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An ever increasing demand for lighter rotating machinery and higher operating speeds results in a raised probability of instabilities. Rotating damping is one of the reasons, instability occurs. Rotating damping, or rotor internal damping, is the damping related to all rotating parts while non-rotating damping appearing in the non-rotating parts. The present study describes a rotating setup, designed...
Renewable and dispersed electrical generators can be divided into systems directly coupled to the grid, or systems which use power electronic converters for grid connection. A lot of generation is still done by an induction machine directly coupled to the grid, for example in micro combined heat power or small wind turbines. For asynchronous generators directly coupled to the grid, the voltage distortion...
By counting the step command pulses, stepping motors can be straightforwardly used for open loop positioning. However, open-loop control is often insufficient to guarantee accurate and energy efficient movements. More intelligent stepping motor algorithms can meet these concerns, however, this requires position information. The back EMF signal contains useful information on the rotor position. This...
Induction machines usually have a reduced efficiency when supplied with non linear currents. Most of the induction machines are not used at nominal loading, but at a 60% loading rate. In the paper it will be shown that derating factors for induction motors fed with nonlinear currents, like the NEMA MG1 or the IEC 60034-17, are correct for nominal loading. At lower loading these derating factors can...
Stepping motors are used in numerous applications because of their low manufacturing cost and simple speed control. It is well known that their energetic efficiency is low but actual values are typically not available. In this paper the influence of the control algorithm on the efficiency of the stepping motor is analyzed, measured and discussed. For a good comparison of the efficiency for the different...
Recent research on stepping motors concerns intelligent motion control algorithms such as sensorless vector control. Sensorless control is commonly based on a motor model. For stepping motors, this model is highly nonlinear, resulting in a high computational cost. When the motor is controlled by a vector-controlled algorithm, the position dependence of certain model parameters can be eliminated. If...
Recent research on stepping motors concerns intelligent motion control algorithms such as sensorless vector control. Sensorless control is commonly based on a motor model. For stepping motors, this model is highly non-linear, resulting in high computational cost. In this paper it is shown that the motor model can be transformed into a linear model, if the stepping motor is controlled by a vector-control...
Today's economic environment drives the adoption of strategic intitiatives. At one hand there is the interest in different management philosophies, such as Lean manufacturing. On the other hand manufacturers see a greater need to adopt, upgrade or expand their enterprise IT solutions. As real-time information is crucial, the support for the company's strategic initiatives must be considered in the...
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