Guaranteeing the fault transient performance of aerospace multiphase permanent magnet motor system: An adaptive robust speed control approach

Abstract

To enhance the fault transient performance of aerospace multiphase permanent magnet synchronous motor (PMSM) system, an adaptive robust speed control is proposed regardless of the phase open-circuit (OC) and short-circuit (SC) fault in this paper, which can be applied for both the redundant motor system and fault tolerant motor system. For aerospace multiphase PMSM system, besides external load disturbance and system parameter perturbation, there inevitably exists the electromagnetic torque ripple in fault transient process, which can degrade the system performance and even cause the system instability. To cope with this issue, the electromagnet torque ripple of the multiphase PMSM system in fault transient process is first analyzed. Then, by considering the electromagnet torque fluctuation caused by fault transient as a system uncertainty, a novel adaptive robust speed control scheme is proposed, while the adaptive law is constructed to emulate the total system uncertainty bound, which include the load disturbance, the parameter variation, and the electromagnetic torque fluctuation due to fault transient. The resulting control can ensure the speed control performance even in fault transient process regardless of the uncertainty, in which no prior estimation of the uncertainty bound is required. In addition, the proposed adaptive robust speed control is demonstrated by a six-phase PMSM experimental platform. The novelty of this research is to explore a novel adaptive robust speed control to strengthen the fault tolerance performance of multiphase PMSM system even in fault transient process, which requires no prior estimation of the uncertainty bound. Index Terms-Multiphase permanent magnet motor, fault transient, fault tolerance, adaptive robust control. I. INTRODUCTIONITH the superiority of high fuel efficiency, good maintainability and low environmental noise, the more

A Comprehensive Survey on Fault Tolerance in Multiphase AC Drives, Part 1: General Overview Considering Multiple Fault Types

“…In PMSMs based on multiple (isolated) three-phase star-connected winding sets with a stator SC (of any type) in one or two phases, it can be an attractive option to impose SC, also, on the other phases of the same winding set (i.e., three top or three bottom switches on) [97,98,129,222,243,245,265]. On the one hand, the current induced in the shorted healthy phases tends to reduce the flux and current through the faulty turns/coils [129]; on the other hand, a balanced SC can be less harmful than an unbalanced one [230].…”

“…On the one hand, the current induced in the shorted healthy phases tends to reduce the flux and current through the faulty turns/coils [129]; on the other hand, a balanced SC can be less harmful than an unbalanced one [230]. For example, even though the brake torque is normally higher for a three-phase SC than for a singlephase SC, in most cases the torque ripple is much lower for the former, due to the greater degree of symmetry in the stator excitation [27,247,258,265].…”

“…This approach is possible in FB VSCs without any modifications. FB VSCs are, in fact, relatively common in drives tolerant to stator SCs: e.g., using multiple H-bridges (which also offer high electrical isolation between phases for dc-link faults or switch SCs) [89,93,95,96,99,130,162,164,165,[210][211][212]223,227,228,233,240,[264][265][266]271] or a single FB VSC [94,128,248,263,267].…”

“…Other methods for automatically adapting the current references under stator SCs/OCs without fault information are presented by Guo et al [272] and Xu et al [265]. The current references are provided by a speed controller based on robust control law, and the main goal is to ensure satisfying transient responses when the fault occurs, before it is detected.…”

A Dual-Redundancy Two-Phase Hybrid Stepping Motor for Satellite Antenna Drive System

“…Redundancy technology is a technology to increase fault tolerance by adding the same components or systems. The redundancy control method of a traditional drive system runs multiple motors in parallel, the disadvantages of which are complex structure and high cost [17].…”