Electromagnetic coil, magneto-rheological shock absorber and automobile

Abstract

The utility model discloses an electromagnetic coil, a magneto-rheological shock absorber and an automobile. The electromagnetic coil comprises an iron core and an excitation wire. The iron core is sleeved outside the sliding end, and a wire slot is annularly formed in the peripheral side of the iron core; the excitation wire is wound in the wire slot to form an excitation coil, and the cross section of the excitation wire is in a flat geometric shape; the magnetorheological damper comprises the electromagnetic coil and is applied to an automobile. In the scheme of the utility model, after the excitation lead is wound into the excitation coil, the gap between each turn of lead and the gap between the external lead of the excitation coil and the slot wall of the wire slot are greatly reduced, under the condition that the space of the wire slot is not changed, the number of turns of the coil can be increased by using the flat excitation lead, and the utilization rate of the space in the wire slot is higher; the effective working length of the electromagnetic coil is larger, the maximum damping force of the magneto-rheological shock absorber can be improved, the electromagnetic efficiency is greatly improved, and large damping force can be generated only through small current.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle damping technology field especially relates to a kind of electromagnetic coil, magnetorheological damper and car. BACKGROUND

[0002] Magnetorheological damper is a kind of device using magnetorheological effect to adjust damping, is widely used in mechanical vibration control, vehicle shock absorption, bridge shock insulation and other fields.Its working principle is to change magnetic field to control the rheological property of magnetorheological fluid, to realize the adjustment of damping force.The core of magnetorheological damper is magnetorheological fluid, which is a kind of suspension containing magnetic particles, in the absence of magnetic field, magnetorheological fluid behaves as ordinary liquid, particles are randomly distributed, when electromagnetic coil is energized to generate magnetic field, magnetic particles in magnetorheological fluid will arrange along the direction of magnetic field, form fibrous structure, thereby increase the viscosity and damping force of fluid, by changing the size of current, the intensity of magnetic field can be adjusted, and the rheological property of magnetorheological fluid is changed, to realize the dynamic adjustment of damping force.

[0003] In the existing magnetorheological damper, the electromagnetic coil adopts circular wire, the outer periphery of the iron core is provided with wire slot, and the multi-turn circular wire is wound in the wire slot.However, after the circular wire is wound on the iron core, there will inevitably be a gap between each turn of the coil, and there will also be a gap between the coil and the iron core, which makes the space utilization in the wire slot low, and the maximum current density that can be achieved by using the circular wire structure in the fixed wire slot space is small, which limits the performance of the magnetorheological damper. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide an electromagnetic coil, magnetorheological damper and car, to improve the maximum current density of the coil to improve the performance of the magnetorheological damper.

[0005] To achieve the above purpose, the utility model provides an electromagnetic coil applied to magnetorheological damper, comprising:

[0006] Iron core, the outer periphery of the iron core is provided with wire slot; and

[0007] Excitation wire, the excitation wire is wound in the wire slot to form excitation coil, and the cross section of the excitation wire is flat geometry.

[0008] In some embodiments of the utility model, the cross section of the excitation wire is rectangular, the width of the excitation wire is greater than the thickness, and the thickness direction of the excitation wire is arranged in the same direction as the radial direction of the iron core.

[0009] In some embodiments of the utility model, the ratio of the width to the thickness of the excitation wire is greater than or equal to 1.2 and less than or equal to 10.

[0010] In some embodiments of the utility model, the excitation wire is wound in multiple layers to form the excitation coil, and the ratio of the number of layers of the excitation coil to the number of turns of each layer of the excitation coil is greater than or equal to 1 / 2 and less than or equal to 30.

[0011] In some embodiments of the utility model, the wire slot is provided with at least two wire slots, and the at least two wire slots are arranged at intervals along the axial direction of the iron core.

[0012] The excitation coil is provided with at least two excitation coils, and one excitation coil is wound in one wire slot.

[0013] In some embodiments of the utility model, the wire slot is provided with two wire slots, the widths of the two wire slots (131) are b1 and b2 respectively, the width of the outer circumferential surface of the iron core (13) in the axial direction is w, and the three satisfy the relationship: 1 / 6≤(b1+b2) / w≤1 / 2.

[0014] In some embodiments of the utility model, the distances between the two edges of the circumferential side of the iron core in the axial direction and the adjacent wire slots (131) are c1 and c2 respectively, the distance between the two wire slots is e, and c1 and c2 are not less than e / 3 and not more than 2e / 3.

[0015] In some embodiments of the utility model, the excitation wire is an enameled wire.

[0016] The utility model also provides a magneto-rheological damper, which comprises a cylinder body, a floating piston and a damping piston, wherein,

[0017] The cylinder body is formed with an active chamber;

[0018] The floating piston is slidingly installed in the cylinder body and divides the active chamber into a liquid chamber and a gas chamber;

[0019] The damping piston comprises a piston rod, an upper pressing plate, a lower pressing plate, a piston outer sleeve and the electromagnetic coil;

[0020] Both ends of the piston rod are sliding ends and connecting ends respectively, the sliding end penetrates into the liquid chamber, the connecting end is exposed outside the cylinder body, and the iron core is connected to the sliding end;

[0021] The upper pressing plate and the lower pressing plate are connected to opposite sides of the iron core in the axial direction respectively, the piston outer sleeve is sleeved outside the iron core, and a through damping channel is formed between the upper pressing plate, the lower pressing plate and the iron core.

[0022] The utility model also provides an automobile comprising the magneto-rheological damper.

[0023] The technical scheme of the utility model discloses, the electromagnetic coil adopts the excitation conductor of flat shape, so after winding into the excitation coil, the clearance between every turn of conductor and the clearance between the conductor outside the excitation coil and the slot wall greatly reduce, under the condition of unchangeable slot space, the coil turns can be improved by using the flat excitation conductor, the space utilization in the slot is higher, the effective working length of electromagnetic coil is larger, the maximum damping force of magneto rheological damper can be improved, electromagnetic efficiency is greatly improved, and only small current can produce larger damping force. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the embodiment or prior art description needed to use the drawing briefly introduce, obviously, the drawing in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, other drawings can also be obtained according to the structure shown in these drawings.

[0025] Figure 1 The structure diagram of an embodiment of the magneto rheological damper provided by the utility model is shown in the drawing.

[0026] Figure 2 The structure diagram of the piston rod, the core and the excitation coil in the utility model scheme is shown in the drawing.

[0027] Figure 3 For Figure 2 The enlarged view of A in the drawing.

[0028] Figure 4 Still another structure diagram of the piston rod, the core and the excitation coil in the utility model scheme is shown in the drawing.

[0029] Explanation of reference numerals:

[0030] 100, magneto rheological damper, 10, electromagnetic coil, 11, cylinder body, 111, movable chamber, 1111, liquid cavity, 1112, gas cavity, 12, piston rod, 121, sliding end, 122, connecting end, 123, rod body, 124, fixed bolt, 1241, head, 1242, rod part, 13, core, 131, slot, 132, assembly through hole, 133, limit ring, 14, excitation conductor, 140, excitation coil, 15, upper pressing plate, 16, lower pressing plate, 17, piston outer sleeve, 20, floating piston, 30, damping channel.

[0031] The realization, functional characteristics and advantages of the utility model will be further described with reference to the drawings. DETAILED DESCRIPTION

[0032] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts, fall within the scope of the present application.

[0033] It should be noted that if the present application embodiments involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0034] In addition, if the present application embodiments involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skill in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of the present application.

[0035] Please refer to Figures 1 to 4The utility model provides a kind of electromagnetic coil 10 and magnetorheological damper 100, magnetorheological damper 100 includes: cylinder 11, floating piston 20 and damping piston;Wherein, active chamber 111 is formed in cylinder 11;Floating piston 20 is slidably installed in cylinder 11 and will active chamber 111 divide liquid cavity 1111 and gas cavity 1112;Damping piston includes piston rod 12, upper pressing plate 15, lower pressing plate 16, piston outer sleeve 17 and electromagnetic coil 10;Electromagnetic coil 10 includes iron core 13 and excitation conductor 14;Iron core 13 is sleeved in sliding end 121, and the outer circumferential side of iron core 13 is annular with wire slot 131;Excitation conductor 14 is wound in wire slot 131, forms excitation coil 140, and the section of excitation conductor 14 is flat geometry;Two ends of piston rod 12 are sliding end 121 and connecting end 122 respectively, sliding end 121 is arranged in liquid cavity 1111, connecting end 122 is exposed outside cylinder 11, and iron core 13 is connected to sliding end 121;Upper pressing plate 15 and lower pressing plate 16 are connected to the opposite sides of iron core 13 in axial direction respectively, and piston outer sleeve 17 is sleeved outside iron core 13, and through damping passage 30 is formed between upper pressing plate 15, lower pressing plate 16 and iron core 13.

[0036] In the technical scheme of the utility model, the electromagnetic coil 10 adopts the flat excitation conductor 14, so that the gap between each turn of the excitation conductor 14 and the gap between the outer conductor of the excitation coil 140 and the slot wall of the wire slot 131 are greatly reduced after the excitation conductor 14 is wound into the excitation coil 140. With the flat excitation conductor 14, the number of turns of the coil can be increased, the space utilization in the wire slot 131 is higher, and the effective working length of the electromagnetic coil is larger. The maximum damping force of the magnetorheological damper 100 can be improved, the electromagnetic efficiency is greatly improved, and a larger damping force can be generated with a smaller current. When the electromagnetic coil 10 is working, the viscosity of the surrounding magnetorheological fluid increases, and when the piston rod 12 is pressed to move, the magnetorheological fluid generates damping force through the damping passage 30. The arrangement of the upper pressing plate 15 and the lower pressing plate 16 not only protects the coil and the iron core 13, but also facilitates the assembly of the piston outer sleeve 17. The gas cavity 1112 contains high-pressure gas to provide elastic support, and by adjusting the pressure of nitrogen gas in the gas cavity 1112, the damping characteristics of the damper can be changed.

[0037] The structure shape of the cylinder body 11 is generally a simple cylindrical structure, and the specific structure of the cylinder body 11 can be appropriately adjusted based on actual conditions, and is not limited herein. The cross section of the excitation conductor 14 is in a flat geometric shape, which means that the width of the excitation conductor 14 is greater than the thickness of the excitation conductor 14. Specifically, it can be long or oval, and in some embodiments of the present application, the two sides of the excitation conductor 14 in the thickness direction are flat, and the two sides of the excitation conductor 14 in the width direction are arc-shaped, so that the cross section is capsule-shaped. Considering that when winding the excitation conductor 14, the inner part of the conductor in the radial direction of the iron core 13 generates compressive stress, and the outer part generates tensile stress, so that the stress inside the conductor is uneven. Therefore, when winding the excitation conductor 14, the thickness direction of the excitation conductor 14 is arranged in the same direction as the radial direction of the iron core 13 to avoid the above problem. If the width direction of the excitation conductor 14 is arranged in the same direction as the radial direction of the iron core 13, the excitation conductor 14 can be arranged in a circular ring shape, so that the outer ring length of the excitation conductor 14 is relatively large compared to the inner ring. In this way, the shape of the excitation conductor 14 is adapted to the iron core 13, thereby avoiding the problem of uneven stress.

[0038] Preferably, in some embodiments of the present application, the cross section of the excitation conductor 14 is rectangular, the width of the excitation conductor 14 is greater than the thickness, and the thickness direction of the excitation conductor 14 is arranged in the same direction as the radial direction of the iron core 13. After winding the excitation conductor 14 with a rectangular cross section, the gap between the conductors and the gap between the conductors and the wall of the wire slot 131 are smaller, the space utilization in the wire slot 131 is higher, and the internal stress of the excitation conductor 14 after winding is more uniform.

[0039] Generally, the conductor of the excitation conductor 14 is wrapped with an insulating material such as rubber, plastic, etc. If the ratio of the width to the thickness of the excitation conductor 14 is too large, the conductor is too flat. Compared to two excitation conductors 14 with the same rectangular cross-sectional area, the excitation conductor 14 with a larger cross-sectional area of the insulating material wrapped outside is more flat, and occupies more space. Therefore, in some embodiments of the present application, the ratio of the width to the thickness of the excitation conductor 14 is greater than or equal to 1.2 and less than or equal to 10. Specifically, it can be 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 5, 6, 8, 10, etc. In this way, the excitation conductor 14 is not too flat, thereby avoiding the problem that the overall external insulating material occupies more space in the wire slot 131.

[0040] The excitation conductor 14 is generally wound in multiple layers, and of course, it can also be wound in a single layer. Preferably, in some embodiments of the utility model, the excitation conductor 14 is wound in multiple layers to form an excitation coil 140, and the ratio of the number of layers of the excitation coil 140 to the number of turns of each layer of the excitation coil 140 is greater than or equal to 1 / 2 and less than or equal to 30, which can be 1 / 2, 2 / 3, 1, 2, 3, 5, 7, 8, 10, 12, 15, 20, 25, 30, etc. Winding in multiple layers can significantly increase the inductance of the coil, thereby improving the electromagnetic performance of the excitation coil 140. For details, see Figure 3 , Figure 3 The utility model scheme is a structure diagram of the piston rod 12, the core 13 and the excitation coil 140 after amplification, wherein the single-column excitation conductor 14 corresponds to a layer of the excitation coil 140. It can be understood that this can enhance the magnetic field strength and improve the damping force of the shock absorber for the magneto-rheological shock absorber 100. In addition, by setting the ratio of the number of layers of the excitation coil 140 to the number of turns of each layer of the excitation coil 140 within a reasonable range, the shape and number of turns of the coil can be avoided. Unreasonable distribution may cause instability of inductance and fluctuations in inductance value.

[0041] The wire slot 131 and the excitation coil 140 can be provided only in one group. Preferably, in some embodiments of the utility model, the wire slot 131 is provided with at least two, and the at least two wire slots 131 are arranged at intervals along the axial direction of the core 13. The excitation coil 140 is provided with at least two, and one excitation coil 140 is wound in one wire slot 131. By providing multiple wire slots 131 on the core 13 and winding multiple excitation coils 140, the magnetic field strength can be significantly enhanced. The magnetic fields generated by each excitation coil 140 are superimposed on each other, thereby improving the yield stress of the magneto-rheological fluid and enhancing the damping effect of the magneto-rheological shock absorber 100. Moreover, the multiple excitation coils 140 are arranged at intervals along the axial direction of the core 13, which can make the magnetic field more evenly distributed in the axial direction of the core 13, thereby improving the stability of the magneto-rheological shock absorber 100.

[0042] Considering that the core 13 has a magnetic saturation phenomenon, there is a limit to the magnetic flux per unit area, so the outer surface area of the core 13 is related to the upper limit of the magnetic induction intensity. When the outer surface area of the core 13 is small, it is easier to reach the magnetic saturation state. At this time, increasing the current of the excitation coil 140 does not have a significant effect on the improvement of the magnetic induction intensity. Therefore, in order to avoid the above problems, please refer to Figure 4In some embodiments of the utility model, two wire grooves are arranged, the widths of the two wire grooves are b1 and b2 respectively, the width of the outer circumferential surface of the iron core 13 in the axial direction is w, and the three satisfy the relationship: 1 / 6 <= (b1+b2) / w <= 1 / 2. Specifically, the value of n.b / w can be set to 1 / 6, 1 / 5, 2 / 5, 1 / 4, 1 / 3, 1 / 2 and the like, and is set according to the specific circumstances. Through the above scheme, on the basis of ensuring that the magnetic field distribution is relatively uniform, it is ensured that the area of the iron core 13 outside the excitation coil 140 is not too small, and it is also ensured that the wire groove 131 has sufficient space for accommodating the excitation coil 140, so that the upper limit of the magnetic induction intensity that can be generated by the excitation coil 140 and the iron core 13 as a whole is relatively high.

[0043] Further, in order to ensure that the magnetic induction intensity of each part of the iron core 13 outside is uniform, and to avoid the problem that part of the iron core 13 is magnetically saturated while other parts have less magnetic flux, in some embodiments of the utility model, the distance between the two edges of the circumferential side of the iron core 13 in the axial direction and the adjacent wire grooves 131 is c1 and c2 respectively, the distance between the two wire grooves 131 is e, and c1 and c2 are not less than e / 3 and not greater than 2e / 3. Specifically, the values of c1 / e and c2 / e can be set to 1 / 3, 2 / 5, 1 / 2, 2 / 3 and the like, so that the part between the two edges of the circumferential side of the iron core 13 in the axial direction and the adjacent two wire grooves 131 is arranged more uniformly, thereby ensuring that the magnetic field is more uniformly distributed in the axial direction of the iron core 13.

[0044] In some embodiments of the utility model, the iron core 13 is provided with an assembly through hole in the axial direction for assembling the piston rod 12, and the distance between the wire groove 131 and the assembly through hole is not less than the radius of the iron core 131 / 10, which can be set to 1 / 10, 1 / 8, 1 / 6, 1 / 5, 1 / 4, 1 / 3, 1 / 2 and the like of the radius of the iron core 13. In order to ensure that the part between the assembly through hole and the wire groove 131 has sufficient magnetic path area and avoids premature magnetic saturation. Further, considering that there are cases where the diameters of the assembly through holes 132 are not the same, resulting in different distances between the two wire grooves 131 and the assembly through hole in the radial direction of the iron core 13, in order to ensure that the magnetic path area is sufficient and the magnetic induction intensity of the electromagnetic coil 10 is uniform, the groove depth of the wire groove 131 with smaller distance from the assembly through hole in the radial direction of the iron core 13 can be smaller than that of the other wire groove 131, and the groove width can be greater than that of the other wire groove 131, so that the current cross-sectional area of the excitation coil in the two wire grooves is close. In this way, it can not only ensure that the magnetic path area is sufficient, but also make the magnetic induction intensity of the electromagnetic coil 10 more uniform.

[0045] In some embodiments of the utility model, the excitation conductor 14 is an enameled wire, the enameled wire has good insulation performance, prevents short circuit and electric leakage, ensures normal work of the excitation coil 140, the enameled wire has good flexibility, can be conveniently wound into coils of various shapes, and is suitable for different electromagnetic equipment structures.

[0046] The specific way of mounting the iron core 13 on the piston rod 12 is various, and the two can adopt interference fit or threaded connection, preferably, in some embodiments of the utility model, the piston rod 12 comprises a rod body 123 and a fixing bolt 124, an assembly through hole is arranged in the iron core 13, a limiting ring is arranged on the wall surface of the assembly through hole, one end of the rod body 123 is a sliding end 121, a threaded hole is formed in the end surface of the sliding end 121, the sliding end 121 is inserted into one end of the assembly through hole and abuts one side of the limiting ring, and the fixing bolt 124 comprises a head 1241 and a rod 1242 connected with each other, the rod 1242 is inserted into the assembly through hole and is screwed into the threaded hole, and the head 1241 is limited on the other side of the limiting ring. Through the double fixation of threaded connection and limiting ring, the connection between the piston rod 12 and the iron core 13 is firm and reliable. This design can effectively prevent the piston rod 12 from loosening due to vibration or impact during work, improve the overall stability of the shock absorber. The assembly process of the piston rod 12 and the iron core 13 is simplified, and the assembly can be quickly and accurately completed through the fixation of threaded connection and limiting ring, thereby improving the production efficiency.

[0047] Continuously referring to Figure 1 and Figure 4 , taking the electromagnetic coil 10 provided with two wire grooves 131 as an example, the widths of the two wire grooves 131 are b1 and b2 respectively, according to the flat plate model damping force calculation formula:

[0048]

[0049] In the formula, l1 is the effective length of the piston damping channel 30, l1=c1+e+c2, mm; l2 is the total width of all wire grooves 131, l2=b1+b2, mm; h is the gap between the magnetic core and the piston sleeve, mm; A p is the effective area of the piston, mm 2 ; D1 is the outer diameter of the piston sleeve, mm; d is the piston rod diameter, mm; v is the movement speed of the piston relative to the cylinder, m / s; sgn(v) is a sign function; τ y is the shear yield stress of the magnetorheological fluid under the action of the magnetic field, kPa; p0 is the nitrogen gas pressure filled in, kPa; η is the zero-field viscosity of the magnetorheological fluid, Pa·s.

[0050] According to the formula, without changing the overall appearance of the electromagnetic coil 10, by improving the shape of the excitation wire, increasing the current density of the excitation coil 140, the shear yield stress of the magnetorheological fluid under the action of the magnetic field is increased, and the damping force is increased. By integrating the multiple schemes in the above embodiments, the integrated scheme is simulated, and the control variable is used to compare the magnetorheological damper 100 using circular enameled wire and flat enameled wire. Roughly, using flat enameled wire to wind the coil can improve the space utilization rate of the wire slot 131 by 10%-20%, and the effective working length of the electromagnetic coil can be increased by 10%-20% under the same space. 10%-20% of the maximum damping force, the electromagnetic efficiency is improved by 10%-20%. The bandwidth of the adjustable range of the damping force is greatly improved, and the number of turns of the coil is also improved. Under the same damping force, a lower current can be used, which can greatly reduce power consumption.

[0051] The utility model also proposes a kind of automobile, including above-mentioned magnetorheological damper 100.The specific structure of the magnetorheological damper 100 refers to above-mentioned embodiment, since the present automobile has adopted all technical schemes of above-mentioned all embodiments, it at least has all beneficial effects brought by the technical scheme of above-mentioned embodiment, and here is not repeated.

[0052] The above is only exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and equivalent structural transformation using the utility model specification and drawing contents under the technical concept of the utility model, or direct / indirect application in other related technical fields are included in the patent protection range of the utility model.

Claims

1. An electromagnetic coil (10) for use in a magnetorheological damper, characterized in that, The iron core (13) has a wire slot (131) arranged on the outer periphery thereof; The excitation wire (14) is wound in the wire slot (131) to form an excitation coil (140), and the cross section of the excitation wire (14) is in a flat geometry. The cross section of the excitation wire (14) is in a rectangular shape, the width of the excitation wire (14) is greater than the thickness, and the thickness direction of the excitation wire (14) is arranged in the same direction as the radial direction of the iron core (13). The ratio of the width to the thickness of the excitation wire (14) is greater than or equal to 1.2 and less than or equal to 10.

2. The electromagnetic coil (10) of claim 1, wherein, The excitation wire (14) is wound in multiple layers to form the excitation coil (140), and the ratio of the number of layers of the excitation coil (140) to the number of turns of each layer of the excitation coil (140) is greater than or equal to 1 / 2 and less than or equal to 30.

3. The electromagnetic coil (10) of claim 2, wherein, The wire slot (131) is provided with at least two wire slots (131) arranged in the axial direction of the iron core (13); 4. The electromagnetic coil (10) of claim 1, wherein, The excitation coil (140) is provided with at least two excitation coils (140), and one excitation coil (140) is wound in one wire slot (131).

5. The electromagnetic coil (10) of claim 1, wherein, The wire slot is provided with two wire slots (131), the widths of the two wire slots (131) are b1 and b2 respectively, the width of the outer periphery of the iron core (13) in the axial direction is w, and the three satisfy the relationship: 1 / 6≤(b1+b2) / w≤1 / 2. The distance between the two edges of the iron core (13) in the axial direction and the adjacent wire slots (131) is c1 and c2 respectively, the distance between the two wire slots (131) is e, and c1 and c2 are not less than e / 3 and not greater than 2e / 3.

6. The electromagnetic coil (10) of claim 5, wherein, The excitation wire (14) is an enameled wire.

7. The electromagnetic coil (10) of claim 6, wherein, The cylinder (11), the floating piston (20) and the damping piston are included, wherein 8. The electromagnetic coil (10) according to any one of claims 1 to 7, characterized in that The cylinder (11) forms an active chamber (111) inside; 9. A magneto-rheological damper, characterized by, The floating piston (20) is slidably installed in the cylinder (11) and divides the active chamber (111) into a liquid chamber (1111) and a gas chamber (1112); The damping piston includes a piston rod (12), an upper pressing plate (15), a lower pressing plate (16), a piston outer sleeve, and an electromagnetic coil (10) according to any one of claims 1 to 8; Both ends of the piston rod (12) are a sliding end (121) and a connecting end (122), the sliding end (121) is arranged in the liquid chamber, the connecting end (122) is exposed outside the cylinder, and the iron core (13) is connected to the sliding end; The upper pressing plate (15) and the lower pressing plate (16) are respectively connected to the opposite sides of the iron core (13) in the axial direction, the piston outer sleeve is sleeved outside the iron core (13), and the damping passage (30) is formed between the upper pressing plate (15), the lower pressing plate (16) and the iron core (13). The magnetorheological damper (100) of claim 9 is included. ​ 10. An automobile characterized by comprising: ​

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