Electrical Motor Connections
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Date: 2023-11-17
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Comments and reviews: 26
Tyrone
We don't have terminal boards inside the connection box on three phsse motors in America, just nine wires brought out from the internal part of the motor into the connection box located on the motor external. All nine wires hang individually loose within the connection box and are NOT connected when bought from the motor vendor. Six of the nine wires have their own number designation attached to them. The designation ranges from the number 4 thru the number 9. Each of the remaining three wires have their own designation as well. Those designations are T1, T2, and T3. Sometimes T1, T2, and T3 may just be labeled as 1, 2, and 3, not having the letter T attached. Again, the nine wires are connected in the field, inside of whatever piece of equipment/system of which they are a part. Three phase motors are built as multi-voltage motors in America. The two voltages are 230 volts 3 phase and 460 volts three phase. How the nine wires are connected is dictated by which voltage listed above is going to be applied to the motor AND whether the connections will be configured as Delta or Wye (Star. The connections within the motor connection box are all made using wire nuts and approved electrical tape, NO terminal boards. Also, the connection box is informally referred to as a peckerhead which is just jargon used in the skilled trades.
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We don't have terminal boards inside the connection box on three phsse motors in America, just nine wires brought out from the internal part of the motor into the connection box located on the motor external. All nine wires hang individually loose within the connection box and are NOT connected when bought from the motor vendor. Six of the nine wires have their own number designation attached to them. The designation ranges from the number 4 thru the number 9. Each of the remaining three wires have their own designation as well. Those designations are T1, T2, and T3. Sometimes T1, T2, and T3 may just be labeled as 1, 2, and 3, not having the letter T attached. Again, the nine wires are connected in the field, inside of whatever piece of equipment/system of which they are a part. Three phase motors are built as multi-voltage motors in America. The two voltages are 230 volts 3 phase and 460 volts three phase. How the nine wires are connected is dictated by which voltage listed above is going to be applied to the motor AND whether the connections will be configured as Delta or Wye (Star. The connections within the motor connection box are all made using wire nuts and approved electrical tape, NO terminal boards. Also, the connection box is informally referred to as a peckerhead which is just jargon used in the skilled trades.
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Tom
So the purpose of the 2 terminals is basically to supply a path for current to flow back. So the windings have an impedance, otherwise you would effectively be shorting out the phases in the terminal box? What material are the windings made out of and to what size? Because to add a high impedance, coil lots of cable and still have them sized appropriately to take the current, doesnt make sense in my head lol. If youre feeding a motor with say a 16mm cable say, 0. 3ohms, and you need to carry that same current, wind it around and have I dont know, 100ohms, w-how? Lol
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So the purpose of the 2 terminals is basically to supply a path for current to flow back. So the windings have an impedance, otherwise you would effectively be shorting out the phases in the terminal box? What material are the windings made out of and to what size? Because to add a high impedance, coil lots of cable and still have them sized appropriately to take the current, doesnt make sense in my head lol. If youre feeding a motor with say a 16mm cable say, 0. 3ohms, and you need to carry that same current, wind it around and have I dont know, 100ohms, w-how? Lol
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education
USA electrician here!
Question for the U. K. & Euros & Asian 240Volt a. c. world.
USA 240V = 1 HOT lead at 120V a. c.
+ 1 HOT lead at 120V a. c. (180 degrees Out-of Phase, 60 Hz)
= 240Vac USA (NO, NONE, NOT present NEUTRAL wire, AT ALL)
BUT! You Brits & co make 240 V a. c. with:
1 HOT lead at 240V a. c.
1 NEUTRAL
= 240V a. c. UK/EURO/ASIAN style!
QUESTION: If I buy a UK/EURO/ASIAN 240V a. c. electric drill, and plug it into a USA 240V a. c. outlet, WHAT HAPPENS?
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USA electrician here!
Question for the U. K. & Euros & Asian 240Volt a. c. world.
USA 240V = 1 HOT lead at 120V a. c.
+ 1 HOT lead at 120V a. c. (180 degrees Out-of Phase, 60 Hz)
= 240Vac USA (NO, NONE, NOT present NEUTRAL wire, AT ALL)
BUT! You Brits & co make 240 V a. c. with:
1 HOT lead at 240V a. c.
1 NEUTRAL
= 240V a. c. UK/EURO/ASIAN style!
QUESTION: If I buy a UK/EURO/ASIAN 240V a. c. electric drill, and plug it into a USA 240V a. c. outlet, WHAT HAPPENS?
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fourforty
Decades ago my then boss acquired a truck reefer unit that would not operate on AC (engine vs AC) I saved his ass. Someone had gotten the two sets of windings, set up for 240/480, out of phase with each other. I used lamp bulbs to find the proper phasing between the two, reconnected and relabeled the pigtails and off we went. He was ready to junk the motor, and to his death I don't think he realized how much money and toruble I saved him.
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Decades ago my then boss acquired a truck reefer unit that would not operate on AC (engine vs AC) I saved his ass. Someone had gotten the two sets of windings, set up for 240/480, out of phase with each other. I used lamp bulbs to find the proper phasing between the two, reconnected and relabeled the pigtails and off we went. He was ready to junk the motor, and to his death I don't think he realized how much money and toruble I saved him.
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BOBMAN1980
I'm currently reading a textbook on electromechanical instruments--as a complete newby who's also having to teach himself the math as he goes along just to try and comprehend what I'm seeing at all.
A few pages from where I'm presently at, I've seen the diagrams for delta and star configurations.
Point being. .. .this video--and others you made--is really helping me out!
Thanks!
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I'm currently reading a textbook on electromechanical instruments--as a complete newby who's also having to teach himself the math as he goes along just to try and comprehend what I'm seeing at all.
A few pages from where I'm presently at, I've seen the diagrams for delta and star configurations.
Point being. .. .this video--and others you made--is really helping me out!
Thanks!
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PharmaGiles
If the star or delta connection is an option in any 3-phase motor, does this mean you can use either configuration in order to get higher or lower power output? This seems a bit odd to me, as I would have expected the motor design to be optimised for one or the other (but I am not an electrical engineer.
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If the star or delta connection is an option in any 3-phase motor, does this mean you can use either configuration in order to get higher or lower power output? This seems a bit odd to me, as I would have expected the motor design to be optimised for one or the other (but I am not an electrical engineer.
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Pgan
Very good explanation but you left the ending Hanging. You could end like this Since the Star Connection uses less current thus Motor Connections should be in Star? or Since Delta connections produce higher voltage of 400 running of Motors is on Delta? . makes better sense?
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Very good explanation but you left the ending Hanging. You could end like this Since the Star Connection uses less current thus Motor Connections should be in Star? or Since Delta connections produce higher voltage of 400 running of Motors is on Delta? . makes better sense?
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RSBot2jar
Do you always need 2 sets of coils per phase across from each other (like in your video? Or would it be possible to use only one coil per phase (so the current enters the coil in U1 and directly goes to U2 at the end of the coil?
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Do you always need 2 sets of coils per phase across from each other (like in your video? Or would it be possible to use only one coil per phase (so the current enters the coil in U1 and directly goes to U2 at the end of the coil?
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justcruisin109
Very interesting so thank you for this. It would be interesting to relate this back to the usage for each configuration - I assume delta is used for higher horsepower motors but where does the cutover occur? Cheers
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Very interesting so thank you for this. It would be interesting to relate this back to the usage for each configuration - I assume delta is used for higher horsepower motors but where does the cutover occur? Cheers
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Aslan
Thank you for the explanation. I wonder what happens if one of three wires coming from controller gets disconnected. Will the motor stop working completely, or will it continue to operate in a much weaker state?
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Thank you for the explanation. I wonder what happens if one of three wires coming from controller gets disconnected. Will the motor stop working completely, or will it continue to operate in a much weaker state?
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krishna
good sir, since star connection is less amps, so is it advisable to run the motor in star conncetion, and then why it is required to start motor in star and run in delta, please clear my doubts.
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good sir, since star connection is less amps, so is it advisable to run the motor in star conncetion, and then why it is required to start motor in star and run in delta, please clear my doubts.
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jiten
square root can be interpreted as equal contribution to each other. multiplication means contibution of one dimension for each unit of another dimension. Equal contribution, or a joint.
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square root can be interpreted as equal contribution to each other. multiplication means contibution of one dimension for each unit of another dimension. Equal contribution, or a joint.
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Lindsay
the engineering mindset, can you explain how and why some 3phase motors are wired up to be star delta aka start in star but run in delta please thanks in advance.
Regards Lindsay
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the engineering mindset, can you explain how and why some 3phase motors are wired up to be star delta aka start in star but run in delta please thanks in advance.
Regards Lindsay
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Wasim
One question sir is a six 6lead motor can run on hight and low voltage as 400 and 230 valts from star or delta connection which one is hight or low voltage as 400 or 230 volts thanks
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One question sir is a six 6lead motor can run on hight and low voltage as 400 and 230 valts from star or delta connection which one is hight or low voltage as 400 or 230 volts thanks
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Samin
Is there any connection between three phase motor shown here and three phase permanent generator used in wind turbines? Is there star/delta connection in permanent magnet generator?
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Is there any connection between three phase motor shown here and three phase permanent generator used in wind turbines? Is there star/delta connection in permanent magnet generator?
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Shadow
Hey The Engineering Mindset,
would you care to explain why at minute 4: 36 you say that you can add a neutral wire if needed?
Is this a choice you can make?
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Hey The Engineering Mindset,
would you care to explain why at minute 4: 36 you say that you can add a neutral wire if needed?
Is this a choice you can make?
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Co
I was a motor rewinder in my days in the NAVY. Your videos remind my of the tedious times I spent battling +50hp motors during less than ideal sea states.
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I was a motor rewinder in my days in the NAVY. Your videos remind my of the tedious times I spent battling +50hp motors during less than ideal sea states.
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SACalkins1
Great video, but this is only for a 6 lead motor. This missed the 9 and 12 lead motors and there is high and low voltage for the different leads.
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Great video, but this is only for a 6 lead motor. This missed the 9 and 12 lead motors and there is high and low voltage for the different leads.
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Mike
Thank you for the explanation and difference between the Y and the DELTA connections. When would the Y connection and the DELTA connection be used?
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Thank you for the explanation and difference between the Y and the DELTA connections. When would the Y connection and the DELTA connection be used?
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rallyscoot
Whats the benefit having Delta conf over Star Config? So Delta config drive higher HP 3 phase induction motors? And Star config is weaker?
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Whats the benefit having Delta conf over Star Config? So Delta config drive higher HP 3 phase induction motors? And Star config is weaker?
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Md. Al-Amin
Thanks a lot for great explanations. Please make a video for VFD repairing lab setup( what type of Instrument need for VFD repairing)
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Thanks a lot for great explanations. Please make a video for VFD repairing lab setup( what type of Instrument need for VFD repairing)
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Mat
Next needs to be star delta starters and the time delay switching over. I thought it was super neat when someone explained what it was.
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Next needs to be star delta starters and the time delay switching over. I thought it was super neat when someone explained what it was.
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james
I'm going to share this if anyone has the know how you can make a self charging car without using charging stations it can be done
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I'm going to share this if anyone has the know how you can make a self charging car without using charging stations it can be done
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Sam
These videos are more than worth a few bucks. You've got people paying themselves into debt for this knowledge. I was one of em.
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These videos are more than worth a few bucks. You've got people paying themselves into debt for this knowledge. I was one of em.
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Fadi
Do You mean by using less current and voltage for the star connection that will give us less voltage and current as output?
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Do You mean by using less current and voltage for the star connection that will give us less voltage and current as output?
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usagi
What happens when you have a motor wired for delta but have wye service? Is there a possibility of burning the motor?
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What happens when you have a motor wired for delta but have wye service? Is there a possibility of burning the motor?
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