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Three-Phase Wound-Rotor
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Sample Exercise
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Exercise
2
Three-Phase Wound-Rotor Induction Machine with Rotor
Resistance
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Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Discussion
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Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Discussion
Three-phase wound-rotor induction machine starting torque
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Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Discussion
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Varying the speed of a three-phase wound-rotor induction machine through
the rotor resistance
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Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Discussion
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Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Discussion
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© Festo Didactic 86367-10
Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Procedure Outline
PROCEDURE OUTLINE
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Set up and connections
In this section, you will set up a circuit containing a three-phase wound-rotor
induction machine coupled to a prime mover/brake. You will then set the
measuring equipment required to study the three-phase wound-rotor induction
machine operation when the rotor windings are interconnected through resistors.
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E shows
a Appendix
supplied machine.
how to replace the pulley installed on the shaft of a
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sure you use the same Four-Quadrant Dynamometer/Power Supply
a Make
module as in Exercise 1 of this manual by confirming that the module’s serial
number is the same as the serial number you recorded in the first step of
Exercise 1.
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Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Procedure
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values of certain components used in the circuits of this manual depend
a The
on your local ac power network voltage and frequency. Whenever necessary,
a table below the circuit diagram indicates the value of each component for
ac power network voltages of 120 V, 220 V, and 240 V, and for ac power
network frequencies of 50 Hz and 60 Hz. Make sure to use the component
values corresponding to your local ac power network voltage and frequency.
C lists the switch settings required on the Resistive Load in order to
a Appendix
obtain various resistance values.
28
© Festo Didactic 86367-10
Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Procedure
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a local ac power network frequency of 60 Hz.
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Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Procedure
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Effect of the rotor resistance on the operation of a three-phase wound-rotor
induction machine
In this section, you will make the three-phase wound-rotor induction machine
speed decrease by step from 100 r/min above the machine synchronous speed
to 0 r/min, recording at each step in the Data Table the machine speed, torque,
mechanical power, line current, active power, reactive power, and power factor.
You will calculate the machine efficiency using the recorded machine mechanical
power and active power values. On the same graph, you will plot the torque
versus speed curve when the rotor is short-circuited (using the results you
obtained in the previous exercise), as well as when resistance is added to the
rotor, and interpret the results. Finally, you will plot on the same graph the
efficiency versus mechanical power curve when the rotor is short-circuited (using
the results you obtained in the previous exercise), as well as when resistance is
added to the rotor, and interpret the results.
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Three-Phase Wound-Rotor Induction Machine is fitted with an overvoltage
a The
protection circuit preventing the rotor voltage from reaching values that could
damage the machine rotor windings. If the overvoltage protection trips when
performing the manipulation above, turn the three-phase ac power source off,
wait a few seconds, and turn the three-phase ac power on while pressing and
holding the 3URWHFWLRQ2YHUULGH push-button on the Three-Phase Wound-Rotor
Induction Machine.
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© Festo Didactic 86367-10
Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Procedure
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the overvoltage protection trips at the end of the speed sweep performed
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approaches 0 r/min), stop the 6SHHG 6ZHHS function, turn the three-phase
ac source power source off, delete the data recorded to the Data Table during
this speed sweep, turn the three-phase ac power source on, and start the
6SHHG 6ZHHS function again. This time, however, press and hold the
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Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Procedure
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machine torque recorded when the machine speed is equal to 0 r/min is
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Exercise 2 – Three-Phase Wound-Rotor Induction Machine with Rotor Resistance  Procedure
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