Reliance Electric Industrial Company

Dbt Deutsche Bergbau-technik Gmbh

Westfalia Becorit Industrietechnik Gmbh

Martin Eickhoff

Jens Titschert

Wilfried Weigel

Arno Breimhorst

Bernd-Christian Pago

Arno Breimhost

Bernhard Voss

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.

Method for determining the active power of asynchronous electric motors

A drive system for driving a flexible elongate member such as a haulage chain for a mineral mining machine or scraper-chain assembly of a scraper-chain conveyor of a mineral mining installation employs main and auxiliary drive units each equipped with an electric asynchronous motor drivably connected through a gearing assembly to a sprocket around which the chain or scraper-chain assembly is entrained. The gearing assemblies each employ a multi-disc clutch which is subjected to variable loading pressure and slippage by means of a valve actuated by electrical signals provided by an electronic controller. Each clutch acts through gears on a ring gear of planetary gearing and the ring gear wheel is subjected to a controlled supportive torque. The electronic controller is designed to actuate the associated valves to adjust the clutches to balance loading on the motors of the units. During a start-up phase the controller functions to ensure the force transmitted to the chain or scraper-chain assembly slowly and progressively increases and sudden loading is avoided. In the event of overloading the controller causes the valves to actuate the clutches rapidly to allow the ring gears of the planetary gearings to rotate freely to disconnect the drive.

Driving system for driving flexible elongate members, such as chains or

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Dortmund, Germany

Martin Eickhoff