SYS-5. Influence of gearbox types

Analyze efficiency (at several loads), weight and cost of electromechanical part of drive train (gearbox + electric machine) for the two applications:

Wind turbine

Parameters: Torque 10 kNm, Speed 30 rpm, overspeed 1,2, grid 6000 V.

Compare the following three variants of gearbox stages and electric machines: (1) Pl+Pl+Hel+SCIM vs (2) Pl+Pl+Hel+PMSM vs (3) Pl+Pl+PMSM, where "Pl" means planetary gear stage, "Hel" means helical gear stage.

Fig.1. Gearbox with 2 planetary stages and one helical stage - "Pl+Pl+Hel" (Source: Romax).

Conveyor

Parameters: Torque 10 kNm, Speed 200-300 rpm, grid 400 V.

Compare the following three variantsof gearbox stages and electric machines: (1) Worm+SCIM vs (2) Hel+Hel+SCIM vs (3) Hel+Bevel+SCIM, where "Worm" means worm gearbox.

Fig.2. Gearbox with 1 worm stage - "Worm".

Reflect on efficiency if operation is at partial load most of the time. Collect results in the tables (separate table for each application).