How to Repair Damage Motors?- americanelectricmotors.com

1. How to Repair Damage Motors?- americanelectricmotors.com When demag motor presents a fault, the decision to repair or replace damagemotors goes through a series of considerations. When evaluating whether to repair or replace an electric motor that has failed, it must be taken into accounts that, in general, there are three types of electric motors: i) General Purpose, which manufacturers keep in stock and can be delivered immediately, even offering quick modifications to add certain accessories. ii) Those that use Original Equipment Manufacturers (OEM) and that have special design, generally protected. iii) Those of Special Manufacture, made to the extent of the application, which are not kept in stock, and with extended delivery times. We consider following points for repair or replace of electric motor: Laminated core analysis Assuming the engine can be repaired or replaced, the baseline analysis (or initial cost approach) is for repairing the engine to its original specifications. One of the most used considerations is the cost of the repair and, as a general rule, it is said that when the repair exceeds 65-70% of the new engine of superior efficiency, it is suggested to place a new one. However, the decision does not only go through the cost of repair. There are other factors; for example the impact on efficiency. It should be considered that in the repair process heat is used to soften the windings for the extraction of the stator. The use of a controlled temperature will avoid possible damages in the inter-laminar insulation of the iron core, so that the increase in magnetic losses does not occur. Therefore, it is recommended to perform tests on the laminated core before following a rewinding process of demag. These tests are known as the Core Loss Test, which establishes the maximum recommended level of losses in W / kg; if this level is exceeded, it is suggested not to repair the engine and proceed with the change. But, if the engine is not in stock, and there is no functional spare, it must be repaired or replaced. Visit americanelectricmotors.com for die seperator repairs jobs. Model for decision making The process includes a comparison between the total costs, analyzing different scenarios in terms of replacing or repairing of demag motors. A model based on the relative cost difference between at least two scenarios is suggested, which quantifies the benefits of motor repair actions, or substitution. In this sense, the model must consider the following factors: • Cost of purchase / repair cost. • The efficiency of the replacement electric motor. • The efficiency (estimated or calculated) of the current engine.

2. • The electricity tariff and its annual increase. • The daily hours of operation of the engine and possible future modifications. • The average load of the engine and possible future modifications. • The (remaining) estimated technical useful life of Electric motors. • The cost of engine or electric motor downtime (unscheduled stops). • The resale value of the engine (if possible) or the sale value as waste. The cost analysis must also contemplate the cost of repair, transportation, assembly and commissioning, die separator repair among other factors.