TY - GEN
T1 - Converter temperature regulation with dual mode control of fault-tolerant permanent magnet motors
AU - Fernando, W. U.N.
AU - Papini, L.
AU - Gerada, C.
PY - 2012
Y1 - 2012
N2 - A control strategy for fault tolerant PM motors is developed and addresses the operation during a cooling failure in the power-electronic converter. A fault tolerant PM motor interfaced with a parallel H-bridge per-phase topology is considered. Conventional pulse-width modulation (PWM) based voltage generation is used under normal operation. However, the parallel H-bridge module per-phase topology benefits from the capability to generate quasi-square wave (QSW) voltages as an alternative to PWM voltages. The generation of a QSW voltage incurs lower switching losses compared with PWM based voltage generation and the former can be utilized as a safe operating mode for the converter. Typically, converters designed for aero-space applications are equipped with liquid cooling systems and may also require continuous duty operation under cooling system failure. This paper considers the possibility to alternate between these two switching methods for the regulation of converter temperature under contingency e.g., during reduced cooling conditions. Simulated operating point waveforms of current, voltage and torque during PWM and QSW modes are presented for a 18kW 20krpm machine. A reduction in losses in the range of 20%-50% is estimated via simulations. Thermal simulations present the temperature regulation capability with the dual mode controller.
AB - A control strategy for fault tolerant PM motors is developed and addresses the operation during a cooling failure in the power-electronic converter. A fault tolerant PM motor interfaced with a parallel H-bridge per-phase topology is considered. Conventional pulse-width modulation (PWM) based voltage generation is used under normal operation. However, the parallel H-bridge module per-phase topology benefits from the capability to generate quasi-square wave (QSW) voltages as an alternative to PWM voltages. The generation of a QSW voltage incurs lower switching losses compared with PWM based voltage generation and the former can be utilized as a safe operating mode for the converter. Typically, converters designed for aero-space applications are equipped with liquid cooling systems and may also require continuous duty operation under cooling system failure. This paper considers the possibility to alternate between these two switching methods for the regulation of converter temperature under contingency e.g., during reduced cooling conditions. Simulated operating point waveforms of current, voltage and torque during PWM and QSW modes are presented for a 18kW 20krpm machine. A reduction in losses in the range of 20%-50% is estimated via simulations. Thermal simulations present the temperature regulation capability with the dual mode controller.
UR - http://www.scopus.com/inward/record.url?scp=84870924760&partnerID=8YFLogxK
U2 - 10.1109/ECCE.2012.6342580
DO - 10.1109/ECCE.2012.6342580
M3 - Conference contribution
AN - SCOPUS:84870924760
SN - 9781467308014
T3 - 2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012
SP - 1902
EP - 1908
BT - 2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012
T2 - 4th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2012
Y2 - 15 September 2012 through 20 September 2012
ER -