×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Phase Order to motor

Phase Order to motor

Phase Order to motor

(OP)
If I connect wires to a motor and the order is

L3 wire goes to L1 motor connection
L1 wire goes to L2 motor connection
L2 wire goes to L3 motor connection

will the motor run backwards?  Instead of providing 123, I am providing power skewed at 231.  The phases are still in sequential order.  

Thanks for your help.

Craig

RE: Phase Order to motor

There will be no difference in rotation direction if you roll leads from 1 2 3 to 2 3 1

Whether it is the right direction is  tougher to know

=====================================
(2B)+(2B)'  ?

RE: Phase Order to motor

In other words, the connection you described above if equivalent (for rotation) to 1-1 2-2 3-3

=====================================
(2B)+(2B)'  ?

RE: Phase Order to motor

Hello Craig

If the motor is not uniderection designed( the motor must run in one direction due to the fan only blows air in that direction) you can connect the motor random,  runs and note rotation direction. (L1-T1, L2-T2, L3-T3)If the Rotation direction is not the desired then change two of the Phases.(L1-T1, L2-T3, L3-T2)

L is power and T is motor lead

If is a unidirectional fun you most determine the power phase sequence and connect like name plate sayds.

Regards

Carlos

 

RE: Phase Order to motor

If it's of any value the metric standard for motor rotation is that RWB connected to L1 L2 L3 on the motor causes it to rotate clockwise looking AT the drive shaft end.  Assuming phase rotation is RWB.  In thye City of Melbourne 100 years ago the elders decided the phase rotation was to be RBW.  That caused various levels of grief and meriment.
If a motor has ben rewound there are no guarantees of rotation unless the rewinder has been told to get it right.

RE: Phase Order to motor

That's Melbourne Australia, apologies to Melbourne Florida.

RE: Phase Order to motor

Think that through a little more:

1-2-3 = 1 followed by 2, followed by 3, then what? 1, followed by 2, followed by 3, followed by 1, followed by 2, followed by 3 ad nauseum, right?

2-3-1 = 2, followed by 3, followed by 1, followed by 2, followed by 3, followed by one ad nauseum.

See the pattern here?

"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
  
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies  

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources