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How do you find the start and end of a 3 phase motor winding ie A1 A2?

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The two windings are in parallel with each other. Some motors have a capacitor placed between the two windings. Other connections find a switch between the two windings. When the motor gets up to speed, the switch opens and the start winding is taken out of the circuit and the motor runs on the run winding.


Just swapping the hot and neutral connections on a plain and simple single phase ac motor (one which was not designed to be reversible) is usually a waste of time as the voltage is alternating and the motor sees this as the same either way and it will still run in the same direction.For a DC motor which uses a permanent magnet to provide its magnetic field, simply switch the two power leads to make them run in the reverse direction.For a DC motor which has a wound field winding instead of a permanent magnet you have to reverse the connections either to the field winding or to the armature. (If you reverse the connections to both the field winding and the armature the direction won't change!)For a three phase motor simply switch any two of the three power leads to make it reverse.Another opinionTo change the direction in a single phase ac electric motor you must find a way to reverse the connections to the field magnet (outer windings) or to the armature or rotor (which is the center part that spins). Some motors are reversible and the run direction can be changed simply by swapping the 2 plugs sticking out of them that are connected to the field windings.All single phase ac motors can be reversed by physically reversing the field magnet or rotor ( front of motor is now the back) although this can be more difficult in motors with brushes because of the brush holder which is mounted at the front and usually has to stay in the front.>Changing motor rotationA split phase induction motor has two sets of coils and a centrifugal start switch. The start winding is in series with the start switch. The start winding provides a rotating magnetic field in one direction enabling the motor to start. The motor can be reversed by reversing the connections of either the start winding or the run winding but not both.


A person can find out motor winding, common start, and run connections through the use of operational manuals that came with a vehicle. Another source would be a repair manual specifically written for a certain make and year of automobile.


Normally there are six terminals (two terminals per winding in 3 phase system) for a motor. If you find 12 terminals, you need to read the motor name details or specifications to get more info. The motor could be with two different sets of winding (double speed motor)


No the motor should be rewound to operate on the new voltage. Depending on the size of the motor you might be able to find an auto transformer that you can use a primary winding of 380 and tap off secondary for 230 volts. On most occasions the transformer's price outweighs the price of a rewind.


The main drawback is that two-phase systems are archaic, and you are unlikely to find one with which to supply a two-phase motor.


You will need to install a phase converter or change the motor to single phase. You can find a licensed electrician at www.contraxtor.com


The motor cannot be altered to work on single phase power. You will either have to put in a new single phase motor or use a phase convertor box. Do a google search for phase convertor - you will find plenty.



1)may be voltmeter or clipon meter will be connected across the winding. 2)or in motor winding we must find amp current and aramture resistance nd then find the ratings 3)formula is rated kva of motor*1000/base kva for transmission line.


apply 3 phase voltage(415V) to the winding whose magnetising current is to be found and open circuit another winding. now measure current using tong tester or connecting an ammeter in series between supply and winding.



A three phase motor will not work on a 2-phase power supply, it needs a 3-phase power supply. Two phase electrical services are no longer the standard for electrical distribution. You would need to get an expensive phase-changer to convert your normal single phase power supply to three phase. Depending on the power output you require from the motor, it can often be much cheaper to buy a suitable single phase motor, new or secondhand, instead of buying a phase-changer as the power supply for a three phase motor. If you really do want use that three phase motor you may find it worthwhile to contact your electricity supplier first, to ask if they can install a three phase service for you to use and what the cost would be. Otherwise, after you have bought the expensive phase-changer unit, you may find out later that your electricity supplier could have upgraded your service to three phase for a lower cost!


No, a three phase motor cannot generally be wired to a single phase supply so, to run it on single phase you would need an electronic inverter unit or a rotary phase converter to generate the three phase supply. Such invertors or convertors are generally expensive to buy and the price will depend on the power of the motor.As long as the power requirements of the equipment that you want to use the motor on are not too high for the biggest single phase motor available, it is usually best to see if you can part-exchange the three phase motor for a suitable single phase motor.Another answerSome three phase motors have all their windings brought out to terminals, usually two terminals per winding. So, if the motor has at least six terminals inside its wiring connections box and you can find out for sure that it was designed to be rewirable to run on single phase as well as on three phase - from the manufacturer or a qualified electrical engineer - then you should be able to connect them to run the motor on a suitably sized single phase circuit.("Suitably sized" means that the circuit breaker and wiring is of the correct size to handle the current needed by the motor.)As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.Before you do any work yourself,on electrical circuits, equipment or appliances,always use a test meter to ensure the circuit is, in fact, de-energized.IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS..


To run any three phase equipment from a single phase source you will need something called a "phase converter" that can handle the full power of the motor. Phase convertors are very expensive so, before you go out and buy one, find out if a single phase motor is available to match your requirements. It will probably be an easier and cheaper solution for you if you can do that. If you already have a three phase motor that is in good condition, you may be able to find a local dealer who would part-exchange it - or even swap it - it for a good quality used single phase motor with a warranty. It is simply not worth destroying a perfectly good three phase motor! Converting or rewiring a three phase motor to run on single phase is not a simple job to do, nor is it worth doing, because the work required would cost a lot to do. It is simply not a practical proposition. That fact is true even for a professional electrical engineer who has all the right equipment to be able to do it.


If your three phase motor runs backward, you have two phases swapped. double check a, b and c phase to find which ones are misplaced.


(120 X hertz ) divded by the numbver of poles


First of all find out what voltage the motor is designed to work on.


Here is the Formula for you to find out you yourself. Power=3IV*Power Factor of that motor. ( The value for I=Current and V=Voltage) must be phase values.


Only if you have a three-phase supply to your home. This is unusual in North American and most of Europe, although it is common in some countries, such as here in Cyprus.Another answerTo run any three phase equipment from a single phase source you will need something called a "phase converter" that can handle the full power of the motor.Phase convertors are very expensive so, before you go out and buy one, find out if a single phase motor is available to match your requirements. It will probably be an easier and cheaper solution for you if you can do that.If you already have a three phase motor that is in good condition, you may be able to find a local dealer who would part-exchange it - or even swap it - it for a good quality used single phase motor with a warranty.Converting or rewiring a three phase motor to run on single phase is not a simple job to do, nor is it worth doing, because the work required would cost a lot to do. It is simply not a practical proposition. That fact is true even for a professional electrical engineer who has all the right equipment to be able to do it.



It should me stamped on the information plate. If this is not on it, then there will be the running current stamped on the plate. Multiply this by the supply voltage to find the power in watts. Take the horsepower of the motor and multiply it by 746. There are 746 watts in 1 HP. It is also the same for single phase motors.


Information about coil winding recycling can be found out from your local recycling plant. You can also look on Scrap Metal Junkie to find out where coil winding can be recycled.


Go to the website of a motor starter manufacture, such as 'Square D'.


Because your home is usually only supplied with one phase and neutral. It is very rare if not impossible to find a three phase supply in a home in the suburbs.