Eth Zurich

Bradley Kratochvil

Bradley Nelson

Dominic Frutiger

Karl Vollmers

Jake J Abbott

Simon Muntwyler

Dominik Bell

Jonas Baumann

Michael P Kummer

A magnetic manipulation and navigation system for moving a magnetic element through a body comprising at least six electromagnets with soft-magnetic cores arranged in a predetermined position to the body. One or more of the electromagnets operate in the non-linear regime of the magnetization curve of the cores. At least one magnetic field sensor is at one or more predetermined positions outside of the operating region. In the linear region, no feedback is required to set the magnetic field strength. In the non-linear region, feedback from the magnetic field sensors is used for closed-loop control. The system has an open loop mode operation in the linear regime for fast control signals, for stabilization during displacement of the magnetic element, and a closed-loop operation in the non-linear regime for higher field strengths, to apply forces and moments on the magnetic element while it is in contact with a surface.

Magnetic navigation system with soft magnetic core electromagnets for operation in the non-linear regime

A magnetic manipulation and navigation system for moving a magnetic element through a body comprising at least six electromagnets fixed in relation to said body and a control unit supplying the current for the electromagnets. The electromagnets have soft magnetic cores and the current supplied by the control unit to each of the electromagnets is adapted to operate the electromagnetic coils of each of the electromagnets in their core's linear regions being delimited by the value of the flux density of each electromagnet being in an interval between the negative and positive saturation value of each electromagnet, the lower representation showing the deviation due to the use of soft magnetic cores in all electromagnets.

Magnetic manipulation and navigation system for a magnetic element

A wireless resonant micro-actuator for untethered micro-robots. The wireless resonant micro-actuator includes at least two magnetic bodies that are resiliently connected to one another by a resilient member to form a spring-mass system. A magnetic field generator generates a pulsating or oscillating external magnetic field that creates a magnetic force between the at least two magnetic bodies. The at least two magnetic bodies are capable of being mechanically oscillated to resonance with respect to one another. A converter converts the oscillatory motion of the at least two magnetic bodies to create useful motion.

Wireless resonant magnetic acutation for untethered microrobots

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Zurich, Switzerland

Bradley Kratochvil