Principium

 Improvements in steppers with magnetic liquids can be realized in two ways; either by incorporating magnetic liquid directly into a stepper or by attaching a magnetic liquid viscous inertia damper to the shaft.  magnetic liquid inertia dampers are predominately used to smooth the incremental motion of stepper motors, digital devices controlled by a microprocessor that convert electrical pulses into precise mechanical movements. The levitation properties of a magnetic liquid are the basis of this commercial product. Unwanted oscillations are removed from the system by the viscous shearing of a film of magnetic liquid, thus transferring most of the mechanical energy into heat. In the selection of the magnetic liquid damper, the inertia of the damper was matched to the system load. The damping coefficient was then adjusted by changing the viscosity of the magnetic liquid until a proper system response was achieved. The settling time of the system with the magnetic liquid damper was reduced by more than a factor of two.

Application

• high precision  transport device   
• medical instrument
• other device need high speed & high precision

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