Patent ID: 8427192

Claim:
A computerized method of modifying the frequency of testing an electric motor, comprising: receiving as a first input, data representative of insulation resistance of windings of the electric motor; receiving as a second input, data representative of a temperature associated with the windings during a measuring of the insulation resistance of the electric motor windings; automatically and electronically normalizing the data representative of the temperature associated with the windings based on a common temperature, the common temperature being forty degrees Celsius; determining a normalized insulation resistance value of the electric motor windings by applying the normalized temperature data to the data of the first input, which is representative of the insulation resistance of the windings; automatically storing in a nonvolatile storage medium the normalized insulation resistance value of the electric motor windings; electronically plotting and displaying the determined normalized insulation resistance value on a resistance versus time graph, the graph including a previously determined normalized insulation resistance value, the previously determined normalized insulation resistance value having been previously stored in the nonvolatile storage medium; electronically determining a slope of decline of the insulation resistance of the windings over time by comparing the previously determined normalized insulation resistance value with the determined normalized insulation resistance value; comparing the slope of decline with a first predetermined slope value stored in the nonvolatile storage medium; if the slope of decline exceeds the first predetermined slope value, decreasing a time interval until the next determination of a normalized insulation resistance value of the electric motor, as compared to a time interval between a time of said previously determined normalized insulation resistance value and a time of said determined normalized insulation resistance value; if the slope of decline does not exceed the first predetermined slope value, keeping same the time interval until the next determination of a normalized insulation resistance value of the electric motor; and electronically outputting a time for the next determination of normalized insulation resistance.