The present invention relates to a haptic information provision device. The haptic information provision device (100) according to the present invention comprises: a receiver (120) for receiving external notification information; a controller (130) for converting the notification information to a haptic signal; and an operation unit (110) for transferring haptic information to a user according to the haptic signal, wherein the operation unit (110) includes a plurality of operation units (110a-110j), the respective operation units (110a-110j) operating in response to different notification information and thus transferring different haptic information to the user.

A magnetorheological fluid utilizing properties of thixotropic agents and having well-balanced sedimentation properties includes: a magnetic material; a medium to allow the magnetic material to be dispersed therein; and at least one dispersant selected from sepiolite and smectite or a dispersant including sepiolite and bentonite.

There are provided a magnetic viscous fluid containing magnetic particles, a carrier fluid, and an organic molybdenum compound, in which a content of the magnetic particles is 35% by volume or more and 50% by volume or less with respect to a volume of the magnetic viscous fluid, a viscosity of the carrier fluid, which is measured with an electromagnetic rotary viscometer at a measurement temperature of 25° C., is 10 mPa.Math.sec or more, and a shear viscosity of the magnetic viscous fluid, which is measured at a shear rate of 1,000 sec.sup.-1 at a measurement temperature of 25° C., is 500 mPa.Math.sec or less, as well as a magnetic viscous fluid device including the magnetic viscous fluid and a production method for the magnetic viscous fluid.

A deformable mirror can include a reservoir containing a ferrofluid. The deformable mirror can also include a reflective face sheet covering a front side of the reservoir such that a back side of the reflective face sheet is exposed to the ferrofluid. The reflective face sheet can have a reflective surface on a front side of the reflective face sheet opposite the back side. The reflective face sheet can have a non-uniform thickness between the front and back sides of the reflective face sheet to provide stiffness for the reflective face sheet. In addition, the deformable mirror can include one or more electromagnets operable to generate a magnetic field that acts on the ferrofluid to deform the reflective face sheet. A deformable mirror system can further include a control system operably coupled to the one or more electromagnets to control the magnetic field and thereby a deformation of the reflective face sheet.

A rear wheel steering motor generates rotational force. A movement converter has a converting portion coupled to the wheel steering motor and configured to convert the rotational force transmitted from the rear wheel steering motor into a linear movement. An MR fluid is applied on the converting portion. An inverter controls driving of the rear wheel steering motor. A magnet switch works in concert with the inverter to change a magnetic field to selectively provide the magnetic field to the MR fluid of the movement converter.

A magnetorheological fluid is provided having a reduced coefficient of friction and favorable settling characteristics. The fluid contains magnetically responsive particles, a carrier fluid, and an amine oleate salt.

The invention is related to a soft-magnetic powder comprising coated particles, the coated particles comprising a core and a shell, the core having an average particle size D.sub.50 in a range from 0.1 μm to 100 μm and comprising iron, wherein the shell has a thickness of not more than 20 nm and comprises at least two solid oxides and wherein the shell comprises at least three layers and the shell comprises more than one layers of a first solid oxide and at least one layer of a second solid oxide, wherein the more than one layers of the first solid oxide and the at least one layer of the second solid oxide are arranged in an alternating manner. The invention is further related to a process for the production of the soft-magnetic powder, a use of the soft-magnetic powder and an electronic component comprising the soft-magnetic powder.

A power system has a power-electronic module that includes a housing defining a looped reservoir, a ferro-magnetic medium sealed within and filling the looped reservoir, and a conductor surrounded by the ferro-magnetic medium. The conductor is coiled within and along the looped reservoir, and has terminals extending out of the reservoir such that the ferro-magnetic medium and conductor form an inductor that opposes changes in magnitude of current flowing through the conductor.

In embodiments, a work vehicle magnetorheological fluid (MRF) joystick system includes a joystick device, an MRF joystick resistance mechanism, and a controller architecture. The joystick device includes, in turn, a base housing, a joystick movably mounted to the base housing, and a joystick position sensor configured to monitor movement of the joystick relative to the base housing. The MRF joystick resistance mechanism is controllable to vary a first joystick stiffness resisting movement of the joystick relative to the base housing in at least one degree of freedom. The controller architecture is configured to: (i) detect when unintended joystick motion conditions occur during operation of the work vehicle; and (ii) when detecting unintended joystick motion conditions, command the MRF joystick resistance mechanism to increase the first joystick stiffness in a manner reducing susceptibility of the joystick device to unintended joystick motions.

Provided are a reliable high-voltage system and a failure diagnosis method thereof, in which a vibration damping mechanism using an electrorheological fluid as a working fluid is a load, and can prevent electric shock due to leakage current and the influence on surrounding electronic devices. There are provided a first circuit that includes a power source and a ground, a second circuit that is magnetically coupled to the first circuit via a transformer and includes a load connected to the ground, a controller that is connected to the ground, a third circuit that is connected to the second circuit and the ground, a first resistor that is provided between a connection point at a high potential end of the second circuit and the ground, and a second resistor that is provided between a connection point at a low potential end of the second circuit and the ground, and has a resistance value different from a resistance value of the first resistor.