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The radial and lévitation forces, necessary to suspend a double conical permanent magnet synchronous rotor, are generated by superposition of the rotor field and two stator fields with one pole pair difference. Due to the superposition of the fields in the air gap, some force interferences are disturbing the levitated drive. The origin of these perturbations are explained and described in a simplified...
The pole placement control with motion decoupling and integral action, according to the full modal synthesis, is addressed in this paper, to control a 1 kW, 18000 min−1 double conical Bearingless Permanent Magnet Synchronous Motor prototype. An electro-mechanical model of the prototype is derived analytically together with the design of the control scheme. The design of a pole placement scheme, with...
This paper focuses on conditions leading to instability of digitally controlled double three-phase permanent magnet synchronous motors with standard PI controller based voltage source inverters. A first simplified motor model is derived to apprehend the problem. The model is then detailed further to get accurate stability limits. A validation of the analysis is done experimentally on a double star...
A synthetic test bench with two different voltage sources is described to investigate bearing currents, based on a lumped element model of an electrical motor. The aim of this synthetic test bench is to reproduce the voltage and current wave form at the bearing, which actually happen in bearings of inverter-fed motors, to investigate the influence of these electric quantities on bearing failures.
A Bearingless high speed drive force generation is based on the superposition of two fields of different pole pairs differing by ± 1. This paper presents a comparison of electromagnetic properties between the conventional double distributed winding topology of bearingless motors with a non-conventional design, relevant for two pole bearingless drives. It will focus especially on the design equations,...
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