Commercial door hardware operates on industry standard DC voltage, either 12 or 24 volt.
But current from a building's wall socket is 120 volt AC. A transformer
is needed ''step down'' the voltage to 12 or 24 volt. Plus, a rectifier
is required to convert from AC to DC power.
AC voltage is a pulsating type of power, while DC voltage is smooth, continuous power.
Products such as mag locks and electric strikes operate best on smooth, continuous power.
That is why DC has become the industry standard.
Magnets are be used to ''step up'' or ''step down''
voltage. We're only concerned with stepping down the voltage here.
The example shows 120 VAC being stepped down to 24 VAC.
Note that magnets only reduce the voltage, they do not change it from AC to DC.
That is the job of a rectifier, which is an add-on to the example (not shown).
If we wanted to create a technically correct drawing, we would
begin by calculating the exact number of wire wraps making up each coil.
The example converts from 120 volt to 24 volt, so the coil
relationship is 120/24. More accurately, 5/1.
This simply means for every wrap of the secondary coil, the primary coil needs 5 wraps.
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