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Answer Posted / bose
Condenser is the old term for capacitor. In a motor circuit,
there are two uses for capacitors, the first is to provide
extra current to get the fan motor to overcome it's own
resistance to movement, the way this works is that the
capacitor charges until it can supply the requisite current,
then discharges, not unlike giving an airplane motor a
'kick' before it can start proper. The other use is snubbing
inductive kickback. When a inductive load, such as the coil
windings on a motor, are switched off, the properties of an
inductor can cause a massive power surge which can damage
control circuits. to mediate this problem, small capacitors
are put in parallel over the load, so that the sharp
'inductive kick' has a discharge route through the capacitor
(since the 'kick' is a sharp voltage spike, it looks like a
high frequency signal). If the capacitor is large, it's
probably used for the former, if small, the latter.
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