Patent · US Expired

Process and device for monitoring and controlling the speed of rotation of an electric drive with frequency converter for hoisting gears

US5818185A · kind A · utility

7Cited by

8References

9Claims

0Family size

Assignee

Mannesmann AG · DE

Inventors

Holger Freitag · Bochum, DE
Anton Munzebrock · Dortmund, DE

Key dates

Filing date	Oct 25, 1995
Grant date	Oct 6, 1998
Priority date	—
Expiry date	Oct 25, 2015

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB66C13/26
WIPO fieldHandling
WIPO sectorMechanical engineering

Abstract

A process and a device for monitoring and/or controlling the speed of rotation of an electric drive having an asynchronous motor equipped with a braking device (11) and connected via a frequency adapter (13) to an alternating current system (12), e.g. three-phase system, to provide safe lifting and lowering of a load. The maximum torque (16) produced by the drive for lifting the load is set to be smaller than a holding torque (17) needed by the braking device (11) to hold the load in a stationary position.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.