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A new Lagrangian formulation with complex currents is developed and yields a direct and simple method for modeling three-phase permanent-magnet and induction machines. The Lagrangian is the sum a mechanical one and of a magnetic one. This magnetic Lagrangian is expressed in terms of rotor angle, complex stator and rotor currents. A complexification procedure widely used in quantum electrodynamic is...
Sensorless control of ac machines which is able to work even at zero speed can be realized using high frequency excitation. Different schemes have been presented recently, which use transient excitation caused by the switching of the voltage source inverter. Transient excitations of only one pair of test vectors are applied for each measurement in this paper. The signals resulting from transient excitation...
Control of induction machines without encoder around zero frequency can only be achieved by evaluating inherent saliencies of the machine. The signals resulting from injection based sensorless control methods are composed of components caused by saturation, slotting, or anisotropy saliencies, as well as inter-modulation effects. In addition there is a strong influence of the load level on some components...
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