Method for determining the active power of asynchronous electric motors

US6008605A · kind A · utility

Assignee

• DBT Deutsche Bergbau-Technik GmbH · DE

Inventors

• Wilfried Weigel · Werne, DE
• Arno Breimhorst · Hagen, DE
• Jens Titschert · Grafenau, DE
• Martin Eickhoff · Ismaning, DE

Key dates

• Filing date: Sep 24, 1998
• Grant date: Dec 28, 1999
• Expiry date: Sep 24, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/343
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for determining the active power (P) of asynchronous electric motors of winning and conveying equipment in underground mining. According to the invention, particularly easy and accurate determination of the instantaneous active power of the motors is obtained by storing the individual motor characteristic (P(n); M(n)) of each motor in a computer, by detecting the instantaneous speed (n, n') of the motor with the aid of a tachometer and by comparing this speed with the characteristic stored in the computer, the active power being derived from the torque value or power value assigned to the detected instantaneous speed, as stored in the computer. This particularly rapid and simple calculation of the power value does not require any readings to be taken at the power supply to the motors.