Three-Inch High Performance 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.		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.


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

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

24V¹

48V¹

RPM at Nominal Voltage

6500

5900

5700

5600

5800

5600

Shaft Dia. (inches)

1/2

Shaft Length (inches)

2.0

Keyway (inches)

1/8

Capacitors

Magnet Type

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

3.1

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

RPM @ 24V

4900

6100

4500

6900

Shaft Dia. (inches)

1/2

Shaft Length (inches)

2.0

Keyway (inches)

1/8

Capacitors

Yes

Magnet Type

Neodymium

Ferrite

No Load Amps

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.

On Sale! Fan-cooled motors

Fan Cooled 24V

Fan Cooled 48V

Model

A28-400-F24

A28-150-F24

A28-400-F48

A28-150-F48

Diameter (inches)

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

48V¹

RPM at Nominal Voltage

4900

6100

6400

7400

Shaft Dia. (inches)

1/2

Shaft Length (inches)

2.0

Keyway (inches)

1/8

Capacitors

Yes

Magnet Type

Neodymium

No Load Amps

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

Drawings

Performance Charts

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.

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.

	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

	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

	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

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