Re: (ET) E15 motor is not a compound.

[Charlie <medievalist gmail com>]

I love these discussions.  I've learned almost everything I know about
Elec-traks by lurking in this mailing list for a couple of years.

Thanks,
--Charlie




On Mon, Sep 17, 2012 at 11:12 AM, RJ Kanary <rjkanary consolidated net> 
wrote:
>            A look at the schematics will also show that the E-15 and E-20
> traction motors are configured in identical fashion.Both have a winding 
> in
> series with the armature.
>               Honest. :)
>
>                 If I have an ambition attack I will take photos of the 
> cases
> and windings of both of the field cases.
>
> RJ
>
>
>
>
> On 9/17/2012 10:50 AM, Chad Bush wrote:
>>
>> 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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