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Active Contributor

Join Date: Jan 2010
Location: Bharuch , Gujarat , India
Posts: 17

# Resistance value of 10HP , 3 phase , 415v , 50hz , induction motor

02/05/2010 8:02 PM

kindly send me a formula how can we get resistance value of 3 phase induction motor . also how can we check ? pls do need full from jayesh

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jayesh b sathwara
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Commentator

Join Date: Dec 2009
Location: Mangalore, India
Posts: 65
#1

### Re: Resistance value of 10HP , 3 phase , 415v , 50hz , induction motor

02/05/2010 10:12 PM

I don't have the formula for calculating the winding resistance of an induction motor. You can measure the winding resistance of the motor by using a multimeter. Connect the multimeter across the TB terminals without disconnecting the motor leads. To derive the winding resistance from the multimeter reading, following formulae will help you:

For a delta connected motor, winding resistance = 1.5xmultimeter reading.

For a star connected motor with 3 leads brought out in the TB, winding resistance = 0.5xmultimeter reading.

For a star connected motor with 6 leads brought out in the TB, winding resistance = multimeter reading. (multimeter connected between phase and neutral)

Member

Join Date: Jan 2010
Posts: 7
#2

### Re: Resistance value of 10HP , 3 phase , 415v , 50hz , induction motor

02/06/2010 1:52 AM

to determine the resistance, you can do a DC test.. first, you select two terminals from three terminals that represent three phases. after that, you give the a certain DC voltages to the terminals you have selected. and then, using your multimeter, you can know the amount flows in the circuit. after you know the amount of the current, use this formula to determine the resistance of each phase: R = V/ (2*I) ohm the result of the calculation of the formula above will give you the amount of the resistance of each phase of the IM.

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Commentator

Join Date: Dec 2009
Location: Mangalore, India
Posts: 65
#3

### Re: Resistance value of 10HP , 3 phase , 415v , 50hz , induction motor

02/06/2010 2:39 AM

When you connect a multimeter (with selection for resistance measurement) across any element to measure resistance, what the multimeter does is the same thing that you have explained.

When you connect the multimeter to read resistance, the multimeter applies a fixed DC voltage across the test element and measures the current flowing. It displays the value of the resistance by computing the ratio of impressed voltage to the measured current.

Anonymous Poster
#4

### Re: Resistance value of 10HP , 3 phase , 415v , 50hz , induction motor

10/21/2010 1:39 AM

WE CAN TO GIVE DC VOLTS TO MOTOR BECAUSE MOTOR WILL BE BURN IN MORE CASES

Off Topic (Score 5)
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