Match Motor Torque to Load: A Quick Guide

When selecting a motor, the most critical step is matching its torque to your load's requirements. Undersizing leads to stalling or overheating; oversizing wastes energy and cost. The key is to calculate the required torque at the load, then account for transmission losses and safety factors.

Start by determining the load torque: the force needed to overcome friction, inertia, and work. For linear motion, torque = force × radius of the driving pulley. For rotary loads, torque = moment of inertia × angular acceleration plus constant torque. Use manufacturer data for friction coefficients.

Don't forget the gearbox or belt drive. If you use a reduction ratio, the motor sees a reflected inertia and torque reduced by the ratio. Include efficiency losses (typically 90-95% per stage). The motor's continuous torque rating must exceed the RMS torque over the duty cycle.

Apply a safety factor of 1.2-1.5 for unexpected loads or wear. Verify peak torque for acceleration phases doesn't exceed motor's peak rating. Finally, test under real conditions. A good match ensures smooth operation and long life.

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