The stall torque as you expressed it depends on motor torque, which depends on the DC motor's armature current (assuming a standard PM DC motor). So if you limit the max current to X, it will lift a 1kg load but stall (or go backwards) with a 1.5kg load. To find X you use a variable DC powersupply, and an ammeter. Torque should be proportional to current, whether stalled or not. Measure the current at stall. Is it what you expected? It should be just the applied voltage divided by the DC resistance of the motor coils that are switched in. Also consider that there can be significant ripple on the torque over a rotation. Nov 18, 2014 · Starting torque is the maximum torque that can be produced by a motor in order to start rotational movement of the load. Stall torque is the maximum torque that can be applied to the shaft and cause the motor to stop rotating. When there is no rotation in the motor,...

Stall current is the maximum current the motor will draw when the rotor is at zero rpm. Stall current is the same as Locked Rotor Amps (LRA), Max Amps, & starting Amps. Measuring a high power motor for stall current is difficult as there are pitfalls in some methods of testing. Given a constant v m, we can plot the speed of the motor as a function of the torque it produces (in steady state). The curve is just a straight line, as illustrated below. This equation allows us to calculate the stall (or starting) torque, by plugging in n = 0. This is the maximum torque the motor can generate.