Method and a device for controlling the operation of an actuator unit
US6407522B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2000 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Sep 18, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention concerns a method for controlling the operation of an actuator unit, comprising the steps: a) repeatedly reading the current fed to the actuator unit, b) a first comparison wherein the readings are compared with a first maximum level and if the readings are above the maximum level the electrical power fed to the actuator unit is cut off, c) a second comparison wherein two successive readings repeatedly are compared with each other and if the differences between the readings are below a first ramp level a number a steady state condition for the current fed to the actuator unit is detected, and d) if steady state is detected setting at least one overload detection limit on basis of a steady state reading of the current fed to the actuator unit. The invention also concerns a device for carrying out the method and a conveyor incorporating the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.