AC induction servo sizing for motion control applications via loss minimizing real-time flux control

A design procedure for induction machine servo motion control applications that can be used to optimally select the minimum size machine and/or to obtain optimal time performance from a given machine is presented. The basis of the technique is in modeling and controlling of machine losses. In motion control servo applications, the position and velocity trajectories are often specified. For such cases, the rotor flux is a dynamic variable that dramatically affects the machine losses. By dynamically manipulating the flux, the losses can be minimized. To implement the design analysis, a dynamic programming tool is used. Its output is the minimal loss flux trajectory for a given cycle or for the minimum cycle time for a given thermal capability. The minimal loss flux trajectory is then modeled in reduced form for real-time implementation. Theoretical and experimental results demonstrate substantial performance advantages from such an approach