KR20200091513A - Magneto-rheological elastomer based vibration generator - Google Patents

Abstract

Provided is a vibration generating apparatus based on a magnetorheological elastic body, which comprises: the magnetorheological elastic body comprising a polymer elastic material and magnetic powder dispersed therein; a plurality of magnetic modules located on one side of the magnetorheological elastic body, and inducing vibration of the magnetorheological elastic body by applying a magnetic field; and a housing having the magnetic module coupled therein and blocking the magnetic field generated in each of the magnetic modules positioned adjacent to each other. According to the present invention, the vibration generating apparatus can improve interaction with a user by generating vibrations of various patterns.

Description

Magneto-rheological elastomer based vibration generator

The present invention relates to a vibration generating device based on a magnetorheological elastic body, and relates to a vibration generating device based on a magnetorheological elastic body capable of generating various patterns of vibration to expand interaction between a user and a device.

Smart material (Smart material) is a material whose properties change according to the controlled external conditions, it can exhibit properties suitable for a variety of applications, and has been actively researched recently.

The magnetorheological material (Magneto-rheological material) is characterized by the rheological properties of the magnetic field, mainly consisting of a non-magnetic material mixed with strong magnetic particles. The base nonmagnetic material may be formed in the form of a liquid (MRF; MR fluid) or a solid. In the form of a solid, a magnetorheological elastomer (MRE) is added with magnetic particles in a polymer elastic material such as natural rubber or silicone rubber. As described above, magnetic particles are arranged according to an external magnetic field, and thus, viscosity, stiffness, and elastic force are changed.

Therefore, due to the characteristics of the magnetorheological elastic body, technology development is being developed for application in fields such as suspensions of vehicles, mounting of mechanical parts, and actuators of game machines.

In the case of an actuator of a conventional game machine, only a simple vibration is transmitted using a piezoelectric sensor, and there may be limitations in transmitting various tactile sensations. Therefore, it is necessary to develop a technology for an actuator that applies the properties of a magnetorheological elastic body.

Korean Registered Patent No. 10-1279479 (Registration date: 2013. 06. 21.) Korean Registered Patent No. 10-1851702 (Registration date: 2018. 04. 18.)

SUMMARY OF THE INVENTION The object of the present invention is to provide a vibration generating device based on a magnetorheological elastic body capable of generating various patterns of vibration and improving user-device interaction.

In addition, another technical problem to be achieved by the present invention is to provide a vibration generating apparatus based on a magnetorheological elastic body capable of enhancing vibrations of various patterns through a combination of vibration of a permanent magnet and magnetorheological elastic body vibration.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above problems, the present invention is a magnetic rheological elastic body made of a polymer elastic material and magnetic powder dispersed therein; A magnetic driving module, which is located on one side of the magnetorheological elastic body but is composed of a set of driving cells that cause a vibration of the magnetorheological elastic body by applying a magnetic field; And a housing in which the driving cells are coupled, and blocks magnetic fields or noise generated in each of the driving cells positioned adjacent to each other, thereby providing a vibration generating device based on a magnetorheological elastic body.

The housing may be made of a magnetic material.

The magnetorheological elastic body may be provided in plural in correspondence with each of the driving cells.

Each of the plurality of magnetorheological elastic bodies may have a different content ratio of magnetic powder.

The magnetorheological elastic body may be connected to each other by one magnetorheological elastic body on the magnetic driving module.

The driving cell may be composed of a core and a coil surrounding it.

In the magnetic driving module, the number of coils of each driving cell is different from each other, and a different magnetic field may be formed for each driving cell for the same applied current.

The self-driving module includes a microcontroller connected to it, and the microcontroller can individually control the current applied to each driving cell.

The magnetic drive module includes a permanent magnet located on one side of the driving cell, and the housing may include a spring connected to the permanent magnet.

In the magnetic driving module, the permanent magnet may oscillate up and down according to the direction of voltage or current applied to the driving cell.

The vibrational growth value based on the magnetorheological elastic body according to the embodiment of the present invention can generate various patterns of vibration by applying a magnetic field generated in each of the driving cells of the magnetic drive module to the magnetorheological elastic body, thereby allowing the user to There is an advantage that the interaction of the device can be further improved. Furthermore, by providing a permanent magnet located on one side of the drive cell and a spring connected to it, vibration of the permanent magnet and magnetorheological elastic vibration are combined according to the direction of the applied current or voltage to enhance vibration of various patterns. There is an advantage.

1 is a perspective view showing a vibration generating apparatus based on a magnetorheological elastic body according to a first embodiment of the present invention,
Figure 2 is a cross-sectional view according to IIㅄ of Figure 1 showing the initial state of the vibration generating device based on the magnetorheological elastic body according to the first embodiment of the present invention,
3 is a cross-sectional view taken along line II′ of FIG. 1 showing a driving state of a magnetorheological elastic body-based vibration generating device according to a first embodiment of the present invention;
Figure 4 is a cross-sectional view showing a cross section of the drive cell before and after the application of current,
5 is a perspective view showing a vibration generating apparatus based on a magnetorheological elastic body according to a second embodiment of the present invention,
6 is a perspective view showing a vibration generating device based on a magnetorheological elastic body according to a third embodiment of the present invention,
Figure 7 is a cross-sectional view showing the initial state of Figure 5 or 6,
8 is a cross-sectional view showing a driving state of FIG. 5 or 6,
9 is a view showing a simulation of a magnetic field region of a vibration generating device based on a magnetorheological elastic body according to an embodiment of the present invention;
10 is a cross-sectional view showing a vibration generating apparatus based on a magnetorheological elastic body according to a fourth embodiment of the present invention,
11 is a cross-sectional view showing a driving method of a vibration generating device based on a magnetorheological elastic body according to a fourth embodiment of the present invention,
12 is a process flow chart showing a manufacturing process of a vibration generating device based on a magnetorheological elastic body according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided as examples to ensure that the spirit of the present invention can be sufficiently transmitted to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. In addition, in the drawings, the length and thickness of layers and regions may be exaggerated for convenience. Throughout the specification, the same reference numbers refer to the same components.

1 is a perspective view showing a vibration generating device based on a magnetorheological elastic body according to a first embodiment of the present invention, and FIG. 2 is a view showing an initial state of a vibration generating device based on a magnetorheological elastic body according to a first embodiment of the present invention 1 is a cross-sectional view taken along IIㅄ, FIG. 3 is a cross-sectional view taken along IIㅄ of FIG. 1 showing a driving state of a magnetorheological elastic body-based vibration generating device according to a first embodiment of the present invention, and FIG. Cross-sectional view showing a cross-section of a cell, Figure 5 is a perspective view showing a magnetorheological elastic body-based vibration generating device according to a second embodiment of the present invention, Figure 6 is a magnetorheological elastic body-based vibration generating device according to a third embodiment of the present invention 7 is a sectional view showing the initial state of FIG. 5 or 6, FIG. 8 is a sectional view showing the driving state of FIG. 5 or 6, and FIG. 9 is a magnetorheological elastic body based on the practice of the present invention. Fig. 10 is a sectional view showing a magnetic field region of a vibration generating device, and Fig. 10 is a sectional view showing a magnetorheological elastic body-based vibration generating device according to a fourth embodiment of the present invention, and Fig. 11 is a magnetic rheology according to a fourth embodiment of the present invention. Fig. 12 is a process flow chart showing a manufacturing process of a magnetorheological elastic body-based vibration generating device according to an embodiment of the present invention.

1 to 12, the vibrating growth value based on a magnetorheological elastic body according to an embodiment of the present invention is a magnetorheological elastic body (100, 100', 100", 1000), a magnetic driving module 200 and a housing 300 , 300', 300", 3000).

The magnetorheological elastic bodies 100, 100', 100", and 1000 may be made of a polymer elastic material 110 and a magnetic powder 120 dispersed therein. For example, the polymer elastic material 110 is a silicone rubber material. It may be made of, magnetic powder 120 may be made of a carbonyl iron (Carbonyl Iron) powder, as shown in Figure 1 or Figure 11, the magnetorheological elastic body (100, 1000), the driving cell 200a, 200b, 200c, 200d, 200e, 200f) may be provided separately in correspondence (100a, 100b, 100c, 100d, 100f), and may be provided in plurality. Furthermore, each of the plurality of magnetorheological elastic bodies 100a, 100b, 100c, 100d , 100f) may have different content ratios of the magnetic powder, and as shown in Fig. 5, the magnetorheological elastic body 100' corresponds to the unit set of the driving cells 200a, 200b, 200c, 200d, 200e, 200f. 6, it may be connected to each other by a magnetic rheological elastic body (100") on the magnetic drive module 200.

The magnetic driving module 200 is composed of a set of driving cells 200a, 200b, 200c, 200d, 200e, 200f, and the driving cells 200a, 200b, 200c, 200d, 200e, 200f are the magnetorheological elastic body 100 , 100', 100", 1000) but applying a magnetic field may cause vibration of the magnetorheological elastic bodies 100, 100', 100", 1000.

The magnetorheological elastic bodies (100, 100', 100", 1000) are randomly arranged in an irregular distribution before the application of the magnetic field, that is, in the initial state, and the soft elasticity can be sensed by tactile sense. When applied, that is, in the driving state, the magnetic powder 130 forms a chain according to a magnetic field and is regularly arranged to sense a tactile sensation than in the initial state.The magnetorheological elastic body 100 before and after application of the magnetic field , 100', 100", 1000), according to the arrangement of the magnetic powder 120, a height displacement difference (Y) through contraction and expansion occurs, which can be sensed by vibration according to height change along with a change in elasticity. . That is, the magnetic drive module 200 may provide magnetic energy for controlling the stiffness of the magnetorheological elastic bodies 100, 100', 100", and 1000, and the magnetism according to on/off of the applied current. As the periodic magnetic field changes of the driving module 200, that is, the magnetorheological elastic bodies 100, 100', 100", and 1000 are repeatedly contracted and expanded, the user can sense vibration.

The driving cells 200a, 200b, 200c, 200d, 200e, and 200f may be composed of a core 210 and a coil 220 surrounding it. Therefore, as shown in FIG. 3 or 8, a magnetic field may be generated according to the on/off of the current or voltage applied to each driving cell of the magnetic driving module 200, and thereby the magnetorheological elastic body connected to each driving cell may have a displacement difference. (Y) is formed and vibration may occur.

Furthermore, the magnetic drive module 200, the number of coils of each of the driving cells 200a, 200b, 200c, 200d, 200e, 200f is different from each other, and the driving cells 200a, 200b, 200c, 200d for the same applied current. 200e, 200f) may form different magnetic fields. Therefore, the magnetorheological elastic bodies 100, 100', 100", and 1000 positioned in correspondence with each driving cell may be repeatedly vibrated by different strengths and weaknesses of the elasticity according to a change in the magnetic field formed for each driving cell. The stronger the magnetic powder 120 is, the faster the arrangement and increase the arrangement, so as the size of the magnetic field increases, the magnetorheological elastic bodies 100, 100', 100", 1000 can sense a harder touch. Therefore, when a strong magnetic field and a weak magnetic field are applied to each driving cell in separate sizes, the magnetorheological elastic bodies (100, 100', 100", 1000) connected to them have different elastic strength or displacement difference (Y) for each position. It is configured, and it is possible to feel different vibrations for each position sensed by the user.

In addition, when a plurality of magnetorheological elastic bodies (100a, 100b, 100c, 100d, 100f) having different magnetic powder content ratios are provided, on/off of the magnetic field and changes in strength and weakness of the magnetic field and vibration parameters Since is further increased, various types of vibrations can be implemented.

Therefore, the vibration growth value based on the magnetorheological elastic body is applied to the magnetorheological elastic body 100, 100', 100", 1000 by applying various magnetic fields generated in each of the driving cells of the magnetic drive module 200 to the vibration of various patterns. It can be created, and the interaction between the user and the device can be further improved, for example, when applied to a game device, it is possible to sense immersive games by detecting changes in various vibrations. The vibration effect provided is divided into vibration coming to the fingertips and vibration coming to the entire hand, so it has the advantage of receiving more tactile feedback.

The magnetic drive module 200 includes a micro-controller connected to it, and the micro-controller can individually control the current applied to each driving cell, whereby the magnetorheological elastic body 100, 100', 100" , 1000) The vibration period and the magnitude of vibration can be controlled.

The microcontroller may include a vibration waveform generator or an amplifier to convert digital information provided by the MCU to an analog vibration waveform. For example, a vibration waveform generation and an amplifier can be configured using an 8-bit digital to analog converter (DAC), TLC7528LCN, OP-Amp, and NPN transistor. In order to continuously detect vibrations of the magnetorheological elastic bodies 100a, 100b, 100c, 100d, and 100f, it is preferable that the digital-to-analog converter has a delay of 180 ns or less on average to form a vibration period.

The housings 300, 300', 300", and 3000 are coupled to the driving cells 200a, 200b, 200c, 200d, 200e, 200f, respectively, to reduce the magnetic field or noise generated in each neighboring driving cell. The housing (300, 300', 300", 3000) may be made of a magnetic material to improve the performance of the magnetorheological elastic body-based vibration generating device by minimizing magnetic field loss. As shown in Figure 9, by providing the housing (300, 300', 300", 3000) of the magnetic body, it can be confirmed that the magnetic flux line of the closed circuit is formed between the driving cell and the magnetorheological elastic body (100, 100', 100"). It can be confirmed that the magnetic field loss is minimized. At this time, a cover 400 for sealing the magnetorheological elastic bodies 100, 100', and 100" and the magnetic drive module may be located on the upper portions of the housings 300, 300', and 300". The cover 400 may be made of a flexible thin film or thick film magnetic material so that a user can sense various touches or vibrations of the magnetorheological elastic bodies 100, 100', 100", and 1000 and minimize magnetic field loss. have.

10 or 11, the magnetic drive module 200 includes a permanent magnet (M) located on one side of the driving cell, and the housing (3000) is connected to the permanent magnet (M) It can be provided with a spring (S). In the magnetic driving module 200, the permanent magnet M may oscillate up and down according to the direction of voltage or current applied to the driving cell.

In detail, when an AC voltage is applied to the driving cell, a magnetic field is generated according to an input frequency, so that the magnetorheological elastic body 1000 can generate vibration by repeating contraction and expansion. In addition, the permanent magnet (M) located on one side of the driving cell and connected to the housing (3000) with a spring (S) may be subject to attraction or repulsion depending on the current or voltage applied to the driving cell. In addition, when applying a voltage or current in the direction in which the permanent magnet (M) and the attraction force are generated in the driving cell so that the permanent magnet (M) becomes closer to the magnetorheological elastic body (1000), the magnetic powder due to the permanent magnet (M) ( 120) is magnetized, the magnetorheological elastic body 1000 may slightly contract.

Referring to Figure 11, the initial state, that is, when there is no current or voltage applied, the permanent magnet (M) is positioned to maintain a certain distance on the top of the driving cell, and when the voltage is applied, the permanent magnet (M) is a magnetorheological elastic body The spring (S) is extended as it approaches (1000), and at the same time, the magnetorheological elastic body (1000) can contract. Then, while the current or voltage is being switched, the permanent magnet (M) returns to its original position and the spring (S) is restored, and after switching, the repulsive force between the permanent magnet (M) and the driving cell when the direction of the current or voltage is reversed As this occurs, the permanent magnet M moves in the opposite direction of the driving cell, so that the spring S can be reduced. When this process is repeated by applying an alternating voltage, the permanent magnet (M) receives the force up and down, thereby causing the spring (S) to undergo elastic movement, thereby generating vibration, and at the same time, contracting and contracting the magnetorheological elastic body (1000). Vibration due to expansion occurs, and two vibrations can be combined to generate strong vibrations. In addition, when a strong current or voltage is applied to the driving cell, a collision between the permanent magnet M and the driving cell may occur to generate even stronger vibration.

Accordingly, vibration may occur depending on the driving of the driving cell and the distance between the magnetorheological elastic body 1000 and the permanent magnet M, and the vibration and the permanent magnet M that the magnetorheological elastic body 1000 contracts and expands up and down. Combination of the moving vibrations can generate larger vibrations, and furthermore, it is possible to generate stronger vibrations by inducing a collision between the driving cell and the permanent magnet.

That is, by providing a permanent magnet (M) located on one side of the driving cell and a spring (S) connected to it, the vibration of the permanent magnet (M) and the magnetorheological elastic body (1000) according to the direction of the applied current or voltage ) There is an advantage that vibrations of various patterns can be enhanced by combining vibrations.

Referring to Figure 12, when explaining the manufacturing process of the vibration generating apparatus based on the magnetorheological elastic body according to an embodiment of the present invention, first, the material of the magnetic powder and the polymer elastic material is blended (S110). The compounding of the magnetic powder and the polymer elastic material may include, for example, a silicone rubber material and a carbonyl iron powder (CIP) compounded with a silicone oil, and the ratio of the silicone rubber material: CIP: silicone oil is 1:9. It may be formulated to be 1:1.

Next, the blended formulation is stirred (S120). For example, stirring the blend may be using a magnetic type impeller.

Thereafter, air bubbles are removed from the formulation (S130). When bubbles generated during the stirring process are contained in the magnetorheological elastic body, the smoothness of the surface may be lowered after the subsequent curing process, and due to the bubbles, the elastic force may be different for each magnetorheological elastic body, so that bubbles are removed after stirring. It is preferred. For example, air bubbles can be removed by placing the blend after stirring in a vacuum chamber for about 3 minutes.

Next, the mixture with the bubbles removed is inserted into the housing (S140). A driving cell may be located inside the housing, and a compound may be inserted into the upper part of the driving cell.

Thereafter, the formulation is cured (S150). For example, the housing in which the formulation is inserted may be placed in a chamber where a vacuum degree is maintained, and a curing process may be performed for about 5 hours while maintaining a temperature of 70 to 80 degrees.

After the curing process, a vibration generating device based on a magnetorheological elastic body may be completed.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You can understand that you can.

100, 100', 100", 1000; magnetorheological elastomer
110; Polymer elastic material
120; Ingredient
200; Self-driving module
200a, 200b, 200c, 200d, 200e, 200f; Driving cell
300, 300', 300", 3000; housing

Claims (10)

A magnetorheological elastic body made of a polymer elastic material and magnetic powder dispersed therein;
A magnetic driving module, which is located on one side of the magnetorheological elastic body but is composed of a set of driving cells that cause a vibration of the magnetorheological elastic body by applying a magnetic field; And
The drive cell is coupled to the inside, characterized in that it comprises a housing for blocking the magnetic field or noise generated in each of the adjacent neighboring drive cells, a magnetorheological elastic body-based vibration generating device.
According to claim 1,
The housing is a magnetic material, characterized in that made of a magnetic material, a vibration generating device based on a magnetorheological elastic body.
According to claim 1,
The magnetorheological elastic body, a vibration generating apparatus based on a magnetorheological elastic body, characterized in that provided separately in plurality in correspondence to each of the drive cells.
The method of claim 3,
Each of the plurality of magnetorheological elastic body is characterized in that the magnetic powder has a different content ratio of the magnetorheological elastic body-based vibration generating device.
According to claim 1,
The magnetorheological elastic body, a magneto-rheological elastic body-based vibration generating device, characterized in that connected to each other by a single magnetorheological elastic body on the magnetic drive module.
According to claim 1,
The driving cell is a magnetron rheostat-based vibration generating device, characterized in that consisting of a core and a coil surrounding it.
The method of claim 6,
The magnetic drive module, the number of coils of each of the driving cells are different from each other, and the magnetic current elastic body-based vibration generating device, characterized in that different magnetic fields are formed for each driving cell for the same applied current.
According to claim 1,
The magnetic drive module, including a micro-controller connected to it, the micro-controller is a magnetorheological elastic body-based vibration generating device, characterized in that individually controlling the current applied to each driving cell.
According to claim 1,
The magnetic drive module includes a permanent magnet located on one side of the driving cell, and the housing is a magnetorheological elastic body-based vibration generating device characterized in that it comprises a spring connected to the permanent magnet.
The method of claim 9,
The magnetic drive module, a vibration generating device based on a magnetorheological elastic body, characterized in that the permanent magnet vibrates up and down according to the direction of the voltage or current applied to the driving cell.

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