초록 ▼

The present invention relates to fault detection in a large population of motors of a common motor type. Initially, a plurality of motors of a common motor type is tested to obtain a first residual based on selected measured operating parameters. A second residual is then developed for each individu

The present invention relates to fault detection in a large population of motors of a common motor type. Initially, a plurality of motors of a common motor type is tested to obtain a first residual based on selected measured operating parameters. A second residual is then developed for each individual motor comprising the plurality of motors. If the difference between the first and second residuals exceeds a selected threshold, the motor generating the second residual is defective and removed from the plurality of motors and the threshold is adjusted to reflect the removal of the defective motor from the plurality of motors. The first residual may be used to monitor the operation of motors not included in the original plurality of motors to detect impending failure.

대표청구항 ▼

1. A method for screening manufacturing quality of a plurality of motors of a common motor type and for detecting mechanical faults in at least one motor of said plurality of motors, said method comprising the steps of:selecting a plurality of motors comprising motors operating fault free and motors

1. A method for screening manufacturing quality of a plurality of motors of a common motor type and for detecting mechanical faults in at least one motor of said plurality of motors, said method comprising the steps of:selecting a plurality of motors comprising motors operating fault free and motors operating with one or more unknown faults; measuring a plurality of operating signals for each motor in said plurality of motors; using said plurality of operating signals, solving a first set of discrete state space equations for said plurality of motors, where said first set of discrete state space equations are in the form of: x(k+1)=Ax(k)+Bu(k) y(k)=Cx(k) where x, u, and y are a state vector, an input vector, and an output vector, respectively, k denotes discrete time increments and A, B, and C are known nominal matrices of said plurality of motors; for each motor in said plurality of motors, solving a second set of discrete state space equations in the form of: x(k+1)=Ax(k)+Bu(k) y(k)=Cx(k); comparing the solution of said second set of discrete state space equations for each motor in said plurality of motors with the solution of said first set of discrete state space equations for said plurality of motors to identify a faulty motor; removing said faulty motor from said plurality of motors to form a second plurality of motors; and re-calculating said first set of discrete state space equations for said second plurality of motors.