Method of determining the rotational speed of a machine, and dev

Electricity: measuring and testing – Electrical speed measuring – Speed comparing means

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364565, G01P 356

Patent

active

050991973

ABSTRACT:
Method of determining the rotational speed of a machine having a drive into which a setpoint value for the rotational speed has been introduced and a rotational-speed sensor from which a measured actual value is obtainable, which comprises feeding the setpoint value to a mathematical model of a controlled system formed by the drive and the machine, deriving from the output of the mathematical model a computed actual value, determining the difference between the measured actual value and the computed actual value, forming the absolute value of the difference, and, if the absolute amount of the difference is exceeded, passing on the computed actual value, and if the absolute amount of the difference is not exceeded, passing on the measured actual value; and device for performing the method as the determined rotational speed of the machine.

REFERENCES:
patent: 4305025 (1981-12-01), Arnold
patent: 4484137 (1984-11-01), Chang
Publication "Regelungsbechnik", vol. 26, 1978, Issue 11, pp. 349-380, article Drehzahlregelung . . .
Publication "Proceedings IECON '87, 1987 Inbl. Conference on Industrial Electronics, Control, and Instrumentation", Cambridge, Mass., Nov. 3-6, 1987, pp. 184-186, I. Dobe and M. Iganashi.

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