5. Various gearboxes

Electrical solution

Originally a combination of a dynamo and a DC motor, it is now produced using an autosynchronous motor.

Mechanical meshing solution

• With fixed rotation axes

  In a single-stage or multi-stage solution, the ratio $\frac{1}{k}$ is between 1/5 and 5; beyond that, it is preferable to design with multi-stages, but with the disadvantage of a drop in efficiency.

  Power-to-weight ratios are very high, on the order of 10 kW/kg.

  Figure 14...