Slobodan N. Vukosavic

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— This paper deals with the problem of mechanical resonance in modern servo drive systems having the speed control loop bandwidth and resonance frequency above 100 Hz. To enable the extension of the range of stable gains in the presence of flexible coupling, a simple and straightforward modification of the speed loop controller is proposed in order to(More)
—The paper analyses a recently introduced two-motor five-phase drive system with series connection of stator windings. It has been shown, using physical reasoning, that introduction of an appropriate phase transposition in the series connection of two machines leads to a complete decoupling of the flux/torque producing currents of one machine from the(More)
—This paper proposes a practical digital-signal-processor (DSP)-based algorithm for the online efficiency optimization of induction motor drives. The algorithm combines good features of the search control and loss-model-based control, while simultaneously eliminating their major drawbacks. It ensures very fast convergence without the need for any a priori(More)
Since variable speed electric drive systems are supplied from power electronic converters, it is possible to utilise AC machines with a phase number higher than three. It is shown in the paper, using general theory of electrical machines, that an increase of the stator phase number to at least five (or more) enables completely independent vector control of(More)
This paper analyzes a six-phase two-motor drive, consisting of a six-phase voltage-source inverter (VSI), a six-phase induction machine, and a three-phase induction machine. Stator windings of the two machines are connected in series in an appropriate manner. This enables full decoupling of the dynamics of the two machines by means of vector control.(More)
The temporal and spatial distribution of GAP-43 mRNA in early human development, from 6 to 23 gestational weeks (g.w.), was examined by in situ hybridization histochemistry. GAP-43 mRNA was expressed as early as 6 g.w. in all regions of developing nervous system, the spinal cord, brainstem, cerebellum, diencephalic and telencephalic regions. Although the(More)
A novel concept for multi-drive systems, based on utilisation of multi-phase machines, has been introduced recently. It has been shown that, by connecting in series stator windings of the multi-phase machines in an appropriate manner, it becomes possible to control all the machines in the group independently using vector control principles, although the(More)
—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 letter proposes a model reference adaptive system (MRAS)-based algorithm for simultaneous stator resistance (R s) and rotor speed (w) identification of position sensorless induction motor to accurately estimate w at low speeds without affecting drive performance. The R s has to be estimated concurrently with the w estimation to compensate for the(More)
Since independent control of an AC machine requires only two currents, additional degrees of freedom that exist in multiphase (n>3) machines can be used for other purposes. One possibility is the series connection of the stator windings, in an appropriate manner, which enables independent control of a set of machines although a single multiphase(More)