Sebastian Rick

Application of Sinusoidal Field Pole in a Permanent-Magnet Synchronous Machine to Improve the NVH Behavior Considering the MTPA and MTPV Operation Area

In this paper, various approaches to improve the noise, vibration, and harshness (NVH) behavior of a single-layer interior permanent-magnet synchronous machine (IPMSM) are evaluated. The studied machine is used in electric vehicles and has a maximum output power of 53.6 kW. The acoustic noise of the electrical machine is mainly generated due to vibration of the stator yoke, which is caused by the radial forces acting on the stators teeth. The radial force is directly correlated with the flux density in the air gap. Through modification of the outer frame of the rotor, the composition of the air-gap field, which consists of the fundamental wave and its harmonics, can be modified. The distribution of the radial force density on the surface of the stator teeth will be affected and the dominant order of the radial force can be reduced selectively, which will improve its acoustic behavior.

Permanent magnet synchronous reluctance machine - bridge design for two-layer applications

The permanent magnet synchronous reluctance machine (PMSynRM) is a combination of the characteristics of two machine types: High efficiency, high power density of the permanent magnet synchronous machine (PMSM) as well as better high-speed performance and lower costs of the synchronous reluctance machine (SynRM). This paper presents a general approach for the electro-magnetic design of a PMSynRM. Essential design rules for constructing a PMSynRM are shown. In particular the rotor configuration is improved by dimensioning of the bridges between flux barriers and air gap. An interior permanent magnet synchronous machine (IPMSM) with two layers which form the flux barriers in the rotor is used as reference. The results are concluded in an objective function.

Hybrid acoustic model of electric vehicles: Force excitation in permanent magnet synchronous machines

In this work an integrated model for acoustic evaluation of electric vehicles is introduced. The paper focuses on the force excitation part of the model. The analysis is performed for permanent magnet synchronous machines. The excitation forces are placed on the stator teeth and calculated for a structure dynamic model of the power train. A model for the acoustic emission is adapted and finally the psychoacoustical behavior is characterized at the position of the driver of the e-car. An approach for the design of the rotor pole topology is introduced to ensure a beneficial acoustic behavior under consideration of air gap flux density and related force densities on the stator teeth. The calculation is performed using FEA simulation, but also analytical design methods are considered. Objective of this comparison is a very short computation time and therefore an efficient simulation process. The model is validated by measurements on test benches.

Permanent magnet synchronous reluctance machine — Design guidelines to improve the acoustic behavior

The permanent magnet synchronous reluctance machine (PMSynRM) is a type of permanent magnet synchronous machine (PMSM) with the objective to provide high reluctance torque. This is realized by a particularly designed constellation of flux barriers in the rotor of the machine. Beside high efficiency and supplied power density, an acoustic evaluation of this machine is performed for various applications, for example in hybrid and electric vehicles (HEV, EV). A study for the acoustic design of a PMSynRM is presented in this paper. An approach to improve the magnetic circuit by varying the shape of the flux barriers is introduced. Using numerical simulations every operating point in the d-q-diagram is considered. The local force density in the air gap of the machine is calculated and analyzed with a 2-D Fourier Transformation. The results are used as analysis criterion.

Application of sinusoidal field pole in a permanent magnet synchronous machine to improve the acoustic behavior considering the MTPA and MTPV operation area

In this paper, various approaches to improve the acoustic behavior of a single layer interior permanent magnet synchronous machine (IPMSM) are evaluated. The studied machine is designed for the application in electric vehicles and has a maximum output power of 53.6 kW. The acoustic noise of the electrical machine is mainly generated due to vibration of the stator yoke, which is caused by the radial forces acting on the stators teeth. The radial force is directly correlated with the flux density in the air gap. Through modification of the outer frame of the rotor, the composition of the air gap field, which consists of the fundamental wave and its harmonics, can be modified. The distribution of the radial force density on the surface of the stator teeth will be affected and the dominant order of the radial force can be reduced selectively, which will improve its acoustic behavior.

Coupling of electromagnetic and structural dynamics for a wind turbine generator

This contribution presents a model interface of a wind turbine generator to represent the reciprocal effects between the mechanical and the electromagnetic system. Therefore, a multi-body-simulation (MBS) model in Simpack is set up and coupled with a quasi-static electromagnetic (EM) model of the generator in Matlab/Simulink via co-simulation. Due to lack of data regarding the structural properties of the generator the modal properties of the MBS model are fitted with respect to results of an experimental modal analysis (EMA) on the reference generator. The used method and the results of this approach are presented in this paper. The MB S model and the interface are set up in such a way that the EM forces can be applied to the structure and the response of the structure can be fed back to the EM model. The results of this cosimulation clearly show an influence of the feedback of the mechanical response which is mainly damping in the torsional degree of freedom and effects due to eccentricity in radial direction. The accuracy of these results will be validated via test bench measurements and presented in future work. Furthermore it is suggested that the EM model should be adjusted in future works so that transient effects are represented.

Hybrid Acoustic Model of Electric Vehicles: Force Excitation in Permanent-Magnet Synchronous Machines

In this paper, an integrated model for acoustic evaluation of electric vehicles is introduced. The paper focuses on the force excitation part of the model. The analysis is performed for permanent magnet synchronous machines. The excitation forces are placed on the stator teeth and calculated for a structure dynamic model of the power train. A model for the acoustic emission is adapted, and finally, the psychoacoustical behavior is characterized at the position of the driver of the e-car. An approach for the design of the rotor pole topology is introduced to ensure a beneficial acoustic behavior under consideration of air gap flux density and related force densities on the stator teeth. The calculation is performed using finite-element analysis simulation, but also analytical design methods are considered. Objective of this comparison is a very short computation time and, therefore, an efficient simulation process. The model is validated by measurements on test benches.