Device for diagnosing turn-short fault of induction motor and method thereof
View Patent ↗A device for diagnosing a turn-short fault of an induction motor, the device including an induction motor; and a fault detecting unit to detect a current flowing in a supply line that supplies power to an input terminal of the induction motor and diagnose whether the induction motor has a fault, in which the fault detecting unit diagnoses whether the induction motor has the fault by applying a dynamic model. A method thereof is also disclosed.
1. A device for diagnosing a turn-short fault of an induction motor, the device comprising:
an induction motor; and
a fault detecting unit configured to detect a current flowing in a supply line that supplies power to an input terminal of the induction motor and diagnose whether the induction motor has a fault,
wherein the fault detecting unit is configured to diagnose whether the induction motor has the fault by comparing a first reverse phase component current in which a current provided to the induction motor is reversely converted with a second reverse phase component current obtained by applying a dynamic model.
2. The device of claim 1 , wherein when the first reverse phase component current is a same as the second reverse phase component current, the fault detecting unit is configured to diagnose that the induction motor has the fault.
3. The device of claim 1 , wherein when the first reverse phase component current is larger than the second reverse phase component current, the fault detecting unit is configured to increase a degree of fault of the second reverse phase component current until when the first reverse phase component current is a same as the second reverse phase component current.
4. The device of claim 1 , wherein the fault detecting unit includes:
a current detecting unit configured to detect the current flowing in the supply line;
a converting unit configured to convert the current detected in the current detecting unit into the first reverse phase component current;
a calculating unit configured to calculate the second reverse phase component current; and
a determining unit configured to diagnose whether the induction motor has the fault by comparing the first reverse phase component current with the second reverse phase component current.
5. The device of claim 4 , wherein the dynamic model is applied to the calculating unit of the fault detecting unit.
6. The device of claim 1 , wherein the second reverse phase component current represents a fault occurring by a virtual induction motor.
7. A device for diagnosing a turn-short fault of an induction motor, the device comprising:
an induction motor; and
a fault detecting unit configured to detect a current flowing in a supply line that supplies power to an input terminal of the induction motor and diagnose whether the induction motor has a fault, wherein the fault detecting unit is configured to diagnose whether the induction motor has a fault by applying a dynamic model,
wherein the dynamic model is defined through a following equation.
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8. A method of diagnosing a turn-short fault of an induction motor, the method comprising:
detecting a current provided to an induction motor;
converting the current detected from the induction motor into a first reverse phase component current;
calculating a second reverse phase component current from a virtual induction motor; and
determining whether the induction motor has the fault by comparing the first reverse phase component current and the second reverse phase component current.
9. The method of claim 8 , wherein the determining whether the induction motor has the fault includes diagnosing that the induction motor has a turn-short fault when the first reverse phase component current is a same as the second reverse phase component current.
10. The method of claim 9 , further comprising:
when the first reverse phase component current is larger than the second reverse phase component current, increasing a degree of fault of the second reverse phase component current until when the first reverse phase component current is the same as the second reverse phase component current.
11. The method of claim 8 , wherein the second reverse phase component current is obtained through a dynamic model, and
the dynamic model includes a following equatio—n.
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