The AC polynoid derives its name from the solenoid but the
similarity stops there. Unlike a solenoid, the polynoid is
a linear electric motor.
The AC Polynoid provides a constant force for the entire
length of its stroke. Its direction of travel is reversible
by switching with equal force in both directions. Switching
requires the swapping of any two of three motor leads in three-phase
units while single-phase reversing is done by the swapping
of one line lead to the opposite side of the capacitor lead.
Electrical force reversal can be used for dynamic braking.
A polynoid is comprised of two basic parts, a rod and a stator.
The rod is copper clad steel, the end of which can feature
a tapped mounting hole. An optional holding coil is available
for end holding at one or both ends. The stator is a series
of coils wound on bobbins. Coils are interconnected. The stator
is housed in a smooth cold rolled steel assembly. It is also
available finned for greater heat dissipation.
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