Conference Session

Laboratory Development in ECE Education

Collection

2008 Annual Conference & Exposition

Authors

Osama Mohammed, Florida International University; Nagy Abed, Quanta Technology

Tagged Divisions

Electrical and Computer

transformed in a coordinate system that rotates with therotor flux vector. The main function of the controller is to control the switching of thepower converter so that desired currents are supplied to the motor.The actual motor currents are measured by the Hall-effect sensors, which have goodfrequency response and fed to the FPGA board. As the motor neutral is isolated, only twophase currents are fed back to the board and the other phase current is calculated from them.The calibration of the current sensor is such that for 1 A current flowing through the currentsensor, output is 0.5 volts. Q axis reference current is calculated from the speed error signalby the PI controller.Three phase reference currents are generated utilizing reference q axis

Conference Session

Laboratory Development in ECE Education

Collection

2008 Annual Conference & Exposition

Authors

Bruce Dunne, Grand Valley State University; Melvin Cooke, GE Aviation

Tagged Divisions

Electrical and Computer

generates its own carrier signal. Thecircuit operates due to the action of the message signal driving the bias point of the Page 13.367.7oscillating transistor. As the amplitude of the message signal varies, the oscillationfrequency varies proportionally, thus creating an FM signal. To operate, this circuitrequires an appropriately High-Q inductor-capacitor pair (L1 and C2). Additionally, thevariable capacitor C2 controls the oscillator frequency, which roughly supports a centerfrequency range of 80–120 MHz.This circuit uses a fairly low-level message signal amplitude of less than 100 Vrms . If sodesired, the output level of the FM signal can be varied by