Diagnosis system for ball screw unit and motor control system
US11242919B2 · kind B2 · utility
3Cited by
1References
5Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 11, 2018 |
| Grant date | Feb 8, 2022 |
| Priority date | — |
| Expiry date | Dec 11, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/024
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An object of the present invention is to preferably detect the failure accompanied with the decrease in the pre-load in a ball screw unit. The failure diagnosis is performed for the ball screw unit on the basis of a combination of a resonance frequency in an axial direction of a predetermined machine assembly including the ball screw unit and a motor and a position of a nut member on a screw shaft corresponding to the resonance frequency as provided when the screw shaft is driven and rotated by the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.