Asynchronous motor with high slip and a variable frequency

摘要

A high slip variable frequency induction motor has a rotor including an elongate stacked lamination core (24) having a length and diameter, a plurality of electrically conducting rotor bars (26) extending through said core, each having a first end and a second end, and electrically conducting first and second end rings (30) electrically connected to the first and second ends respectively of said rotor bars. An insulating material is disposed between said rotor bars and said core thereby to at least prevent parasitic current flow between the rotor bars and said core.