This is the same motor as the Magmotor S28-400, used for many years by champion robot builders. Exactly the same motor, made by the same factory, just under a different name to avoid confusion with other motors.

An incredible amount of power in a small package. You quite simply will NOT find a more powerful motor of this size. This motor is a must-have for the serious competitor. The improved Neodymium magnets and sturdy construction make the A28-400 the optimal choice for combat robotics.

3" Diameter, 6.7" long
1/2" diameter shaft with 1/8" keyway, 1.75" long
24V (can be run higher)
4.5 horsepower
3720 oz-in Torque
Max current 390 Amps
83% Efficiency
4900 rpm
6.9 lbs
Neodymium magnets

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 Tech Specs and Tips

 3D IGES File

 Solidworks File

3/30/2010

Josh H Bentley

Ampflow A28-400 Magmotor

The A28-400 is the same motor as what many people have come to know as the S28-400, but the name and label have been changed to avoid confusion with other non-robot Magmotors.

An incredible amount of power in a small package. You quite simply will NOT find a more powerful motor of this size. This motor is a must-have for the serious competitor. The improved Neodymium magnets and sturdy construction make the A28-400 the optimal choice for combat robotics.

3" Diameter, 6.7" long
1/2" diameter shaft with 1/8" keyway, 1.75" long
24V (can be run higher)
4.5 horsepower
3720 oz-in Torque
Max current 390 Amps
83% Efficiency
4900 rpm
6.9 lbs
Neodymium magnets

6/20/2009

Dan

This motor has SO MUCH POWER for it's size, it's ridiculous. It's an "industry standard" in battlebots, from 60 to 220 lbs. It easily spun a 50 lb steel drum on Copperhead up to 3700 RPM in about 15 seconds on a 1:1 pulley and V-belt system. Absolutely the best.

5/14/2009

h8ck3rs

F'n awesome

This motor is so awesome. Just hooking it up to a 12 volt battery will make it jump enough to throw it off the bench. Be sure to give it a nice burn in before you put any real load on it. I never use it in reverse so I just burn it in one way which works fine. Pretty scary cleaning it, putting the assembly back together I carefully considered if I was going to lose a finger or not. Neodymimum FTW. Keeping the motor cool can be a problem with extended runs.