Query: Thomas finken

title: Comparison and design of different electrical machine types regarding their applicability in hybrid electrical vehicles
abstract: Because of high requirements in power, efficiency, installation space and weight, the design of electrical machines for hybrid electrical vehicles is a particular challenge. In order to make an informed decision, several machine types are pre dimensioned by means of analytical formulae and compared with respect to their power density, efficiency and their applicability in hybrid vehicle concepts. The analytical pre designs are evaluated by the finite element method (FEM) With regard to a parallel hybrid system with a very restricted installation space, a further study is performed on the permanent magnet excited synchronous machine, preferred for its highest power density and overall efficiency.

title: Study and comparison of several permanent magnet excited rotor types regarding their applicability in electric vehicles
abstract: Due to the limited available space and the high demands in power density and overall efficiency, the permanent magnet synchronous machine (PMSM) is the mainly applied machine type in parallel hybrid electric vehicles (HEV) This machine is used as well in many full electric vehicles (EV) In this work, several permanent magnet excited rotor types are studied regarding their applicability in EVs and HEVs, and are compared in terms of among others: their maximum torque and power, power density, their efficiency map, field weakening capability, overload capacity and torque ripple.

title: Design and optimization of an IPMSM with fixed outer dimensions for application in HEVs
abstract: Permanent magnet excited synchronous machines (PMSM) are finding more and more applications nowadays. They are particularly well adapted when a high power to volume ratio or a high overall efficiency are required. This is in particular the case for hybrid electric vehicles (HEV) due to the limited space available in drive trains and the severe constraints on fuel consumption. PM motors are therefore the most widespread machine type in parallel HEVs. This paper presents the design and optimization of an internal PM motor (IPMSM) under the constraint that the outer dimensions of the machine are fixed. The optimal rotor radius and the appropriate pole pair number of the machine are determined by means of analytical calculations and finite element (FE) simulations. A geometry optimization is performed, considering all losses (i.e. copper iron and eddy current losses) as well as the demagnetization resistance and the effect of centrifugal forces at high rotational speeds. In order to determine the field weakening capability and to generate the speed torque as well as the speed power characteristics, the direct and quadrature axis inductances are calculated in function of the load current and the field weakening angle.

title: Study of Hybrid Excited Synchronous Alternators for Automotive Applications Using Coupled FE and Circuit Simulations
abstract: In this paper, an alternative arrangement to conventional Lundell automotive generators is examined. This geometry is characterized by hybrid excitation combining the high energy density of permanent magnets and the controllability of commonly used electrical excitation. The rotor geometry of the alternator is optimized by means of finite element (FE) simulations and a prototype design is developed. The formulation for the transient solver is given and the coupling of the FE model with an external circuit is explained in detail. The accomplished studies, simulations, and geometry optimizations are presented. In a final step, the simulations are compared to prototype measurements and confronted with conventional alternator geometries.

title: Automated Virtual Prototyping of Permanent Magnet Synchronous Machines for HEVs
abstract: Ecological awareness has spurred a renewed interest in hybrid electrical vehicles (HEV) because of their ability to combine the drive power of a combustion engine with that of electrical machines. PMSM's notoriously offer large torque/weight ratios and are therefore particularly well suited for inclusion in HEV drivetrains, where the available space is in general strictly limited. The virtual prototyping and optimizing of PMSM for HEV drive trains is, however, a repetitive and computer intensive task. This paper presents a automated methodology aiming at reducing to a minimum the design time by means of a systematic approach and parallel computing.

title: Fahrzyklusgerechte Auslegung von permanentmagneterregten Synchronmaschinen fur Hybrid und Elektrofahrzeuge

title: Computation of Iron and Eddy Current Losses in IPM Motors depending on the Field Weakening Angle and Current Waveform

title: EDITORIAL DYNA 171. Febrero 2012

title: Study and geometry optimization of hybrid excited synchronous alternators for automotive applications
abstract: Due to the increasing demand for power a continuous development of automotive alternators concerning power, efficiency and power density is required. In this paper an alternative arrangement to conventional Lundell automotive generators is examined. This geometry is characterized by its hybrid excitation combining the high energy density of permanent magnets and the controllability of commonly used electrical excitation thus a simple and cost effective control of output voltage for application in on board supply systems is possible. A simulation of the alternator using the finite element method (FEM) is performed to optimize the rotor geometry and to develop a design, ready for prototyping. The finite element calculation of the alternator behavior and the unknown stator current, including their reaction on the entire magnetic field, requires a transient solving process taking the geometry rotation into account and which is coupled to an electric circuit. The formulation for the transient solver is given and the coupling with external circuit exemplified. The accomplished studies, simulations and geometry optimizations are presented. In a final step the calculations are compared to prototype measurements and confronted with conventional alternator geometries. The developed geometry absorbed about five percent more power but was fifteen percent lighter than compared Lundell generator.

title: Automated virtual prototyping of permanent magnet synchronous machines for HEV's
abstract: Hybrid electrical vehicles (HEV) which combine the drive power of an internal combustion engine and that of one or several electrical machines (EM) are finding, due to an increasing ecological awareness, a better market acceptance nowadays. Due to the limited space available in drive trains, PM motors, which offer high power densities, are prime candidates for such applications. This paper presents an automated design process for PMSM, which reduces the motor development time and allows considering many design variations.