Unidirectional or Bidirectional
Unidirectional or Bidirectional
(OP)
Helo,
I have a motor which drives a coal crusher. Is there a way to determine whether it is a uni-directional or bi-directional motor? I currently only have its rating, specification plate.
I have been trying to look for the information online, but only managed to get the catalouge of the motor, which is basically the details available from its rating plate.
Type : YKK 5003-8
Standard No. : JB/T 10315.2 - 2002
Thank you in advance.
I have a motor which drives a coal crusher. Is there a way to determine whether it is a uni-directional or bi-directional motor? I currently only have its rating, specification plate.
I have been trying to look for the information online, but only managed to get the catalouge of the motor, which is basically the details available from its rating plate.
Type : YKK 5003-8
Standard No. : JB/T 10315.2 - 2002
Thank you in advance.





RE: Unidirectional or Bidirectional
If it's single phase it could be reversible.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Unidirectional or Bidirectional
I would not hesitate to run it either direction.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Unidirectional or Bidirectional
RE: Unidirectional or Bidirectional
Bill
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"Why not the best?"
Jimmy Carter
RE: Unidirectional or Bidirectional
I haven’t worked with water cooled machines, but I have noticed that 2-pole machines are more likely to have directional fans than slower speed machines.
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(2B)+(2B)' ?
RE: Unidirectional or Bidirectional
Among larger motors, I'm thinking the 4-pole and above tend to have spider style rotors aid in the cooling and need no axial fan. The 2-pole tend to have solid rotors so need special extra cooling with axial fan . There are also radial blades to cool the endwindings.
At least that's what I've seen. I would double check by inspection or contacting manufacturer.
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(2B)+(2B)' ?
RE: Unidirectional or Bidirectional
Only one comment about your question, usualy when the direction of rotation of one motor is only one you will find an arrow that points to the direction of rotation, in this cases the manufacturer also indicate in the name plate the rotation sequence (example. u-v-w and arrow pointing to direction rotation).
Your above comment is correct " This is a 3-phase motor and they have bi-directional fan blades on the rotor/shaft. Is this is a good indication to confirm that the motor is operable/rotating in both direction " and this point is exactly that you need to confirm when you want to change the direction rotation in one unidirectional motor, i.e. for possible reverse of rotation in one unidirectional motor you most check first if the fan blades are proper or not to provide the air flow for cooling the motor.
Regards
Carlos
RE: Unidirectional or Bidirectional
RE: Unidirectional or Bidirectional
Thanks for all your comments.
RE: Unidirectional or Bidirectional