A multi-stator permanent magnet motor

Abstract

This invention discloses a multi-stator permanent magnet motor, comprising an outer casing, a motor shaft, multiple electromagnetic components, and multiple inner water jackets. The electromagnetic components are arranged axially along the motor, each including a rotor core and a stator core, with a first magnetic isolation ring abutting between adjacent rotor cores. The inner peripheral wall of each inner water jacket abuts against the outer peripheral wall of the corresponding stator core, and a second magnetic isolation ring abuts between adjacent inner water jackets. Sealing components are provided between the inner water jacket and the outer casing, and between the inner water jacket and the second magnetic isolation ring. By using multiple inner water jackets, the uniformity and adaptability requirements of the water cooling channel for the multi-stator permanent magnet motor are met, improving the motor's suitability for extreme environments. The sealing components prevent water leakage in the water cooling channel, effectively improving the reliability of the multi-stator permanent magnet motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a multi-stator permanent magnet motor. Background Technology

[0002] Multi-stator series structures can increase the torque / power density of motors within limited axial space, meeting the requirements of high acceleration performance and long driving range for vehicles. Multi-stator series motors can provide solutions for various demanding work scenarios, such as rail transit with strict limitations on motor size and weight, the confined space of ship engine rooms, and special equipment with extreme requirements for motor size, weight, and reliability. Furthermore, considering the motor's applicability in extreme environments (high temperature, low temperature, vacuum), a water-cooled jacket is typically designed as a temperature control unit, working in conjunction with a coolant circulation system to achieve precise temperature regulation of the motor.

[0003] However, existing water-cooled jacket structures are primarily developed for traditional single-stator permanent magnet motors. They typically feature a welded, integrated water channel, with the coolant flowing within the frame's interlayer. Heat is transferred sequentially through the stator core, housing, and coolant. The coolant flow is unidirectional, resulting in a significant temperature difference between the upstream and downstream sides, making it unsuitable for the uniform axial heat dissipation requirements of multi-stator motors. Furthermore, the internal water channels of existing water-cooled jackets rely on welding. If directly applied to multi-stator motors, the large welding area at both ends leads to numerous weld seams, making defect detection difficult and increasing the risk of leakage under long-term vibration or pressure fluctuations. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stator permanent magnet motor with uniform heat dissipation and stable sealing.

[0005] To achieve this objective, the present invention adopts the following technical solution: a multi-stator permanent magnet motor, comprising an outer casing, a motor shaft, multiple electromagnetic components, and multiple inner water jackets. The outer casing has end caps connected to both ends, and the motor shaft is rotatably connected to the end caps. Multiple electromagnetic components are arranged at intervals along the axial direction of the motor. Each electromagnetic component includes a rotor core fixed to the motor shaft and a stator core arranged around the rotor. A first magnetic isolation ring abuts between two adjacent rotor cores. The inner water jackets are correspondingly arranged with each electromagnetic component and fixed to the outer casing. The inner peripheral wall of each inner water jacket abuts against the outer peripheral wall of the corresponding stator core. A water-cooling channel for circulating coolant is defined between the inner water jacket and the outer casing. A second magnetic isolation ring abuts between two adjacent inner water jackets. Sealing components are provided between the inner water jacket and the outer casing, and between the inner water jacket and the second magnetic isolation ring.

[0006] Preferably, the sealing assembly includes a first sealing ring and a second sealing ring. Two first sealing rings abut against the inner water jacket and the outer jacket. The two first sealing rings are distributed on both sides of the water cooling channel along the axial direction of the motor shaft, and the two second sealing rings abut against the two end faces of the inner water jacket along the axial direction of the motor shaft.

[0007] Preferably, the thickness of the second magnetic shielding ring and the thickness of the inner water jacket are equal along the radial direction of the motor shaft.

[0008] Preferably, along the axial direction of the motor shaft, the length of the inner water jacket is greater than or equal to the length of the corresponding stator core.

[0009] Preferably, the inner water jacket is connected to the outer jacket by a plurality of fastening components, the plurality of fastening components being spaced apart circumferentially along the outer jacket, and each fastening component including at least two screws spaced apart axially along the motor shaft.

[0010] Preferably, a junction box is fixed to one end of the outer wall of the outer sleeve, each stator core has a power line, the outer sleeve is provided with multiple outlets, the outlets are arranged one-to-one with the stator cores, the outlets are located along the axial direction of the motor shaft on the side of the corresponding stator core near the junction box, and the power line passes through the outlet and is connected to the junction box.

[0011] Preferably, the multi-stator permanent magnet motor further includes multiple water-cooling systems, and the water-cooling systems and the water-cooling channels are connected in a one-to-one correspondence.

[0012] Preferably, the outer peripheral wall of the motor shaft is welded with multiple radial ribs, which are arranged radially along the circumference of the motor shaft. Each radial rib is provided with an inner positioning platform. The motor shaft is connected to a rotor sleeve. The stator core and the first magnetic isolation ring are both fitted onto the radial ribs. Along the axial direction of the motor shaft, the stator core at both ends abuts against the inner positioning platform and the rotor sleeve, respectively.

[0013] Preferably, the outer jacket is a one-piece molded part.

[0014] Preferably, the permanent magnets of two adjacent rotor cores are arranged in a staggered manner along the circumferential direction of the motor shaft.

[0015] The beneficial effects of this invention are as follows: When the multi-stator permanent magnet motor is working, each stator core and rotor core cooperate to apply torque to the motor shaft. Multiple electromagnetic components are connected in series, significantly increasing power density and expanding the output power range. Higher power and torque density are achieved within a limited volume, meeting the strict size and weight limitations imposed by the load equipment. By setting multiple internal water jackets, a modular design with one-to-one correspondence between electromagnetic components and water-cooling channels is achieved, ensuring temperature uniformity among the multiple electromagnetic components. This meets the uniformity and adaptability requirements of the multi-stator permanent magnet motor for the water-cooling channels, effectively improving the stability of the multi-stator permanent magnet motor and its suitability for extreme environments. By setting sealing components, the gaps between the internal water jackets and other components can be sealed without the need for traditional welded sealing structures, preventing water leakage from the water-cooling channels and effectively improving the reliability of the multi-stator permanent magnet motor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a multi-stator permanent magnet motor according to an embodiment of this application; Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0017] In the diagram: 1. Outer casing; 11. End cap; 12. Bearing; 13. Cable outlet; 14. Outer positioning platform; 2. Motor shaft; 21. Spoke rib; 211. Inner positioning platform; 22. Rotor sleeve; 3. Electromagnetic assembly; 31. Rotor core; 32. Stator core; 33. First magnetic isolation ring; 34. Second magnetic isolation ring; 4. Inner water jacket; 41. Water cooling channel; 42. Inner sleeve pressure ring; 5. Sealing assembly; 51. First sealing ring; 52. Second sealing ring; 6. Screw; 7. Junction box. Specific Implementation The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0022] Reference Figure 1 As shown, a multi-stator permanent magnet motor according to an embodiment of this application includes an outer casing 1, a motor shaft 2, multiple electromagnetic components 3, and multiple inner water jackets 4. End caps 11 are connected to both ends of the outer casing 1, and the motor shaft 2 is rotatably connected to the end caps 11. Specifically, two end caps 11 are connected to the front and rear ends of the outer casing 1 via flange structures. Bearings 12 are fixed at the center of each end cap 11. The rear end of the motor shaft 2 is located on the bearing 12 at the rear end of the outer casing 1, and the front end of the motor shaft 2 protrudes from the bearing 12 at the front end of the outer casing 1. Multiple electromagnetic components 3 are arranged at intervals along the axial direction of the motor. Each electromagnetic component 3 includes a rotor core 31 fixed to the motor shaft 2 and a stator core 32 arranged around the rotor. The rotor core 31 has permanent magnet material, such as neodymium iron boron, embedded in its peripheral wall, generating a constant magnetic field without external power supply. The stator core 32 includes a core support and three-phase windings surrounding the core support. When three-phase alternating current is applied, a rotating magnetic field is generated, driving the rotor core 31 to rotate. A first magnetic isolation ring 33 is abutting between two adjacent rotor cores 31.

[0023] The inner water jacket 4 is configured in a one-to-one correspondence with the electromagnetic component 3. Multiple inner water jackets 4 are fixedly connected to the outer jacket 1. The inner peripheral wall of the inner water jacket 4 abuts against the outer peripheral wall of the corresponding stator core 32. A water-cooling channel 41 for the circulation of coolant is defined between the inner water jacket 4 and the outer jacket 1. A second magnetic isolation ring 34 abuts between two adjacent inner water jackets 4. Both the first magnetic isolation ring 33 and the second magnetic isolation ring 34 are made of non-magnetic materials, such as copper or plastic. Sealing components 5 are provided between the inner water jacket 4 and the outer jacket 1, and between the inner water jacket 4 and the second magnetic isolation ring 34. Specifically, the inner wall of the front end of the outer jacket 1 is provided with an annular outer positioning platform 14. Among the multiple inner water jackets 4, the front inner water jacket 4 abuts against the outer positioning platform 14 and a sealing component 5 is provided between them. The rear inner water jacket 4 abuts against an inner sleeve pressure ring 42, and a sealing component 5 is provided between the rear inner water jacket 4 and the inner sleeve pressure ring 42. Sealing components 5 are provided on both sides of the other inner water jackets 4 located between the front and rear ends and between the two adjacent second magnetic isolation rings 34. Each inner water jacket 4 is provided with a sealing component 5 between it and the outer jacket 1. The sealing component 5 is used to seal the water cooling channel 41. In this embodiment, the coolant is a common liquid medium such as ethylene glycol, propylene glycol, or pure water. Two inner water jackets 4 and two electromagnetic components 3 are provided in a one-to-one correspondence. In other embodiments, three or six inner water jackets 4 and six electromagnetic components 3 can also be provided, which will not be elaborated here.

[0024] Understandably, when a multi-stator permanent magnet motor is operating, each stator core 32 and rotor core 31 cooperate to apply torque to the motor shaft 2. Multiple electromagnetic components 3 are connected in series, significantly increasing power density and expanding the output power range. This allows for higher power and torque density within a limited volume, meeting the stringent size and weight limitations imposed by the load equipment. Furthermore, multi-stator permanent magnet motors can flexibly combine electromagnetic components 3 of varying numbers and power to achieve a wide power range. By using a slender design with multiple electromagnetic components 3 connected in series and employing small-sized bearings 12, the rated and peak speeds of the motor can be increased, thereby increasing output power. In addition, multiple electromagnetic components 3 share a single motor shaft 2 and a pair of bearings 12, reducing material usage and lowering the production cost of multi-stator permanent magnet motors.

[0025] By setting multiple inner water jackets 4, a modular design with a one-to-one correspondence between electromagnetic components 3 and water-cooling channels 41 is achieved. This ensures temperature uniformity among the multiple electromagnetic components 3, avoids overload of the downstream electromagnetic components 3 (in the water-cooling channels 41), and meets the uniformity and adaptability requirements of multi-stator permanent magnet motors for the water-cooling channels 41. This effectively improves the operational stability and adaptability of multi-stator permanent magnet motors to extreme environments. By setting a sealing component 5, the gaps between the inner water jackets 4 and other components can be sealed without the need for traditional welded sealing structures, preventing water leakage in the water-cooling channels 41 and effectively improving the reliability of multi-stator permanent magnet motors.

[0026] The outer jacket 1 is a one-piece molded part. In this embodiment, the outer jacket 1 is integrally cast from HT300 cast iron. In other embodiments, the outer jacket 1 may be manufactured using other high-strength alloy materials and one-piece molding technology.

[0027] Using cast iron material to integrally mold the outer jacket 1 can effectively improve the mechanical structural strength of the outer jacket 1, while reducing the processing cost of the outer jacket 1.

[0028] Preferably, the permanent magnets of two adjacent rotor cores 31 are staggered along the circumference of the motor shaft 2. That is, each rotor core 31 is rotated around the motor shaft 2 by a fixed angle and then fixed, forming an overall staggered structure.

[0029] With the first magnetic isolation ring 33 set between the rotor cores 31 and the second magnetic isolation ring 34 set between the stator cores 32, the permanent magnets of the rotor cores 31 are arranged in a staggered manner so that the axial leakage magnetic flux of adjacent permanent magnets cancels each other out, reducing the overall axial leakage magnetic flux of the electromagnetic assembly 3, ensuring the symmetry of the air gap magnetic field of each stator core 32, and further improving the operating stability of the multi-stator permanent magnet motor.

[0030] Reference Figure 1 and Figure 2 As shown, the sealing assembly 5 includes a first sealing ring 51 and a second sealing ring 52. Two first sealing rings 51 abut against the inner water jacket 4 and the outer jacket 1, distributed along the axial direction of the motor shaft 2 on both sides of the water cooling channel 41. Two second sealing rings 52 abut against the two end faces of the inner water jacket 4 along the axial direction of the motor shaft 2. Specifically, the second sealing rings 52 located at both ends of the electromagnetic assembly 3 abut against the outer positioning platform 14 and the inner sleeve pressure ring 42, respectively, while the remaining second sealing rings 52 abut against the side wall end face of the inner water jacket 4 and between the adjacent second magnetic isolation ring 34 of the inner water jacket 4.

[0031] By setting the first sealing ring 51 and the second sealing ring 52, on the one hand, the structure of the sealing component 5 can be simplified and the assembly and use of the sealing component 5 can be facilitated. On the other hand, the first sealing ring 51 and the second sealing ring 52 cooperate to provide double sealing to the outer circular surface and the two end faces of the inner water jacket 4, thereby meeting the usage requirements of the water cooling channel 41 of "working pressure 0.3-0.8MPa, pressure resistance test 1.5 times the working pressure for 30 minutes without leakage", and further improving the applicability and reliability of the multi-stator permanent magnet motor.

[0032] In other embodiments, the sealing component 5 may also be a sealing structure filled with sealing filler, which, through the filler and the tortuous labyrinth sealing the outer circular surface and both end faces of the inner water jacket 4, meets the pressure resistance and pressure retention requirements of the water cooling channel 41, which will not be elaborated here.

[0033] Preferably, along the radial direction of the motor shaft 2, the thickness of the second magnetic isolation ring 34 is equal to the thickness of the inner water jacket 4 (the inner sleeve pressure ring 42 is also equal to the thickness of the inner water jacket 4).

[0034] Setting the thickness of the second magnetic shielding ring 34 and the inner water jacket 4 to be equal serves two purposes. First, it ensures that after the inner water jacket 4 and the second magnetic shielding ring 34 are installed, the inner circumferential walls of the inner water jacket 4 and the second magnetic shielding ring 34 are flush, facilitating the subsequent insertion and installation of the motor shaft 2 and the electromagnetic assembly 3, and improving the ease of installation and removal of the multi-stator permanent magnet motor. Second, the contact surfaces of the second magnetic shielding ring 34 and the inner water jacket 4 are correspondingly fitted, which can reserve sufficient installation space for the second sealing ring 52, ensuring that the second sealing ring 52 is centered and improving the structural rationality of the sealing assembly 5.

[0035] Preferably, along the axial direction of the motor shaft 2, the length of the inner water jacket 4 is greater than or equal to the length of the corresponding stator core 32.

[0036] The length of the inner water jacket 4 is set to be greater than the length of the corresponding stator core 32, so that the inner water jacket 4 can completely cover the outer peripheral wall of the stator core 32, thereby increasing the effective contact area between the water cooling channel 41 and the stator core 32 and improving the heat dissipation efficiency of the coolant.

[0037] Reference Figure 1 As shown, it can be understood that the inner water jacket 4 is connected to the outer jacket 1 by multiple fastening components. The multiple fastening components are arranged circumferentially around the outer jacket 1, and each fastening component includes at least two screws 6 arranged axially around the motor shaft 2. In this embodiment, each inner water jacket 4 is connected to three fastening components, and each fastening component includes two screws 6 (i.e., a total of six screws 6 are provided). The two screws 6 are symmetrically arranged on both sides of the water cooling channel 41 and located between the two first sealing rings 51. The three fastening components are arranged equidistantly at 120° intervals circumferentially around the outer jacket 1.

[0038] By fixing the inner water jacket 4 and the outer jacket 1 with screws 6 arranged along the circumference and axial direction of the outer jacket 1, the installation stability of the inner water jacket 4 can be effectively improved, while facilitating the installation or disassembly of the inner water jacket 4 and reducing the maintenance cost of the Duodongzi permanent magnet motor in the later stage.

[0039] Preferably, a junction box 7 is fixed to the rear outer wall of the outer casing 1. Each stator core 32 has a power line led out from its three-phase winding. The outer casing 1 is provided with multiple outlets 13, and the outlets 13 and stator cores 32 are arranged in a one-to-one correspondence. The outlets 13 are located on the side of the corresponding stator core 32 close to the junction box 7 along the axial direction of the motor shaft 2. The multiple outlets 13 are arranged at intervals along the circumference of the outer casing 1. The power line passes through the outlets 13 and is connected to the junction box 7.

[0040] By setting up a junction box 7 to control the stator core 32 of multiple electromagnetic components 3, the operator can individually control the output of each electromagnetic component 3, effectively improving the controllability and control precision of the multi-stator permanent magnet motor. The power lines of each stator core 32 appear through the outlet 13 near the junction box 7, and the multiple outlets 13 are staggered, which can reduce the wiring length of the power lines, avoid the entanglement of multiple power lines, and further improve the assembly efficiency and structural rationality of the multi-stator permanent magnet motor.

[0041] Furthermore, the multi-stator permanent magnet motor also includes multiple water-cooling systems, with each water-cooling system and water-cooling channel 41 connected in a one-to-one correspondence. The water-cooling system mainly consists of a water pump and a refrigeration module. Since the water-cooling system itself is a mature technology and is not the focus of this application, it will not be described in detail here.

[0042] The coolant in each water-cooled channel 41 is controlled by an independent water-cooling system, which allows the coolant in the water-cooled channel 41 to be controlled in terms of flow and temperature according to different needs. This ensures that the cooling (or heating) efficiency of the water-cooled channel 41 is matched with the power of the electromagnetic component 3, avoids overload operation of a single electromagnetic component 3, achieves balanced control of multiple electromagnetic components 3, and further improves the ultimate output power of the motor.

[0043] Continue to refer to Figure 1 As shown, it can be understood that multiple radial ribs 21 are welded to the outer peripheral wall of the motor shaft 2. The radial ribs 21 protrude from the side wall of the motor shaft 2 and are arranged radially along the circumference of the motor shaft 2. The radial ribs 21 are provided with inner positioning platforms 211. The motor shaft 2 is connected to a rotor pressure sleeve 22. The stator core 32 and the first magnetic isolation ring 33 are both fitted onto the radial ribs 21. Along the axial direction of the motor shaft 2, the stator cores 32 at both ends abut against the inner positioning platform 211 and the rotor pressure sleeve 22, respectively.

[0044] By setting the spokes 21, the stator core 32 and the first magnetic isolation ring 33 can be circumferentially positioned, and the deflection of the motor shaft 2 can be increased. The multiple spokes 21 axially support the motor shaft 2, avoiding bending and twisting problems when the slender motor shaft 2 rotates with multiple rotor cores 31, effectively improving the structural stability of the motor shaft 2, and further improving the operational stability of the multi-stator permanent magnet motor.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-stator permanent magnet motor, characterized in that, include: The outer sleeve (1) and the motor shaft (2) are provided. The two ends of the outer sleeve (1) are connected to end caps (11), and the motor shaft (2) is rotatably connected to the end caps (11). Multiple electromagnetic components (3) are arranged at intervals along the axial direction of the motor. Each electromagnetic component (3) includes a rotor core (31) fixed to the motor shaft (2) and a stator core (32) arranged around the rotor. A first magnetic isolation ring (33) abuts between two adjacent rotor cores (31). Multiple inner water jackets (4) are provided, each corresponding to one of the electromagnetic components (3) and fixed to the outer jacket (1). The inner peripheral wall of the inner water jacket (4) abuts against the outer peripheral wall of the corresponding stator core (32). A water cooling channel (41) for the circulation of coolant is defined between the inner water jacket (4) and the outer jacket (1). A second magnetic isolation ring (34) abuts between two adjacent inner water jackets (4). Sealing components (5) are provided between the inner water jacket (4) and the outer jacket (1) and between the inner water jacket (4) and the second magnetic isolation ring (34).

2. The multi-stator permanent magnet motor according to claim 1, characterized in that, The sealing assembly (5) includes a first sealing ring (51) and a second sealing ring (52). Two first sealing rings (51) abut against each other between the inner water jacket (4) and the outer jacket (1). The two first sealing rings (51) are distributed on both sides of the water cooling channel (41) along the axial direction of the motor shaft (2). The two second sealing rings (52) abut against the two end faces of the inner water jacket (4) along the axial direction of the motor shaft (2).

3. The multi-stator permanent magnet motor according to claim 2, characterized in that, Along the radial direction of the motor shaft (2), the thickness of the second magnetic isolation ring (34) is equal to the thickness of the inner water jacket (4).

4. The multi-stator permanent magnet motor according to claim 2, characterized in that, Along the axial direction of the motor shaft (2), the length of the inner water jacket (4) is greater than or equal to the length of the corresponding stator core (32).

5. The multi-stator permanent magnet motor according to claim 1 or 2, characterized in that, The inner water jacket (4) is connected to the outer jacket (1) by a plurality of fastening components. The plurality of fastening components are arranged circumferentially along the outer jacket (1), and each fastening component includes at least two screws (6) arranged axially along the motor shaft (2).

6. The multi-stator permanent magnet motor according to claim 1, characterized in that, A junction box (7) is fixed to one end of the outer wall of the outer sleeve (1). Each stator core (32) has a power line. The outer sleeve (1) is provided with multiple outlets (13). The outlets (13) and the stator cores (32) are arranged in a one-to-one correspondence. The outlets (13) are located along the axial direction of the motor shaft (2) on the side of the corresponding stator core (32) close to the junction box (7). The power line passes through the outlet (13) and is connected to the junction box (7).

7. The multi-stator permanent magnet motor according to claim 1 or 6, characterized in that, The multi-stator permanent magnet motor also includes multiple water cooling systems, and the water cooling systems and the water cooling channels (41) are connected in a one-to-one correspondence.

8. The multi-stator permanent magnet motor according to claim 1, characterized in that, The outer peripheral wall of the motor shaft (2) is welded with a plurality of radial ribs (21), which are arranged radially along the circumference of the motor shaft (2). Each radial rib (21) is provided with an inner positioning platform (211). The motor shaft (2) is connected to a rotor sleeve (22). The stator core (32) and the first magnetic isolation ring (33) are both fitted onto the radial ribs (21), and along the axial direction of the motor shaft (2), the stator cores (32) at both ends abut against the inner positioning platform (211) and the rotor sleeve (22) respectively.

9. The multi-stator permanent magnet motor according to claim 1, characterized in that, The outer jacket (1) is a one-piece molded part.

10. The multi-stator permanent magnet motor according to claim 1, characterized in that, The permanent magnets of two adjacent rotor cores (31) are arranged in a staggered manner along the circumferential direction of the motor shaft (2).

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