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 Heat
and fatigue, associated with excessive motor
starts or overloading, can lead to broken rotor
bars in electric motors. Broken rotor bars
eventually lead to motor failure, and can cause
secondary damage to stator windings. Rotor bar damage can be difficult to detect in a vibration signature. Emerson's CSI MotorView technology, with embedded analysis expertise, helps complete a total Machinery Health Management program by diagnosing electrical problems that may be missed with a vibration monitoring program alone. Motor current analysis provides information on rotor-related electrical faults such as broken rotor bars, high-resistance joints, voids in aluminum cast rotors, and cracked rotor end rings in squirrel-cage induction motors.In addition to motor current analysis, Emerson's motor monitoring tools also include motor flux analysis. Monitoring the magnetic flux field of the motor provides the safety and convenience of not having to open motor control cabinets to access electrical wiring directly, and provides detection of additional electrical problems related to the motor stator that are not found in the current signature. Temperature measurements also play an important role in the overall motor condition analysis and are incorporated into the automated analysis.
The tools associated with MotorView are non-intrusive and perform motor current analysis, motor flux analysis and temperature measurements while motors remain online.
Motor signature data are transferred to the AMS® Suite: Machinery Health Manager MotorView module for automated expert analysis, trending, comparison with results from other diagnostic technologies, and implementation of corrective actions.
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