Michal Bonislawski

Design of Hybrid Excited Synchronous Machine for Electrical Vehicles

This paper deals with the optimal design of a new synchronous motor particularly suitable for electric vehicles. The unique advantage of this motor is its possibility to realize field weakening at high speeds, which is the most important demand for such drives. The main design goal is to identify the dimensions of certain crucial regions of the machine in order to avoid saturation of the iron and to minimize the mass to volume ratio, while simultaneously maximizing the torque. The originality of the contribution is manifold: formulating the design problem in multiobjective terms, solving it by means of evolutionary computing, solving the associated direct problem based on a three-dimensional finite element analysis (3-D-FEA) field model, considering a reduced set of design variables by means of response surface method, referring to a real-life problem.

Hybrid excited synchronous machine with flux control possibility

The paper presents simulation and experimental results of an Electric Controlled Permanent Magnet Synchronous (ECPMS) machine that offers an extended magnetic field control capability which makes it suitable for battery electric vehicle drives. Rotor, stator and additional direct current supplied coil of the machine have been analyzed in detail. Control and power supply systems of the machine have been presented. Influence of the additional excitation on the machine performance has also been discussed.

Unconventional control system of hybrid excited synchronous machine

The paper presents an unconventional approach to control Electric Controlled Permanent Magnet Synchronous Machine (ECPMSM) with universal method to determine its required parameters. Moreover, two different kinds of supply the additional control coil of the prototype machine have been analyzed in details. In the first variant, the control coil is placed within the stator part of the machine, thus the whole power supply system can be simplified. In the second variant, the additional control coil is placed on the rotor of the machine. This design solution allows to reduce control coils losses but it causes additional complications in the way of energy distribution.

Efficiency optimal control system of hybrid excited machines

The paper introduces an “a-priori” look-up-table procedure for an efficiency-optimal inverter-machine control system. This method has been applied for a hybrid excited permanent magnet synchronous machine. An exemplary machine model is proposed and a prototype is introduced with stator-located excitation coil. An iterative process for optimal current distribution is described, including multidimensional tables of overall losses and efficiencies. Based on appropriate calculations, an optimization algorithm can be implemented for various target functions, including classic permanent magnet synchronous machines. The proposed approach has been validated using experimental data. Experimental test-bench construction is presented, along with basic discussions on the methodology. Modeling and measurement results are presented, along with corresponding conclusions. A decrease of up to 6% of overall system losses was measured, mostly in the high speed range of the machine.

Averaged inverter loss estimation algorithm

Proposed paper presents a fast algorithm for determining static and switching losses of power electronic devices in three-phase DC/AC inverters for different semiconductor materials. This method uses table - form, stored characteristics of individual semiconductor devices, without a necessity of detailed, time resolved analysis of the commutation process. Using such algorithm accelerates total loss calculation, as a result electric machine control strategy can be developed allowing the improvement of the efficiency of the entire propulsion system.

Teaching modern power electronics-Computerized test stand design

A unified, computer controlled, modern system design for power electronics experimental laboratory is presented. Proposed test stand configuration simplifies the introductory part of the lab and maximizes the time that the students can use for experimental measurements and calculations. Hardware test stands (not only simulations) have a common pre‐configuration for all exercises so that students do not need to learn the system design and measurement configuration of every particular test stand. Clear measurement setup and momentary and average electrical parameter readings are done using a computer user interface. Hardware and software protection loops are foreseen so the number of errors of the hardware during testing is minimized, simple arrangement minimizes errors during test preparation.

Machine and inverter loss minimization of hybrid excited permanent magnet synchronous machines for electric vehicles

This paper discussed a control system for an HPMSM machine with a stator based field coil aiming at maximum efficiency of the inverter-machine system. A new procedure for efficiency-optimal inverter-machine propulsion system has been introduced. An iterative process for optimal current distribution is described with multidimensional tables of overall losses and efficiencies. Due to high-speed calculations, optimization algorithm can be implemented for various goal functions including classic PMSM drivetrains.

Impact of rotor design on flux control capability of hybrid excited synchronous machine

The paper presents the optimization and comparison of different rotor design concepts of an Electrically Controlled Permanent Magnet Excited Synchronous Machine (ECPMSM) possessing a field control capability. The experimental results of a no-load back electromotive force (back-EMF) waveforms, cogging torque and electromagnetic torque values are presented in detail. Moreover, in order to compare the over-speed capability of the machine in the varying rotor designs, the predicted performances, i.e. range of speed and resulting torque of the machines, have been estimated.

Loss calculation method for hybrid excited machines

This paper presents an experimental method for determining the main losses components in permanent magnets synchronous machines with hybrid excitation (HPMSM). To model the sources of losses is very important in order to optimize such machines and to develop robust control strategies (minimum losses optimization) which can be used in practical applications. Proposed approach was validated using time domain simulations and experiments. Experimental results clearly exhibit the benefits of including core loss model in control system of HPMSM. Streszczenie. W artykule przedstawiono eksperymentalną metodę wyznaczania głównych składników strat maszyn synchronicznych z magnesami trwałymi i wzbudzeniu hybrydowym (HPMSM). Zamodelowanie źródeł strat jest istotne dla optymalizacji tych maszyn oraz dla opracowania właściwych strategii ich sterowania (przy minimalizacja strat), które mogłyby być zastosowane w praktyce. Zaproponowany algorytm został sprawdzony teoretycznie i doświadczalnie. Wyniki badań eksperymentalnych pokazały zalety uwzględnienia strat mocy w algorytmie sterowania HPMSM. (Metoda wyznaczania strat maszyn wzbudzanych hybrydowo).