I have a couple of these NPC 64038 motors and I was wondering if you had any pics of how you mounted the sprocket on them.
The drive motors are NPC 64038. These are 2 hp wheel chair motors that I had previously used in my 220 lb Battlebot. They have the gearbox built in.
I'm running them at 24 volts. And I am actually gearing them up a little to get more speed. The motor has a voltage constant of 10 RPM/volt, so with my gearing the drive sprocket is turning at about 325 RPM.
The chain is #40, and the drive axle is 1" steel. All of this stuff was scavenged from my Battlebot material.
I used EV warriors on a 120 lb Battlebot that I built last year. They worked OK and gave pretty good speed, but they really aren't robust enough in the Battlebot world for a speedy 120 lb bot. Especially if you use 4 wheel drive skid (or tank) style steering. The motors are working really hard when you have to drag one side through a turn. After a 3 minute match, the things were red hot!
It seems like the EV warrior would work OK for a 100 lb Tank, with the right gearing and with a little less duty
cycle. In the Battlebot world we are shooting for at least 10 MPH, I think in the tank world 5 MPH is pretty fast. So maybe that's why the EV warriors seem to be so popular for the tank guys.
What kind of motors do you have in your tank? 139 lbs seems very heavy!
I know about over kill in construction. My tank
was made out of 3/4 ply and the suspension is a rectangle made out of square aluminum tubing with 8 1/2 inch stainless rods 24 inches long going through it. That part (plus drive system) was 30 lbs. the wood hull is 10 lbs. each of the 24 road wheels are 1.5 lbs each. I saved some weight with conveyor belt tracks. batteries are about 50 lbs total of 18 ah for the drive system and 7 ah for the electronics/sommer speed control. the upper deck is 13 lbs for a grand total of 139 lbs. I wish I had ev warriors. It runs fast for a heavy tank after the poufs of smoke were fixed.
What motors and gear reduction are you using and at what volts do you run them at?