De-excitation device and variable-diameter permanent magnet motor

Abstract

The utility model relates to a de-excitation device and a variable-diameter permanent magnet motor, the permanent magnet motor takes a motor unit as a motor module, and a plurality of motor modules are adopted to work in a cascading manner; the external connection structures of the motor units are the same, and the number of the motor units and the outer diameter of each motor unit are determined according to the internal configuration of the ducted fan hub. The ratio of the axial length to the diameter of the motor unit is not greater than 1, the motor adopts a concentrated winding motor type, and each winding is wound by taking a single tooth as a shaft; and a de-excitation device is arranged in the variable-diameter modularized cascade motor system. The modular cascade design is adopted, flexible change can be achieved according to the structure of the ducted fan hub, the traditional limitation is broken through, the hub space is fully utilized, the power density is improved, and customization is facilitated; the flat configuration optimization enables the motor to realize high-power output in a small volume, effectively utilizes copper wires, reduces copper loss, improves efficiency, simplifies a manufacturing process, and reduces cost and assembly difficulty.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of aviation propulsion technology, specifically to a magnetic field elimination device and variable-diameter permanent magnet motor. BACKGROUND

[0002] The starting and running of the permanent magnet synchronous motor depend on the interaction of the magnetic field generated by the stator winding, the rotor squirrel cage winding and the permanent magnet. In unstable environments such as high temperature and high pressure, real-time monitoring of the rotor magnetic variable of the permanent magnet motor is crucial to ensure stable operation of the motor and prevent production accidents.

[0003] The patent number 201910403121.3 of the electric ducted fan thermal coupling design method, the hub ratio and structure requirement of the motor are integrated into the design process of the ducted fan, which can make the design result of the ducted fan meet the use requirements of multiple working conditions, at the same time, make the motor meet the structure requirement (the heat dissipation of the motor shell surface is greater than the heat generation of the motor) and minimize the volume of the motor, so as to improve the power to weight ratio of the motor in the ducted fan.

[0004] But the motor shell structure calculation is not accurate; only one kind of electric ducted fan configuration method is considered; only the equivalent section motor configuration is considered; the structure installation and other aspects are not considered.

[0005] In the design of the ducted fan, the motor outer diameter is a key parameter, because it directly affects the aerodynamic performance, efficiency, size and overall design of the fan:

[0006] 1) The design space of the ducted fan is limited, and the motor outer diameter needs to be optimized within the allowed space to maximize the power density or minimize the overall size while meeting the design requirements;

[0007] 2) The motor outer diameter also needs to consider the gap between other components (such as fan blades, air inlet, air outlet) to avoid mechanical interference, ensure smooth airflow, and provide enough maintenance space;

[0008] 3) The size of the motor will affect the design and arrangement of the blades. It is necessary to ensure that the motor outer diameter matches the diameter, shape and layout of the blades to improve aerodynamic efficiency, reduce noise and optimize the overall performance of the fan.

[0009] In summary, the selection of the motor outer diameter needs to consider the space constraints, such as Figure 1 As shown in the figure, the traditional modular cascade motor 11 adopts ordinary axial flux and radial flux configuration, so the motor can only be placed in the equivalent section, or the minimum outer diameter is taken as the design point, and the space inside the hub cannot be fully utilized to improve the power density of the motor.

[0010] The information disclosed in this section is only intended to deepen the understanding of the overall background of the present application and should not be regarded as acknowledging or implying in any form that the information constitutes the prior art known to those skilled in the art. Content of the present application

[0011] In view of the defects in the prior art, the present application aims to provide a demagnetization device and a variable-diameter permanent magnet motor, which adopts modular cascade design and can flexibly change the hub configuration of the fan, breaks through the traditional limitations, fully utilizes the hub space to improve the power density, and is convenient for customization; the flat configuration optimization enables the motor to realize high power output in a small volume, effectively utilizes copper wire, reduces copper loss, improves efficiency, simplifies manufacturing process, and reduces cost and assembly difficulty; the structural cooperation innovation enhances stability through stop cooperation and bolt fixation, and optimizes the structural details of the shaft tail end and the rear end cover to ensure accurate centering and long-term stable operation.

[0012] To achieve the above purpose, the technical scheme adopted by the present application is:

[0013] A demagnetization device, characterized in that it comprises a demagnetization valve and a control mechanism.

[0014] The demagnetization valve comprises a spring, a movable valve and a base.

[0015] The spring is arranged at the center area of the movable valve and controls the opening and closing state of the movable valve through elastic restoring force; when the external force disappears, the spring automatically resets the movable valve to return to the original position.

[0016] The spring and the movable valve work cooperatively to realize the following opening and closing functions:

[0017] When the movable valve is closed, the connection between the motor and the load is closed, preventing the bearing from sliding in and preventing foreign matter from entering.

[0018] When the movable valve is opened, the connection between the motor and the load is disconnected.

[0019] On the basis of the above technical scheme, the base is arranged at the motor shaft connection, supporting the movement of the movable valve, providing stable support and positioning, so that the movable valve can accurately align with the load shaft and form a good sealing surface.

[0020] On the basis of the above technical scheme, the control mechanism is arranged at the non-driving end surface of the motor, and the control mechanism comprises an electromagnetic valve.

[0021] When demagnetization is needed, the electromagnetic valve is energized to close and generate pressing force, the movable valve is pressed towards the load side, so that the motor is tightly connected with the load.

[0022] The pressing force generated by the electromagnetic valve overcomes the restoring force of the spring, so that the movable valve is tightly closed on the motor shaft to form a sealing surface.

[0023] When the electromagnetic valve is powered off and the pressing force disappears, the restoring force of the spring pushes the movable valve back to the original position, disconnecting the motor shaft and the load.

[0024] A variable-diameter permanent magnet motor, characterized in that a motor unit is used as a motor module, and multiple motor modules are used in cascade operation.

[0025] The external connection structures of the motor units are the same, the number of motor units and the outer diameters of the motor units are flexibly determined according to the internal configuration of the duct fan hub, and a variable-diameter modular cascade motor system is formed.

[0026] The ratio of the axial length to the diameter of the motor unit is not greater than 1, and the motor selects a concentrated winding motor structure, and each winding is wound around a single tooth.

[0027] The variable-diameter modular cascade motor system is provided with the magnetic field elimination device of any one of the foregoing.

[0028] On the basis of the above technical scheme, the motor shafts of the motor units are rigidly interconnected.

[0029] On the basis of the above technical scheme, the motor units adopt a six-phase or double three-phase configuration, and the pole-slot number needs to meet the asymmetric condition and necessary condition, and the optional pole-slot number combination is any one of the following:

[0030] 12 / 8, 12 / 10, 12 / 14, 12 / 16, 18 / 14, 18 / 16, 18 / 20, 18 / 22, 24 / 16, 24 / 22, 24 / 26, 30 / 22, 30 / 26, 30 / 28, 30 / 32, 30 / 34, 30 / 38, 30 / 40, 36 / 26, 36 / 30, 36 / 34, 36 / 38, 36 / 42, 36 / 46.

[0031] On the basis of the above technical scheme, the front end cover of the casing is machined with an external stop, the rear end cover is provided with an internal stop, and accurate cooperation is achieved during assembly to prevent radial displacement, ensure accurate centering and stable operation of the motor system, and guarantee the stability of the motor mechanical structure.

[0032] On the basis of the above technical scheme, the cascade motor modules are fixed by bolts to enhance the stability between the modules, avoid faults or performance degradation caused by radial movement, and ensure the reliability of the cooperative work of multiple motor modules.

[0033] On the basis of the above technical scheme, the shaft tail end is provided with a shaft body matching hole, which facilitates the flat key connection and torque transmission with other motor modules, and realizes effective connection and power transmission of the motor shaft system.

[0034] On the basis of the above technical scheme, the rear end cover is embedded with a rotary transformer, so that cascade extrusion is prevented, the measurement accuracy of the motor system is improved, accurate feedback is provided for motor control and monitoring, and long-term stable operation is ensured.

[0035] The magnetic field elimination device has the following beneficial effects:

[0036] 1. Rapid magnetic field elimination capability: The device has strong magnetic field elimination capability and fast magnetic field elimination speed, can quickly cut off the excitation power source when needed, and prevents transient overvoltage at both ends of the rotor winding. This is crucial for ensuring the safe operation of the motor and connected equipment in emergency situations, especially in fields such as aviation propulsion that require extremely high safety.

[0037] 2. Implementation of magnetic field elimination and re-excitation: By setting a magnetic field elimination valve composed of a spring, a movable valve, and a base at the load connection, and setting an electromagnetic valve to control the magnetic field elimination valve at the non-driving end face of the motor, the functions of magnetic field elimination and re-excitation are realized. This design not only effectively realizes magnetic field elimination operation, but also restores the excitation state of the motor when needed, without causing irreversible damage to critical components, improving the reliability and service life of the motor.

[0038] 3. Collaborative design with variable-diameter permanent magnet motor: The design of the magnetic field elimination device fully considers the collaborative work with the variable-diameter permanent magnet motor. For example, the embedded design of the rotary transformer avoids the extrusion problem caused by the close fit between modules, ensuring the normal operation of the magnetic field elimination device in the cascade state of the motor. In addition, the control mechanism of the magnetic field elimination device interacts with the electromagnetic system of the motor, realizing effective control of the motor magnetic field, and embodying the close integration of the two in technical innovation.

[0039] The variable-diameter permanent magnet motor has the following beneficial effects:

[0040] 1. Modular cascade design: The modular cascade motor system with variable diameter uses a motor unit as a module, and multiple motor modules work in a cascade manner. This design can flexibly change according to the internal configuration of the duct fan hub, breaking through the limitation of traditional motors that can only be installed in equal sections or designed with the smallest outer diameter, and can fully utilize the space inside the hub to improve the power density of the motor, providing greater flexibility for customized design and application of the motor.

[0041] 2. Flat configuration optimization: The unit motor adopts a flat configuration, which allows the motor to provide higher power output in a smaller volume, while realizing more efficient copper wire utilization, reducing copper loss, and improving overall efficiency. In addition, the design of concentrated winding also simplifies the manufacturing process, reduces winding difficulty and maintenance cost, and reduces the difficulty of internal wiring and assembly of the modular motor, which is of great significance to improving the production efficiency and reliability of the motor.

[0042] 3. Structural cooperation innovation: in the design of the shell and end cover, through the stop cooperation and the bolt fixation when the cascade connection, etc. Mode, enhance the stability and reliability of the whole series connection motor type. The shaft tail end is designed to have a hole matched with the shaft body, and the arrangement mode of embedding the rotary transformer in the rear end cover, which all reflect the optimization of the motor structure details, and ensure the accurate centering and long-term stable operation of the motor in the running process. BRIEF DESCRIPTION OF DRAWINGS

[0043] The utility model discloses the following drawings:

[0044] The drawings are used for better understanding the utility model, and do not constitute undue limitation on the utility model. Among them:

[0045] Figure 1 Traditional modular cascade motor schematic diagram.

[0046] Figure 2 The utility model discloses a variable-diameter permanent magnet motor structure schematic Figure 1 .

[0047] Figure 3 The utility model discloses a variable-diameter permanent magnet motor structure schematic Figure 2 .

[0048] Figure 4 The utility model discloses a variable-diameter permanent magnet motor demagnetization state schematic DETAILED DESCRIPTION

[0049] The utility model will be further explained in detail in combination with the drawings. The detailed description is made to the description of the exemplary embodiment of the utility model, and includes various details of the embodiment of the utility model to help understanding, and should be considered as only exemplary. Therefore, those skilled in the art should realize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the utility model. Similarly, in order to be clear and concise, the description is omitted in the following description.

[0050] As Figure 3 Shown, the utility model discloses a demagnetization device, including: demagnetization valve and control mechanism 31.

[0051] Demagnetization valve includes spring 32, movable valve 33 and base 34.

[0052] Spring 32 is arranged at the central region of movable valve 33, and the opening and closing state of movable valve 33 is controlled through the elastic restoring force, when the external force disappears, spring 32 makes movable valve 33 automatic reset, returns original position.

[0053] The spring 32 cooperates with the movable valve 33 to realize the following opening and closing functions:

[0054] When the movable valve 33 is closed, the connection between the motor and the load is closed, preventing the bearing 35 from sliding in and preventing foreign matter from entering;

[0055] When the movable valve 33 is opened, the connection between the motor and the load is disconnected.

[0056] The de-magnetization valve described in the embodiment mainly consists of a spring 32, a movable valve 33, and a base 34. The spring is arranged at the center of the movable valve to provide a rebounding effect, and controls the opening and closing state of the movable valve through elastic restoring force. After operation, the movable valve can automatically reset, i.e., return to the original position. The movable valve cooperates with the spring to realize the opening and closing function, and can realize the closing or opening of the driving end, prevent the bearing from sliding in, and prevent foreign matter from entering.

[0057] The working process is as follows: when the control mechanism 31 is stressed, the movable valve 33 is pressed down, and the base 34 is closed. When the control mechanism 31 is released, the movable valve 33 returns through the restoring force of the spring 32, and the base 34 is opened.

[0058] On the basis of the above technical solution, the base is arranged at the connection of the motor shaft 36 to support the movement of the movable valve 33, and by providing stable support and positioning, the movable valve 33 can be accurately aligned with the load shaft and form a good sealing surface.

[0059] On the basis of the above technical solution, the control mechanism is arranged at the non-driving end surface of the motor, and the control mechanism includes an electromagnetic valve.

[0060] When de-magnetization is needed, the electromagnetic valve is powered to generate pressing force, the movable valve is pressed to the load side, and the motor is tightly connected with the load.

[0061] The pressing force generated by the electromagnetic valve overcomes the restoring force of the spring, so that the movable valve is tightly closed on the motor shaft to form a sealing surface.

[0062] When the electromagnetic valve is de-energized and the pressing force disappears, the restoring force of the spring pushes the movable valve back to the original position, disconnecting the connection between the motor shaft and the load.

[0063] As shown in Figure 3 , Figure 4 The de-magnetization principle of the embodiment is as follows: by controlling the power-on or power-off of the control mechanism (electromagnetic valve), the stator 37 and the rotor 38 are misaligned by one level, the air gap 41 distance is increased, and the magnetic field generated by the permanent magnet cannot be effectively cut, so that the motor is de-magnetized.

[0064] The role of the de-magnetization device described in the embodiment in the motor system is as follows:

[0065] 1. Protect the key components of the motor: when the motor operates abnormally and needs to be de-excited, the excitation power supply is quickly cut off to prevent transient overvoltage at both ends of the rotor winding, avoid irreversible damage to the key components of the motor rotor, winding and other key components, ensure the overall safety and reliability of the motor, and prolong the service life of the motor.

[0066] 2. Maintain the stability of the motor operation: provide protection for the motor operation under complex working conditions, such as in unstable environments such as high temperature and high pressure, effectively control the motor magnetic variable, ensure the stable operation of the motor, avoid motor failure caused by abnormal magnetic field, maintain the stability of the motor performance, and reduce the risk of operation failure.

[0067] 3. Realize the function switching of the motor: support the flexible switching of the motor between normal operation and de-excitation state, and have the ability to recover after de-excitation, cooperate with the overall design of the motor, meet the needs of different working stages, such as during motor start, stop or special working condition processing, through de-excitation and re-excitation operation, make the motor adapt to various operating conditions, and improve the applicability and functionality of the motor.

[0068] As shown in Figure 2 , the utility model further gives a variable diameter permanent magnet motor, takes a motor unit 21 as a motor module, adopts multiple motor module cascade working;

[0069] The external connection structure of the motor unit 21 is same, the number of motor units 21 and the outer diameter of each motor unit 21 are flexibly determined according to the internal configuration of the duct fan hub, and a modular cascade motor system with variable diameter is formed; The motor unit 21 of the embodiment can be combined as required (that is, the outer diameter and number of motor units 21 can be determined according to the required outer envelope of the system, so that the internal configuration of the duct fan hub can be flexibly changed), breaking through the limitation of traditional motor outer diameter design, reducing the constraint of outer envelope surface, and forming a series of motors and further popularizing to other projects;

[0070] The ratio of the axial length to the diameter of the motor unit 21 is not greater than 1, the motor selects a concentrated winding motor structure, each winding 22 is wound around a single tooth, as shown in Figure 3 ; In order to ensure that the axial length of the motor shaft is as short as possible, the motor unit 21 of the embodiment adopts a flat configuration to ensure that the ratio of the axial length to the diameter of the motor unit 21 is not greater than 1; The winding is concentrated in a few slots, the motor unit 21 can realize high power output in small volume, improve the copper utilization rate, reduce the copper loss and manufacturing process complexity, reduce the winding and maintenance difficulty and internal wiring assembly difficulty, and the design of concentrated winding reduces the number of windings and simplifies the manufacturing process;

[0071] A de-excitation device is arranged in the modular cascade motor system with variable diameter, and the de-excitation device comprises a de-excitation valve and a control mechanism.

[0072] The demagnetization valve is arranged at the motor shaft connection;

[0073] The control mechanism is arranged at the non-driving end surface of the motor.

[0074] On the basis of the above technical solution, the motor shafts of the motor units are rigidly interconnected.

[0075] Due to the multi-motor module cascade working mode, the conventional motor cannot be simply used as the motor unit, and the volume and weight of the single motor module need to be reduced, so that the motor shafts are not easily disturbed by rigid interconnection.

[0076] On the basis of the above technical solution, the motor units adopt a six-phase or double three-phase configuration, and the pole-slot number needs to meet the asymmetric condition (to avoid vibration and noise) and the necessary condition (to ensure electromagnetic performance). The optional pole-slot number combinations are any one of the following:

[0077] 12 / 8, 12 / 10, 12 / 14, 12 / 16, 18 / 14, 18 / 16, 18 / 20, 18 / 22, 24 / 16, 24 / 22, 24 / 26, 30 / 22, 30 / 26, 30 / 28, 30 / 32, 30 / 34, 30 / 38, 30 / 40, 36 / 26, 36 / 30, 36 / 34, 36 / 38, 36 / 42, 36 / 46.

[0078] The aviation motor needs extremely high reliability, because any failure can lead to serious consequences. In order to improve safety, the motor units adopt a six-phase or double three-phase configuration, which can ensure that the motor continues to work normally when a certain phase fails.

[0079] The pole-slot number refers to the number of poles and slots in the motor. The pole is the number of magnetic poles, and the slot is the number of slots in the stator where the winding is placed. The selection of the pole-slot number directly affects the performance of the motor, such as torque, efficiency, and vibration. In a six-phase or double three-phase motor, the pole-slot number needs to meet certain conditions to ensure that the motor can work normally and has fault tolerance. These conditions include the asymmetric condition (to avoid vibration and noise) and the necessary condition (to ensure electromagnetic performance). This embodiment determines the unit motor pole-slot number (such as 12 / 8, 12 / 10, etc. multiple combinations, 12 / 8 means 12 slots with 8 poles) suitable for aviation demagnetization motors under the safety requirements of aviation motors, taking into account safety and performance optimization.

[0080] On the basis of the above technical solution, the front end cover of the casing is machined with an external stop, the rear end cover is provided with an internal stop, and accurate fitting is achieved during assembly to prevent radial displacement, ensure accurate centering and stable operation of the motor system, and guarantee the stability of the motor mechanical structure.

[0081] In the design of the casing and the end cover, the stability and reliability of the series motor type adopted by the entire variable-diameter modular cascade motor system need to be ensured through structural cooperation. The casing and the end cover are cooperated through the stopper, and the outer stopper is processed on the outer front end cover, and the rear end cover is provided with the inner stopper matched with the outer stopper. In this way, the front end cover and the rear end cover can effectively prevent radial displacement through the accurate cooperation of the inner and outer stoppers during assembly, and ensure the accurate centering and stable operation of the motor system.

[0082] On the basis of the above technical scheme, the cascade motor modules are fixed through bolts, the stability between the modules is enhanced, the fault or performance decline caused by radial movement is avoided, and the reliability of the cooperative work of the multiple motor modules is ensured.

[0083] When the motor system needs to be cascaded, the motor modules are fixed together through bolts. This connection mode not only enhances the stability between the modules, but also effectively avoids the system fault or performance decline caused by the radial movement between the modules.

[0084] On the basis of the above technical scheme, the tail end of the shaft is provided with a shaft body cooperation hole, so that the torque can be transmitted through the flat key connection with other motor modules, and effective connection and power transmission of the motor shaft system are realized.

[0085] In the embodiment, the tail end of the motor shaft is designed to have a hole matched with the shaft body. Another motor module is allowed to be connected with the shaft through a flat key, so that the torque can be effectively transmitted.

[0086] On the basis of the above technical scheme, the rear end cover is embedded with a rotary transformer, the extrusion during cascading is prevented, the measurement accuracy of the motor system is improved, accurate feedback is provided for motor control and monitoring, and long-term stable operation is ensured.

[0087] In the embodiment, the rotary transformer is embedded in the rear end cover. During the cascading of the motor, the embedded design of the rotary transformer can prevent the extrusion problem caused by the close cooperation between the modules, so that the normal work is ensured. The reasonable arrangement of the rotary transformer not only improves the measurement accuracy of the motor system, but also ensures the long-term stable operation of the system.

[0088] A kind of magnetic device and variable-diameter permanent magnet motor described in the utility model compared with prior art:

[0089] 1, the permanent magnet motor mentioned in the patent can provide lower level interference to the magnetic field generated by the stator due to the variable-diameter design, thereby reducing the magnetic flux leakage and providing better performance than asynchronous motor;

[0090] 2, compared with conventional permanent magnet motor, variable-diameter permanent magnet motor can generate more torque, especially at high speed, low torque and high torque, motor efficiency can be improved;

[0091] 3. The demagnetization device of the permanent magnet motor rotor can directly magnetize after the permanent magnet of the rotor is demagnetized, avoids the assembly error generated when the permanent magnet is replaced, and ensures that the magnetic field strengths of the permanent magnets are consistent after magnetization is completed.

[0092] The contents not described in detail in the specification belong to the prior art known to the person skilled in the art.

[0093] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiment, but any equivalent modification or change made by the person skilled in the art according to the disclosed content of the present application shall be included in the protection scope recorded in the claims.

Claims

1. A demagnetizing device, characterized in that, The application relates to a de-excitation valve and a control mechanism. The de-excitation valve comprises a spring, a movable valve and a base. The spring is arranged in a central region of the movable valve and controls the opening and closing state of the movable valve through elastic restoring force; when external force disappears, the spring automatically resets the movable valve to return to the original position. The spring cooperates with the movable valve to realize the following opening and closing functions: When the movable valve is closed, the connection between the motor and the load is blocked, preventing the bearing from sliding in and preventing foreign matters from entering; When the movable valve is opened, the connection between the motor and the load is disconnected. The base is arranged at the motor shaft connection and supports the movement of the movable valve, and through the provision of stable support and positioning, the movable valve can be accurately aligned with the load shaft and a good sealing surface is formed.

2. A magnetic field elimination device according to claim 1, characterized in that The control mechanism is arranged at the non-driving end surface of the motor, and the control mechanism comprises an electromagnetic valve.

3. A magnetic field elimination device as claimed in claim 1, characterized in that When de-excitation is needed, the electromagnetic valve is powered to generate pressing force, the movable valve is pressed to the load side, and the motor is tightly connected with the load; The pressing force generated by the electromagnetic valve overcomes the restoring force of the spring, so that the movable valve is tightly closed on the motor shaft to form a sealing surface; When the pressing force disappears after the electromagnetic valve is powered off and reset, the restoring force of the spring pushes the movable valve back to the original position, disconnecting the motor shaft and the load. A motor unit is taken as a motor module, and a plurality of motor modules are connected in cascade; 4. A variable diameter permanent magnet motor, characterized by, The external connection structure of the motor units is the same, the number of the motor units and the outer diameter of each motor unit are flexibly determined according to the internal configuration of the duct fan hub, and a variable-diameter modular cascade motor system is formed; The ratio of the axial length to the diameter of the motor unit is not greater than 1, and the motor adopts a concentrated winding structure, and each winding is wound around a single tooth. The de-excitation device of any one of claims 1-3 is arranged in the variable-diameter modular cascade motor system. The motor shafts of the motor units are rigidly interconnected.

5. A variable diameter permanent magnet motor as claimed in claim 4, wherein, The motor unit adopts a six-phase or double-three-phase structure, the pole-slot number needs to meet the asymmetric condition and necessary condition, and the optional pole-slot number combination is any one of the following:

6. A variable diameter permanent magnet motor as claimed in claim 4, wherein, The front end cover of the motor housing is machined with an external stop, the rear end cover is provided with an internal stop, accurate cooperation is achieved during assembly to prevent radial displacement, the motor system is accurately centered and stably operated, and the mechanical stability of the motor is ensured. 12 / 8、12 / 10、12 / 14、12 / 16、18 / 14、18 / 16、18 / 20、18 / 22、24 / 16、24 / 22、24 / 26、30 / 22、30 / 26、30 / 28、30 / 32、30 / 34、30 / 38、30 / 40、36 / 26、36 / 30、36 / 34、36 / 38、36 / 42、36 / 46。 7. A variable diameter permanent magnet motor as claimed in claim 4, wherein, The cascade motor modules are fixed through bolts to enhance the stability between the modules, avoid radial movement to cause faults or performance degradation, and ensure the reliability of the cooperative work of the multiple motor modules.

8. A variable diameter permanent magnet motor as claimed in claim 4, wherein, The shaft tail end is provided with a shaft body matching hole, the torque can be transmitted through the flat key connection with other motor modules, effective connection of the motor shaft system and power transmission are realized.

9. A variable diameter permanent magnet motor as claimed in claim 4, wherein, The rear end cover is embedded with a rotary transformer to prevent cascade extrusion, improve the measurement accuracy of the motor system, provide accurate feedback for motor control and monitoring, and ensure long-term stable operation.

10. A variable diameter permanent magnet motor as claimed in claim 4, wherein, ​

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