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8. Caution and
Matters
8-1 Warnings: In a
motor near the end its life, or under breakdown conditions, short
circuits can develop between commutator segments. Uncontrolled voltage
may then leak into the power source circuit. Motors may overheat or fail
if run continuously with its rotor locked condition or under excessive
loads.
8-2 Destructive
atmospheres: Do not use and store the motor in the corrosive gas
atmosphere (H²S, SO², NO², Cl², etc.), or substances that can emit toxic
gases, such as organic silicon, cyanide, formalin, or phenol compounds.
The motor may get serious damages.
8-3 Condensation:
Condensation on the electrical circuits can destroy the motor or control
circuits. Monitor the environment and undertake measures to prevent
condensation, such as installing condensation sensors to cut power when
necessary.
8-4 Be aware of the
following factors and perform necessary tests to check a motor’s ability
to adopt with your mechanism and applications: Motor life, electric
noise, mechanical noise, vibration, static-electrical noise resistance,
power-source noise resistance, drift of rpm, electrical resonance
between control circuit and motor, mechanical resonance between
subassembly and motor malfunction due to motor noise, electrical
magnetic interference, malfunction due to magnetic flux leakage,
destruction due to lightning-related power surge, grounding.
8-5 Some particular
plastic materials can crack and fail after exposure to motor bearing
oil. Perform test the motor in/on the subassembly to check the influence
of the oiled plastic parts.
8-6 Avoid
connecting a serial resistor to the motor if at all possible, as this
can negatively affect reliability. If this is unavoidable, keep
resistance as low as possible and test thoroughly for reliability before
using.
8-7 When testing
for UL, CSA or other safely standards, apply for approval for the entire
subassembly.
8-8 Do not store
motors under conditions of extreme temperatures or high humidity, or for
longer than six months even room conditions. When removing out of
packaging after storage, take precautions to prevent condensation.
8-9 Connections: Complete soldering operations within three
seconds to prevent damage to leads and terminals. Make sure that the
soldering tip does not exceed 350°C. Be gentle with terminals; dents or
pressure on them can lock up the motor.
8-10 Please
consults us in advance when design considerations call for forcefully
stalling the motor using a short circuit at the terminal or reverse
voltage. Such operations can shorten product life.
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