Method and apparatus for testing laminated cores of electrical machines

摘要

There is provided an apparatus and associated method for the testing of a laminated core ( 100 ) for an electrical machine. The apparatus supplies an excitation signal to the winding ( 102 ) of the electrical machine which is of a frequency higher than the rated operating frequency of the machine. There is also provided a phase sensitive detector ( 110 ) which receives, from the laminated core ( 100 ), a signal in response to the excitation signal. The phase sensitive detector ( 110 ) resolves the received signal into a number of components. These components are resolved relative to a reference signal. The size of the components determines the severity of any fault that exists within the laminated core ( 100.