Forklift Motor Efficiency Map?

[bigmoose]

Gents I have searched the net for about an hour for a "typical" brushed DC forklift propulsion motor performance map. Interested in the efficiency contours. Anyone seen or have one?

While we are at it, anyone have schematics for a GE "SCR" towmotor controller?

... don't ask... perhaps I need a very large motor for my coffee bean roaster blower system!

 

[amberwolf]

Have you poked around DIY Electric Car forums? Particularly Major's posts, possibly Qer or Tesseract (the designers of Soliton1 controller for such motors), possibly Otmar's (Zilla designer), Hi Torque Electric (Jim Husted), among others.

This thread is also a good one, dunno if has any maps or links to them.
http://www.diyelectriccar.com/forums/showthread.php?t=7598

 

[bigmoose]

Thanks Amber, great leads! I'll follow them up today. I had not specifically found those threads on that board.

 

[major]

http://www.go-ev.com/motors-warp.html

The WarP motors are basically fork motors; series wound traction motors typically run at higher voltage. The published performance characteristic graphs (speed torque curves) from NetGain include the efficiency trace for a constant voltage case. Those curves are notorious for inaccuracy but should give you an idea of the general shape. The SCR controller schematic should be out there somewhere. I just don't recall where right now. It'll probably come to me later.

edit: google _ge scr manual_ Looks like you can find it from there.