What type of torque is required to bring a load up to its rated speed?

The type of torque required to bring a load up to its rated speed is referred to as pull-up torque. This torque is crucial in the operation of motors, as it represents the minimum torque needed to accelerate the rotor and the attached load from a standstill to its operating speed. When a motor starts, it initially experiences inertia and must overcome this to reach the desired speed. Pull-up torque ensures that the motor can effectively climb through any potential stall conditions during this acceleration phase.

In contrast, locked-rotor torque is the maximum torque a motor produces when it is stalled and not rotating. Full-load torque is associated with the torque required to maintain the motor at its rated load while running at its rated speed. Breakdown torque is the maximum torque the motor can deliver before it starts to lose speed and stall. Each of these types addresses different operational aspects of a motor, but when specifically considering the acceleration to the rated speed, pull-up torque is the key factor.