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How to Know If Your Power Supply Output DC or AC Voltage

Sometimes we get complaints from synchronous AC motor users that their’s motor does not work. We can not find the proper reason until we got a picture of her or his power source.

We all know that “+” is positive, “-” is negative. Power source like the pictures below has defined DC clearly.

But the many kinds of power does not make “DC” or “+” “-”, see below

They have same symbols — and — Let see what is Wikimedia say “An example of the Direct Current symbol”.

And they also have symbol + and -, which distinguish positive and negative of the DC plug.

So, all of the power sources which has symbol above should output DC(Directly Current), which will not suit the TYC-40 or 30 synchronous motors.