Only use this as a rule of thumb.
Electric motor winding ohms.
Place meter on ohms and generally the range can be expected from 3 to 2 ohms.
When an electric current flows though the wire a magnetic field is induced inside the coil of wire.
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This magnetic field causes a metal bar inside the coil to rotate and power the motor.
The most common failure mode of a 3 phase ac motor is burnt winding or shorted winding leading to the damage of the motor.
Testing for open or short in windings using ohm meter.
If we observe the reading like zero and a short among phases occurs.
The electric motor winding definition is.
Put meter on ohms.
Most repair shops will use a megger or a ground insulation tester.
For phase to phase terminals u to v v to w w to u test the motor winding resistance or ohm reading using a multimeter or ohmmeter.
Generally if it is open then it will be above 2k ohms or infinite.
If there is any reading on any of these then the motor is bad do not use it.
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Keep the multi meter set for 30 000 ohms and touch one test lead to one terminal and the other to another terminal.
Know that the three steps have identical or almost identical windings.
Disconnect all power from machine.
Ac motor winding resistance test.
T1 to t2 t2 to t3 t1 to t3 the range usually expected is 3 to 2 0 ohms though most are about 8ohms.
When a bad motor winding cannot be found by a physical inspection many times an ohmmeter may show that there is a defective winding.
You may find that when it runs ungrounded that the casing becomes live at up to supply voltage.
With a multimeter set to low ohms usually 200 test between each winding terminal and the metal casing of the motor.
Just beware that from 230meg to 600meg often shows some deterioration in the cables or motor insulation.
Regular checks of motor insulation resistance the key to prolonging the life of any electrical device is periodic checks maintenance the insulation resistance of stored and active motors should be checked regularly.
The reading ohms for each winding should be the same or almost identical.
An electrical induction motor contains windings or wire wrapped around a cylindrical shaft.
The megger will help to detect areas of deteriorating insulation where the windings may soon short.
A if the insulation resistance of a new cleaned or repaired motor that has been stored for some time is less then 10 mω the reason might be that the windings are humid and.
With the help of ohm meter detach the power supply from the motor.
Each of the sets of windings should read about the same ohms value.
