Torque stabilizer for brushless servo motor
First Claim
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1. 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.
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Abstract
When it is judged that a driven body reaches vicinity of a target position, a present phase of the passing current is not switched to keep a state of the passing current even if a phase of a passing current needs to be switched judging from the position of permanent magnet rotor thereby a stabilizing of torque can be attained.
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3 Claims
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1. A torque stabilizing device of a brushless servo motor comprising:
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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. - View Dependent Claims (2, 3)
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Specification