Eddy current damper pedigree design method and device

Abstract

The invention belongs to the field of eddy current damper design, and relates to an eddy current damper pedigree design method and device. The method comprises the following steps: changing the damping torque M by changing the effective axial length of coupling of a rotor and a magnetic field; wherein the damping torque M is a torque opposite to the motion direction of the rotor, which is generated by the rotor cutting a fixed magnetic field to induce the eddy current in the rotor when external motion is transmitted into the eddy current damper and drives the rotor to rotate.

Description

Technical Field

[0001] The invention belongs to the field of eddy current damper design, and relates to a pedigree design method and device for eddy current dampers. Background Art

[0002] The eddy current damper is a device that produces a damping effect based on electromagnetic principles. Its function is to provide damping force for aircraft control to prevent the pilot from operating too fast. The current design method includes structural design, electromagnetic design, and new structure verification processes, which leads to long design time, low efficiency, and repeated verification. These problems are serious and cannot meet the increasingly stringent delivery node requirements. Summary of the invention

[0003] In response to the above technical problems, the present invention provides a genealogical design method and device for eddy current dampers, which fully utilizes the existing design experience of eddy current dampers. When designing new products, only one quantity needs to be changed in the corresponding genealogical template product to complete the design of new products, thereby reducing unnecessary verification, thereby achieving the effect of rapid R&D and saving R&D resources.

[0004] Technical solution: In the first aspect, a method for systematically designing an eddy current damper is provided. The electromagnetic generating device of the eddy current damper comprises: a permanent magnet, a yoke, a rotor and an inner stator. The yoke and the inner stator are both made of magnetic conductive materials. The magnetic field generated by the permanent magnet forms a closed loop through the inner stator and the yoke. The rotor is a hollow cup-shaped structure made of special metal. The method comprises: The damping torque M is changed by changing the effective axial length of the rotor coupling with the magnetic field; Among them, the damping torque M is when the external motion is transmitted into the eddy current damper, driving the rotor to rotate, the rotor cuts the fixed magnetic field to induce eddy current in the rotor, and generates a torque in the opposite direction of the rotor movement.

[0005] The method of changing the damping torque M by changing the effective axial length of the rotor coupled with the magnetic field comprises: The axial length of the hollow cup wall of the original rotor is shortened to reduce the damping torque M, wherein the shorter the axial length of the hollow cup wall is, the shorter the axial length of the effective range of the air gap is, and the smaller the damping torque M is.

[0006] The calculation formula of damping moment M is:

[0007]

[0008] The method further comprises: Select N dampers with damping torque as N pedigree samples, and pre-set each pedigree sample except lThe parameters used to calculate M remain unchanged; If the required M value is between the damping moment values ​​of two spectrum samples, the larger spectrum sample is selected as the benchmark; According to the calculation formula, calculate the corresponding l The value is the effective axial length of the rotor coupling with the magnetic field.

[0009] After selecting a larger pedigree sample as a benchmark, the method further includes: According to finite element analysis, on the basis of the selected pedigree sample, the new rotor length is calculated while the other parameters remain unchanged and only the rotor length of the template product is changed, thus completing the new product design.

[0010] In a second aspect, a pedigree design device for an eddy current damper is provided, characterized in that it comprises: A processing module, used for changing the damping torque M by changing the effective axial length of the rotor coupled with the magnetic field; Among them, the damping torque M is when the external motion is transmitted into the eddy current damper, driving the rotor to rotate, the rotor cuts the fixed magnetic field to induce eddy current in the rotor, and generates a torque in the opposite direction of the rotor movement.

[0011] The processing module is specifically used for: The axial length of the hollow cup wall of the original rotor is shortened to reduce the damping torque M, wherein the shorter the axial length of the hollow cup wall is, the shorter the axial length of the effective range of the air gap is, and the smaller the damping torque M is.

[0012] The calculation formula of damping moment M is:

[0013]

[0014] Beneficial effects: When developing new products, the present invention only needs to calculate the maximum torque, calculate the rotor length matching the template product, and shorten the original rotor of the template product. There is no need to repeat the rest of the development process, nor to repeat the verification of the unchanged parts. The R&D efficiency is greatly improved, and the back-end production will not reduce efficiency due to differentiated design. The R&D efficiency is greatly improved, and the design time is reduced from 40h to 2h, and the efficiency is improved by more than 90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a plan view of the eddy current damper; Figure 2 is a cross-sectional view of the eddy current damper; Among them, 1-magnet, 2-yoke, 3-coil, 4-stator. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0017] See also Figure 1-2 The electromagnetic generating device of the eddy current damper is composed of a permanent magnet 1, a yoke 2, a rotor 3 and an inner stator 4. In the existing dampers, different damper pedigree samples are constructed according to different torque ranges, and the template products for each pedigree sample are set, that is, the products with the largest torque. When developing new products, it is only necessary to calculate the maximum torque, match the template product to calculate the rotor length, and shorten the original rotor of the template product. There is no need to repeat the rest of the development process, nor is there any need to repeat the verification of the unchanged parts, so as to achieve the purpose of rapid development.

[0018] The yoke 2 and the inner stator 4 are both made of magnetic conductive materials. The permanent magnet 1 generates a magnetic field that passes through the inner stator 1 and the yoke 2 to form a closed loop. The rotor 3 is a hollow cup-shaped structure made of special metal. When external motion is transmitted into the eddy current damper and drives the rotor 3 to rotate, the rotor 3 cuts the fixed magnetic field, thereby inducing eddy currents in the rotor 3, generating a torque opposite to the direction of motion of the rotor 3, which is called the damping torque.

[0019] The present invention changes the damping torque M by changing the effective axial length of the rotor coupled with the magnetic field; The method of changing the damping torque M by changing the effective axial length of the rotor coupled with the magnetic field specifically includes: The axial length of the hollow cup wall of the original rotor is shortened to reduce the damping torque M, wherein the shorter the axial length of the hollow cup wall is, the shorter the axial length of the effective range of the air gap is, and the smaller the damping torque M is.

[0020] The present invention analyzes the mathematical model of the damper torque characteristic as follows:

[0021]

[0022] From formula (1), it can be seen that the air gap magnetic induction intensity, pole pair number, rotor speed, rotor cup thickness, rotor diameter, rotor cup length, and rotor material resistivity will all affect the magnitude of the damping torque. The damping torque is proportional to the square of the air gap magnetic induction intensity, inversely proportional to the rotor material resistivity, inversely proportional to the permanent magnet pole pair number, proportional to the cube of the rotor average diameter, proportional to the rotor thickness, and proportional to the axial length of the effective range of the air gap. The easiest to change is the rotor length.

[0023] Summarize the existing damper parameters, build different damper pedigrees according to different torque ranges, and set the template products for each pedigree, that is, the products with the largest torque. When developing new products, you only need to calculate the maximum torque, match the template product to calculate the rotor length, and shorten the original rotor of the template product. There is no need to repeatedly verify the unchanged parts, so as to achieve the purpose of rapid development. The present invention greatly improves the efficiency of research and development, reducing the design time from 40h to 2h, and improving the efficiency by more than 90%.

Claims

1. A method for designing a pedigree-based eddy current damper, wherein the electromagnetic generating device of the eddy current damper comprises: The method is composed of a permanent magnet (1), a yoke (2), a rotor (3) and an inner stator (4), wherein the yoke (2) and the inner stator (4) are both made of magnetic conductive materials, the magnetic field generated by the permanent magnet (1) passes through the inner stator (1) and the yoke (2) to form a closed loop, and the rotor (3) is a hollow cup-shaped structure made of special metal. The method is characterized in that the method comprises: The damping torque M is changed by changing the effective axial length of the rotor (3) coupled with the magnetic field; The damping torque M is when external motion is transmitted into the eddy current damper, driving the rotor (3) to rotate, the rotor (3) cuts the fixed magnetic field, thereby inducing eddy currents in the rotor (3), generating a torque in the opposite direction of the motion of the rotor (3).

2. The method according to claim 1, characterized in that: The method of changing the damping torque M by changing the effective axial length of the rotor (3) coupled with the magnetic field comprises: The axial length of the hollow cup wall of the original rotor (3) is shortened to reduce the damping torque M, wherein the shorter the axial length of the hollow cup wall, the shorter the axial length of the effective range of the air gap, and the smaller the damping torque M.

3. The method according to claim 2, characterized in that The calculation formula of damping moment M is:

4. The method according to claim 3, characterized in that: The method further comprises: Select N dampers with damping torque as N pedigree samples, and pre-set each pedigree sample except l The parameters used to calculate M remain unchanged; If the required M value is between the damping moment values ​​of two spectrum samples, the larger spectrum sample is selected as the benchmark; According to the calculation formula, calculate the corresponding l The value is the effective axial length of the rotor (3) coupling with the magnetic field.

5. The method according to claim 4, characterized in that After selecting a larger pedigree sample as a benchmark, the method further includes: According to the finite element analysis, on the basis of the selected pedigree sample, the length of the new rotor (3) is calculated while the other parameters remain unchanged and only the length of the rotor (3) of the template product is changed, thereby completing the design of the new product.

6. A pedigree design device for eddy current dampers, characterized in that: include: A processing module, used for changing the damping torque M by changing the effective axial length of the rotor (3) coupled with the magnetic field; The damping torque M is when external motion is transmitted into the eddy current damper, driving the rotor (3) to rotate, the rotor (3) cuts the fixed magnetic field, thereby inducing eddy currents in the rotor (3), generating a torque in the opposite direction of the motion of the rotor (3).

7. The device according to claim 6, characterized in that The processing module is specifically used for: The axial length of the hollow cup wall of the original rotor (3) is shortened to reduce the damping torque M, wherein the shorter the axial length of the hollow cup wall, the shorter the axial length of the effective range of the air gap, and the smaller the damping torque M.

8. The device according to claim 7, characterized in that The calculation formula of damping moment M is:

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