Ac Motor Rewind

By Author: Jared Olson
Total Articles: 2
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When we consider ac motor repair, it normally includes restorationand upgrading of the motors, including its insulation system. The motors range from 1¼ to 6000 hp, and go through a wide range of tests to find out their flaws and before proceeding to conclude at a predictive maintenance formula for their rebuilding, before pressing them back into service.| Among the different tests administered for electric motor rewind evaluation are: Vibration analysis, Motor Circuit Evaluation (MCE)., polarization index profile (PIP), hipot, surge, growler, core loss and bearing insulation.Also, rewinding, repair and re-manufacturing are made for motors with high HP. Preventive and prognostic maintenance augmentation, rotating spares, inventory improvements, better tools, shop planning,specific training and proper implementation of a new computerized maintenance program are done as maintenance plan for the older units in order to improve their dependability. Good and wide-ranging workshops also work on rewinding, ...
... repair and re-manufacturing of large generators. Knowledge of the maintenance department is important in knowing the different causes of failure and use new and updated technologies for collecting data to start the condition assessment process.Refurbishment The cycle of restoration followed for almost all of the project motors followed this order:Disengaging the motor from the plantTransportation to assigned restoration facility Documenting of nameplate and other descriptive data visible without disassemblyTesting resistance-to-ground to guarantee safe value for energizing motor in the shopRunning motor on test stand for warming up and vibration analysis| Vibration analysis after running motor on test stand to warm up.} Off-line, low voltage Motor Circuit Evaluation (MCE) tests conducted Disasemble, visual inspection and recording of conditions and other characteristics observed (such as kindof bearings used and number of rotor bars).Cleaning and drying of components and carrying out after cleaning search for mechanical flawsCarrying of core loss, hipot, growler, surge, and bearing insulation tests depending on the size and type of motor to be renovated Depending on the size and kind of motor to be renovated, carrying of core loss, hipot, growler, surge and bearing insulation testsAppointing leader and shop supervisor for any out-of-scope repairs and modifications to be madeMaking authorized mechanical and electrical repairs, modifications, and restorations (including dip or over-spray and cure winding insulation)Balancing dynamically of rotating elements and motor reassembly.Installation of new or other nameplate with the latest motor characteristic informationPerforming post renovation shop tests (motor circuit analysis and vibration analysis) Transport of motor to plant and reinstallingConduct Post installation tests such as baseline tests, MCE test after making electrical connections and prior to connecting it, vibration test and on-line electrical study right after start up.Making follow-up adjustments as needed, like correcting any after installation circuit resistance, imbalance and adjustment of mechanical alignments, the most frequent post installation problem.Corrosion removal- Needs sand blasting and rods for cleaning the interior of cooling channel. Balancing before assembly - Preceding reassembly of the motors, all rotating elements should be dynamically balanced. Reassembly - Replacement of sleeve bearings and shaft sleeves showing any tainted condition and all roller bearings. Shop Test - Motors ran closest to normal operating voltage while checking for vibrations. Rotor influence check (RIC) - It is performed as a quality test for the reassembly and used as a baseline for future. Test after installation - Final MCE tests to ensure balance of inductance and resistance of the complete circuit based on wanted values of resistance-to-ground and capacitance-to-ground, after connecting each motor to its electrical circuit but before energizing it for the first time.Magnetech Industrial Services provides complete generator and DC Motor Repair, reconditioning, and remanufacturing. We service all makes and models of AC and DC motors and generators and also offer diagnostics and field services including comprehensive preventative maintenance and 24/7 emergency service. Our in-house engineering team provides performance verification and analysis, motor redesign, and UL re-rating. We specialize in solving your equipment issues - on time, to specification, and within budget.