Northrop Grumman expands 'Silencer' line of quiet and rugged brushless DC motors

MARCH 26, 10:12 EST
BLACKSBURG, Va. -- An expanded line of high-performance Silencer brushless DC motors for applications that require low audible noise, long life, and high torque is available from Northrop Grumman Corp., company officials announced March 25.

The Silencer motors, which include a high-speed version in the 34 frame size (BN34) and a high-energy version in the 23 frame size (BN23), are from designers at the Poly-Scientific business unit of the Northrop Grumman Component Technologies sector in Blacksburg, Va.

The high-speed BN34, which offers speeds as fast as 20,000 rpm, is for centrifuge applications and high-speed fans and pumps, company officials say. An aluminum housing protects the unit in severe operating environments. The motor's inside rotor construction allows for quick acceleration and high speeds.

The Silencer high-energy BN23, which offers continuous torque ratings up to 70 oz-in, is for medical equipment, packaging machines and semiconductor handling applications. An aluminum-finned housing protects the unit in rugged applications and dissipates heat from the motor. It uses rare-earth magnets with an energy product in excess of 40 MGOe.

The Silencer(TM) motor line has continuous torque ratings from 2.4 to 519 oz-in. and provides quiet, efficient and smooth operation. Options include encoders, gearheads, resolver and sensorless feedback. The brushless motors are matched with the Silencer(TM) drives for best system performance.

For more information contact Northrop Grumman Poly-Scientific by phone at 540-552-3011, by fax at 540-953-1841, by post at 1213 North Main St., Blacksburg, Va. 24060, or on the World Wide Web at

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