Piotr Paplicki

Design optimization of a permanent-magnet excited synchronous machine for electrical automobiles

The paper deals with the automated optimal design of a new synchronous motor particularly suitable for electric vehicles. Identifying the shape of rotor pole and excitation magnets, minimizing the mass/volume and simultaneously maxi- mizing the torque, is the main design goal. The formulation of this problem in terms of a bi-objective optimal shape design problem possibly stimulates the identification of unexplored solutions of practical significance.

Low Cogging Torque Design of Permanent Magnet Machine Using Modified Multi-Level Set Method With Total Variation Regularization

This paper proposes a topology optimization method, which allows to design a permanent magnet (PM) excited machine with improved high-speed features, incorporating the topological gradient into the multi-level set method with total variation regularization. It involves the design of both the stator and the rotor, the shape of which has a predominant impact on the mechanical and electric features of a PM machine. The concept of the topological gradient is incorporated for the nucleation of new holes in the distribution of level sets. The essential advantage of the proposed method is its ability to handle topology change on a fixed mesh and its flexibility in terms of shape changing that leads to efficient computational schemes. Finally, 2/3-D models are developed and deeply analyzed to indicate that the applied method leads to a significant reduction of both the cogging torque and the amount of higher back EMF harmonics.

Topology optimization of rotor poles in a permanent-magnet machine using level set method and continuum design sensitivity analysis

– In this paper, a numerical approach to the topology optimization is proposed to design the permanent magnet excited machines with improved high-speed features. For this purpose the modified multi-level set method (MLSM) was proposed and applied to capture the shape of rotor poles on the fixed mesh using FE analysis. The paper aims to discuss these issues. , – This framework is based on theories of topological and shape derivative for the magnetostatic system. During the iterative optimization process, the shape of rotor poles and its evolution is represented by the level sets of a continuous level set function f. The shape optimization of the iron and the magnet rotor poles is provided by the combining continuum design sensitivity analysis with level set method. , – To obtain an innovative design of the rotor poles composed of different materials, the modified MLSM is proposed. An essential advantage of the proposed method is its ability to handle a topology change on a fixed mesh by the nucleating a small hole in design domain that leads to more efficient computational scheme then standard level set method. , – The proposed numerical approach to the topology design of the 3D model of a PM machine is based on the simplified 2D model under assumption that the eddy currents in both the magnet and iron parts are neglected. , – The novel aspect of the proposed method is the incorporation of the Total Variation regularization in the MLSM, which distribution is additionally modified by the gradient derivative information, in order to stabilize the optimization process and penalize oscillations without smoothing edges.

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.

Simplified reluctance equivalent circuit for hybrid excited ECPMS-machine modelling

The paper presents a simplified reluctance equivalent circuit for a hybrid excited ECPMS-machine. This circuit allows determining an air-gap flux control and can be used to estimate the influence of a rotor central core flux barrier on the machine field-weakening capability. The presented equivalent circuit has been based largely on results obtained by predictions using 3D-FEA.

Improved Control System of PM Machine with Extended Field Control Capability for EV Drive

The paper presents novel concept of prototyping, analysis and optimization of an Electric Controlled Permanent Magnet Excited Synchronous Machine (ECPMSM) drive with a field weakening capability for electric vehicle (EV). Operation modes, features, characteristics, FEA and analytical results, improved control system of the machine, and schematic diagram of EV central drive system with ECPMSM machine were also presented.

U-shape flux barriers and axial flux magnetic bridges in rotor of hybrid excited machine

The paper presents a novel rotor design with U-shape flux barriers concept for a hybrid excited synchronous machine with flux magnetic bridges. Based on 3D finite element analysis the influence of axial flux bridges on the field-weakening characteristics of the machine is estimated and compared with experimental results. Moreover, harmonics spectrum of the air-gap flux density, no-load magnetic flux linkage and back electromotive force for three rotor designs are reported in comparison. Additionally, the field-control characteristics versus DC control coil current of the machine are shown.

Research of IPM electrical machine with flux barriers

The paper presents an electrical machine prototype with embedded permanent magnets and magnetic barriers for electric motorcycle drive. The selected experimental results in comparison with simulation results carried out by using Ansys Maxwell have also been presented. Individual stages of design and construction of the proposed machine have been reported. The aim of the work was to build and test the electrical machine with permanent magnet dedicated to the electric vehicle drive. The machine should have a high ratio of inductances in the q-axis to the d-axis, low values of cogging torque and low torque ripple. On the basis of simulation study, carried out for different topologies, the selection of rotor structure with the favorite magnetic parameters has been done. The prototype machine was built based on the stator and housing of commercial 6.3 kW induction motor.