This paper investigates problems associated with the implementation of a direct torque control (DTC) strategy for an interior permanent-magnet synchronous motor drive. The DTC technique is increasingly drawing attention because of elimination of current controllers and, hence, their inherent delays, and elimination of the rotor position sensor. The latter advantage perhaps is the main impetus for considering this new approach of torque control. Problems associated with this controller, namely, the offset in the current measurements, the stator resistance variation, and the requirement of initial rotor position are addressed in this paper. Ways of mitigating of these problems are also investigated in this paper. These are evaluated with modeling and experimental studies, results of which are also presented.
The current source inverter (CSI) can be used in traction drives for electric vehicle (EV)/hybrid electric vehicle (HEV) applications to overcome the drawbacks of the voltage source inverter (VSI). These include the need for a costly, bulky, high performance dc bus capacitor, and other undesirable characteristics that negatively impact not only VSI and motor reliability but also motor efficiency. In addition, the CSI offers several inherent advantages that could translate into a substantial reduction in inverter cost and volume, increased reliability, a much higher constant-power speed range, and improved motor efficiency and lifetime. This paper discusses the operation of a three-phase traction drive CSI as a flexible battery charger including reactive power compensation for EV/HEV applications and presents simulation and experimental results to verify the operation principles.
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