Enhanced Rotor Field-Oriented Control for Low-Voltage Delta Inverter-Fed IMs With Look-Up Table Implementation

This paper introduces an innovative rotor field-oriented control (RFOC) approach tailored for a low-voltage three-phase induction motor (IM) driven by a reduced-structure delta inverter (B3-VSI). The delta inverter, featuring only three power switches, three freewheeling diodes, and three DC voltage sources, represents a promising solution for cost-effective, low-power applications, such as electric vehicles (EVs) and photovoltaic (PV)-fed systems. However, due to the limited voltage vectors provided by this inverter topology, advanced control strategies are essential for achieving optimal motor performance. The proposed RFOC method utilizes a look-up table to generate the control signals for the inverter switches. This table is developed through precise selection of the Boolean variables produced by hysteresis controllers applied to the stator currents. Simulation and experimental results validate the proposed approach, demonstrating its potential to improve system performance in low-power applications while maintaining simplicity and efficiency.