Author : James Anthony Swanke
Release : 2023
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Fault-tolerant Integrated Modular Motor Drive for Applications with Demanding Reliability Requirements by : James Anthony Swanke
Download or read book Fault-tolerant Integrated Modular Motor Drive for Applications with Demanding Reliability Requirements written by James Anthony Swanke. This book was released on 2023. Available in PDF, EPUB and Kindle. Book excerpt: Permanent magnet synchronous machines (PMSMs) are commonly used in transportation applications due to their high efficiency and low mass. Additional benefits can be achieved by integrating power electronics into the machine to form an integrated motor drive (IMD). The PMSM IMD is a candidate for electric aircraft propulsion applications with elevated reliability requirements compared to typical terrestrial applications. IMD reliability can be improved with the incorporation of fault-tolerant (FT) features into the design. A technique for enhancing a motor drive's fault tolerance is to divide it into redundant three-phase channels, enabling continued operation after multiple faults. Maintaining electromagnetic and thermal isolation between three-phase channels is critical to avoid fault propagation. Combining this modularity with the basic IMD results in an integrated modular motor drive (IMMD). Machine power density, module isolation, performance, and reliability tradeoffs are investigated for IMMDs. A promising IMMD configuration with electromagnetic and thermal isolation characteristics has been proposed and evaluated for a four-module IMMD used in a quadrotor aircraft. To enhance the electromagnetic isolation, cavities are introduced into the stator yoke, and the stator tooth tips have been manipulated to minimize electromagnetic interactions between phases while minimizing the negative impact on the machine's power density. Additionally, direct cooling inside the stator slots and placement of insulation provides thermal isolation between phases. A reliability analysis is completed for the four-module IMMD configuration using Markov chain tools. This analysis addresses the major drive-system components, including healthy and faulted stresses. The importance of repairs and the single-point failure rate in determining the complete IMMD's failure rate are highlighted. The analysis is generalized to consider the IMMD's module count and the number of faulted modules. Figures of merit are established to compare FT topologies based on their improved reliability potential measured against their offsetting penalties. The developed isolation concepts are refined during the design and fabrication of a two-module PMSM. Machine parameters and performance were validated experimentally for healthy and faulted conditions. Test results confirm the effectiveness of the new electromagnetic and thermal isolation features, and the ability of the healthy module to continue delivering its pre-fault torque following a fault.