Symmetry and eld-oriented control of induction motors
نویسندگان
چکیده
In 1974 Blaschke and Hasse introduced the so called eld-oriented method for the control of induction motors [1, 5]. This method is based on a nonlinear coordinate change, admitting a clear physical interpretation since corresponding to a rotation by the rotor ux angle. In these coordinates the equations of the induction motor are very similar to the equations of a DC motor. Since the control of DC motors is much simpler and better understood, eld-oriented methods have become very popular. This paper is devoted to a symmetry interpretation of eld-oriented control methods (see, e.g., [4] for related works on symmetry and control of linear systems). We show that:
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