Hamilton Sundstrand Corporation

Hamilton Sundstrand Space Systems International, Inc.

Harold J Hansen

Robert P Wichowski

Kevin G Hawes

Waleed M Said

Patrick J Sears

Charles V DeSantis

Hamdi Kozlu

A current limiting circuit for a motor controller includes a comparator. The comparator has a sensed current input, a current threshold input, and an overcurrent protection trip output. A variable resistance current threshold circuit is connected to the current threshold input. A first controller is connected to the variable resistance current threshold circuit via a plurality of connections. The first controller is configured to control a voltage output of the variable resistance current threshold circuit.

Variable threshold current limiting circuit

A method includes characterizing the effects of an electric field on a first set of printed wiring boards (PWBs) by testing the first set of PWBs to generate test data, using the test data to determine a dielectric life curve of the first set of PWBs, and based on the dielectric life curve, defining a screening time and a screening voltage to screen for premature failures in a second set of PWBs due to electric fields.

Detecting early failures in printed wiring boards

A terminal strip and a method of improving a creepage dielectric strength of the same includes a base plate, a barrier, each constructed from an insulating material, and a plurality of terminals constructed from a conducting material. The terminals are connected to the base plate and spaced along a surface thereof. The barrier is disposed between adjacent terminals and configured such that the creepage dielectric strength of the insulating material between adjacent terminals is equal to or greater than a bulk dielectric strength of the insulating material between adjacent terminals.

Creepage design terminal strip

A sensorless motor controller includes a variable link control, including a radiation-hardened field programmable gate array (FPGA) and a back electromotive force (EMF) decoder circuit. The back EMF decoder infers the position of a rotor of the motor. A filter on the decoder conditions the back EMF signal and has multiple cutoff frequencies which can be dynamically controlled by the FPGA in order to compensate for phase shift in the back EMF signal. The FPGA also controls a variable DC link and its digital speed control loop.

Variable link sensorless brushless direct current motor controller for space and hardened applications

A compact field programmable gate array (FPGA)-based digital motor controller (), a method, and a design structure are provided. The compact FPGA-based digital motor controller () includes a sensor interface () configured to receive sensor data from one or more sensors () and generate conditioned sensor data. The one or more sensors () provide position information for a DC brushless motor (). The compact FPGA-based digital motor controller () also includes a commutation control () configured to create switching commands to control commutation for the DC brushless motor (). The commutation control () generates commutation pulses from the conditioned sensor data of the sensor interface (). The compact FPGA-based digital motor controller () also includes a time inverter () configured to receive the commutation pulses. The time inverter () converts the commutation pulses into a rotational speed of the DC brushless motor () to provide a linear feedback control parameter.

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Hamden, CT, United States of America

Harold J Hansen