CN116641981A

CN116641981A - Electromagnetic inertial actuator

Info

Publication number: CN116641981A
Application number: CN202310503107.7A
Authority: CN
Inventors: 肖光辉; 张弯弓; 唐荣; 查国涛; 贺才春; 侯振华; 丁行武
Original assignee: Zhuzhou Times New Material Technology Co Ltd
Current assignee: Zhuzhou Times New Material Technology Co Ltd
Priority date: 2023-05-06
Filing date: 2023-05-06
Publication date: 2023-08-25

Abstract

The application provides an electromagnetic inertial actuator, which is characterized in that a permanent magnet, an inner yoke and an outer yoke are fixedly connected by a non-magnetic retainer, so that ampere force is only generated in a magnetic circuit system, and good output linearity of the actuator is ensured. On the basis, the disc-shaped reed with quasi-zero rigidity characteristic is arranged, the natural frequency of the system is reduced, and the low-frequency output performance is ensured. The permanent magnet, the inner yoke, the outer yoke, the end cover and the heat radiating device are integrally designed, so that the rotor mass of the large inertial actuator is formed, the effective mass of the actuator is improved to the greatest extent, and the ratio of the partial mass to the total mass is large. The low-frequency output and the output value of unit mass can be improved, the total volume and the mass of the inertial actuator can be effectively reduced, and the installation space can be saved; meanwhile, the low-frequency vibration displacement of the inertial actuator can be effectively reduced by increasing the mass of the rotor, and the realization and stability of the quasi-zero stiffness characteristic can be further ensured.

Description

Electromagnetic inertial actuator

Technical Field

The application relates to the technical field of active vibration reduction, in particular to an electromagnetic inertial actuator.

Background

Along with the continuous development of science and technology, the requirements of people on vibration control are also higher and higher. However, the conventional passive control technology has the advantages of simple structure, easy realization and the like, but the control effect cannot be further improved at present, and the requirements of people are difficult to completely meet. The active vibration control can adapt to the change of the disturbance frequency and has good control effect, and the active vibration control is becoming the development trend of the vibration control technology. The vibration active control means that in the vibration control process, a certain control strategy is applied according to the detected vibration signal, and the actuator is driven to exert a certain influence on a control target through real-time calculation, so that the purpose of inhibiting or eliminating vibration is achieved.

Actuators are key components for active control, and are important links in an active control system, and function to apply a control force to a control object according to a determined control law to change the vibration response of the system. The working principle of the inertial actuator is that the inertial actuator is used as one of actuators, and is also called as an active vibration absorber, and the inertial actuator is powered by the outside to convert electric energy into mechanical energy, so that the moving mass of the inertial actuator reciprocates to generate a driving force with a certain amplitude, frequency and phase, and the driving force is applied to the moving mass of the main system to offset the exciting force received by the moving mass of the main system, thereby inhibiting the vibration of the main system. The types of inertial actuators that have been used in many applications today are mainly piezoelectric, magnetostrictive and electromagnetic. The electromagnetic type hydraulic control device has the advantages of quick response, simple structure, large actuating force, small driving current, wide application range and the like, and is widely applied to the field of active control. The electromagnetic inertial actuators are divided into a moving magnet type and a moving coil type, wherein the moving coil is used as an inertial mass, and the moving magnet is used as an inertial mass. The inertial mass of the moving-magnet inertial actuator is easy to be large, so that the output of the actuator is ensured to be large in inertial force.

The electromagnetic actuator comprises a stator and a rotor, wherein the stator part comprises an excitation coil, the rotor part comprises a permanent magnet and a magnetic conduction plate, after the rotor part is electrified, the excitation coil receives ampere force action in a magnetic field, when current is electrified as alternating current, the ampere force acts in an up-down direction to push the rotor part to vibrate up and down to form inertia force, and the inertia force is counteracted with external excitation force received by a controlled object, so that the purpose of inhibiting the vibration of the controlled object is achieved.

The following patents are related to electromagnetic actuators, as they were searched.

1. Patent name: resonance type linear spectrum inertial actuator, active control system and control method, application number: 201811589162.8 applicants: western university of traffic.

2. Patent name: a quasi-zero stiffness inertial actuator, application number: 201621422588.0 applicants: suzhou Dongshi Intelligent vibration and noise reduction technology Co., ltd.

3. Patent name: integrated inertial electromagnetic actuator, application number: 201410055324.5 applicants: harbin engineering university.

4. Patent name: moving-magnetic inertial actuator, application number: 201220498060.7 applicants: china Ship heavy industry group company, seventh institute.

5. Patent name: serial expansion inertial actuator, application number: 201721469528.9 applicants: western university of traffic.

6. Patent name: a butt-assembled integrated inertial actuator, with the application number: 201921136958.8 applicants: western university of traffic.

7. Patent name: a composite electromagnetic power vibration absorber, the application number is: 201922485495.2 applicants: zhongke Zhuangzhu (Suzhou) electronic technology Co., ltd.

8. Patent name: an electromagnetic active vibration absorber, application number: 202220432717.3 applicants: zhongke Zhuangzhu (Suzhou) electronic technology Co., ltd.

9. Patent name: an electromagnetic active vibration absorber, application number: 201720827826.4 applicants: wu Hanyuan Haibo technology Co., ltd.

10. Patent name: an electromagnetic active vibration absorber, application number: 201910859524.9 applicants: university of south China.

11. Patent name: vibratory acoustic compressor, application number: US19920904210a, applicant: HARMAN INT IND.

12. Patent name: force actuator with dual magnetic operation, application number: US19970998731a, applicant: MOTRAN IND INC.

13. Patent name: inertial voice type coil actuator, application number: US20040995145a, applicant: VINCENT STEPHEN S; KATZ ROBERT; DUCHESNE SYLVAIN.

From the analysis of the above patents, the following problems and disadvantages are common to the existing inertial actuator technology:

1) In the prior art, the natural frequency of the inertial actuator is higher, so that the low-frequency output is small, and the working frequency range of products is limited; or the prior art used in designing lower natural frequency inertial actuators can result in increased system volume, weight and complexity, as well as other adverse effects.

2) In the prior art, the unit volume and the mass of the inertial actuator are small in output, so that the set vibration reduction effect is expected to be achieved, the structure of the actuator is more complex, the volume and the weight are larger, and the practical application of products is limited.

3) In the prior art, the design of the magnetic circuit structure of the inertial actuator is unreasonable, so that the output linearity is poor, and the vibration active control effect is affected; and the moving magnetic type structure design is easy to cause the eccentric problem of the rotor, which causes difficult assembly. When the rotor and the stator are eccentric, collision can occur, the reliability of the equipment is reduced, friction can be generated during collision, vibration is brought, and the linearity of the force and the displacement deviates from an ideal value.

4) In the prior art, the inertial actuator lacks a heat dissipation device, so that the temperature rise is too high in the working process, the output performance of a product is limited, and the reliability of the product is influenced.

The 1 st patent of the 13 above patents discloses a resonant line spectrum inertial actuator, an active control system and a control method, which aim to lock the output vibration in the resonance area of the inertial vibrator by using a harmonic oscillator and obtain larger output force by smaller electromagnetic driving force. The structure of the rotor comprises a shell, a coil, a vibrator, a spring system with adjustable rigidity, a harmonic oscillator and a power amplifier, wherein the vibrator comprises a magnetic conduction plate, a permanent magnet, a guide pillar and a balancing weight, and the rotor mass is formed together. The 2) technical problem described above is solved. However, the technical scheme designs the inner yoke iron and the outer yoke iron into an integrated magnetic conduction structure (namely the integrated structure of the upper magnetic conduction plate, the middle magnetic conduction plate and the lower magnetic conduction plate), the magnetic circuit structure is subjected to electromagnetic attraction force generated by the electromagnet (the electromagnetic force is related to the current and the length of an air gap) besides ampere force, so that the rotor is eccentric, and the 3 rd technical problem occurs in the motion process of the rotor, and the force-displacement nonlinearity is presented. The 1 st patent reduces the natural frequency of the suspension system of the inertial actuator by the quasi-zero stiffness technology, thereby improving the low-frequency or even ultra-low-frequency output performance of the actuator and solving the 1 st technical problem. But the spring system adopting the Euler compression bar principle cannot be positioned radially, a linear bearing is additionally arranged for guiding, adverse effects of friction can be generated in the working process, and the volume and the complexity of the system are increased. None of the above-mentioned 13 patents address the 4) technical problem.

Disclosure of Invention

The application aims to solve the technical problems that the permanent magnet, the inner yoke and the outer yoke are fixed together to increase rotor mass to improve low-frequency output characteristics, but the output-displacement linearity is low, and the inherent frequency of an inertial actuator suspension system is reduced by a quasi-zero stiffness technology, but the structure is complex, so that the electromagnetic inertial actuator with high output value of unit mass of the rotor, high output-displacement linearity and quasi-zero stiffness characteristics and simple structure is provided.

The above object of the present application is achieved by the following technical solutions:

an electromagnetic inertial actuator comprises a rotor and a stator, wherein the rotor comprises a permanent magnet, an inner yoke and an outer yoke, and the stator comprises an exciting coil and a coil mounting frame; the inner yoke comprises an inner yoke I and an inner yoke II, and the inner yoke I, the permanent magnet and the inner yoke II are sequentially connected in series to form a rotor inner core; an outer yoke is radially surrounded on the inner core of the rotor, the outer yoke is connected with the inner core of the rotor through a retainer, and the retainer is made of non-magnetic conductive materials; the exciting coil is positioned between the outer yoke and the inner core of the rotor, and a gap is reserved among the exciting coil, the outer yoke, the inner core of the rotor and the retainer.

The following settings were made to make the force-displacement linearity high: 1. the inner yoke iron I, the permanent magnet and the inner yoke iron II are sequentially connected in series to form a whole, so that the structure of the part is stable; 2. the inner core of the rotor is fixedly connected with the outer yoke by a retainer, the exciting coil and the inner yoke and the outer yoke cannot be sucked together, and a gap between the inner yoke and the outer yoke is fixed; 3. the retainer is made of non-magnetic conductive materials, and the retainer cannot influence the magnetic circuit; the three points enable the magnetic circuit structure of the product to have ampere force effect only, so that the output linearity is high. And the gap between the inner yoke iron and the outer yoke iron of the product is fixed, so that the assembly formula is reliable.

Before being electrified, the permanent magnet generates a constant magnetic field and forms closed magnetic force lines along the inner yoke and the outer yoke. After the excitation coil is electrified, the excitation coil receives an ampere force action in a magnetic field, when the current is electrified as alternating current, the ampere force acts in an up-down direction alternately to push the rotor part to vibrate up and down to form an inertia force, the inertia force is transmitted to a controlled object through the center rod and counteracted with an external excitation force received by the controlled object, and therefore the purpose of inhibiting the vibration of the controlled object is achieved.

The permanent magnet is made of neodymium iron boron materials, and axial magnetization is selected. The outer yoke, the inner yoke I and the inner yoke II are made of DT4 electrical pure iron materials with high magnetic permeability. The retainer is made of non-magnetic materials such as high-strength aluminum or stainless steel. The exciting coil is formed by winding enamelled wires, and the winding directions of the enamelled wires of the upper coil and the lower coil are opposite, so that the opposite current directions in the electrified state are ensured.

Preferably, the first inner yoke, the permanent magnet and the second inner yoke are sequentially connected in series, are axially locked by a locking nut, and are fixed on the retainer.

Further, the stator further comprises a center rod, wherein two ends of the center rod are respectively fixed with a coil mounting frame, and two ends of the coil mounting frame are respectively fixed with an exciting coil; the center rod sequentially passes through the coil mounting frame, the active cell inner core and the coil mounting frame to be connected with the controlled object, wherein the center rod movably passes through the active cell inner core.

The stator includes a central rod that is not only part of the stator, but also serves to transmit vibrations. The center rod is used for installing the coil installation frame and transmitting vibration, so that the structure is compact, all parts of the stator are coiled in the outer yoke, the outer yoke is similar to a shell of the actuator, and the mass of the rotor is conveniently increased.

Further, the motor stator further comprises a quasi-zero stiffness device, wherein the quasi-zero stiffness device is a disc-shaped reed symmetrically arranged at two ends of the center rod, the center of the disc-shaped reed is fixed with the stator, and the edge of the disc-shaped reed is fixed with the rotor, so that the rotor is connected with the stator.

Further, the center of the disk-shaped reed is fixed with the center rod of the stator, and the edge of the disk-shaped reed is fixed with the outer yoke of the rotor.

The disc reed is used for realizing the quasi-zero rigidity characteristic of the actuator, the natural frequency of the inertial actuator is reduced, the low-frequency or even ultra-low-frequency output of the product is improved on the premise of not increasing the volume, the weight and the structural complexity, and the working frequency range is widened.

Further note that: the gap is formed between the inner core of the rotor and the central rod, but friction with the central rod can not occur when the rotor vibrates up and down. On the one hand, no magnetic attraction exists between the inner core of the rotor and the central rod; on the other hand, the disk-shaped reed is fixed to the center rod, and the disk-shaped reed is supported between the outer yokes, and the mover hardly generates eccentricity due to the disk-shaped reed having a large rigidity in the radial direction. Therefore, the application has compact and ingenious structure, good quasi-zero stiffness characteristic and higher output-displacement linearity.

Further, the height of the disk-shaped reed structureAnd a thickness ratio of

Further, the outer yoke iron is fixed between the upper end cover and the lower end cover; the disc-shaped reed, the stator and the rotor inner core are all positioned in a space surrounded by the upper end cover, the lower end cover and the outer yoke, wherein a central rod of the stator penetrates out of the lower end cover and is connected with a controlled object. The upper end cover and the lower end cover not only play a role in protection, but also are connected with the outer yoke, so that the upper end cover and the lower end cover are also part of the rotor, the rotor quality is increased, and the output value of the unit mass of the rotor is improved to a greater extent. Under the condition that the quasi-zero stiffness device is arranged in the electromagnetic type inertial actuator, the mover mass is increased, the low-frequency vibration displacement of the inertial actuator can be effectively reduced, and the realization and stability of the quasi-zero stiffness characteristic can be further ensured. The end covers in the application are an upper end cover and a lower end cover. The structure of the application is also ingenious in that the outer yoke can be connected with the upper end cover and the lower end cover due to the matched structure of the stator and the rotor, so that the end cover becomes a part of the rotor.

Further, the end face of the outer yoke, which is connected with the end cover, is L-shaped, and the protruding part of the L-shaped end face faces to the outer side; the matching part of the end cover and the outer yoke is of an inverted L shape correspondingly; the disc-shaped reed is arranged in a concave part of the L-shaped end face of the outer yoke, and the depth of the concave part of the L-shaped end face of the outer yoke is equal to the sum of the thickness of the edge of the disc-shaped reed and the thickness of the convex part of the inverted L-shaped end face of the end cover; the fastening piece penetrates through the end cover, the dish-shaped reed and the outer yoke iron to fixedly connect the end cover, the dish-shaped reed and the outer yoke iron. The outer yoke iron with the L-shaped end face and the protruding part of the L-shaped end face facing to the outer side has a limiting effect on the radial directions of the end cover and the disc spring, and is convenient for installing and positioning the end cover and the disc spring.

Further, a heat sink is fixed to the outer side of the outer yoke. The temperature of the product in the working process can be reduced, and the output performance and reliability of the product can be improved. And the rotor quality can be adjusted within a certain range by installing heat dissipation devices with different models and sizes, so that the product performance range is widened. Also, due to the structure of the present application, a heat dissipating device can be disposed outside the outer yoke. Preferably a removable heat sink.

Preferably, the heat dissipating device is a heat sink.

The permanent magnet, the inner yoke, the outer yoke, the end cover and the heat dissipation device are integrally designed, so that the rotor mass of the large inertial actuator is formed, the effective mass of the actuator is improved to the greatest extent, and the ratio of the partial mass to the total mass is large. The low-frequency output and the output value of unit mass can be improved, the total volume and the mass of the inertial actuator can be effectively reduced, and the installation space can be saved; meanwhile, the low-frequency vibration displacement of the inertial actuator can be effectively reduced by increasing the mass of the rotor, and the realization and stability of the quasi-zero stiffness characteristic can be further ensured.

The application has the following beneficial effects:

1) In order to solve the problem that the active vibration control effect is affected due to poor output linearity of the inertial actuator, the permanent magnet is fixed between the permanent magnet and the outer yoke by the retainer, a constant gap is kept, and the problem of eccentricity caused by the outer yoke caused by the permanent magnet in the installation process can be prevented. And the retainer structure adopts non-magnetic conductive materials such as high-strength aluminum or stainless steel, and the like, so that the magnetic circuit structure consisting of the permanent magnet and the inner yoke and the outer yoke can only be acted by ampere force F=BIL, wherein the force constant BL is generally constant after the structure is determined. Therefore, the electromagnetic thrust of the actuator is in linear relation with the current, and is irrelevant to the motion displacement, so that the output linearity of the inertial actuator is greatly improved. And the gap between the inner yoke iron and the outer yoke iron of the product is fixed, so that the eccentric phenomenon is not easy to occur, and the assembly is convenient and reliable.

2) In order to solve the problems that the natural frequency of an inertial actuator suspension system is higher, low-frequency output is small, and the working frequency range of products is limited, the application adopts a disc-shaped reed structure to realize the quasi-zero stiffness characteristic, reduces the natural frequency of the inertial actuator, improves the low-frequency output and even ultralow-frequency output of the products on the premise of not increasing the volume, the weight and the structural complexity, and widens the working frequency range.

3) In order to solve the problems of complex structure and large volume caused by low output density of unit volume mass of an inertial actuator and limit engineering application of products, the application fixes parts of high-density materials such as a permanent magnet, an inner yoke, an outer yoke, an upper end cover, a lower end cover, a radiating fin and the like of the inertial actuator together through structural innovation design to jointly form a rotor part of the actuator, wherein the stator part only comprises a coil, a bracket and the like, thereby maximally increasing the rotor mass of the inertial actuator, improving the low-frequency output of products and the output value of unit volume mass, and having compact and high efficiency.

4) In order to solve the adverse effect on the product performance and service life caused by too high heat generation when the inertial actuator is electrified for a long time to work. According to the application, the radiating fins are arranged on the outer side of the outer armature of the actuator, and are stamping forming pieces with a plurality of groups of grid structures which are arranged perpendicular to the surface of the outer yoke, so that the structure is compact, and the radiating area is greatly increased. The radiating fin is connected to the surface of the outer yoke through a screw, so that the installation is very convenient. Meanwhile, a heat conducting medium is smeared between the heat radiating device and the outer yoke, so that the heat radiating speed and effect of the actuator are improved to the greatest extent. In addition, through installing the fin of different models size, can also realize that inertial actuator active cell quality is adjustable in certain within range, widened product performance scope.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Attached at

In the figure:

FIG. 1 is a schematic diagram of an electromagnetic inertial actuator structure.

Figure 2 is a graph of disc spring mechanics characteristics for different height to thickness ratio coefficients z.

Fig. 3 is a cross-sectional view of the magnetic circuit structure of the electromagnetic inertial actuator.

Figure 4 is a diagram of the diaphragm disc reed structure (front view).

Figure 5 is a diagram of the diaphragm disc reed structure (top view).

An outer yoke-1; an inner yoke iron 1-2; permanent magnet-3; exciting coil-4; a dish-shaped reed-5; an upper end cover-6; a first locking nut 7; locking nut II-8; a central rod-9; screw-10; a coil bracket-11; an inner yoke II-12; a holder-13; a heat sink-14; and a lower end cover-15.

Detailed Description

Embodiments of the application are described in detail below with reference to the attached drawings, but the application can be implemented in a number of different ways, which are defined and covered by the claims.

Example 1

As known from the background art, the electromagnetic inertial actuator in the prior art mainly has four problems, and the embodiment improves the structure of the actuator, so that the actuator has higher output-displacement linearity, low-frequency output performance, higher output value of unit mass of a rotor and heat dissipation function. The specific improvement is as follows:

an electromagnetic inertial actuator comprises a rotor and a stator, wherein the rotor comprises a permanent magnet 3, an inner yoke and an outer yoke 1, and the stator comprises an exciting coil 4 and a coil mounting frame 11 as shown in figure 1; the inner yoke comprises an inner yoke I2 and an inner yoke II 12, wherein the inner yoke I2, the permanent magnet 3 and the inner yoke II 12 are sequentially connected in series to form a rotor inner core; the rotor inner core is radially surrounded by an outer yoke 1, the outer yoke 1 is connected with the rotor inner core through a retainer 13, and the retainer 13 is made of a non-magnetic conductive material; the exciting coil 4 is positioned between the outer yoke 1 and the mover inner core, and has a gap with the outer yoke 1, the mover inner core, and the holder 13. The permanent magnet 3 is made of neodymium iron boron material and is axially magnetized. The outer yoke 1, the inner yoke 2 and the inner yoke 12 are made of DT4 electrical pure iron materials with high magnetic permeability. The retainer 13 is made of a non-magnetic material such as high-strength aluminum or stainless steel. The exciting coil 4 is formed by winding enamelled wires, and the winding directions of the enamelled wires of the upper coil and the lower coil are opposite, so that the opposite current directions in the electrified state are ensured.

In the comparison document 1 described in the background art, when the current is supplied, the electromagnetic bag 8 and the magnetic conductive plate 10 generate electromagnetic attraction force to make the mover eccentric, so that the structure makes the mover exhibit force-displacement nonlinearity in the motion process. The application well solves the technical problem, and the following settings are carried out for the high output linearity: 1. the inner yoke iron I2, the permanent magnet 3 and the inner yoke iron II 12 are sequentially connected in series to form a whole, so that the structure of the part is stable; 2. the inner core of the rotor is fixedly connected with the outer yoke 1 through a retainer 13, the exciting coil 4 and the inner yoke 1 are not sucked together, and a gap between the inner yoke 1 and the outer yoke 1 is fixed; 3. the retainer 13 is made of non-magnetic conductive material, and the retainer 13 does not influence the magnetic circuit; the three points enable the magnetic circuit structure of the product to have ampere force effect only, so that the output linearity is high.

As shown in fig. 1, the inner yoke 2, the permanent magnet 3, and the inner yoke 12 are sequentially connected in series, are axially locked by the lock nut 7, and are fixed to the holder 13.

As shown in fig. 1, the stator further comprises a central rod 9, wherein two ends of the central rod 9 are respectively fixed with a coil mounting frame 11, and two ends of the coil mounting frame 11 are respectively fixed with an exciting coil 4; the center rod 9 sequentially passes through the coil mounting frame 11, the active cell inner core and the coil mounting frame 11 to be connected with the controlled object, wherein the center rod 9 movably passes through the active cell inner core.

The motor stator also comprises a quasi-zero stiffness device, wherein the quasi-zero stiffness device is disc-shaped reeds symmetrically arranged at two ends of the central rod 9, the center of each disc-shaped reed is fixed with the central rod 9 of the stator, and as shown in fig. 1, the center of each disc-shaped reed 5 is connected with a coil mounting frame 11 by using a locking nut II 8. The edge of the disk-shaped reed 5 is fixed with the outer yoke 1 of the mover. In order to solve the problems that the natural frequency of the suspension system of the inertial actuator is higher, the low-frequency output is small, and the working frequency range of products is limited, the application uses the disk-shaped reed 5 structure to suspend between the stator and the rotor of the inertial actuator, reduces the natural frequency of the products, and improves the low-frequency output performance (namely, improves the low-frequency output value). And the height and thickness ratio z of the disk-shaped reed structure is designed as

As shown in fig. 2, the mechanical characteristic curves of the disc-shaped reed with different height-thickness ratio coefficients are shown, λ1 represents the displacement amount of the disc-shaped reed 5 during operation, and P represents the load born by the disc-shaped reed 5. As can be seen from the mechanical characteristic curves of the disc springs with different height-thickness ratio coefficients z in FIG. 2, by matching and designing the parameters (rotor mass and disc reed stiffness) of the inertial actuator, the system motion displacement is in the range of A, B two points to realize the quasi-zero stiffness characteristic, and at the moment, the natural frequency of the inertial actuator is very low, so that the low-frequency output value of the inertial actuator can be effectively improved, and the working frequency range of products, particularly the low-frequency range, is widened.

As shown in fig. 2, the output in the frequency band below the natural frequency of the inertial actuator gradually decreases, so that the output value in the wide frequency band can be effectively increased by reducing the natural frequency as much as possible.

The disc-shaped reed, the coil mounting frame 11 and the active cell inner core are vertically arranged, and the outer yoke 1 surrounds the disc-shaped reed, the coil mounting frame 11 and the active cell inner core. Such a structure provides space for increasing the mass of the mover. The embodiment also comprises an upper end cover 6 and a lower end cover 15, and the outer yoke 1 is fixed between the upper end cover 6 and the lower end cover 15; the disc-shaped reed, the stator and the rotor inner core are all positioned in a space surrounded by the upper end cover 6, the lower end cover 15 and the outer yoke 1, wherein the center rod 9 of the stator penetrates out of the lower end cover 15 to be connected with a controlled object. The upper end cover 6 and the lower end cover 15 not only play a role in protection, but also are part of the rotor due to the structure connected with the outer yoke 1, so that the mass of the rotor is increased, and the output value of the unit mass of the rotor is improved to a greater extent.

The end face of the outer yoke 1 connected with the end cover is L-shaped, and the protruding part of the L-shaped end face faces to the outer side; the matching part of the end cover and the outer yoke 1 is of an inverted L shape correspondingly; the dish-shaped reed is arranged at the concave part of the L-shaped end face of the outer yoke iron 1, and the depth of the concave part of the L-shaped end face of the outer yoke iron 1 is equal to the sum of the thickness of the edge of the dish-shaped reed and the thickness of the convex part of the inverted L-shaped end face of the end cover; the end cover, the dish-shaped reed and the outer yoke 1 are fixedly connected by using a screw 10 to penetrate through the end cover, the dish-shaped reed and the outer yoke 1.

A heat sink 14 is fixed on the outer side of the outer yoke 1, and the heat sink, the outer yoke 1 and the retainer 13 are fixedly connected by sequentially penetrating through the heat sink, the outer yoke 1 and the retainer 13 by using fasteners. The rotor quality can be adjusted within a certain range by disassembling and assembling the radiating fins 14.

The rotor of the embodiment comprises an outer yoke 1, an inner yoke 2, a permanent magnet 3, an upper end cover 6, a first locking nut 7, a screw 10, an inner yoke 12, a retainer 13, a radiating fin 14 and a lower end cover 15. The stator comprises an exciting coil 4, a second locking nut 8, a central rod 9 and a coil bracket 11. The rotor and the stator are connected through a disc-shaped reed 5.

The application uses a non-magnetic retainer 13 to connect the permanent magnet 3, the inner yoke and the outer yoke 1, so that only ampere force exists in the magnetic circuit system, and good output linearity of the actuator is ensured. On the basis, a dish-shaped reed with quasi-zero rigidity characteristic is arranged, so that the low-frequency output performance is ensured. And because the inner core of the rotor and the central rod 9 have a gap, the outer yoke 1 is supported by the disc-shaped reed, and because the disc-shaped reed has larger rigidity in the radial direction, the rotor can hardly generate eccentricity, thereby maximally guaranteeing the stable gap between the inner yoke and the outer yoke 1, and the disc-shaped reed has the characteristic of quasi-zero rigidity and plays a supporting role. As can be seen from the figures of reference 1 and reference 2, the structure of the two actuators does not allow the end cap, the heat sink 14, to be part of the mover. The end cover and the radiating fin 14 become a part of the rotor by utilizing the structure of the actuator, and the part end cover not only has the function of the end cover, but also makes a contribution to the output value as the rotor. The heat sink 14 solves the problem of excessive temperature during long-term operation of the actuator, which affects the output performance and service life, and also contributes to the output value. The structure of the application makes the best of things, increases the effective mass of the active cell part of the inertial actuator to the greatest extent, and has compact and efficient structure. In addition, the inertial actuator is also provided with a disc-shaped reed structure according to the quasi-zero stiffness characteristic principle, and the structure of the application improves the low-frequency output value of products.

The inertial actuator of this embodiment is mounted on a vibration control object through a center rod 9, and before being energized, the permanent magnet 3 generates a constant magnetic field and forms closed magnetic lines along the inner and outer yokes 1, as shown in fig. 3. After the power is applied, the exciting coil 44 receives an ampere force in the magnetic field, when the power is applied as alternating current, the ampere force acts alternately in the up-down direction to push the mover part to vibrate up and down to form an inertia force, and the inertia force is transmitted to the controlled object through the center rod 9 and counteracted with an external exciting force received by the controlled object, so that the purpose of inhibiting the vibration of the controlled object is achieved.

The disc-shaped reed 5 structure adopted by the application can also adopt the disc-shaped reed 5 structure of the diaphragm shown in fig. 4 and 5, and the working principle and effect can achieve the same effect of the patent.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. An electromagnetic inertial actuator comprises a rotor and a stator, wherein the rotor comprises a permanent magnet, an inner yoke and an outer yoke, and the stator comprises an exciting coil and a coil mounting frame; the inner yoke comprises an inner yoke iron I and an inner yoke iron II, wherein the inner yoke iron I, the permanent magnet and the inner yoke iron II are sequentially connected in series to form a rotor inner core; an outer yoke is radially surrounded on the inner core of the rotor, the outer yoke is connected with the inner core of the rotor through a retainer, and the retainer is made of non-magnetic conductive materials; the exciting coil is positioned between the outer yoke and the inner core of the rotor, and a gap is reserved among the exciting coil, the outer yoke, the inner core of the rotor and the retainer.

2. The electromagnetic inertial actuator of claim 1, wherein the stator further comprises a central rod, a coil mounting bracket is fixed at each end of the central rod, and exciting coils are fixed at each end of the coil mounting bracket; the center rod sequentially passes through the coil mounting frame, the active cell inner core and the coil mounting frame to be connected with the controlled object, wherein the center rod movably passes through the active cell inner core.

3. The electromagnetic inertial actuator of claim 1, further comprising a quasi-zero stiffness device, the quasi-zero stiffness device being disc-shaped reeds symmetrically disposed at both ends of the central rod, the center of the disc-shaped reeds being fixed to the stator, the edges of the disc-shaped reeds being fixed to the mover, thereby connecting the mover to the stator.

4. The electromagnetic inertial actuator of claim 3, wherein the center of the disk-shaped reed is fixed to the center rod of the stator and the edge of the disk-shaped reed is fixed to the outer yoke of the mover.

5. The electromagnetic inertial actuator of claim 3, wherein the ratio of the height to the thickness of the disk-shaped reed structure is

6. The electromagnetic inertial actuator of claim 4, further comprising an upper end cap and a lower end cap, the outer yoke being secured between the upper end cap and the lower end cap; the disc-shaped reed, the stator and the rotor inner core are all positioned in a space surrounded by the upper end cover, the lower end cover and the outer yoke, wherein a central rod of the stator penetrates out of the lower end cover and is connected with a controlled object.

7. The electromagnetic inertial actuator according to claim 6, wherein an end face of the outer yoke to which the end cap is connected is L-shaped, and a portion of the L-shaped end face protruding toward the outside; the matching part of the end cover and the outer yoke is of an inverted L shape correspondingly; the disc-shaped reed is arranged in a concave part of the L-shaped end face of the outer yoke, and the depth of the concave part of the L-shaped end face of the outer yoke is equal to the sum of the thickness of the edge of the disc-shaped reed and the thickness of the convex part of the inverted L-shaped end face of the end cover; the fastening piece penetrates through the end cover, the dish-shaped reed and the outer yoke iron to fixedly connect the end cover, the dish-shaped reed and the outer yoke iron.

8. The electromagnetic inertial actuator of claim 6, wherein a heat sink is further secured to the outside of the outer yoke.

9. The electromagnetic inertial actuator of claim 8, wherein the heat sink is a heat sink.

10. The electromagnetic inertial actuator of claim 8, wherein the heat sink, outer yoke, and retainer are fixedly connected using fasteners passing sequentially through the heat sink, outer yoke, and retainer.