what is stall torque and no load torque?

Question

in terms of an electric motor power vehicle, why is this important?

Answer 1

Stall torque is the torque that a motor develops at zero rotational rate, (i.e. the output shaft is clamped tight) and no-load torque is the torque developed at full motor speed without torque loading the motor. This is important to know since your goal as a designer is to size, gear and operate the motor at an operating torque that meets your needs for vehicle performance and motor reliability. Reliability will be driven by motor cooling requirements which in turn is governed by the operating point you have selected for the motor.

Answer 2

Stall torque is the amount of torque the moor can deliver when the shaft is locked and cannot turn. No load torque is a bit trickier but hte usual definition is the amount of torque the motor can deliver to a load with 'essentially' no change in shaft speed from a true, no load condition. 'Essentially' usually means 1% or so, but read the spec. sheet for the motor. Different companies define it differently.

HTH ☺

Doug