초록 ▼

A method and system for early detection of incipient faults in an electric motor are disclosed. First, current and voltage values for one or more phases of the electric motor are measured during motor operations. A set of current predictions is then determined via a neural network-based current pred

A method and system for early detection of incipient faults in an electric motor are disclosed. First, current and voltage values for one or more phases of the electric motor are measured during motor operations. A set of current predictions is then determined via a neural network-based current predictor based on the measured voltage values and an estimate of motor speed values of the electric motor. Next, a set of residuals is generated by combining the set of current predictions with the measured current values. A set of fault indicators is subsequently computed from the set of residuals and the measured current values. Finally, a determination is made as to whether or not there is an incipient electrical, mechanical, and/or electromechanical fault occurring based on the comparison result of the set of fault indicators and a set of predetermined baseline values.

대표청구항 ▼

A method and system for early detection of incipient faults in an electric motor are disclosed. First, current and voltage values for one or more phases of the electric motor are measured during motor operations. A set of current predictions is then determined via a neural network-based current pred

A method and system for early detection of incipient faults in an electric motor are disclosed. First, current and voltage values for one or more phases of the electric motor are measured during motor operations. A set of current predictions is then determined via a neural network-based current predictor based on the measured voltage values and an estimate of motor speed values of the electric motor. Next, a set of residuals is generated by combining the set of current predictions with the measured current values. A set of fault indicators is subsequently computed from the set of residuals and the measured current values. Finally, a determination is made as to whether or not there is an incipient electrical, mechanical, and/or electromechanical fault occurring based on the comparison result of the set of fault indicators and a set of predetermined baseline values. and K.A. Gschneidner, Jr., "Phase relationships and Crystallography in the Pseudobinary System Gd5Si4--Gd5Ge4", J. Alloys Compds. 260, 98-106 (1997). V.K. Pecharsky and K.A. Gschneidner, Jr., "Tunable Magnetic Regenerator Alloyss with a Giant Magnetocaloric Effect for Magnetic Refrigeration from ＿20 to＿290K", Appl. Phys. Lett. 70, 3299-3301 (1997). V.K. Pecharsky and K.A. Gschneidner, Jr., "Giant Magnetocaloric Effect in Gd5(Si2Ge2)", Phys. Rev. Lett. 78, 4494-4497 (1997). V.K. Pecharsky and K.A. Gschneidner, Jr., "Effect of Alloying on the Giant Magnetocaloric Effect of Gd5(Si2Ge2)", J. Magn. Magn. Mater. 167, L179-L184 (1997). T.B. Massalski, Editor-in-Chief, Binary Alloy Phase Diagrams, 2nded., ASM International, Materials Park, Ohio (1990). D.H. Dennison, M.J. Tschetter and K.A. Gschneidner, Jr., "The Solubility of Tantalum in Eight Liquid Rare-Earth Metals", J. Less-Common Metals 10, 109-115 (1965). P. Rogl, "Phase Equilibria in Ternary and Higher Order Systems with Rare Earth Elements and Silicon" in Handbook on the Physics and Chemistry of Rare Earths, K.A. Gschneidner, Jr. and L. Eyring, eds., Elsevier Science Publishers, B.V., Amsterdam, pp. 92-94 (1984). L. Morellon, P.A. Algarabel, M.R. Ibarra, J. Blasco, and B. Garcia-Landa, "Magnetic-field-induced structural phase transition in Gd5(Si1.8 Ge2.2)", Phys. Rev. B58, 721-724 (1998). L. Morellon, J. Stankiewicz, B. Garcia-Landa, P.A. Algarabel, and M.R. Ibarra, "Giant magnetoresistance near the magnetostructural transition in Gd5(Si1.8 Ge2.2)", Appl. Phys. Lett. 73, 3462-3464 (1998). L. Morellon, J. Blasco, P.A. Algarabel, and M.R. Ibarra, "Nature of the first-order antiferromagnetic-ferromagnetic transition in the Ge-rich magnetocaloric compounds Gd5(SixGe1-x)4", Phys. Rev. B62, 1022-1026 (2000). J. Stankiewicz, L. Morellon, P.A. Algarabel, and M.R. Ibarra, "Hall effect in Gd5(Si1.8 Ge2.2)", Phys. Rev. B61, 12651-12653 (2000). L. Morellon, P.A. Algarabel, C. Magen, and M.R. Ibarra, "Giant magnetoresistance in the Ge-rich magnetocaloric compound, Gd5(Si0.1 Ge0.9)4", J. Magn. Magn. Mater. 237, 119-123 (2001).