Phase-loss detection for rotating field machine
AssigneeInternational Rectifier Corporation
InventorEddy Ho
Life of this patent
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Abstract
A method for detecting a loss of a phase in a multiphase rotating field machine, the method comprising providing a first electrical current into the machine windings to cause the current vector to assume a first current vector position, sensing a first current in at least one selected phase winding of the machine, comparing the sensed first current in the at least one selected phase winding with a first calculated current for the selected phase winding, and detecting that a first phase fault has occurred if the first calculated and sensed first currents differ by more than a predetermined value.
Claims22
A method for detecting a loss of a phase in a multiphase rotating field machine, the method comprising:
- providing a first electrical current into the machine windings to cause the current vector to assume a first current vector position;
- sensing a first current in at least one selected phase winding of the machine;
- comparing the sensed first current in the at least one selected phase winding with a first calculated current for the selected phase winding;
- and
- detecting that a first phase fault has occurred if the first calculated and sensed first currents differ by more than a predetermined value.
A system for detecting a loss of a phase in a multiphase rotating field machine, the system comprising:
- a device for providing a first electrical current into the machine windings to cause the current vector to assume a first current vector position;
- a sensor for sensing a first current in at least one selected phase winding of the machine;
- a comparator for comparing the sensed first current in the at least one selected phase winding with a first calculated current for the selected phase winding;
- and
- a detector for detecting a first phase fault if the first calculated and sensed first currents differ by more than a predetermined value.
Dependencies are inferred from the claim text.