Title :
A novel dynamic overmodulation strategy for fast torque control of high saliency ratio AC motor
Author :
Bae, Bon-Ho ; Sul, Seung-Ki
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., South Korea
Abstract :
This paper describes the dynamic overmodulation strategies for the fast torque control of high saliency ratio AC motor. In the case of the high saliency ratio AC motor, the dynamic control of both d- and q-axis currents is required for the fast torque control with optimal efficiency. But because the stator inductance is designed large enough to generate desired reluctance torque, in transient operation with high current control bandwidth, the d- and q-axis current regulators are easily saturated even at low speed. By the conventional overmodulation strategies, owing to the high saliency ratio, the performance of the current regulator is more severely deteriorated than the case of the nonsalient motor. In this paper, the drawbacks of the conventional overmodulation strategies are investigated and a dynamic overmodulation strategy is proposed to improve the current response at fast transient and an algorithm for the effective implementation is given. The control performance of the proposed strategy is confirmed by the computer simulation and experiments with a 3.75 kW axially laminated synchronous reluctance motor and an IPMSM for 42 V integrated starter generator (ISG).
Keywords :
AC generators; electric current control; machine control; machine theory; permanent magnet motors; reluctance motors; starting; torque control; 3.75 kW; 42 V; axially laminated synchronous reluctance motor; computer simulation; current regulator performance; current response; d-axis currents; dynamic control; dynamic overmodulation strategy; fast torque control; high current control bandwidth; high saliency ratio AC motor; integrated starter generator; nonsalient motor; optimal efficiency; q-axis currents; stator inductance; transient operation; AC motors; Bandwidth; Current control; Inductance; Optimal control; Regulators; Reluctance generators; Reluctance motors; Stators; Torque control;
Conference_Titel :
Industry Applications Conference, 2002. 37th IAS Annual Meeting. Conference Record of the
Conference_Location :
Pittsburgh, PA, USA
Print_ISBN :
0-7803-7420-7
DOI :
10.1109/IAS.2002.1043753