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By O'Neil S.J.

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Commutator: A mechanical cylinder consisting of alternating segments of conductive and insulating material. This cylinder used in DC motors passes currents from the brushes into the rotor windings and performs motor commutation as the motor rotates. Compensation: The corrective or control action in a feedback loop system which is used to improve system performance characteristics such as accuracy and response time. Compensation, Feedforward: A control action which depends on the command only and not the error to improve system response time.

Hybrid Stepping Motor: A motor designed to move in discrete increments or steps. The motor has a permanent magnet rotor and wound stator. These motors are brushless and phase currents are commutated as a function of time to produce motion. Hysteresis: For a system with an analog input and digital output, the output value is dependent on both the input value and output state such that there is an input range over which the output can be high or low. I/O: Input/Output. The reception and transmission of information between control devices.

Absolute Programming: A positioning coordinate reference wherein all positions are specified relative to some reference, or Issued: Dec. 98 Copyright © 1998 Micro Mo Electronics, Inc. Page 29 “home” position. This is different from incremental programming, where distances are specified relative to the current position. AC Adjustable-Speed Drive: All equipment required to adjust the speed or torque of AC electric motor(s) by controlling both frequency and voltage applied to the motor(s). AC Servo Drive: A servo drive used to control either or both synchronous or induction AC motors.

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