Abstract
This research aims to develop a controller for aircraft starter/generators using a digital signal processor (DSP) TMS320C25. A starter/generator is a DC machine carrying on two reverse operations - motor and generator. The whole control activity includes current control for motor operation, voltage control for generator operation, and electronics actions in the transitions for mode changes. Field control is the key issue of this research. A PWM DC chopper is employed for the field drive. A switching type of shunt field resistances is proposed to armature current control so that the motor operation can maintain sufficient output torque for engine starting. A DSP voltage regulator is prototyped and verified. The switching nature of the PWM drive makes variable structure control (VSC) a reasonable choice for control design. The experimental results demonstrate that VSC has much better performance than a continuous PI controller. Robustness tests against rotating speed and load current variations also give supporting results
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