@RCStartToFinish This is what I am using on Magnus. They are a little pricey though. Check out the operating specs in the manual to be sure it will handle your needs.

Victor 883

robotmarketplace.com

Wont work my motor is only 16a not 40

Yes - it will work for you.
The 16A of your motor is the amount of current it draws. (you need to check also what it's stall or peak current draw is - probably double = 32A). You want to have a motor controller that exceeds that peek current draw in capability. Otherwise you will burn-out the controller by trying to draw more power than the controller can safely provide.

if it says 16a then double it for peak(max) amps