CAGE ROTOR OF INDUCTION MOTOR

摘要

A cage rotor (10) includes a plurality of slots (16) for accommodating secondary conductors (18) along the periphery of a laminated core (14) fixed to a rotor shaft (12). The slots (16) pass through the core (14) in parallel with the rotor shaft, and their cross sections in a plane perpendicular to the rotor shaft are shaped substantially like an ellipse elongated along the periphery of the core, of which the major axis is D and the minor is d. To avoid stress concentration, the profile of the slot (16) has a shape such that tangential lines at given two adjacent points closest to the center of the core do not make an acute angle on the section perpendicular to the axis.