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Wound rotor synchronous machines enable a large variety of approaches for carrier signal based sensorless control since the rotor voltage serves as an additional input to the system and the rotor current as an additional, easy to measure, state variable. Consequently it is possible to use the rotor winding either as the transmitter or as the receiver of a carrier signal. In these cases the mutual...
Sensorless position estimation based on signal-injection methods always requires a resistance- or inductance-based anisotropy. Therefore, a short-circuited electrical winding can be attached on the rotor. As will be derived in this paper, this method leads to both a resistance- and inductance-based saliency. By an experimental test setup, both saliencies are analyzed and compared towards their accuracy...
The conventional approach to control synchronous machines without a motion sensor in medium and high speed range is model-based and evaluates the electromotive force (EMF). In this case the information about the rotor position is included in the fundamental wave of the EMF and therefore the presence of harmonics will distort the estimation result. In order to compensate for harmonics information about...
Advanced control techniques for wound rotor synchronous machines need precise machine models. Often a simple fundamental wave model is used to design the control algorithms. Using such a model, it is not possible to account for non-ideal effects that distort the control algorithm. Therefore a general machine model is derived by extending classical winding function theory. This analytical machine model...
Wound rotor synchronous machines open up new possibilities in carrier signal based sensorless control since the rotor voltage serves as an additional input to the system and the field current as an additional, easy to measure, state variable. Approaches for sensorless control of PMSMs use the stator as the transmitter and as the receiver of the carrier signal. A new alternative for wound rotor synchronous...
This paper presents a new carrier signal based approach for motion sensorless control of electrically excited synchronous machines. In the case of permanent magnet synchronous machines sensorless control at standstill and low speed is mostly done by injecting a high-frequency voltage and evaluating the resulting current response. Hence, the stator is used as the transmitter and as the receiver of...
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