When performing motor selection, calculating torque is an essential step. Torque is a physical quantity that represents the magnitude of the force required to rotate an object around an axis. It is closely related to a motor’s output and rotational speed, and an incorrect calculation may prevent the equipment from operating properly. Conversely, selecting a motor with excessive specifications can lead to increased costs and space constraints, so caution is required.

This article explains the basic definition of torque and the proper use of units, as well as how to apply the calculation formula “T = 9550 × P/N,” which uses output and rotational speed.We have compiled practical information ranging from the concepts of load torque and safety factors to consider when performing motor selection, to the mechanism by which Geared motors increase torque. We also cover the use of the mN·m (millinewton-meter) unit commonly used for compact motors, making this content useful for those considering the selection of Micromotors.