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Re: (ET) E15 motor is not a compound.
Still confused about this?
From what I gather, the E-15 motor is only different from the E-20
motor (field-wise) in that it does not have a flux-compensating field
for increased load on the armature. The compensating field makes
complete sense to me with a large DC motor and a heavy load: allows the
motor to run more efficiently so that it doesn't burn itself up under a
heavy load.
Like David said, we should consider these sep-ex motors, which also
means that without the field being excited, the armature should not
turn. The E-15 motor may have a field winding in series with the
armature, but if I remember correctly, the main field has to be excited
separately. This can be confirmed by looking at the schematics. GE has
excited the field separately, but also simultaneously with the armature
through the L solenoid on an early model with Card 1.
All in all, it doesn't matter if there's a series winding or not on the
E-15 motor. You have to excite the main field separately in order to
have the field weakening available for higher speeds. If a motor is
TRULY series wound, the main field will be in series with the armature
and it will spin when the armature is excited. A good example of this
is the hand-held cultivator/edger. They are series-wound field motors.
Chad
-----Original Message-----
From: The CZ Unit <cz alembic crystel com>
To: elec-trak <elec-trak cosmos phy tufts edu>
Sent: Sat, Sep 15, 2012 10:55 pm
Subject: Re: (ET) E15 motor is not a compound.
On 9/15/2012 8:44 PM, RJ Kanary wrote:
The E-15 traction motor 5BCY56RA6 does have a field winding in
series with the armature.I just dragged three of them out to confirm
it.Funny, they didn't seem THAT heavy when I put them away before the
spinal cord injury. <G>
Hm. Then why does this one not spin at all with no field, even with no
load?
C
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