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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.
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoA 3 phase 5 hp motor is a fair size motor and I must say up front that if you don't know how to, you might not should be doing so without a licensed Journeyman electrician. If you make one wiring mistake, the motor may burn up and they aren't cheap! With that said, a 3 phase motor has different wiring hook ups for low voltage, (208-240 volt) and high voltage ( 480 volt). A 3 phase motor has nine wire leads inside the "make up" cover. They will all have a number tag on them from 1 through 9. Your incoming three phase power of course has three "hot" legs which from left to right in the panel are A,B and C phase. These wires should be color coded for 208-240 as: Black (A phase) Red (B phase) and Blue (C phase). For 480 volt these colors will be Brown(A) Orange(B) and Yellow (C). The A,B & C phases are the line voltage conductors and are to be considered as L1,L2 and L3 when connecting to the motor. The correct connection for a low voltage (208-240V) 3 phase motor which is "Y" or "star" connected internally is: Connect The L1 (A phase) to wires # 1&7 on the motor (wire nut or split bolt all three)Connect the L2 (B phase) to wires # 2&8 Connect the L3 (C phase) to wires #3&9 Then connect motor wires # 4, 5 & 6 together Make certain you ground the motor properly!! The correct connection for a high voltage (480 V) 3 phase motor which is "Y" or star connected internally is: L1 to motor lead#1, L2 to 2, L3 to 3, then: connect motor leads 4&7 together, 5&8, and 6&9. Again, these connections are for Y connected motors. Almost all are these days as powers companies have gone to a standard delta to Y step down in voltage transforming. Again, if you're not clear on this or haven't wired large motors before, I highly recommend you hire a licensed Journeyman electician to do it. Remember, the physical wiring connections are critical and must be done well. They should be made with a brass split bolt, rubberized electrical tape and then high temp electrical tape. Motors vibrate and bad connections will come loose, causing an open or short circuit, or worst case for the motor to single phase and burn up.
Wiki User
∙ 13y agoThere is no 2 phase. Three phase and single phase only. There is no conversion you have to replace it.
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What size motor do you need to run a compressor 2 stage 80 gallon tank i have a 3 phase on it and want to change motor?
You probably need a 5hp or 7hp motor. Look for HP rating o the 3 phase motor and select the same for single phase. 3 phase has same power but is more efficient at electricity use. Also consider a 3 phase converter. It allows a 3 phase motor to run on single phase service.
Can you replace a three phase motor 3 Hp RPM 1420 with a single phase motor for a planer?
Probably not. The single phase three horse power motor will be much larger in physical size than its three phase counterpart, and will probably not fit.
Is a 3 phase motor a Synchronous motor?
A synchronous motor can be a type of 3-Phase AC motor, or not.A synchronous motor is defined by the period of the rotor being synchronized with the frequency of the stator windings' current. The stator windings might be 3-Phase or not (2-Phase would work).Also synchronous motors are not the only type of 3-Phase AC motors. An induction motor could also be 3-Phase AC and has a few advantages and disadvantages over a synchronous motor.
Can you replace a 3 phase motor with a gas motor?
by using dc volts across pairs and with an analog meter to check the deflection of the needle to determine if they are in phase
When changing phase rotation of a 3 phase motor is this done at the switchboard?
The phase rotation of motor should be always done from motor side i.e The motor terminal box.
What size motor do you need to run a compressor 2 stage 80 gallon tank i have a 3 phase on it and want to change motor?
You probably need a 5hp or 7hp motor. Look for HP rating o the 3 phase motor and select the same for single phase. 3 phase has same power but is more efficient at electricity use. Also consider a 3 phase converter. It allows a 3 phase motor to run on single phase service.
Is there a way to rewire a 5hp 3phase motor to run off of 240v without buying additional equipment?
No, you only have phase a and b. The motor will run as smoothly as a 3 phase motor that has lost a leg of power. That is if the motor is designed for 208v in the first place. Not a good idea.
What would be the horse power required in a 3-phase motor to replace a .5 horsepower single phase motor.?
You still need the same horsepower. The advantage of the three-phase motor is that it will draw lower current.
Can you replace a three phase motor 3 Hp RPM 1420 with a single phase motor for a planer?
Probably not. The single phase three horse power motor will be much larger in physical size than its three phase counterpart, and will probably not fit.
Can you replace a 480-240V 3-phase motor with a single phase motor as a temporary replacement or will it burn it out?
Yes, you can, and it won't burn out IF>>> the horsepower rating is the SAME. Pay attention to wiring and motor rotation. Also check the voltage: the motor voltage must be the same as the voltage between two hots of your 3 phase system. You will only use two hots as this is a single phase motor.
Is 3 phase motor run on 1 phase supply?
No. That would be a single phase motor.
How do you turn a 3 phase motor in to a generator?
We can convert a 3 phase ac motor into generator by changing phase sequence of the ac input cable of that motor
Can a starter used for 5 hp 3 phase motor be used for 7.5 hp 3 phase motor?
No.
Is a 3 phase motor a Synchronous motor?
A synchronous motor can be a type of 3-Phase AC motor, or not.A synchronous motor is defined by the period of the rotor being synchronized with the frequency of the stator windings' current. The stator windings might be 3-Phase or not (2-Phase would work).Also synchronous motors are not the only type of 3-Phase AC motors. An induction motor could also be 3-Phase AC and has a few advantages and disadvantages over a synchronous motor.
How do you convert or rewire a 20HP 3 phase motor to single phase motor?
The winding design of the motor will not economically allow this to work. You would have to drive a 3 phase generator to supply it.
Can you replace a 3 phase motor with a gas motor?
by using dc volts across pairs and with an analog meter to check the deflection of the needle to determine if they are in phase
What are the advantages of three phase motor over the single phase motor?
A 3-phase motor produces a steady torque that does not pulsate. A 3-phase motor starts turning in the right direction when switched on without the need for a separate starting winding.
