CAGE ROTOR FOR HIGH-SPEED INDUCTION MOTOR

摘要

A cage rotor (10) comprises a laminated core (14) fixed to a rotor shaft (12); a secondary conductor (18) arranged in a plurality of through holes (16) made through the laminated core (14); a pair of end rings (20) connected to the secondary conductor (18) at both ends of the laminated core (14) in the axial direction; and a pair of reinforcing members (22 and 23) covering the end rings (20) respectively. The secondary conductor (18) and end rings (20) are integrally formed by casting, and connected to the laminated core (14) and reinforcing members (22 and 23). The reinforcing members (22 and 23) are made up of annular elements made of a highly rigid material, and are provided with the cylindrical walls (26 and 27) enclosing the cylindrical outer periphery of the end rings (20), and the multi-hole walls (28 and 29) sandwiched between the respective end rings (20) and the laminated core and having a plurality of holes (32) communicating with the through holes (16) of the laminated core (14), and end walls (30 and 31) which contact with the outer ends of the end rings (20) in the axial direction.