Me2143-1 Motor Characteristics

ME2143 Sensors and Actuators

AY2010/2011 Semester 2

ME2143-1 – Motor Characteristics (D5) Informal Report Matriculation Number : Name Group Subgroup : 2I1 Date

U096095W U096112N : Tham Kai Sheng Tan Wil Sen : Wednesday Group : 06 April 2011

Objectives 



To be familiar with the wiring and basic characteristics of the following motors: i. D.C. Series Motor ii. D.C. Shunt Motor iii. A.C. 3-Phase Squirrel Cage Induction Motor. To examine the relationship between Torque, Speed, Voltage, and Current for various types of motor connections in no-load and loaded configurations.

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Results DC Series Motor Constant-Load Test Table 1: DC Series Motor Constant-Load Test Results Volts (V) Speed (rpm) Current (A) 180 2178 0.478 160 1989 0.460 140 1784 0.450 120 1545 0.445 100 1286 0.440 80 1032 0.428 60 764 0.415

Load Test Table 2: DC Series Motor Load Test Results Voltage Speed Current Torque (Nm) (V) (R.P.M.) (Amp) 180 2153 0.10 0.4/85 180 1870 0.20 0.573 180 1684 0.30 0.640 180 1549 0.40 0.702 180 1435 0.50 0.769 180 1315 0.60 0.862 180 1259 0.70 0.902 180 1161 0.80 0.997 180 1115 0.90 1.044 180 1074 1.00 1.082

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DC Shunt Motor No-Load Test Table 3: DC Shunt Motor No Load Test Results Speed Field Current, IF Line Current, IL Volts (V) (rpm) (A) (A) 240 1499 0.192 0.350 220 1444 0.156 0.317 200 1380 0.140 0.309 180 1325 0.127 0.306 160 1261 0.113 0.295 140 1197 0.099 0.294 120 1123 0.085 0.298 100 1041 0.071 0.305 80 952 0.057 0.330 60 793 0.042 0.360

Load Test

Volts (V) 240 240 240 240 240 240 240 240 240 240 240

Table 4: DC Shunt Motor Load Test Results Speed Torque Field Current, If Line Current, It (rpm) (Nm) (A) (A) 1558 0.02 0.169 0.334 1533 0.10 0.168 0.382 1489 0.20 0.167 0.469 1455 0.30 0.166 0.534 1420 0.40 0.165 0.617 1394 0.50 0.164 0.682 1367 0.60 0.163 0.758 1344 0.70 0.163 0.829 1321 0.80 0.162 0.902 1299 0.90 0.161 0.990 1284 1.00 0.160 1.046

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AC Three-Phase Induction Motor Table 5: AC 3-P Motor 400VAC Results Line Current Volts (V) Torque (Nm) Speed (rpm) (A) 400 0.03 1475 0.28 400 0.10 1468 0.29 400 0.20 1459 0.30 400 0.30 1451 0.31 400 0.40 1440 0.33 400 0.50 1432 0.34 400 0.60 1418 0.36 400 0.70 1408 0.38 400 0.80 1397 0.41 400 0.90 1385 0.43 400 1.00 1371 0.46

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Discussion 4.3 a) Why must the DC series motor be always started under load and give examples in your answer? b) What is the relationship between Torque and Current for a DC series motor? Tdev  KI A   KF IF From equation (5), . But the magnetic flux, . Tdev  KK F I A

For DC series motor, IA = IF, hence proportional to IA2.

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. This means that Tdev is directly

c) Try your best to briefly explain the shape of the Torque versus Speed graph obtained in this experiment.

5.3 a) Explain how speed is regulated in a DC shunt motor and give examples. b) From no-load to full-load explain in your own words why there is little speed variation over this range. c) Try your best to briefly explain the shape of the Torque versus Speed graph obtained in this experiment.

Conclusion 



In this experiment, we have gained familiarity with the wiring and basic characteristics of the D.C. Series Motor, D.C. Shunt Motor and A.C. 3-Phase Squirrel Cage Induction Motor. Relationship between Torque, Speed, Voltage, and Current for these types of motor connections in no-load and loaded configurations is examined by plotting the graphs from the result of loading tests carried out.

Me2143-1 Motor Characteristics

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