Conference Paper

Modeling and experimental approach of a novel direct torque control scheme for interior permanent magnet synchronous machine drive

Sch. of Elec. Eng. & Tele., New South Wales Univ., Sydney, NSW, Australia
DOI: 10.1109/IECON.2002.1187513 Conference: IECON 02 [Industrial Electronics Society, IEEE 2002 28th Annual Conference of the], Volume: 1
Source: IEEE Xplore

ABSTRACT A novel DTC control scheme for interior permanent magnet synchronous machine is proposed in this paper, which features in low torque and flux ripple and almost fixed switching frequency, by means of space vector modulation (SVM). The torque and flux ripples have been significantly reduced, compared with those of the basic DTC reported in the literature.

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    ABSTRACT: In this paper a new method for direct torque control (DTC) based on load angle control is developed. The use of simple equations to obtain the control algorithm makes it easy to understand and implement. Fixed switching frequency and low torque ripple are obtained using space vector modulation. This control strategy overcomes the most important drawbacks of classic DTC. Results show the feasibility of the proposed method, obtaining good speed control bandwidth while overcoming classic DTC drawbacks.
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    ABSTRACT: The permanent magnet synchronous motor (PMSM) is becoming more and more attractive due to its high efficiency and high torque to current ratio. The direct torque control (DTC) scheme has a great potential for PMSM drive systems because of its fast torque response and the possibility of eliminating mechanical sensors if the initial rotor position is known. In this paper, an improved model by considering structural and saturation saliencies of a surface-mounted PMSM (SPMSM) is proposed. The non-linear inductance versus rotor position of a testing SMPMSM is modelled and experimentally measured. The new SMPMSM model is applied to a conventional DTC drive system. Dynamic simulation of the system is carried out, and compared with those from the embedded model in the Simulink library to verify the effectiveness of the derived model.