BN42 Silencer Series Brushless DC Motors

Quiet, Brushless Motors

Silencer® brushless DC motors provide smooth, efficient operation and increased speed ranges. Utilizing bonded neo magnets, our BN series motors provide excellent value with their low cost and high torque. Each frame of the BN motors is available in four different lengths with a variety of electrical options to meet a wide range of commercial and industrial operating specifications.

Reliable, Low-cost Operation

The compact BN motors are well-suited for applications demanding low audible noise and long life. An aluminum housing protects the unit in rugged applications and environments. Typical options include electronic drives, encoders and gearheads, as well as Hall effect, resolver and sensorless feedback.

For more information about how Moog's Silencer Series brushless DC motors can be tailored to fit your specific application, contact our motors experts.


  • Inside rotor construction for quick acceleration
  • 8 pole motor standard, 4 pole motors optional for high speed applications
  • Lengths available – 2.3 - 5.3 inches
  • Diameter – 4.15 inches
  • Continuous torques from 144 to 519 oz-in
  • High energy neodymium magnets
  • Safe, arcless operation
  • High speed capability – up to 20,000 rpm
  • High torque per dollar ratio


  • Operation at any single speed - not limited to AC frequency
  • Motor life is not limited to brush or commutator life
  • An essentially linear speed / torque curve
  • Efficient operation without losses associated with brushes and commutation or armature induction
  • Precise, variable speed control
  • Extremely quiet operation
  • Long-life operation

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Typical Applications

  • Medical equipment - pumps, blowers, electric scooters and wheelchairs
  • Automatic door and window openers
  • Computer-controlled embroidery machines
  • Scanners
  • Packaging equipment and printing products
  • HVAC equipment (air handling)
  • Robotic tape storage and retrieval
  • Semiconductor handling and insertion machines
  • Actuators