Polyphase Induction Motor with Solid Rotor; Effects of Saturation and Finite Length

An expression for the equivalent impedance of a solid rotor induction mnotor is derived, which includes the effects of saturation and finite length. Saturation effect is allowed for by the assumption of a rectangular magnetization curve while the finite effect is given in the form of an end effect factor, obtained from the solution of a three-dimensional field problem. Tests made on experimental motors with and without heavy copper end rings showed good correlation with calculated results.