1. Institute of Engineering Sciences, Universidad de O'Higgins, Rancagua, Chile
2. Department of Electrical Engineering, Faculty of Physical and Mathematical Sciences, University of Chile, Santiago, Chile
3. Department of Mechatronic Engineering, Instituto Tecnológico de Costa Rica, Cartago, Costa Rica
4. Electrical Engineering Department, Technical University of Denmark, Copenhagen, Denmark
5. Research and Development Department, Siemens Drives Technology Unit, Congleton, U.K.
6. Power Electronics, Machines and Control Group, University of Nottingham, Nottingham, U.K.