How to calculate the motor winding resistance ?
Answers were Sorted based on User's Feedback
Answer / dharmendra raninga
Please give the answer of this que.
Is This Answer Correct ? | 99 Yes | 55 No |
Answer / m.ramesh
how to calculate the motor winding resistance
Is This Answer Correct ? | 16 Yes | 6 No |
Answer / manik shinde
first apply the reted voltage & current then once we know
the v & I by voltmeter & ammeter, calculate resistance by
R=V/I.
Is This Answer Correct ? | 91 Yes | 83 No |
Answer / mike
you can find the resistane by using ohms law but that only
applies to a resistive load. ie.,electric heaters. for an
inductive load you'll have to call manufacture or use an
ohm meter. on a three phase motor the resistance on all
three legs should read the same or very close and on a
single phase the run and common should equal up to what
your start winding ohms are
Is This Answer Correct ? | 13 Yes | 5 No |
Answer / myo
The static resistance for the stator you can simply connect
the multimeter between 2 phases and arrive at the phase
resistance. Usually motors windings are delta connected. You
multimeter reading is 2/3x phase resistance.As for the rotor a
squirrel gauge motor has no rotor windings and slip ring
motors have windings connected to slip rings. In the second
case apply the same principle if you know whether the
windings are star or delta connected. For complete
determination of the equivalent equivalent circuit conduct the
no-load and blocked rotor tests.
Is This Answer Correct ? | 33 Yes | 27 No |
Answer / gunasekaran
first we have calculate the efficiency.
then we calculate the core loss.
loss is Isqr*R
we know load current and loss then we can calculate the wdg
resistance of the motor this is app.method not correct.
for transformer also same like that.
we can get the loss and efficiency of the motor from
manufacturer.
Is This Answer Correct ? | 22 Yes | 16 No |
Answer / ashour ghareeb
dc motor has four wire tow for field and other for armature
CONNECT OHMMETER,SLOWLY MOVE THE ROTOR,
IF READING IS FIXED,IT WILL BE FOR FIELD
IF NOT FIX,IT WILL BE FOR ARMATURE
SERIES-WOUND motor resistance is:
ARM.RESISTANCE
~100 Ω
FIELD RES.
~1 Ω
Is This Answer Correct ? | 5 Yes | 3 No |
Answer / ramesh ravichandran
in case you want to calculate induction motor winding resistance..
to get accurate value of DC resistance, firstly do block rotor test so winding of the motor get heated up at rated current..
immediately remove AC supply lines and connect DC lines across any two phase and apply 50 percent of the rated current of the IM to get the accurate DC resistance
convert the DC resistance into AC resistance by a factor of 1.2..
Is This Answer Correct ? | 5 Yes | 5 No |
Answer / muhammad kamran
although ohm-meter test is thorough enough but its not
complete...to find true result 1st ohm-meter reading is
taken and then in 2nd step a low voltage ac signal is
applied (using step-down transformer)normally 6:1 of
original operating voltage both voltage and current is
taken and Z-l(total impedence is taken) as unit is
performing in ac region not dc while ohm meter is dc
test.... why use this test?
not always the clear result is given by ohm meter test. a
winding may show balance state by ohm-meter but any
irregularity can be detected by AC-impedence test to be sure
Is This Answer Correct ? | 14 Yes | 15 No |
what is the diff.between neutral and earth?
Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1. H1-H2 = H2-H3 H3-H1 2. H2-H3 = H3-H1 H1-H2 3. H3-H1 = H1-H2 H2-H3 For the LV side also: 4. X1-X0 = X2-X0 X3-X0 5. X2-X0 = X3-X0 X1-X0 6. X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0 H2-H0 H3-H0 X0-X1 X0-X2 X0-X3 128.0 119.9 7.2 29.2 13.3 15.8 70.7 128.4 59.2 23.4 22.0 3.6 7.2 120.1 128.1 13.4 29.3 15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?
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