Disc-type multi-layer outer rotor motor

Abstract

The present invention relates to the technical field of disc-type outer-rotor motors, and more particularly to a disc-type multi-layer outer-rotor motor, which includes a fixed shaft, an outer-rotor assembly and an inner-stator assembly. The outer-rotor assembly is rotatably mounted on the fixed shaft, and the inner-stator assembly is fixedly mounted on the fixed shaft. The inner-stator assembly is located between the outer-rotor assembly and the fixed shaft. A multi-layer disc unit is formed between the outer-rotor assembly and the inner-stator assembly, and the multi-layer disc units are arranged in sequence along the axial direction of the fixed shaft. A heat dissipation mechanism is provided on the inner-stator assembly. When the disc-type multi-layer outer-rotor motor of the present invention is in use, by arranging multi-layer disc units on the fixed shaft, the load of the outer-rotor motor can be increased, and sufficient torque and power can be provided to drive the load. At the same time, in cooperation with the heat dissipation mechanism provided on the inner-stator assembly for heat dissipation, the heat generated inside can be dissipated in time, ensuring the efficiency, performance and service life of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of disc outer-rotor motors, and more particularly to a disc multi-layer outer-rotor motor. Background Art

[0002] Due to the performance advantages of disc outer-rotor motors such as high power density, compact structure, high efficiency, and low moment of inertia, disc outer-rotor motors are widely used in fields such as electric vehicles, aerospace, wind power generation, and robotics. However, disc motors may not be suitable for large-load applications, such as large mechanical equipment and large power equipment. In the case of large loads, disc motors may experience problems such as unstable speed and low output power, which affect the normal operation of the equipment. The limited adaptability of existing disc outer-rotor motors to loads is mainly due to the combined effects of various factors such as their structural limitations, heat dissipation problems, materials, technical limitations, dynamic performance, and cost considerations. As a result, when dealing with large loads, the motor may not be able to provide sufficient torque and power to drive the load. At the same time, under large-load conditions, the heat generated inside the motor may not be dissipated in time, resulting in overheating of the motor. Overheating not only reduces the efficiency of the motor but may also have a negative impact on the performance and lifespan of the motor. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to solve the problem that existing disc outer-rotor motors cannot provide sufficient torque and power to drive the load under large loads and the heat generated inside cannot be dissipated in time, resulting in overheating of the motor. Overheating not only reduces the efficiency of the motor but may also have a negative impact on the performance and lifespan of the motor. Now, a disc multi-layer outer-rotor motor is provided.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a disc multi-layer outer-rotor motor, including a fixed shaft, and further including an outer-rotor assembly and an inner-stator assembly. The outer-rotor assembly is rotatably mounted on the fixed shaft, the inner-stator assembly is fixedly mounted on the fixed shaft, the inner-stator assembly is located between the outer-rotor assembly and the fixed shaft, a multi-layer disc unit is formed between the outer-rotor assembly and the inner-stator assembly, and multiple layers of the disc units are arranged in sequence along the axial direction of the fixed shaft. A heat dissipation mechanism is provided on the inner-stator assembly;

[0005] In each of the disc units, the outer rotor assembly includes a rotor drum. The rotor drum includes a first body with an annular structure. On the outer peripheries at both ends of the first body, there are convex flanges protruding outward. The convex flanges at both ends of the first body are arranged along the axial direction of the fixed shaft and form inwardly recessed placement grooves with the first body. On the end faces at both axial ends of the first body along the fixed shaft, there are a number of permanent magnets. The number of permanent magnets is arranged in the placement grooves and distributed along the circumference of the first body. In each of the disc units, the inner stator assembly includes a stator core. The stator core includes two second bodies with annular structures. The two second bodies are respectively arranged in the placement grooves at both ends on the first body. On both of the second bodies, there are coil assemblies opposite to the permanent magnets. The coil assemblies in multiple disc units are connected in parallel with each other. Compared with the prior art, in this solution, multiple disc units are arranged on the fixed shaft, which can not only increase the load of the outer rotor motor, but also provide sufficient torque and power to drive the load. At the same time, it cooperates with the heat dissipation mechanism arranged on the inner stator assembly for heat dissipation, and can also dissipate the heat generated inside in time to ensure the efficiency, performance and service life of the motor.

[0006] In order to fix the second body on the fixed shaft, in some preferred embodiments, the inner stator assembly further includes two stator mounting plates. The two stator mounting plates are arranged corresponding to the two second bodies. The second body is fixed on the corresponding stator mounting plate. The second body is located between the stator mounting plate and the permanent magnet. The stator mounting plate is arranged in the placement groove and has a gap. The stator mounting plates on multiple disc units are all mounted on the fixed shaft. Fix the corresponding second body on the stator mounting plate, and then fix the stator mounting plates on multiple disc units on the fixed shaft to realize fixing the stator core on the fixed shaft.

[0007] In order to realize the parallel connection between the coil assemblies on multiple disc units, in some preferred embodiments, on each of the disc units, there is a terminal block fixed on the stator mounting plate. The terminal block located on one of the two stator mounting plates is a connection male head, and the terminal block located on the other of the two stator mounting plates is a connection female head. The coil assembly is correspondingly connected to the terminal block. The connection female head of the terminal block on the previous layer of disc unit and the connection male head of the terminal block on the next layer of disc unit are butted against each other between adjacent two layers of disc units. By setting the connection male head of the terminal block on one of the two stator mounting plates of each layer, and setting the connection female head of the terminal block on the other stator mounting plate, and connecting the coil assemblies on each layer of disc unit in parallel to the corresponding terminal block, and butting the connection male head and the connection female head of the corresponding terminal blocks between adjacent two layers of disc units, the coil assemblies between multiple disc units are connected in parallel with each other.

[0008] To implement a heat dissipation mechanism, in some preferred embodiments, the heat dissipation mechanism includes cooling water pipes disposed on two stator cores in each layer of the disk unit. One end of the cooling water pipe is an input port, and the other end of the cooling water pipe is an output port. An input channel for cooling medium input and an output channel for cooling medium output are provided on the fixed shaft. The input ports of the cooling water pipes on each layer of the disk unit are communicated with the input channel, and the output ports of the cooling water pipes on each layer of the disk unit are communicated with the output channel. By providing cooling water pipes on two stator cores in each layer of the disk unit, and the input ports of the cooling water pipes on multiple layers of the disk unit are all communicated with the input channel on the fixed shaft, and the output ports of the cooling water pipes on multiple layers of the disk unit are all communicated with the output channel on the fixed shaft. By inputting a cooling medium into the input channel on the fixed shaft and inputting it through the input ports of the cooling water pipes on each layer of the disk unit, the cooling medium exchanges heat with the stator core, and discharges the medium with heat through the output ports of the cooling water pipes to the output channel on the fixed shaft for discharge, thereby realizing the heat dissipation of the inner stator assembly.

[0009] To ensure the stable and reliable operation of the disk unit, in some preferred embodiments, the coil assembly is disposed at one end of the stator core close to the magnet, and the cooling water pipe is disposed at one end of the stator core far from the magnet. Placing the coil assembly at one end of the stator core close to the magnet and the cooling water pipe at one end of the stator core far from the magnet, that is, it can be understood that the coil assembly and the cooling water pipe are respectively disposed at both ends of the stator core, which can not only ensure the stable and reliable operation of the disk unit, but also ensure the stable and reliable heat dissipation of the disk unit.

[0010] To improve the heat dissipation efficiency of the stator core, in some preferred embodiments, the cooling water pipe is arranged in a zigzag manner along the circumferential direction of the stator core. By arranging the cooling water pipe on the stator core in a zigzag manner, the contact surface between the stator core and the cooling water pipe is increased, that is, the flow path of the cooling medium in the cooling water pipe and on the stator core is increased, which better ensures the heat exchange between the cooling medium in the cooling water pipe and the stator core, and thus improves the heat dissipation efficiency of the stator core.

[0011] In some preferred embodiments, the outer rotor assembly further includes an outer steel cylinder, and the rotor drum in each layer of the disk unit is fixedly connected to the outer steel cylinder.

[0012] In some preferred embodiments, the rotor drum in each layer of the disk unit is fixedly connected to the outer steel cylinder by key connection. A long groove is provided on the inner peripheral wall of the outer steel cylinder along its axial direction. A first key groove is provided on the outer peripheral wall of the rotor drum in each layer of the disk unit. The first key groove in each layer of the disk unit and the long groove are correspondingly arranged, and a key is provided between the first key groove and the long groove in each layer of the disk unit.

[0013] Preferably, in some embodiments, end caps are fixedly installed at both ends of the outer steel cylinder. The end caps at both ends of the outer steel cylinder are rotatably installed on the fixed shaft, and a cavity is formed between the fixed shaft, the outer steel cylinder and the end caps at both ends.

[0014] Preferably, in some embodiments, fixed seats are fixedly connected to both ends of the fixed shaft. The outer rotor assembly and the inner stator assembly are located between the fixed seats at both ends, and the fixed seats are used to fix the fixed shaft.

[0015] The beneficial effects of the present invention are as follows: When the disc-type multi-layer outer rotor motor of the present invention is in use, multiple disc-type units are arranged on the fixed shaft, which can not only improve the load of the outer rotor motor, but also provide sufficient torque and power to drive the load. At the same time, it is combined with the heat dissipation mechanism arranged on the inner stator assembly for heat dissipation, and can also dissipate the heat generated inside in time, ensuring the efficiency, performance and service life of the motor, and avoiding the problems that the existing disc-type outer rotor motor cannot provide sufficient torque and power to drive the load under large loads and the heat generated inside may not be dissipated in time, resulting in overheating of the motor. Overheating will not only reduce the efficiency of the motor, but may also have a negative impact on the performance and service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the drawings and embodiments.

[0017] Figure 1 is the three-dimensional structure diagram of the present invention;

[0018] Figure 2 is the front view of the present invention;

[0019] Figure 3 is the left view of the present invention;

[0020] Figure 4 is the top view of the present invention;

[0021] Figure 5 is Figure 3 the sectional view taken along A-A in;

[0022] Figure 6 is Figure 5 the partial enlarged view of B in;

[0023] Figure 7 is the three-dimensional structure diagram of the installation structure between the rotor steel cylinder, the inner stator assembly and the fixed shaft in the present invention;

[0024] Figure 8 is the front view of the installation structure between the rotor steel cylinder, the inner stator assembly and the fixed shaft in the present invention;

[0025] Figure 9It is the left view of the installation structure among the rotor steel cylinder, the inner stator assembly and the fixed shaft in the present invention;

[0026] Figure 10 It is the right view of the installation structure among the rotor steel cylinder, the inner stator assembly and the fixed shaft in the present invention;

[0027] Figure 11 It is Figure 8 the C-C sectional view in;

[0028] Figure 12 It is Figure 11 the partial enlarged view of D in;

[0029] Figure 13 It is the three-dimensional structure diagram of the outer rotor assembly in the present invention;

[0030] Figure 14 It is the front view of the outer rotor assembly in the present invention;

[0031] Figure 15 It is Figure 14 the E-E sectional view in;

[0032] Figure 16 It is the three-dimensional structure diagram of the inner stator assembly in the present invention;

[0033] Figure 17 It is the front view of the inner stator assembly in the present invention;

[0034] Figure 18 It is the left view of the inner stator assembly in the present invention;

[0035] Figure 19 It is Figure 18 the F-F sectional view in;

[0036] Figure 20 It is Figure 19 the enlarged view of G in;

[0037] Figure 21 It is the three-dimensional structure diagram of the single-layer disc unit in the present invention;

[0038] Figure 22 It is the front view of the single-layer disc unit in the present invention;

[0039] Figure 23 It is the left view of the single-layer disc unit in the present invention;

[0040] Figure 24 It is the right view of the single-layer disc unit in the present invention;

[0041] Figure 25 It is Figure 23 the G-G sectional view in;

[0042] Figure 26 It is a three-dimensional structural schematic diagram of the stator core on one side of the disc unit in the present invention;

[0043] Figure 27 It is the front view of the stator core on one side of the disc unit in the present invention;

[0044] Figure 28 It is the left view of the stator core on one side of the disc unit in the present invention;

[0045] Figure 29 It is Figure 27 The sectional view taken along H-H in

[0046] Figure 30 It is Figure 28 The sectional view taken along I-I in

[0047] Figure 31 It is a three-dimensional structural schematic diagram between the rotor drum and the magnetic steel in the present invention;

[0048] Figure 32 It is the front view between the rotor drum and the magnetic steel in the present invention;

[0049] Figure 33 It is Figure 32 The sectional view taken along J-J in

[0050] In the figure: 1. Fixed shaft;

[0051] 2. Outer rotor assembly, 201. Rotor drum, 2011. First body, 2012. Flange, 2013. Placing groove, 202. Magnetic steel, 203. Outer steel cylinder, 204. End cover;

[0052] 3. Inner stator assembly, 301. Stator core 3011. Second body, 3012. Coil assembly, 3013. Stator mounting plate, 302. Terminal post, 3021. Connecting male head, 3022. Connecting female head;

[0053] 4. Heat dissipation mechanism, 401. Cooling water pipe, 402. Output channel, 403. Input channel, 404. Heat dissipation hole group;

[0054] 5. Fixed seat;

[0055] 6. Cavity body. Specific embodiments

[0056] The present invention will be further described in detail below in conjunction with embodiments:

[0057] The present invention is not limited to the following specific embodiments. Those of ordinary skill in the art can implement the present invention in other various specific embodiments according to the disclosed content of the present invention. Or, any simple changes or modifications made by adopting the design structure and concept of the present invention fall within the protection scope of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0058] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0060] As Figure 1 - 33 shown, a disc-type multi-layer outer rotor motor includes a fixed shaft 1, an outer rotor assembly 2, and an inner stator assembly 3. The outer rotor assembly 2 is rotatably mounted on the fixed shaft 1, the inner stator assembly 3 is fixedly mounted on the fixed shaft 1, the inner stator assembly 3 is located between the outer rotor assembly 2 and the fixed shaft 1, a multi-layer disc unit is formed between the outer rotor assembly 2 and the inner stator assembly 3, the multi-layer disc units are arranged in sequence along the axial direction of the fixed shaft 1, and a heat dissipation mechanism 4 is provided on the inner stator assembly 3;

[0061] In the outer rotor assembly 2 of each layer of disc unit, the outer rotor assembly 2 includes a rotor drum 201. The rotor drum 201 includes a first body 2011 with an annular structure. On the outer circumferences at both ends of the first body 2011, there are both outwardly protruding flanges 2012. The flanges 2012 at both ends of the first body 2011 are arranged along the axial direction of the fixed shaft 1. Between the flanges 2012 at both ends of the first body 2011 and the first body 2011 respectively, there are formed inwardly recessed placement grooves 2013, that is, there are two inwardly recessed placement grooves 2013 opposite to each other at both ends of the first body 2011. On the end faces at both axial ends of the first body 2011 along the fixed shaft 1, there are provided a number of magnetic steels 202. The number of magnetic steels 202 is arranged in the placement grooves 2013 and is evenly distributed along the circumference of the first body 2011;

[0062] In the inner stator assembly 3 of each layer of disc unit, the inner stator assembly 3 includes a stator core 301. The stator core 301 includes two second bodies 3011 with annular structures. The two second bodies 3011 are respectively arranged in the placement grooves 2013 at both ends on the first body 2011. On both of the two second bodies 3011, there are provided coil assemblies 3012 opposite to the magnetic steels 202. The coil assemblies 3012 in multiple layers of disc units are connected in parallel with each other.

[0063] The inner stator assembly 3 further includes two stator mounting plates 3013. The two stator mounting plates 3013 are arranged corresponding to the two second bodies 3011. The second body 3011 is fixed on the corresponding stator mounting plate 3013. The two stator mounting plates 3013 are fixedly connected to each other by welding. Welding together is also to ensure the stable and reliable operation of the inner stator assembly 3. The second body 3011 is located between the stator mounting plate 3013 and the magnetic steel 202. The stator mounting plate 3013 is arranged in the placement groove 2013 and has a gap. The stator mounting plates 3013 on multiple layers of the disc units are all mounted on the fixed shaft 1. In this embodiment, on the two stator mounting plates 3013 of each layer of disc unit, first mounting holes are axially opened along the axial direction thereof. On one end of the fixed shaft 1, a second mounting hole is axially opened along the axial direction thereof. The first mounting hole and the second mounting hole are arranged corresponding to each other. One end of a pull rod passes through the first mounting hole on the stator mounting plate 3013 in each layer of disc unit respectively, then passes through the second mounting hole at one end of the fixed shaft 1 and is threadedly connected with a nut, so as to realize that the stator mounting plates 3013 are fixedly mounted on the fixed shaft 1 through the pull rod. At the same time, the stator mounting plate 3013 is circumferentially limited with the fixed shaft 1 through a keyway.

[0064] On each layer of disc unit, there are three terminal posts 302 fixed on the stator mounting plate 3013. Among the two stator mounting plates 3013, the three terminal posts 302 on one stator mounting plate 3013 are connection male heads 3021, and the three terminal posts 302 on the other stator mounting plate 3013 among the two stator mounting plates 3013 are connection female heads 3022. The coil assembly 3012 is correspondingly connected to the three terminal posts 302. The connection female head 3022 of the terminal post 302 on the previous layer of disc unit and the connection male head 3021 of the terminal post 302 on the next layer of disc unit are butted on adjacent layers of disc units, realizing the parallel connection of the coil assemblies 3012 between multiple layers of disc units. One end of the fixed shaft 1 is axially provided with a wire passing hole, and three cables pass through the wire passing hole and are respectively connected to the three terminal posts 302 at one end of the inner stator assembly 3.

[0065] The heat dissipation mechanism 4 includes cooling water pipes 401 arranged on two stator cores 301 in each layer of disc unit. One end of the cooling water pipe 401 is an input port, and the other end of the cooling water pipe 401 is an output port. One end of the fixed shaft 1 is axially provided with an input channel 403 and an output channel 402 respectively. The input channel 403 is used for the input of the cooling medium, and the output channel 402 is used for the output of the cooling medium. A first channel and a second channel are arranged on the stator mounting plate 3013 of each layer of disc unit. The first channels between adjacent layers of disc units are interconnected through quick-connect water pipe joints, realizing the interconnection of the first channels between multiple layers of disc units. The second channels between adjacent layers of disc units are interconnected through quick-connect water pipe joints, realizing the interconnection of the second channels between multiple layers of disc units. The input port of the cooling water pipe 401 on each layer of disc unit is communicated with the input channel 403 through the first channel, and the output port of the cooling water pipe 401 on each layer of disc unit is communicated with the output channel 402 through the second channel.

[0066] And heat dissipation hole groups 404 are arranged on the stator mounting plates 3013 on both sides in each layer of disc unit. The heat dissipation hole groups 404 are composed of multiple heat dissipation holes along the fixed shaft 1 and are arranged in a staggered manner in the same direction. The heat dissipation holes are waist-shaped. Six groups of heat dissipation hole groups 404 are evenly distributed along the circumferential direction of the stator mounting plate 3013. The heat dissipation hole groups 404 on the stator mounting plates 3013 in adjacent layers of disc units are arranged correspondingly, and the heat on one side of the disc unit can be transmitted to the other side of the disc unit through the heat dissipation hole groups 404 on the stator mounting plate 3013.

[0067] The coil assembly 3012 is arranged at one end of the stator core 301 close to the magnet 202, and the cooling water pipe 401 is arranged at one end of the stator core 301 far from the magnet 202. The cooling water pipe 401 is arranged in a winding and zigzag manner along the circumferential direction of the stator core 301.

[0068] The outer rotor assembly 2 further includes an outer steel cylinder 203. The rotor drums 201 in each layer of the disc unit are fixedly connected to the outer steel cylinder 203. The rotor drums 201 in each layer of the disc unit and the outer steel cylinder 203 are fixedly connected to each other through key connections. Long grooves are arranged along the axial direction on the inner peripheral wall of the outer steel cylinder 203. First key grooves are arranged on the outer peripheral walls of the rotor drums 201 in each layer of the disc unit. The first key grooves in each layer of the disc unit and the long grooves are arranged corresponding to each other, and keys are arranged between the first key grooves and the long grooves in each layer of the disc unit.

[0069] End caps 204 are fixedly installed at both ends of the outer steel cylinder 203. The end caps 204 at both ends of the outer steel cylinder 203 are rotatably installed on the fixed shaft 1. A cavity 6 is formed among the fixed shaft 1, the outer steel cylinder 203 and the end caps 204 at both ends. The inner stator assembly 3 is arranged in the cavity 6.

[0070] Both ends of the fixed seat 5 are fixedly connected with the fixed seat 5. The outer rotor assembly 2 and the inner stator assembly 3 are located between the fixed seats 5 at both ends. The fixed seat 5 is used to fix the fixed shaft 1, realizing the place required for fixing the disc multi-layer outer rotor motor.

[0071] When installing the above-mentioned disc multi-layer outer rotor motor, first, the fixed seat 5 is fixedly installed at the required position by screws, and then it is connected to the external cooling medium conveying equipment. In this embodiment, the cooling medium is cooling water. Of course, in addition to cooling water, other cooling media can also be used, such as coolant or cooling air, etc. Then, three cables are respectively connected to the external power supply line, and are simultaneously controlled to open and close by the external control mechanism to complete the installation;

[0072] When in use, start the motor. Three cables input three-phase electricity and are conveyed to the coil assembly 3012 through the terminal posts 302. The coil assembly 3012 generates a magnetic field, which interacts with the magnetic field of the permanent magnet 202 to generate torque, realizing the rotation of the rotor assembly. The coil assemblies 3012 between the multi-layer disc units are connected in parallel with each other through three terminal posts 302, so that the torques between the multi-layer disc units are superimposed on each other, and can provide sufficient torque and power to drive the load. The external cooling water is input into the input port of the cooling water pipe 401 through the input channel 403 on the fixed shaft 1. The cooling water winds on the stator core 301 through the cooling water pipe 401 and exchanges heat with each other, timely dissipating the heat generated by the stator core 301, and is discharged from the output port of the cooling water pipe 401 to the output channel 402.

[0073] Based on the ideal embodiments of the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A disc-type multi-layer outer rotor motor, comprising a fixed shaft (1), characterized in that: It also comprises an outer rotor assembly (2) and an inner stator assembly (3), wherein the outer rotor assembly (2) is rotatably mounted on the fixed shaft (1), and the inner stator assembly (3) is fixedly mounted on the fixed shaft (1), and the inner stator assembly (3) is located between the outer rotor assembly (2) and the fixed shaft (1), and a plurality of disc-type units are formed between the outer rotor assembly (2) and the inner stator assembly (3), and the plurality of disc-type units are sequentially arranged along the axial direction of the fixed shaft (1), and a heat dissipation mechanism (4) is arranged on the inner stator assembly (3); The outer rotor assembly (2) in each layer of the disk-type unit comprises a rotor roller (201), the rotor roller (201) comprising a first body (2011) of an annular structure, flanges (212) protruding outwards are arranged on the outer circumference of both ends of the first body (2011), the flanges (212) at both ends of the first body (2011) are arranged axially along the fixed axis (1) and form an inwardly recessed placement groove (213) between the flanges (212) and the first body (2011), a plurality of magnetic steels (202) are arranged on the end surfaces of both ends of the first body (2011) along the axial direction of the fixed axis (1), and the plurality of magnetic steels (202) are arranged in the placement grooves (2013) and distributed along the circumference of the first body (2011); The internal stator assembly (3) in each layer of the disk-type unit comprises a stator core (301), the stator core (301) comprising two second bodies (3011) of annular structure, the two second bodies (3011) being respectively arranged in placement slots (2013) at two ends of the first body (2011), the two second bodies (3011) being each provided with a coil assembly (3012) opposite to the magnetic steel (202), and the coil assemblies (3012) in the multiple layers of the disk-type units being connected in parallel with each other; The inner stator assembly (3) further comprises two stator mounting plates (3013), the two stator mounting plates (3013) being arranged corresponding to the two second bodies (3011), the second bodies (3011) being fixed on the corresponding stator mounting plates (3013), the second bodies (3011) being located between the stator mounting plates (3013) and the magnetic steel (202), the stator mounting plates (3013) being arranged in the placement groove (2013) and having a gap, and the stator mounting plates (3013) on the multiple layers of the disc-type units are all mounted on the fixed shaft (1); The outer rotor assembly (2) further comprises an outer steel cylinder (203), and the rotor rollers (201) in each layer of the disc-type units are fixedly connected to the outer steel cylinder (203); The rotor roller (201) and the outer steel cylinder (203) in each layer of the disc-type units are fixedly connected to each other via a key connection, a long groove is provided on the inner peripheral wall of the outer steel cylinder (203) along its axial direction, a first key groove is provided on the outer peripheral wall of the rotor roller (201) in each layer of the disc-type units, the first key groove and the long groove in each layer of the disc-type units are arranged correspondingly, and a key is provided between the first key groove and the long groove in each layer of the disc-type units; End covers (204) are fixedly mounted on both ends of the outer steel cylinder (203); the end covers (204) on both ends of the outer steel cylinder (203) are rotatably mounted on the fixed shaft (1); and a cavity (6) is formed between the fixed shaft (1), the outer steel cylinder (203) and the end covers (204) on both ends; The stator mounting plates (3013) on both sides of each layer of the disk-type units are provided with heat dissipation hole groups (404), and the heat dissipation hole groups (404) on the stator mounting plates (3013) in the two adjacent layers of the disk-type units are arranged correspondingly, and the heat dissipation hole groups (404) are used to transfer heat in the disk-type units on one side to the disk-type units on the other side.

2. The disc-type multi-layer outer rotor motor according to claim 1, characterized in that: Each layer of the disc-type units is provided with a terminal post (302) fixed on a stator mounting plate (3013); the terminal post (302) located on one of the two stator mounting plates (3013) is a connecting male head (3021); the terminal post (302) located on the other of the two stator mounting plates (3013) is a connecting female head (3022); the coil assembly (3012) is correspondingly connected to the terminal post (302); the connecting female heads (3022) of the terminal posts (302) on the disc-type units of the previous layer on the disc-type units of the two adjacent layers are butted with the connecting male heads (3021) of the terminal posts (302) on the disc-type units of the next layer.

3. The disc-type multi-layer outer rotor motor according to claim 1, characterized in that: The heat dissipation mechanism (4) comprises a cooling water pipe (401) arranged on two stator cores (301) in each layer of the disc-type unit, one end of the cooling water pipe (401) is an input port, and the other end of the cooling water pipe (401) is an output port, an input channel (403) for inputting a cooling medium and an output channel (402) for outputting a cooling medium are arranged on the fixed shaft (1), the input port of the cooling water pipe (401) on each layer of the disc-type unit is in communication with the input channel (403), and the output port of the cooling water pipe (401) on each layer of the disc-type unit is in communication with the output channel (402).

4. The disc-type multi-layer outer rotor motor according to claim 3, characterized in that: The coil assembly (3012) is arranged at one end of the stator core (301) close to the magnetic steel (202), and the cooling water pipe (401) is arranged at one end of the stator core (301) away from the magnetic steel (202).

5. The disc-type multi-layer outer rotor motor according to claim 4, characterized in that: The cooling water pipe (401) is arranged in a meandering manner along the circumferential direction of the stator core (301).

6. The disc-type multi-layer outer rotor motor according to claim 1, characterized in that: Both ends of the fixed shaft (1) are fixedly connected to fixed seats (5); the outer rotor assembly (2) and the inner stator assembly (3) are located between the fixed seats (5) at both ends; and the fixed seats (5) are used to fix the fixed shaft (1).

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