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30 results on '"Varatharajan, Anantaram"'

10. Sensorless control of synchronous motor drives

Author

Varatharajan, Anantaram, Pellegrino, Gianmario, Armando, Eric, Hinkkanen, Marko, Politecnico di Torino, Electric Drives, Department of Electrical Engineering and Automation, Aalto-yliopisto, and Aalto University

Subjects
Torque control, Flux adaptation, Sensorless control, Optimal current reference, Adaptive projection vector
Abstract

Accurate torque control is of interest in traction and other industrial applications, whose realization is challenged by parameters errors and temperature-induced variations. This article proposes a sensorless technique for resilient torque control in salient synchronous machines. The position observer is driven by the adaptive projection vector for the position error estimation (APP) scheme. A second projection vector, orthogonal to APP for noninterference, serves for flux adaptation. Based on the torque estimation, a model-based optimal current reference generation for maximum torque per ampere (MTPA) condition is designed to realize accurate torque control. The proposed scheme is validated experimentally on a 1.1-kW synchronous reluctance (SyR) machine test bench.

Published
2021

15. Sensorless synchronous motor drives

Author

Varatharajan, Anantaram, Pellegrino, Gianmario, Armando, Eric, Hinkkanen, Marko, Politecnico di Torino, Department of Electrical Engineering and Automation, Aalto-yliopisto, and Aalto University

Subjects
Synchronous machine, Stability analysis, Sensorless control, Projection vector framework
Abstract

This article reviews six fundamental-wave excitation sensorless techniques for synchronous machines reported in the literature. All the techniques rely on a hybrid flux observer scheme, combining the voltage and current-models of the machine, and use the flux observer error signal to track the rotor phase angle and the rotational speed. A common mathematical framework with magnetic nonlinearity is constructed for the stability analysis where each of the studied technique is represented by a unique projection vector. The dynamics of the flux and the position observer is investigated and the regions of instability are identified for each scheme under similar operating conditions. Experimental validation to support the stability analysis is reported on a 1.1-kW synchronous reluctance machine test-bench.

Published
2021

26. Sensorless Control of Synchronous Motor Drives: Accurate Torque Estimation and Control Under Parameter Errors

Author

Varatharajan, Anantaram, Pellegrino, Gianmario, Armando, Eric, and Hinkkanen, Marko

Abstract

Accurate torque control is of interest in traction and other industrial applications, whose realization is challenged by parameters errors and temperature-induced variations. This article proposes a sensorless technique for resilient torque control in salient synchronous machines. The position observer is driven by the adaptive projection vector for the position error estimation (APP) scheme. A second projection vector, orthogonal to APP for noninterference, serves for flux adaptation. Based on the torque estimation, a model-based optimal current reference generation for maximum torque per ampere (MTPA) condition is designed to realize accurate torque control. The proposed scheme is validated experimentally on a 1.1-kW synchronous reluctance (SyR) machine test bench.

Published
2021
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