State monitoring device, rotation positioning device, and state monitoring method

The condition monitoring device and method address the challenge of detecting gear damage in rotational positioning devices by calculating transmission errors and evaluating gear health, facilitating timely maintenance and preventing equipment failures.

JP2025174062APending Publication Date: 2025-11-28HITACHI LTD
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Patent Information

Application Number
JP2024080087
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-05-16
Publication Date
2025-11-28

AI Technical Summary

Technical Problem

Existing rotational positioning devices fail to accurately detect and evaluate the location and extent of selective damage, such as wear or chipping, on the teeth of gears that mesh with the stage, which are frequently used in specific angular positions, leading to potential equipment failure without timely maintenance.

Method used

A condition monitoring device and method that utilize transmission error calculation and damage evaluation means to assess gear damage by measuring the angular positions of input and output shafts, storing transmission error waveforms, and analyzing these waveforms to determine the extent and location of gear damage.

Benefits of technology

Enables accurate diagnosis of gear damage, allowing for proactive maintenance to prevent unplanned equipment downtime and maintain indexing performance by identifying and addressing damage to gears in rotational positioning devices.

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Abstract

To provide a state monitoring device, a rotation positioning device, and a state monitoring method capable of diagnosing a degree and a position of damage to a gear that meshes in the rotation positioning device.SOLUTION: A state monitoring device comprises a drive actuator for generating drive force, a first gear connected to the output shaft of the drive actuator, a second gear that meshes with the first gear, and a rotary stage that is connected to the output shaft of the second gear and is rotated and driven, and monitors a state of a rotation positioning device. The state monitoring device also comprises: transmission error calculation means for calculating a transmission error from an angle position of an input shaft of the drive actuator and an angle position of the output shaft of the second gear; and damage evaluation means for evaluating damage to a gear on the basis of information obtained from the transmission error calculation means.SELECTED DRAWING: Figure 1
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