PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
A scientist at the University of Utah testing the torque of a micromotor using a micro-dynamometer. The micromotor is located at the top of the central supporting cylinder, its core is about the same thickness as the supporting wire seen above it. Micromotors such as these are made by scaled- down traditional methods, producing motors that are about 0.5mm in diameter and a few millimetres long. The core rotates loosely within a cylinder of armature wires, giving low friction and wear and leading to their generic name 'wobble motors'. Such motors have demonstrated torques of 30 dyne cm ( 3 millionths of a Newton metre), and have run for over 10 billion rotations before failure.
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