Need Reliance E440 Specs

[Evodyne]

Hi all,

I just returned from some scrounging with a box of servo motors. Fourteen Reliance E-712's, eleven Reliance E-440's, and a few Baldor MTE-2250-BCBCN and MTE-2240-BCBCN units.

I have the specs for the Baldors. Reliance was bought by Allen-Bradley and the E712/E440 motors were apparently discontinued. I did find the specs. for the E-712's in a past post here at the 'zone (wow!), but I have been unable to find anything on the E-440's. Can anyone help?

All of the reliance motors use Renco encoders. The number found on the E-440 encoders is 75900-012. The E-712 encoders have no identification. Short of hooking up some counter chips and actually counting the output pulses is there any way of determining what the encoder resolution is?

Any help is greatly appreciated.

Sincerely,

Evodyne

[Al_The_Man]

I have Reliance catalogues going back to 1990 and they do not show a E440 I suspect they supplied these under a customer order as they often did, with a unique number on it, the beauty of DC motors is they are fairly easy to reverse engineer and flexible to incorporate into different drives, there have been several previous posts to this effect I believe.
Renco, I have found good as to suppling info on their part No's. In a pinch, you can unsolder the two LED leads and take the top board off to reveal the disk, it will have the resolution etched in and also youcan see the marker pulse if it has one.
The output IC will tell you what type of output, differential or single ended.
Al.

[Evodyne]

Al,

Thanks for the information. I picked these up for a very reasonable price and want to sell about half to recoupe my investment and, hopefully, buy some other parts. Looking at it from a buyer's perspective, It's always nice to see the specs and know what your getting. I can determine the curves for different supply voltages, but I'm scratching my head at how to arrive at what the rated voltage might be. It's always something! Again, thanks.

Lance

[Al_The_Man]

A rough idea is to assume they are 3000rpm, they may be more but probably at least that, drive them externally at 3000rpm and measure the back emf voltage on the armature leads. That will give you the neccessary applied voltage for that speed.
What are you asking for them or are you putting them on ebay?
Al.

[turmite]

Yea Evodyne I might be next if you are gonna sell them here. I need to know the rpm, voltage ac/dc etc amps and the hp if possible.

Mike

4 would be what I would be interested in if the price is within my budget of course!

[Evodyne]

A rough idea is to assume they are 3000rpm, they may be more but probably at least that, drive them externally at 3000rpm and measure the back emf voltage on the armature leads. That will give you the neccessary applied voltage for that speed.
What are you asking for them or are you putting them on ebay?
Al.

Al,

That sounds like a plan. Thanks.

I'm going to put some of the motors up for sale, fixed price/unit, here on the site. I've had real good luck selling things here.

Believe it or not, I picked up everyting in the picture for $500.00! I'd like to keep six of the E-712's, so I'd be selling eight. I'll need to get controllers for a 3 axis machine, with X & Y being E-712's. If, worse case, I need 2 Rutex 2020's to push them, and a 2010 for the Z axis, along with a motherboard, I'm looking at $722.00 without taxes, so say $800. That plus the $500 I paid (so I can pay those pesky bills this month) is $1300, say $1400.00. That's $175.00 per E-712, which doesn't seem unreasonable given their condition, and their ratings.

The Baldor MTE-2250-BCBCN's are $1,001.00 list straight from Baldor's web site. Of course no one here will pay that. And these work fine but are a little rough looking. They came out of a factory in Mexico I'm told. I'm thinking $100 a piece for these, and $80 each for the 2240's.

And the little E-440's, I don't know, say $50 each. I guess I'd like to get some numbers to quantify their performance first though and adjust the price from there.

I don't believe in taking advantage of people on shipping; I just pass along the cost. I'll ship anywhere-I'm shipping some THK stuff to Finland right now.

I'll probably list at least the E-712's tomorrow. I sell first-come, first-served to those who email me (lance@evodyne.net). Payment is through my Evodyne Soft Systems PayPal account only.

If you have any interest in any of these motors, email me before tomorrow and you'll be 1st in the queue.

Thanks again for your help!

Sincerely,

Lance/Evodyne

[Evodyne]

...I need to know the rpm, voltage ac/dc etc amps and the hp if possible.

Mike

4 would be what I would be interested in if the price is within my budget of course!

Hi Mike,

The E-712's are brutes:

Reliance Electronics
part # 721-015-0774
model#E712
Torque Constant Kt 37.51 +/- 10% Oz-in/A
Back EMF Constant, Ke 25.0-30.5 V/KRpm within 400mv CW to CCW
Motor Terminal Resistance .75-1.02 Ohms @ 4A.
Nominal Voltage Rating 60V
Nominal Speed Rating 2100 RPM
Maximum Peak Torque 1500 Oz-In.
Maximum Peak Current 44.5A
Maximum Continuous Stall Torque At Max Motor Temp 300 Oz-In.
Maximum Continuous Current 8.9A
Motor Inertia .15 Oz-in-sec
No Load Current at 50v .90A Max
Maximum Winding Temp 155 deg C
Shaft End Play .001" Max with 20lb load
Four replaceable brushes.
Motor Body 5.675" Long, 4.0" Diameter
Shaft 1.3" Long, 0.5" Diameter.
1.5" Diameter Positioning Boss, 4 10-32nd Mounting Holes on 2.5" Diameter.

See the attached .jpg's Baldor specs...

Lance