Lab Experiment No. 5: Single-Phase Motors

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-EE 448 Laboratory Experiment 5Single Phase Induction Motors120 VoltVoltageVariableACSource88214N4+Ammeter8 Amp+ -I1---W1Wattmeter--V1++Voltmeter-Capacitor RunMotorMain1 25Auxilary3 46C120 VAC Source88211N1Electro-Dynamometer--Figure: 1 Capacitor run motor connection diagramTable 1. Capacitor run motor measurementsV(volts)Torque(lbf-in)120 0120 3120 6120 9I(amps)S(va)P(watts)Speed(r/min)Output(hp)eff(%)p.f.(% *)4. a. Calculate and record in Table 1 the apparent power delivered to themotor, the developed horsepower, the efficiency, and the powerfactor for each of the listed torques.b. Place ammeters properly in the circuit and measure at ratedtorquecurrent in the main field winding __________current in the auxiliary field winding __________c. At the rated torque measure, calculate and record in Table 2 thevalues requested for each of the voltages listed.- 8 -
-EE 448 Laboratory Experiment 5Single Phase Induction MotorsTable 2V(volts)125120115I(amps)S(va)P(watts)Speed(r/min)Output(hp)eff(%)p.f.(%)5. You will now determine the maximum starting torque developed bymotor and its starting current.a. Disconnect the wattmeter from your circuit and change the rangeof the ammeter from 8 to 25A.b. Set the dynamometer control knob to its full cw position (formaximum loading).c. Close the power supply switch. Rapidly, but steadily increase thesupply variac to 120 volts and measure the developed torque onthe dynamometer scale and the starting current. Open the powersupply switch as soon as possible.Starting Torque = ____________ lb.inStarting Current = ____________ AacB. CAPACITOR START MOTOR1. Using your EMS Split-Phase/Capacitor Start Motor, Power Supply andAC Metering Modules, connect the circuit shown in Fig. 2. Note thatthe variable 120 Vac output of the power supply, terminals 4 and N arebeing used.Capacitor StartMotor60 VoltVoltageVariableACSource88214N4V1++Voltmeter+ Ammeter25 Amp+ -I1-MainCentrifugalSwitch-1 26 7Auxilary3 4C5Figure 2: Main winding starting current connection diagram- 9 -
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Lab Experiment No. 5: Single-Phase Motors

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