Non-Inductive Actuation Mechanisms to Reduce Interference with Magnetometer-Based Navigation Navy SBIR FY2010.1 Sol No.: Navy SBIR FY2010.1 Topic No.: N101-096 Topic Title: Non-Inductive Actuation Mechanisms to Reduce Interference with Magnetometer-Based Navigation Proposal No.: N101-096-0610 Firm: New Scale Technologies, Inc. 121 Victor Heights Parkway Victor, New York 14564 Contact: Daniele Piazza Phone: (585) 924-4450 Web Site: www.NewScaleTech.com Abstract: A non-inductive rotary actuator system is proposed to move canards in miniature guided munitions without magnetic interference. This new actuator is a piezoelectric ceramic motor that uses ultrasonic vibrations to directly rotate a shaft with high torque and speed and without gears or other mechanical linkages. Multiple vibrating piezoelectric beams generate tangential forces on the rotating shaft. The forces from the individual piezo elements are optimized in frequency, amplitude and preload and driven by advanced electronic circuits which maximize power density and efficiency. The tangential forces from individual piezo elements are designed to add together and produce 0.2 N-m of torque, 0.13 m/sec speed, using approximately 30 W and fitting in a volume of one inch cubed The system is designed to be simple, low mass and strong enough withstand high launch accelerations. The piezoelectric devices operate directly from less than 24 volts which eliminates the need for a voltage boost and associated inductors. Two-phase ultrasonic drive signals are generated using high-efficiency full-bridge switching integrated circuits. The drive and control electronics, including the driver IC's, position sensor, and microprocessor fit inside the actuator volume. Benefits: This new non-inductive rotary actuator system enables greater miniaturization of precision guided munitions that require fuzing and flight surface control. The actuators can be located in close proximity with navigation systems that measure orientation and roll rate using the earth's magnetic field without generating magnetic interference. Other commercial applications include: (1) motors in mobile phones that do not interfere with magnetic compasses, (2) medical devices that are MRI safe and image compatible, and (3) scientific instruments that need to function in large magnetic fields without degrading measurement accuracy. Return