19Th Space Electronics

Everette Energy, LLC

Arash Hassanpour Isfahani

Babak Fahimi

Daniel Christopher Dial

Lizon Maharjan

Joseph Hearron

Job Timothy Brunet

Carlos Caicedo-Narvaez

A piezoelectric multiplexer includes an actuator and multiple piezo-morph beams. The actuator includes an actuator conducting head and an actuator stem, and each piezo-morph beam includes a conducting beam contact head and a beam stem manufactured out of piezo-morph material. A control voltage is selectively applied to electrical contacts coupled to the beam stems to create a piezoelectric effect that bends the selected piezo-morph beam and creates an electrical connection between its contact head and the conducting head of the actuator. A control circuit with a controller signals which piezo-morph beam to connect to the actuator. This multi-piezo-morph-beam piezoelectric multiplexer can be affixed to the electrical terminals of different electrical components (e.g., a transistor) to create an electrical cell that can be manufactured on a semiconductor chip or in a microelectromechanical system (MEMS) device.

Piezoelectric multiplexer

A control circuit for an induction motor operates to determine whether the inductor motor is of the three-phase type or single-phase type. If three-phase, a variable frequency drive operation is implemented. If single-phase, a closed loop current control process is implemented. The closed loop current control process includes an operation by the control circuit to measure winding resistances and determine a turns ratio for the main and auxiliary motor windings. The turns ratio is used in the closed loop current control process to scale a measurement of current in the auxiliary winding for the purpose of generating the control voltage for the auxiliary winding. Phase of the current in the windings is further processed to generate a phase control signal.

Driver circuit and method for single-phase and three-phase induction motors

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Dallas, TX, United States of America

Arash Hassanpour Isfahani