초록

Another embodiment of the present invention is particularly useful in the manufacture of fractional horsepower electric motors and especially in the performance of quality control testing.

대표청구항 ▼

[ We claim:] [1.] A fault detection system for monitoring the operational condition of an electric motor operating with an unknown load comprising:sensors coupled to said motor for measuring selected operating parameters; andcomputer means coupled to said sensors:i) for determining, when said motor

[ We claim:] [1.] A fault detection system for monitoring the operational condition of an electric motor operating with an unknown load comprising:sensors coupled to said motor for measuring selected operating parameters; andcomputer means coupled to said sensors:i) for determining, when said motor is operating in a fault free condition, an residual of zero, said first residual derived by multiplying said selected operating parameters by invariants and summing the products;ii) for selecting a threshold level different than zero,iii and for determining a plurality of residuals of said motor during operation; said computer means having a memory for comparing each of said plurality of residuals with said first residual and for displaying a message indicative of whether said motor is operating under fault free conditions in the case where said plurality of residuals is less than the threshold level or whether said motor is operating with impending failure in the case where at least one of said plurality of residuals exceeds the threshold level.