Patent ID: 7902487

Claim:
A system for controlling shaft heating, comprising: an electrical induction device; a probe automatically calibrated based upon a material of construction of a shaft of an electric motor; and a control system configured to: control an application of heat from said electrical induction device to a slow roll sensing area of said shaft for a predetermined time interval, said application of heat sufficient to reduce an electrical runout associated with a measured first slow roll value, said first slow roll value determined based on one or more measurements obtained from said probe, said heat applied according to a heat treatment profile, said heat treatment profile comprising said predetermined time interval, a predetermined temperature, and a predetermined depth from an outer surface of said shaft; measure a first slow roll value in said slow roll sensing area with said probe; permanently alter a grain structure of said shaft by said application of heat based on said first slow roll value; and control said application of heat to said slow roll sensing area automatically responsive to an automatic determination of a set point for one or more of an electrical current, electrical voltage, and electrical frequency.