16 figure 11 motor torque vs motor current

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Unformatted text preview: 16 Figure 11: Motor Torque vs. Motor Current for a DC Motor at Various V repeated. Then, the motor inertia, viscous damping and the mechanical time constants are evaluated. 13 5. Results and Calculations Motor Torque vs. RPM Torque (Nm) 2.5 2 1.5 22.7 V 1 18.3 V 0.5 11.7 V 6.1 V 0 0 100 200 300 400 500 600 700 RPM Figure 6: Motor Torque vs. RPM for a DC Motor at Various Voltages Input Power vs. RPM Power (W) 150 100 22.7 V 18.3 V 50 11.7 V 6.1 V 0 0 100 200 300 400 500 600 700 RPM Figure 7: Input Power vs. RPM for a DC Motor at Various Voltages 14 Output Power vs. RPM 50 Power (W) 40 30 22.7 V 20 18.3 V 10 11.7 V 0 6.1 V 0 100 200 300 400 500 600 700 RPM Figure 8: Output Power vs. RPM for a DC Motor at Various Voltages Current (A) Motor Current vs. RPM 7 6 5 4 3 2 1 0 22.7 V 18.3 V 11.7 V 6.1 V 0 100 200 300 400 500 600 700 RPM Figure 9: Motor Current vs. RPM for a DC Motor at Various Voltages 15 Motor Efficiency vs. RPM Efficiency (%) 100 80 60 22.7 V 40 18.3 V 20 11.7 V 0 6.1 V 0 100 200 300 400 500 600 700 RPM Figure 10: Motor Efficiency vs. RPM for a DC Motor at Various Voltages Motor Torque vs. Motor Current Torque (Nm) 2.5 2 1.5 22.7 V 1 18.3 V 0.5 11.7 V 6.1 V 0 0 1 2 3 4 5 6 7 Current (A) Figure 11: Motor Torque vs. Motor Current for a DC Motor at Various Voltages 16 Vss (V) 11.86 0.35 34.29 0.007 0.2331 0.1052 11.50 2.96 4.05 0.007 0.0276 0.1052 No load 11.85 0.43 27.91 0.009 0.2512 0.2648 Stall With disk No load Stall No disk Iss (A) R (Ω) Electrical time constant L (H) Time constant 11.50 2.91 4.12 0.009 0.0371 0.2648 Table 1: Summary of Dynamic Measurements for a Step Voltage of 12V 6. Discussion The six plots of different motor measurements for the various voltage settings follow the expected trends. From these, it is evident that motor torque, motor current, and input power are linearly related to rpm. Motor torque, motor current, and input power increase as rpm decreases. This verifies the proportionality between motor torque and current, and their behavior with respect to r...
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This document was uploaded on 10/10/2013.

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