Method and apparatus for determining an operating point of a work machine

US8763464B2 · kind B2 · utility

Assignee

• KSB Aktiengesellschaft · DE

Inventors

• Christoph Emde · Frebershausen, DE
• Stefan Laue · Havelsee, DE
• Marjan Silovic · Bischofswerda, DE

Key dates

• Filing date: Nov 18, 2011
• Grant date: Jul 1, 2014
• Expiry date: Oct 30, 2032

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04D15/0094
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Method and apparatus for determining an operating point of a work machine and/or asynchronous motor driving the same, the operating point being characterized by the power consumed by and/or output rate of the machine, in which one or more operating point-dependent measurement variables of the machine are detected by sensors, and the measured values are evaluated and/or stored during operation of the machine. The operating point is determined without using electric measurement variables of the motor by determining a frequency linearly proportional to the fundamental tone of the machine through signal analysis, especially frequency analysis of a measured mechanical variable selected from pressure, differential pressure, power, vibration, and solid-borne or air-borne sound. From this, the rotational speed of the driving machine is determined, and the operating point characterized by the power consumed by and/or output rate of the machine is determined utilizing the rotational speed/torque relationship of the motor.