Lab Experiment No. 5: Single-Phase Motors

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-EE 448 Laboratory Experiment 5Single Phase Induction Motors2. Close the power supply switch, rapidly adjust the voltage to 60 v andmeasure the current through the main winding as quickly as possible.Shut off the supply as soon as the reading can be made.I main winding = ______________ Aac (at 60 volts)Assuming current increases linearly, what would the current in thewindings be with 120 volts across them?____________ Aac (120 volts)3. a. Disconnect the leads from the main winding and connect them to theauxiliary winding and capacitor, as shown in Fig. 3.b. Repeat Procedure 2. Remember to take your measurement as quicklyas possible.I aux winding = ___________ Aac (at 60 volts)Assuming current increases linearly, what would the current in thewindings be with 120 volts across them?___________ Aac (120 volts)Capacitor StartMotor60 VoltVoltageVariableACSource88214N4V1++Voltmeter+ Ammeter -+ -25 AmpI1Main1 2CentrifugalSwitch6 7-Auxilary3 4C5Figure 3: Auxiliary winding starting current connection diagram4. a. Connect both windings in parallel, terminals 1 to 3 and 2 to 5, asshown in Fig. 4. Note that the variable supply, terminals 4 and N arebeing used.- 10 -
-EE 448 Laboratory Experiment 5Single Phase Induction MotorsCapacitor StartMotor60 VoltVoltageVariableACSource88214N4V1+-+Voltmeter+ Ammeter -+ -25 AmpI1Main1 2CentrifugalSwitch6 7Auxilary3 4C5120 VAC Source88211N1Electro-Dynamometer--Figure 4: Capacitor start motor starting connection diagramb. Couple the electrodynamometer to the capacitor start motor with thetiming belt.c. Connect the input terminals of the electrodynamometer to the fixed120 Vac output of the power supply, terminals 1 and N.d. Set the dynamometer control knob at its full cw position to provide amaximum starting load for the capacitor start motor.e. Close the power supply switch. Rapidly, but steadily increase thesupply variac to 60 volts. Measure the starting current and torque asquickly as possible, then immediately shut off the supply.I starting = _______________ Aac (at 60 volts)Assuming current increases linearly, what would the current in thewindings be with 120 volts across them?_______________ Aac (calculated for 120 volts)Starting torque = ___________ lb.in (at 60 volts)5. Using the wattmeter, Electrodynamometer and AC Metering Modules,connect the circuit shown in Fig. 5. (Leave the belt off for the zerotorque setting in part 7.)- 11 -
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Lab Experiment No. 5: Single-Phase Motors

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