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Method of synchronous control of spindle motor and feed motor

  • US 5,010,286 A
  • Filed: 05/08/1989
  • Issued: 04/23/1991
  • Est. Priority Date: 09/14/1987
  • Status: Expired due to Term
First Claim
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1. A method of control of a spindle servomotor during machining, with a feed servomotor movably connected to the spindle servomotor such that the feed servomotor translationally moves the spindle servomotor along a longitudinal axis of the spindle servomotor, wherein the spindle servomotor has a torque limit versus rotational speed function curve represented by a straight line over a first speed range and a hyperbola over a second speed range, said method comprising the step of:

  • (a) detecting a rotational speed of the spindle servomotor;

    (b) moving the spindle servomotor along a longitudinal axis with a translational speed determined by a speed of the feed servomotor; and

    (c) controlling the speed of the spindle servomotor in response to said torque limit function curve such that the spindle servomotor is accelerated over said first speed range along a straight line to have a constant torque and over said second speed range along a hyperbola line to have a decreasing torque so as to maintain a maximum torque of said spindle servomotor as said spindle is moved longitudinally.

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