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What meter is used to bench test a motor for a short or an open winding?
Wiki User
∙ 8y ago
An Ohmmeter or the ohms function on a typical multimeter would be used to bench test a motor for a short or an open winding. First, be absolutely certain that the motor under test is disconnected from any mains. Using a low ohms scale, x1 or x10, one would expect to see some resistance across the motor. The resistance can be quite low depending on the size of the motor, but should not be zero. If it is a motor that has brushes and a commutator, rotate the shaft, with the meter connected, through a full revolution. This rotation could help identify a single defective winding in the rotor. To check the stator, remove one of the brushes so that the measurement current only passes through those windings. Of course, it would help if you have a known good motor of the same kind so that you can compare the readings.
Wiki User
∙ 8y ago
Wiki User
∙ 9y agoIf by using the word "test" it is meant to establish the condition of the motor in an operative state, then there are a couple of things that can be done. The very first thing is to measure the amperage that the motor is drawing and compare that value to what the manufacturer recommends on the motor's nameplate. The second and important thing to do is establish the condition of the motors windings to ground. This is done with a megger. Continuous readings over the life time of the motor will show a continuous degrading of the insulation capacity of the motor' internal windings. When the readings get low enough, at some point in time the decision has to be made as to whether it is time to replace the motor before the windings short circuit and there is a total motor failure. In large industrial installations this type of preventative maintenance prevents production line shut downs.
On the whole megger testing is non destructive. What happens is a DC voltage is applied to the device or winding under test. It is an insulation test to see is the insulation has been injured in any way to cause a short circuit when normal power is applied to it. On my megger there are 3 ranges 300 V, 750 V, and 1000 volts. Applying the proper voltage is essential to not damaging the device you are testing. Working voltages up to 240 volts should use the 300 range. Working voltages up to 600 volts use the 750 volt range and working voltages above 600 use the 1000 volt range. As you can see if you used the 1000 volt range on a device that had a working voltage of say 24 volts you could damage the insulation just by testing it. So meggering a device is non destructive if you use the tester as its instructions tell you to.
Wiki User
∙ 9y agoI would use an Ohm-meter for this, or the ohmeter part of my digital multi-meter.
Wiki User
∙ 8y agoA megger falls into this category of test equipment.
Wiki User
∙ 8y agoOhm meter.
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Why you do insulation resistance test?
in order to avoid unwanted short circuit break downs.... short circuit can burn the transformer and motor winding.... Megger is the device used to check the insulation .
How winding is connected to stator in ac motor?
in 3 phase motor u1,v1,w1 give to the short terminal and remaining v2,u2,w2 give t0 the in coming power supply of 440v
How do you check 110volt motor for short?
To check any piece of electrical equipment for a short circuit a megohm meter will be used. The common name for this piece of equipment is a megger.
What is a Winding Short Circuit?
When 2 turns of an inductor or transformer short together.
Why is ceiling fan overheating?
Overheating is a symptom of too much current. There may be a short in the winding of the fan motor across windings that effectively reduces the resistance, but the fan could still work.
What meter is used to bench check a motor for short or open winding?
Ohmmeter
Why induction motor is also called short circuit transformer?
Like transformer induction motor has stator winding(Primary winding) and rotor winding(Secondary winding) separated by an airgap.Rotor winding(generally Al bars) are short circuited at the end to produce torque for the rotation.Hence the name short circuited transformer.
How do you check a motor for a bad winding?
You need a Megger tester. With one lead attached to the winding and the other attached to the motor housing, the Megger sends a high voltage through the winding. The Megger reads the resistance, letting you know if there is a short to ground.
When will a synchornous motor acts as an induction motor?
If there is an extra winding called the "damper winding" in addition to the field winding.Then the synchronous motor will operate as a squirrel cage induction motor.Whats is a damper winding ?A damper winding is made up of copper bars which are placed in the slots in the pole faces of the rotor.These are short circuited with the help of end rings in a squirrel cage induction motor.
What are the uses of damper winding s in synchronous motor?
to achive constant speed and provide a eassy way to inter loacking with syn fluxDamper winding is a short circuited winding which are useful in preventing the hunting(momentary) speed fluctuation in alternator and are needed in synchronous motor to provide starting torque.
Is winding a short I or long I?
There are two "i" in the word "winding". The first is long. The second is short.
What is induction motor in physics?
An induction motor consists of a rotor winding and stator winding. Rotor windings are short circuited and stator winding are given electrical AC supply .Now lets do the physics behind it . As the current starts to flow in the stator winding , magnetic flux start to produce around it . due to it's alternating nature that flux varies and according to farady law emf is induced in the rotor winding .Since the rotor winding is short circuited the current circulates in it .And when a current carrying conductor is placed in magnetic field it experiances a force and hence if start to rotate.
What is the reason for the insulation failure of a single winding of a motor and all 3 phase windings of an immersible pump?
The insulation on wires of a motor are very thin and in close proximity in the winding. If too much current flows the wire can heat up and insulation can melt. This deterioration can happen over time. The bare wire can then come in contact with metal parts on the motor and cause a direct short or can short with other parts of the winding and cause a short that effectively reduces the length of the winding. This can happen in both cases you asked about. On an immersible pump if you are demanding a heavier duty cycle on the pump it can fail prematurely. This can happen if your pressure tank on a well is not of sufficient size to handle your water demands.
Working principle of ac motors?
Michael Faradeys laws of electromagnetic induction:When a current is passed through stator winding, an alternating flux created on the stator winding which in turn cuts a rotor winding(wire wound motor)/short circuited copper bar(squirrel cage motor), then a current flows through it and as above one motors works.
Why you do insulation resistance test?
in order to avoid unwanted short circuit break downs.... short circuit can burn the transformer and motor winding.... Megger is the device used to check the insulation .
DifferEnces of long vs short shunt DC COMPOUND MOTORS?
the basic difference is ,in short shunt motor the series field winding wont carry any current under no load condition whereas in long shunt motors series winding will carry no load current.....
What happens if you short the shunt windings of a motor?
Answer:If the shunt winding is open the motor won't start, but if the shunt open while the motor is running, the motor will keep on running as if nothing went wrong, except if the wire of the winding get maniacally between the stator and the fields the motor can be damaged beyond repair. But normally the shunt windings is done with very thick conductors, so the chance that the shunt will go open is zero.
