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When testing a motor winding for resistance, the following measurements are recorded Winding resistance measurements are used to find open windings, shorts to ground, wrong turn count, wrong wire gauge, resistive connections, round wires in hand that are not connected in a coil, some connection mistakes, the resistance balance between phases, and in some cases shorted turns. Common to run 4 ohms, common to start 6.2 ohms, run to start 10.2 ohms, common to ground 20.4
These recorded measurements indicate a C to r indicates the resistance between the capacitor terminal and the run winding. 4 ohms + 6.2 ohms = 10.2 ohms (which matches the recorded value) this indicates that the motor winding is in a good condition, as the resistances between the different points follow the expected relationship.
One critical aspect of motor maintenance is monitoring the winding resistance of the motor
Accurate resistance measurements can reveal underlying issues such as insulation degradation, short circuits, or open windings, which, if left unchecked, can lead to motor failure. The motor testing readings indicate a ground fault since there is resistance between the common winding and ground The continuity between the windings shows they are intact, ruling out short or open circuits. Winding resistance is typically determined by measuring the voltage and current in the motor
The resistance is then calculated using ohm’s law, which states that resistance is equal to voltage divided by current. Guidelines for measuring winding resistance and insulation resistance, including acceptable insulation resistance values based on motor voltage according to ieee 43 standards. It provides the best possible measurement results since it ensures that the resistance of the connecting current cables is not included in the measurement. When testing a motor with an ohmmeter, the following measurements are recorded, common to run 4 ohms, common to start 6.2 ohms, run to start 10.2 ohms, and common to ground 20.4
Let's first list down the given measurements for the motor's terminals
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