CCW or CW Rotation?
CCW or CW Rotation?
(OP)
If one looks at an electric motor the rotation can be CW or CCW depending upon which end of the motor one is viewing from. Dumb question but I have forgotten how to determine CCW or CW so as to order a replacement. Having a senior moment I suppose!
Thanks! Happy New Year!
Thanks! Happy New Year! 




RE: CCW or CW Rotation?
Happy New Year to you too and to others.
RE: CCW or CW Rotation?
I generally call it out explicitly just to make sure.
This is not as hard to remember as the left-hand vs right-hand door swing!
RE: CCW or CW Rotation?
talks about the fact that the standard direction for dc motors single phase ac motors is counterclockwise, when viewed from the end opposite the drive end. (I call that the outboard end.... the non-shaft end).
So it sounds like if you say nothing, that's what you get. If you want different then tell 'em.
Either way it wouldn't hurt to tell 'em which end you're looking at when you say CW or CCW.
You may already be aware that the direction of 3-phase motors is easily reversed by rolling the leads. Also there have been some threads by people talking about possible reversing the smaller motors too.... a little more complicated.
RE: CCW or CW Rotation?
RE: CCW or CW Rotation?
Rotation is obviously an extremely important motor attribute. While many motors are easily reversible (for example, most three phase motors), others are not. For non-reversible motors, you must be very careful to check, and double check that the correct rotation is being specified. Unfortunately, the vendors don't make it easy on any of us, since the specifications of "CW", and "CCW" of course depend on the direction you are viewing the motor; i.e. are you viewing the motor by looking at the shaft end or the opposite end. Some vendors use the shaft end as the reference others use the opposite end.
The following table, lists some common rotation specifications which do not depend on the viewing reference.
Label Descripition
CCW / LE or CCWLE Counter clockwise from the lead end
CCWSE Counter clockwise from the shaft end
CW Rotation Only Shaft can only rotate in a clockwise position
CW / OLE Clockwise opposite lead end
CWLE Clockwise from the lead end
CWSE Clockwise from the shaft end
Double Shaft / CCWLE Spins counter clockwise on a double shaft from the lead end
Double Shaft / CWSE Spins clockwise on a double shaft from the shaft end
CW / CCW or Reversible Clockwise or counterclockwise
ECW Either clockwise or counterclockwise, connected for clockwise rotation at factory
ECCW Either clockwise or counterclockwise, connected for counterclockwise rotation at factory
Reversing Plug Switching the reversing plug changes the rotation of the shaft
CW or CCW The real meaning of these labels is dependent on the manufacturer.
RE: CCW or CW Rotation?
As IEC specify that a motor should rotate clockwise viewed from the drive end, the end result is that it is equivalent to NEMA which is anti-clockwise viewed from the non-drive end.
As many manufacturers supply both NEMA and IEC motors, it is sensible when specifying direction to also specify the end it's viewed from.
RE: CCW or CW Rotation?
if yes then motor will run only in one direction.
Step 2) Check lableling of the main leads of motor usually
motor manufacture phased out leads with the
incomming phases.
Step 3) If load is pump, check in which direction you get
desired flow rate. In order to check fan whether
it is directional or bi directional, check in
which direction you get air output from enclosure.
Step 4) Check the load in case it indicate direction of
rotation because in pump application sometimes
arrow indicated on pumps too.