M. Hadziselimovic

Line-Starting Three- and Single-Phase Interior Permanent Magnet Synchronous Motors—Direct Comparison to Induction Motors

The performance comparison of three- and single-phase line-start interior permanent magnet synchronous motors (LSIPMSMs) and induction motors (IMs) with equal squirrel-cage design and symmetric four-pole stator windings is presented. The finite element method was employed in analysis of steady-state synchronous performance of LSIPMSMs. A magnetically linear lumped parameter model was employed in analysis of line-starting performance of LSIPMSMs, where the electrical and also the mechanical subsystems were considered. The procedure which was used for the LSIPMSM design was validated by comparison of calculation and measurement results. The performance of three- and single-phase LSIPMSMs and IMs with equal squirrel-cage design was directly compared and evaluated, thus emphasizing impacts of the permanent magnet breaking torque and reluctance breaking torque on the LSIPMSM performance in the asynchronous operation region.

Torque Analysis of an Axial Flux Permanent Magnet Synchronous Machine by Using Analytical Magnetic Field Calculation

This paper presents a torque analysis of an axial flux permanent magnet synchronous machine (AFPMSM) based on analytical analysis of magnetic field. The proposed method for torque analysis requires less computational time and is more flexible than finite element method (FEM). This is important advantage, especially for the early stages of the design process. Torque measurements on prototype AFPMSM confirm the validity of the torque analysis method.

Analytical Analysis of Magnetic Field and Back Electromotive Force Calculation of an Axial-Flux Permanent Magnet Synchronous Generator With Coreless Stator

This paper presents the analytical analysis of magnetic field and back electromotive force (back EMF) calculation in an axial flux permanent magnet synchronous generator (AFPMSG) without stator core. For the verification, the numerical analysis [finite element method (FEM)] of magnetic field is accomplished and comparison between analytical and numerical solution of magnetic field is presented. Both analytical and numerical solutions are obtained via magnetic vector potential, respectively. This paper also presents the comparison between analytical solution and numerical (FEM) solution of back EMF using Faradays law. The verifications show that good agreement between analytical and numerical solution of magnetic field and back EMF is obtained. The validity of the proposed analytical method is additionally confirmed with measurements of back EMF on prototype AFPMSG with coreless stator.

Design and Finite-Element Analysis of Interior Permanent Magnet Synchronous Motor With Flux Barriers

The paper presents a finite-element method-based design and analysis of interior permanent magnet synchronous motor with flux barriers (IPMSMFB). Various parameters of IPMSMFB rotor structure were taken into account at determination of a suitable rotor construction. On the basis of FEM analysis the rotor of IPMSMFB with three-flux barriers was built. Output torque capability and flux weakening performance of IPMSMFB were compared with performances of conventional interior permanent magnet synchronous motor (IPMSM), having the same rotor geometrical dimensions and the same stator construction. The predicted performance of conventional IPMSM and IPMSMFB was confirmed with the measurements over a wide-speed range of constant output power operation.

Determining Parameters of a Line-Start Interior Permanent Magnet Synchronous Motor Model by the Differential Evolution

The line-starting performance and synchronization capability of a line-start interior permanent magnet synchronous motor (LSIPMSM) has to be evaluated by considering different loads and different values of supply voltages, which requires the usage of a reliable dynamic model. In this work the parameters of a magnetically linear lumped parameter LSIPMSM dynamic model were determined by the differential evolution (DE). The optimization objective was the best possible agreement between the measured and by the model calculated time-behavior of model variables. Parameters determined by the DE are used in the LSIPMSM dynamic model, improving agreement between measured and calculated responses of currents and motor speed.

Analysis of Induction Motor Drive Losses in the Field-Weakening Region

Operation of adjustable-frequency drives is accompanied by generation of losses in the converter and motor. These losses depend on the modulation frequency and on the drive output power. The change of modulation frequency modifies converter losses and also motor losses, because of the modified motor current waveform. Thus, it modifies total drive losses. Variation of the drive output power also modifies total drive losses and can be problematic when the drive operates in the field-weakening region. The paper presents a complete analysis of motor losses, converter losses and losses of the entire drive in the field-weakening region of an open loop controlled induction motor drive supplied by a voltage source inverter. Losses are presented in dependence of the voltage source inverter output frequency and the drives output power. Presented results show that the modified voltage to frequency ratio causes an increase of the total drive losses in the region of high frequencies and high output powers. The paper also presents an analysis of the impact of modulation frequency on drive losses

Evaluation of line-start interior permanent magnet synchronous motor model parameters using finite elements

The paper deals with the evaluation of line-start interior permanent magnet synchronous motor (LSIPMSM) model parameters using finite elements. A lumped parameter dynamic model with current-dependant variable parameters is used in LSIPMSM dynamic performance evaluation. By a dynamic model determined run-up responses under different supply and load conditions were confirmed experimentally in the case of four pole 1.1 kW LSIPMSM.

Modeling of a serial hybrid powertrain for busses in the city of Osijek, Croatia

Model development of a serial hybrid powertrain for the city bus to be used in urban transport in Slavonia Plain is presented. Data analysis of the driving speed, fuel consumption and engine speed using energy flow method in driving cycles of observed buses provided basic design parameters to the powertrain concept of serial hybrid drive. Solution concept of the diesel engine power reduction due to the optimum operation and kinetic energy recovery system ensures the projects sustainability and the return of investment in a relatively short period of time. Serial hybrid powertrain concepts in buses through energy efficiency ensure benefit in fuel economy, reduced noise and CO2 emissions versus larger total investment costs.