Motor rotation

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I'm going to buy a motor for a project I'm doing. If the specs state the rotation is CW is that looking from the rear towards the shaft or looking at the shaft towards the rear of the motor? DannyMy SiteJust worrying 'bout what I can't get to today.
Reply:looking at the front of the motor which is looking at the shaft right in front of you . i don't know what you are building if the motor can be mounted in any position buy mounting it 180 deg. the opposite you can turn the machine in the opposite rotation regardless of the motors rotation . good luck ..chris
Reply:Under the cover where the electrical connections are located, it will tell you what needs to be swapped around to change the rotation from whatever it is.Cheers,  Tony._________________________________Transmig 310 + Argoshield LightOxy acetyleneOxy propanePrehistoric stick welder_________________________________
Reply:Rotation is for the shaft end.  Face the shaft and the rotation is the direction the shaft turns.   Standard rotation for prime movers is counter-clockwise.
Reply:Not trying to be a know-it-all, but drive motors are something I deal with a lot. Sometimes motors are are marked cw/le, which means clockwise/lead end, that means the end where the wire leads  enter into the  case of the motor, most times that is the rear of the motor. If it specifies cw/se, this means clockwise/shaft end. If it is a double shaft motor, it can be even more confusing, normally these motors have an arrow on the body or the information plate to indicate the rotation. Some motors are reversible by changing the internal, or external wiring. Don't assume anything, always make sure. It is a bad feeling to install a motor & then find out the rotation is wrong!
Reply:lstilts is correct. Back in the old days you could assume that it was the shaft end. Not any more. Rotation designation seems to be at the manufacturers whim!
Reply:Sometimes what a motor is connect to can be damaged if turned in the wrong direction. A phase rotation meter is a very good tool to have if frequently working with motors. If a three phase motor is used phase A and C should be swapped to change direction never interfere with B. All changes are done at the motor connection box and not at the panel.I.B.E.W Electrician and Damn Proud of It !!!! .Virtus Junxit Mors Non Separabit http://www.shrinershospitalsforchildren.org/
Reply:I'm pretty sure The_Blacksmith is looking for a fractional hp motor to turn his bean roaster. Most of the small motors are as viewed from the shaft end. Found this url with a picture that may help. http://www.acepumps.com/en/index.php.../C39/Rotation/
Reply:Originally Posted by Sparky#1Sometimes what a motor is connect to can be damaged if turned in the wrong direction. A phase rotation meter is a very good tool to have if frequently working with motors. If a three phase motor is used phase A and C should be swapped to change direction never interfere with B. All changes are done at the motor connection box and not at the panel.
Reply:Originally Posted by rlitmanThat's crazy.  It may be the smart way to do things, but in three phase, swapping any two phases will change the rotation.  The motor won't know the difference if you swap A and B, or A and C, or B and C.
Reply:Maybe,so not to  swap the wild leg to keep everything uniform. although I have done both ways, I never  assume anything! The good news is, most fractional hp motors, even single phase, nowadays are reversible, the key word being "most"!
Reply:Originally Posted by Sparky#1Their is a reason which I forget right now but it is the way we were taught to do it,always swap a & c at the motor.
Reply:Originally Posted by papaharley03All the Leybold vacuum pumps I changed out had a plate on the motor that stated, 'swap any two phases to reverse rotation.' This was the same plate that showed high and low voltage connection diagram.As equipment techs, we had no idea which was A, B, or C phase. We just knew there were 3 phases and ground on the twist lock connector.Never had an issue in my 25 years doing it that way.Papa
Reply:Originally Posted by 76GMC1500The OP hasn't stated his exact application yet.
Reply:In the single phase world, most capacitor start motors are reversible but motors like shaded pole motors are not.
Reply:Originally Posted by papaharley03All the Leybold vacuum pumps I changed out had a plate on the motor that stated, 'swap any two phases to reverse rotation.' This was the same plate that showed high and low voltage connection diagram.As equipment techs, we had no idea which was A, B, or C phase. We just knew there were 3 phases and ground on the twist lock connector.Never had an issue in my 25 years doing it that way.Papa
Reply:Again,not trying to be a know it all, but even a shaded pole motor can be reversed by removing the ends, turning the armature 180 degrees & reassembling it.I have done this in the field per equipment manufacturers instructions, this was several years ago, as far as I know, it is still in service.
Reply:TO this day i will still bump start most motors to assure proper rotationVantage 500's LN-25's, VI-400's, cobramatics, Miller migs, synch 350 LX, Powcon inverters, XMT's, 250 Ton Acurrpress 12' brake, 1/4" 10' Atlantic shear,Koikie plasma table W/ esab plasmas. marvel & hyd-mech saws, pirrana & metal muncher punches.
Reply:Originally Posted by DualieTO this day i will still bump start most motors to assure proper rotation
Reply:Originally Posted by 76GMC1500In the single phase world, most capacitor start motors are reversible but motors like shaded pole motors are not.