Commutator Machines - Commutator Machines Washington...

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Commutator Machines Washington University Electrical Engineering JEE 4350(Tuesday Session) Electrical Energy Laboratory by T. “Ryan” Mason With Artem Boyko Joe Doyle 1
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Report a.) The DC resistance had to be measured with the four points method because the resistance is relatively low. b.) The direction of the rotation wasn’t phase dependent; however, rotation was controlled with FWD/REV switch. The data was taken with the direction of rotation in a clockwise manner. c.) Theoretical Peak Current Value: = + ( )= ( ) ( )= . ( ) I VRSE RA From four points method 115 V 4 Ω 28 75 A The experimental peak current value is shown with the scope hardcopy on the next page. A possible reason for the modest discrepancy between the theoretical and the experimental peak values is that the scope capture need for the experimental value has some noise, thus making it hard to ascertain the peak value from the plot. 2
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d.) P in (W) I (A) V T (V) V T *I 155 1.34 113 151.42 225 2 112 224 290 2.6 111 288.6 335 3 110.7 332.1 400 3.6 109.8 395.28 450 4.13 109.14 450.74 8 510 4.66 107.8 502.34 8 535 4.98 107.5 535.35 Comment: The multiple of the motor voltage times the motor current increased in linear fashion as the power into the motor increased. 3
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I (A) V T (V) P in (W) T (once- in) T (lb- ft) n (RPM) V T *I P out (hp) P out (W) η 1.34 113 155 0 0.000 8520 151.42 0.000 0.000 0.000 2 112 225 20 0.104 6780 224 0.134 100.31 7 0.446 2.6 111 290 40 0.208 5880 288.6 0.233 174.00 0 0.600 3 110.7 335 50 0.260 5430 332.1 0.269 200.85 5 0.600 3.6 109.8 400 75 0.391 4950 395.28 0.368 274.65 0 0.687
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Commutator Machines - Commutator Machines Washington...

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