1.4. Quiz#
Test yourself with this quiz.
1.5. Design drivers and sizing scenarios#
1.5.1. Keywords on design drivers and sizing scenarios#
Design drivers:
Operational limits
Transient: rapid degradations
Continuous: gradual degrationImperfections (Energy storage, Losses)
Sizing scenarios:
Functions of the system
Design drivers of components
1.5.2. Ballscrew#
Rapid and gradual degradations of Ball and roller screws are defined by specific parameters.
The first one is defined by: “Load acting on the axis of the screw resulting in a nominal life of one million revolutions”
1.5.3. Electric motor#
The operational limits of a brushless motors is defined by the following diagram.
Match the ABC boundaries of the torque/speed characteristic with the physical limitations of a brushless motor-drive combination. Also indicate whether the operational limit is transient or continuous.
1.5.4. Imperfections Power transmission#
Power transmission components have imperfections such as inertia. A ball screw SDS 14x4 of 0.5 m is associated with a reducer of reduction ratio 3 and a NX205 brushless motor. Using informations given in the following datasheet, calculate the inertia of the components.
