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Direct current electric machine systems had been adopted in a variety of industrial applications for more 100 years for convenience of torque and speed control. During the past 30 years, with the development of power electronics, digital signal processors (DSPs), and computer-aided design technologies, AC motors have replaced DC motors and have become dominant in variable frequency motor applications. Currently, various types of AC motors like induction motor (IM), electrically excited synchronous motor (EESM) or permanent magnet synchronous motor (PMSM) and switched reluctance machines (SRM) are widely used in mine-hoisting, metallurgy, metal-rolling, bottling system and marine propulsion, particularly in the field of high-power industrial drives [1].

Design and Simulation of Coordinated Speed Controller for Multiple Electrically Excited Synchronous Motors