ROTOR COOLING APPARATUS

摘要

A brushless permanent magnet electric motor or generator having a hollow rotor, is provided with apertures in ends of the rotor. The apertures allow air to flo w through the center of the hollow rotor and remove heat from the rotor. Vanes or blades c an be fixed to the shaft within the rotor or fixed to ends of the rotor to force air throug h an interior of the hollow rotor. Ends of the rotor can be shaped to form fan blades that draw a ir through the interior of the rotor. Air flowing through the rotor can be recirculated by flowing back through passageways formed between the stator and the motor/generator casing , through passages through the stator, and/or back through an air gap between the stat or and the rotor.