Drive torque refers to the rotational force generated by a motor or drive unit to produce a rotary motion or set a load in motion. It is one of the most important parameters in the design of drive systems, as it directly indicates the load a drive system can handle without exceeding its performance limits.
In physics, the drive torque describes the torque that arises when a force acts tangentially on a lever arm or a radius, thereby causing a rotational movement. A higher torque enables the drive to overcome greater resistance, move heavier loads or achieve higher accelerations. In many technical applications, such as spindles, ball screws, conveyor systems or robot joints, the available torque determines whether a system starts up reliably, operates precisely and can be run continuously.
The actual usable drive torque depends on several factors. These include, amongst others, the motor design, the power supply, temperature behaviour, the efficiency of the entire drive system, and the available gear ratios. If the torque is undersized, this can lead to overload, stalling or erratic operation. Sufficient sizing, on the other hand, ensures stable, dynamic and energy-efficient operation.
The drive torque is therefore a key parameter for the selection and design of drive and motion systems, and also forms the basis for calculating the required drive power.
