Implementation of a high-performance induction motor drive using a three-phase inverter module, a PWM ASIC and a DSP

This paper presents the hardware implementation of an indirect field-oriented-controlled induction motor drive using an application specific integrated circuit (ASIC), the 40 MHz TMS320C25 digital signal processor (DSP) and a three-phase inverter power module. The main purposes of this implementation are (a) to redistribute low-level control decisions to other on-board subsystems in order to better utilize the system computational resources, and (b) to simplify the design of the inverter stage and its associated controller. The use of an ASIC performing the PWM function relieves the DSP from this task allowing for greater system flexibility and increased computation time for more sophisticated control algorithms. The use of power modules offers simpler system design, greater fault tolerance (leading to higher system reliability), and a reduced system footprint due to a compact “building block” design hierarchy which reduces part count, mass, and volume. The system architecture and detailed schematics are presented. Experimental results illustrate the feasibility of the proposed ideas when the designed drive is controlling the speed of a 2 HP induction motor using a model-reference adaptive speed controller