This paper presents the design of a Permanent Magnet synchronous machine for integration into hybrid propulsion system of a light aircraft.A performance analysis to satisfy the power deficit between propeller and Internal Combustion Engine was carried out. A machine with surface permanent magnets and concentrated windings has been designed. The goal was to define a motor focusing on the key points of performance and reliability. A carbon fiber sleeve has been inserted in rotor core in order to guarantee the holding of the magnets at high speed and ensure even higher reliability. Requirements are fully satisfied at rated and peak power and the motor encumbrance is within the imposed values. Moreover, a thermal analysis of the liquid cooled machine has been carried out in order to verify the temperatures during its operation.
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