DC motor questionsAll, I am making, or at least attempting to make, an electric high speed spindle that fits in a confined space. I do not want to use air as the motive force. So I have been experimenting with BLDC motors made for model airplanes and the like. I would like to cool the stator, I think I may need to in fact if I want the motor to run continuously. Liquid cooling would be best. To do this most efficiently the stator should be submerged in the cooling liquid. There is not enough space between the windings for even very small diameter tubes carrying fluid to fit through. So if the stator gets submerged the liquid must be constrained to the stator only. I thought about making plastic end caps for the stator and sealing the perimeter of the stator with a sheet of plastic or maybe plastic and some sort of metal sheet. The motor is built with the outer rotating, inside out compared to most motors we see, but common in floppy drives. There is about .008" air gap between the outer diameter of the stator and the magnets. I'm afraid that if I use brass sheet, for example, to wrap around the stator it will short out the laminations and increase eddy current losses in the motor. If the brass sheet could be insulated from the laminations would eddy currents in the brass sheet start to heat it significantly? This is a 1000 watt motor and the stator is about 1.18 diameter x 1.18 long (30mm x 30mm). If the stator can be wrapped with something to seal it what kind of fluids would not tend to soften varnish on the windings? Anybody here know? Thanks, Eric
- posted
9 years ago