The previously developed predictive control has been adapted for application in permanent magnet synchronous motor. Depending on the desired performance, two variants are proposed, yielding either lower switching frequency or lower current ripple. Simulations and measurements on a laboratory model with SM having low inductances (thus expecting high ripple) and very high number of poles (high stator supply frequency), confirm the validity of the approach. Additional considerations regarding practical problems, some of which can be found in similar predictive methods, are also presented.
COBISS.SI-ID: 7253844
Previously developed method for predictive control has been converted into a general form. Depending on the application, two different variants have been developed that offer a choice between low ripple of the output value and high switching frequency and vice versa. An additional effort has been invested in overcoming the problems due to different delays (processing time, acquisition time, transistor triggering delay) thus obtaining an optimal operation. The general idea has been demonstrated on laboratory models of active power filter, synchronous and asynchronous drive.
COBISS.SI-ID: 7112020
The paper deals with dependency of variations in the rotor design on the synchronous, asynchronous and on-line starting characteristics of a three phase synchronous-reluctance motor (SRM). Its starting characteristics, such as stator phase currents, electromagnetic torque and speed variations, are presented. The effect of different rotor designs, amounts of aluminum in a rotor cage and use of different materials on the on-line starting characteristics is determined. To increase the SRM synchronous torque capability, a control algorithm is proposed.
COBISS.SI-ID: 7629908
The study presents how cogging torque in synchronous motors (SM) is sensitive to the number of applied interlocks in back-iron, which is a standard method for stator lamination stacking. SM exhibit inherent cogging torque, which creates torque ripple and prevents smooth rotation of the rotor resulting in undesirable vibration and noise. A procedure that would predict and evaluate cogging torque components relative to applied number and positions of interlocks is proposed.
COBISS.SI-ID: 6957908
The study presents issues for reducing cogging torque of synchronous motors (SM). When proper methods are employed, it is theoretically possible to minimize its level or even to eliminate it. FFT analyses of cogging torque in mass–produced motors have shown additional harmonic components, which are in tight correlation with assembly tolerances and/or permanent–magnet imperfections. Finite element method has been used to study the sensitivity of different motor models relative to manufacturing tolerances and to determine rules for detecting imperfections in mass–production.
COBISS.SI-ID: 6958164