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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)
—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)
—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)
Five inverter power circuits suitable for switched reluctance motor (SRM) drives are analyzed. The peak voltage and current ratings of the power switches and the size and peak ratings of the DC link components of each circuit are compared. As an example, a converter analysis and selection are performed for a high-speed, 6/2 SRM, suitable for a spindle(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 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)