Electromagnetic rigidity adjusting three-mass flywheel damping device and control method

Abstract

The invention discloses an electromagnetic rigidity adjusting three-mass flywheel damping device and a control method. The system comprises a first mass assembly, a second mass assembly, an electromagnetic induction assembly arranged on the second mass assembly, a third mass assembly arranged between the first mass assembly and the second mass assembly, and a control mechanism arranged on one side of the second mass assembly. The electromagnetic induction assembly is used for being matched with the third mass assembly to generate a magnetic coupling effect, the torsional rigidity of the second mass assembly is changed through the magnetic coupling effect, and the torsional vibration degree of the second mass assembly is reduced by changing the torsional rigidity; the control mechanism is used for controlling the magnetic coupling strength between the electromagnetic induction assembly and the third mass assembly; the torsional rigidity can be adjusted by accurately controlling the coupling area of the permanent magnets, the problems that the frequency band of DMF is narrow and an existing shock absorber is narrow in frequency band and limited in size are solved, and the shock absorber can adapt to various working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of torsional vibration reduction of a power transmission system, and in particular to an electromagnetic stiffness-adjusting three-mass flywheel vibration reduction device and a control method thereof. Background Art

[0002] As one of the main forms of automobile vibration, transmission system torsional vibration has a direct impact on the ride comfort and durability of automobile components. As consumers' requirements for automobile ride comfort increase day by day, how to effectively neutralize transmission system torsional vibration and improve the comfort of passengers has become the focus of automobile manufacturers and scientific researchers.

[0003] At present, the two main mechanisms used in automobiles to neutralize vibration and improve ride comfort are the clutch torsional damper (CTD) and the dual mass flywheel (DMF); however, both mechanisms have certain limitations in practical applications.

[0004] Although the clutch driven plate torsional damper (CTD) can reduce the torsional vibration of the transmission system to a certain extent, its axial size is limited by the spatial size of the clutch driven plate, resulting in a small design size of the elastic element, a small relative rotation angle of the damper, and a large stiffness. These problems make the vibration transmission rate of the CTD high and the vibration isolation effect unsatisfactory, especially in the low-speed zone, where there is almost no obvious vibration isolation effect, making it difficult to meet the increasingly high requirements for ride comfort.

[0005] Compared with CTD, dual-mass flywheel (DMF) is a more advanced vibration reduction mechanism. It effectively reduces the transmission of torsional vibration of the transmission system by adding a secondary flywheel and damping elements. However, despite the continuous development of DMF technology, its technical maturity and reliability still need to be improved. Under extreme conditions such as vehicle starting and emergency stopping, DMF may fail or perform poorly. In addition, the vibration reduction performance adjustment of DMF mainly depends on parameters such as spring stiffness, damping, primary mass and secondary mass moment of inertia. However, damping has more stringent requirements on the adjustment of vibration reduction performance, and DMF has the problem of narrow operating frequency bandwidth. The vibration reduction effect is not obvious in the low-frequency area and can only work within a specific bandwidth range.

[0006] In summary, the existing clutch torsional damper (CTD) and dual mass flywheel (DMF) dampers both have their own shortcomings: CTD is limited by space size and has poor vibration isolation effect; although DMF has better performance, its technical maturity and reliability need to be improved, and there are problems such as narrow working bandwidth and weak vibration reduction effect in the low-frequency area; therefore, the existing dampers are difficult to adapt to various operating conditions of automobiles, and the development of a new type of transmission torsional vibration damper is of great significance to improving automobile ride comfort and component durability. Summary of the invention

[0007] The object of the present invention is to provide an electromagnetic stiffness-adjustable three-mass flywheel vibration reduction device and a control method, thereby solving all or one of the above-mentioned problems existing in the prior art.

[0008] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows: In one aspect, the present invention provides an electromagnetic stiffness-adjustable three-mass flywheel vibration reduction device, comprising: A first mass component, a second mass component, an electromagnetic induction component disposed on the second mass component, a third mass component disposed between the first mass component and the second mass component, and a control mechanism disposed on one side of the second mass component; The electromagnetic induction component is used to cooperate with the third mass component to produce a magnetic coupling effect, and change the torsional stiffness of the second mass component through the magnetic coupling effect, so as to reduce the torsional vibration degree of the second mass component through the change of the torsional stiffness; The control mechanism is used to control the magnetic coupling strength between the electromagnetic induction component and the third mass component.

[0009] As an improved solution, a first secondary flywheel parallel to the first mass component is provided on the first mass component; The second mass component comprises: a second secondary flywheel and a first inertia disc; the second secondary flywheel is parallel to the first secondary flywheel and is sleeved on the transmission shaft of the first secondary flywheel, a gap is provided between the second secondary flywheel and the first secondary flywheel, and the center of the second secondary flywheel and the end of the transmission shaft of the first secondary flywheel are fixed to each other by using a fixing pin; the first inertia disc is arranged parallel to the first secondary flywheel, and the first inertia disc is transmission sleeved on the transmission shaft of the first secondary flywheel and is located between the first secondary flywheel and the second secondary flywheel, and a gap is provided between the first inertia disc and the first secondary flywheel; The third mass component includes: a second inertia disc and a yoke group; the second inertia disc is arranged parallel to the first secondary flywheel, and the second inertia disc transmission sleeve is arranged on the transmission shaft of the first secondary flywheel, and the second inertia disc is located between the first secondary flywheel and the first inertia disc; the first inertia disc and the second inertia disc are coaxially connected and support coaxial rotation; the yoke group is evenly distributed along the inner side wall of the second inertia disc and around the center of the second inertia disc.

[0010] As an improved solution, the electromagnetic induction component includes: a winding coil and an iron core group; The core group is arranged along and around the edge of the second secondary flywheel, and the core group is evenly distributed; The core group and the yoke group correspond to each other, and the axial thickness of the cores in the core group and the yokes in the yoke group are consistent; in a non-working state, the cores in the core group and the yokes in the yoke group are radially distributed and there is a gap; The winding coil is arranged around the edge of the second secondary flywheel, the winding coil is connected to the iron core group, and the winding coil leads out two electrodes and is electrically connected to the control mechanism.

[0011] As an improved solution, the control mechanism includes: a servo motor, a collector ring and a brush; The collector ring is sleeved on the end of the fixing pin, and the two electrodes of the winding coil are in contact with the collector ring; The brush is connected to the slip ring; The servo motor is arranged at the proximal end of the second secondary flywheel, and the servo motor is connected to the brush for power supply; The servo motor is used to supply power to the core group through the brush. The servo motor changes the magnetic force amplitude of the core group on the yoke iron group based on the adjustment of the current; the core group changes the torsional stiffness of the second secondary flywheel based on the adjustment of the magnetic force amplitude.

[0012] On the other hand, the present invention further provides a control method for use in the electromagnetic stiffness adjustment three-mass flywheel vibration reduction device, the control method comprising the following steps: Preset vibration frequency threshold; When the engine torsional vibration is transmitted to the first mass component, the torsional vibration is attenuated based on the internal structures of the first mass component and the second mass component; When the vibration frequency of the engine torsional vibration reaches the vibration frequency threshold, the servo motor is controlled to increase the current input, so that the magnetic force amplitude of the iron core group on the yoke iron group is increased, the permanent magnet coupling area is increased, the torsional stiffness of the second secondary flywheel is adjusted, and the second secondary flywheel is stabilized; After the servo motor is controlled to increase the current input, if the vibration frequency of the engine torsional vibration is lower than the vibration frequency threshold, the servo motor is controlled to reduce the current input.

[0013] The beneficial effects of the technical solution of the present invention are: 1. The electromagnetic stiffness-adjustable three-mass flywheel vibration reduction device described in the present invention innovatively integrates magnetic coupling, dynamic vibration absorber, electromagnetic induction and DMF vibration reduction principles, thereby realizing adjustable working frequency bandwidth of the vibration reduction device; by precisely controlling the coupling area of ​​the permanent magnet to adjust the torsional stiffness, the narrow frequency band of the DMF and the narrow frequency band and limited size problems of the existing vibration absorber are solved; by actively controlling the size of the magnetic force, the vibration absorber can adapt to various working conditions, effectively reduce torsional vibration, extend the working life, and improve the applicability of the vibration reduction device, which makes up for the defects of the existing technology and has a high application value.

[0014] 2. The control method described in the present invention can call the functional modules in an orderly manner, thereby realizing the control logic of the electromagnetic stiffness adjustment three-mass flywheel vibration reduction device described in the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the electromagnetic stiffness adjustment three-mass flywheel vibration reduction device according to Example 1 of the present invention; Figure 2 It is a schematic diagram of the exploded structure of the electromagnetic stiffness adjustment three-mass flywheel vibration reduction device described in Example 1 of the present invention; Figure 3 Schematic diagram of the working principle of the vibration reduction structure of the electromagnetic stiffness adjustment three-mass flywheel vibration reduction device according to Example 1 of the present invention; Figure 4 Schematic diagram of a vibration reduction model of the electromagnetic stiffness adjustment three-mass flywheel vibration reduction device according to Example 1 of the present invention; Figure 5 is a logic flow diagram of the control method described in Example 2 of the present invention; The symbols in the accompanying drawings are explained as follows: 1. The first mass component; 201, first secondary flywheel; 202, bearing; 203, first inertia disk; 204, second secondary flywheel; 205, iron core; 206, winding coil; 207, fixing pin; 301, second inertia disk; 302, yoke iron; 401, servo motor; 402, slip ring; 403, brush. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0018] In the description of the present invention, it should be noted that the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0019] The terms "first", "second", etc. in the specification and claims of this article and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of this article described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0020] Embodiment 1: This embodiment provides an electromagnetic stiffness adjustment three-mass flywheel vibration reduction device, such as Figure 1~Figure 4 As shown, it includes: a first mass component 1, a second mass component, an electromagnetic induction component arranged on the second mass component, a third mass component arranged between the first mass component 1 and the second mass component, and a control mechanism arranged on one side of the second mass component; Further, the first mass component 1 is the primary mass component of the dual mass flywheel mechanism, which is not an innovative component of the present invention and will not be described in detail here. It is composed of a primary flywheel, a force transmission plate, an arc spring and other components; the improvement of the present invention is that the secondary mass component of the dual mass flywheel mechanism is modified, and its flywheel is divided into a first secondary flywheel 201 and a second secondary flywheel 204; the first secondary flywheel 201 is parallel to the first mass component 1 and fixed on the first mass component 1 as a part of the first mass component 1; wherein, the first secondary flywheel 201 is provided with circular holes arranged circumferentially, and the first secondary flywheel 201 is aligned and connected with the rivets on the first mass component 1 through the circular holes; the engine output shaft is connected to the first mass component 1, and the power of the engine is transmitted to the second mass component and the third mass component in sequence through the first mass component 1, and the center of the circle of the first mass component 1 is an axially extending transmission shaft, and the transmission shaft passes through the first secondary flywheel 201.

[0021] Further, the second mass component mainly includes: a second secondary flywheel 204, a first inertia disc 203 and a fixing pin 207; the second secondary flywheel 204 is arranged in parallel with the first secondary flywheel 201, and is sleeved on the transmission shaft of the first secondary flywheel 201, and a gap is provided between the second secondary flywheel 204 and the first secondary flywheel 201; the center of the second secondary flywheel 204 and the end of the transmission shaft of the first secondary flywheel 201 are fixed to each other by using a fixing pin 207; the first inertia disc 203 is arranged in parallel with the first secondary flywheel 201, and the transmission sleeve is arranged on the transmission shaft of the first secondary flywheel 201 and is located between the first secondary flywheel 201 and the second secondary flywheel 204, and a certain gap is also provided between the first inertia disc 203 and the first secondary flywheel 201.

[0022] Further, the third mass component mainly includes: a second inertia disc 301 and a plurality of yokes 302; the second inertia disc 301 is parallel to the first secondary flywheel 201, and the transmission sleeve is arranged on the transmission shaft of the first secondary flywheel 201, and the second inertia disc 301 is located between the first secondary flywheel 201 and the first inertia disc 203; in order to reduce the axial size of the device, the first inertia disc 203 and the second inertia disc 301 are provided with corresponding and matching circular grooves, and the two are aligned through the matching circular grooves, and the coaxial connection is achieved by arranging the bearing 202 in the groove to support coaxial rotation; wherein, the plurality of yokes 302 are evenly distributed along the inner side wall of the second inertia disc 301 around the center of the second inertia disc 301; and a distance is provided between two adjacent yokes 302.

[0023] Furthermore, the electromagnetic induction component mainly includes: a winding coil 206 and a plurality of iron cores 205; the plurality of iron cores 205 are arranged around the edge of the second secondary flywheel 204 and are evenly distributed; the iron cores 205 correspond to the yoke 302 one by one, and have the same axial thickness; when the device is not working, adjacent iron cores 205 and yoke 302 are radially distributed and there are gaps; the winding coil 206 is also arranged around the edge of the second secondary flywheel 204, and connects the plurality of iron cores 205 to each other, and the winding coil 206 finally connects the plurality of iron cores 205 and leads out two electrodes for electrical connection with the control mechanism.

[0024] Furthermore, the control mechanism mainly includes: a servo motor 401, a collector ring 402 and a brush 403; the conductive collector ring 402 is sleeved on the end of the fixing pin 207, and there are two collector rings 402; the two electrodes of the winding coil 206 are always in contact with the collector ring 402; the brush 403 is connected to the collector ring 402, the servo motor 401 is arranged at the proximal end of the second secondary flywheel 204, and the servo motor 401 is connected to the brush 403 for power supply; when the device is in operation, the magnetic amplitude of the yoke 302 by the iron core 205 is adjusted by controlling the current of the servo motor 401, thereby realizing the adjustment of the torsional stiffness, and finally realizing the flexible adjustment of the working frequency and a more effective vibration reduction effect.

[0025] In summary, if Figure 3 and Figure 4 As shown, after the original arc spring part in the first mass component 1M1 / J1 and the second mass component M2 / J2 initially attenuates the vibration, the present invention realizes adaptive control of the vibration reduction effect based on the magnetic coupling principle between the second mass component M2 / J2 and the third mass component M3 / J3, thereby helping the vibration reduction device to flexibly adapt to different working conditions of the automobile, thereby improving the vibration reduction effect and application range; the specific principles of the present invention are as follows: Preset a vibration frequency threshold; When the engine generates torsional vibration when doing work and transmits it to the first mass component 1, there will be a large torsional vibration phenomenon. At this time, the servo motor 401 is not started to intervene, but the torsional vibration is attenuated to a certain extent based on the adjustment of the arc spring inside the first mass component 1 and the second mass component; When the vibration frequency of the torsional vibration phenomenon reaches the vibration frequency threshold, it is determined that active vibration reduction intervention is required for this torsional vibration phenomenon; at this time, the servo motor 401 is controlled to start, and the current input is increased to increase the magnetic amplitude of the iron core 205 on the yoke 302, thereby increasing the permanent magnet coupling area, adjusting the torsional stiffness of the second secondary flywheel 204, and then stabilizing the secondary flywheel and attenuating the vibration, so that the power is smoothly transmitted to the subsequent components; After the above operation, when the vibration frequency of the torsional vibration phenomenon is lower than the vibration frequency threshold, the servo motor 401 is controlled to reduce the current input, thereby reducing the magnetic amplitude of the iron core 205 on the yoke 302, reducing the permanent magnet coupling area, adjusting the torsional stiffness of the second secondary flywheel 204, and then performing adaptive control of the vibration reduction effect according to the vibration frequency of the torsional vibration phenomenon.

[0026] It should be noted that the above examples are only for explaining the present invention and cannot limit the protection scope of the present invention.

[0027] Embodiment 2, this embodiment is based on the same inventive concept as the electromagnetic stiffness adjustment three-mass flywheel vibration reduction device described in Embodiment 1, and provides a control method, such as Figure 5 As shown, the following steps are included: S100, presetting a vibration frequency threshold; S200: When the engine generates torsional vibration and transmits it to the first mass component, there will be a large torsional vibration phenomenon. At this time, the servo motor is not started to intervene, but the torsional vibration is attenuated to a certain extent based on the adjustment of the arc spring inside the first mass component and the second mass component; S300, when the vibration frequency of the torsional vibration phenomenon reaches the vibration frequency threshold, it is determined that active vibration reduction intervention is required for this torsional vibration phenomenon; at this time, the servo motor is controlled to start, and the current input is increased to increase the magnetic force amplitude of the iron core on the yoke iron, increase the coupling area of ​​the permanent magnet, adjust the torsional stiffness, and then stabilize the secondary flywheel and attenuate the vibration, so that the power is smoothly transmitted to the subsequent components; S400. After the above operations are performed, when the vibration frequency of the torsional vibration phenomenon is lower than the vibration frequency threshold, the servo motor is controlled to reduce the current input, thereby reducing the magnetic force amplitude of the iron core on the yoke iron, reducing the coupling area of ​​the permanent magnet, adjusting the torsional stiffness, and then performing adaptive control of the vibration reduction effect according to the vibration frequency of the torsional vibration phenomenon.

[0028] Different from the prior art, the electromagnetic stiffness-adjustable three-mass flywheel vibration reduction device and control method of the present application can innovatively integrate magnetic coupling, dynamic vibration absorber, electromagnetic induction and DMF vibration reduction principles, thereby realizing adjustable working frequency bandwidth of the vibration reduction device; by precisely controlling the coupling area of ​​the permanent magnet to adjust the torsional stiffness, the problems of narrow DMF frequency band and narrow frequency band and limited size of existing vibration absorbers are solved; by actively controlling the size of the magnetic force, the vibration absorber can adapt to various working conditions, effectively reduce torsional vibration, extend the working life, and improve the applicability of the vibration reduction device, which makes up for the defects of the prior art and has high application value.

[0029] It should be understood that in the various embodiments of this document, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0030] It should also be understood that in the embodiments of this article, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0031] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this article.

[0032] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific logical process of the method described above can refer to the corresponding working processes of the systems, devices and units in the aforementioned method embodiments, and will not be repeated here.

[0033] In the several embodiments provided herein, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or can be electrical, mechanical or other forms of connection.

[0034] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of this article.

[0035] In addition, each functional unit in each embodiment of this invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional unit.

[0036] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An electromagnetic stiffness adjustment three-mass flywheel vibration reduction device, characterized in that: include: A first mass component (1), a second mass component, an electromagnetic induction component arranged on the second mass component, a third mass component arranged between the first mass component (1) and the second mass component, and a control mechanism arranged on one side of the second mass component; The electromagnetic induction component is used to cooperate with the third mass component to produce a magnetic coupling effect, and change the torsional stiffness of the second mass component through the magnetic coupling effect, so as to reduce the torsional vibration degree of the second mass component through the change of the torsional stiffness; The control mechanism is used to control the magnetic coupling strength between the electromagnetic induction component and the third mass component.

2. The electromagnetic stiffness adjustment three-mass flywheel vibration reduction device according to claim 1 is characterized in that: The first mass component (1) is provided with a first secondary flywheel (201) parallel to the first mass component (1); The second mass component comprises: a second secondary flywheel (204) and a first inertia disc (203); the second secondary flywheel (204) is parallel to the first secondary flywheel (201) and is sleeved on the transmission shaft of the first secondary flywheel (201), a gap is provided between the second secondary flywheel (204) and the first secondary flywheel (201), and the center of the second secondary flywheel (204) and the end of the transmission shaft of the first secondary flywheel (201) are fixed to each other by using a fixing pin (207); the first inertia disc (203) is arranged parallel to the first secondary flywheel (201), and the first inertia disc (203) is transmission sleeved on the transmission shaft of the first secondary flywheel (201) and is located between the first secondary flywheel (201) and the second secondary flywheel (204), and a gap is provided between the first inertia disc (203) and the first secondary flywheel (201); The third mass component comprises: a second inertia disc (301) and a yoke group; the second inertia disc (301) is arranged parallel to the first secondary flywheel (201), and the second inertia disc (301) is transmission-sleeved on the transmission shaft of the first secondary flywheel (201), and the second inertia disc (301) is located between the first secondary flywheel (201) and the first inertia disc (203); the first inertia disc (203) and the second inertia disc (301) are coaxially connected and support coaxial rotation; the yoke group is evenly distributed along the inner side wall of the second inertia disc (301) and around the center of the second inertia disc (301).

3. The electromagnetic stiffness adjustment three-mass flywheel vibration reduction device according to claim 2 is characterized in that: The electromagnetic induction component comprises: a winding coil (206) and an iron core group; The iron core group is arranged along and around the edge of the second secondary flywheel (204), and the iron core group is evenly distributed; The iron core group and the yoke group correspond to each other, and the axial thickness of the iron core (205) in the iron core group and the yoke (302) in the yoke group are consistent; in a non-working state, the iron core (205) in the iron core group and the yoke (302) in the yoke group are radially distributed and there is a gap; The winding coil (206) is arranged around the edge of the second secondary flywheel (204), the winding coil (206) is connected to the iron core group, and the winding coil (206) leads out two electrodes and is electrically connected to the control mechanism.

4. The electromagnetic stiffness adjustment three-mass flywheel vibration reduction device according to claim 3 is characterized in that: The control mechanism comprises: a servo motor (401), a collector ring (402) and a brush (403); The collector ring (402) is sleeved on the end of the fixing pin (207), and the two electrodes of the winding coil (206) are in contact with the collector ring (402); The brush (403) is connected to the slip ring (402); The servo motor (401) is arranged at the proximal end of the second secondary flywheel (204), and the servo motor (401) is connected to the brush (403) for power supply; The servo motor (401) is used to supply power to the core group via the brush (403); the servo motor (401) changes the magnetic force amplitude of the core group on the yoke iron group based on the adjustment of the current; the core group changes the torsional stiffness of the second secondary flywheel (204) based on the adjustment of the magnetic force amplitude.

5. A control method, used in the electromagnetic stiffness adjustment three-mass flywheel vibration reduction device according to any one of claims 1 to 4, characterized in that: The control method comprises the following steps: Preset vibration frequency threshold; When the engine torsional vibration is transmitted to the first mass component, the torsional vibration is attenuated based on the internal structures of the first mass component and the second mass component; When the vibration frequency of the engine torsional vibration reaches the vibration frequency threshold, the servo motor is controlled to increase the current input, so that the magnetic force amplitude of the iron core group on the yoke iron group is increased, the permanent magnet coupling area is increased, the torsional stiffness of the second secondary flywheel is adjusted, and the second secondary flywheel is stabilized; After the servo motor is controlled to increase the current input, if the vibration frequency of the engine torsional vibration is lower than the vibration frequency threshold, the servo motor is controlled to reduce the current input.

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