A stator block type outer rotor motor

Abstract

The present invention relates to the technical field of motors, and in particular to a stator block type outer rotor motor, comprising a rotor and a stator, wherein the stator comprises a stator seat, a plurality of stator blocks detachably connected to the stator seat, and a flat wire winding wound on the stator blocks, wherein the flat wire winding is wound on the stator blocks in a flat wire vertical winding manner. The present invention provides a stator block type outer rotor motor, which solves the technical problems of reduced filling factor and high cost of coil windings in traditional motors.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a stator block type outer rotor motor. Background Art

[0002] At present, with the rapid development of the low-altitude economy, the application scenarios of direct-drive external rotor drive motors in the aviation field are becoming more and more extensive, and the demand is growing. The constraints on its development are mainly concentrated on improving the performance of the motor, improving the processing accuracy and reducing the manufacturing cost. However, the current development at home and abroad is relatively mature. Most drive motors still use the technology of laminating a whole piece of silicon steel sheets and then forming it into one piece. It is suitable for small and medium-sized motors. The processability of large motors using the technology of laminating a whole piece of silicon steel sheets is poor, and the economic efficiency is poor. Therefore, the block-type stator core came into being.

[0003] The block-type stator core divides the ordinary stator core into several stator blocks of equal size. Each stator block is embedded in the stator seat and axially fixed by the upper and lower end plates. This method has high processing feasibility and can wind the copper wire winding of a single stator block, greatly reducing the processing and production costs.

[0004] Motor windings can be divided into round wire windings and flat wire windings according to the type of copper wire. At present, the development of round wire winding technology at home and abroad is very mature. Round wire winding motors use traditional round cross-section wires to construct the coils of the motor. When current passes through these coils, the magnetic field generated causes the motor rotor to rotate. Due to its simple structure, round wire winding motors usually have high efficiency and reliability. Due to its simple and reliable structure, round wire winding motors are widely used in various general occasions, such as home appliances, power tools, etc. Its advantages are simple structure, easy manufacturing, low cost and convenient maintenance. Its advantages are simple manufacturing, small linear error, and easy control of the spatial distribution and magnetic field distribution of the motor. At the same time, the gap between the round wires is small, the connection between the coils is good, and the anti-interference performance is strong. However, due to the small spacing between the round wires, the effective filling factor is reduced, resulting in low energy utilization of the motor. Due to the small coil spacing, the round wire winding has high tolerance requirements for the actual winding and magnetic circuit, high processing difficulty, and a large total length of copper wire required, resulting in high cost.

[0005] Flat wire winding technology has developed rapidly in recent years with the development of permanent magnet synchronous motor technology for new energy vehicles. Flat wire winding motors use flat-shaped wires (also called rectangular or flat wires) to construct coils. This design allows the coils to be arranged more closely, increasing the power density of the motor. When current passes through these coils, the magnetic field generated causes the motor rotor to rotate. Due to the high power density and efficiency, it is particularly suitable for applications that require high performance, such as electric vehicles, drones, high-speed machine tools, etc. In addition, the distance between coils in the flat wire winding structure is large, resulting in lower leakage induction and low voltage distortion.

[0006] Flat wire windings can be divided into hairpin windings, flat windings, and vertical windings according to the winding form.

[0007] Currently, flat wire motors all use hairpin windings and flat windings for flat wire winding. This winding method is relatively complicated. It can only use equipment to form each turn of copper wire and then weld the entire winding. It is impossible to form each block of the core winding at a time. It is also costly and not conducive to later maintenance. Summary of the invention

[0008] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a stator block type outer rotor motor, which solves the technical problems of reduced filling factor and high cost of coil windings in traditional motors.

[0009] The present invention provides a stator block type outer rotor motor, comprising a rotor and a stator, wherein the stator comprises a stator seat, a plurality of stator blocks detachably connected to the stator seat, and a flat wire winding wound on the stator blocks, wherein the flat wire winding is wound on the stator blocks in a flat wire vertical winding manner.

[0010] A further improvement of the stator block type outer rotor motor of the present invention is that a plurality of slots are spaced apart on the side walls of the stator seat, bosses are provided at positions of the stator block corresponding to the slots, a second through hole extending in the axial direction is provided on the bosses, stator end blocks are provided on the top and bottom surfaces of the stator block, the sides of the stator end blocks away from the stator block are in an arc shape, the flat wire winding is wound on the stator end blocks, and the bosses can be inserted into the slots.

[0011] A further improvement of the stator block type outer rotor motor of the present invention is that the slot is a dovetail slot and the boss is a dovetail boss; The stator seat protrudes outward from the side surface of the rotor to form a limit platform, and the stator block abuts against the limit platform; A first threaded hole is formed on the side of the stator seat close to the rotor. A limiting ring is arranged on the stator seat. A first through hole is formed on the limiting ring at a position corresponding to the first threaded hole. The first through hole and the first threaded hole are connected by a first bolt.

[0012] A further improvement of the stator block type external rotor motor of the present invention is that the stator block includes a head, a winding part and a tail, the head, the winding part and the tail are connected in an I-shape, the heads of two adjacent stator blocks are spliced ​​and connected, the head, the winding part and the tail are surrounded to form a U-shaped wire groove, insulating paper is arranged in the U-shaped wire groove, and the flat wire winding is wound around the winding part and adhered to the insulating paper.

[0013] A further improvement of the stator block type outer rotor motor of the present invention is that a head arc platform is formed at one end of the head and a head arc groove is formed at the other end.

[0014] A further improvement of the stator block type outer rotor motor of the present invention is that the plurality of flat wire windings are connected by U-phase copper bars, V-phase copper bars and W-phase copper bars, and the U-phase copper bars, V-phase copper bars and W-phase copper bars are located on the same side of the stator seat.

[0015] A further improvement of the stator block type outer rotor motor of the present invention is that the rotor includes a motor shaft, a motor upper cover and a rotor housing, the stator also includes a motor lower cover, the stator seat is connected to the motor lower cover, sleeves are arranged around the outer sides of several of the stator blocks, the sleeves correspond to the inner side walls of the rotor housing, magnetic steels are arranged at intervals on the inner side walls of the rotor housing, the motor shaft is connected to a ball bearing, and the ball bearing is connected to the stator seat.

[0016] A further improvement of the stator block type outer rotor motor of the present invention is that a connecting column is arranged near the position of the stator seat near the motor lower cover, the connecting column is provided with a second threaded hole, and the motor lower cover is provided with a third threaded hole, and a second bolt is screwed into the corresponding second threaded hole and the third threaded hole to fix the motor lower cover and the stator seat.

[0017] A further improvement of the stator block type outer rotor motor of the present invention is that the sleeve is made of carbon fiber material.

[0018] A further improvement of the stator block type outer rotor motor of the present invention is that a magnetic block is arranged at a position of the motor lower cover corresponding to the motor shaft, and a magnetic encoder is arranged at a position of the motor lower cover corresponding to the magnetic block.

[0019] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: 1) The use of stator blocks and flat wire vertical winding can not only greatly improve the economy of the motor, reduce manufacturing and maintenance costs, but also facilitate large-scale production through special equipment in the later stage.

[0020] 2) The flat wire winding in vertical winding form can be wound in one time, reducing production costs and optimizing production processes.

[0021] 3) Due to the vertical winding form, the winding is in a waist-shaped circle, which can effectively transfer heat and improve heat dissipation efficiency.

[0022] 4) The gap between the stator block and the flat wire winding is fixed by the stator end block, which effectively improves the overall vibration resistance of the motor.

[0023] 5) The structure of the stator blocks reduces the overall weight of the core and improves the torque density and power density of the motor.

[0024] 6) The stator blocks and flat wire windings allow for large gaps in the motor windings, allowing for direct cooling with a centrifugal fan to improve heat dissipation performance.

[0025] 7) The flat wire windings are connected through the copper busbar of the surrounding star-shaped long span line, which can effectively reduce the end height and thus reduce the overall volume of the motor. Moreover, since it is located between the flat wire winding and the heat sink, it can effectively improve the overall heat dissipation efficiency of the motor.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is an exploded schematic diagram of a stator block type outer rotor motor provided by the present invention.

[0029] Figure 2 It is a schematic diagram of a stator block type outer rotor motor provided by the present invention.

[0030] Figure 3 yes Figure 2 Schematic diagram of CC in the middle.

[0031] Figure 4 It is a schematic diagram of a stator in a stator block type outer rotor motor provided by the present invention.

[0032] Figure 5 The present invention provides a schematic diagram of a stator seat and a stator block in a stator block type outer rotor motor.

[0033] Figure 6 It is a schematic diagram of a flat wire winding in a stator block type outer rotor motor provided by the present invention.

[0034] Figure 7 The present invention provides a schematic diagram of a stator block and a flat wire winding in a stator block type outer rotor motor.

[0035] Figure 8 yes Figure 7 Enlarged schematic diagram of part A.

[0036] Fig. 9 It is a schematic diagram of a stator seat in a stator block type outer rotor motor provided by the present invention.

[0037] Reference numerals: 11. Motor cover; 12. Rotor housing; 13. Motor shaft; 14. Positioning pin; 15. Deep groove ball bearing; 16. Double row angular contact ball bearing; 17. Magnetic steel; 21. Motor lower cover; 22. Stator seat; 23. Stator block; 24. Flat wire winding; 25. Sleeve; 26. Limiting ring; 27. Insulating paper; 28. Second through hole; 29. ​​Stator end block; 241. U-phase copper bar; 242. V-phase copper bar; 243. W-phase copper bar; 221. Connecting column; 222. Limiting platform; 223. Slot; 31. Magnetic block; 32. Magnetic encoder; 33. Three-phase line. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0039] Combine the following Figures 1 to 3 The present invention describes a stator block type outer rotor motor, including a rotor and a stator, wherein the stator includes a stator base 22, a plurality of stator blocks 23 detachably connected to the stator base 22, and a flat wire winding 24 wound on the stator blocks 23, wherein the flat wire winding 24 is wound on the stator blocks 23 in a flat wire vertical winding manner.

[0040] In a preferred embodiment of the stator block type outer rotor motor of the present invention, a plurality of slots 223 are spaced apart on the side walls of the stator seat 22, bosses are provided at positions of the stator block 23 corresponding to the slots 223, the bosses are provided with second through holes 28 extending in the axial direction, stator end blocks 29 are provided on the top and bottom surfaces of the stator block 23, the side surfaces of the stator end blocks 29 away from the stator block 23 are in an arc shape, the flat wire winding 24 is wound around the stator end blocks 29, and the bosses can be inserted into the slots 223.

[0041] Furthermore, if Figure 4 , Figure 7 , Figure 8 and Fig. 9As shown, the slot 223 is a dovetail slot, and the boss is a dovetail boss, which is inserted into the dovetail slot to stably connect the stator seat 22 and the electronic block to prevent the stator block 23 from radially separating from the stator seat 22.

[0042] Furthermore, if Figure 7 , Figure 8 and Fig. 9 As shown, the side of the stator seat 22 away from the rotor protrudes outward to form a limit platform 222, and the stator block 23 abuts against the limit platform 222 to prevent the stator block 23 from slipping off the stator seat 22 from the bottom.

[0043] Furthermore, if Figure 4 , Figure 7 , Figure 8 and Fig. 9 As shown, a first threaded hole is provided on the side of the stator seat 22 close to the rotor, a limiting ring 26 is provided on the stator seat 22, a first through hole is provided at a position corresponding to the first threaded hole of the limiting ring 26, the first through hole and the first threaded hole are connected by a first bolt, and the limiting ring 26 is provided to limit the top end of the stator block 23, thereby preventing the stator block 23 from slipping off the stator seat 22 from the top end, thereby improving the connection stability of the stator block 23 and the stator seat 22.

[0044] Furthermore, if Figure 5 and Figure 6 As shown, the stator block 23 includes a head, a winding part and a tail, the head, the winding part and the tail are connected in an I-shape, the heads of two adjacent stator blocks 23 are spliced ​​and connected, the head, the winding part and the tail are surrounded to form a U-shaped wire groove, and insulating paper 27 is arranged in the U-shaped wire groove, the flat wire winding 24 is wound around the winding part and adhered to the insulating paper 27, a dovetail boss is formed at the head, and a second through hole 28 is opened at the position of the dovetail boss and the head, and the weight of the stator can be reduced by opening the second through hole 28, thereby reducing the cost of the outer rotor motor.

[0045] Preferably, if Figure 2 and Figure 6 As shown, the two connection terminals of the flat wire winding 24 are both located close to the rotor, and a plurality of the flat wire windings 24 are connected by a U-phase copper bar 241, a V-phase copper bar 242 and a W-phase copper bar 243. The U-phase copper bar 241, the V-phase copper bar 242 and the W-phase copper bar 243 are located on the same side of the stator seat 22, and the U-phase copper bar 241, the V-phase copper bar 242 and the W-phase copper bar 243 are arranged in a surrounding star-shaped long span line form.

[0046] Furthermore, if Figure 6As shown, a head arc platform is formed at one end of the head and a head arc groove is formed at the other end. The head arc platforms and head arc grooves of two adjacent stator blocks 23 are spliced ​​and connected to improve the connection stability of the two adjacent stator blocks 23.

[0047] Furthermore, if Figure 1 , Figure 2 and Figure 3 As shown, the rotor includes a motor shaft 13, a motor upper cover 11 and a rotor housing 12, the stator also includes a motor lower cover 21, the stator seat 22 is connected to the motor lower cover 21, a sleeve 25 is arranged around the outer side of a plurality of the stator blocks 23, the sleeve 25 corresponds to the inner side wall of the rotor housing 12, the inner side wall of the rotor housing 12 is spaced apart with magnetic steel 17, the motor shaft 13 is connected to a ball bearing, and the ball bearing is connected to the stator seat 22.

[0048] Preferably, there are two ball bearings, namely a deep groove ball bearing 15 and a double row angular contact ball bearing 16 .

[0049] Preferably, a positioning pin 14 is provided at the top end of the motor shaft 13 , and when the external blade is connected to the motor shaft 13 , the positioning is performed by the positioning pin 14 .

[0050] Preferably, the sleeve 25 is made of carbon fiber and is sleeved on the stator block 23 to fill the gap between the stator block 23 and the rotor housing 12 and to form a radial constraint on the stator block 23, thereby improving the stability of the overall structure of the outer rotor motor.

[0051] Furthermore, if Figure 3 and Fig. 9 As shown, a connecting column 221 is provided at a position of the stator seat 22 near the motor lower cover 21, the connecting column 221 is provided with a second threaded hole, and the motor lower cover 21 is provided with a third threaded hole, and a second bolt is screwed into the corresponding second threaded hole and the third threaded hole to fix the motor lower cover 21 and the stator seat 22.

[0052] Furthermore, if Figure 1 and Figure 3 As shown, a magnetic block 31 is disposed at a position of the motor lower cover 21 corresponding to the motor shaft 13 , a magnetic encoder 32 is disposed at a position of the motor lower cover 21 corresponding to the magnetic block 31 , and a three-phase line 33 is disposed at the motor lower cover 21 .

[0053] In a specific implementation case, an insulating paper 27 is provided at the U-shaped wire slot of the stator block 23, a stator end block 29 is provided at both ends of the stator block 23, and the flat wire winding 24 is wound on the stator block 23 by a flat wire vertical winding method; Connect the dovetail boss of the stator block 23 to the dovetail groove of the stator seat 22, fit the limiting ring 26 to the side of the stator seat 22 close to the rotor, connect the first through hole and the first threaded hole by a first bolt; connect the sleeve 25 to the outer side of the stator block 23; The limiting column of the stator seat 22 is connected to the motor lower cover 21 through a second bolt, and the motor lower cover 21 is connected to the magnetic encoder 32 and the three-phase line 33; The terminals of the plurality of flat wire windings 24 are connected using a U-phase copper bar 241, a V-phase copper bar 242 and a W-phase copper bar 243; The motor shaft 13 is connected to the motor upper cover 11 , the rotor housing 12 is connected to the outer side of the sleeve 25 , the motor upper cover 11 is connected to the rotor housing 12 , and the motor shaft 13 is inserted into the stator seat 22 to assemble the outer rotor motor.

[0054] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: 1) The use of stator blocks 23 and flat wire vertical winding can not only greatly improve the economy of the motor, reduce manufacturing and maintenance costs, but also facilitate large-scale production through special equipment in the later stage.

[0055] 2) The flat wire winding 24 in the vertical winding form can be wound and formed in one time, thereby reducing production costs and optimizing production processes.

[0056] 3) Due to the vertical winding form, the winding is in a waist-shaped circle, which can effectively transfer heat and improve heat dissipation efficiency.

[0057] 4) The gap between the stator block 23 and the flat wire winding 24 is fixed by the stator end block 29, which effectively improves the overall anti-vibration performance of the motor.

[0058] 5) The structure of the stator block 23 reduces the overall weight of the core and improves the torque density and power density of the motor.

[0059] 6) The form of the stator block 23 and the flat wire winding 24 makes the gap between the motor windings large, and a centrifugal fan can be used for direct cooling and heat dissipation, thereby improving the heat dissipation performance.

[0060] 7) The flat wire windings 24 are connected by a copper busbar with a surrounding star-shaped long span line, which can effectively reduce the end height and thus reduce the overall volume of the motor. Moreover, since it is located between the flat wire windings 24 and the heat sink, the overall heat dissipation efficiency of the motor can be effectively improved.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stator block type outer rotor motor, characterized in that: It comprises a rotor and a stator. The stator comprises a stator seat, a plurality of stator blocks detachably connected to the stator seat, and a flat wire winding wound on the stator blocks. The flat wire winding is wound on the stator blocks in a flat wire vertical winding manner.

2. The stator block type outer rotor motor according to claim 1, characterized in that: The side walls of the stator seat are provided with a plurality of slots at intervals, the stator block is provided with bosses at positions corresponding to the slots, the bosses are provided with second through holes extending in the axial direction, the top and bottom surfaces of the stator block are provided with stator end blocks, the sides of the stator end blocks away from the stator block are in an arc shape, the flat wire winding is wound around the stator end blocks, and the bosses can be inserted into the slots.

3. The stator block type outer rotor motor according to claim 2, characterized in that: The slot is a dovetail slot, and the boss is a dovetail boss; The stator seat protrudes outward from the side surface of the rotor to form a limit platform, and the stator block abuts against the limit platform; A first threaded hole is formed on the side of the stator seat close to the rotor. A limiting ring is arranged on the stator seat. A first through hole is formed on the limiting ring at a position corresponding to the first threaded hole. The first through hole and the first threaded hole are connected by a first bolt.

4. The stator block type outer rotor motor according to claim 1, characterized in that: The stator block includes a head, a winding part and a tail, the head, the winding part and the tail are connected in an I-shape, the heads of two adjacent stator blocks are spliced ​​and connected, the head, the winding part and the tail are surrounded to form a U-shaped wire groove, insulating paper is arranged in the U-shaped wire groove, and the flat wire winding is wound around the winding part and adhered to the insulating paper.

5. The stator block type outer rotor motor according to claim 4, characterized in that: A head arc platform is formed at one end of the head, and a head arc groove is formed at the other end.

6. The stator block type outer rotor motor according to claim 1, characterized in that: The plurality of flat wire windings are connected through a U-phase copper bar, a V-phase copper bar and a W-phase copper bar, and the U-phase copper bar, the V-phase copper bar and the W-phase copper bar are located on the same side of the stator seat.

7. The stator block type outer rotor motor according to claim 1, characterized in that: The rotor includes a motor shaft, a motor upper cover and a rotor housing, the stator also includes a motor lower cover, the stator seat is connected to the motor lower cover, a sleeve is arranged around the outer side of a plurality of the stator blocks, the sleeve corresponds to the inner side wall of the rotor housing, magnetic steel is arranged at intervals on the inner side wall of the rotor housing, the motor shaft is connected to a ball bearing, and the ball bearing is connected to the stator seat.

8. The stator block type outer rotor motor according to claim 7, characterized in that: A connecting column is provided at a position of the stator seat near the motor lower cover, the connecting column is provided with a second threaded hole, and the motor lower cover is provided with a third threaded hole. A second bolt is screwed into the corresponding second threaded hole and the third threaded hole to fix the motor lower cover and the stator seat.

9. The stator block type outer rotor motor according to claim 7, characterized in that: The sleeve is made of carbon fiber.

10. The stator block type outer rotor motor according to claim 7, characterized in that: A magnetic block is arranged at a position of the motor lower cover corresponding to the motor shaft, and a magnetic encoder is arranged at a position of the motor lower cover corresponding to the magnetic block.

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