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Unbalanced Magnetic Forces in Rotational Unsymmetrical Transverse Flux Machine
Baserrah, Salwa,Rixen, Keno,Orlik, Bernd The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.2
The torque and unbalanced magnetic forces in permanent magnet machines are resultants of the tangential, axial and normal magnetic forces, respectively. Those are in general influenced by pole-teeth-winding configuration. A study of the torque and unbalanced magnetic forces of a small flux concentrating permanent magnet transverse flux machine (FCPM-TFM) in segmented compact structure is presented in this paper. By using FLUX3D software from Cedrat, Maxwell stress tensor has been solved. Finite element (FE-) magneto static study followed by transient analysis has been conducted to investigate the influence of unsymmetrical winding pattern, in respect to the rotor, on the performance of the FCPM-TFM. Calculating the magnetic field components in the air gap has required an introduction of a 2D grid in the middle of the air gap, whereby good estimations of the forces are obtained. In this machine, the axial magnetic forces reveal relatively higher amplitudes compared to the normal forces. Practical results of a prototype motor are demonstrated through the analysis.
Unbalanced Magnetic Forces in Rotational Unsymmetrical Transverse Flux Machine
Salwa Baserrah,Keno Rixen,Bernd Orlik 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.2
The torque and unbalanced magnetic forces in permanent magnet machines are resultants of the tangential, axial and normal magnetic forces, respectively. Those are in general influenced by pole-teeth-winding configuration. A study of the torque and unbalanced magnetic forces of a small flux concentrating permanent magnet transverse flux machine (FCPM-TFM) in segmented compact structure is presented in this paper. By using FLUX3D software from Cedrat, Maxwell stress tensor has been solved. Finite element (FE-) magneto static study followed by transient analysis has been conducted to investigate the influence of unsymmetrical winding pattern, in respect to the rotor, on the performance of the FCPM-TFM. Calculating the magnetic field components in the air gap has required an introduction of a 2D grid in the middle of the air gap, whereby good estimations of the forces are obtained. In this machine, the axial magnetic forces reveal relatively higher amplitudes compared to the normal forces. Practical results of a prototype motor are demonstrated through the analysis.
Salwa Baserrah,Keno Rixen,Bernd Orlik 한국자기학회 2012 Journal of Magnetics Vol.17 No.2
Flux concentrated permanent magnet transverse flux machines, FCPM-TFMs, with segmented stators require multi-turn concentric saddle coils to replace the ring coils, which are normally utilized in conventional layeredphase TFM constructions. In this paper, we investigate the influence of the shape of saddle phase windings and their parameter variations on the output torque productivity. Non-meshed coils evaluated via a finite element method (FEM) to examine the effect of the coil’s location within one phase on machine performance. By using meshed coils, the analysis can be extended to inspect the distributions of magnetic field strength as well as current density in the coils. Throughout the study, the influence of design parameters on the output torque for two stator structures, i.e., a laminated and soft magnetic composite (SMC), are evaluated.
Tobias F. C. Berninger,Chenhong Huang,Marvin A. Ochsenius,Daniel J. Rixen 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
The structural dynamics of a robot manipulator can have a large influence on its overall dynamic behavior. They can cause unwanted resonances, limit the control bandwidth and lead to instability. For this reason, a significant amount of research has focused on the development of advanced control methods which consider the structural dynamics of a robot. These techniques are, however, still rarely employed in practice due to their complex nature and reliance on accurate models. A popular decentralized control scheme for robot joints is cascaded position, velocity and current control of the motor. The goal of this paper is to visualize the influence of the structural dynamics of a flexible beam and flexible harmonic drive gear on this type of joint controller. The derived effects are explained by mainly relying on simulated and measured transfer functions, without the use of the typical equations. The difference between closing the control loop with position feedback from the motor side or on the joint side after the flexible gear is also investigated. The results are first generated using a flexible multibody simulation and later verified on a robot joint test rig.