Integrated drive and reliabilities: fault tolerant architectures and supply

Abstract

One major challenge of e-aerospace motor is high densities (kW/kg, Nm/kg) keeping a high functional reliability. With high switching frequency Voltage Source Inverter (VSI) using Wide-Band Gap (WBG) components, the DC-bus capacitor mass can be reduced. On contrary, because of very short commutation time (<50ns), the requirements for the connexion between VSI and machine terminals are higher. For a better proficiency, the integration of VSI inside the machine is then desirable. Besides, with WBG components, the temperature limit of the VSI is becoming higher than 150°C and consequently close to those of machines, favouring a common cooling and so, mass reduction. Finally, in integrated drive, the major drawback of fault-tolerant multiphase machines due to numerous external cables is alleviated. In order to benefit of this evolution, new topologies of integrated drive can be imagined. The paper examines different candidates of multiphase machines for integration and proposes an original topology taking into account simultaneously different constraints and opportunities.