Electric machine rotor, electric machine and method for designing an electric machine rotor

Abstract

The disclosure provides a motor rotor, a motor and a motor rotor design method, and relates to the technical field of motors. The motor rotor comprises a magnetic bridge and a slider assembly. The slider assembly comprises a magnetic-conducting slider adjacent to the magnetic bridge and an elastic member for providing a reset force for the magnetic-conducting slider. The magnetic-conducting slider moves due to the combined action of centrifugal force and the reset force of the elastic member during operation of the motor to cause the width of the magnetic bridge to change. The combination of the elastic coefficient parameter, the compression length parameter of the elastic member and the inclination angle parameter of the magnetic-conducting slider is selected to cause the width of the magnetic bridge to start to increase when the motor speed increases to a first critical speed during the increase of the motor speed, and the width of the magnetic bridge reaches its maximum value when the motor speed increases to a second critical speed. The motor rotor does not require an external adjusting mechanism and medium, and the width of the magnetic bridge is self-adaptively adjusted according to the motor speed.

Description

Technical Field

[0001] This disclosure belongs to the field of motor technology, specifically relating to a motor rotor, a motor, and a motor rotor design method. Background Technology

[0002] High-performance motors need to have good torque output at low speeds and high power output at high speeds. However, in actual motor design and development, to achieve high peak torque, motors are usually required to have high permanent magnet flux linkage. But high permanent magnet flux linkage means that a large field weakening current needs to be applied when the motor enters high-speed conditions, resulting in a rapid decrease in motor output power.

[0003] To ensure good output capability of the motor under both low and high speed conditions, related technologies propose actively adjusting the relative position of the magnetic poles of the rotor and the magnetic adjustment component by regulating the medium in the magnetic adjustment flow path, thereby achieving effective regulation of the motor's working magnetic field. However, this type of solution requires specific adjustment mechanisms, media, and active control strategies, resulting in a complex motor rotor structure and significant control difficulties, making it difficult to widely apply in engineering practice. Summary of the Invention

[0004] This disclosure provides a motor rotor, a motor, and a method for designing a motor rotor, aiming to at least partially solve the technical problems of complex motor rotor structure and high control difficulty caused by related technologies in order to achieve high-performance motors.

[0005] At least one embodiment of this disclosure provides an electric motor rotor, comprising:

[0006] Magnetic bridge, and A slider assembly, the slider assembly including a magnetically guided slider adjacent to the magnetic bridge and an elastic element for providing a restoring force to the magnetically guided slider; The magnetic slider moves during motor operation due to the combined action of centrifugal force and the restoring force of the elastic element, changing its relative position with the magnetic bridge and causing the width of the magnetic bridge to change. The combination of the elastic coefficient parameter, compression length parameter, and tilt angle parameter of the magnetic slider is selected so that, during the process of increasing motor speed, when the motor speed increases to the first critical speed, the width of the magnetic bridge begins to increase, and when the motor speed increases to the second critical speed, the width of the magnetic bridge reaches its maximum value.

[0007] The above solution offers the following technical advantages: It provides a motor rotor with an adaptive magnetic bridge width that changes with motor speed, eliminating the need for external adjustment mechanisms and media. The magnetic bridge width adjusts adaptively with the motor speed. When the motor operates at low speeds below the first critical speed, the smaller magnetic bridge width facilitates high torque output. Conversely, when operating at high speeds above the first critical speed, the magnetic bridge width increases with increasing motor speed, thereby increasing the motor's d-axis inductance, reducing the field weakening current, and enhancing the motor's output power. This method optimizes the response characteristics of the magnetic bridge width to motor speed variations by dynamically adjusting the relative position between the magnetic bridge and the magnetic guide slider. This motor rotor is advantageous for both high torque output at low speeds and high power output at high speeds.

[0008] In the motor rotor provided in at least one embodiment of this disclosure, the first critical speed is related to the inflection point speed on the external characteristic curve of the motor, and the second critical speed is related to the peak speed on the external characteristic curve of the motor.

[0009] The above solution has the following technical advantages: accurately determining the first critical speed and the second critical speed.

[0010] In the motor rotor provided in at least one embodiment of this disclosure, the combination of the elastic coefficient parameter, the compression length parameter of the elastic element, and the tilt angle parameter of the magnetic guide slider is selected to satisfy the following: The first force model of the magnetic guide slider at the second critical speed, wherein the first force model is used to ensure that when the motor speed reaches the second critical speed, the magnetic guide slider is directly facing the magnetic bridge body, and the distance between the center of the magnetic guide slider and the center of the rotating shaft is a preset first distance; and... The second force model of the magnetic slider at the first critical speed is used to make the distance between the center of the magnetic slider and the center of the rotating shaft a preset second distance when the motor speed reaches the first critical speed.

[0011] The above solution has the following technical effects: by optimizing the combined parameters formed by the tilt angle parameter, elastic coefficient parameter and compression length parameter through the first force model of the second critical speed and the second force model of the first critical speed, the optimal data combination is obtained, ensuring that the magnetic bridge width of the designed motor rotor is adaptively adjusted with the motor speed to meet the design requirements.

[0012] In the motor rotor provided in at least one embodiment of this disclosure, the first force model is configured as follows: Based on the input second critical rotational speed and the first distance between the center of the magnetic slider and the center of the rotating shaft when the magnetic slider is in full contact with the magnetic bridge, a first centrifugal force is generated on the magnetic slider. The component of the first centrifugal force in the direction of movement of the magnetic slider is generated based on the first centrifugal force and the tilt angle parameter. Based on the elastic coefficient parameter and the compression length parameter, a first compressive force is generated for the elastic element; and, Based on the fact that the component of the first centrifugal force in the moving direction of the magnetic slider is equal to the first compressive force of the elastic element, a first relationship is determined between the elastic coefficient parameter, the compression length parameter of the elastic element, and the tilt angle parameter of the magnetic slider.

[0013] The above solution has the following technical effects: accurately determining the first relationship that the combined parameters should satisfy when the magnetic slider and the magnetic bridge are in full contact.

[0014] In the motor rotor provided in at least one embodiment of this disclosure, the first force model is further configured as follows: The first distance is determined based on the fact that the first centrifugal force is greater than a set multiple of the weight of the magnetic slider.

[0015] The above solution has the following technical effects: it accurately determines the first distance and further limits the first relationship that the combined parameters should satisfy when the magnetic slider and the magnetic bridge are in full contact.

[0016] In the motor rotor provided in at least one embodiment of this disclosure, the second force model is configured as follows: Based on the input first critical rotational speed and the second distance between the center of the magnetic slider and the center of the rotating shaft when the magnetic slider begins to contact the magnetic bridge, a second centrifugal force is generated for the magnetic slider; The component of the second centrifugal force in the direction of movement of the magnetic slider is generated based on the second centrifugal force and the tilt angle parameter; Based on the elastic coefficient parameter and the compression length parameter, a second compressive force is generated for the elastic element; and, Based on the fact that the component of the second centrifugal force in the moving direction of the magnetic slider is equal to the second compressive force of the elastic element, a second relationship is determined between the elastic coefficient parameter, the compression length parameter of the elastic element, and the tilt angle parameter of the magnetic slider.

[0017] The above solution has the following technical effect: accurately determining the second relationship that the combined parameters should satisfy when the magnetic slider and the magnetic bridge begin to contact.

[0018] In the motor rotor provided in at least one embodiment of this disclosure, the second force model is further configured as follows: The second distance is determined based on the first distance and the pre-set geometric relationship between the first distance and the second distance; Furthermore, the motor rotor also includes a limiting mechanism, which is used to prevent the magnetic slider from deviating from the set movement trajectory; The tilt angle parameter of the magnetic guide slider satisfies the set motion geometry relationship so that the magnetic guide slider maintains a relative positional relationship with the magnetic bridge along a set movement trajectory during the movement process.

[0019] The above solution has the following technical effects: it accurately determines the second distance and further limits the second relationship that the combined parameters should satisfy when the magnetic slider and the magnetic bridge begin to contact. By satisfying the set motion geometry relationship through the limiting mechanism and tilt angle parameters, it ensures that the magnetic slider maintains the relative positional relationship with the magnetic bridge along the set movement trajectory during the movement.

[0020] At least one embodiment of this disclosure provides a method for designing a motor rotor, including: A first critical speed and a second critical speed that cause the magnetic bridge width to change are determined, wherein, during the process of increasing motor speed, when the motor speed increases to the first critical speed, the magnetic bridge width begins to increase, and when the motor speed increases to the second critical speed, the magnetic bridge width reaches its maximum value; The second critical speed is input into the first force model of the magnetic slider at the second critical speed to obtain the first relationship between the elastic coefficient parameter, the compression length parameter and the tilt angle parameter of the magnetic slider of the elastic element; The first critical speed is input into the second force model of the magnetic slider at the first critical speed to obtain the second relationship between the elastic coefficient parameter, the compression length parameter and the tilt angle parameter of the magnetic slider of the elastic element; Obtain an optimal data combination of the tilt angle parameter, the elastic coefficient parameter, and the compression length parameter that simultaneously satisfies both the first and second relationships; and, The motor rotor designed based on the preferred data combination includes a magnetic bridge and a slider assembly. The slider assembly includes a magnetically guided slider adjacent to the magnetic bridge and an elastic element for providing a restoring force to the magnetically guided slider. When the motor is running, the magnetically guided slider moves due to the combined action of centrifugal force and the restoring force of the elastic element, causing the width of the magnetic bridge to change.

[0021] The above solution offers the following technical advantages: It provides a design method for a high-speed, high-power motor with an adaptive magnetic bridge width that changes with motor speed, eliminating the need for external adjustment mechanisms and media. The magnetic bridge width adjusts adaptively with the motor speed. When the motor operates at low speeds below the first critical speed, the smaller magnetic bridge width facilitates high torque output. Conversely, when operating at high speeds above the first critical speed, the magnetic bridge width increases with increasing motor speed, thereby increasing the motor's d-axis inductance, reducing the field weakening current, and enhancing the motor's output power. This method optimizes the response characteristics of the magnetic bridge width to changes in motor speed by dynamically adjusting the relative position between the magnetic bridge and the magnetic guide slider. This approach benefits both the motor's ability to output high torque at low speeds and its ability to achieve high power at high speeds.

[0022] In at least one embodiment of the method provided in this disclosure, determining the first critical speed and the second critical speed that cause the magnetic bridge width to change includes: Obtain the inflection point speed and peak speed on the external characteristic curve of the motor; The first critical speed is generated based on the inflection point speed; and... The second critical speed is generated based on the peak speed; Furthermore, obtaining the preferred data combination of the tilt angle parameter, the elastic coefficient parameter, and the compression length parameter that simultaneously satisfies the first relationship and the second relationship includes: Select multiple values ​​for the tilt angle parameter within its set range; For each value of the tilt angle parameter, the specific values ​​of the corresponding elastic coefficient parameter and compression length parameter are determined based on the first relationship and the second relationship, thereby determining multiple combinations of the tilt angle parameter, the elastic coefficient parameter, and the compression length parameter; and, Verify each combination of the tilt angle parameter, the elastic coefficient parameter, and the compression length parameter under pre-set constraints to obtain an optimal data combination of the tilt angle parameter, the elastic coefficient parameter, and the compression length parameter, such that when the motor speed reaches the second critical speed, the magnetic guide slider is directly facing the magnetic bridge body and the distance between the center of the magnetic guide slider and the center of the rotating shaft is the first distance, and when the motor speed reaches the first critical speed, the distance between the center of the magnetic guide slider and the center of the rotating shaft is the second distance. The method also includes: Obtain a motor model containing the designed motor rotor; Verify whether the motor model satisfies: When the motor speed exceeds the second critical speed, the magnetic guide slider and the magnetic bridge are always in the first relative position where the magnetic guide slider is directly opposite the magnetic bridge body, and the width of the magnetic bridge is greater than its initial width. When the motor speed is less than the first critical speed, the magnetic slider and the magnetic bridge are always in a second relative position different from the first relative position, and the width of the magnetic bridge is its initial width. When the motor speed is greater than the first critical speed and less than the second critical speed, the magnetic slider moves continuously between the first relative position and the second relative position with the motor speed to achieve adaptive adjustment of the magnetic bridge width. If so, generate first information to characterize that the motor rotor meets the design requirements; and, If not, generate second information to characterize that the motor rotor does not meet the design requirements.

[0023] The above solution has the following technical effects: it ensures that the magnetic bridge width of the designed motor rotor is adaptively adjusted with the motor speed to meet the design requirements.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of an example motor rotor provided in at least one embodiment of this disclosure; Figure 2 A schematic diagram of the movement path of the magnetic slider provided in at least one embodiment of this disclosure; Figure 3 A flowchart of a motor rotor design method provided in at least one embodiment of this disclosure; Figure 4 Flowchart of a scheme for determining a first critical speed and a second critical speed provided for at least one embodiment of this disclosure; Figure 5 A flowchart of a first force model provided for at least one embodiment of this disclosure; Figure 6 A flowchart of a second force model provided for at least one embodiment of this disclosure; picture Flowchart of the combined parameter optimization scheme; Figure 8 A structural block diagram of a motor provided in at least one embodiment of this disclosure; Figure 9 A schematic diagram illustrating the composition of a program product provided for at least one embodiment of this disclosure.

[0027] Figure label: 100 - Magnetic bridge; 200 - Slider assembly; 201 - Magnetic guide slider; 202 - Elastic element; 101 - Magnet slot; 102 - Magnet; 10 - Motor; 11 - Motor stator; 12 - Motor rotor; 21 - Processor; 22 - Memory; 23 - Input device; 24 - Output device; O - Shaft center; L 0 - Width of the main body of the magnetic bridge; k - Elasticity coefficient parameter; L 2- Compression length parameter; θ - Tilt angle parameters; Points A, B, C; r 1- The first distance between the center of the magnetic slider and the center of the rotating shaft when the magnetic slider is in full contact with the magnetic bridge; r 2- The second distance between the center of the magnetic slider and the center of the rotating shaft when the magnetic slider and the magnetic bridge begin to make contact. Detailed Implementation

[0028] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the disclosure. Similarly, the following embodiments are only some, not all, embodiments of the present disclosure, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0029] The terms "first," "second," and "third" used in the embodiments of this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," and "third" may explicitly or implicitly include at least one of that feature.

[0030] In the description of this disclosure, "multiple" means at least two, such as two or three, unless otherwise expressly and specifically limited.

[0031] In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] The terms “comprising” and “having”, and any variations thereof, used in this disclosure are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to such processes, methods, products, or devices.

[0033] In the embodiments of this disclosure, the term "magnetic bridge" refers to the structure on the motor rotor used to connect magnets, which provides strength and magnetic shielding.

[0034] In the embodiments of this disclosure, the term "magnetic bridge width" refers to the effective width dimension of the magnetic bridge on the motor rotor.

[0035] In this disclosure, the term "magnetic bridge body width" refers to the minimum width of the rotor core bridging between magnets.

[0036] In this disclosure, the term "inflection point" refers to the speed point on the external characteristic curve of the motor where the peak torque begins to decrease.

[0037] In the embodiments of this disclosure, the term "rotor shaft center" refers to the geometric center of the motor rotor shaft, which is the reference center point for the rotational motion of the motor rotor and the origin point for the spatial position and dimension reference of each component in the rotor structure design.

[0038] Figure 1 A schematic diagram of the structure of an example motor rotor provided for at least one embodiment of this disclosure. (See attached diagram.) Figure 1 As shown, the motor rotor includes a magnetic bridge 100 and a slider assembly 200. The slider assembly 200 further includes a magnetically guided slider 201 adjacent to the magnetic bridge and an elastic member 202 for providing a restoring force to the magnetically guided slider 201.

[0039] When the motor is running, the magnetic slider 201 moves due to the combined action of centrifugal force and the restoring force of the elastic element, causing a change in the width of the magnetic bridge and its relative position to the magnetic bridge 100. The magnetic slider 201 may move, but is not limited to, along a direction that is at a fixed angle to the horizontal.

[0040] The combination of the elastic coefficient parameter, compression length parameter, and tilt angle parameter of the elastic element 202 and the magnetic slider 201 is selected so that when the motor speed increases to the first critical speed, the magnetic bridge width begins to increase, and when the motor speed increases to the second critical speed, the magnetic bridge width reaches its maximum value, thereby realizing the adaptive adjustment of the magnetic bridge width with the motor speed.

[0041] The above-described scheme does not impose any limitations on the configuration of the magnetic bridge 100. In practical applications, in addition to the schemes mentioned later, the magnetic bridge 100 can adopt a multi-layer composite structure, consisting of alternating layers of magnetic and non-magnetic materials, with the magnetic reluctance characteristics optimized by adjusting the thickness ratio of each layer; alternatively, its cross-sectional shape can be designed as a trapezoidal, arc-shaped, or other non-rectangular structure to adapt to the magnetic flux variation requirements at different speeds; furthermore, several grooves or protrusions can be provided on the surface of the magnetic bridge 100 to enhance the magnetic coupling effect with the magnetic slider 201 and improve the sensitivity of the magnetic bridge width adjustment. These different configurations can all meet the core requirement of adaptive adjustment of the magnetic bridge width with speed, and can be flexibly selected according to the actual application scenario of the motor, such as power level and speed range.

[0042] In the above-described scheme, this disclosure does not impose any restrictions on the structure of the slider assembly 200 except for the magnetic slider 201 and the elastic element 202. The motor rotor may also include a limiting mechanism to prevent the magnetic slider 201 from deviating from the set movement trajectory. In addition, the slider assembly 200 may also include a lubrication structure, such as coating the mating surface between the magnetic slider 201 and the rotor body with a self-lubricating coating such as polytetrafluoroethylene, or embedding solid lubrication units such as graphite or molybdenum disulfide, to reduce frictional losses during slider movement and ensure that it can quickly respond to changes in the elastic force of the elastic element 202 during speed changes; a position feedback module may also be added to collect the displacement data of the magnetic slider 201 in real time through a miniature Hall sensor and feed it back to the control system for coordinated processing with the motor speed signal to achieve closed-loop adjustment of the magnetic bridge width, further improving the accuracy and stability of adaptive adjustment. These structural optimizations are all aimed at enhancing the working reliability of the slider assembly 200 and better serving the core objective of adaptive adjustment of the magnetic bridge width with speed, and can be flexibly configured according to the specific design requirements of the motor.

[0043] In the above scheme, when designing the motor rotor, the first critical speed point B and the second critical speed point C for increasing the magnetic bridge width are clearly defined according to the motor's requirements, such as... Figures 1-2As shown, when the magnetic slider 201 moves to the first critical speed point B, the width of the magnetic bridge just begins to increase. The first critical speed can be used to select the inflection point speed of the motor. When the magnetic slider 201 moves to the second critical speed point C, the width of the magnetic bridge increases to its maximum value. The second critical speed point can be used to select the peak speed of the motor. The inflection point speed usually corresponds to the turning point where the motor output torque changes from constant to decreasing as the speed increases. It reflects the coupling change node of the motor's electromagnetic and mechanical characteristics. The peak speed is the operating speed at which the motor output power reaches its maximum value and is one of the key indicators of the motor's performance limits.

[0044] By optimizing the combined parameters formed by the elastic coefficient parameter of the elastic element 202, the compression length parameter of the elastic element 202, and the tilt angle parameter of the magnetic slider 201, the first critical speed point and the second critical speed point of the motor can be precisely matched. This ensures that the width of the magnetic bridge begins to increase precisely when the motor reaches the first critical speed point and reaches its maximum value at the second critical speed point. This achieves adaptive adjustment of the magnetic bridge width with the motor speed, optimizing the motor's operating performance in different speed ranges.

[0045] Through the dynamic balance mechanism between the pre-compression of the elastic element 202 and the centrifugal force, the width of the magnetic bridge is maintained at its original main body width under low-speed conditions (motor speed below the first critical speed). L This increases the torque density of the motor. When the motor speed increases to the first critical speed and continues to increase, the magnetic slider 201 generates radial displacement under the action of centrifugal force, causing the magnetic bridge width to increase, thereby suppressing iron loss in the high-speed weak magnetic region. This mechanism achieves continuous adaptive adjustment of the magnetic bridge width within the speed range from the first critical speed to the second critical speed, ultimately reducing the peak iron loss of the motor by 15% to 20%, while extending the peak power duration by 30%.

[0046] In some embodiments, such as Figure 1 As shown, magnet 102 is installed inside magnet slot 101, and magnet 102 itself constitutes a magnetic pole. Magnetic bridge 100 is located between two adjacent magnet slots 101 and is the iron core connecting them. The mass of the magnetic guide slider... m Tilt angle parameter θ The magnetic slider 201 is equipped with a spring, with an elastic coefficient parameter of... k Length in its natural state L 1. Compression length parameter L 2. The rotor structure of this motor is well lubricated, and friction is negligible.

[0047] The magnetic slider 201 is made of magnetic material, and its quantity is unlimited. Each magnetic slider 201 can be installed in various ways, such as by tilting. Figure 1 Only the magnetic slider 201 is shown in the figure, which has a fixed tilt angle with the horizontal direction. θThe magnetic slider 201 moves in the direction of rotation. The number of magnetic sliders 201 can be flexibly set according to the motor's power rating, target speed range, and magnetic bridge width adjustment requirements. When multiple magnetic sliders 201 are used, they are usually evenly distributed along the rotor circumference to ensure dynamic balance performance during rotor operation. When arranged at an angle, the tilt angle is... θ The design can be optimized by combining the direction of centrifugal force with the adjustment threshold of the magnetic bridge width, so that the magnetic guide slider 201 can move smoothly along a preset path when the motor speed changes. In addition to the inclined arrangement, radial or circumferential arrangements can also be used. The radially arranged magnetic guide slider 201 mainly moves along the rotor radius, which is suitable for scenarios with high sensitivity requirements for magnetic bridge width adjustment. The circumferentially arranged magnetic guide slider 201 changes the effective magnetic guiding area of ​​the magnetic bridge by circumferential movement to adapt to the magnetic field adjustment requirements under different operating conditions.

[0048] In some embodiments, Figure 1 Based on the proposed solution, the elastic element 202 can be, but is not limited to, a spring, with the elastic coefficient parameter... k Length in its natural state L 1. Compression length parameter L 2. The installation position of the elastic element 202 should match the arrangement of the magnetic slider 201. For example, for a radially arranged slider, the elastic element should be set radially, while for an inclined magnetic slider 201, the installation angle of the elastic element should be adjusted so that the direction of the elastic force is consistent with the movement path of the slider.

[0049] exist Figure 1 Based on the scheme, the motor rotor also includes a limiting mechanism for restricting the movement range of the magnetic slider 201. The limiting mechanism can be set on the rotor core to prevent the magnetic slider 201 from deviating from the set movement trajectory.

[0050] In some embodiments, Figure 1 Based on the proposed scheme, the combination of the elastic coefficient parameter, compression length parameter, and tilt angle parameter of the elastic element 202 is selected to satisfy both the first force model and the second force model of the magnetic slider 201 at the second critical speed. The first force model ensures that when the motor speed reaches the second critical speed, the magnetic slider 201 is directly opposite the magnetic bridge body, and the distance between the center of the magnetic slider 201 and the center of the shaft is a preset first distance. The second force model ensures that when the motor speed reaches the first critical speed, the distance between the center of the magnetic slider 201 and the center of the shaft is a preset second distance. Through the constraints of these two force models, a quantitative correlation can be established between the elastic coefficient parameter, compression length parameter, and tilt angle parameter, providing a theoretical basis for subsequent parameter optimization.

[0051] For the specific design of the first force model and the second force model in the above scheme, please refer to the description of the motor rotor design method embodiment below.

[0052] In some embodiments, Figure 1 Based on the scheme, the tilt angle parameter of the magnetic guide slider 201 satisfies the set motion geometry relationship so that the magnetic guide slider 201 maintains the relative positional relationship with the magnetic bridge 100 on the set movement trajectory during the movement.

[0053] As an exemplary implementation, the setting of the motion geometry relationship can be:

[0054] In the formula, θ Indicates the tilt angle parameter. L 0 indicates the width of the magnetic bridge body. r 1 represents the first distance between the center of the magnetic slider and the center of the rotating shaft.

[0055] For the derivation process, please refer to the specific motor design method examples below.

[0056] Figure 3 A flowchart illustrating a motor rotor design method provided for at least one embodiment of this disclosure. This method can be applied to, but is not limited to, [various applications]. Figures 1-2 The motor rotor is shown. (As shown) Figure 3 As shown, the method may include the following steps S10-S40.

[0057] Step S10: Determine the first critical speed and the second critical speed that cause the magnetic bridge width to change, wherein, during the process of increasing the motor speed, when the motor speed increases to the first critical speed, the magnetic bridge width begins to increase, and when the motor speed increases to the second critical speed, the magnetic bridge width reaches its maximum value.

[0058] Step S20: Input the second critical speed into the first force model of the magnetic slider at the second critical speed, and obtain the first relationship between the elastic coefficient parameter, compression length parameter and tilt angle parameter of the elastic element.

[0059] Step S30: Input the first critical speed into the second force model of the magnetic slider at the first critical speed, and obtain the second relationship between the elastic coefficient parameter, compression length parameter and tilt angle parameter of the elastic element.

[0060] Step S40: Obtain the preferred data combination of tilt angle parameter, elastic coefficient parameter and compression length parameter that simultaneously satisfies the first relationship and the second relationship.

[0061] Step S50: Generate the designed motor rotor based on the preferred data combination.

[0062] It should be noted that the magnetic slider in the motor rotor obtained by this method includes, but is not limited to, an inclined setting. The centrifugal force of the magnetic slider caused by rotation is used to change its position, thereby altering the magnetic bridge width and optimizing its speed response characteristics. Through the combined parameter design of the elastic coefficient and compression length parameters of the elastic element, high torque output is achieved at low speeds, while effectively improving power performance at high speeds.

[0063] In the above scheme, this disclosure does not limit the method for determining the first critical speed and the second critical speed in step S10. In practical application scenarios, in addition to the inflection point speed and peak speed on the external characteristic curve mentioned later, they can also be set according to the design target operating conditions of the motor. For example, the lower limit of the target speed range corresponding to the low speed and high torque output requirement can be set as the first critical speed, and the upper limit of the target speed range corresponding to the high speed power performance optimization requirement can be set as the second critical speed. Alternatively, the critical speed can be selected as the key dividing point of the rated speed range in combination with the rated operating range of the motor. In addition, the dynamic response characteristics of the motor rotor can be simulated by finite element simulation to obtain its resonance speed point and use it as a reference for the critical speed. Or, based on the actual operating requirements of specific application scenarios, such as the speed corresponding to the starting acceleration stage and the speed corresponding to the high-speed cruising stage of an electric vehicle, the first critical speed and the second critical speed can be determined respectively.

[0064] When the system executes step S10, it can select a suitable first critical speed and second critical speed to determine the scheme based on the specific actual working conditions.

[0065] In the above scheme, this disclosure does not limit the first force model in step S20. The first force model is configured to generate a first relationship between the elastic coefficient parameter, compression length parameter, and tilt angle parameter of the magnetic slider based on the input second critical speed. In practical applications, in addition to the scheme mentioned later, a composite force model considering the coupling effect of centrifugal force and electromagnetic force can be constructed according to the material properties, structural dimensions, and actual load conditions of the motor rotor. This model can accurately simulate the stress distribution and deformation state of the rotor at different critical speeds; or, to address the aerodynamic drag effect in high-speed operation scenarios, a modified force model incorporating aerodynamic effects can be introduced to improve the accuracy and reliability of the design. These different force models can be flexibly selected according to specific design goals to better adapt to the performance requirements of the motor under various operating conditions.

[0066] When the system executes step S20, it can select a suitable first force model according to the specific actual working conditions.

[0067] In the above scheme, this disclosure does not limit the second force model in step S30. The second force model is configured to generate a second relationship between the elastic coefficient parameter, compression length parameter, and tilt angle parameter of the magnetic slider based on the input first critical speed. In practical application scenarios, in addition to the scheme described in the following embodiments, different types of second force models can be constructed according to the operating conditions of the motor rotor. For example, for the friction damping effect in low-speed heavy-load scenarios, a force model including the contact friction between the elastic element and the magnetic slider can be established. This model can accurately calculate the influence of friction on the relationship between the elastic coefficient, compression length, and tilt angle parameters; or, considering the influence of material thermal deformation under extreme temperature environments, a thermal compensation type second force model can be introduced, combining the thermal expansion coefficient and temperature field distribution of the rotor material to correct the deviation of elastic parameters caused by temperature changes. These different second force models can be flexibly selected according to specific design goals such as vibration suppression and efficiency optimization, thereby further improving the operating stability and design accuracy of the motor rotor under complex operating conditions.

[0068] When the system executes step S30, it can select a suitable second force model according to the specific actual working conditions.

[0069] In the above scheme, this disclosure does not limit the combination parameter optimization scheme in step S40. In practical application scenarios, in addition to the schemes described in the following embodiments, different combination parameter optimization strategies can be adopted according to the actual operating requirements and performance indicators of the motor rotor. For example, for scenarios that pursue high dynamic response, a multi-objective optimization scheme based on particle swarm optimization algorithm can be adopted to simultaneously optimize the stiffness of elastic components, the clearance of magnetic sliders, and rotor balance parameters to achieve the optimal balance between response speed and operational stability. For applications that emphasize long-term reliability, a robust optimization model based on genetic algorithm can be introduced to consider the influence of material fatigue characteristics and operating condition fluctuations, and select a combination scheme that is not sensitive to parameter deviations to ensure stable operation of the rotor throughout its entire life cycle.

[0070] When the system executes step S40, it can flexibly select an appropriate combination of parameters optimization scheme according to the complexity of the actual working conditions.

[0071] In the above scheme, this disclosure does not limit the motor rotor generation scheme based on the preferred data combination in step S50. For example, the preferred data combination corresponding to the aforementioned combination parameters can be combined to call a preset motor rotor 3D modeling software, and the rotor structure model that meets the performance indicators can be automatically generated according to the mechanical constraints of the second force model. During the generation process, it is also possible to simultaneously verify whether the model meets the relevant limitations in the claims regarding rotor balance, material fatigue characteristics, and working condition adaptability, to ensure the compliance and engineering feasibility of the scheme. In addition, the generation scheme can also support the fine-tuning of parameters of key rotor components (such as elastic elements, magnetic sliders, etc.) according to actual needs, to adapt to the performance requirements of different application scenarios.

[0072] When the system executes step S50, it can select a suitable motor rotor generation scheme based on the optimal data combination according to the specific actual working conditions.

[0073] Some embodiments of this disclosure also provide motor rotors, motors, and program products corresponding to the methods described above.

[0074] The method provided in at least one embodiment of this disclosure is applicable to any existing motor application scenario. For example, in the design of drive motor rotors for new energy vehicles, this method can optimize the rotor magnetic circuit structure to improve the power density and efficiency of the motor; in the design of servo motor rotors in the field of industrial automation, this method can accurately control the dynamic response characteristics of the rotor to meet high-precision positioning requirements; and in the design of permanent magnet motor rotors in household appliances such as air conditioners and washing machines, this method can reduce manufacturing costs while ensuring motor performance and adapt to different operating conditions of household appliances. In addition, in the design of generator rotors for wind power generation, this method can also optimize the fatigue resistance and energy conversion efficiency of the rotor for complex wind farm conditions, helping to improve the overall stability of the wind power generation system.

[0075] Figure 4 A flowchart illustrating a scheme for determining a first critical speed and a second critical speed, provided for at least one embodiment of this disclosure. Figure 3 Based on the proposed scheme, in order to accurately obtain the first and second critical speeds, such as Figure 4 As shown, step S10 further includes the following sub-steps S101-S103.

[0076] Sub-step S101: Obtain the inflection point speed and peak speed on the external characteristic curve of the motor.

[0077] Sub-step S102: Generate the first critical speed based on the inflection point speed.

[0078] Sub-step S103: Generate the second critical speed based on the peak speed.

[0079] In sub-step S101, the external characteristic curve of the motor can be obtained through actual measurement using a motor bench test or through electromagnetic-mechanical joint simulation calculation using motor simulation software. In sub-step S102, the first critical speed generation scheme, in addition to the scheme used in later embodiments, can also incorporate the rotor's structural stiffness characteristics, introduce a safety factor, and multiply the inflection point speed by this safety factor to obtain the first critical speed threshold that can effectively avoid rotor resonance during torque conversion. In sub-step S103, the second critical speed generation scheme, in addition to the scheme used in later embodiments, is based on the peak speed and the rotor's modal analysis results. It matches and corrects the peak speed with the rotor's second-order natural frequency, and then fine-tunes it according to the load fluctuations under actual operating conditions to ensure the dynamic stability of the rotor in the high-power operating range.

[0080] In the above scheme, the first critical speed at which the magnetic bridge width increases is, i.e. Figures 1-2 The rotational speed at which the left boundary of the central guide magnetic slider just contacts the magnetic bridge corresponds to the motor's external characteristic curve. After the inflection point, the magnetic bridge width needs to be increased. Here, the first critical speed is taken as equal to the inflection point speed, which is an example of the first critical speed. The motor's peak speed is the highest speed at which the motor can operate, and it is an example of the second critical speed.

[0081] Figure 5 A flowchart illustrating a first force model provided for at least one embodiment of this disclosure. Figure 3 or Figure 4 Based on the scheme, in order to accurately obtain the primary relationship between the combined parameters, such as Figure 5 As shown, the first force model in step S20 is configured to perform the following sub-steps S201-S204.

[0082] Sub-step S201: Based on the input second critical rotational speed and the first distance between the center of the magnetic slider and the center of the rotating shaft when the magnetic slider is in full contact with the magnetic bridge, generate the first centrifugal force of the magnetic slider.

[0083] Sub-step S202: Generate the component of the first centrifugal force in the direction of movement of the magnetic slider based on the first centrifugal force and tilt angle parameters.

[0084] Sub-step S203: Based on the elastic coefficient parameter and the compression length parameter, generate the first compressive force of the elastic element.

[0085] Sub-step S204: Determine the first relationship based on the fact that the component of the first centrifugal force in the moving direction of the magnetic slider is equal to the first compressive force of the elastic element.

[0086] Sub-steps S201-S204 establish the first set of quantitative relationships between the tilt angle parameter of the magnetic slider, the elastic coefficient parameter of the elastic element, and the compression length parameter of the elastic element. This provides a key theoretical calculation basis for the subsequent optimization and selection of combined parameters, ensuring that the contact state between the magnetic slider and the magnetic bridge meets the design expectations at the second critical speed, and improving the stability and reliability of the motor rotor operation.

[0087] As an exemplary implementation, the first relationship is configured as follows:

[0088] In the formula, k Represents the elastic coefficient parameter. L 2 indicates the compression length parameter. θ Indicates the tilt angle parameter. L 1 represents the natural length of the elastic element. r 1 represents the first distance between the center of the magnetic slider and the center of the rotating shaft when the magnetic slider and the magnetic bridge are in full contact (also known as the centrifugal radius of the slider). m This indicates the mass of the magnetic slider. n 2 indicates the second critical speed.

[0089] First centrifugal force F 1L for:

[0090] The component of the first centrifugal force in the direction of movement of the magnetic slider is: F 1L ×sin θ .

[0091] First compressive force F 1Y for:

[0092] In some embodiments, Figure 5 Based on the scheme, in order to ensure the motor performance at the second critical speed, the first force model is also configured to perform the following sub-step S200.

[0093] Sub-step S200: Determine the first distance based on the set multiple by which the first centrifugal force is greater than the weight of the magnetic slider.

[0094] Sub-step S200 includes, but is not limited to, being set before sub-step S201. When the first centrifugal force is greater than a set multiple of the magnetic slider's own weight, the centrifugal force of the magnetic slider is much greater than its own weight. The influence of the magnetic slider's weight is ignored, thereby ensuring that the magnetic slider can overcome its own weight and work stably at the second critical speed. This avoids poor contact or positional displacement between the magnetic slider and the magnetic bridge due to the influence of gravity, ensuring that the dynamic performance of the motor rotor meets the design requirements.

[0095] As an exemplary implementation method, the first distance r Option 1 must satisfy:

[0096] In the formula, g This is the acceleration due to gravity.

[0097] Figure 6 A flowchart illustrating a second force model provided for at least one embodiment of this disclosure. Figures 3-5 Based on any one of the schemes, in order to accurately obtain the second relationship between the combined parameters, such as Figure 6 As shown, the second force model in step S30 is configured to perform the following sub-steps S301-S304.

[0098] Sub-step S301: Based on the input first critical rotational speed and the second distance between the center of the magnetic slider and the center of the rotating shaft when the magnetic slider and the magnetic bridge begin to contact, generate the second centrifugal force of the magnetic slider.

[0099] Sub-step S302: Generate the component of the second centrifugal force in the direction of movement of the magnetic slider based on the second centrifugal force and tilt angle parameters.

[0100] Sub-step S303: Based on the elastic coefficient parameter and the compression length parameter, generate the second compressive force of the elastic element.

[0101] Sub-step S304: Determine the second relationship based on the fact that the component of the second centrifugal force in the moving direction of the magnetic slider is equal to the second compressive force of the elastic element.

[0102] Through this second relationship, a quantitative correlation between the combined parameters can be established, providing a theoretical basis for the subsequent optimization design of the combined parameters, ensuring that the force on the magnetic slider of the motor rotor is in a balanced state under the first critical speed condition, thereby ensuring the stable operation of the rotor system.

[0103] As an exemplary implementation, the second relationship is configured as follows:

[0104] In the formula, L 0 indicates the width of the magnetic bridge body.r 2 represents the second distance between the center of the magnetic slider and the center of the rotation shaft when the magnetic slider and the magnetic bridge begin to make contact. n 1 indicates the first Critical speed.

[0105] Second centrifugal force F 2L for:

[0106] The component of the second centrifugal force in the direction of movement of the magnetic slider is: F 2L ×sin θ .

[0107] Second compression force F 2Y for: , In some embodiments, Figure 6 Based on the scheme, in order to accurately obtain the second distance, the second force model is also configured to perform the following sub-step S300.

[0108] Sub-step S300: Determine the second distance based on the first distance and the pre-set geometric relationship between the first distance and the second distance.

[0109] Sub-step S300 can be set before sub-step S301. Sub-step S300 allows for the rapid and accurate determination of the specific value of the second distance, laying a crucial parameter foundation for calculating the second centrifugal force F2L and its component in the direction of the magnetic slider's movement in subsequent sub-step S301, ensuring the accuracy of the force analysis. This pre-set geometric relationship can be predetermined based on the structural characteristics of the motor rotor (such as the arrangement of the magnetic bridge and the initial installation position of the magnetic slider) through geometric derivation or CAD modeling. The specific expression needs to be adapted and adjusted according to the actual rotor's structural parameters to ensure that the calculated result of the second distance is consistent with the actual working conditions.

[0110] Figure 7 A flowchart illustrating a combined parameter optimization scheme provided for at least one embodiment of this disclosure. Figures 3-6 Based on any one of the schemes, in order to accurately obtain the optimal combination of combined parameters, such as Figure 7 As shown, step S40 further includes the following sub-steps S401-S403.

[0111] Sub-step S401: Select multiple values ​​for the tilt angle parameter within its set range.

[0112] Sub-step S402: For each value of the tilt angle parameter, determine the specific values ​​of the corresponding elastic coefficient parameter and compression length parameter based on the first relationship and the second relationship, so as to determine multiple combinations of the tilt angle parameter, elastic coefficient parameter and compression length parameter.

[0113] Sub-step S403: Verify the pre-set constraints for each combination of tilt angle parameter, elastic coefficient parameter and compression length parameter, and obtain the optimal data combination of tilt angle parameter, elastic coefficient parameter and compression length parameter, so that when the motor speed reaches the second critical speed, the magnetic slider is directly facing the magnetic bridge body and the distance between the center of the magnetic slider and the center of the rotating shaft is the first distance, and when the motor speed reaches the first critical speed, the distance between the center of the magnetic slider and the center of the rotating shaft is the second distance.

[0114] The preferred data combination determined through sub-steps S401-S403 lays a crucial foundation for finally determining the specific structural parameters of the motor rotor.

[0115] In some embodiments, Figures 3-7 Based on any of the proposed solutions, in order to verify the designed motor rotor, the method further includes the following steps S60-S90.

[0116] Step S60: Obtain a motor model containing the designed motor rotor.

[0117] Step S70: Verify whether the motor model satisfies the following: when the motor speed is greater than the second critical speed, the magnetic guide slider and the magnetic bridge are always in the first relative position where the magnetic guide slider is directly opposite the magnetic bridge body, and the width of the magnetic bridge is greater than its initial width; and when the motor speed is less than the first critical speed, the magnetic guide slider and the magnetic bridge are always in a second relative position different from the first relative position, and the width of the magnetic bridge is its initial width; and when the motor speed is greater than the first critical speed and less than the second critical speed, the magnetic guide slider moves continuously between the first relative position and the second relative position with the motor speed to achieve adaptive adjustment of the magnetic bridge width.

[0118] Step S80: If so, generate first information to characterize that the motor rotor meets the design requirements.

[0119] Step S90: If not, generate second information to characterize that the motor rotor does not meet the design requirements.

[0120] Steps S60-S90 can be placed after step S50. Steps S60-S90 effectively verify whether the adaptive adjustment mechanism of the motor rotor's magnetic bridge width meets design expectations, ensuring that it can stably achieve the preset relative position change of the magnetic guide slider and the magnetic bridge, as well as the adjustment of the magnetic bridge width, within different speed ranges. This guarantees the motor's efficient operation and performance stability over a wide speed range. If second information is generated, it is necessary to return to the motor rotor's structural parameter design stage, readjusting and iteratively optimizing the values ​​of the combined parameters until the motor model passes the verification of steps S60-S90 and meets the design requirements. This verification step is an indispensable part of the motor rotor design process, providing crucial performance evidence for ultimately determining the optimal rotor structure and ensuring the feasibility and reliability of the design scheme.

[0121] In some embodiments, Figures 3-7 In order to further improve the motor performance, based on any of the schemes, the method also includes the following step S41.

[0122] Step S41: Perform pre-set motor performance verification on the preferred tilt angle of the magnetic slider, the preferred elastic coefficient of the elastic element, and the preferred tensile length of the elastic element to ensure that the preferred motor rotor meets the set motor performance requirements.

[0123] Step S41 can be placed between steps S40 and S50. Step S41 simulates the motor's operating state under different conditions, detecting whether the parameter combination of the magnetic slider and elastic component can maintain stable torque output, low torque fluctuation, and high energy conversion efficiency within the target speed range—key performance indicators. If the verification passes, the process can proceed smoothly to the subsequent design phase in step S50; if the verification fails to meet the requirements, the process must return to the parameter optimization stage, readjust the values ​​of each parameter, and perform performance verification again until all indicators meet the design standards. This pre-verification step effectively avoids performance defects caused by unreasonable parameters of key components in subsequent stages, providing accurate parameter basis for the optimized design of the overall motor rotor structure.

[0124] The following is an example of a specific motor design method. This example method includes the following steps: 1) Based on the electromagnetic scheme and external characteristic curve of the motor, the inflection point speed of the motor is... n 1. Peak speed n 2. Width of the main body of the magnetic bridge L 0, the mass m of the magnetic slider, and the tilt angle parameter. θ The magnetic slider is equipped with a spring, with an elastic coefficient parameter of... k Length in its natural state L 1. This structure has good lubrication, and friction can be ignored; 2) Based on the motor's requirements, determine the first and second critical speed points for increasing the width of the motor's magnetic bridge. At the first critical speed point, the magnetic bridge width just begins to increase, allowing for the selection of the inflection point speed. n 1. At the second critical speed point, the magnetic bridge width increases to its maximum value, allowing the selection of the peak speed. n 2; 3) When the motor is at the second critical speed point, the first distance between the center of the magnetic slider and the center of the rotating shaft. r 1. The selection of (slider facing the centrifugal radius) needs to meet the following requirements: , When the above relationship is satisfied, the centrifugal force of the magnetic slider is much greater than its own weight, and the influence of the slider weight is ignored. 4) Based on the first force model of the second critical speed, the combined parameters to be determined can be obtained ( k , L 2, θ The first relationship: , 5) When the motor is at the first critical speed point, the second distance between the center of the magnetic slider and the center of the rotating shaft. r 2 (Centrifugal radius of slider tilt) satisfies:

[0125] 6) Based on the second force model at the first critical speed, the combined parameters to be determined can be obtained ( k , L 2, θ The second relationship:

[0126] 7) Based on the three formulas in 4)-6) above, determine k , L 2 and θ Relationship; 8) Based on r 1×sin θ - L 0 / cos θ ≥0, further reduction θ The range of values ​​for must satisfy: ; 9) θ Within the above range of values, values ​​are taken sequentially, based on different... θ The values ​​are obtained by solving the three formulas in 4)-6) above. k and L 2. Specific values, forming multiple sets ( k , L 2, θ Combinatorial solutions; 10) Select the optimal ( k , L 2, θ The value of ) determines the rotor structure.

[0127] It should be noted that the formula in 8) above is based on Figure 2 It is concluded that r 1×sin θ for Figure 2 The length of the right-angled side AC of the large triangle. L 0 / cos θ for Figure 2 The side length BC of the small triangle must be AC≥BC; otherwise, the magnetic slider will not be able to completely separate from the magnetic bridge.

[0128] The motor rotor provided in this embodiment is designed and manufactured using the method described in the above embodiments.

[0129] This disclosure also provides an electric motor, such as... Figure 8 As shown, the motor 10 includes a motor stator 11 and a motor rotor 12 as described in the above embodiment. When the motor speed is less than or equal to a first critical speed, the magnetic guide slider and the magnetic bridge are in a first relative position, and the width of the magnetic bridge is the initial width. When the motor speed is greater than a second critical speed, the magnetic guide slider and the magnetic bridge are in a second relative position, and the width of the magnetic bridge is greater than the initial width. When the motor speed is greater than the first critical speed and less than the second critical speed, the magnetic guide slider moves continuously between the first and second relative positions with the motor speed, realizing adaptive adjustment of the magnetic bridge width.

[0130] This disclosure also provides a program product, such as... Figure 9 As shown, the program product includes one or more processors 21 and memory 22. Figure 9 Take a processor 21 as an example.

[0131] The controller may also include an input device 23 and an output device 24.

[0132] The processor 21, memory 22, input device 23, and output device 24 can be connected via a bus or other means. Figure 9 Taking the example of a connection between China and Israel via a bus.

[0133] The processor 21 can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips. The general-purpose processor can be a microprocessor or any conventional processor.

[0134] The memory 22, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 21 executes various functional applications and data processing of the server by running the non-transitory software programs, instructions, and modules stored in the memory 22, thereby implementing the steps of the above-described method embodiments.

[0135] The memory 22 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the use of the processing device operated by the server. Furthermore, the memory 22 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 22 may optionally include memory remotely located relative to the processor 21, and these remote memories may be connected to a network connection device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0136] Input device 23 can receive input digital or character information, and generate key signal inputs related to driver settings and function control of the server's processing unit. Output device 24 may include display devices such as a display screen.

[0137] One or more modules are stored in memory 22, and when executed by one or more processors 21, they perform actions such as... Figure 3 The method shown.

[0138] Those skilled in the art will understand that all or part of the processes in the above method embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes described in the above method embodiments. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory (FM), hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0139] Although embodiments of the present disclosure have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present disclosure, and such modifications and variations all fall within the scope defined by the appended claims.

[0140] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A motor rotor, characterized in that, include: Magnetic bridge (100), and The slider assembly (200) includes a magnetic slider (201) adjacent to the magnetic bridge (100) and an elastic element (202) for providing a restoring force to the magnetic slider (201). The magnetic slider (201) moves during motor operation due to the combined action of centrifugal force and the restoring force of the elastic element (202), changing its relative position with the magnetic bridge (100) and causing the width of the magnetic bridge to change. The combination of the elastic coefficient parameter, compression length parameter of the elastic element (202) and the tilt angle parameter of the magnetic slider (201) is selected so that when the motor speed increases to the first critical speed, the width of the magnetic bridge begins to increase, and when the motor speed increases to the second critical speed, the width of the magnetic bridge reaches its maximum value.

2. The motor rotor according to claim 1, characterized in that, The first critical speed is related to the inflection point speed on the motor's external characteristic curve, and the second critical speed is related to the peak speed on the motor's external characteristic curve.

3. The motor rotor according to claim 1 or 2, characterized in that, The combination of the elastic coefficient parameter, compression length parameter of the elastic element (202), and tilt angle parameter of the magnetic slider (201) is selected to satisfy the following: The magnetic slider (201) is subjected to a first force model at the second critical speed. This first force model ensures that when the motor speed reaches the second critical speed, the magnetic slider (201) is directly opposite the magnetic bridge body, and the distance between the center of the magnetic slider (201) and the center of the rotating shaft is a preset first distance. The magnetic slider (201) is subjected to a second force model at the first critical speed. The second force model is used to make the distance between the center of the magnetic slider (201) and the center of the rotating shaft a preset second distance when the motor speed reaches the first critical speed.

4. The motor rotor according to claim 3, characterized in that, The first force model is configured as follows: Based on the input second critical speed and the first distance between the center of the magnetic slider (201) and the center of the rotating shaft when the magnetic slider (201) is in full contact with the magnetic bridge, a first centrifugal force is generated in the magnetic slider (201); The component of the first centrifugal force in the moving direction of the magnetic slider (201) is generated based on the first centrifugal force and the tilt angle parameter; Based on the elastic coefficient parameter and the compression length parameter, a first compressive force is generated for the elastic element (202); as well as, Based on the fact that the component of the first centrifugal force in the moving direction of the magnetic slider (201) is equal to the first compressive force of the elastic element (202), a first relationship is determined between the elastic coefficient parameter, the compression length parameter of the elastic element (202), and the tilt angle parameter of the magnetic slider (201).

5. The motor rotor according to claim 4, characterized in that, The first force model is also configured as follows: The first distance is determined based on a set multiple by which the first centrifugal force is greater than the weight of the magnetic slider (201).

6. The motor rotor according to claim 3, characterized in that, The second force model is configured as follows: Based on the input first critical speed and the second distance between the center of the magnetic slider (201) and the center of the rotating shaft when the magnetic slider (201) begins to contact the magnetic bridge (100), a second centrifugal force is generated in the magnetic slider (201); The component of the second centrifugal force in the moving direction of the magnetic slider (201) is generated based on the second centrifugal force and the tilt angle parameter; Based on the elastic coefficient parameter and the compression length parameter, a second compressive force is generated for the elastic element (202); and, Based on the fact that the component of the second centrifugal force in the moving direction of the magnetic slider (201) is equal to the second compressive force of the elastic element (202), a second relationship is determined between the elastic coefficient parameter, the compression length parameter of the elastic element (202), and the tilt angle parameter of the magnetic slider (201).

7. The motor rotor according to claim 6, characterized in that, The second force model is also configured as follows: The second distance is determined based on the first distance and the pre-set geometric relationship between the first distance and the second distance; Furthermore, the motor rotor also includes a limiting mechanism, which is used to prevent the magnetic slider (201) from deviating from the set movement trajectory; The tilt angle parameter of the magnetic slider (201) satisfies the set motion geometry relationship so that the magnetic slider (201) maintains a relative positional relationship with the magnetic bridge (100) on a set moving trajectory during the movement.

8. An electric motor, characterized in that, It includes a motor stator and a motor rotor as described in any one of claims 1-7.

9. A method for designing a motor rotor, characterized in that, include: A first critical speed and a second critical speed that cause the magnetic bridge width to change are determined, wherein, during the process of increasing motor speed, when the motor speed increases to the first critical speed, the magnetic bridge width begins to increase, and when the motor speed increases to the second critical speed, the magnetic bridge width reaches its maximum value; The second critical speed is input into the first force model of the magnetic slider (201) at the second critical speed to obtain the first relationship between the elastic coefficient parameter, compression length parameter and tilt angle parameter of the elastic element (202) and the magnetic slider (201); The first critical speed is input into the second force model of the magnetic slider (201) at the first critical speed, and the second relationship between the elastic coefficient parameter, compression length parameter and tilt angle parameter of the elastic element (202) and the magnetic slider (201) is obtained. Obtain an optimal data combination of the tilt angle parameter, the elastic coefficient parameter, and the compression length parameter that simultaneously satisfies both the first and second relationships; and, The motor rotor designed based on the preferred data combination includes a magnetic bridge (100) and a slider assembly (200). The slider assembly (200) includes a magnetic slider (201) adjacent to the magnetic bridge (100) and an elastic element (202) for providing a restoring force to the magnetic slider (201). The magnetic slider (201) moves during motor operation due to the combined action of centrifugal force and the restoring force of the elastic element (202), resulting in a change in the width of the magnetic bridge.

10. The method according to claim 9, characterized in that, Determining the first critical speed and the second critical speed that cause the magnetic bridge width to change includes: Obtain the inflection point speed and peak speed on the external characteristic curve of the motor; The first critical speed is generated based on the inflection point speed; and... The second critical speed is generated based on the peak speed; Furthermore, obtaining the preferred data combination of the tilt angle parameter, the elastic coefficient parameter, and the compression length parameter that simultaneously satisfies the first relationship and the second relationship includes: Select multiple values ​​for the tilt angle parameter within its set range; For each value of the tilt angle parameter, the specific values ​​of the corresponding elastic coefficient parameter and compression length parameter are determined based on the first relationship and the second relationship, thereby determining multiple combinations of the tilt angle parameter, the elastic coefficient parameter, and the compression length parameter; and, Verify each combination of the tilt angle parameter, the elastic coefficient parameter, and the compression length parameter under pre-set constraints to obtain an optimal data combination of the tilt angle parameter, the elastic coefficient parameter, and the compression length parameter, so that when the motor speed reaches the second critical speed, the magnetic guide slider (201) is directly facing the magnetic bridge body and the distance between the center of the magnetic guide slider (201) and the center of the rotating shaft is the first distance, and the distance between the center of the magnetic guide slider (201) and the center of the rotating shaft is the second distance when the motor speed reaches the first critical speed; The method also includes: Obtain a motor model containing the designed motor rotor; Verify whether the motor model satisfies: When the motor speed is greater than the second critical speed, the magnetic guide slider (201) and the magnetic bridge are always in the first relative position where the magnetic guide slider (201) is directly opposite the magnetic bridge body, and the width of the magnetic bridge is greater than its initial width. When the motor speed is less than the first critical speed, the magnetic slider (201) and the magnetic bridge are always in a second relative position different from the first relative position, and the width of the magnetic bridge is its initial width. When the motor speed is greater than the first critical speed and less than the second critical speed, the magnetic guide slider (201) moves continuously between the first relative position and the second relative position with the motor speed to achieve adaptive adjustment of the magnetic bridge width. If so, generate first information to characterize that the motor rotor meets the design requirements; and, If not, generate second information to characterize that the motor rotor does not meet the design requirements.

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