Abstract --This paper examines synchronous machines, whose excitation axis and reluctance axis can have an arbitrary angle. Basic equations for this machine type are set up and control strategies for maximum torque are derived. By using a normalized representation, it will be shown that machines with displacement angles of about 60° need up to 10% less permanent magnet material than conventional machines while yielding comparable motor performance.
Abstract-The identification and characterization of magnetic losses in electrical steel is the basis for the improvement of current drive technologies and quality assurance in the manufacturing processes. The enormous demands on drives regarding high frequencies, non-sinusoidal waveforms and polarizations in the area of the saturation flux density yield increased requirements for suitable testing devices. Thus, it is necessary to develop a new measuring system that combines the requirements of series production and measurement precision. As a second step it is possible to establish a measurement strategy that differ and separate the influence on the magnetic losses of every single production step inside the manufacturing process. For this application a fast, flexible and high performant modular measuring device is built up and is described in this paper.
Abstract-This paper presents a holistic approach to determine the effect of online reconfiguration of the motor winding of a synchronous permanent magnet motor resulting in switching the number of turns. The analysis is based on a parameter plane, which predicts the behavior of synchronous machine designs by using only two normalized parameters, the permanent magnet flux linkage and the ratio of the quadrature axis inductance Lq to the direct axis inductance L d . This enables a fast and reliable evaluation of all alternate winding configurations under given constraints. By generating a Pareto front, superior switching configurations can be identified. An exemplary configurable winding machine -implemented in a finite element analysis (FEA) -shows a significant improvement with respect to maximum torque (increase by 20.3%) and usable torque-speed operating range (increase by 5.5%) compared to the best fixed-winding configuration. The contribution demonstrates that this approach is not only applicable for permanent magnet synchronous motors but also for synchronous reluctance, electrically excited synchronous and induction motors.
Abstract-Synchronous machines with displaced reluctance axis promise improved performance due to the optimized utilization of reluctance and synchronous torque. Their torque characteristics make these machines interesting for applications which mostly require just one operation mode, i.e. motoring or generating, such as traction drives for electric vehicles. First of all, this paper shows that arbitrarily displaced reluctance axes are difficult to realize with pure permanent magnet and pure electrically excited synchronous machines and yield disadvantageous machine properties. In the second part, a hybrid synchronous machine topology which incorporates a displaced reluctance axis is introduced and its conceptual advantages compared to conventional machine designs are shown.
This paper presents a novel hybrid permanent magnet and wound field synchronous machine geometry with a displaced reluctance axis. This concept is known for improving motor operation performance and efficiency at the cost of an inferior generator operation. To overcome this disadvantage, the proposed machine geometry is capable of inverting the magnetic asymmetry dynamically. Thereby, the positive effects of the magnetic asymmetry can be used in any operation point. This paper examines the theoretical background and shows the benefits of this geometry by means of simulation and measurement. The prototype achieves an increase in torque of 4 % and an increase in efficiency of 2 percentage points over a conventional electrically excited synchronous machine.
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