Yes, there are ways to build a torque device that will not HEAT UP..or at least will stay cool enough to last a life time. You do not indicate the type of continious drive you are using, and thus how much energy is going into the system. This,of course must be dissipated as heat energy...
Looking for the BASIC equations for the fresh water from ocean water. This being the EXTRA energy, if any, needed to boil off a given quantity of water from salt water as compared to a fresh water system.<br>
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The standard steam tables do not reflect the extra energy to release the first...
as others have suggested. you can use a 180 Volt DC MOTOR and use a variable power supply all this to run off a 240 VAC 50 or 60 HZ. .. The standard AC motors need to run at the same frequency as to current limit the motor thru the inductance of the motor windings. As frequency goes up...