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Single phase to three phase

The physical internal windings between single phase and three phase motors makes this an impossibility That being said money can make anything happen. Depending on the amount of money you want to spend to make this happen there is a device on the market called a VFD ( Variable Frequency Drive). On the three phase input terminals you apply your single phase voltage. On the output terminals you connect your three phase motor. When run in this configuration there is an internal switch that has to be changed to let the VFD know that it should be looking for only two lines on the input to be hot. Other wise the VFD thinks that there is a line loss on the three phase input terminals and the unit will not start.

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Some 3 phase motor speed controllers can be run off a single phase supply, this caused us a problem at work when a new speed control was fitted to some laundry equipment, as we then had to rewire the supply to bring in a nuetral, so i suggest a speed controller is probably the solution.

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14y ago
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12y ago

No, you cannot rewind a three phase motor to run on single phase, the motors are mechanically different. Single phase motors usually have separate start windings and centrifugal switches to aid in run up speed.

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12y ago

No. You need a three phase supply to run a three phase motor. If you only have a one phase supply, you could use an inverter or a motor-generator set, but by the time you did that, it would have been more cost effective to simply get a one phase motor, or (in the bigger case) upgrade to a three phase supply.

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13y ago

Yes, all three phase motors can be reversed by inter changing any two of the three phase feed conductors.

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Q: Can you connect a 3 phase motor to a 1 phase supply?
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How do you replace a 3 phase 5hp motor?

I assume that by two-phase, you really are talking about a supply with two hot wires and a neutral, such as 120/240 volt. This is single phase power, it just has power taps on both ends of the transformer winding, the neutral is the center tap. I don't think it is possible to convert or rewire your motor. A large 3 phase motor must be run on a 3 phase electrical supply. It will not run and will overheat if you try to connect it to a single phase supply. The only way to make a 3 phase supply from a single phase supply is to use a converter like a motor-generator set. That would be way more expensive than getting a new motor.


What is an electrical star delta configuration?

A star configuration of the windings in a 3-phase transformer or motor is where one end of each winding is connected to form a star or 'Y' pattern and the other ends are each connected to one of the three separate lines of the incoming 3-phase electrical service.A delta configuration is when each phase winding of a three phase transformer or motor is connected to its two adjacent phase windings to form an arrangement that looks like the Greek letter delta - or triangle - and then each point of the triangle is connected to to one of the three separate lines of the incoming 3-phase electrical service.To be able to wire a 3-phase transformer or motor either in star or delta, all 6 ends of the three sets of coils, called "windings", have to be exposed with suitable connection terminals.The windings are often labelled A1, A2, A3 and B1, B2, B3, where "1", "2" and "3" denote the separate phase windings and "A" and "B" denote the beginning and end of each winding.Another way of describing it is to say that the separate windings can be labelled:Winding 1: A1 B1. Winding 2: A2 B2, Winding 3: A3 B3.In star configuration either all the A's or all the B's are connected together and the 3-phase supply (consisting of three separate "phase lines" labelled L1, L2, L3) is connected to the remaining three connectors. For example, if you connect B1 to B2 and B2 to B3 to form the center of the "star" then you must connect supply L1 to A1; supply L2 to A2 and supply L3 to A3.In delta configuration, connect B1 to A2, B2 to A3, B3 to A1. (If you draw that out as a schematic diagram, it will be a triangle.) Then connect supply L1 to A1; supply L2 to A2 and supply L3 to A3. (Exactly the same as the supply lines were connected before, for the star configuration.)For more information see the answers to the Related Questions shown below.


What rating of capacitor is used on single phase motor?

If a capacitor is directly connected across a motor then the capacitance of the capacitor will be calculated as under.Q = 0.9 * Sqrt (3) * V * I0.Here "V" = Supply voltage & I0 = No Load Current of Motor.AnswerThere is no need to connect capacitors across a three-phase motor.


How to change the speed of a three phase motor?

A typical 2 speed three phase motor will have 6 leads on the motor windings which will require 3 contactors to incorperate both the "high" and the "low" speeps. Inorder for the motor to run on "low" speed you need to have a contactor (c1) that pulls in for the L1, L2,L3 leads... that should achieve the "low" speed of the motor.. To achieve the "high" speed you will need a contactor (c2) to shun or short L1,L2,L3 together... and another contactor (c3) to pull in the L4,L5,L6 leads... to recap ... Low speed will requrie c1= L1,L2,L3 powered by phase 1, phase 2, phase 3 of the primary source voltage. High speed requires c2 to short or shun L1,L2,L3 together while c3= L4,L5,L6 to be powered by Phase 1, Phase 2, Phase 3 fo the primary source voltages. Be sure to check for proper rotation of the motor and by reversing any 2 leads of the primary source voltage you will change the rotation for the motor. This can also be done using two contactors by having L1,L2,L3 connected to the first contactor and also the additional contacts mounted on top of the second contactor. L4,L5,L6 are connected to the second contactor. The important thing to remember is to use an interlock which fits into both contactors when they are clipped together. This stops both contactors operating at the same time!!! ( the additional contacts mount on top of a contactor and are mechanically connected to it so that they act together)


How much will it Cost to upgrade an electricity supply from phase 1 to phase 2 for a Melbourne home?

If you are asking whether it is possible to upgrade from single phase to two phase, then you should understand that a two phase system is archaic and will not be available from your electricity supply company. If you are asking whether your company can supply two lines (out of three) it's quite unlikely -they will normally supply single phase or three phase! You can likely upgrade to three-phase if you have a reason to do so -e.g. to operate three-phase motors. As for the cost -you'll have to check that our yourself!

Related questions

Is 3 phase motor run on 1 phase supply?

No. That would be a single phase motor.


Will 3 phase AC motor stay running if you remove 1 phase?

Yes but it will not start. Usually if you lose one phase the current will go higher on the other phases and the motor overload protection will disconnect the motor from the supply voltage.


What is the simplest way to run a 3 phase 380 V motor of about 1 KW directly on 220 V single phase supply without resorting to rewinding or frequency converters?

You cannot run a three phase motor on single phase power. You'll burn the motor up within minutes. By the way, I've never seen or heard of a 380 volt motor. Do you mean a 480 volt motor? If so, the only way you can power it is with the correct full voltage and a 3 phase power supply.


How do you replace a 3 phase 5hp motor?

I assume that by two-phase, you really are talking about a supply with two hot wires and a neutral, such as 120/240 volt. This is single phase power, it just has power taps on both ends of the transformer winding, the neutral is the center tap. I don't think it is possible to convert or rewire your motor. A large 3 phase motor must be run on a 3 phase electrical supply. It will not run and will overheat if you try to connect it to a single phase supply. The only way to make a 3 phase supply from a single phase supply is to use a converter like a motor-generator set. That would be way more expensive than getting a new motor.


What is the phase current of a three phase 2.2kw 415v motor connected in star?

The line current would be the same if the motor were connected in delta. The current can be based on the rule of thumb which says 7 amps must be allowed for a 1-HP single-phase motor on 240 v. A 2.2 kW motor is three times as powerful, and on a three-phase supply of the same voltage (240/415) it would draw 7 amps.


What is an electrical star delta configuration?

A star configuration of the windings in a 3-phase transformer or motor is where one end of each winding is connected to form a star or 'Y' pattern and the other ends are each connected to one of the three separate lines of the incoming 3-phase electrical service.A delta configuration is when each phase winding of a three phase transformer or motor is connected to its two adjacent phase windings to form an arrangement that looks like the Greek letter delta - or triangle - and then each point of the triangle is connected to to one of the three separate lines of the incoming 3-phase electrical service.To be able to wire a 3-phase transformer or motor either in star or delta, all 6 ends of the three sets of coils, called "windings", have to be exposed with suitable connection terminals.The windings are often labelled A1, A2, A3 and B1, B2, B3, where "1", "2" and "3" denote the separate phase windings and "A" and "B" denote the beginning and end of each winding.Another way of describing it is to say that the separate windings can be labelled:Winding 1: A1 B1. Winding 2: A2 B2, Winding 3: A3 B3.In star configuration either all the A's or all the B's are connected together and the 3-phase supply (consisting of three separate "phase lines" labelled L1, L2, L3) is connected to the remaining three connectors. For example, if you connect B1 to B2 and B2 to B3 to form the center of the "star" then you must connect supply L1 to A1; supply L2 to A2 and supply L3 to A3.In delta configuration, connect B1 to A2, B2 to A3, B3 to A1. (If you draw that out as a schematic diagram, it will be a triangle.) Then connect supply L1 to A1; supply L2 to A2 and supply L3 to A3. (Exactly the same as the supply lines were connected before, for the star configuration.)For more information see the answers to the Related Questions shown below.


Classification of ac motor?

ac:1) 1 phase 2) poly phase 3)universal


How many watts is 1 hp at 480volts?

A 1-HP motor is reckoned to draw 7 amps at 240 v single-phase. The same power of motor would draw 3.5 amps at 480 v single-phase, but a 480 v supply could most likely be a three-phase suppy, and the current in that case would be reckoned as 2 amps.


How do you convert single phase supply to three phase for running a 3-phase motor?

Any business, such as a factory, or any home needing a 3-phase supply for some equipment would usually get that supply by having it installed by their local electric power utility company.For a very small 3-phase motor, solid state power inverter units are available nowadays which can be powered from household 1-phase supply.If you want to know how to convert a 1-phase to a 3-phase supply for high power applications it can be done using a motor/alternator set or a solid state inverter unit but to use these safely requires specialized equipment and electrical engineering knowledge. The full answer is too complicated to explain here.Depending on the amount of money you want to spend to make this happen there is a device on the market called a VFD ( Variable Frequency Drive). On the three phase input terminals you apply your single phase voltage. On the output terminals you connect your three phase motor. When run in this configuration there is an internal switch that has to be changed to let the VFD know that it should be looking for only two lines on the input to be hot. Other wise the VFD thinks that there is a line loss on the three phase input terminals and the unit will not start.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-energizedIF YOU ARE NOT REALLY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.


How do you find out 3 phase motor watts?

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.


How do you wire start and run capacitors into an electric motor?

Connect your start capacitor in series with the start winding.Connect the run capacitor in the common terminal and Line 1 of the power supply.


How you can convert 1-phase voltage to 3-phase voltage and vice-vars a?

A single-phase supply is obtained between any two line conductors or between a line and neutral conductor of a three-phase supply. To obtain a three-phase supply from a single-phase source is far more difficult, and requires additional equipment.