Electromagnetic damping shock absorber and parameter design method thereof

Abstract

The present application relates to a kind of electromagnetic damping shock absorber and its parameter design method, it includes: shell, stator coil unit is fixed in shell;Piston rod, piston rod is fixed with rotor permanent magnet unit, and the part of piston rod that rotor permanent magnet unit is inserted into shell is set, so that rotor permanent magnet unit penetrates into stator coil unit, piston rod can reciprocate in shell along its axial direction, so that stator coil unit cuts the magnetic field formed by rotor permanent magnet unit.Due to the rotor permanent magnet unit of electromagnetic damping shock absorber uses permanent magnet, need not energization to play a role, need not power consumption and control access current, and by setting stator coil unit, when rotor permanent magnet unit is constantly reciprocated along with piston rod, the coil in stator coil unit will constantly cut the magnetic field formed by rotor permanent magnet unit, and induction current will be generated in coil, and the Lorentz force generated by induction current in magnetic field can provide damping force to realize damping effect, therefore, without energization, damping can also be realized.

Description

Technical Field

[0001] This invention relates to the field of automotive shock absorber technology, and in particular to an electromagnetic damping shock absorber and its parameter design method. Background Technology

[0002] During driving, the contact between the wheels and the ground causes vibrations in the vehicle. These vibrations are exacerbated at high speeds or on rough roads, potentially threatening driving safety. To reduce the amplitude of these vibrations, engineers have incorporated dampers into the vehicle's suspension system.

[0003] Among related technologies, one type of automotive damper that has been designed is an electromagnetic damping shock absorber. This electromagnetic damping shock absorber includes a piston, a piston rod, an iron core, a winding, and an excitation winding; the iron core includes an outer iron core and an inner iron core. By the coil moving up and down with the piston rod, it cuts the magnetic field of the magnetized iron core fixed at the lower end, using the Lorentz force to provide damping force and generate a vibration reduction effect.

[0004] However, this type of electromagnetic damping vibration damper requires an energized iron core to function, resulting in high power consumption, low magnetic field utilization, and high requirements for controlling the input current, making it difficult to implement.

[0005] Therefore, it is necessary to design a new electromagnetic damping vibration absorber and its parameter design method to overcome the above problems. Summary of the Invention

[0006] This invention provides an electromagnetic damping vibration isolator and its parameter design method to solve the problems in related technologies where electromagnetic damping vibration isolators require an electromagnetized iron core to function, resulting in high power consumption, low magnetic field utilization, and high requirements for controlling the input current, making them difficult to implement.

[0007] In a first aspect, an electromagnetic damping vibration damper is provided, comprising: a housing, wherein a stator coil unit is fixedly disposed within the housing; a piston rod, wherein a mover permanent magnet unit is fixedly disposed within the piston rod, and the portion of the piston rod with the mover permanent magnet unit is inserted into the housing, such that the mover permanent magnet unit penetrates into the stator coil unit; the piston rod is reciprocating within the housing along its axial direction, thereby causing the stator coil unit to cut the magnetic field formed by the mover permanent magnet unit.

[0008] In some embodiments, a plurality of the moving permanent magnet units are fixed on the piston rod, each moving permanent magnet unit including a moving yoke and a permanent magnet pole fixed outside the moving yoke; the permanent magnet poles of some moving permanent magnet units are N poles, the permanent magnet poles of some moving permanent magnet units are S poles, and the permanent magnet poles of two adjacent moving permanent magnet units are different.

[0009] In some embodiments, the number of the mover permanent magnet units with the permanent magnet pole of the permanent magnet on the piston rod being the same as the number of the mover permanent magnet units with the permanent magnet pole of the permanent magnet.

[0010] In some embodiments, the thickness of each permanent magnet pole along the piston rod axis is equal to the spacing between two adjacent permanent magnet poles.

[0011] In some embodiments, a plurality of stator coil units are fixedly disposed within the housing, each stator coil unit comprising: a stator core having a groove therein; and a coil winding installed within the groove, wherein the axis of the coil winding is parallel to the axis of the piston rod.

[0012] In some embodiments, the thickness of the coil winding in each stator core along the piston rod axis is equal to the spacing between two adjacent coil windings.

[0013] In some embodiments, a plurality of stator coil units are disposed within the housing, the plurality of stator coil units are arranged along the axial direction of the piston rod, and the plurality of stator coil units are fixed within the housing by a first retaining ring; a plurality of mover permanent magnet units are sleeved on the piston rod, the plurality of mover permanent magnet units are arranged along the axial direction of the piston rod, and the plurality of mover permanent magnet units are fixed to the piston rod by a second retaining ring.

[0014] In some embodiments, the housing includes: a main housing having a cavity formed therein, the stator coil unit being fixed within the main housing, and the piston rod being inserted into the main housing; a first end cap being fixed at one end of the main housing, the piston rod passing through the first end cap into the main housing; and a second end cap being fixed at the other end of the main housing, such that the second end cap and the first end cap seal the main housing.

[0015] Secondly, a parameter design method for the aforementioned electromagnetic damping vibration isolator is provided, wherein the electromagnetic damping vibration isolator includes multiple stator coil units and multiple mover permanent magnet units, and the parameter design method includes the following steps:

[0016] Based on the number of stator coil units Ns and the number of mover permanent magnet units Nm, determine the maximum effective number of stator coil units and mover permanent magnet units Nmax, where Nmax is a positive integer greater than 0;

[0017] The number of newly mated stator coil units or mover permanent magnet units during the reciprocating motion of the piston rod is defined as the number of new mating units n, where n is an integer greater than or equal to 0;

[0018] The width of each stator coil unit and each mover permanent magnet unit along the piston rod axis is defined as 2d, where d is greater than 0;

[0019] The maximum stroke Lmax of the vibration damper is determined based on the maximum number of effective fits Nmax, the number of new fits n, and the width 2d.

[0020] The minimum stroke Lmin of the vibration damper is determined based on the number of new mating elements n and the width 2d.

[0021] In some embodiments, when the damping characteristic of the electromagnetic damper is a constant value, the stroke of the damper is the minimum stroke Lmin, and the number of stator coil units Ns and the number of mover permanent magnet units Nm are determined according to the required damping.

[0022] In some embodiments, when the damping characteristic of the electromagnetic damper decreases linearly, the number of stator coil units Ns is the same as the number of mover permanent magnet units Nm, and the number of additional mating units n = 0.

[0023] In some embodiments, when the damping characteristics of the electromagnetic damper are initially constant and then linearly decrease, the number of stator coil units Ns is different from the number of mover permanent magnet units Nm, and the number of additional mating units n≠0.

[0024] The beneficial effects of the technical solution provided by this invention include:

[0025] This invention provides an electromagnetic damping vibration isolator and its parameter design method. Since the moving permanent magnet unit of the electromagnetic damping vibration isolator uses a permanent magnet, it can function without being powered, without consuming power or controlling the input current. Furthermore, by setting a stator coil unit, when the moving permanent magnet unit reciprocates with the piston rod, the coil in the stator coil unit will continuously cut the magnetic field formed by the moving permanent magnet unit, and an induced current will be generated in the coil. The Lorentz force generated by the induced current in the magnetic field will provide damping force to achieve the vibration reduction effect. Therefore, this invention can achieve vibration reduction without being powered. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of an electromagnetic damping vibration absorber provided in an embodiment of the present invention;

[0028] Figure 2This is a cross-sectional schematic diagram of an electromagnetic damping vibration absorber provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the internal structure of an electromagnetic damping vibration absorber provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the internal structure of another electromagnetic damping vibration absorber provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of a stator coil unit provided in an embodiment of the present invention;

[0032] Figure 6 This is a front view schematic diagram of a stator coil unit provided in an embodiment of the present invention;

[0033] Figure 7 for Figure 6 Schematic diagram of the cross section of AA;

[0034] Figure 8 This is a front view schematic diagram of the moving permanent magnet unit provided in an embodiment of the present invention;

[0035] Figure 9 This is a side view schematic diagram of the moving permanent magnet unit provided in an embodiment of the present invention;

[0036] Figure 10 The diagram showing the relationship between damper damping and piston rod displacement is provided for an embodiment of the present invention.

[0037] In the picture:

[0038] 1. Shell; 11. Main shell; 12. First end cap; 13. Second end cap;

[0039] 2. Stator coil unit; 21. Stator core; 211. Groove; 22. Coil winding;

[0040] 3. Piston rod; 4. Moving element permanent magnet unit; 41. Moving element yoke; 42. Permanent magnet poles;

[0041] 5. First retaining ring; 6. Second retaining ring. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Among the related technologies, the vibration dampers currently on the market include hydraulic vibration dampers and electromagnetic damping vibration dampers. The principle of hydraulic vibration dampers is that the fluid inside the damper provides damping force through the friction of a one-way valve to achieve the vibration reduction effect, converting the mechanical energy of vibration into the internal energy generated by friction.

[0044] However, hydraulic shock absorbers rapidly accumulate internal energy and generate heat when vibrating frequently under harsh conditions. Poor heat dissipation can even lead to high-temperature failure, and this internal energy is difficult to utilize and recover. The performance of the fluid inside the shock absorber (mainly hydraulic oil in the market) deteriorates over time, resulting in a short service life. It is also highly sensitive to temperature, performing poorly at low temperatures and even risking freezing and solidification, thus affecting the shock absorber's performance and lifespan. High requirements for sealing and cleanliness are placed on the shock absorber, as there is a risk of leakage and failure.

[0045] Some electromagnetic damping vibration isolators have complex manufacturing processes, requiring the magnetization of the iron core to function, resulting in high power consumption, low magnetic field utilization, and high requirements for controlling the input current, which is difficult to achieve. Other electromagnetic damping vibration isolators utilize the principle of magnetic repulsion, where distance has a significant impact on the repulsive force. Therefore, the effective stroke of the vibration isolator is short, and it also requires magnetization to function, resulting in high power consumption, poor vibration damping effect, and inability to recover energy.

[0046] This invention provides an electromagnetic damping vibration isolator and its parameter design method, which can solve the problems in related technologies where electromagnetic damping vibration isolators require an electromagnetized iron core to function, have high power consumption, low magnetic field utilization, and high requirements for controlling the input current, making them difficult to implement.

[0047] See Figures 1 to 3 As shown, an electromagnetic damping vibration damper provided in an embodiment of the present invention may include: a housing 1, wherein a stator coil unit 2 is fixedly disposed inside the housing 1, wherein the housing 1 seals its interior; a piston rod 3, wherein a moving permanent magnet unit 4 is fixedly disposed on the piston rod 3, and the portion of the piston rod 3 with the moving permanent magnet unit 4 is inserted into the housing 1, such that the moving permanent magnet unit 4 passes through the stator coil unit 2, that is, the stator coil unit 2 is annular, and the moving permanent magnet unit 4 is inserted into the annular stator coil unit 2; when the electromagnetic damping vibration damper is working, the piston rod 3 may reciprocate within the housing 1 along its axial direction, causing the stator coil unit 2 to cut the magnetic field formed by the moving permanent magnet unit 4. It should be understood that the stator coil unit 2 contains a coil, and during the continuous reciprocating motion of the piston rod 3, the coil continuously cuts the magnetic field formed by the moving permanent magnet unit 4.

[0048] In this embodiment of the invention, since the moving permanent magnet unit 4 of the electromagnetic damping vibration isolator uses a permanent magnet, it can function without being energized, requiring no power consumption or control of the input current. Furthermore, by setting up the stator coil unit 2, as the moving permanent magnet unit 4 reciprocates with the piston rod 3, the coil in the stator coil unit 2 continuously cuts the magnetic field formed by the moving permanent magnet unit 4, generating an induced current in the coil. The Lorentz force generated by this induced current in the magnetic field provides damping force, achieving a vibration reduction effect. This converts the mechanical energy of the vibration into electrical energy in the coil. Therefore, this invention can achieve vibration reduction without being energized, and the converted electrical energy can be collected through an external capacitor connected to the coil, achieving energy recovery. In this embodiment, the axis of the piston rod 3 is preferably located at the center of the stator coil unit 2, and the moving permanent magnet unit 4 reciprocates with the piston rod 3 at the center of the stator coil unit 2.

[0049] See Figure 8 and Figure 9 As shown, in some embodiments, a plurality of moving permanent magnet units 4 are fixed on the piston rod 3. The plurality of moving permanent magnet units 4 are arranged sequentially along the axial direction of the piston rod 3. Each moving permanent magnet unit 4 includes a moving yoke 41 and a permanent magnet pole 42 fixed outside the moving yoke 41. The moving yoke 41 and the permanent magnet pole 42 are both annular. The good conductor of the moving yoke 41 is the magnetic path between the magnetic poles. The permanent magnet pole 42 has two types of magnetic poles, one is the N pole and the other is the S pole. The permanent magnet pole 42 of some moving permanent magnet units 4 is the N pole and the permanent magnet pole 42 of some moving permanent magnet units 4 is the S pole. The permanent magnet poles 42 of two adjacent moving permanent magnet units 4 are different. That is to say, each moving permanent magnet unit 4 with an N pole and each moving permanent magnet unit 4 with an S pole are assembled alternately. The plurality of moving permanent magnet units 4 form a group of moving permanent magnet units 4. In this embodiment, the moving permanent magnet unit 4 on the piston rod 3 is divided into independent N-pole moving permanent magnet unit 4 and S-pole moving permanent magnet unit 4, which are respectively assembled on the piston rod 3. The number of N-pole moving permanent magnet unit 4 and S-pole moving permanent magnet unit 4 on the piston rod 3 can be flexibly adjusted to achieve different damping requirements. The damping of the electromagnetic damping shock absorber can be quickly changed by removing or adding moving permanent magnet unit 4.

[0050] In other embodiments, the piston rod 3 may also be provided with only one moving permanent magnet unit 4, and the moving permanent magnet unit 4 may be provided with both N-pole permanent magnet poles 42 and S-pole permanent magnet poles 42. For example, a moving magnetic yoke 41 may be provided, on which multiple permanent magnet poles 42 are arranged at intervals, and the polarities of two adjacent permanent magnet poles 42 are different.

[0051] Furthermore, based on the above technical solution, the number of the moving permanent magnet units 4 with the N pole of the permanent magnet 42 on the piston rod 3 is equal to the number of the moving permanent magnet units 4 with the S pole of the permanent magnet 42, so as to ensure that the moving permanent magnet units 4 with the N pole and the moving permanent magnet units 4 with the S pole are used in conjunction.

[0052] Preferred, see Figure 2 As shown, the thickness of each permanent magnet pole 42 along the axial direction of the piston rod 3 is equal to the spacing between two adjacent permanent magnet poles 42. The dimensional characteristics of each moving permanent magnet unit 4 are as follows: when the thickness of the annular moving yoke 41 along the axis of the piston rod 3 is 2d, the thickness of the annular permanent magnet pole 42 along the axis of the piston rod 3 is d, and the permanent magnet pole 42 is fixed in the middle position of the moving yoke 41. This dimensional characteristic ensures that when multiple moving permanent magnet units 4 are combined to form a moving permanent magnet unit 4 group, the thickness of the permanent magnet pole 42 along the axis of the piston rod 3 and the pole spacing are both d. With this setting, the pole spacing of the permanent magnet pole 42 can be equal to the coil spacing and work together so that after the coil cuts the magnetic field loop formed by a pair of unit groups, the next pair of unit groups will immediately form a new magnetic field loop for the coil to cut. This can maximize the utilization of the magnetic field and structural space, and also ensure the continuity of the damper function (i.e., the damping change is a continuous straight line, not intermittent or sometimes large and sometimes small).

[0053] See Figures 5 to 7 As shown, in some optional embodiments, a plurality of stator coil units 2 are fixed inside the housing 1. The plurality of stator coil units 2 are arranged sequentially along the axial direction of the piston rod 3. Each stator coil unit 2 may include: a stator core 21, wherein the stator core 21 is provided with a groove 211, wherein the stator core 21 is configured as an annular shape, the groove 211 is also configured as an annular shape, and the cross-sectional shape of the groove 211 is U-shaped; a coil winding 22, wherein the coil winding 22 is installed in the groove 211, and the axis of the coil winding 22 is parallel to the axis of the piston rod 3, that is, the coil winding 22 is an annular shape formed by multiple turns of coil. The axis of the stator core 21 is parallel to the axis of the piston rod 3 and perpendicular to the plane in which the coil winding 22 is located; a plurality of stator coil units 2 form a group of stator coil units 2. In this embodiment, the stator coil unit 2 inside the housing 1 is designed as an independent unit, which can flexibly adjust the number of stator coil unit 2 inside the housing 1 to achieve different damping requirements. The damping of the electromagnetic damping shock absorber can be quickly changed by disassembling or adding stator coil unit 2.

[0054] In other embodiments, the housing 1 may also contain only one stator coil unit 2, and multiple coil windings 22 may be provided in the stator coil unit 2. For example, an integral stator core 21 may be provided, and multiple grooves 211 may be provided on the stator core 21, with a coil winding 22 provided in each groove 211.

[0055] Preferably, the thickness of the coil winding 22 within each stator core 21 along the axis of the piston rod 3 is equal to the spacing between two adjacent coil windings 22. The dimensional characteristics of each stator coil unit 2 are as follows: when the thickness of the annular stator core 21 along the axis of the piston rod 3 is 2d, the thickness of the groove 211 inside the stator core 21 along the axis of the piston rod 3 is d, and the groove 211 is designed at the middle position of the stator core 21. This dimensional characteristic ensures that when multiple stator coil units 2 form a group of stator coil units 2, the thickness of the coil along the axis of the piston rod 3 and the coil spacing are both d. This arrangement ensures that the width of the magnetic field lines in the magnetic field loop is equal to the width of the coil, and the coil spacing is equal to the pole spacing of the permanent magnet poles 42, both being d. These two factors work together to allow the coil to immediately begin cutting the magnetic field lines of the next pair of unit groups after cutting the magnetic field lines of the magnetic field loop formed by one pair of unit groups, maximizing the utilization of the magnetic field and structural space, and ensuring the continuity of the vibration damper function.

[0056] See Figure 2 As shown, in some embodiments, a plurality of stator coil units 2 are disposed within the housing 1, the plurality of stator coil units 2 are arranged along the axial direction of the piston rod 3, and the plurality of stator coil units 2 are fixed within the housing 1 by a first retaining ring 5; a plurality of mover permanent magnet units 4 are sleeved on the piston rod 3, the plurality of mover permanent magnet units 4 are arranged along the axial direction of the piston rod 3, and the plurality of mover permanent magnet units 4 are fixed to the piston rod 3 by a second retaining ring 6. In this embodiment, the stator coil units 2 and the mover permanent magnet units 4 are fixed by the first retaining ring 5 and the second retaining ring 6, making the assembly of the stator coil units 2 and the mover permanent magnet units 4 simple and convenient, and easy to disassemble, and the structure of the entire electromagnetic damping vibration damper is also simple.

[0057] Of course, in other embodiments, the stator coil unit 2 can be welded and fixed inside the housing 1, or the mover permanent magnet unit 4 can be welded and fixed on the piston rod 3.

[0058] See Figure 1 and Figure 2As shown, in some optional embodiments, the housing 1 may include: a main housing 11, in which a cavity is formed, the stator coil unit 2 is fixedly disposed within the main housing 11, and the piston rod 3 is inserted into the main housing 11; a first end cover 12, which is fixedly disposed at one end of the main housing 11, and the piston rod 3 passes through the first end cover 12 into the main housing 11; and a second end cover 13, which is fixedly disposed at the other end of the main housing 11, such that the second end cover 13 and the first end cover 12 seal the main housing 11. In this embodiment, the housing 1 is divided into a main housing 11 and two separate end caps: a first end cap 12 and a second end cap 13. This facilitates the assembly of components such as the piston rod 3, stator coil unit 2, and mover permanent magnet unit 4 into the housing 1. The first end cap 12 and the second end cap 13 can be fixed to the main housing 11 using a modular assembly method, eliminating the need for welding. The electromagnetic damping vibration damper reaches its upper limit when one end of the piston rod 3 contacts the second end cap 13, and its lower limit when the second retaining ring 6 on the piston rod 3 contacts the first end cap 12. Therefore, by changing the size of the first end cap 12 and the second end cap 13 protruding from the main housing 11 (or the distance between the first end cap 12 and the second end cap 13), the upper limit of the electromagnetic damping vibration damper can be shifted to the lower limit, thus altering the upper and lower strokes of the damper. Therefore, this embodiment uses a modular assembly method to fix the first end cap 12 and the second end cap 13. The positions of the first end cap 12 and the second end cap 13 relative to the main housing 11 can be adjusted by disassembly, achieving adjustability of the damper's stroke.

[0059] Regarding assembly-type fixing, for example, multiple grooves or elongated holes can be added to the main housing 11, and the first end cover 12 and the second end cover 13 have matching bosses. The design spacing between multiple grooves can be set to multi-level adjustment. Another example is to use a screw height adjustment mechanism, add threads to both ends of the main housing 11, and add matching threads to the first end cover 12 and the second end cover 13 at both ends, so that stepless adjustment can be achieved.

[0060] Of course, in other embodiments, the second end cap 13 and the main housing 11 can be made as one piece, and the first end cap 12 and the main housing 11 can be welded together. The housing 1 of this solution is more robust, but the stroke of the shock absorber will be fixed and cannot be adjusted.

[0061] Preferably, the first end cap 12 may be provided with an annular cylindrical boss, through which the piston rod 3 passes and is inserted into the main housing 11. The annular cylindrical boss can guide the piston rod 3.

[0062] The electromagnetic damping vibration isolator provided in this invention has a simple structure and is easy to assemble. Both the coil and the permanent magnet are designed as individual units, allowing for flexible design of the number of units in the stator coil unit 2 and the mover permanent magnet unit 4 to meet different damping requirements. Furthermore, the damping of the vibration isolator can be quickly changed by disassembling or adding the stator coil unit 2 and the mover permanent magnet unit 4. The vibration isolator uses permanent magnets, which can function without electricity and can also recover the electrical energy converted by the vibration isolator. This is because the vast majority of the mechanical energy of the vibration is converted into electrical energy, with only a very small portion converted into internal energy due to the resistance of the coil, making it extremely difficult to accumulate heat. Moreover, the materials used in the components have a wide temperature tolerance range and are less affected by the ambient temperature. This invention uses Lenz's law and Lorentz force to provide damping force and achieve the vibration reduction effect. The upper and lower strokes of the vibration isolator are flexibly adjusted and controlled by the size of the first end cover 12 and the second end cover 13 protruding from the main housing 11, allowing a single vibration isolator to meet various stroke requirements.

[0063] This invention also provides a parameter design method for the above-mentioned electromagnetic damping vibration isolator, wherein the electromagnetic damping vibration isolator includes multiple stator coil units 2 and multiple mover permanent magnet units 4. The damping magnitude of the electromagnetic damping vibration isolator is mainly determined by the number of stator coil units 2 Ns, the number of mover permanent magnet units 4 Nm (Nm must be an even number), the coil material of the stator coil units 2, and the magnetic strength of the permanent magnets of the mover permanent magnet units 4. The parameter design method includes the following steps:

[0064] Step 1: Based on the number of stator coil units 2 (Ns) and the number of mover permanent magnet units 4 (Nm), determine the maximum effective number of engagements (Nmax) between stator coil units 2 and mover permanent magnet units 4, where Nmax is a positive integer greater than 0. Define N as the effective number of engagements between stator coil units 2 and mover permanent magnet units 4. Then, the maximum effective number of engagements for this electromagnetic damping vibration absorber is Nmax = min{Ns, Nm}. When the number of mover permanent magnet units 4 is less than the number of stator coil units 2, the minimum value of Nmax is 1. For example, if there is only one stator coil unit (Ns = 1), then regardless of the number of mover permanent magnet units 4, Nmax is always 1. When the number of mover permanent magnet units 4 is greater than the number of stator coil units 2 (Nm > Ns), since the number of mover permanent magnet units 4 must be even, the minimum value of Nmax is 2.

[0065] Before or after step 1, the number of newly engaged stator coil units 2 or mover permanent magnet units 4 during the reciprocating motion of the piston rod 3 is defined as the number of new engagements, n, where n is an integer greater than or equal to 0. The reciprocating motion refers to the upward or downward stroke of the piston rod 3. The width of each stator coil unit 2 and each mover permanent magnet unit 4 along the axis of the piston rod 3 is defined as 2d, where d is greater than 0.

[0066] Here, "new engagement" refers to the number of times the mover permanent magnet unit 4 and stator coil unit 2 re-engage during the upper or lower stroke of the piston rod 3. The value of the number of new engagements, n, is related to the initial relative positions of the mover permanent magnet unit 4 and stator coil unit 2 in the damper. There are two main cases: when the number of mover permanent magnet units 4, Nm, is less than the number of stator coil units 2, Ns, that is, when the number of stator coil units 2 is greater (see...). Figure 4 (As shown), the number of new matings n here refers to the number of matings that the permanent magnet unit 4 enters the new stator coil unit 2. For example, the number of new matings n when the piston rod 3 moves upward. (上) The numbers are the number of stator coil units 2 exposed above, and the number n of new mating units that the piston rod 3 makes as it moves downward. (下) This refers to the number of stator coil units 2 that are exposed below. These exposed units are the stator coil units 2 that were not initially paired with the mover permanent magnet unit 4.

[0067] When the number of moving permanent magnet units 4, Nm, is greater than the number of stator coil units 2, Ns, that is, when the number of moving permanent magnet units 4 is greater (see... Figure 3 As shown in the diagram, the number n of new matings here refers to the number of new moving permanent magnet units 4 entering the stator coil unit 2 for mating. For example, when the piston rod 3 moves upward (i.e., the upward stroke), the number n of new matings... (上) This refers to the number of permanent magnet units 4 exposed below, and the number n of new mating units formed by the downward movement of piston rod 3. (下) This refers to the number of moving permanent magnet units 4 that are exposed above. The units exposed here are the moving permanent magnet units 4 that were not initially located within the stator coil unit 2.

[0068] Step 2: Determine the maximum stroke Lmax of the shock absorber based on the maximum number of effective fits Nmax, the number of new fits n, and the width 2d.

[0069] Step 3: Determine the minimum stroke Lmin of the shock absorber based on the number of new mating parts n and the width 2d.

[0070] The coil material of stator coil unit 2 and the magnetic strength of permanent magnet in mover permanent magnet unit 4 need to be determined comprehensively based on factors such as application conditions and cost. These factors determine the damping magnitude when a unit stator coil unit 2 and a unit mover permanent magnet unit 4 are coupled, i.e., the unit damping Co. Therefore, the damping magnitude of the shock absorber is C = N * Co, where N is the effective number of couplings between stator coil unit 2 and mover permanent magnet unit 4. The shock absorber's stroke L must be less than the maximum stroke Lmax = 2d * (Nmax + n), because when the piston rod 3's displacement x > Lmax, the effective number of couplings between stator coil unit 2 and mover permanent magnet unit 4 N = 0, and the shock absorber's damping C = 0. The shock absorber's stroke L must be greater than the minimum stroke Lmin = 2d * n. When the piston rod 3's displacement x is in the interval (0, Lmin), the shock absorber's damping C is always at its maximum value, i.e., C = Cmax = Nmax * Co. Therefore, the shock absorber's stroke needs to be within the interval [Lmin, Lmax]. The relationship between the shock absorber's damping and the piston rod's displacement is as follows: Figure 10 As shown.

[0071] Furthermore, the stroke of the vibration damper also needs to consider the damping characteristics required by the actual application conditions, according to... Figure 1 As shown, this electromagnetic damping vibration isolator can have three different damping characteristics depending on the design scheme.

[0072] The first type of damping characteristic is as follows: when the damping characteristic of the electromagnetic damping vibration damper is a constant value, the stroke of the vibration damper is the minimum stroke Lmin, the damping of the vibration damper is a constant value Cmax=Nmax*Co, and the number of stator coil units 2 Ns and the number of mover permanent magnet units 4 Nm can be determined according to the required damping.

[0073] The second type of damping characteristic is as follows: When the damping characteristic of the electromagnetic damping vibration isolator decreases linearly, the number of stator coil units 2, Ns, is the same as the number of mover permanent magnet units 4, Nm, i.e., Ns = Nm = N. The number of newly added components, n = 0, the minimum stroke, Lmin = 0, and the maximum stroke, Lmax = 2d * N. The stroke L of the vibration isolator takes a value in the range (0, 2d * N) according to the actual situation. The damping C of the vibration isolator changes linearly from the maximum value to the minimum value. The maximum damping value, Cmax = N * Co, and the minimum damping value, Cmin = Co * (Lmax - L) / 2d.

[0074] The third type of damping characteristic is as follows: When the damping characteristic of the electromagnetic damping vibration isolator is initially constant and then linearly decreasing, the number of stator coil units 2 (Ns) and the number of mover permanent magnet units 4 (Nm) of this electromagnetic damping vibration isolator must be different. Therefore, the number of additional mating elements (n≠0) must be added. The maximum effective number of mating elements (Nmax) = min{Ns, Nm}, the minimum stroke (Lmin) = 2d*n, and the maximum stroke (Lmax) = 2d*(Nmax+n). The stroke L of the vibration isolator is taken in the range [Lmin, Lmax] according to the actual situation. The damping C of the vibration isolator initially remains at its maximum value (Cmax) and then linearly decreases to its minimum value (Cmin). The maximum value (Cmax) = Nmax*Co, and the minimum value (Cmin) = Co*(Lmax-L) / 2d.

[0075] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0076] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0077] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A parameter design method for an electromagnetic damping vibration isolator, characterized in that, Electromagnetic damping vibration absorbers include: Housing (1), wherein a stator coil unit (2) is fixedly disposed inside the housing (1); A piston rod (3) is fixedly provided with a moving permanent magnet unit (4), and the part of the piston rod (3) provided with the moving permanent magnet unit (4) is inserted into the housing (1), so that the moving permanent magnet unit (4) passes into the stator coil unit (2), and the piston rod (3) reciprocates in the housing (1) along its axial direction, so that the stator coil unit (2) cuts the magnetic field formed by the moving permanent magnet unit (4); The piston rod (3) is fixed with a plurality of moving permanent magnet units (4), each moving permanent magnet unit (4) including a moving yoke (41) and a permanent magnet pole (42) fixed outside the moving yoke (41). The thickness of each permanent magnet pole (42) along the axis of the piston rod (3) is equal to the distance between two adjacent permanent magnet poles (42), and the permanent magnet pole (42) is fixed at the middle position of the moving yoke (41). When the thickness of the moving yoke (41) along the axis of the piston rod (3) is 2d, the thickness of the permanent magnet pole (42) along the axis of the piston rod (3) is d. The housing (1) is equipped with a plurality of stator coil units (2), each stator coil unit (2) including: a stator core (21), the stator core (21) having a groove (211); a coil winding (22), the coil winding (22) being installed in the groove (211), and the axis of the coil winding (22) being parallel to the axis of the piston rod (3); the thickness of the coil winding (22) in each stator core (21) along the axis of the piston rod (3) is equal to the distance between two adjacent coil windings (22), when the thickness of the stator core (21) along the axis of the piston rod (3) is 2d, the thickness of the groove (211) along the axis of the piston rod (3) is d, and the groove (211) is located in the middle position of the stator core (21); The parameter design method includes the following steps: Based on the number of stator coil units (2) Ns and the number of mover permanent magnet units (4) Nm, determine the maximum effective number of stator coil units (2) and mover permanent magnet units (4) Nmax, where Nmax is a positive integer greater than 0, and Nmax = min{Ns, Nm}; The number of newly engaged stator coil units (2) or mover permanent magnet units (4) during the reciprocating motion of piston rod (3) is defined as the number of newly engaged units n, where n is an integer greater than or equal to 0; The thickness of each stator coil unit (2) and each mover permanent magnet unit (4) along the axis of the piston rod (3) is defined as 2d, where d is greater than 0; The maximum stroke Lmax of the vibration damper is determined based on the maximum number of effective fits Nmax, the number of new fits n, and the thickness 2d. The minimum stroke Lmin of the vibration damper is determined based on the number of new mating elements n and the thickness 2d. When the damping characteristic of the electromagnetic damper is constant, the stroke of the damper is (0, Lmin), Lmin = 2d*n, and the number of stator coil units (2) Ns and the number of mover permanent magnet units (4) Nm are determined according to the required damping; or, When the damping characteristic of the electromagnetic damper decreases linearly, the number of stator coil units (2) Ns is the same as the number of mover permanent magnet units (4) Nm, the number of new mating units n=0, the minimum stroke Lmin=0, the maximum stroke Lmax=2d*Ns, or Lmax=2d*Nm; or, When the damping characteristic of the electromagnetic damper is initially constant and then linearly decreases, the number of stator coil units (2) Ns is different from the number of mover permanent magnet units (4) Nm. The number of newly added components n≠0, the minimum stroke Lmin=2d*n, and the maximum stroke Lmax=2d*(Nmax+n).

2. The parameter design method as described in claim 1, characterized in that: The number of the moving permanent magnet units (4) with the permanent magnet pole (42) on the piston rod (3) being N poles is equal to the number of the moving permanent magnet units (4) with the permanent magnet pole (42) being S poles.

3. The parameter design method as described in claim 1, characterized in that: Multiple stator coil units (2) are arranged along the axial direction of the piston rod (3), and multiple stator coil units (2) are fixed inside the housing (1) by a first retaining ring (5); The piston rod (3) is fitted with a plurality of moving permanent magnet units (4), which are arranged along the axial direction of the piston rod (3) and are fixed to the piston rod (3) by a second retaining ring (6).

4. The parameter design method as described in claim 1, characterized in that, The housing (1) includes: The main housing (11) has a cavity inside, the stator coil unit (2) is fixed inside the main housing (11), and the piston rod (3) is inserted inside the main housing (11). The first end cap (12) is fixed to one end of the main housing (11), and the piston rod (3) passes through the first end cap (12) and enters the main housing (11). The second end cap (13) is fixed to the other end of the main housing (11) such that the second end cap (13) and the first end cap (12) seal the main housing (11).

5. The parameter design method as described in claim 1, characterized in that: The permanent magnet poles (42) of some of the moving permanent magnet units (4) are N poles, the permanent magnet poles (42) of some of the moving permanent magnet units (4) are S poles, and the permanent magnet poles (42) of two adjacent moving permanent magnet units (4) are different.

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