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US 6,941,785 B2Granted
Electric fuel pump condition monitor system using electrical signature analysis
AssigneeUT-Battelle, LLC
InventorsHoward D. Haynes, Daryl F. Cox, Donald E. Welch
Life of this patent
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Abstract
A pump diagnostic system and method comprising current sensing probes clamped on electrical motor leads of a pump for sensing only current signals on incoming motor power, a signal processor having a means for buffering and anti-aliasing current signals into a pump motor current signal, and a computer having a means for analyzing, displaying, and reporting motor current signatures from the motor current signal to determine pump health using integrated motor and pump diagnostic parameters.
Claims29
A pump diagnostic system comprising:
- current sensing probes, exclusive of voltage probes, removably disposed on electrical motor leads of a pump for sensing only current signals on incoming motor power,
- a signal processor having means for buffering and anti-aliasing said current signals into a pump motor current signal, and
- a computer having a means for analyzing, displaying, and reporting motor current signatures from said motor current signal to determine pump health using integrated motor and pump diagnostic parameters, and
- wherein said pump health is determined by normalizing at least nine motor and pump diagnostic parameters using predetermined threshold magnitudes for each parameter to calculate an overall motor condition, wherein, said diagnostic parameters include overall shorted turns magnitude, overall static eccentricity magnitude (rotor bar based), overall dynamic eccentricity magnitude (rotor bar based), overall dynamic eccentricity magnitude (motor speed sideband based), overall rotor winding asymmetry magnitude (slip-poles sideband based), demo slip-poles peak, demo 1×ms peak, demo 3×ms peak, and demo 5×ms peak.
1 more element
A method of determining pump system health comprising the steps of:
- sensing only current signals, exclusive of voltage signals, on incoming motor power leads using current probes,
- processing said current signals into a pump motor current signal using a signal processor having a means for buffering and anti-aliasing, and
- determining pump system health from integrated motor and pump diagnostic parameters using a computer having a means for analyzing, displaying, and reporting motor current signatures wherein said pump health is determined by normalizing at least nine motor and pump diagnostic parameters using predetermined threshold magnitudes for each parameter to calculate an overall motor condition, wherein, said diagnostic parameters include overall shorted turns magnitude, overall static eccentricity magnitude (rotor bar based), overall dynamic eccentricity magnitude (rotor bar based), overall dynamic eccentricity magnitude (motor speed sideband based), overall rotor winding asymmetry magnitude (slip-poles sideband based), demo slip-poles peak, demo 1×ms peak, demo 3×ms peak, and demo 5×ms peak.
Dependencies are inferred from the claim text.