Arrangement and method for determining the operational performance of a rotating electric machine
AssigneeSiemens Aktiengesellschaft
InventorChristian Deeg
Life of this patent
Estimating the term…
Abstract
An arrangement for determining the operational performance of a rotating electric machine connected to an operating voltage includes a sensor apparatus and a computing device. The sensor apparatus is designed to capture a stray magnetic field outside the machine and to calculate from the captured stray magnetic field a slip frequency and a synchronous frequency. An enhanced equivalent circuit diagram including predetermined, machine-specific parameters is stored on the computing device. The computing device is configured to determine, on the basis of the calculated slip frequency and synchronous frequency, a slip and then to determine the operational performance of the machine by the enhanced equivalent circuit diagram.
Claims18
An arrangement for determining an operational performance of a rotating electric machine connected to an operating voltage, the arrangement comprising:
- a sensor apparatus configured to detect a leakage magnetic field outside the rotating electric machine and to calculate a slip frequency and a synchronous frequency from the detected leakage magnetic field;
- and
- a computing facility storing an enhanced equivalent circuit diagram of the rotating electrical machine, the enhanced equivalent circuit diagram comprising predetermined machine-specific parameters, with the predetermined machine-specific parameters comprising inductances characterizing fluxes, resistances characterizing losses, and an additional resistance characterizing additional losses, said computing facility configured to establish a slip based on the calculated slip frequency and synchronous frequency, and subsequently to establish the operational performance of the machine by using the slip, the synchronous frequency, the operating voltage, and the predetermined machine-specific parameters as input variables for the enhanced equivalent circuit diagram.
A method for determining an operational performance of a rotating electric machine connected to an operating voltage, the method comprising steps:
- A) detecting a leakage magnetic field outside the rotating electric machine;
- B) calculating a slip frequency and a synchronous frequency from the detected leakage magnetic field;
- C) calculating a slip from the slip frequency and the synchronous frequency;
- and
- D) establishing an operational performance of the rotating electrical machine by using the slip, the synchronous frequency and predetermined machine-specific parameters, with the predetermined machine-specific parameters comprising inductances characterizing fluxes, resistances characterizing losses, the operating voltage, and an additional resistance characterizing additional losses, as input variables for an enhanced equivalent circuit diagram of the rotating electrical machine.
A system comprising:
- a rotating electric machine connected to an operating voltage and including a machine housing;
- and
- an arrangement for determining an operational performance of the rotating electric machine, the arrangement comprising a sensor apparatus arranged on an exterior of the machine housing and configured to detect a leakage magnetic field outside the rotating electric machine and to calculate a slip frequency and a synchronous frequency from the detected leakage magnetic field, and a computing facility storing an enhanced equivalent circuit diagram of the rotating electrical machine, the enhanced equivalent circuit diagram comprising predetermined machine-specific parameters, with the predetermined machine-specific parameters comprising inductances characterizing fluxes, resistances characterizing losses, and an additional resistance characterizing additional losses, said computing facility configured to establish a slip based on the calculated slip frequency and synchronous frequency, and subsequently to establish the operational performance of the machine by using the slip, the synchronous frequency, the operating voltage, and the predetermined machine-specific parameters as input variables for the enhanced equivalent circuit diagram.
Dependencies are inferred from the claim text.