Method for Determining a Balancing Action to Balance an Electric Machine
AssigneeABB Schweiz AG
InventorsKari Saarinen, Krystof Kryniski
Life of this patent
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Abstract
A method for determining a balancing action for an electric machine includes collecting measurement data from a displacement sensor during rotation of the electric machine, the data relating to displacements of a shaft of the electric machine in a detection plane normal to a longitudinal axis of the shaft, estimating an unbalance force by predicting at least one displacement of the shaft in the at least one detection plane as a function of at least one potential unbalance force using a dynamic model of the electric machine, and comparing the measured displacements to the predicted at least one displacement, and determining the balancing action based on the estimated unbalance force.
Claims12
A computer-implemented method for determining a balancing action to balance an electric machine in an installed state, the electric machine comprising a stator, a rotor, a shaft fixed to the rotor, and at least one bearing supporting the shaft, such as at least one rolling element bearing, the method being performed by a control unit communicatively connected to a displacement sensor, the method comprising:
- collecting measurement data from the displacement sensor during rotation of the shaft in the installed state of the electric machine, the measurement data relating to measured displacements of the shaft in at least one detection plane normal to a longitudinal axis of the shaft,
- estimating an unbalance force based on the collected measurement data by predicting at least one displacement of the shaft in the at least one detection plane as a function of at least one potential unbalance force using a dynamic model of the electric machine, and comparing the measured displacements to the predicted at least one displacement,
- determining the balancing action based on the estimated unbalance force.
An electric machine assembly, comprising:
- a stator;
- a rotor;
- a shaft fixed to the rotor;
- at least one bearing supporting the shaft;
- a displacement sensor arranged to measure displacements of the shaft in at least one detection plane normal to a longitudinal axis of the shaft;
- and
- a control unit configured to carry out a computer-implemented method for determining a balancing action to balance the electric machine in an installed state, the method comprising:
- collecting measurement data from the displacement sensor during rotation of the shaft in the installed state of the electric machine, the measurement data relating to measured displacements of the shaft in at least one detection plane normal to a longitudinal axis of the shaft,
- estimating an unbalance force based on the collected measurement data by predicting at least one displacement of the shaft in the at least one detection plane as a function of at least one potential unbalance force using a dynamic model of the electric machine, and comparing the measured displacements to the predicted at least one displacement,
- determining the balancing action based on the estimated unbalance force.
Dependencies are inferred from the claim text.