Load state diagnosis device and load state diagnosis method for servomotor
First Claim
1. A load state diagnosis device for a servomotor which diagnoses a load state of the servomotor rotationally driving a rotary tool in a predetermined rotational drive direction at a constant speed, comprising:
- a detection part that detects a rotational direction of a torque acting on the servomotor;
a determination part that determines whether or not the rotational direction of the torque detected by the detection part is consistent with the predetermined rotational drive direction; and
a load index output part that outputs a load index indicating the load state of the servomotor based on a determination result of the determination part, wherein the load index output part calculates an integrated value of a period of a state in which the rotational direction of the torque is inconsistent with the predetermined rotational drive direction and outputs the load index based on the integrated value.
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Accused Products
Abstract
There are provided a load state diagnosis device and a load state diagnosis method for a servomotor. A PLC diagnoses the load state of the servomotor which rotationally drives a rotary tool in a predetermined rotational drive direction at a constant speed. The PLC includes a detection part that detects the rotational direction of a torque acting on the servomotor, a determination part that determines whether the rotational direction of the torque detected by the detection part is consistent with the predetermined rotational drive direction, and a load index output part that outputs a load index indicating the load state of the servomotor based on a determination result of the determination part.
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Citations
16 Claims
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1. A load state diagnosis device for a servomotor which diagnoses a load state of the servomotor rotationally driving a rotary tool in a predetermined rotational drive direction at a constant speed, comprising:
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a detection part that detects a rotational direction of a torque acting on the servomotor; a determination part that determines whether or not the rotational direction of the torque detected by the detection part is consistent with the predetermined rotational drive direction; and a load index output part that outputs a load index indicating the load state of the servomotor based on a determination result of the determination part, wherein the load index output part calculates an integrated value of a period of a state in which the rotational direction of the torque is inconsistent with the predetermined rotational drive direction and outputs the load index based on the integrated value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A load state diagnosis method for a servomotor which diagnoses a load state of the servomotor rotationally driving a rotary tool in a predetermined rotational drive direction at a constant speed, characterized in comprising:
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a detection process of detecting a rotational direction of a torque acting on the servomotor; a determination process of determining whether or not the detected rotational direction of the torque is consistent with the predetermined rotational drive direction; and a load index output process of outputting a load index indicating the load state of the servomotor based on a determination result, wherein an integrated value of a period of a state in which the rotational direction of the torque is inconsistent with the predetermined rotational drive direction is calculated and a load index based on the integrated value is outputted.
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Specification