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Three phase motor winding diagrams - Computers & Internet

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I have to lurn 3 phase winding connection diagrams.

Posted on Aug 06, 2010

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Need wiring diagram for a single phase brook motor n a broomwade compressor


I suggest you contact Brooks if they are still in business. If not there is lots of motor info on the net.

Traditional single phase motors are fairly straightforward and similar to each other. The main thing to watch out for is to have the start and run windings wired with the same polarity. If the polarity is reversed on either winding the motor will run backwards.

Feb 06, 2016 | Air Tools & Compressors

2 Answers

I have Hobart D300 mixer which operates at 220V, 3phase supply and whereas the facility has 208V, single phase supply. Is there any recommended phase converters available for this product. Thanks


Hi Bill
I may be wrong here......
But I've been around Electricity for a long time.
Have Never seen a device that does phase conversion.
A Building site or home will either have Three Phase or Single Phase Power Available
BUT...A portable (Hired) generator could be "three phase" and you could use any one of those phases individually or all three phases.

I have 3 Phase supply to my house!
But I use 230 volt Single Phase for appliances.
My Bore Pump uses a 3 Phase Motor,
(so with a voltmeter it would read about 440 vAC to the pump motor).
Some Further Info:
A GENERATOR is basically a motor used the opposite way. Rotate a motor and it Generates.
The Phases refer to the THREE Windings in the supplying generator in your suburb.
A Large Magnet passes each winding in sequence giving you the three ripples in the supply.
Our houses can choose to have 1 Phase or Three Phases from the street when you set up your electric supply.
So... to confirm, look at the wires on the supply poles to the premises. Usually three in our area (Oz)
Most people are not aware that a car Alternator is actually three phase. The Rotor is the magnet that rotates.
The only difference with an Alternator is that each "Phase" is connected to 2 Diodes (6 total) to convert the three phase to DC to charge the vehicle.
The Regulator controls the voltage to the Rotor, thereby controlling the output.
So.... An Alternator could in theory supply 3 Phase in a mobile generator. Custom Made. Constant speed would determine the frequency of 50Hz or 60Hz.
Not sure what country you are in

Hope this Helps or gives you food for thought!


Three phase electric power

Jul 08, 2015 | Hobart Food Mixers

1 Answer

Where can i obtain a wiring diagram


A one phase 3 wire system has a center tap. Two hots and a neutral. Typical 120/240 volts.
A three phase 4 wire system has Three hots in a Y or Delta. The Y system has three hots and the neutral comes from the center of the Y, this is the neutral and grounded conductor, 120 volts from hot to ground and 208 volts hot to hot. In a 3 phase system the voltage is not doubled hot to hot as in a single phase system because the hots are 120 degrees phased from each other and the square root of 3 is the factor, multiply the 120 volts by 1.73 to get 208 volts hot to hot. Multiply 208 by the reciprocal of 1.73 and get 120 volts. Your exact application is not given so it is not known. A delta system is a triangle and the angle of each triangle is a hot wire, one angle would be grounded or the center tap of one of the sides of the triangle. Y is the configuration of the windings of the alternator or transformer and Delta is the configuration as a triangle of the windings of the alternator or transformer where the power supply is.

With a three phase home service, you can only connect two hots from your single phase generator, and the neutral. One of the house's hot does not get connected and any three phase loads in the house should be switched off and kept from energyzing or a circuit breaker or fuse serving that 3 phase load may trip.
Only one power supply can be connected at a time. The power company power must not be connected at all while using an alternate power supply unless your power supply has means to synchronize the alternating cycle.

It is adviced that the loads be kept within 10% of their rated voltage, especially motors.

May 04, 2015 | Heating & Cooling

1 Answer

I NEED TO REWIRE A DOERR LR24684 ELECTRIC MOTOR,ITS 1/2 HP, RPM 1725 115 volts to a metal lathe AND ON SWITCH IT'S WRITE- FOR IN DOWN IN CENTER STOP AND UP REV -I SEARCH TO CONNECT THIS...


Motor terminal box sometimes has a connection diagram inside the lid.

Basically a single phase induction motor has a run winding and a start winding and to reverse the direction the connections to one winding, usually the start winding, must be reversed and that is the function of the lathe switch.

Single phase motors are easily damaged and so if any doubt exists I strongly suggest you ask a motor specialist for assisstance.

Oct 09, 2017 | Cars & Trucks

1 Answer

I,m not exactley sure how to connect the wiring to the capacitor,on a three phase unit,or one that is wired for three phase (a/c).


If it is a three phase motor then it will not require a capacitor. Residential A/C compressors and fan motors have 3 wires coming out of then but they are not three phase, they are still single phase. If you are working with a residential system then you should have one wire that is common, one wire that is the start winding, and one wire that is the run winding. To connect it, L1 from the contactor would connect to one side of the capacitor. Connect the run wire to the same side of the capacitor. Connect the start wire to the opposite side of the capacitor. The common wire will connect to L2 on the contactor.

Sep 02, 2010 | Heating & Cooling

2 Answers

I need a wiring diagram for the Hobart H600 which has a multi tap motor on and i would like to change the voltage on the motor to 200volt single phase 120/208 or even 120208 3phase. The wiring diagram is...


You cannot wire a three phase motor for single phase and you cannot wire a single phase motor for three phase. If you have a three phase dual voltage motor your options are 220 or 440 volts. If you have a single phase dual voltage motor your options are 120 or 240 volts. A 208 volt Hobart motor will only function correctly on 208 volts and is not dual voltage.

Aug 05, 2010 | Hobart H600 Stand Mixer

1 Answer

Wiring diagram for electricmotor with capacitor


I do not have a diagram for you, but depending on the motor, I can tell you a couple of things. 1. All capacitors are wired in series with the start winding. Most multi-speed motors, that require capacitors, have two brown leads, along with the motor winding leads. If this is the scenario, then just connect line power to neutral and the speed you wish to use, and connect the two brown leads, one to each side of the capacitor. Hope this helps.

Apr 01, 2010 | Heating & Cooling

1 Answer

Changed out blower motor on elect furnace.the old motor had three wires one fed the compaster.new motor is revirsable has purple wire,red,blue,black.hooked up purple 1st phase,red for high 2nd phase. is...


hmmm . you better check on that before firing it up ... normally the colored wires are for different speeds .. only one speed can be connected at a time .. usually the high speed winding is used for air conditioning and a lower speed winding is selected by a relay for heating .. ... the way the capacitor is hooked up determines which way the motor will turn .. your old motor with just 3 wires was probably a single speed motor .. normally the black wire will be connected permanantly to one phase .. the other phase then goes to the selected speed winding (color of wire) .. one goes to the starting capacitor . the others even if not connected will be hot electrically so need wire nuts to prevent shorts ..

Jan 03, 2010 | Dayton (2C373) Fan

2 Answers

Wiring diagram for single phase two pole 2.5 HP induction motor.


all you have to do is (a) open the connection box of the motor look for the two wires of the starting or running coil, inverse only one coil wire.(a) If there is no centrifugal switch in the rotor, try this it might help open the motor both end,change the direction of the shaft ,which i mean pulley side goes to fan side and fan side goes to pulley side and tighten all bolts.

Sep 11, 2009 | Air Tools & Compressors

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