Haptic actuator using magnetorheological elastomer and magnetorheological fluid

Patent metadata

Field	Value
Publication number	US-2025207654-A1
Application number	US-202418409998-A
Country	US
Kind code	A1
Filing date	Jan 11, 2024
Priority date	Dec 21, 2023
Publication date	Jun 26, 2025
Grant date	—

Abstract

The present invention relates to a haptic actuator using a magnetorheological elastomer and a magnetorheological fluid, which has a shape in which a magnetorheological elastomer surrounds a ferrous elastomer and a magnetorheological fluid, the haptic actuator being capable of providing kinesthetic feedback related to an external force by increasing rigidity of the magnetorheological elastomer and increasing viscosity of the magnetorheological fluid, and capable of providing vibration feedback by generating vibration by being repeatedly compressed and restored in shape when an alternating current magnetic field is applied.

First claim

What is claimed is:

1 . A haptic actuator using a magnetorheological elastomer and a magnetorheological fluid, the haptic actuator comprising:
a magnetorheological elastomer housing ( 110 ) having a hollow portion ( 111 ) therein; an elastomer ( 120 ) provided in the magnetorheological elastomer housing ( 110 ); and a magnetorheological fluid ( 130 ) with which the hollow portion ( 111 ) is filled, wherein when an external magnetic field is applied, rigidity of the magnetorheological elastomer housing 110 increases, and viscosity of the magnetorheological fluid ( 130 ) increases, such that a resistive force against an external force increases, and wherein when an external alternating current magnetic field is applied, the magnetorheological elastomer housing ( 110 ) generates vibration while being repeatedly compressed and restored in a direction in which the external magnetic field is applied.

2 . The haptic actuator of claim 1 , wherein the magnetorheological elastomer housing ( 110 ) has a cylindrical shape having a hollow portion therein.

3 . The haptic actuator of claim 1 , wherein the magnetorheological elastomer housing ( 110 ) has a hollow portion therein and is formed to have a size corresponding to an area of a sole of a shoe.

4 . The haptic actuator of claim 3 , wherein the elastomer ( 120 ) is provided as a plurality of elastomers ( 120 ) provided in the hollow portion ( 110 ) inside the magnetorheological elastomer housing ( 110 ) having a size corresponding to the area of the sole of the shoe.

5 . The haptic actuator of claim 4 , wherein when a magnetic field is locally generated from a particular external magnetic field generation device among a plurality of external magnetic field generation devices provided in an entire region of the sole of the shoe, rigidity and viscosity of the magnetorheological elastomer housing ( 110 ) and the magnetorheological fluid ( 130 ) are locally increased in a region adjacent to a region in which the corresponding magnetic field is generated.

6 . The haptic actuator of claim 1 , wherein the magnetorheological elastomer housing ( 110 ) is provided as a plurality of magnetorheological elastomer housings ( 110 ) corresponding to an area of a sole of a shoe.

7 . The haptic actuator of claim 1 , wherein upper and lower sides of the elastomer ( 120 ) adjoin upper and lower surfaces in the magnetorheological elastomer housing ( 110 ).

8 . The haptic actuator of claim 1 , wherein when the external magnetic field is applied, iron particles in the magnetorheological fluid ( 130 ) are vertically aligned between parts of the elastomer ( 120 ) and hinder compression of the elastomer ( 120 ).

9 . The haptic actuator of claim 1 , wherein when the external alternating current magnetic field is applied, a partial region of the magnetorheological elastomer housing ( 110 ) is compressed in a direction in which the external alternating current magnetic field is applied, and
wherein when the direction in which the external alternating current magnetic field is applied is changed, a process in which a shape of the magnetorheological elastomer housing ( 110 ) is restored to an original shape by an elastic force of the elastomer ( 120 ) is repeated.

10 . The haptic actuator of claim 1 , wherein when an external force is applied in a direction from an upper side to a lower side in a state in which no external magnetic field is applied, the magnetorheological elastomer housing ( 110 ) is compressed downward and deformed in shape, such that a height of the magnetorheological elastomer housing ( 110 ) is reduced, and a lateral surface of the magnetorheological elastomer housing ( 110 ) extends outward while being compressed downward.

Assignees

• Univ Korea Ind Univ Coop Found

Inventors

• Heo Yong Hae
• Song Yuk Gwon
• Kim Sang Youn

Classifications

• H01F1/447

  characterised by magnetoviscosity, e.g. magnetorheological, magnetothixotropic, magnetodilatant liquids (electrorheological fluids C10M171/001) · CPC title

• G06F3/016 Primary

  Input arrangements with force or tactile feedback as computer generated output to the user · CPC title

• F16F2224/043

  electrorheological · CPC title

• F16F2222/12

  Fluid damping · CPC title

• F16F9/535 Primary

  Magnetorheological [MR] fluid dampers (springs comprising magnetorheological [MR] elastomers F16F1/361) · CPC title