Search results for: T.M. Wolbank
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For speed sensorless control at zero electrical stator frequency inherent machine saliencies need to be exploited. One way to obtain saliency information is to use the voltage step excitation of the inverter and evaluate the current reaction by estimating the derivative of the current from the measured current slope. The initial transient oscillation of the current slope prohibits estimation of the...
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Usage of sustainable energy is a key factor for solving future environmental issues. The purpose of the project SustEner is to modernize sustainable electrical energy vocational training by enhancing existing or establishing new training methods in enterprises and education. This paper presents the SustEner module power management techniques in hybrid electrical cars. Increasing market demand for...
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In variable speed drive applications the inverter fed induction machine is one of the most reliable systems. However, increasing demands on efficiency leads to higher wear of all system components. Unexpected machine breakdowns cause economic losses and/or undesired scenarios in safety-critical areas. Thus condition monitoring of all components can reduce the risk of outages due to faults. High electrical...
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2012 15th International Power Electronics and Motion Control Conference (EPE/PEMC) > DS2a.10-1 - DS2a.10-6
The inverter fed induction machine is becoming one of the most important drive application due to speed variability, dynamics, and robustness. These advantages are possible by the development of high-power transistors. On the other side these fast switching components lead to steep voltage rises and high stress on the winding insulation of the machine. Faults in the winding system of a machine can...
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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...
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In modern inverter fed drive applications the power semiconductors used are typically designed to operate at their maximum thermal operation conditions. Semiconductors worst case thermal considerations in general define the uppermost inverter switching frequency dependent on maximum load current. Fixing this frequency to a constant value, the drive will not be operated with best possible performance...
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IEEE Transactions on Industrial Electronics > 2010 > 57 > 1 > 365 - 374
The sensorless control of induction machines, particularly for operation at low speed, has received significant attention in recent years. To realize a field-oriented control of AC machines that is able to work at zero speed, the most commonly used methods are either sensor-based models or transient-signal-excitation methods. The major disadvantage of present signal-injection methods is that they...
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The paper describes distance a laboratory for motion control system. Designed system allows system identification, parameter tuning and speed and position control loop design. Learning objectives are clearly defined and their verification is included too. Designed distance laboratory provides the user with a practical experience in Power Electronic and Motion Control education.
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Rotor cage fault detection in inverter fed induction machines is still challenging nowadays as dynamics introduced by the control or the load influence the fault indicator signals usually applied. In addition, the detection is usually only possible when the machine is operated above a specific load level to generate a significant rotor current magnitude. This paper proposes a new method to detect...
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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...
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Pulse-width modulated power converters are currently the most widespread solution in industrial drive applications. The common trend in converter development is to operate all system components at, or - for short durations - even above their rated values. At system configurations where the inverter is operating at its thermal limit different points of operation of a connected machine require special...
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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...
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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...
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The common trend in converter development is to increase the drive system performance with simultaneous consideration of cost reduction by operating the whole drive at its thermal limit. For this purpose all system components are, for short durations, even stressed above their rated values. Because thermal losses have to be well balanced it is necessary to adjust inverter switching frequency to its...
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The paper deals with basic philosophy and structure of remote controlled laboratory for experimentation in electrical engineering. PEMCWebLab project provides the user with a practical experience in industrial electronics education. It is designed based on leading ideas and has clear targets. In this paper laboratory for the course motion control is introduced. First of all description of the system...
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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...
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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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To realize a field oriented control of ac machines that is able to work at zero speed the most commonly used methods are either sensor based models or transient signal excitation methods. In this paper a new evaluation algorithm based on phase current derivation to extract the flux position information is presented. This method is working without additional transient excitation of the machine and...
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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...
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2008 IEEE Power Electronics Specialists Conference > 2844 - 2849
In this paper the influence of the non-ideal behavior of power electronics, sensors, and signal processing on pulse signal injection based speed sensorless control is addressed and investigated. The speed sensorless control signals are obtained from the transient current response resulting from an excitation of the machine with voltage pulses. The investigation is focused on sensorless control of...
