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Evaluating Fixed Magnet DC Motors BattleBots IQ, The High School Challenge No components are more essential to a BattleBots’ functionality than the motors used to power the drive system. Drive motor failures result in almost certain loss in the BattleBox. Making informed decisions based on a few simple bench top motor experiments will help ensure the success of your BattleBot project. The ability to specify and configure fixed magnet DC motors will prevent critical motor failure and save you hundreds of dollars in replacement costs. PowerPoint Show   Design Torque   Measuring Motor Stall Current   Measuring Motor Stall Torque   Robot Speed   Gears Reduction Activities & Worksheets   Fixed Magnet DC Motor Evaluation Work Sheet Print   Printer-Friendly Version Need a plugin or viewer? Terms Electromagnetism Fixed Magnets Armature Torque RPM RPS Wire Gage AWG Commutator Stator Resistance Voltage Current Amperes PIRE Tractive Force Field Brushes Insulation Power Supply Stall Current Stall Torque No Load RPM Conductor Gear Ratio Drive Platform Test Leads Materials Assorted DC Fixed Magnet Motors #14 – #4 AWG Solderless Solderless Connectors Crimping Tool Wire Strippers HD Wire Cutters Assorted sizes of Heat Shrink Electrical Tape Fixed Magnet DC Motor(s) Photo Tachometer or Shaft Tachometer Calculator 1,5,10,50 lbf. Spring Scales or 5, 25, 50, 250 Newton Scales #10 AWG Multi stranded wire with Nylon Insulation Several large capacity 12 Volt Batteries Several HD Test Lead Pairs HD Normally Closed Spring return to Off Automotive Starter Switch Battery Chargers High Amperage (35 amps or better) Power Supply (optional) Photo Tachometer 0-100 Amp ammeter 12”-24” Bar Clamps 8-10” C-Clamps Graph Paper Pencils VOM ( Volt Ohm meter) -100 - 0 - +100 Ammeter Objectives Measure and record fixed magnet DC motor Stall torque, Stall Current and no load RPM. Create and analyze graphs of the relation ship between torque, current and rpm based on empirical studies of fixed magnet DC motors. Mathematically determine the power output of a fixed magnet DC motor. Mathematically determine the optimum drive gear ratio for a given fixed magnet DC motor. Determine the appropriate size wire gage for the motor/power electric system. Complete the Motor Evaluation Worksheet that accompanies this lesson.