The big Klixon®
mounted on the traction motor has all the loads with the exception
of lighting and the lift in series with it. It kills everything, not
just the traction motor.Additionally the thermal limiter in the
field windings protects the motor only by opening the RTN
circuit.With that thought in mind,that Klixon's rating may not
reflect what the traction motor can safely draw.The E-20 tractor has
a 125A Klixon® the lesser tractors use a 100A model.
RJ
On 12/30/2012 10:09 AM, Robert wrote:
Yes, Thanks. I'm surprised at the HP, I thought it
would be higher as GE advertised the E20 as having the power of a
16 HP tractor. Back then ICE garden tractors had much lower HP,
usually in the range of 5 to 8 HP. Of course, as many of you know
electric motor HP and ICE HP are two quite different animals and
this is where electric motors shine. Also torque curves are much
broader for electrics. I'm going to do some empirical testing of
the motors I have (4 wire ohms, etc.) to see what kind of amps the
controller needs to be but ball park figures: 746 watts = 1HP,
according to your data at 25 amps; 25 x 36 = 900 ; 746/900 = 83%
efficiency which is surprisingly good! What I will have to do is
figure the maximum current just before the breaker pops and add
50% to this to make the circuit durable. I can probably get a good
idea from the winding resistances and the shunt used across the
current (load) gauge. Anyone have those specs? If not I can
probably dig one out from my recently acquired stuff and measure
it. I did get some circuit diagrams too showing how GE regulated
the motor back then, that should help too. Didn't someone say the
breaker pops at about 100 amps? That would make sense.
Thanks again for your help guys!
Rob
-----Original Message----- From:
elec-trak-request cosmos phy tufts edu
Sent: Saturday, December 29, 2012 11:11 PM
To: elec-trak cosmos phy tufts edu
Subject: Elec-trak Digest, Vol 10, Issue 201
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Today's Topics:
1. Re: motor ratings (David Brandt)
----------------------------------------------------------------------
Message: 1
Date: Sat, 29 Dec 2012 14:38:24 -0800 (PST)
From: David Brandt <ev_dave13 yahoo com>
To: Robert <euclid delhitel net>,
"Elec-trak cosmos phy tufts edu"
<Elec-trak cosmos phy tufts edu>
Subject: Re: (ET) motor ratings
Message-ID:
<1356820704 55246 YahooMailNeo web164603 mail gq1 yahoo com>
Content-Type: text/plain; charset="iso-8859-1"
Robert, this is an email that was sent on the list recently by
walter Konstanty.? I hope it will help you.
?Elec-Trak Motor Descriptions
Elec-Trak Motor Descriptions
Reference: Model/ID # HP/Size Volts Amps RPM If Rf Winding
Mounting
Drive Motors E15 5BCY56RA6 1 36 25 2250 1.9/.5 Stab Shunt foot
E20 5BCY56TA2 1.2 36 30 2250 1.9/.5 Stab Shunt foot
Demo ES-93A-33 D&D 3.5 36 85 2900 5 Shunt foot
E12 5BCE56KB5B 1.5 36 37 3500 2.25 16 Stab Shunt foot
GE "JB" motors 5BC48JB529 / 302 2 36 52 3300 Series foot
Mower Motor 7.5" tall 5BPA34NAA7 datecode EFN 0.6 36 15 4000
none PM flange
6.5" tall Bosch/Danaher BA3816-815-1 0.6 36 15 3200 none PM
flange
Snowblower Original 5BC49JB131A / 142A 2.5 36 66 3100 4.8 22
Compound foot
Lift Original 5045631 Delco Window Motor 0.25 18 slow none PM
flange
Original - higher volts run @ 24VDC - check heating 24 faster
ATV Winch - Walt's ATV 12VDC Winch assembly 1 12 30 fast none PM
foot
Tiller Original 5BC49JB133B 2.5 36 66 3100 4.8 Compound foot
Updated WJK 3/31/09
David Brandt
From: Robert <euclid delhitel net>
To: Elec-trak cosmos phy tufts edu
Sent: Saturday, December 29, 2012 11:03 AM
Subject: Re: (ET) motor ratings
Hi group,
As I've said before I'm designing motor controllers (thanks for
the links). I sent an email to Steve Shore asking if he has any
info on the motor requirements but if anyone here has the info you
have please send it along. I need to know what the max current
draw of the largest motor is (E20). Also what's the HP of the E20
motor? I figure once the E20 is designed I can use the same drive
for the rest of the 'fleet'.
I know there are controllers around but they are several hundred
bucks, once I know what the current specs are I can get a better
idea of how to proceed.
Thanks for the help,
Rob
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