Copper Motor Rotors Give Army Trucks a Boost

March 8, 2007
Four 140-hp electric motors power the latest generation of U.S. Army heavy expanded mobility tactical trucks.

Julie Kalista
Online Editor

Oshkosh HEMTT A3 with ProPulse
They use ac induction motors with die-cast copper rotors on each of four axles. The 520-V motors are powered by a 400-hp diesel engine, making a hybrid drive system that can move the 35,000-lb. vehicles and run a 335-kW generator.

Called ProPulse and manufactured by Oshkosh Truck Corp., Oshkosh, WI, the hybrid drive decreases emissions and increases fuel economy by up to 40%, according to the manufacturer. The drive is also configured for commercial refuse vehicles. OshKosh claims the drives lower life-cycle costs and lower interior and exterior noise.

Reliance Electric, Greenville, SC, manufactures the electric motors and the die-cast copper rotor technology is the only way to meet the strict military requirements. The requirements include the ability to climb a 60% incline while carrying a full payload. The new HEMTT A3 is also 3,000 lbs. lighter than its predecessor, but can still carry a 13-ton payload. The truck is can unload cargo from a C-130 aircraft without any extra quipment.

Copper motor rotors are more efficient than traditional aluminum rotors because copper is a better conductor of electricity and has lower resistance. So, motors using copper are smaller and stay cooler. "This induction motor has the highest power density possible today," says Reliance's director of advanced technology. The Army Research Laboratory sponsors the research program.

More Information:
OshKosh Truck Corp.
Reliance Electric

Sponsored Recommendations

Altech's Liquid Tight Strain Relifs Catalog

March 13, 2024
With experienced Product Engineers and Customer Service personnel, Altech provides solutions to your most pressing application challenges. All with one thought in mind - to ensure...

Industrial Straight-Through Cable Gland

March 13, 2024
Learn more about Altech's cable glands and all they have to offer for your needs!

All-In-One DC-UPS Power Solutions

March 13, 2024
Introducing the All-In-One DC-UPS, a versatile solution combining multiple functionalities in a single device. Serving as a power supply, battery charger, battery care module,...

Smooth Sorting with SEW-EURODRIVE!

Feb. 22, 2024
Sorting systems are essential when it comes to warehouse automation, material handling, and distribution. SEW-EURODRIVE’s automated sorting solutions increase capacity, reliability...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!