Motor Rotation Direction

It's always clockwise, and also anti-clockwise.

Depending on which end of the motor is being observed.

Using a search engine will reduce your lack of knowledge.

And they don't judge you by the quality of the questions you ask, like humans do.

What determines which way an induction motor rotates ...

Does this mean that when crossing the equator it reverses direction? Does it also leap ahead at the International Dateline? RODFLMFAO

If there is a gravity well, can it pump gravitons?

NEMA MG-1 Section 2.24 adds the piece of information that your statement lacks, namely "...when facing the end of the machine opposite the drive end..."

Does that standard specify how the phases are identified and wired to the motor?

Yes, it does. Of course there will always be nonconforming units, basically one-offs and specialty motors, in which case the direction of rotation is to be marked on the nameplate. All of this assumes that the manufacturer does not take the attitude "Standards, we don't need no stinkin' standards!!!" (with apologies to Mel Brooks).

if you don't like just go to Australia, it will run backwards

LOL!

And to think I have been under the false impression all these years that "standard" motor rotation direction is directly related to personal "left-side" or "right-side" eye dominance!

There are wiring standards of all sorts that try to impose a rotation standard, it all depends on which standard one is referring to that defines the AC phase sequence, stator winding versus rotor orientation of clockwise and counterclockwise motion and any definition of mounting orientation and perspective.

However since you limit your topic to the broad range of any induction motor I disagree that any wiring standard can by implication identify how to get a rotor to spin one way or the other. A single phase shaded pole motor is also an induction motor. A relatively inefficient, small power motor but an induction motor none the less. This single phase motor will spin in only one rotation regardless of any wiring configuration convention.

Think about it. The more you think about this exception, you will understand why it makes the rule.

"A single phase shaded pole motor is also an induction motor. A relatively inefficient, small power motor but an induction motor none the less. This single phase motor will spin in only one rotation regardless of any wiring configuration convention."
Not quite true - Whereas a normal shaded pole motor requires the physical reversal of the field winding to achieve rotational reversal, there is such a thing as an electrically reversible shaded pole motor. It has wire wound coils in place of the normal shading rings, plus extra coils on the opposite salient pole sections. Rotational reversal is achieved by a C/O switch which changes the electrical location of the pole shading.

Doesn't that depend upon the direction of observation, Mildred?

Doesn't it also depend upon local phase rotation too?

Default rotation is the one that's correct for your application.

Some applications require reversability, what then of default rotation? How about electrically braked motors ( not brake motors)? Their default rotation could well be stationary and locked.

Many other posters here have provided you with a lot of good info.

Why are you asking?

Hi there , there is no specific direction for your motor to turn....it depends on the diriction of your driven (the thing you want to drive with your motor)...if your driven must turn anti clocks then you connect your motor to turn anti clocks......if the driven must turn clock wise then the motor must turn clock wise...................

Is that enough given in with a "Teaspoon".....it looks like you want to know something

about "Electricity".....................Good luck

Ahhhh...but what if the driven is a gear? Then the motor would need to turn anticlockwise for the driven gear to turn clockwise.

The OP was talking about the default rotational direction for motors as in when they come from the manufacturer, and the convention is that when looking from the non-shaft end, it turns CCW, but as has been mentioned, this convention is often not followed.

For 3-phase, what phase rotation and wire or terminal numbers are specified, if any?

The best answer that I personally can give is that of answer #3

Basic 3 terminal 3 phase motors can be labelled A,B,C or 1,2,3 or U,V,W which normally corresponds respectively to red, white and blue but it would be foolish to rely on either the motor or the incoming phase relationship to be accurate if the motor direction could damage the equipment.

Other 3 phase motor terminals can be far more complex, here is a site that will show what I mean.

The prudent action, whether single or three phase, is to always test the direction prior to connecting the load. I saw a sparky start a doughball rolling machine in a bakery in the wrong direction once - thousands of dollars damage in an instant.

What does it realy matter what the default from the factory is ....what matters is the end result of your driven to be correct....even if it is a gear and then what need to happen at the end off the line......

I hate to be unfriendly, but could this be a homework question from someone who didn't listen in class, never learned the "right" and "Left" hand rules etc etc etc.....amongst many other things?

Even really dumb electricians know how to do this, I have met several of them over the years!!

Also, anyone with the slightest "feel" for electrical work would not have asked the question.....they would have simply looked it up and leaned what to change to effect a reversal of rotational movement.....

The problem is, if someone with this poor level of knowledge is working in such an area, what else are they going to screw up and maybe get someone killed....?

Go and get the proper full time training buddy!!!!

Rant over.....

hi all,

mainly Motor direction depends on the pump desing...