Single coil bistable, bidirectional micromechanical actuator

Details Single coil bistable, bidirectional micromechanical actuator Single coil bistable, bidirectional micromechanical actuator

1997-06-05

1998-09-15

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 42, 310DIG6, H02K 1500, H02K 5700

Patent

active

058083847

ABSTRACT:
Micromechanical actuators capable of bidirectional and bistable operation can be formed on substrates using lithographic processing techniques. Bistable operation of the microactuator is obtained using a single coil and a magnetic core with a gap. A plunger having two magnetic heads is supported for back and forth linear movement with respect to the gap in the magnetic core, and is spring biased to a neutral position in which the two heads are on each side of the gap in the core. The single electrical coil is coupled to the core and is provided with electrical current to attract one of the heads toward the core by reluctance action to drive the plunger to a limit of travel in one direction. The current is then cut off and the plunger returns by spring action toward the gap, whereafter the current is reapplied to the coil to attract the other head of the plunger by reluctance action to drive the plunger to its other limit of travel. This process can be repeated at a time when switching of the actuator is required.

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