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Stepper Fundamentals Slide 18

When this point is reached, the motor has most likely already stalled if it has any load on it. Since the torque is proportional to the current in the motor, the torque will decrease as the peak current decreases. An earlier slide showed the speed torque curve with a downward slope at increasing speed. This reduction in the peak current at higher speed is one of the contributing factors. If the time constant of the current could be decreased, better performance from the motor can be expected.

PTM Published on: 2011-12-14