Drive control system for motors
US4386305A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1980 |
| Grant date | May 31, 1983 |
| Priority date | — |
| Expiry date | Oct 27, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/49092
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A motor drive control system for use in a machine tool having spindle and feed shaft motors. If the spindle motor, which is rotating at a constant speed during a machining operation, is subjected to an overload, and consequently experiences a drop in speed, this fact is detected by a detector for detecting the armature current of the spindle motor. The feed shaft motor is slowed down to a predetermined speed if the overloaded condition continues for a prescribed period of time. The feed shaft motor is stopped if an even greater armature current is detected to be flowing due to a continuing overload despite the fact that the feed shaft motor has been slowed to the predetermined speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.