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Undesired low-frequency self-sustained speed oscillations are encountered in fan, compressor and pump drives utilizing open-loop frequency-controlled induction motor drives. Discontinuous rectifier current at light loads and the dead-time of the inverter switches are the main sources of such oscillations. This paper proposes a concise analytical method to predict the risk of self-sustained oscillations...
The full-order Luenberger flux observer (FOLO) combined with adaptive techniques is the most widely used method for sensorless induction machine (IM) vector controlled drives. However, IM model-based sensorless schemes have an inherently unstable region under regenerating conditions. Additionally, the stator resistance is also required at low speeds, which leads to a complicated multiple-input multiple-output...
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