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- MOTOR WINDING RESISTANCE TEST HOW TO
- MOTOR WINDING RESISTANCE TEST FULL
- MOTOR WINDING RESISTANCE TEST SERIES
- MOTOR WINDING RESISTANCE TEST FREE
Loops are either single or parallel conductors (wires), and can circle any number of times around the stack teeth (called turns in a coil). The winding continues to loop all the way around the armature in the same manner.
MOTOR WINDING RESISTANCE TEST SERIES
Basic Armature DesignĪn armature (pictured on right) has a continuous series of windings from each bar on the commutator, which loop around the iron stack teeth and connect to the next bar on the commutator. But first we must understand some basics of armature design. If you have access to a volt/ohm meter, there are three quick checks you can do that will tell you if a motor armature is functioning properly. Occasionally we get this question from our customers, “How can I do a quick check on my armature to see if it is ok?”
MOTOR WINDING RESISTANCE TEST HOW TO
Posted by: the video: how to check a motor armature. Deviations from rated FLA could signify problems with the motor under test.
MOTOR WINDING RESISTANCE TEST FULL
With the motor running, check the full load amps (FLA) with a suitable meter or preferably a clamp on meter and compare with the name plate FLA. See how to measure insulation resistance of Electric Motor Minimum test value of motor insulation resistance is 1 Meg Ohm (1 MΩ). Check from phase to motor frame (earth) (U to E, V to E, W to E ). Check from phase to phase (U to V, V to W, W to U). Set the voltage setting of the insulation resistance tester to 500V. For a three phase motor, insulation resistance is usually measured between each motor winding or phase and between each motor phase and motor frame (earth) using an insulation tester or megger. Insulation resistance failure of an electric motor is one of the first signs that the motor is about to fail. Remember that the three phases have identical windings or nearly so! Or ohmmeter for phase to phase terminal ( U to V,V to W ,W to U ).The ohms reading for each winding must be the same (or nearly the same). U, V, W is a European winding designation.Ĭheck the motor winding resistance or ohms reading using a multimeter
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Please see how to identify three phase windingsįor proper winding identification. If any particular phase fails the continuity test, your motor is probably burnt. , check the continuity of motor winding from phase to phase ( U to V, V to W, W to U ).Each phase to phase must have a continuity if winding is OK. For three phase motors, connection type is either Star (Y) or Delta Check the connection bar for terminal (U, V, and W). Ensure the terminal for power supply is in good condition. Check that the correct voltage is applied to the motor using a multimeter. Further troubleshooting maybe requiredįor three phase motors, the expected voltage for a 230/400V system is 230V phase to neutral and 400V between each of the three phase supply lines. Any value greater 0.5 ohms indicate trouble with the motor. A good motor should read less than 0.5 ohms. , measure the resistance between motor frame (body) and earth. Examine the name plate thoroughly and compare values of running amps test (see below) with name plate value (3) As with all testing and inspections, the motor name plate provides valuable information that will help to ascertain the true health of the motor.
MOTOR WINDING RESISTANCE TEST FREE
If shaft rotation is free and smooth, bearing is possibly in good condition, otherwise consider replacing, repair or carry out further diagnosis. Look out for smooth and free shaft rotation. (2) Manually rotate motor shaft to examine bearing condition. Check for burnt, damage to body or cooling fan or shaft.
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The basic steps in ascertaining the health of a three-phase AC motor are given below:įor the three-phase motor, do the following: