Modular Power Sharing Control for Bearingless Multithree Phase Permanent Magnet Synchronous Machine

Abstract

This paper proposes a modular approach to the power sharing control of permanent magnet synchronous bearingless machine. The selected machine topology features a winding layout with phases distributed into non-overlapping three phase groups, a solution whose twofold aim is to increase the fault tolerance and to allow for the radial force generation. The three phase sub-windings are supplied by standard three-phase inverter, leading to a modular system architecture. A throughout explanation of the methodology used to develop the control algorithm is presented considering the torque and force control in combination with the power sharing management of the machine. Special emphasis is also placed on validating the modelling hypotheses based on a finite element characterisation of the machine electro-mechanical behaviour. The proposed control strategy is also extended to cater the possibility of one or more inverters failure, thus validating the intrinsic advantage of the redundancy obtained by the modularity of the system. An extensive experimental test campaign is finally carried out on a prototyped multi-three phase permanent magnet synchronous drive. The obtained results validate the bearingless power sharing operation in healthy and faulty scenarios, both at steady state and under extreme transient condition.

Analysis of DC-Link Low-Frequency Current Harmonics in Multi-Source Multi-Three-Phase Electric Drives

“…Various multi-three-phase structures can be achieved. In the case of permanent magnet synchronous motor (PMSM) drives, as illustrated in Figure 1, three main winding structures can be identified: multi-sector winding [1,2], multi-three-phase winding [3][4][5], and highly coupled winding [6][7][8][9]. One problem of using multi-three-phase drives is the DC-link design.…”

Dynamic multi‐agent dc‐bus reconfiguration in modular motor drives with a stacked polyphase bridge converter

“…They recently gained interest due to their advantageous economies of scales effect, their flexibility, reliability and additional degrees of freedom [1][2][3]. MMDs that are composed of a multiple of three motor and PE modules-the so-called multi-three-phase machines [4,5]-are of particular interest, since they can be considered as a group of three-phase winding sets, fed by standard three-phase two-level voltage source inverters (2L-VSIs). From the control point of view, these multithree-phase machines can make use of the well-consolidated three-phase control strategies, extending the modularity of the hardware to the control as well [6,7].…”