Complexity in mechanical assemblies is not necessarily a good thing. More moving parts typically translates to more potential points of failure, greater inefficiencies, and relatively poor reliability. There is a reason why the power transmission is the most common cause of vehicular faults and the largest source of mechanical losses. This is because multiple integrated gears and shafts are used to drive the load. Additionally, the gearbox can contribute objectionable amounts of noise, vibration, and harshness (NVH) which is unappealing to consumers.
Direct drive technology has been available for a long time, but it has experienced significant uptake in recent years in applications varying from the automotive sector through to clean energy generation. So, what benefits do direct drive motors offer over conventional motors?