Controller for machine tool including main shafts
US9377774B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 2014 |
| Grant date | Jun 28, 2016 |
| Priority date | — |
| Expiry date | Sep 19, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/50083
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A controller for a machine tool includes a converter converting AC power on the power supply side to DC power, a feed-shaft motor inverter converting DC power on a DC link side and AC power on a feed shaft motor side, first and second main-shaft-motor inverters converting DC power on the DC link side and AC power on first and second main shaft motors side, a power failure detection unit detecting a power failure on the power supply side, a voltage detection unit detecting a DC link voltage value, a feed-shaft-motor command unit outputting a deceleration command to the feed-shaft-motor inverter upon a power failure, and a main-shaft-motor command unit outputting an acceleration/deceleration command to the first main-shaft-motor inverter in accordance with the DC link voltage value and a power shutoff command to the second-main-shaft-motor inverter upon a power failure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.