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Developments of machine model and a universal controller for vector-controlled induction motor drives will be presented in this paper. The machine representations associated with vector control methods referring to various frames, including stator, rotor, and air gap flux frames, can be derived simply by selecting different state variables; thereby clearly identifying the relationship between machine modeling and vector control. Moreover, a universal vector controller for induction motor drives fed by a voltage-controlled voltage source inverter is presented. It is shown that various vector controllers, including rotor flux oriented controller, stator flux oriented controller, and air-gap flux oriented controller, can be realized by simply changing few parameters. Experimental results show that the developed universal vector controller for various vector control approaches can be implemented using the same hardware with minor change to software associated with parameters, thereby confirming the theoretical analysis.