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Yes, that's right, it's a shelf transformer, so I won't buy a 25.5Vrms (18V) transformer. I'm using it to power my motorcontrol for an electric car motor.
Since you're using this as a supply for a motor controller, the voltage probably doesn't have to be tightly regulated. For that matter, it also probably can tolerate a lot of ripple.
Re-check the controller specs and see what the maximum and minimum input voltages really are. If it's a closed loop PWM, there might be a lot of range.
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