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MOTOR WINDING RESISTANCE VALUE




 * #Motor winding resistance value how to#


A permanent connection is when the motor is connected in either Star or Delta,
and this connection is not supposed to changed during the operation of the
motor. The answer is simple: To easily bridge a permanent connection. You may
now wonder, why the coils are connected in cross-pattern and not vertically.
Instead, the pairs are in cross-pattern like this: It sounds logical to separate
these 3 pairs in a vertical pattern, but that's not the way it goes. Since each
coil has 2 endings, it is easy to understand that these six leads can be
separated in three pairs, and each pair is connected to one coil. Here is a
photo from a typical electrical connection box:Īs you can see, there are indeed
six leads arranged in two rows. First of all, you need to understand how the
coils are connected with the six motor leads that exist in the electrical
connection box.

Two or more coils short-circuited with each other (current leaking from one coil
to another coil)Īll of the above problems can be detected with a simple
Ohm-meter. Leaking coil to ground (current leaking from one coil to
ground/neutral). Short-circuited coil (less than normal or zero coil
resistance). There are basically 4 problems that the motor windings can suffer
from:




#MOTOR WINDING RESISTANCE VALUE HOW TO#

If someone works with AC 3-phase motors, then it is important to know how to
connect these motors in Star and Delta connection, and how to detect an
electrical problem. It is called squirrel-cage, because it's rotor looks like
the exercising wheel found in squirrel or hamster cages.Ī typical 3-phase
squirrel-cage motor has six connection leads in the electrical connection box
for the three coils. The most common type though is the -so called- squirrel
cage rotor. General Repair Info.The rotor of a squirrel-cage motorThere are
several different AC motor types, each one with different operating and
mechanical characteristics. Fanuc Servo Motorsįanuc Servo Motor Repair -
Technical Specifications TigerTek offers superfast nationwide servo motor repair
service - expert repairs with OEM parts and a One Year Warranty! Order servo
motor repair from TigerTek if the problem is with the motor. This will clue you
as to whether the problem is with the cable or with the motor. Problem? Go back
to the motor and disconnect the cable (isolate the motor). (More exact values
will be specified by the manufacturer it will also depend on the working
environment - corrosive, damp - and the type of motor enclosure). Between each
conductor and ground, the megger value should be relatively high: 100 Kohms or
above. Between the cables, it should give nearly the same value, (1-3 ohms for
medium rated motors, higher for smaller motors). Next, check the motor at the
winding terminals rather than the cable end (in case the cable is old or
corroded or the insulation is defective).ĭisconnect the conductors from the
drive control end, and megger (Megometer) between cables and each cable to
ground (The megger uses much higher voltages to check resistance than a normal
Volt-ohm meter). This should be about 200 ohms, give or take: Larger motors
could have a lower ohm value whereas smaller motors could have an ohm value
around 100. Then find the winding resistance by connecting between the
terminals.This should be approximately 100 kohms or above Using a multimeter,
check the ground resistance between the motor body and the motor terminals.There
are a couple of things you could do to check it first. You're probably wondering
if the A/C servo motor is going bad but you don't want to remove it from the
mount to test it.

Please extend my sincere appreciation to all involved. The quick response and
"round-the-clock" efforts were very much appreciated and proved yet again that
TigerTek can be counted on in an emergency. I wanted to thank you and the
TigerTek team for all your efforts this past week-end.


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