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What is the main difference between a servo drive and a stepper motor drive?

April 26, 2017drive main motor servo stepper

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What is the main difference between a servo drive and a stepper motor drive?

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A servo drive is a regulated system. The servo motor has a resolver for displacement measurement. There is a continuous comparison between the setpoint and actual position. This means that the servo drive travels exactly according to the specified motion profile. The servo motor has a high torque over the entire speed range and can be temporarily overloaded by 2-3 times the rated torque. The stepper motor drive is a controlled system. Positioning is carried out by specifying the number of control pulses. The torque is reduced over the speed range and if it is exceeded there is a risk of “stepper loss”.