Loss Evaluation of Small Sized Gear Reducer for Electric Motor (Influence of Load and Temperature)

概要

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In this paper, we evaluated the mechanical loss of the geared motor, which consists of an induction motor with a rated power of 90W and a two or three staged parallel gear reducer. The result shows that the total loss torque was composed of a constant amount of loss at no loading, or the torque independent part, and the frictional loss which was proportional to load torque. The loss at no loading, which is the internal loss of gear reducer part, greatly contributes to the total loss. It was confirmed that the loss torque hardly depends on the speed due to a trade off between an increase in loss with rotational speed and a decrease in viscosity of the base oil due to a temperature rise. While the gears were lubricated with lithium grease, churning loss was not observed since any excess grease was squeezed out from the region to be lubricated. Furthermore, grease lubrication had less loss at the tooth mesh region than oil lubrication, which provided more attachment on the tooth surface.