Re: Newbie (ignorant) tech question


"Dan Beck" <biscuitbecks@*nospam*cableone.net> schreef in bericht
news:12pt4sgkas5iff2@xxxxxxxxxxxxxxxxxxxxx
Hello all,

I have a constant duty AC (28 VAC) motor that runs in one of my pinball
machines. I wish to control power to the motor such that it only runs
during gameplay. There are "recipe" circuits that do this for DC motors
that do the same thing, in pinball machines. The heart of this "recipe"
circuit is a TIP125 transistor. Will this transistor work in an AC
voltage circuit?, Or, is control of AC motors more complicated than I am
anticipating?

Thank you for any and all responses!

Regards,
Dan


Dan,

No and no. A tip 125 definitively cannot switch an AC circuit and control of
an AC motor is not more complicated than DC.

First of all, how is the motor controlled now? Is it controlled anyhow? Or
is it (or its 28VAC power source) directly switched by the mains? You need
to find or to make some signal telling the machine someone is playing. That
signal can be used to switch a relay or a triac which in turn switches the
motor. Take into account that the motor will need some time to be fully
operational after switching on. After switching off, it has also come to
full standstill before it is safe to turn it on again.

petrus bitbyter


.

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