BATTERY PERFORMANCE METER FOR ELECTRIC PROPULSION SYSTEMS Team Members: Ryan Bickham, Dennis Blosser Cody Dinkins, Todd Dutton, Rachel Shively Project Sponsor: Patrick Taylor, Ph.D., AMRDEC February 26, 2008

Received: Tektronix CPS250 Power Supply Voltage outputs: One 5.0 VDC - Two 0 to 20 VDC Line regulation: - 0.01% +/- 3 mV

Motor-Dynamometer Tolerance Analysis Dynamometer accuracy is between +/-0.3% and +/-0.5% Dyno max power output is 3000 W Dyno accuracy within 15 W Estimated motor power is 122.1 W or 0.164 hp For a 12 min run time If power accuracy is within 15 W then the motor power accuracy will be +/-12.3%

Motor Mount Sample Drawing

NI Virtual Instrumentation Block Diagram

NI Virtual Instrumentation GUI

Sample Filtering - Each signal coming into the SCXI-1102B must be filtered by a simple RC lowpass filter. - From provided documentation: - Choose fs = 512 samples/sec - fc = 165 Hz Simple Resistor/Capacitor calculation: RC = .00096 → Choose R = 1 kΩ C = 1 µF

Procurement List - SCXI-1000 Filler Panels - SCXI-1360 Front Filler Panel, Quantity: 2 - SCXI-1361 Rear Filler Panel, Quantity: 1 - Available in orders of 5-10, $15/order - EC3 Battery Connector Extension, Quantity: 4 – 5, Price: $6 each

12 VDC