Electric steering for aircraft nose landing gears using axial-flux permanent-magnet motors

The paper deals with ball screw actuators used for the electric steering of nose landing gears in civil aircrafts. Design options and performance analyses are carried out with reference to actuators composed by ball screws coupled with two multi-stage axial-flux permanent magnet motors, which are fed by two separate inverters. A redundant configuration of the drives is developed in order to increase the availability of the steering service. Numerical analyses are carried out with reference to some significant operating conditions.