The A-150 is the same motor as what many people have come to know as the S28-150, but the name and label have been changed to avoid confusion with other non-robot Magmotors.
This
is a smaller, lighter version of the popular S28-400. Same diameter
and powerful magnets, just in a shorter, lighter package! And would
you believe a whopping 3 horsepower from a 3.8lb motor?
3"
Diameter, 4" long
1/2" diameter shaft with 1/8" keyway, 1.75" long
24V (can be run higher)
3 horsepower
1970 oz-in Torque
Max current 285 Amps
82% Efficiency
6000 rpm
3.8 lbs
Neodymium magnets
Proved in countless successful bots, this motor is ridiculously powerful. Also important for combat, it is very tough and can handle some major abuse. In extreme shock loads the magnets can separate from the can or shatter. I would really like to see replacement magnets available for purchase.
5/11/2009
Jim
Amazing
This motor continues to amaze me at its power in a relatively small package. I used 6 of these in combination with the Team Whyachi gearboxes in my most recent heavyweight robot, and they are PERFECT for my application. Compact and durable, TONS of torque and they can take a good amount of abuse.
5/14/2009
Matt Tavares (Blender)
Blender Tested and Approved
We have used these in the Blender since ver 2 (ver 6 just competed) and haven't looked back since. These motors are phenomenal. As always with any motor, make sure you won't be torque stalling it.
5/20/2009
Team OverKill
hard to kill
I have used the S28-150 motor for many years in 30 lbs bots. While I have broken a few, they have also delivered several national championships and medals at RoboGames. Its hard to imagine a tougher motor.
Tech Specs and Tips 
IGES File (courtesy of Kevin Barker) 
SolidWorks File (courtesy of Kevin Barker) 
hard to kill
S28-400 Magmotor
Magmotor Mount 1/2 inch thick - with heatsink
Magmotor Mount 1/2 inch thick - no heatsink
Ampflow E-150 motor
TW TWM3M Gearbox
Replacement Brush Set for 3 inch Magmotors - set of 4
Replacement Caps and Insulator Set for 3 inch Magmotors