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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. |
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On Sale! Fan-cooled A28 motors are designed for applications that require longer duty cycles and even
higher power outputs. Low profile leads enable more compact
installations. Available for 24V and 48V. |
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The mid-range F30 motors are designed for the highest performance and efficiency while still
using the less expensive ferrite magnets. |
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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.
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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 Dia. (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 |
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Drawings |
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Performance Charts |
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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 Dia. (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 |
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Drawings |
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Performance Charts |
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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.
On Sale! Fan-cooled motors
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Fan Cooled 24V |
Fan Cooled 48V |
Model |
A28-400-F24 |
A28-150-F24 |
A28-400-F48 |
A28-150-F48 |
Diameter (inches) |
3.0 |
3.0 |
3.0 |
3.0 |
Length (inches) |
7.8 |
5.1 |
7.8 |
5.1 |
Peak HP |
4.3 |
3.0 |
11.52 |
4.6 |
Stall Torque (oz-in) |
3560 |
1950 |
72602 |
2500 |
Efficiency |
83% |
80% |
85% |
82% |
Nominal Voltage |
24V1 |
24V1 |
48V1 |
48V1 |
RPM at Nominal Voltage |
4900 |
6100 |
6400 |
7400 |
Shaft Dia. (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 |
Neodymium |
Neodymium |
No Load Amps |
4.4 |
4.4 |
4.4 |
2.5 |
Resistance (Ohms) |
0.044 |
0.064 |
0.066 |
.165 |
Kt (oz-in/Amp) |
6.58 |
5.26 |
10.05 |
8.70 |
Kv (RPM/Volt) |
205 |
257 |
135 |
156 |
Weight (pounds) |
7.2 |
4.0 |
7.3 |
4.0 |
Price |
$499 |
$394 |
$499 $419 |
$394 $334 |
Pictures |
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Drawings |
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Performance Charts |
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The fan-motors have ventilation holes in the front and rear
aluminum plates to allow for flow-through cooling. The holes in the front plate
are positioned so they are not blocked when mounting the motor to a flat
surface. These motors also feature low-profile motor leads for better fit into
smaller spaces.
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.
VEX High-Voltage
Motor Controller

We recommend using the IFI VEX 48V motor speed controller with our
48-volt motors. Visit this page for
more details.
Efficiency
Getting high efficiency from a low-voltage motor is not
easy. There are many factors that effect efficiency. We have optimized each
of these factors to achieve very high efficiency in these motors.
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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 |
HP Range for 75%+ Efficiency |
0.4 to 0.9 |
N/A |
0.4 to 1.3 |
0.3 to 0.5 |
0.3 to 1.8 |
0.3 to 0.6 |
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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 |
HP Range for 75%+ Efficiency |
0.5 to 2.9 |
0.5 to 1.8 |
0.2 to 1.7 |
0.3 to 1.6 |
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Fan Cooled 24V |
Fan Cooled 48V |
Model |
A28-400-F24 |
A28-150-F24 |
A28-400-F48 |
A28-150-F48 |
Peak Efficiency (PE) |
83% |
80% |
85% |
82% |
RPM at PE |
4500 |
5500 |
6000 |
6750 |
Torque at PE (oz-in) |
300 |
190 |
510 |
220 |
Horsepower at PE |
1.3 HP |
1.0 HP |
3.0 HP |
1.5 HP |
Current at PE |
50 Amps |
40 Amps |
55 Amps |
28 Amps |
HP Range for 75%+ Efficiency |
0.5 to 2.9 |
0.5 to 1.8 |
1.0 to 8.1 |
0.6 to 3.1 |
As you can see from the above charts, the
efficiency of the motors is very high over a broad range of power.
Sprockets and Keys
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The 1/2-inch bore of our standard sprocket fits all our 3-inch
motors.
The sprocket has 9 teeth and it works with #35 roller chain. It
comes with a 1/8-inch key. |
Applications
AmpFlow motors are popular choice in applications like:
Cablecams
POV Camera Rigs
Zipline Cameras
Automatic Guided Vehicles (AGV)
Hazardous Material Handling Robots
Personal Transport Systems
Underwater Remote Operated Vehicle
Remote Exploration Robots
Telepresence systems
Robot Sports
Police/Law Enforcement Robots
Surveillance Robots
Bomb and Mine Removal Robots
Animatronics
Model cars and model boats
Our pancake motors or standard motors are typically used in
motorized bicycles and scooters.
Here are our recommendations regarding the selection of a proper reduction ratio.
Warranty
The motors are warranted to be free from manufacturing defects, and fully
operational when you receive them. AmpFlow gives no other warranty, either expressed or implied.
Warranties are not transferable. In no event shall AmpFlow's liability exceed
the buyer's purchase price, nor shall AmpFlow be liable for any indirect or
consequential damages.
Ordering
Shipments must be to a street address; we can not ship to a PO Box. Please allow 7-10 days for orders shipped
by UPS ground, 3-4 days for orders shipped by 2nd day air, and up to 14 days
for international orders.
 
We accept Visa, MasterCard, and PayPal.
Replacement fans and brushes are available here
Contact us for custom motors and volume pricing.
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