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In sine-triangle (ST) pulse width modulation (PWM), the carrier frequency is chosen to be an odd-triplen multiple (e.g., 3, 9, 15… etc.) of the modulating signal frequency in order to maintain the three-phase symmetry among the three pole voltages. However, for ST PWM with non-triplen pulse numbers (e.g., 5, 7, 11… etc.), the three-phase symmetry is not maintained. This paper studies the influence...
This paper deals with the analysis of induction motor (IM) with an intentionally created saliency, rearranging the rotor bar geometry, so as to allows a sensorless detection of the IM rotor position. A finite element (FE) procedure, based on the d- and q-axis model of the IM, is used to compute the d-and q-axis parameters of the machine. The proposed procedure is useful for both analysis and design...
This paper investigates the opportunity for energy saving in a three-phase induction motor (IM) driving pump load and proposes an improved loss model control (LMC). Compared with other power-loss reduction algorithms for IM, the presented one has the advantages of fast and smooth flux adaptation, high accuracy, and versatile implementation. The performance of LMC depends mainly on the accuracy of...
In this paper, the test voltage injection coupled with tracking of magnetic saliencies created by saturation and rotor slotting was used for shaft sensorless speed control of induction motor drives at zero and low speed. Method does not require additional wire connections and is usable for star or delta machine connection. The paper is proposing low memory method of elimination saturation effect from...
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