TT using DC motor already has DC voltage regulator built-in, that is how you
adjust the speed of DC motor. There is absolutely no benefit to put a UPS in
front of it. In fact, the dirty electricity generated by UPS will pollute the rest of
your system. If your TT doesn't have a regulated power supply for the DC motor,
you will be better off to use the UPS money to upgrade the TT. UPS, in my
opinion, is the wrong solution to a most likely non-existing problem.