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.

 

New 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.

 
High-Performance Electric Motors  
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.

Custom motors are available with a minimum order of 25 units.

 

Type High-Performance Mid-Range Economy
Model A28-400 A28-150 F30-400 F30-150 E30-400 E30-150
Diameter (inches) 3.0 3.0 3.1 3.1 3.1 3.1
Length (inches) 6.7 4.0 6.7 4.0 5.8 4.0
Peak HP 4.3 3.0 2.5 2.3 2.1 1.0
Stall Torque (oz-in) 3560 1950 2240 1370 1500 710
Efficiency 83% 80% 84% 82% 79% 76%
Nominal Voltage* 24V* 24V* 24V* 24V* 24V* 24V*
RPM @ 24V 4900 6100 4500 6900 5700 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 Yes Yes Yes Yes No No
Magnet Type Neodymium Neodymium Ferrite Ferrite Ferrite Ferrite
No Load Amps 4.4 4.4 2.1 2.5 3.2 2.1
Resistance (Ohms) 0.044 0.064 0.076 0.081 0.089 0.190
Kt (oz-in/Amp) 6.58 5.26 7.17 4.66 5.63 5.70
Kv (RPM/Volt) 205 257 189 287 240 237
Weight (pounds) 6.9 3.8 8.3 4.7 5.9 3.6
Price $399 $309 $259 $209 $109 $79
Pictures A28-400 A28-150 F30-400 F30-150 E30-400 E30-150
Drawings A28-400 A28-150 F30-400 F30-150 E30-400 E30-150
Performance Charts A28-400 A28-150 F30-400 F30-150 E30-400 E30-150
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* The above specifications are for 24V. The motors can also be used at 12V or 18V. The RPM is proportional to the voltage so running at 12V will result in half the no-load RPM that is shown above for 24V. The lower voltage also reduces the maximum achievable torque by 50%. The motors have also been tested and used at higher voltages resulting in higher RPM, torque, and power. 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.

 

NEW! Fan-cooled motors

Type 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 11.5* 4.6    
Stall Torque (oz-in) 3560 1950 7260** 2500    
Efficiency 83% 80% 85% 82%    
Nominal Voltage 24V 24V 48V 48V    
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 $439 $339 $439 $339    
Pictures A28-400-F24 A28-150-F24 A28-400-F48 A28-150-F48    
Drawings            
Performance Charts A28-400-F24 A28-150-F24        
Order
   

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.

* 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.

Type High-Performance Mid-Range Economy
Model A28-400 A28-150 F30-400 F30-150 E30-400 E30-150
Peak Efficiency (PE) 83% 80% 84% 82% 79% 76%
RPM at PE 4500 5500 4200 6300 5100 5000
Torque at PE (oz-in) 300 190 170 120 145 85
Horsepower at PE 1.3 HP 1.0 HP 0.71 HP 0.74 HP 0.75 HP 0.40 HP
Current at PE 50 Amps 40 Amps 26 Amps 28 Amps 29 Amps 17 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 0.4 to 1.3 0.3 to .5

 

Type 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


 

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.

Sprocket - $14      Quantity

 

 

Applications

The A28-150 and A28-400 motors are popular choices in cablecams, camera cars, POV camera rigs, zipline cameras, camera control platforms, and motorized cable cams. These motors have enough torque to drive the camera rig without the need for a gearbox. This enables the drive system to be almost completely silent - an important requirement for cablecams.

 

 

Our pancake motors or standard motors are typically used in motorized bicycles and scooters. But if you have the right gearing and you can allow a little extra time for motor cooling, our high-performance motors can result in a wild ride!

 

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 brushes are available here

Contact us for custom motors and volume pricing.

 

 

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