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Al-Balqa' Applied University Faculty of Engineering Technology Mechatronics Engineering Department Electric Drive Laboratory Experiment Two Investigation of three phase wound rotor induction motor natural and regulated characteristics Student’s Name: Supervisor: Date: Three- Phase Wound Rotor Induction Motor Workbench Part I Experiment Objectives: 1- Studying and identifying the workbench components. 2- Measuring stator windings and rotor windings resistances. 3- Investigation of motor electro-mechanical and torque-speed natural characteristics for star and delta connections of stator windings. Experiment procedures carrying out: 1-Studying and identifying the workbench components A- Plot the experiment block-diagram or schematic diagram showing the main components Exp.2 1/9 B- Write down the specifications and parameters of each component Exp.2 2/9 2-Measuring stator windings and rotor windings resistances A- Using Ohmmeter Rs Rr B- Using Volt- Ampere Method 1- Measuring stator winding resistance using regulated dc source. Plot electrical circuit Apply suitable values of dc source voltages depending on the measured stator resistance value and fill the following table. V, Volt I, Ampere R s ,Ohm Average stator resistance = 2- Measuring rotor winding resistance using regulated dc source. Plot electrical circuit Apply suitable values of dc source voltages depending on the measured stator resistance value and fill the following table. V, Volt I, Ampere R r ,Ohm Average rotor resistance = Exp.2 3/9 3- Investigation of motor electro-mechanical and torque-speed natural characteristics for star and delta connections of stator windings A- Plot the experiment electrical power circuit showing measuring devices for stator windings star connection. B- Experiment steps: 1-Connect the motor electrical power circuit 2- Set the stator windings voltage to nominal value, V1LN 400V 3- Set the rotor windings added resistance to zero, R 2ad 0 4- For different values of load torque fill the following table: Star connection of stator windings V1LN 400V , R 2ad 0 TL , N.m n, rpm I1 , A I 2/ , A C- Plot the experiment electrical power circuit showing measuring devices for delta windings star connection. D- Experiment steps: 1-Connect the motor electrical power circuit 2- Set the stator windings voltage to nominal value, V1LN 230V 3- Set the rotor windings added resistance to zero, R 2ad 0 4- For different values of load torque fill the following table: Exp.2 4/9 Delta connection of stator windings V1LN 230V , R 2ad 0 TL , N.m n, rpm I1 , A I 2/ , A E- Plot star and delta natural electro-mechanical characteristics n natural torque- speed (mechanical) characteristics. F-Results and Conclusions Exp.2 5/9 = f (I 2/ ) and plot star and delta Part II Experiment Objectives: Investigation of motor electro-mechanical and torque-speed regulated characteristics for star connection of stator windings by: 1- Adding Resistances in rotor circuit. 2- Varying stator voltage using autotransformer. Experiment procedures carrying out: 1- Investigation of motor electro-mechanical and torque-speed regulated characteristics by adding resistances in rotor circuit. A- Plot the experiment electrical power circuit showing measuring devices B- Experiment steps: 1-Connect the motor electrical power circuit 2- Set the stator windings voltage to nominal value, V1LN 400 V 3- For each value of rotor added resistance under different load torque values fill the following tables: Star connection of stator windings V1LN 400V , R 2ad 0 TL , N.m n, rpm I1 , A I 2/ , A Star connection of stator windings V1LN 400V , TL , N.m n, rpm I1 , A I 2/ , A Exp.2 6/9 R 2ad Star connection of stator windings V1LN 400V , R 2ad TL , N.m n, rpm I1 , A I 2/ , A C- Plot regulated electro-mechanical characteristics related to natural characteristic and plot regulated torque- speed (mechanical) characteristics related to natural characteristic. D- Results and Conclusions Exp.2 7/9 2- Investigation of motor electro-mechanical and torque-speed regulated characteristics varying stator voltage using autotransformer. A- Plot the experiment electrical power circuit showing measuring devices B- Experiment steps: 1-Connect the motor electrical power circuit 2- Set the stator windings voltage to nominal value, V1LN 400 V 3- For each value of stator windings phase voltage under different load torque values fill the following tables: Star connection of stator windings V1N 230 V , R 2ad 0 TL , N.m n, rpm I1 , A I 2/ , A Star connection of stator windings V1N 180 V , R 2ad TL , N.m n, rpm I1 , A I 2/ , A Star connection of stator windings V1N 120 V , TL , N.m n, rpm I1 , A I 2/ , A Exp.2 8/9 R 2ad C- Plot regulated electro-mechanical characteristics related to natural characteristic and plot regulated torque- speed (mechanical) characteristics related to natural characteristic. D- Results and Conclusions Exp.2 9/9