Engineering, 22.08.2020 16:01 achy1905

Experiment No.1 THE WOUND ROTOR INDUCTION MOTOR
OBJECTIVE
To examine the construction of the three-phase wound-rotor induction motor.
EQUIPMENT REQUIRED
Power Supply
Wound rotor Induction Machine,
Electrodynamometer,
AC Ammeter and AC Voltmeter
Connection leads
PROCEDURE
CAUTION!
High voltages are present in this Experiment! Do not make
any connections with the power on! The power should be
turned off after completing each individual measurement!
1. Examine the construction of the Three-Phase Wound-Rotor Induction Motor, paying particular attention to the motor, slip rings, connection terminals and the wiring.
2. Viewing the motor from the rear of the module:
A. Identify the three rotor slip rings and brushes.
B. Can the brushes be moved?
C. Note that the three rotor windings are brought out to thekanivia a slot in the rotor shaft.
D. Identify the stator windings. Note that they consist of many turns of small diameter wire evenly spaced around the stator.
E. Identify the rotor windings. Note that they consist of many turns of slightly larger diameter wire evenly spaced around the rotor.
F. Note the spacing of the air gap between the rotor and the stator.
3. Viewing the front face of the module:
EEL 3003 ELECTRICAL MACHINES 2
A. The three separate stator windings are connected to terminalsandandandand.
B. What is the rated current of the stator windings?
C. What is the rated voltage of the stator windings?
D. The three rotor windings are (wye, delta) connected.
E. They are connected to terminals, and.
F. What is the rated voltage of the rotor windings?
G. What is the rated current of the rotor windings?
H. What is the rated speed and mechanical output power of the rotor?
1. Knowing that the voltage induced in the rotor winding is zero when it is turningat12o synchronous speed, what is the synchronous speed of your motor?
2. Knowing that the equation for synchronous speed is:
Ns= 120f/P
where: Ns- synchronous speed (r/min) f
= power line frequency (Hz)
P number of stator poles
determine the number of poles in your motor.

Answers: 3

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Experiment No.1 THE WOUND ROTOR INDUCTION MOTOR
OBJECTIVE
To examine the construction...

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