3B SCIENTIFIC PHYSICS U8496300 Instructions D'utilisation page 6

•
Connect the transformer (DC output) to the
connectors.
•
Gently press the carbon brushes on to the
commutator.
4.3 Experiment procedure
•
Switch on the transformer (DC) and set the
initial voltage to 4 V.
•
Start the motor, with a slight push if necessary.
•
Successively increase the DC voltage to 6 V and
9 V.
•
Observe the speed of the rotor/armature wind-
ing in relation to the applied voltage.
•
Switch off the power supply unit and reverse
the polarity of the connecting leads to the mo-
tor.
•
Once again, apply voltages between 3 V and
9 V and observe the reversal in the direction of
rotation.
5. Operation as an DC-electric motor connected
in series
9- 12 V
5.1 Additionally required
Coil, 400+800 windings
U-core, laminated
Transformer with rectifier
Experiment leads
5.2 Set-up
•
Insert the U-core with the coil (400+800 wind-
ings) already slid onto it into the holding fix-
ture so that this does not interfere with the
free movement of the rotor. The U-core along
with the coil functions as a stator.
•
Connect the stator coil (on the U-core) and the
rotor in series with the transformer.
5.3 Experiment procedure
•
Apply a voltage of 9-12 V DC., start the motor,
with a slight push if necessary.
U8498085
U8498110
U8521110
•
Observe the speed of the rotor/armature wind-
ing in relation to the applied voltage.
•
Disconnect the supply voltage and reverse the
polarity of the connecting leads on the coil.
•
Once again, apply a voltage between 9 V and
12 V and observe the reversal in the direction
of rotation.
•
Disconnect the operating voltage once more
and reverse the polarity of the connecting
leads supplying the operating voltage.
•
Apply 9-12 V voltage and observe the direction
of rotation.
6. Operation as an DC-electric motor connected
9- 12 V
6.1 Additionally required
Coil, 400+800 windings
U-core, laminated
Transformer with rectifier
Experiment leads
6.2 Set-up
•
Insert the U-core with the coil (400+800 wind-
ings) already slid onto it into the holding fix-
ture so that this does not interfere with the
free movement of the rotor. The U-core along
with the coil functions as a stator.
•
Connect the stator coil (on the U-core) and the
rotor in parallel with the transformer.
6.3 Experiment procedure
•
Apply a voltage of 9-12 V DC., start the motor,
with a slight push if necessary.
•
Start the motor, with a slight push if necessary.
•
Observe the speed of the rotor/armature wind-
ing in relation to the applied voltage.
•
Disconnect the supply voltage and reverse the
polarity of the connecting leads on the coil.
•
Once again, apply a voltage between 9 V and
12 V and observe the reversal in the direction
of rotation.
2
in parallel
U8498085
U8498110
U8521110