Sites: GlobalSpec.com | GlobalSpec Electronics | CR4 | Electronics360
Login | Register
The Engineer's Place for News and Discussion®

Previous in Forum: omnipure 12 high temp alarm wont reset?   Next in Forum: cummins coolant temperature sensor
Close

Comments Format:






Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







4 comments
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

__________________
jayesh b sathwara
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Commentator

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

Register to Reply Score 1 for Good Answer
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.

Register to Reply
2
Commentator

Join Date: Dec 2009
Location: Mangalore, India
Posts: 65
Good Answers: 3
#3
In reply to #2

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.

Register to Reply Good Answer (Score 2)
Anonymous Poster
#4
In reply to #2

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

Register to Reply Off Topic (Score 5)
Register to Reply 4 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); Electronaut (2); mondster (1)

Previous in Forum: omnipure 12 high temp alarm wont reset?   Next in Forum: cummins coolant temperature sensor
You might be interested in: Induction Heaters, Motor Test Equipment, Motor Repair Services