Tags:Bearingless PM motor, DPNV, FEM and Reduced order model
Abstract:
The finite element analysis (FEM) is a powerful tool applicable to many types of physics. Nowadays is widely used for research and even in industry for designing electrical machines as motors and generators with a high fidelity between model and manufactured machine. In this way, for industrial applications, FEM is considered a shortcut to development. In this context, electrical motors are always looking for high efficiency by increasing the rotational frequency, reducing the active material, increasing the power density, and reducing the footprint. However, evolution also sets constraints for the design, such as for high-speed motors, the bearings, and the resistance of materials. In the case of bearings, could be applied magnetics bearing for industrial applications. In the future is expected the use of a bearingless motor (BM) is to reduce the number of components of the motor and also the total length of the rotor that implies the first critical speed. The concept of BM has been developing over time, mainly in the research area with no large application in industry. This could be explained by the fact that there are three main fields of research in BM: electrical design, control, and power electronics. In this way, it is necessary for a multi-disciplinary team to implement solutions. This paper brings an innovation introducing a FEM-based reduced order model (ROM) for a BM. Until now, no proposal for integration of the three fields has been made in only one model. Usually, the motor is developed in FEM and introduced as an analytic control that does not consider the spatial harmonics and the harmonic saturation between the currents of stator and levitation. The current ROM stator was designed with dual purpose no voltage winding (DPNV) to optimize the size of the frequency inverter on a permanent magnetic motor, therefore, presents the second innovation. Besides there are polyphase ROM, this is the first that uses two independent windings.