Most all mag drives are induction. You should be able to run it on a variac, but be warned that running it too far under spec can cause damage on that type of drive unit. Synchronous motors are easy to spot because they require an induction based starter in order to get them to synchronous speed. A centrifugal pump with a synchronous motor would be mighty expensive to buy. Since danners are not, I would suspect they are induction. It would not hurt to try running the variac. If you tune the variac down and the speed does not change, or the pump stops spinning, then you know that it is synchronous.
Let us know how it goes.
I would highly suggest not putting it below 80VAC.
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