This creates a safety issue since it provides a path for the supply voltage from the winding to extend to the frame or other exposed parts of the machine.
MOTOR WINDING RESISTANCE VALUES HOW TO
How to Test Groundwall InsulationĪ ground fault or a short to ground occurs when the resistance value of the ground wall insulation decreases and allows the current to flow to ground or an exposed part of the machine. Knowing how to check your windings will allow your team to be proactive and take the appropriate action to prevent unwanted motor failure.
Since most insulation failure occurs over time, MCA technology provides the measurements required to identify these small changes that determine the condition of the winding insulation system. The sudden failure of any part of the motor will cause loss of production, increased maintenance expense, loss, or damage to capital and possibly personal injury. These changes cannot be detected visually, or even with traditional electrical testing instruments like ohmmeters or megohmmeters. The polymer material is organic in its chemical composition and is subject to change due to aging, carbonization, heat, or other adverse conditions that cause a chemical composition of polymer material to change. When motor windings fail it’s very seldom that the actual conductors fail, rather it is the polymer coating (insulation) surrounding the conductors that fail. Like any other part of the motor, the winding can fail. Motor windings are conductive wires wrapped around a magnetic core they provide a path for current to flow to create then magnetic field to spin the rotor.
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