Method for determining the active power of asynchronous electric

Details Method for determining the active power of asynchronous electric Method for determining the active power of asynchronous electric

1998-09-24

1999-12-28

Masih, Karen

Electricity: motive power systems

Motor load, armature current or force control during...

318432, 318434, 318625, 318798, 318461, 318463, 318569, H02P 104

Patent

active

06008605&

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.

REFERENCES:
patent: 4091294 (1978-05-01), Zankl et al.
patent: 4157658 (1979-06-01), Grice
patent: 4204425 (1980-05-01), Mallick, Jr.
patent: 4320662 (1982-03-01), Schaub et al.
patent: 4490094 (1984-12-01), Gibbs
patent: 5421302 (1995-06-01), Livshits et al.
patent: 5747960 (1998-05-01), Quaggio

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