Download Lab Information -- Direct Current Machine Experiments

Lab Information -- Direct Current Machine Experiments
EXPERIMENT NO. 10
COMPOUND GENERATOR CONNECTIONS
PURPOSE:
To study the various types of compound generator connections.
APPARATUS REQUIRED:
1. One DM-100 DC machine as generator.
2. One MFM-100 Multifunction machine.
3. One Hampden 0 to 150 volt DC voltmeter.
4. One Hampden 120 volt AC power source.
PROCEDURE:
1. Couple the CD generator to the multifunction machine and make the connections shown in
Figure 10. These DC generator connections are for a short-shunt, cumulative-compound
generator.
2. Start the motor and adjust the generator's output to maximum obtainable voltage by means of
its field rheostat. Record the polarity of this voltage.
3. Stop the motor and connect the generator for a long shunt, differential compound generator.
Start the motor, adjust the generator's output to the maximum obtainable voltage and record the
connections and output voltage polarity.
4. Stop the motor and connect the generator for a long shunt, cumulative compound generator.
Start the motor, adjust the generator's output to the maximum obtainable voltage, and record the
connections and output voltage polarity.
5. Stop the motor and connect the generator for a short shunt, differential compound generator.
Start the motor, adjust the generator's output to the maximum obtainable voltage, and record the
connections and output voltage polarity.
REPORT:
For each of the four connections used in the procedure, draw the connections and indicate the
output polarity. Using the diagrams in the following page, predict the output polarity that would
be expected whether buildup will occur, and identify the type of connection.
FIGURE #10