Abstract
Reliability is a fundamental requirement in electric propulsion systems, involving a particular approach in studies on system failure probabilities. An intrinsic improvement to the propulsion system involves introducing robust architectures such as fault-tolerant motor drives to these systems. Considering the potential for hardware failures, a fault-tolerant design approach will achieve reliability objectives without recourse to optimized redundancy or over-sizing the system. Provisions for planned degraded modes of operation are designed to operate the motor in fault-tolerant mode, which makes them different from the pure design redundancy approach. This article presents how a five-phase permanent-magnet synchronous motor operates under one- or two-phase faults, and how the system reconfigures post-fault motor currents to meet the torque and speed requirement of reliable operation that meets the requirements of an electric propulsion system.
Highlights
This paper has presented effective post-fault current control strategies to operate a fivebalanced and identical to each other; Figure 18b shows a phase difference of 90° with curphase permanent magnet synchronous motor indefinitely
A case study was performed to rents balanced as proposed earlier in this article for a one-phase fault mode, whereas in Figselect an optimum point between the achievable maximum average torque and minimum ure 18c,d it is clear that the current profiles have a phase difference of 120° and the motor ripples in accordance with the application
The results presented earlier show an appropriate current control strategy that enables this article
Summary
Marine, and railway applications, electric machines and their drive systems have recently gained significant commercial interest due to their potential for higher energy efficiencies, higher peak power, faster power response, and lower emissions as compared to conventional solutions [1,2] Characteristics such as high power and torque density, increased starting torque, great hill-climbing ability, reliability, robustness appropriate to the environment, low acoustic noise, low torque ripple, good voltage regulation over a wide speed range, and acceptable cost [1,3,4,5,6,7,8] are the main reasons for the growing trend towards automotive electrification. DC machines have been replaced by induction and permanent-magnet motors [12,17,18,19]
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