Modular Approach: Modular Approach

Modular Approach:

• Modular Approach:

• Modules of components (sizing, simulation)
• Architecture: combination of component modules
• Sizing wave

Module of components:

• Module of components:

• Sizing variables
• Definition parameters
• Simulation parameters

Principle:

• Principle:

• Rotation of a screw leading to a movement of translation of a nut. Nut based on rollers around the screw. End bearings maintain the roller-screw in position.
• Reduction ratio given by the lead (mm/rev) of the screw.

Scaling Laws

• Scaling Laws

• Constant maximum constraint in the material.
• Homothetic geometrical variation
• Screw dimension, lead  efficiencies
• Course, nut and bearing lengths  screw length and mass

Roller screw module:

• Roller screw module:

• Sizing variables
• Definition parameters
• Simulation parameters

General Description

• General Description

• Typical architecture for annular permanent magnet motor.
• high number of poles  + higher torque density, - lower speed

Scaling Laws:

• Scaling Laws:

• Homothetic scaling, constant induction
• Iron losses function of motor speed
• Constant max heat power dissipation PJ+Pf=Plosses
• Number of poles increasing with the motor size

Annular brushless motor module:

• Annular brushless motor module:

• Sizing variables
• Definition parameters
• Simulation parameters

Nose gear steering system

• Nose gear steering system

• Scaled to regional range commercial aircrafts

• Mission profile

• 3 electromechanical candidate architectures

Results:

• Results:

• In-house prototype developped within a Matlab environment
• Variation of total mass as function of transmition ratio for each architecture  Mass optimization  Architecture comparison