Field and armature wiring in same conduit?
Field and armature wiring in same conduit?
(OP)
Here's the situation:
An upgrade on our equipment requires a new DC motor. The only available spare embeded conduit is 2 x 1". A 1" is big enough for the field leads(10AWG), but isn't big enough for the armature leads(2/0AWG). However we could split up the field and armature leads and put one of each in the 2 1" conduits. This would be a no-no with three-phase power due to inductive heating, but can you do it with DC motors?
An upgrade on our equipment requires a new DC motor. The only available spare embeded conduit is 2 x 1". A 1" is big enough for the field leads(10AWG), but isn't big enough for the armature leads(2/0AWG). However we could split up the field and armature leads and put one of each in the 2 1" conduits. This would be a no-no with three-phase power due to inductive heating, but can you do it with DC motors?





RE: Field and armature wiring in same conduit?
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Field and armature wiring in same conduit?
RE: Field and armature wiring in same conduit?
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Field and armature wiring in same conduit?
Eddy current heating is proportional to frequency squared, so your 30 % ripple at six times mains frequency will heat^.3*6^2 = 10.8 times the rated 50/60 Hz current. Even with as little ripple as 10 %, you get 3.6 times more heating.
The problem does not exist with WL sets. But I don't think youv'e got one of them. Have you?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Field and armature wiring in same conduit?
Phisically and code wise it depends on which type of wire you choose to use.
respectfully