Servo motor control apparatus

Abstract

A servo motor control apparatus effecting a feedback control of a servo motor according to an external operation command. The apparatus includes: an operational running state detecting unit for detecting a running state of the servo motor; a memory unit in which data representing inter-relation values are stored; a current value computing unit for computing an appropriate drive current value for the external operation comand; and a driving unit for driving the servo motor according to the computed appropriate drive current value. By defining the inter-relation values in advance in accordance with operational states of the servo motor so that a drive power of the servo motor approximates a value indicated by the external operation command and specifying an inter-relation value corresponding to the detected operational state with reference to the defined inter-relations to compute the appropriate drive current value, it is possible to compensate a phase difference between a current command value and an actual current irrespective of the rotational speed; and improve the response of the control apparatus to decrease a time lag of an output torque and a microscopic fluctuation thereof.

Dependencies are inferred from the claim text.