3 PHASE INDUCTION MOTOR WINDING CHECKING
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- เผยแพร่เมื่อ 18 มี.ค. 2022
- #motor,#winding,#windingcheck, #shorts
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How To Test Three - Phase AC Motors
The basic steps in ascertaining the health of a three-phase AC motor are given below:
(a) General Inspections
(b) Earth Continuity and Resistance Test
(c) Power Supply Test
(d) AC Motor Winding Continuity Test
(e) AC Motor Winding Resistance Test
(f) Insulation Resistance Test
(g) Running Amps Test
General Inspections
For the three-phase motor, do the following:
(1) Check the appearance of the motor. Check for burnt, damage to body or cooling fan or shaft.
(2) Manually rotate motor shaft to examine bearing condition. Look out for smooth and free shaft rotation. If shaft rotation is free and smooth, bearing is possibly in good condition, otherwise consider replacing, repair or carry out further diagnosis.
(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. Examine the name plate thoroughly and compare values of running amps test (see below) with name plate value
Earth Continuity and Resistance Test
With a multimeter, measure the resistance between motor frame (body) and earth. A good motor should read less than 0.5 ohms. Any value greater 0.5 ohms indicate trouble with the motor. Further troubleshooting maybe required
Power Supply Test
For 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. Check that the correct voltage is applied to the motor using a multimeter. Ensure the terminal for power supply is in good condition. Check the connection bar for terminal (U, V, and W). For three phase motors, connection type is either Star (Y) or Delta
AC Motor Winding Continuity Test
Using a multimeter, 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. If any particular phase fails the continuity test, your motor is probably burnt.
Please see how to identify three phase windings for proper winding identification. U, V, W is a European winding designation.
AC Motor Winding Resistance Test
Check the motor winding resistance or ohms reading using a multimeter 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). Remember that the three phases have identical windings or nearly so!
Insulation Resistance Test
Insulation resistance failure of an electric motor is one of the first signs that the motor is about to fail. 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. Set the voltage setting of the insulation resistance tester to 500V. Check from phase to phase (U to V, V to W, W to U). Check from phase to motor frame (earth) (U to E, V to E , W to E ). Minimum test value of motor insulation resistance is 1 Meg Ohm (1 MΩ). See how to measure insulation resistance of Electric Motor
Running Amps Test
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. Deviations from rated FLA could signify problems with the motor under test
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Bro before checking insulation or resistance first we need to disconnect the power supply connections na?
Good explanation thankyou bro!
Nice video. Hello bro. How about if the winding w1 and u1 have a continuity? So is that mean the the winding is shorted?
Good explanation Brother 👍🤝
Good explanation
Super BRO 👌
Thankyou sir,superexplain
சூப்பர் 👌👌👌👌👌👌👌
Thankyoubro
Super anna
Thank u sir
Super
Bro minimum and maximum resistance value and evlo irrutha motor healthy ha irruku.
Thanks
What will be ohm value of 10HP Induction Motor
Cable remove panna vendama
Bro content super ah iruku, keep it up bro
Ok
What will be (i) Phase Voltage (ii) Line Voltage (iii) Phase Current (iv) Line Current in Star-Delta Starter with respect to 10HP Induction Motor
It was informative thank you very much brother ( Kerala)
Why you were mentioned Kerala?
It means, you are dangerous fellow.
Thank you so much Anna ❤❤❤❤ tamil sollikudathuku ❤❤
WhatsApp group iruka bro
chat.whatsapp.com/JlhNvO6YwJ3EnjUagJKXkd
Why upto 15 Hp motor winding resistance check not use Multimeter
3 terminal mattum tha irukku athuku eppadi check pantrathu
English, please
Motor run aguthu load eadukumpothu starter trip aguthu
Bro Induction Motor insulation weak ah irundalum load Edukkadha
Yes...
Short circuit will happen...
What
Bearing good condition la iruka IlA bad condition la iruka nu eapadi kantu pedikanum
Thanks