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.
[Show abstract][Hide abstract] 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.
"The proposed scheme possesses some attractive features compared to the conventional current-controlled drives like field oriented control (FOC). Later on, Tang et al. proposed a DTC control scheme for the IPM featuring almost fixed switching frequency . In 2002, Rahman et al. proposed a completely sensorless DTC control for an IPM drive, which uses a new speed estimator from the stator flux linkage vector and the torque angle . "
[Show abstract][Hide abstract] 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.
[Show abstract][Hide abstract] ABSTRACT: In this paper a new DTC scheme for interior permanent magnet synchronous machine (IPMSM) is proposed. The proposed DTC scheme having the advantages of low torque ripples as well as constant switching frequency. The increment in the switching frequency requires neither an increase of the sampling frequency nor high frequency dithering signal injection. Here in the proposed scheme, a model based observer is used to generate the optimal reference voltage vector. Furthermore, a well developed space vector modulation technique is applied to inverter control in the proposed scheme using a DSP-based hardware, thereby reducing the torque ripples and increasing the switching frequency which becomes constant. To illustrate the performances of the proposed control scheme, simulation and experimental results are presented.
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