving the performance stability of the motor. The use of the insulating tube can make the installation and connection of the outgoing ends more convenient, and the operator can handle the cables more easily during electrical connection, reducing the risk of failure caused by misoperation. The use of the insulating tube can make the outgoing ends of the motor look more neat and beautiful, avoiding the disorder and safety hazards that may be caused by exposed cables, thereby improving the overall appearance quality of the product. Due to the protection of the insulating tube, the outgoing ends of the motor are not easily damaged during maintenance and repair, and the operator can operate more conveniently during inspection or replacement, reducing the maintenance difficulty. The insulating tube can be made of different materials and thicknesses according to different working environments and conditions to provide better adaptability and ensure the normal operation of the motor under various conditions. In summary, by sleeving the outgoing ends of the U-phase, W-phase, and V-phase windings with insulating tubes, not only the electrical safety is enhanced to prevent short circuits and interference, but also the durability and maintenance convenience of the motor are improved. This design not only improves the performance and reliability of the motor, but also provides protection for use and maintenance.

[0026] The application also provides an internal rotor motor comprising a rotor device and a stator device as described in any of the above embodiments.

[0027] The internal rotor motor described above, due to the inclusion of the stator device described in any of the above embodiments, also at least includes the following beneficial effects: by reasonably arranging the connection layout of the outgoing ends of the U-phase winding, the outgoing ends of the W-phase winding, and the outgoing ends of the V-phase winding and the first conductor, the second conductor, and the third conductor in the first clamping groove, the second clamping groove, and the third clamping groove on the outer side of the bobbin, the axial length of the motor can be effectively reduced, thereby realizing the compact design of the motor and meeting the market demand for miniaturization and lightweight; the use of the clamping groove structure makes the connection of the outgoing ends of the windings and the conductors more convenient, reduces the complexity of traditional short-circuit rings and PCB overcurrent structures, improves assembly efficiency, and reduces production costs; due to the optimized layout of the windings and conductors, the heat dissipation performance of the motor can be effectively improved, the risk of overheating can be reduced, the working stability and reliability of the motor can be improved, and the reasonable conductor layout and connection method can also improve the current carrying capacity and reduce the overheating problem caused by current density, ensuring the performance stability of the motor in high-power applications. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0029] Figure 1 A structural schematic diagram of an inner rotor motor is provided for an embodiment of the present application.

[0030] Figure 2 A sectional view of an inner rotor motor is provided for an embodiment of the present application.

[0031] Figure 3 An exploded schematic diagram of an inner rotor motor is provided for an embodiment of the present application.

[0032] Figure 4 An exploded schematic diagram of a stator device of an inner rotor motor is provided for an embodiment of the present application.

[0033] Figure 5 A structural perspective view of a wire holder of a stator device is provided for an embodiment of the present application.

[0034] Figure 6 A structural perspective view of an end cover of a wire holder of a stator device is provided for an embodiment of the present application.

[0035] Figure 7 A circuit schematic diagram of a winding assembly is provided for an embodiment of the present application.

[0036] Figure 8 A comparison diagram of axial lengths of end portions of an inner rotor motor with two conventional short-circuit ring designs and the inner rotor motor of the present application is provided for an embodiment of the present application.

[0037] Reference signs:

[0038] 10, inner rotor motor; 11, stator device; 12, rotor device; 100, wire holder; 110, first fixing part; 111, first clamping groove; 112, first limiting groove; 120, second fixing part; 121, second clamping groove; 122, second limiting groove; 130, third fixing part; 131, third clamping groove; 132, third limiting groove; 140, main body; 141, first side; 142, second side; 150, limiting sliding groove; 160, winding part; 170, limiting part; 180, wire outlet; 200, winding assembly; 210, U-phase winding; 220, W-phase winding; 230, V-phase winding; 240, coil; 300, wire assembly; 310, first wire; 320, second wire; 330, third wire; 410, first buckle; 420, second buckle; 430, third buckle; 500, end cover; 510, first covering part; 520, second covering part; 530, third covering part; 540, cover body; 550, limiting protruding rib; 600, stator core. DETAILED DESCRIPTION

[0039] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0040] Reference will now be made to Figures 1 to 8In some embodiments, the application provides a stator device 11 of an inner rotor motor 10, which comprises a bobbin 100, a winding assembly 200 and a wire assembly 300. The bobbin 100 is annular and used for passing the rotor device 12, the bobbin 100 has a first side 141 and a second side 142 away from each other along the axial direction, and the outer periphery of the bobbin 100 is formed with a first clamping groove 111, a second clamping groove 121 and a third clamping groove 131 which are independent of each other; the winding assembly 200 comprises a U-phase winding 210, a W-phase winding 220 and a V-phase winding 230 arranged on the bobbin 100, the outgoing line end of the U-phase winding 210 extends into the first clamping groove 111 from the first side 141, the outgoing line end of the W-phase winding 220 extends into the second clamping groove 121 from the first side 141, and the outgoing line end of the V-phase winding 230 extends into the third clamping groove 131 from the first side 141; the wire assembly 300 comprises a first wire 310, a second wire 320 and a third wire 330, the first wire 310 extends into the first clamping groove 111 from the second side 142 and is connected with the outgoing line end of the U-phase winding 210, the second wire 320 extends into the second clamping groove 121 from the second side 142 and is connected with the outgoing line end of the W-phase winding 220, and the third wire 330 extends into the third clamping groove 131 from the second side 142 and is connected with the outgoing line end of the V-phase winding 230.

[0041] The stator device 11 of the inner rotor motor 10 can at least achieve the following beneficial effects:

[0042] By reasonably arranging the connection layout of the outgoing line ends of the U-phase winding 210, the W-phase winding 220 and the V-phase winding 230 and the first wire 310, the second wire 320 and the third wire 330 in the first clamping groove 111, the second clamping groove 121 and the third clamping groove 131 on the outer periphery of the bobbin 100, the axial length of the motor can be effectively reduced, so that the compact design of the motor is realized, and the market demand for miniaturization and light weight is met; the clamping groove structure is adopted, the connection of the outgoing line ends of the windings and the wires is more convenient, the complexity of the traditional short circuit ring and the PCB overcurrent structure is reduced, the assembly efficiency is improved, and the production cost is reduced; due to the optimized layout of the windings and the wires, the heat dissipation performance of the motor can be effectively improved, and the risk of overheating is reduced, so that the working stability and reliability of the motor are improved, and the reasonable wire layout and connection mode can also improve the current carrying capacity and reduce the overheating problem caused by the current density, so as to ensure the performance stability of the motor in high power application.

[0043] As Figure 2 and Figure 4As shown, in some embodiments, the stator device 11 of the inner rotor motor 10 further comprises a first buckle 410, a second buckle 420 and a third buckle 430. The first buckle 410 is located in the first clamping groove 111 and buckled to the connection between the outgoing line end of the U-phase winding 210 and the first lead wire 310. The second buckle 420 is located in the second clamping groove 121 and buckled to the connection between the outgoing line end of the W-phase winding 220 and the second lead wire 320. The third buckle 430 is located in the third clamping groove 131 and buckled to the connection between the outgoing line end of the V-phase winding 230 and the third lead wire 330. By using the first buckle 410, the second buckle 420 and the third buckle 430, the connection between the outgoing line end of the U-phase winding 210, the W-phase winding 220 and the V-phase winding 230 and the first lead wire 310, the second lead wire 320 and the third lead wire 330 can be quickly and conveniently completed during assembly, reducing the dependence on complex connection tools, improving production efficiency, and preventing connection loosening caused by vibration or thermal expansion during motor operation, thereby improving the reliability and durability of the motor. The design of the buckle can also effectively disperse the action of external force, so that the tension of the first lead wire 310, the second lead wire 320 and the third lead wire 330 is not directly transmitted to the outgoing line end of the U-phase winding 210, the W-phase winding 220 and the V-phase winding 230, reducing the mechanical stress borne by the outgoing line end of the U-phase winding 210, the W-phase winding 220 and the V-phase winding 230, thereby reducing the risk of failure caused by the outgoing line end of the U-phase winding 210, the W-phase winding 220 and the V-phase winding 230 being pulled apart or lengthened.

[0044] As shown in Figure 4 and Figure 5 As shown, in some embodiments, the middle part of the first clamping groove 111 is concave and forms a first limiting groove 112, and the first buckle 410 is embedded in the first limiting groove 112 to limit the axial movement of the first buckle 410 in the first clamping groove 111. The design of the first limiting groove 112 can effectively limit the axial movement of the first buckle 410 in the first clamping groove 111, ensuring that the buckle always remains in the predetermined position. This limitation can prevent the change of the buckle position caused by vibration or external force, thereby maintaining the stable connection between the first lead wire 310 and the outgoing line end of the U-phase winding 210, avoiding the loosening of the connection caused by external impact or vibration during motor operation, and ensuring the normal work of the motor.

[0045] As shown in Figure 4 and Figure 5As shown, in some embodiments, a second limiting groove 122 is formed in the middle of the second clamping groove 121, and the second clamping buckle 420 is embedded in the second limiting groove 122 to limit the axial movement of the second clamping buckle 420 in the second clamping groove 121. The design of the second limiting groove 122 can effectively limit the axial movement of the second clamping buckle 420 in the second clamping groove 121, ensuring that the clamping buckle always remains in a predetermined position. Such limitation can prevent the change of the position of the clamping buckle due to vibration or external force, thereby maintaining the stable connection between the second lead wire 320 and the outgoing end of the W-phase winding 220, avoiding the loosening of the connection due to external impact or vibration during the operation of the motor, and ensuring the normal operation of the motor.

[0046] As shown, Figure 4 and Figure 5 As shown, in some embodiments, a third limiting groove 132 is formed in the middle of the third clamping groove 131, and the third clamping buckle 430 is embedded in the third limiting groove 132 to limit the axial movement of the third clamping buckle 430 in the second clamping groove 121. The design of the third limiting groove 132 can effectively limit the axial movement of the third clamping buckle 430 in the third clamping groove 131, ensuring that the clamping buckle always remains in a predetermined position. Such limitation can prevent the change of the position of the clamping buckle due to vibration or external force, thereby maintaining the stable connection between the third lead wire 330 and the outgoing end of the V-phase winding 230, avoiding the loosening of the connection due to external impact or vibration during the operation of the motor, and ensuring the normal operation of the motor.

[0047] As shown, Figure 3 and Figure 4As shown, in some embodiments, the stator device 11 of the inner rotor motor 10 further comprises a stator core 600, the bobbin 100 comprises a main body 140 in the form of a ring, a first fixed portion 110, a second fixed portion 120, and a third fixed portion 130, the stator core 600 is arranged on the outer side circumferential surface of the main body 140, the winding assembly 200 is arranged on the inner side circumferential surface of the main body 140, the main body 140 is used for the rotor device 12 to pass through and has the first side 141 and the second side 142 away from each other in the axial direction, one end of the first fixed portion 110 is connected with the first side 141 circumferential edge of the main body 140, the other end of the first fixed portion 110 is arranged extending towards the second side 142, the first clamping groove 111 is arranged on the first fixed portion 110, one end of the second fixed portion 120 is connected with the first side 141 circumferential edge of the main body 140, the other end of the second fixed portion 120 is arranged extending towards the second side 142, the second clamping groove 121 is arranged on the second fixed portion 120, one end of the third fixed portion 130 is connected with the first side 141 circumferential edge of the main body 140, the other end of the third fixed portion 130 is arranged extending towards the second side 142, and the third clamping groove 131 is arranged on the third fixed portion 130.

[0048] As shown, Figure 4 and Figure 5 As shown, in some embodiments, the stator device 11 of the inner rotor motor 10 further comprises an end cover 500, the end cover 500 comprises a cover body 540 and a first covering portion 510, a second covering portion 520, and a third covering portion 530 connected to the circumferential edge of the cover body 540, the cover body 540 is arranged on the first side 141, the first covering portion 510 is arranged on the first clamping groove 111 to limit the radial movement of the first clasp 410 in the first clamping groove 111, the second covering portion 520 is arranged on the second clamping groove 121 to limit the radial movement of the second clasp 420 in the second clamping groove 121, and the third covering portion 530 is arranged on the third clamping groove 131 to limit the radial movement of the third clasp 430 in the third clamping groove 131. The cover body 540 of the end cover 500 and the covering portions on its circumferential edge provide comprehensive coverage for the clamping grooves and clamps, preventing external environmental factors such as dust and moisture from affecting the clamps and wires, thereby improving the durability and reliability of the motor. The first covering portion 510, the second covering portion 520, and the third covering portion 530 are respectively arranged on the corresponding first clamping groove 111, the second clamping groove 121, and the third clamping groove 131, effectively limiting the radial movement of each clamp. This design ensures that the clamps always remain in the correct position, avoiding loosening or displacement caused by external forces or vibrations, thereby enhancing the stability of the connection.

[0049] As shown, Figure 5and Figure 6 As shown in some embodiments, the first cover part 510, the second cover part 520 and the third cover part 530 are provided with a limiting protrusion 550 on both sides of any one of the three parts in the length extension direction, and the first fixing part 110, the second fixing part 120 and the third fixing part 130 are provided with a limiting sliding groove matched with the limiting protrusion 550 on both sides of any one of the three parts, and the limiting protrusion 550 is slidably connected into the limiting sliding groove 150. The sliding connection design of the limiting protrusion 550 and the limiting sliding groove facilitates higher precision and flexibility during assembly, and such sliding connection can also adapt to small errors that may occur during production and assembly, ensuring good cooperation between components. The cooperation design of the limiting protrusion 550 and the limiting sliding groove can form effective limiting between the cover part and the fixing part, preventing unnecessary displacement of the components during assembly or operation. Such design ensures that each part can maintain the correct relative position and avoid loosening due to vibration or external force. In other words, by providing the limiting protrusion 550 on both sides of the first cover part 510, the second cover part 520 and the third cover part 530 and providing the limiting sliding groove matched with the limiting protrusion 550 on both sides of the first fixing part 110, the second fixing part 120 and the third fixing part 130 to form a sliding connection, not only the structural stability and assembly precision of the motor stator device 11 are enhanced, but also the overall performance and reliability of the motor are improved, and the assembly is facilitated.

[0050] In some embodiments, the first cover portion 510, the second cover portion 520, and the third cover portion 530 each have a limiting groove on both sides along the length extension direction, and the first fixing portion 110, the second fixing portion 120, and the third fixing portion 130 each have a limiting protrusion 550 on both sides that is adapted to the limiting groove, and the limiting protrusion 550 is slidably connected to the limiting groove 150. The sliding connection design of the limiting protrusion 550 and the limiting groove facilitates higher precision and flexibility during assembly, and can also accommodate small errors that may occur during production and assembly, ensuring good cooperation between components. The cooperation design of the limiting protrusion 550 and the limiting groove can form effective limiting between the cover portion and the fixing portion, preventing unnecessary displacement of the components during assembly or operation. This design ensures that each component can maintain the correct relative position and avoid loosening due to vibration or external force. In other words, by providing a limiting groove on both sides of the first cover portion 510, the second cover portion 520, and the third cover portion 530, and providing a limiting protrusion 550 on both sides of the first fixing portion 110, the second fixing portion 120, and the third fixing portion 130 that is adapted to the limiting groove, a sliding connection is formed, which not only enhances the structural stability and assembly precision of the motor stator device 11, improves the overall performance and reliability of the motor, but also facilitates assembly.

[0051] As Figure 4As shown, in some embodiments, the bobbin 100 further includes six winding portions 160 spaced around the inner circumference of the main body 140, the winding assembly 200 includes six coils 240 wound around the six winding portions 160 respectively, the bobbin 100 further includes a plurality of limiting portions 170 arranged along the circumference of the main body 140, the limiting portions 170 are arranged on the first side 141 of the main body 140, and the limiting portions 170 are spaced along the circumference of the main body 140, the outlet ports 180 are formed between adjacent limiting portions 170, the outlet ends of the coils 240 pass through the limiting portions 170 from the outlet ports 180 to form the outlet ends of the U-phase winding 210, the W-phase winding 220 and the V-phase winding 230, and the cover 540 is arranged on the limiting portions 170 and is threadedly connected with the limiting portions 170. The six winding portions 160 are evenly distributed around the inner circumference of the main body 140, providing sufficient space and support for each coil 240 to be effectively wound thereon. This design ensures the uniformity and consistency of the coils 240, which helps to improve the performance and efficiency of the motor. The plurality of limiting portions 170 are spaced along the circumference of the main body 140, which can effectively limit the movement and position of the outlet ends of the coils 240, ensuring that they do not shift or loosen during operation, thereby improving the stability and reliability of the motor. The outlet ports 180 formed between adjacent limiting portions 170 provide a convenient passage for the outlet ends of the coils 240, forming the outlet ends of the U-phase, W-phase and V-phase windings 230. This design simplifies the electrical connection and reduces the complexity of wiring. The cover 540 is arranged on the limiting portions 170 and is threadedly connected therewith, further enhancing the stability of the overall structure. The cover 540 not only provides physical protection against external environmental influences on the coils 240, but also ensures the close coupling between the various components through threaded connection, improving the mechanical strength.

[0052] In some embodiments, the outgoing ends of the U-phase winding 210, the W-phase winding 220, and the V-phase winding 230 are each sleeved with an insulating tube. The insulating tube can be an insulating fiber tube or the like. The main function of the insulating tube is to provide electrical insulation, prevent accidental contact between the outgoing end and other conductive components, and avoid short circuit or electric leakage, thereby improving the safety and reliability of the motor. By insulating the outgoing end, the influence of electromagnetic interference on the operation of the motor can be effectively reduced, ensuring that the motor will not be disturbed by external electromagnetic fields during efficient operation, and improving the performance stability of the motor. The use of the insulating tube can make the installation and connection of the outgoing end more convenient, and the operator can handle the cable more easily during electrical connection, reducing the risk of failure due to misoperation. The use of the insulating tube can make the outgoing end of the motor look more neat and beautiful, avoiding the disorder and safety hazards that may be caused by exposed cables, thereby improving the overall appearance quality of the product. Due to the protection of the insulating tube, the outgoing end of the motor is not easily damaged during maintenance and repair, and the operator can operate more conveniently during inspection or replacement, reducing the difficulty of maintenance. The insulating tube can be made of different materials and thicknesses according to different working environments and conditions to provide better adaptability and ensure the normal operation of the motor under various conditions. In summary, by sleeving the outgoing ends of the U-phase, W-phase, and V-phase windings 230 with insulating tubes, not only the electrical safety is enhanced to prevent short circuit and interference, but also the durability and maintenance convenience of the motor are improved. This design not only improves the performance and reliability of the motor, but also provides protection for use and maintenance.

[0053] In addition, as shown in Figure 1 and Figure 3 The application also provides an internal rotor motor 10, which comprises a rotor device 12 and a stator device 11 as described in any of the above embodiments.

[0054] The inner rotor motor 10 comprises the stator device 11 of any of the above embodiments, and has at least the following beneficial effects: the connection of the outgoing ends of the U-phase winding 210, the W-phase winding 220 and the V-phase winding 230 and the first wire 310, the second wire 320 and the third wire 330 is arranged in the first clamping groove 111, the second clamping groove 121 and the third clamping groove 131 outside the wire frame 100, which can effectively reduce the axial length of the motor, so as to realize the compact design of the motor and meet the market demand for miniaturization and light weight; the clamping groove structure is adopted, the connection of the outgoing ends of the windings and the wires is more convenient, the complexity of the traditional short circuit ring and the PCB overcurrent structure is reduced, the assembly efficiency is improved, and the production cost is reduced; due to the optimized layout of the windings and the wires, the heat dissipation performance of the motor can be effectively improved, the risk of overheating is reduced, the working stability and reliability of the motor are improved, and the reasonable wire layout and connection mode can also improve the current carrying capacity and reduce the overheating problem caused by the current density, so as to ensure the performance stability of the motor in high power application.

[0055] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as the scope of the description.

[0056] The above embodiments only express several implementation manners of the application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the application, some modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

[0057] In the description of the application, it should be understood that the terms "axial", "radial", "circumferential", "length", "width", "thickness", "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0058] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of the indicated technical features. Thus, the features defined with "first", "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0059] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0060] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] It should be noted that when an element is referred to as "on", "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0062] In the description of the present specification, the description referring to the terms "one embodiment", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. Descriptive descriptions of the above terms in the present specification do not necessarily refer to the same embodiment or example. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

Claims

1. A stator arrangement for an internal rotor electric machine, characterized in that The stator device of the internal rotor motor comprises a wire frame, a winding assembly, and a wire assembly. The wire frame is annular and used for the rotor device to pass through, has a first side and a second side away from each other in the axial direction, and the outer side of the wire frame is provided with a first clamping groove, a second clamping groove, and a third clamping groove which are independent of each other. The winding assembly comprises a U-phase winding, a W-phase winding, and a V-phase winding arranged on the wire frame, the outgoing wire end of the U-phase winding extends into the first clamping groove from the first side, the outgoing wire end of the W-phase winding extends into the second clamping groove from the first side, and the outgoing wire end of the V-phase winding extends into the third clamping groove from the first side. The wire assembly comprises a first wire, a second wire, and a third wire, the first wire extends into the first clamping groove from the second side and is connected with the outgoing wire end of the U-phase winding, the second wire extends into the second clamping groove from the second side and is connected with the outgoing wire end of the W-phase winding, and the third wire extends into the third clamping groove from the second side and is connected with the outgoing wire end of the V-phase winding. A first clamping buckle, a second clamping buckle, and a third clamping buckle are arranged in the first clamping groove, the second clamping groove, and the third clamping groove respectively, the first clamping buckle is buckled at the connection between the outgoing wire end of the U-phase winding and the first wire, the second clamping buckle is buckled at the connection between the outgoing wire end of the W-phase winding and the second wire, and the third clamping buckle is buckled at the connection between the outgoing wire end of the V-phase winding and the third wire. An end cover comprises a cover body and a first covering part, a second covering part, and a third covering part connected to the periphery of the cover body, the cover body covers the first side, the first covering part covers the first clamping groove to limit the movement of the first clamping buckle in the radial direction of the first clamping groove, the second covering part covers the second clamping groove to limit the movement of the second clamping buckle in the radial direction of the second clamping groove, and the third covering part covers the third clamping groove to limit the movement of the third clamping buckle in the radial direction of the third clamping groove.

2. The stator device of the internal rotor motor according to claim 1, wherein a first limiting groove is formed in the middle of the first clamping groove, and the first clamping buckle is embedded in the first limiting groove to limit the movement of the first clamping buckle in the axial direction of the first clamping groove.

3. The stator device of the internal rotor motor according to claim 1, wherein a second limiting groove is formed in the middle of the second clamping groove, and the second clamping buckle is embedded in the second limiting groove to limit the movement of the second clamping buckle in the axial direction of the second clamping groove.

4. The stator device of the internal rotor motor according to claim 1, wherein a third limiting groove is formed in the middle of the third clamping groove, and the third clamping buckle is embedded in the third limiting groove to limit the movement of the third clamping buckle in the axial direction of the second clamping groove. ​ ​ ​ ​ 5. A stator arrangement for an internal rotor electric machine according to any one of claims 1 to 4, characterized in that The stator device of the inner rotor motor further comprises a stator core, the bobbin comprises a ring-shaped main body, a first fixing part, a second fixing part and a third fixing part, the stator core is arranged on the outer side circumferential surface of the main body, the winding assembly is arranged on the inner side circumferential surface of the main body, the main body is used for penetrating the rotor device and has the first side and the second side away from each other in the axial direction, one end of the first fixing part is connected with the first side circumferential edge of the main body, the other end of the first fixing part extends towards the second side, the first clamping groove is arranged on the first fixing part, one end of the second fixing part is connected with the first side circumferential edge of the main body, the other end of the second fixing part extends towards the second side, the second clamping groove is arranged on the second fixing part, one end of the third fixing part is connected with the first side circumferential edge of the main body, the other end of the third fixing part extends towards the second side, and the third clamping groove is arranged on the third fixing part.

6. A stator arrangement for an internal rotor electric machine according to claim 5, characterized in that The two sides of any one of the first covering part, the second covering part and the third covering part are provided with limiting protrusions in the length extension direction, and the two sides of any one of the first fixing part, the second fixing part and the third fixing part are provided with limiting sliding grooves matched with the limiting protrusions, and the limiting protrusions can be slidably connected into the limiting sliding grooves.

7. A stator arrangement for an internal rotor electric machine according to claim 5, characterized in that The two sides of any one of the first covering part, the second covering part and the third covering part are provided with limiting sliding grooves in the length extension direction, and the two sides of any one of the first fixing part, the second fixing part and the third fixing part are provided with limiting protrusions matched with the limiting sliding grooves, and the limiting protrusions can be slidably connected into the limiting sliding grooves.

8. A stator arrangement for an internal rotor electric machine according to claim 5, characterized in that The bobbin further comprises six winding parts arranged at intervals on the inner side circumferential surface of the main body, the winding assembly comprises six coils wound on the six winding parts respectively, the bobbin further comprises a plurality of limiting parts arranged at intervals on the first side of the main body in the circumferential direction of the main body, an outlet is formed between two adjacent limiting parts, the outlet ends of the plurality of coils pass through the limiting parts to form the outlet ends of the U-phase winding, the outlet ends of the W-phase winding and the outlet ends of the V-phase winding, and the cover body is arranged on the limiting parts and is threadedly connected with the limiting parts.

9. A stator arrangement for an internal rotor electric machine according to claim 8, characterized in that The outlet ends of the U-phase winding, the outlet ends of the W-phase winding and the outlet ends of the V-phase winding are respectively sleeved with insulating tubes.

10. An internal rotor electric machine characterized by The inner rotor motor comprises a rotor device and a stator device as claimed in any one of claims 1 to 9.

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