2
Directly attaching light (approx. 0.5 kg maxi-
mum) centrifugal devices into the chuck is al-
lowed, e.g. flattening ring or flywheel regulator if
these components are not out-of-balance. Oth-
erwise the driving must be achieved using the
belt pulley provided. At any rate the corre-
sponding operating instructions included must
be complied with.
The motor can also be operated as a generator.
To do this, the device is mounted onto a bench
using a bench clamp, for example, and the
crank handle is inserted into the chuck. In this
operating mode it is prohibited to have a power
supply connected to the terminal sockets (7).
Instead, an incandescent lamp or a measuring
instrument should be connected.
The mains power supply (or similar) used to
power the motor must be set up outside the
danger zone (for example behind a protective
wall). The use of a variable power supply is
recommended so that the experiments can al-
ways be started at a lower speed setting and
then increased. The maximum permissible volt-
age (refer to rating plate) may not be exceeded.
In the case where the motor comes to an unex-
pected standstill (e.g. power cut), immediately
disconnect all supply lines from the mains pow-
er supply unit (or the power source being used),
in order to avoid any unintended restart.
The motor is equipped with a torque limiting
mechanism (4). Experiments should always be
started at the lowest possible setting (setting "1"
on the scale, which is designated with an arrow
and the letter "M"). If the torque is not sufficient
the power supply must be switched off and the
next highest setting selected.
Before starting the experiment please check
once again for possible assembly or connection
errors (loose screws or chuck, etc.) or visibly
defective components.
During operation the experiment setup is to be
constantly observed and immediately switched
off should the slightest irregularity arise (change
in noise volume, increasing vibration).
2. Technical data
Nominal voltage U0: 1.5 - 18 V DC (see rating
plate)
No-load current: approx. 1 - 2 A, maximum
permissible current: 5 A
(maximum 5 min.)
Rotation direction: clockwise from the motor‘s
perspective when connec-
tion of "+" terminal is to red
and "–" is to the blue sock-
et
No-load speed n0 at U0: see rating plate
Chuck: 1 - 10 mm
Continuous noise level
at 1 m distance: 70 dB(A).
In DC motors there is practically a linear relation-
ship between the supply voltage and speed. For
that reason the speed for any given voltage can
easily be deduced from the data on the rating plate:
n = n0 U / U0.
3. Operation
With the experiment motor you can perform exper-
iments on centrifugal force (additional equipment
required) and power generation (generator mode).
Using the stand rod the motor can be secured
in place either in a bench clamp, a tripod or a
coupling sleeve. Alternatively, it is also possible
to mount the motor on plates using a drill hole
(D = 8 mm) as, for example, with the mount
(1002655). Furthermore it can be secured on a
lab bench using a bench clamp. In this case the
upper side should rest on the table top.
To lock the shaft into the chuck the locking ring
(3) is held securely while the ring on the chuck
(2) is turned. It is particularly importantly espe-
cially with small diameters to make sure that the
shaft is seated firmly in all three jaws of the
chuck and is not bent or angled.
The torque setting is set with the ring (4), by
turning from one setting to the next. Intermedi-
ate settings are not allowed.
The motor is designed for operation in short
experiments and not for continuous operation.
In particular when operating at higher currents
starting around 2 A it is important to check the
housing temperature at intervals of every 5 - 10
min. If the temperature of the housing becomes
"uncomfortably" hot – i.e. higher than normal
body temperature, than a break should be tak-
en.
4. Maintenance
The experiment motor is basically maintenance-
free. For cleaning purposes it can be wiped off
with a damp cloth. Solvents should not be used.
Furthermore, under no circumstances should
the device be submerged in water.
