| R/C INFORMATION 3 |
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Electric power is a popular method of powering models and offers clean,
quiet and easy operation. Electric motors are available in many different
forms and sizes, from the low cost standard '540' to high performance cobalt
magnet equipped aircraft motors. Many performance motors offer adjustable
timing for optimum running efficiency and speed and many are supplied complete
with a ballraced shaft for minimum power loss and longer service life.
HOW AN ELECTRIC MOTOR WORKS
A motor converts electrical energy into power to drive models. Two
semi-circular permanent magnets mounted on the inside of the motor case
create a strong magnetic field through the interior space. Inside that
space is a shaft-mounted iron armature with three lobes (on Kyosho motors)
that are wound with copper wire. Current flows via a commutator through
the windings of two loads at a time and magnetizes them so they are attracted
to or repelled from the permanent magnets field.
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1. Brush spring 2. Condensor 3. Commutator 4. Wire 5. Brush 6. End-bell 7. Wire 8. Armature 9. Armature 10 .Outer case 11. Shaft 12. Magnet holder 13. Ball or plain bearing |
NICKEL
CADMIUM BATTERIES
Nickel-cadmium (NiCd) batteries can deliver high current
and can be quickly recharged 300 or more times if treated well (cooling
before recharging and no over-charging at high current). They are excellent
for electric models. Cell voltage is about 1.2V, so pack voltages are typically
7.2V, 8.4V, and 9.6V. Cell capacity in mAh (milliampere-hours) indicates
the length of time it can power a model. The higher the number, the longer
the duration.
BATTERY
CHARGERS
Kyosho NiCd batteries can be quickly charged in about 15-30
minutes using a charger of the correct type with a timer or sensor to stop
charging at the correct time. Fast charging past the fully charged point
will overheat the NiCd battery and may ruin it.
For a charger with a mechanical timer, the full timed charge is only for
a fully discharged battery. If the battery is only partly discharged, reduce
the charge time in proportion (or discharge the NiCd fully first). Kyosho
chargers operate from a 12V car battery. Some types of charger are intended
for only one type of battery, while with others the output current can
be adjusted so that they are suitable for many different types.
