Rotor for high-speed asynchronous electrical machine - has material removed from teeth defined by axial slots to restrict flux path

摘要

The rotor has axial grooves (2) running parallel to the generatrices of the rotor defining peripheral teeth (3). The teeth (3) each have material removed at the level of the base of the slots (2), by machining a bore through each tooth at its centre, or by machining a circular or semi-circular groove through the base of each slot (2) of larger dia. than the slot width. The machined bores or grooves provide a restriction of the flux to obtain virtual separation of the electric circuit from the magnetic circuit, so that the performance of the motor is closer to that of a motor with a smooth rotor. The motor employing this rotor can be used to drive a turbo-machine.