Darko P. Marcetic

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This paper presents a new technique for online identification of an induction motor rotor time constant. The technique is designed for a shaft-sensorless indirect field-oriented control induction motor drive with a model reference adaptive system (MRAS)-based speed estimator. The MRAS estimator is sensitive to the changes in the rotor time constant, and(More)
This paper proposes an improved and robust method of minimizing the error in propulsion-drive line-currents that are reconstructed from a single dc-link current measurement. The proposed algorithm extends and then shortens the relevant phase pulse-widths in order to provide optimal sampling of the dc-link currents in two consecutive pulsewidth modulation(More)
A strong jerk which can cause passengers discomfort occurs when electric elevator starts and stops. If uncontrolled, the jerk have influence on the electrical and mechanical subsystem performance and reduce the system life expectance. Modern drives have ability to control speed, so we can indirectly control the jerk. This paper describes the control of real(More)
This paper presents a modified IPMSM model suitable for use with carrier-signal-injection-based sensorless methods. The suggested model includes magnet saturation of both dand qaxis and cross-coupling which all result in more accurate description of high frequency test signal propagation. The model is verified by comparing experimental results of a(More)
This paper presents improved torque control scheme for a high speed sensorless induction motor drive. The proposed high speed torque control scheme substitutes the flux oriented control by the voltage angle control in the flux weakening regime. This scheme uses maximum of available inverter voltage, alleviates well known problems of current control schemes(More)
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