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This paper addresses sensorless position and torque control of induction machines around zero frequency using inherent saliencies of a skewed rotor machine. The estimation method employs transient excitation of voltage pulses to detect machine saliencies. The resulting signals from injection based sensorless control methods are composed of components caused by saturation, slotting, as well as inter-modulation...
Sensorless control of induction machines around zero frequency can only be achieved by evaluating inherent saliencies of the machine. The signals resulting from signal 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...
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...
This paper addresses the sensorless control scheme of induction machines using transient voltage excitation at zero and low frequencies. The method is based on saliency detection through the use of pulse excitation and the evaluation of the response of the machine line currents changes. Different signal processing structures are necessary for the rotor position estimation. The estimation algorithm...
Similar to other sensorless control methods based on signal injection, the resulting signal of the transient voltage excitation is influenced, for example, by the slotting saliency, the anisotropy saliency, as well as by the saturation based saliency and its load and flux dependencies. A separation algorithm to extract the slotting saliency and saturation saliency from the resulting signal is presented...
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...
Sensorless field oriented control schemes of induction machines have been of high interest in recent years since the mechanical sensor considerably increases the cost of a drive and decreases its reliability. Methods which do not fail at zero fundamental frequency have to rely on non-fundamental effects of the motor. In the non fundamental wave model based mechanical sensorless control of AC machines...
For mechanical sensor-less control of inverter fed induction machines, a satisfactory performance at low speed down to zero fundamental frequency can so far only be achieved by using signal injection methods and exploiting non-fundamental wave effects. The voltage pulse excitation technique is applied in this paper. The main problem in signal injection based sensorless control a round zero fundamental...
Controlled operation of ac machines without mechanical sensor at the motor shaft at zero speed so far is only possible using signal injection methods and exploiting non-fundamental wave effects. By establishing a transient excitation of the machine with voltage pulses imposed by the inverter and evaluate the change of the machine line currents due to these pulses. This transient current change is...
Controlled induction motor drives without mechanical sensor at the motor shaft at low speed down to zero fundamental frequency can so far only be achieved by evaluating inherent saliencies of the induction machine. Similar to other sensorless methods based on signal injection, the resulting control signals of the indirect flux detection method by on-line reactance measurement is influenced, for example,...
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