Microprocessor techniques in electrical variable speed drives - A design methodology

This paper deals with the methodologies of application of microprocessors to electrical variable speed drives in order to carry out speed or torque control and monitoring functions. During the design phase two relevant technical aspects are to be particularly considered: (1) the simulation of the complete system (electrical machines, static power converters, control circuits), which allows a prior knowledge of dynamic and steady state system behavior; and (2) the procedure that must be used in order to define the software and hardware structures of the parts of the system when are implemented by microprocessors. The possibility of testing the control circuit on an electrical machine converter model implemented on an analogue computer is pointed out. Some examples of utilizations of the above methodologies are also reported.