This thesis proposes a new concept of an integrated and distributed inverter for switched reluctance machines. Due to the integration of machine and inverter, the number of terminal connections is independent of the number of phases, providing only dc-link power, communication and cooling. This simplifies the integration of the drive in the vehicle and therefore reduces complexity and costs of the drive system. To further simplify integration of machine and inverter, the concept of the distributed inverter involves the use of one separate inverter module for each coil. Thereby, also the heat losses of the power devices are distributed equally among the circumference of the machine, enhancing the cooling capability of the drive. With the modular inverter design each coil is electrically decoupled from the other coils of the machine. This increases the redundancy of the machine significantly, because the remaining inverter modules can continue operation in case of a fault. The capability of a drive to continue operation after an open- or short-circuit fault of an inverter module or a coil is of great interest, particularly in the area of military, aerospace, automotive and railway transportation industries. In these applications it is tolerable that the machine continues operation with reduced power after a fault. This so-called limp-home capability avoids all the inconveniences of a standstill. To guarantee safe operation in one particular machine, this thesis analyzes the influences of faults of single modules on torque ripple, net radial force and vibration and noise of the machine. The results are used to develop suitable control strategies to enable admissible operation in case of faults.
Switched reluctance direct drive with integrated distributed inverter
Aachener Beiträge des ISEA (ABISEA) ; 60 ; 1-141
2011
141 Seiten, Bilder, Tabellen, 74 Quellen
Theses
English