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The paper presents a new approach for detection of broken rotor bar fault in squirrel cage induction motors operating under varying load conditions. A mathematical model used in the presented method was developed using winding function approach to provide indication references for induction motor parameters under load variation. The model shows a strong relationship between broken rotor bar fault...
In this paper, a microprocessor-based PMSM drive with three hall-effect sensors for detecting rotor position is studied. First, three PMSM control methods, namely 120° six-step with current limit, 180° six-step with current control, synchronous frame vector control, are compared based on some key performance indexes, such as vibration, acoustic noise and efficiency. According to the analysis, a PMSM...
This paper presents a reliable speed tracking strategy without mechanical position sensors of a permanent magnet synchronous generator applied in power regeneration of hybrid hydraulic excavators. The sensorless scheme is based on flux linkage estimation and with an additional novel compensation. It is devised to take the stator resistance into account, which is sensitive to the environmental temperature...
Operation characteristics of doubly fed wind turbine generator system under grid voltage unbalance conditions are analyzed. In order to restrain various pulsations, a coordinated control strategy of rotor-side and grid-side converters of a doubly fed induction generator (DFIG) is presented. Taking the pulsations of electromagnetic torque, stator reactive power and system total output power at double...
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