For making the calculation easy the resistance of the transformer can be transferred to the either side. The motor was running freely with no other apparent problems. To derive the winding resistance from the multimeter reading, following formulae will help you: For a delta connected motor, winding resistance = 1.5xmultimeter reading. yes, i see so because inductive resistance is between the magnetic forces of the rotor and stator. You are using an out of date browser. It may not display this or other websites correctly. Further, pleas give the diagram for the How to identify the … For a better experience, please enable JavaScript in your browser before proceeding. The current is simply the kVA divided by the voltage. phase values for a BLDC motor. The power taken by a circuit (single or three phase) is measured in watts W (or kW). i have a 3 phase/415v motor which is 11kw - 15kw, 15A - 28A depending what voltage is applied in either star or delta. You can investigate three-phase integer-slot, fractional-slot and concentrated windings, both with single and double winding layers where appropriate. Often it is required to test the winding of the 3 phase windings with the aid of a multimeter or ohmmeter to determine whether the motor is still good or burnt or shorted. The motor I believe is wired in star , and the meter used was the Fluke Insulation resistance tester which has a low resistance range. It had winding readings as follow : 4.02 / 2.62 / 3.18 ohms . Exactly the same is true of a transformer - the DC resistance of a winding will be much lower than V/I. 3) Impedance. The reading of the motor winding machine can be displayed on the multimeter screen that is resistance in ohms. Minimum insulation resistance of the winding to ground is measured with 500 V DC. With the help of Ohm meter, detach the power supply from the motor. The volts of the motor … load is mainly inductive. You must find the same resistance between the three leads that power is applied to the motor. If we observe the reading like zero, and a short among phases occurs. The recommended measurements are: 1) Resistance. The most common failure mode of a 3 phase AC motor is burnt winding or shorted winding leading to the damage of the motor. I know the resistance readings should be closer together. Which is why I thought it would be nice if the resistance could be roughly calculated. In the motor nameplate, the company provides the motor is 15 KW 3 phase induction motor. Excessive differences in resistance readings between phases may indicate a possible problem inside the motor. JavaScript is disabled. Regardless of the configuration, the resistance measurements are normally made phase-to-phase and the readings are compared with each other to determine if they are acceptable. Measure resistance for each winding, resistance between two different winding and resistance between winding and motors frame. Capital omega is the symbol for the resistance unit ohm. Discuss 3 phase motor current calculation - from winding resistance in the Commercial Electrical Advice area at ElectriciansForums.net, Reply to 3 phase motor current calculation - from winding resistance in the Commercial Electrical Advice area at ElectriciansForums.net. A number of standards provide maximum deviation percentages but typical limits are 1 to 3% between the mean average for the three windings. This calculator is based on simple Ohm’s Law.As we have already shared Ohm’s Law (P,I,V,R) Calculator In which you can also calculate three phase current. Winding resistance test of the motor. For a better experience, please enable JavaScript in your browser before proceeding. I want to find out the resistance and the reactance of an motor coil. Tile Adhesive and Tool Advice UK TilingForums.co.uk. Set the voltage setting of the insulation resistance tester to 500V. the value of 8 ohm was what you got testing across both windings! You've got impedance (inductance + resistance) in the coils which is a bit more difficult to measure. For example, If the voltage across the coil is 230v ac and the current through the coil is 10A, Impedance, Z= 230/10 = 23 ohm. However, this answer was given assuming the motor is wire wound. Given the kW and power factor the kVA can be easily worked out. For a dc motor measure the resistance between the 2 armature wires. So I was convinced it was a winding issue . He did manage to record some current readings of : 5.1 / 5.6 / 6.1 Amps. Brushless dc motors (BLDC) are 3 phase synchronous motors used in a configuration to be treated as dc drives. For delta connected three-phase winding, the resistance per phase would be 0.67 times of measured resistance between two line terminals of the transformer. The reading that appears on the multimeter screen is the resistance in ohms. 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 level of the insulation resistance tester to 500V. you can't measure this with an ohm meter or multimeter. i would say the winding resistance of a 15kw motor would be close to zero while on small motors you would get much higher, if checking look for 3 very similar readings. There must be absolutely no connection (infinite resistance) between the leads and the ground The measured resistance must be 2/3 the resistance of the coils. measured the winding resistance which is 0.55ohms between the 3 phases. 4) Phase Angle Maximum insulation resistance should be measured with 500 V DC with the windings at a operating temperature of … MOTOR RESISTANCE For the winding resistance use an ohmmeter.
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