Motor and terminal equipment

Abstract

The invention provides a motor and terminal equipment, and belongs to the technical field of motors and driving systems thereof. According to the motor, an air gap adjusting module is arranged between a machine shell and a stator core and / or between a rotor core and a rotating shaft, the inner diameter of the stator core and / or the outer diameter of the rotor core are / is directly changed through radial deformation of a piezoelectric execution unit under controlled voltage, and the size of a radial air gap changes in real time along with the running state of the motor; therefore, high-frequency vibration and noise caused by non-uniform air gaps can be suppressed without disassembling the motor, iron loss and bore sweeping risks caused by too small air gaps are reduced, meanwhile, the situation that the size and cost of the motor are increased for compensating too large air gaps is avoided, and dynamic balance between electromagnetic performance and mechanical reliability is achieved.

Description

Technical Field

[0001] This application relates to the field of electric motors and their drive systems, and more specifically, to an electric motor and terminal equipment. Background Technology

[0002] The air gap, as the air gap between the stator and the rotor, is the core part of the motor's magnetic circuit. Its size determines the magnetic reluctance, magnetic flux density, and electromagnetic performance of the motor.

[0003] A well-designed air gap can optimize the magnetic circuit distribution, reduce iron losses, and improve the power factor, while ensuring the safe operation of the motor under high-speed or high-load conditions.

[0004] In elevators, cranes, textile machinery, automated production lines, and vehicles, precise control of the air gap is crucial for the efficient operation and long-term stability of motors.

[0005] With the development of technology, continuous optimization of air gap design and dynamic compensation technology have become important directions for improving motor performance.

[0006] During motor operation, the size of the air gap directly affects the distribution of magnetic flux. When the air gap is small, the magnetic reluctance decreases, the magnetic flux increases, the excitation current decreases, and the efficiency improves; however, an excessively small air gap may lead to magnetic saturation, increasing iron losses and causing localized overheating. Conversely, when the air gap is large, the magnetic reluctance increases, requiring a higher excitation current to maintain the magnetic flux, resulting in increased copper losses. Furthermore, uneven air gap can cause uneven magnetic pull, leading to torque fluctuations and mechanical vibrations, which in turn generate noise and additional losses.

[0007] Therefore, the design of the air gap needs to strike a balance between electromagnetic performance and mechanical reliability. Summary of the Invention

[0008] This application provides a motor and terminal equipment. The motor incorporates an air gap adjustment module between the motor housing and the stator core, and / or between the rotor core and the shaft. Utilizing the radial deformation of a piezoelectric actuator under controlled voltage, the inner diameter of the stator core and / or the outer diameter of the rotor core are directly altered. This allows the radial air gap size to change in real-time with the motor's operating state, thereby suppressing high-frequency vibration and noise caused by uneven air gaps without disassembling the motor. It also reduces the risk of iron loss and rotor rubbing due to excessively small air gaps, while avoiding increasing motor size and cost to compensate for excessive air gaps. This achieves a dynamic balance between electromagnetic performance and mechanical reliability. Specifically: The first aspect of this application provides a motor, including: chassis; The stator core is fixed inside the housing; The rotor core is arranged coaxially with the stator core, and a radial air gap is formed between the outer diameter of the rotor core and the inner diameter of the stator core. The air gap adjustment module includes at least a piezoelectric actuator, which can generate radial deformation under controlled voltage. The control unit is used to output a controlled voltage according to the operating status of the motor; in The air gap adjustment module is set between the housing and the stator core to change the inner diameter of the stator core through radial deformation, thereby adjusting the radial air gap size in real time. and / or The air gap adjustment module is set between the rotor core and the motor shaft to change the outer diameter of the rotor core through radial deformation, thereby adjusting the radial air gap size in real time.

[0009] In the above technical solution, there are multiple sets of piezoelectric actuators, which are distributed in the circumferential direction of the motor, and each set of piezoelectric actuators extends in the axial direction of the motor.

[0010] In the above technical solution, each piezoelectric actuator includes multiple layers of piezoelectric ceramic blocks, which are stacked together from the inside to the outside along the radial direction of the motor. The radial deformation ΔL of the piezoelectric actuator satisfies ΔL = d 33 ·V·N, where d 33 The value is a piezoelectric coefficient between 100 pm / V and 300 pm / V, where V is the controlled voltage and N is the number of layers in the piezoelectric ceramic block.

[0011] In the above technical solution, the piezoelectric actuator also includes: Metal thin film, the metal thin film is coated on the surface of the piezoelectric ceramic block.

[0012] In the above technical solution, the piezoelectric actuator also includes: A flexible metal sheet is attached to the surface of a thin metal film.

[0013] In the above technical solution, the air gap adjustment module also includes: The support frame has one side of the piezoelectric ceramic block fixed to it, while the opposite side presses against the outside of the stator core or the inside of the rotor core.

[0014] In the above technical solution, the air gap adjustment module is set between the housing and the stator core; The outer side of the support frame is fixed to the housing, and the inner side is fixed to the piezoelectric ceramic block. A metal film and a soft metal sheet are also stacked on the inner side of the piezoelectric ceramic block in sequence. The soft metal sheet presses against the outside of the stator core.

[0015] In the above technical solution, the supporting framework includes: A columnar frame, fitted and fixed to the inner ring of the housing, with openings at both axial ends; and The annular plate protrudes radially inward from the opening edge on one side of the columnar frame. One axial end face of the stator core rests against and is supported on the surface of the annular plate.

[0016] In the above technical solution, the motor also includes: The power amplifier module is electrically connected to the piezoelectric actuator unit via wires. It is used to amplify the voltage signal from the control unit and output it as a controlled voltage.

[0017] In the above technical solution, the power amplification module is used to amplify the micron-level original deformation generated by the air gap adjustment module to the millimeter-level effective deformation.

[0018] In the above technical solution, the motor is a servo motor.

[0019] A second aspect of this application provides a terminal device, which includes the aforementioned motor and an actuator driven by the motor; the terminal device is at least one of an elevator, a crane, textile machinery, an automated production line, or a vehicle.

[0020] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The motor provided in this embodiment of the application sets an air gap adjustment module between the housing and the stator core and / or between the rotor core and the shaft. By utilizing the radial deformation of the piezoelectric actuator under controlled voltage, the inner diameter of the stator core and / or the outer diameter of the rotor core are directly changed, so that the radial air gap size changes in real time with the motor's operating state. This suppresses high-frequency vibration and noise caused by uneven air gap without disassembling the motor, reduces the risk of iron loss and rotor rubbing caused by excessively small air gap, and avoids increasing the motor's size and cost to compensate for excessively large air gap, thus achieving a dynamic balance between electromagnetic performance and mechanical reliability. Attached Figure Description

[0021] Figure 1 This is a side sectional view of the motor in an embodiment of this application; Figure 2 This is a side cross-sectional view of the air gap adjustment module in an embodiment of this application; Figure 3 for Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the air gap adjustment module in the embodiment of this application from an axial side view. Figure 5 for Figure 4 A magnified structural diagram at point B in the middle.

[0022] in: 10-Casing: 20 - Stator core; 30 - Rotor core; 40 - Air gap adjustment module; 401 - Piezoelectric ceramic block; 402-metal film; 403 - Soft metal sheet; 404 - Supporting frame; 4041 - Columnar frame; 4042 - Ring-shaped plate; 50-Power Amplifier Module; 60-Wire; 70-Spindle. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] Throughout the specification and claims, the following terms will have at least the meaning explicitly associated herein, unless the context otherwise requires. The meanings defined below are not intended to limit the terms, but are merely illustrative examples. In the description of this invention, the phrase "in one embodiment" does not necessarily refer to the same embodiment, although it may refer to the same embodiment. Similarly, the phrase "in some embodiments," as used herein, does not necessarily refer to the same embodiment when used multiple times, although it may refer to the same embodiment. As used herein, the term "or" is an inclusive "or" operator and is equivalent to the term "and / or," unless the context clearly specifies otherwise. The term "based on" is not exclusive and allows for reliance on additional factors not described, unless the context clearly specifies otherwise. The word "exemplary" herein means "used as an example, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior to or better than other embodiments. The scope of this invention is limited only by the scope of the appended claims, and any examples set forth in this specification are not intended to be limiting, but merely illustrate some of the many possible embodiments of the claimed invention. The various embodiments provided in this invention should not be construed as limiting the scope of protection of this invention.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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 this invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 according to the specific circumstances.

[0028] 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.

[0029] Addressing the core pain points of existing technologies—namely, that "the air gap size is fixed after the motor leaves the factory and cannot be dynamically adjusted according to operating conditions such as load, speed, and temperature rise, leading to uneven air gaps causing high-frequency vibration and noise, excessively small air gaps increasing iron losses and the risk of rotor rubbing, and excessively large air gaps forcing an increase in motor size and cost"—this application proposes a solution of "directly embedding piezoelectric deformation into the motor's magnetic circuit." An air gap adjustment module is installed between the motor housing and the stator core, and / or between the rotor core and the shaft. Utilizing the radial deformation of a piezoelectric actuator under controlled voltage, the stator inner diameter or rotor outer diameter is changed in real time, thereby achieving closed-loop adjustment of the radial air gap size. This approach aims to achieve optimal magneto-mechanical performance of the motor under all operating conditions using micron-millimeter level precision deformation, balancing low vibration, low iron losses, small size, and high reliability, thus realizing the systematic technical goal of "online adjustable motor air gap."

[0030] Example like Figures 1-5 As shown, a first aspect of this application provides a motor, including: Casing 10; The stator core 20 is fixed inside the housing 10; The rotor core 30 is arranged coaxially with the stator core 20, and a radial air gap is formed between the outer diameter of the rotor core 30 and the inner diameter of the stator core 20. The air gap adjustment module 40 includes at least a piezoelectric actuator, which can generate radial deformation under controlled voltage. The control unit is used to output a controlled voltage according to the operating status of the motor; in The air gap adjustment module 40 is set between the housing 10 and the stator core 20 to change the inner diameter of the stator core 20 through radial deformation, thereby adjusting the radial air gap size in real time. and / or The air gap adjustment module 40 is set between the rotor core 30 and the motor shaft 70 to change the outer diameter of the rotor core 30 through radial deformation, thereby adjusting the radial air gap size in real time.

[0031] In this embodiment of the application, the motor has an air gap adjustment module 40 installed between the housing 10 and the stator core 20 and / or between the rotor core 30 and the shaft 70. By utilizing the radial deformation of the piezoelectric actuator under controlled voltage, the inner diameter of the stator core 20 and / or the outer diameter of the rotor core 30 are directly changed, so that the radial air gap size changes in real time with the motor's operating state. This suppresses high-frequency vibration and noise caused by uneven air gap without disassembling the motor, reduces the risk of iron loss and rotor rubbing caused by excessively small air gap, and avoids increasing the motor's size and cost to compensate for excessively large air gap, thus achieving a dynamic balance between electromagnetic performance and mechanical reliability.

[0032] It should be noted that the term "piezoelectric" mentioned in the embodiments of this application is short for "piezoelectric effect," which refers to the phenomenon that a specific crystal or ceramic exhibits surface charge when subjected to mechanical stress (positive piezoelectric effect), and conversely, undergoes mechanical deformation when subjected to an external electric field (inverse piezoelectric effect).

[0033] It should also be noted that the "controlled voltage" mentioned in the embodiments of this application is not a fixed DC voltage, nor is it a simple on / off switch, but a voltage signal whose amplitude (sometimes including frequency and phase) can be adjusted in real time according to external commands.

[0034] Furthermore, in some possible embodiments, the piezoelectric actuator has multiple sets, which are distributed in the circumferential direction of the motor, and each set of piezoelectric actuators extends along the axial direction of the motor. Preferably, the multiple sets of piezoelectric actuators are evenly distributed in the circumferential direction of the motor.

[0035] Furthermore, in some possible implementations, each set of piezoelectric actuators includes a multilayer piezoelectric ceramic block 401, which is stacked together from the inside to the outside along the radial direction of the motor. The radial deformation ΔL of the piezoelectric actuator satisfies ΔL = d 33 ·V·N, where d 33 The value is a piezoelectric coefficient between 100 pm / V and 300 pm / V, where V is the controlled voltage and N is the number of layers in the piezoelectric ceramic block 401.

[0036] In this embodiment, multilayer piezoelectric ceramic blocks 401 are stacked radially, and the deformation ΔL is locked to d. 33 The V·N configuration enables the piezoelectric actuator to precisely output radial deformation within a millimeter range. Multiple stacked piezoelectric actuators surround the stator core 20 or rotor core 30, with the deformation direction completely aligned with the air gap adjustment direction. This eliminates the need for additional transmission links, resulting in fast response and low hysteresis. Simultaneously, by utilizing the stacking multiplication effect, sufficient effective deformation can be obtained at a voltage of hundreds of volts. This reduces the voltage stress on the power amplifier module while ensuring real-time, micrometer- to millimeter-level fine adjustment of the radial air gap, thereby continuously suppressing vibration, noise, and iron loss, and maintaining the efficient and stable operation of the motor.

[0037] It should be noted that the main material of the piezoelectric ceramic block is lead zirconate titanate, and its core characteristic is its unique electromechanical conversion property. While possessing this unique conversion property, it also has a millimeter-level response speed and is low in cost, making it extremely cost-effective.

[0038] Of course, in some possible implementations, the piezoelectric ceramic block 401 can also be constructed as an arc-shaped columnar sheet, with each columnar sheet concentrically nested to form a ring-shaped stacked structure. By making the piezoelectric ceramic block 401 into an arc-shaped columnar sheet and concentrically nesting it to form a complete ring-shaped stack, the radial deformation is evenly distributed along the circumference, eliminating the gap dead zone present in the traditional segmented stacking, ensuring that the stator core 20 or rotor core 30 obtains continuous and synchronous inner or outer diameter changes throughout the entire circumference, thereby reducing high-frequency vibration and torque fluctuation caused by uneven air gap, and improving the smoothness and quietness of motor operation.

[0039] Furthermore, in some possible implementations, the piezoelectric actuator further includes: Metal film 402 is coated on the surface of piezoelectric ceramic block 401.

[0040] In this embodiment, a metal thin film is coated on the piezoelectric ceramic block to form an electric field, so as to facilitate the deformation of the piezoelectric ceramic block to generate displacement.

[0041] It should be noted that the thickness of this metal thin film 402 affects the distribution of the electric field inside the piezoelectric ceramic. If the film is too thin (<0.5μm), it will cause local stress concentration and cracks. If the film is too thick (>5μm), it will increase the equivalent thickness of the ceramic and reduce the ceramic displacement.

[0042] Therefore, the film thickness is approximately between 0.8 μm and 2.0 μm.

[0043] Furthermore, in some possible implementations, the piezoelectric actuator further includes: A flexible metal sheet 403 is attached to the surface of a metal film 402.

[0044] In this embodiment, by attaching the soft metal sheet 403 tightly to the outer layer of the metal film 402, stress concentration can be reduced and the service life of the entire mechanism can be improved.

[0045] Furthermore, in some possible implementations, the air gap adjustment module 40 also includes: The support frame 404 has one side of the piezoelectric ceramic block 401 fixed to the support frame 404, and the opposite side presses against the outside of the stator core 20 or the inside of the rotor core 30.

[0046] The support frame 404 in this embodiment can prevent the piezoelectric ceramic block from bending or breaking. Preferably, the support frame 404 is made of aluminum alloy, which has good fatigue resistance. Of course, in some alternative embodiments, the support frame 404 can also be made of a composite material that has the same rigid support and good fatigue resistance.

[0047] Furthermore, in some possible implementations, the air gap adjustment module is disposed between the housing 10 and the stator core 20; The outer side of the support frame 404 is fixed to the housing 10, and the inner side is fixed to the piezoelectric ceramic block 401. A metal film 402 and a soft metal sheet 403 are also stacked on the inner side of the piezoelectric ceramic block 401 in sequence. The soft metal sheet 403 presses against the outer side of the stator core 20.

[0048] In this embodiment, the support frame 404, piezoelectric ceramic block 401, metal film 402, and soft metal sheet 403 are sequentially pressed radially from the outside to the inside between the housing 10 and the stator core 20, forming a complete force chain of "rigid support - deformation generation - voltage equalization and conduction - flexible transmission". The radial deformation generated by the piezoelectric ceramic block 401 is evenly compressed by the metal film 402, and then the soft metal sheet 403 pushes the outside of the stator core 20 evenly, so that the inner diameter of the stator is reduced synchronously, realizing the micron-millimeter level online adjustment of the air gap. At the same time, it avoids local stress concentration and uneven circumferential deformation, further reducing the risk of vibration, noise and core fatigue.

[0049] Furthermore, in some possible embodiments, the columnar frame 4041 is sleeved and fixed to the inner ring of the housing 10 and is open at both axial ends; and The annular piece 4042 protrudes radially inward from the opening edge on one side of the columnar frame 4041; One axial end face of the stator core 20 abuts against and is supported on the surface of the annular plate 4042.

[0050] In this embodiment, the columnar frame 4041 is fixed to the inner ring of the housing 10, and an annular piece 4042 protruding radially inward is provided at the edge of its axial opening, so that the axial end face of the stator core 20 directly abuts against the annular piece 4042. This structure provides a positioning reference for the stator core 20 in the axial direction, and evenly transmits the deformation thrust of the piezoelectric ceramic block 401 to the stator yoke in the radial direction, so as to avoid axial movement or circumferential misalignment of the stator core 20 during deformation, thereby ensuring the synchronization and repeatability of air gap adjustment, while simplifying the assembly process and improving the overall reliability of the machine.

[0051] Furthermore, in some possible implementations, the motor further includes: The power amplifier module 50 is electrically connected to the piezoelectric actuator unit via wire 60, and is used to amplify the voltage signal from the control unit and output it as a controlled voltage.

[0052] Furthermore, in some possible implementations, the power amplification module 50 is used to amplify the micron-level original deformation generated by the air gap adjustment module 40 to the millimeter-level effective deformation.

[0053] In this embodiment, the voltage signal of the control unit is amplified by the power amplifier module 50 through the wire 60 and output as a controlled voltage, so that the piezoelectric actuator obtains a sufficient electric field strength, thereby amplifying the original micron-level deformation of the piezoelectric ceramic block 401 to the millimeter-level effective deformation. This amplification link ensures that sufficient air gap adjustment can be achieved under low voltage control signal, which reduces the design voltage and power consumption of the control unit, and ensures real-time, accurate and large-amplitude adjustment of the radial air gap during motor operation, further suppressing vibration and noise, and improving the dynamic response and operational reliability of the system.

[0054] Furthermore, in some possible implementations, the motor is a servo motor.

[0055] In this embodiment, the servo motor naturally integrates the air gap adjustment module 40 with the servo control closed loop: with the help of the existing high-bandwidth current / speed / position feedback of the servo system, the control unit can obtain the operating status in real time and output the controlled voltage. The piezoelectric actuator then generates radial deformation, which immediately corrects the inner diameter of the stator core 20 or the outer diameter of the rotor core 30. This allows for the continuous maintenance of a uniform air gap under servo conditions of high-speed forward and reverse rotation and frequent acceleration and deceleration, significantly reducing cogging torque pulsation and positioning jitter, improving the torque linearity, response speed and positioning accuracy of the servo motor, while avoiding the disadvantages of traditional servo motors that require additional volume and current margin due to fixed air gap.

[0056] Furthermore, a second aspect of the present application also provides a terminal device, which includes the motor provided in the first aspect of the present application, and an actuator driven by the motor; the terminal device is at least one of an elevator, a crane, textile machinery, an automated production line, or a vehicle.

[0057] The motor in this embodiment is applied to terminal equipment such as elevators, cranes, textile machinery, automated production lines, or vehicles. During operation, these devices can adjust the radial air gap in real time using the radial deformation of the air gap adjustment module 40, thereby effectively suppressing vibration and noise caused by uneven air gaps, reducing iron loss and the risk of rotor rubbing due to excessively small air gaps, and avoiding increasing the size and weight of the motor to compensate for excessively large air gaps. At the same time, by leveraging the high-precision control characteristics of servo motors, the leveling accuracy of elevators, the positioning stability of cranes, the yarn tension consistency of textile machinery, the cycle accuracy of automated production lines, and the energy efficiency and quietness of electric drive systems in vehicles are improved, achieving high-efficiency, energy-saving, low-noise, and long-life operation of the entire equipment.

[0058] In the above embodiments of this application, the descriptions of each embodiment have their own emphasis. Parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments. The steps illustrated in the related flowcharts can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowcharts, in some cases, the steps shown or described may be performed in a different order than that shown here. In other words, the order of steps described in the foregoing embodiments is merely an example. Reasonable adjustments to the order of steps based on the content of the embodiments of this application are also within the protection scope of the embodiments of this application.

[0059] The sequence numbers or order of description of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An electric motor, characterized in that, include: Casing (10); The stator core (20) is fixed inside the housing (10); The rotor core (30) is arranged coaxially with the stator core (20), and a radial air gap is formed between the outer diameter of the rotor core (30) and the inner diameter of the stator core (20). The air gap adjustment module (40) includes at least a piezoelectric actuator, which can generate radial deformation under controlled voltage. The control unit is used to output the controlled voltage according to the operating status of the motor; in The air gap adjustment module (40) is disposed between the housing (10) and the stator core (20) to change the inner diameter of the stator core (20) through the radial deformation, thereby adjusting the radial air gap size in real time. and / or The air gap adjustment module (40) is located between the rotor core (30) and the motor shaft (70) to change the outer diameter of the rotor core (30) through the radial deformation, thereby adjusting the radial air gap size in real time.

2. The motor according to claim 1, characterized in that, The piezoelectric actuator has multiple sets, which are distributed in the circumferential direction of the motor, and each set of piezoelectric actuators extends along the axial direction of the motor.

3. The motor according to claim 2, characterized in that, Each of the piezoelectric actuators includes multiple layers of piezoelectric ceramic blocks (401), which are stacked together from the inside to the outside along the radial direction of the motor. The radial deformation ΔL of the piezoelectric actuator satisfies ΔL = d 33 ·V·N, where d 33 The piezoelectric coefficient is taken as a value between 100 pm / V and 300 pm / V, where V is the controlled voltage and N is the number of layers of the piezoelectric ceramic block (401).

4. The motor according to claim 3, characterized in that, The piezoelectric actuator also includes: A metal film (402) is coated on the surface of the piezoelectric ceramic block (401).

5. The motor according to claim 4, characterized in that, The piezoelectric actuator also includes: A soft metal sheet (403) is attached to the surface of the metal film (402).

6. The motor according to claim 3, characterized in that, The air gap adjustment module (40) also includes: The support frame (404) has one side of the piezoelectric ceramic block (401) fixed to the support frame (404) and the opposite side pressing against the outside of the stator core (20) or the inside of the rotor core (30).

7. The motor according to claim 6, characterized in that, The air gap adjustment module is disposed between the housing (10) and the stator core (20); The outer side of the support frame (404) is fixed to the housing (10), and the inner side is fixed to the piezoelectric ceramic block (401). The inner side of the piezoelectric ceramic block (401) is also stacked with a metal film (402) and a soft metal sheet (403). The soft metal sheet (403) presses against the outside of the stator core (20).

8. The motor according to claim 7, characterized in that, The supporting framework includes: A columnar frame (4041) is fitted and fixed to the inner ring of the housing (10) and is open at both ends axially; and The annular piece (4042) protrudes radially inward from the opening edge on one side of the columnar frame (4041); The axial end face of the stator core (20) abuts against and is supported on the surface of the annular plate (4042).

9. The motor according to any one of claims 1-8, characterized in that, The motor also includes: A power amplifier module (50) is electrically connected to the piezoelectric actuator unit via a wire (60) and is used to amplify the voltage signal from the control unit and output it as the controlled voltage.

10. The motor according to claim 9, characterized in that, The power amplification module (50) is used to amplify the micron-level original deformation generated by the air gap adjustment module (40) to the millimeter-level effective deformation.

11. The motor according to claim 1, characterized in that, The motor is a servo motor.

12. A terminal device, characterized in that, It includes a motor as described in any one of claims 1-11, and an actuator driven by the motor; the terminal equipment is at least one of an elevator, a crane, textile machinery, an automated production line, or a vehicle.

Images