Patent ID: 8508220

Claim:
A method of evaluating the condition of a laminated core of an electric machine, comprising: positioning a first yoke extending between a first pair of teeth of the laminated core, the first yoke having a pair of arms in engagement with the first pair of teeth and the first yoke being wound with a first winding; positioning a second yoke extending between a second pair of teeth of the laminated core, the second pair of teeth being different than the first pair of teeth, the second yoke having a pair of arms in engagement with the second pair of teeth and the second yoke being wound with a second winding; supplying power to an electrical circuit defined by one of the first and second windings to produce a magnetic flux in the yoke corresponding to the one of the first and second windings and defining an excitation yoke; and measuring a characteristic of an electrical circuit defined by the other one of the first and second windings to identify a fault corresponding to an eddy current between individual laminations in the laminated core.