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US 2010/0244887 A1Published application
Method for detecting a step loss condition
AssigneeSemiconductor Components Industries, LLC
InventorBart De Cock
Life of this patent
Estimating the term…
Abstract
A method for detecting and correcting for a step loss condition. A back electromagnetic force signal is measured and compared to a reference voltage. The motor continues operating and the back electromagnetic force signal is measured again and compared to the reference voltage. If the measured levels of the back emf voltages are less than the reference voltage, a step loss condition has occurred and the stator field is repositioned.
Claims20
A method for detecting a fault condition in a motor, comprising:
- providing a time-varying parameter of an energy storage device;
- comparing an electromagnetic force signal with a first reference signal at a first time when the time-varying parameter is at a predetermined level;
- comparing the electromagnetic force signal with one of the first reference signal or a second reference signal at a second time when the time-varying parameter is at the predetermined level;
- and
- determining that the fault condition has occurred if the electromagnetic force signal at the first time is less than the first reference signal and the electromagnetic force signal at the second time is less than the second reference signal or if the electromagnetic force signal at the first time is greater than the first reference signal and the electromagnetic force signal at the second time is greater than the second reference signal.
2 more elements
A method for detecting a step loss condition in a motor, comprising:
- determining a level of a first electromagnetic force signal;
- and
- comparing the level of the first electromagnetic force signal with a first reference signal at a first time.
Dependencies are inferred from the claim text.