| Abstract |
This paper describes two CAD programs (PC-SRD and PC-BDC) for the design of brushless DC and switched reluctance motors and their power-electronic controllers, suitable for use on personal computers or workstations. The programs are used for "sizing", for system design, and for simulation of brushless DC and SR drives. Specially developed algorithms minimize computation so that a large number of designs and parameter-changes can be evaluated in a short time, permitting the use of a shell programm that performs "ranging", with graphical output that enables the designer to select optimal parameters. The programs are unique in their use of state-space averaging to obviate the need for time-stepping integration of the differential voltage equations at low speed. In addition to the performance parameters for the motor and the complete system, the programs calculate peak, mean, and r.m.s. currents in all the transistors and diodes of the power electronic controller and over 100 other performance parameters. Also described are the software-engineering aspects. PC-SRD and PC-BDC deliver to their users an order-of-magnitude gain in engineering productivity compared with traditional design software techniques. This gain is achieved by the integration of all or most of the design tasks, and is made possible by the recent development of powerful PC-based development environments, compilers, and operating systems with high-level languages, object-oriented programming and advanced graphics and windowing. |
