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• 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 incandes-
cent 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 always be started at a lower
speed setting and then increased. The maximum
permissible voltage of 12 V DC (direct current) may
not be exceeded.
• In the case where the motor comes to an unex-
pected standstill (e.g. power cut), immediately dis-
connect all supply lines from the mains power sup-
ply 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 com-
ponents.
• 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 U
:
0
No-load current:
No-load speed
n
at 12 V:
0
Chuck:
Continuous noise level
at 1 m distance:
In DC motors there is practically a linear relationship
between the supply voltage and speed. For that rea-
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com • Technical amendments are possible
12 V DC
approx. 1.2 A, maximum
permissible current: 6 A
(maximum 5 min.) Rotation
direction: clockwise from
the motor's perspective
when connection of "+"
terminal is to red and "–"
is to the blue socket.
see rating
1 - 10 mm
70 dB(A)
son the speed for any given voltage can easily be de-
duced from the data on the rating plate:
n = n
U / U
0
0
3. Operation
• Using the stand rod the motor can be secured in
place either in a bench clamp, a tripod or a cou-
pling 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
(U10361). 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 especially 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 turn-
ing from one setting to the next. Intermediate set-
tings are not allowed.
• The motor is designed for operation in short ex-
periments and not for continuous operation. In
particular when operating at higher currents start-
ing 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 "uncomfort-
ably" hot – i.e. higher than normal body tempera-
ture, than a break should be taken.
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. Fur-
thermore, under no circumstances should the de-
vice be submerged in water.
EC conformity declaration
In accordance with the directives set forth in the EC
guidelines 98/37/EG and 89/336/EWG, the company 3B
Scientific GmbH hereby guarantees that the experimen-
tal motor, cat. no. U10375, complies with essential
safety requirements of the above-mentioned guidelines
and conforms to the following standards: EN 55014-1
and EN 55014-2.
Hamburg, 9 Feb. 2004
Manfred Kurland
3B Scientific GmbH,
Germany
4
.
, 21031 Hamburg,
Rudorffweg 8
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