When it's set up, I like to run my 182 stationary crane on D.C. because it is so much quieter.
I never noticed coils overheating. I guess the coil might run hotter on DC than AC at any given voltage, but generally, the voltage can be set lower when using DC. Maybe that balances out the extra heat.
Never had a problem with the solenoids becoming magnetized and sticking. The electromagnet would become magnetized. I addressed this by putting a bypass switch in the power supply. When the electromagnet became magnetized, I would run the accessory on AC for a minute or so to demagnetized it.
As Stan mentioned, some vibrator accessories run better on 1/2 wave DC. In fact, the 362 Barrel Loader had a rectifier built in.
In my experience, on some accessories the direction of "rotation" changed when I tried 1/2 wave DC.
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