Main Question or Discussion Point
For contra-rotating motor, the external rotating element is a cylinder that carries copper coil and on account of electrical resistance, the coil is getting heated. The generated heat can be removed only by circulating oil around the coil through cavities/vents available inside the cylinder that holds the copper coil. However, as both the stator and rotor are rotating how can the oil be carried into and out of the cavities? any Idea?
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