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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