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Control Theory Terminology

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Control Theory Terminology

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Common motion systems use three types of control methods. They are position control, velocity control and torque control. The majority of Newport’s motion systems use position control. This type of control moves the load from one known fixed position to another known fixed position. Feedback, or closed-loop positioning, is important for precise positioning. Velocity control moves the load continuously for a certain time interval or moves the load from one place to another at a prescribed velocity. Newport’s systems use both encoder and tachometer feedback to regulate velocity. Torque control measures the current applied to a motor with a known torque coefficient in order to develop a known constant torque.

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