Method and device for identifying a faulty rotor position angle signal
AssigneeSiemens Aktiengesellschaft
InventorsStefan Künzel, Mihaly Nemeth-Csoka
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Abstract
A method and a system for identifying a faulty rotor position angle signal of a synchronous motor powered by a converter, wherein a first flux angle is determined from the rotor position angle signal, wherein from the motor currents of the synchronous motor a current pointer is determined, wherein from a voltage pointer of the motor voltages of the synchronous motor and the current pointer a second flux angle is determined using a flux modeler of the synchronous motor, and wherein in the event of insufficient agreement between the first and second flux angle a faulty rotor position angle signal is identified.
Claims13
A method for identifying a faulty rotor position angle signal of a synchronous motor powered by a converter, comprising the steps of:
- measuring a rotor position angle signal of the synchronous motor;
- determining from the measured rotor position angle signal a first flux angle;
- measuring at least one motor current of the synchronous motor;
- determining from the measured motor current or motor currents a current pointer;
- measuring at least one motor voltage of the synchronous motor;
- determining from the measured motor voltage or motor voltages a voltage pointer;
- determining, with a flux modeler that models a flux of the synchronous motor, a second flux angle from the voltage pointer and the current pointer;
- and
- identifying a faulty rotor position angle signal based on an agreement, or lack thereof, between the first and second flux angles.
A data carrier with a computer program stored on the data carrier, said computer program causing a computer to identify a faulty rotor position angle signal of a synchronous motor powered by a converter, by executing in the computer comprising the steps of:
- measuring a rotor position angle signal of the synchronous motor;
- determining from the measured rotor position angle signal a first flux angle;
- measuring at least one motor current of the synchronous motor;
- determining from the measured motor current or motor currents a current pointer;
- measuring at least one motor voltage of the synchronous motor;
- determining from the measured motor voltage or motor voltages a voltage pointer;
- determining, with a flux modeler that models a flux of the synchronous motor, a second flux angle from the voltage pointer and the current pointer;
- and
- identifying a faulty rotor position angle signal based on an agreement, or lack thereof, between the first and second flux angles.
A computer with a program memory having stored therein a computer program, said computer program being called by the computer and causing the computer to identify a faulty rotor position angle signal of a synchronous motor powered by a converter by executing in the computer comprising the steps of:
- measuring a rotor position angle signal of the synchronous motor;
- determining from the measured rotor position angle signal a first flux angle;
- measuring at least one motor current of the synchronous motor;
- determining from the measured motor current or motor currents a current pointer;
- measuring at least one motor voltage of the synchronous motor;
- determining from the measured motor voltage or motor voltages a voltage pointer;
- determining, with a flux modeler that models a flux of the synchronous motor, a second flux angle from the voltage pointer and the current pointer;
- and
- identifying a faulty rotor position angle signal based on an agreement, or lack thereof, between the first and second flux angles.
A machine tool or production machine with a controller that identifies a faulty rotor position angle signal of a synchronous motor powered by a converter comprising the steps:
- measuring a rotor position angle signal of the synchronous motor;
- determining from the measured rotor position angle signal a first flux angle;
- measuring at least one motor current of the synchronous motor;
- determining from the measured motor current or motor currents a current pointer;
- measuring at least one motor voltage of the synchronous motor;
- determining from the measured motor voltage or motor voltages a voltage pointer;
- determining, with a flux modeler that models a flux of the synchronous motor, a second flux angle from the voltage pointer and the current pointer;
- and
- identifying a faulty rotor position angle signal based on an agreement, or lack thereof, between the first and second flux angles.
Dependencies are inferred from the claim text.