Robot Motors



AmpFlow high-performance A28 motors are designed to give the highest level of performance possible in a brushed DC motor. This is achieved by advanced design and the use of neodymium rare-earth magnet material.

The mid-range F30 motors are designed for the highest performance and efficiency while still using the less expensive ferrite magnets.

The economy E30 motors are designed to give good performance at the lowest possible price.


All motors on this page are available with the optional AmpFlow speed reducer.


We stock all the motors on this page. Custom motors are also available with a minimum order of 24 units.




High-Performance Economy Motors
Voltage Range 6 Volts to 18 Volts 12 Volts to 36 Volts 24 Volts to 72 Volts
Model E30-400-12 E30-150-12 E30-400-24 E30-150-24 E30-400-48 E30-150-48
Diameter (inches) 3.1 3.1 3.1 3.1 3.1 3.1
Length (inches) 5.8 4.0 5.8 4.0 5.8 4.0
Peak HP 1.6 0.7 2.1 1.0 2.7 1.1
Stall Torque (oz-in) 970 450 1500 710 1860 750
Efficiency 78% 71% 79% 76% 82% 77%
Nominal Voltage 12V1 12V1 24V1 24V1 48V1 48V1
RPM at Nominal Voltage 6500 5900 5700 5600 5800 5600
Shaft Diameter (inches) 1/2 1/2 1/2 1/2 1/2 1/2
Shaft Length (inches) 2.0 2.0 2.0 2.0 2.0 2.0
Keyway (inches) 1/8 1/8 1/8 1/8 1/8 1/8
Capacitors No No No No No No
Magnet Type Ferrite Ferrite Ferrite Ferrite Ferrite Ferrite
No Load Amps 5.5 4.4 3.2 2.1 1.4 1.0
Resistance (Ohms) 0.030 0.069 0.089 0.190 0.284 0.708
Kt (oz-in/Amp) 2.46 2.68 5.63 5.70 11.1 11.4
Kv (RPM/Volt) 549 504 240 237 122 118
Weight (pounds) 5.9 3.6 5.9 3.6 5.9 3.6
Price $109 $79 $109 $79 $109 $79
Pictures
Drawings
Performance Charts
Order



High-Performance Mid-Range
Model A28-400 A28-150 F30-400 F30-150
Diameter (inches) 3.0 3.0 3.1 3.1
Length (inches) 6.7 4.0 6.7 4.0
Peak HP 4.3 3.0 2.5 2.3
Stall Torque (oz-in) 3560 1950 2240 1370
Efficiency 83% 80% 84% 82%
Nominal Voltage 24V1 24V1 24V1 24V1
RPM @ 24V 4900 6100 4500 6900
Shaft Diameter (inches) 1/2 1/2 1/2 1/2
Shaft Length (inches) 2.0 2.0 2.0 2.0
Keyway (inches) 1/8 1/8 1/8 1/8
Capacitors Yes Yes Yes Yes
Magnet Type Neodymium Neodymium Ferrite Ferrite
No Load Amps 4.4 4.4 2.1 2.5
Resistance (Ohms) 0.044 0.064 0.076 0.081
Kt (oz-in/Amp) 6.58 5.26 7.17 4.66
Kv (RPM/Volt) 205 257 189 287
Weight (pounds) 6.9 3.8 8.3 4.7
Price $449 $344 $289 $239
Pictures
Drawings
Performance Charts
Order

1 The above specifications are for the motor's nominal voltage. The motors can also be used at lower or higher voltages. The RPM is proportional to the voltage, so running at half the nominal voltage will result in half the speed, and twice the voltage will double the speed. The maximum achievable torque is also proportional to the voltage. Shorter duty cycles are recommended for higher voltages to allow the motors time to cool. Please note that the above torque figures are the theoretical peak torques when stalled. Operating any high-performance motor while stalled will damage it.


2 Theoretical peak power is 11.5 HP. Power at the recommended short-term current limit of 200A is 9.1 HP. The current required to reach 7260 oz-in is far outside the safe operating limits of this motor. This figure is theoretical and should be used for comparative purposes only.




Efficiency



Getting high efficiency from a low-voltage motor is not easy. There are many factors that affect efficiency. We have optimized each of these factors to achieve very high efficiency in these motors.


High-Performance Economy Motors
Voltage Range 6 Volts to 18 Volts 12 Volts to 36 Volts 24 Volts to 72 Volts
Model E30-400-12 E30-150-12 E30-400-24 E30-150-24 E30-400-48 E30-150-48
Peak Efficiency (PE) 78% 71% 79% 76% 82% 77%
RPM at PE 5800 5100 5100 5000 5300 5000
Torque at PE (oz-in) 105 63 145 85 150 80
Horsepower at PE 0.60 HP 0.32 HP 0.75 HP 0.40 HP 0.80 HP 0.40 HP
Current at PE 48 Amps 28 Amps 29 Amps 17 Amps 15 Amps 8 Amps

High-Performance Mid-Range
Model A28-400 A28-150 F30-400 F30-150
Peak Efficiency (PE) 83% 80% 84% 82%
RPM at PE 4500 5500 4200 6300
Torque at PE (oz-in) 300 190 170 120
Horsepower at PE 1.3 HP 1.0 HP 0.71 HP 0.74 HP
Current at PE 50 Amps 40 Amps 26 Amps 28 Amps

As you can see from the above charts, the efficiency of the motors is very high over a broad range of power.




Replacement parts are available here.





We accept Visa, MasterCard, and PayPal.

Contact us for custom motors and volume pricing:


"That's a beautiful motor! Wow. Good work. Great price. This should become standard equipment for all large robots."
  —Edwin Wise.  Mad Scientist and author of Applied Robotics


"Very powerful. Too fast on 24 Volts even with poor batteries."
  —Mike Schreiber.  Builder of the Electri-Flyer electric bicycle.


"BattleBot participants are constantly trying to make their robots quicker, stronger and faster. With nearly four horsepower and 3840 oz-in torque, the 11.9-pound A40 motor is ideally designed for our larger robots. Since power is often the deciding factor in BattleBot competitions, more and more participants are selecting these motors to power their robots with a lightweight, high-efficiency motor that provides plenty of power on demand."
  —Trey Roski.  CEO of BattleBots.


"As the first motors designed specifically for robotic combat, these motor perform fabulously! They combines incredible power and some of the best features you could ask for when looking for a high-end motor for a BattleBot. They are the most powerful and finest constructed DC permanent magnet motors that I've ever used. I chose this motor for the weapon motor in Nightmare and I am definitely a very satisfied customer!"
  —Jim Smentowski.  BattleBots Champion (Nightmare, Backlash)


"This motor packs a lot of power into a light-weight package. They give Minion the power it needs and I still have weight to spare!"
  —Christian Carlberg.  BattleBots Champion (Team Cool Robots)


"Get the best motors you can afford. Good motors are the foundation upon which all else rests. People can win with hokey electronics or even with inoperative weapons, but good motors make good robots."
  —William Gurstelle.  Author of Building Bots: Designing and Building Warrior Robots


"We were extremely pleased with the performance of the motors in our middleweight Heavy Metal Noise at BB 4.0. The motor supplied an insane amount of energy to our kinetic disk weapons. Time to spinup was minimal and after combat the motor was never more than mildly warm to the touch."
  —Jay Johnson.  BattleBots Competitor (Big Bang Robotics)


"I've been building robots as a hobby for about 30 years and this is definitely one of the best motors (power, weight, cost, quality), that I've ever encountered. Since I've never built a 'BattleBot' before, I decided to focus most of my attention on other aspects of the design and having this motor meant that I didn't have to spend many hours 'tweaking' an inferior motor just be competitive."
  —Billy Moon.  BattleBots Competitor


"I can attest to their super high quality of craftsmanship and design. We tested them with a few different controllers and monitored the results using a Tektronix digital scope and a digital ammeter. Results: This is the largest motor we have tested and amazingly it had the cleanest feedback signal of any motor yet. Generally the higher the quality of motor mechanics, windings, brush and commutator, the cleaner this signal is. This means these motors are less likely to blow a speed controller due to transient voltage spikes.
  These motors are VERY well built. We saw no appreciable heat up in the testing we did. We did a lot of stall and near stall testing. These are amazing motors and are ridiculously powerful."

  —Alexander Rose.  BattleBots Champion (Toro, T-minus, Matador)