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Deadbeat-direct torque and flux control is a flux-observer-based high-bandwidth digital closed-loop torque control law that achieves the commanded torque at the end of each switching period. When flux estimation is accurate, instantaneous torque is fed back and undesirable pulsating torque is inherently minimized. This study presents real-time flux-observer-based torque ripple estimation of a highly...
The focus in this paper is on maximizing average torque and minimizing torque ripple in synchronous reluctance machines, using finite element-based design optimization. The procedure is based on using fully parametrized geometries of the machine's magnetic circuit. Crucial dimensions of the rotor geometry were incorporated into the optimization process. The main idea to reduce torque oscillation is...
DB-DTFC is a flux-observer-based high bandwidth digital, closed-loop torque control law that achieves the commanded torque at the end of each switching period. When flux estimation is accurate, instantaneous torque is fed back and unwanted pulsating torque is inherently minimized. This research presents real time flux-observer-based torque ripple estimation of a highly nonlinear synchronous reluctance...
This paper presents the design and comparison of two types of synchronous reluctance machines. The compared machines differ in their respective type of winding: One is equipped with a conventional full pitch distributed winding while the other one imparts an integer slot concentrated winding. Challenges for the application of concentrated windings to synchronous reluctance machines are examined. The...
This paper presents crucial design considerations for the application of concentrated windings to synchronous reluctance machines. Challenges for the application of concentrated windings to synchronous reluctance machines are examined. The tradeoff between a winding configuration with high winding factor and low space harmonic content is carved out. A new approach improving the performance of concentrated...
This paper applies deadbeat-direct torque and flux control (DB-DTFC) to minimize machine and inverter losses in synchronous reluctance drives each single switching period. Flux linkage-based loss models for machine and inverter considering nonlinear effects such as cross-saturation and temperature changes are experimentally evaluated. Loss minimizing capabilities are demonstrated comparing three different...
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