Patent ID: 6737771
Filing Date: 2004-05-18
Classification: H02P

Abstract:
A torque stabilizing device of a brushless servo motor comprising:a brushless servo motor for driving a driven body; a hall device of each phase for detecting a position of permanent magnet rotor of the brushless servo motor; a switching unit that receives a detection signal of the hall device to switch the passing of a current through a coil of each phase; a PI control computing section for performing a PI computation based on a detection value of said hall device and a predetermined target value; and an excitation duty computing section for outputting a power source control signal for said brushless servo motor based on an output signal of the PI control computing section, characterized by that a load direction detecting section that detects said driven body moving near to a target position and outputs a signal for stopping switching phase of a current passing through said brushless servo motor to stop switching the phase of the current.