Motor controller detecting abnormality of power transmission unit between main spindle and motor
First Claim
1. A motor controller detecting an abnormality in a power transmission unit that connects a motor and a main spindle of a machine tool and has a known speed reduction ratio, the motor controller comprising:
- a single-rotation signal detector detecting a single-rotation signal that indicates a single rotation of the main spindle;
a rotation angle detector detecting a rotation angle of the motor every predetermined time;
a counter adding up the rotation angle detected by the rotation angle detector every predetermined time, a value of the counter being reset when the single-rotation signal detector detects the single-rotation signal of the main spindle, the counter outputting a counter value; and
a judgment unit receiving only the counter value as an input and judging that a belt in the power transmission unit has an abnormality when a value of the rotation angle of the motor added up in the counter is greater than a predetermined value before the counter is reset by the single-rotation signal detector.
1 Assignment
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Accused Products
Abstract
A motor controller includes a single-rotation signal detector detecting a single-rotation signal that indicates a single rotation of a main spindle, a rotation angle detector detecting a rotation angle of a motor every predetermined time, and a counter adding up the rotation angle. A value of the counter is reset when the single-rotation signal detector detects the single-rotation signal of the main spindle. The motor controller further includes a judgment unit judging that a power transmission unit has abnormality when a value of the rotation angle of the motor added up in the counter deviates from a predetermined range.
45 Citations
14 Claims
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1. A motor controller detecting an abnormality in a power transmission unit that connects a motor and a main spindle of a machine tool and has a known speed reduction ratio, the motor controller comprising:
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a single-rotation signal detector detecting a single-rotation signal that indicates a single rotation of the main spindle; a rotation angle detector detecting a rotation angle of the motor every predetermined time; a counter adding up the rotation angle detected by the rotation angle detector every predetermined time, a value of the counter being reset when the single-rotation signal detector detects the single-rotation signal of the main spindle, the counter outputting a counter value; and a judgment unit receiving only the counter value as an input and judging that a belt in the power transmission unit has an abnormality when a value of the rotation angle of the motor added up in the counter is greater than a predetermined value before the counter is reset by the single-rotation signal detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification