1. How do you diagnose a noisy gearbox & electric motor?

To minimize noise, all gearbox & electric motor components should be optimally tuned to each other. Three types of gear tooth transmission errors are spacing errors, random errors, and elastic deformations, which combine with mean profile deviations. Gear resonance can be reduced by identifying excitation mechanisms; using finite element analysis to determine the natural frequencies of individual gears; eliminating torsional modes from operating range; detuning and damping helical and bevel gears; and identifying remaining resonant problems with other elements of the gearmotor such as the housing and electric motor.