Re: (ET) Elec-trak Digest, Vol 10, Issue 201

["Robert" <euclid delhitel net>]

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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End of Elec-trak Digest, Vol 10, Issue 201
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