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US 11,509,255 B2Granted
Electric machine fault detection scheme
AssigneeHamilton Sundstrand Corporation
InventorsGrzegorz Popek, Stephen Minshull
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Abstract
A short circuit detection system and method that identifies a short circuit between turns of a winding of a permanent magnet machine having a three-phase winding in response to detection of imbalances between the three motor phases at an instant in time. The imbalances are identified by monitoring motor terminal voltages and currents.
Claims8
A method of detecting an inter-turn short-circuit in a winding of a multiple phase motor, being a multiple winding permanent magnet machine, the method comprising:
- detecting an imbalance between current and/or voltage of winding of a multiple phase motor, being a multiple winding permanent magnet machine;
- and
- determining a short-circuit in a winding of the machine based on detection of the imbalance;
- wherein at zero to medium motor speeds, the imbalance is detected by injecting a high frequency signal into a signal provided to drive the motor and determining a short-circuit is based on an imbalance in a feedback signal from the motor;
- and
- wherein at higher motor speeds determining a short-circuit based on the signal to drive the motor.
3 more elements
Dependencies are inferred from the claim text.