Cube Torque Brush DC Motors


Our family of miniature permanent magnet cube torque brush DC motors contains motors available in .75 and 1 inch frame sizes. These motors are designed to accommodate a wide range of applications including direct drive servo systems, recorder drives, holding torque and high torque-low speed control systems. It is a rapid response motor at all operating speeds because of its high torque-to-inertia ratio and low self-inductance. Torque increases directly with input current for linearity. As a direct servo drive, it offers high resolution. Its cubical shape allows for weight and space savings and ease in mounting.

Cube motors are often used in applications where high torque is required, but the available space is limited. Cube motors lend themselves to easier mounting than cylindrical motors in many applications and are easier to lock into an envelope.

Moog offers a choice of Alnico or Samarium Cobalt magnet materials to satisfy most any requirement. These rare earth magnets produce a higher magnetic energy per unit volume than most commercially available permanent magnets. Alnico magnets provide enhanced temperature stability while Samarium Cobalt magnets offer high energy with good, stable performance.

We’re tooled for hundreds of designs with different windings, end caps and other options including gearheads, brakes, resolvers, encoders and potentiometers. Most designs can easily be adapted to meet different requirements. We can also provide custom engineering services.

Details, Features, Product Specifications


  • 4 pole 13 bar motors – 2 brushes standard and 4 brushes available
  • Stainless steel shafts for durable, rugged wear
  • Meets MIL-SPEC 810
  • Standard nickel plated housing resists corrosion in harsh environments
  • Peak torques from 1.0 to 20 oz-in
  • Optional gearheads, brakes, resolvers, encoders and potentiometers available
  • Available in .75 and 1 inch frame sizes:
    - Model 21 – 1 x 1 x 1 inches
    - Model 22 – 1 x 1 x .75 inches
    - Model 23 – 1 x 1 x 1.35 inches
    - Model 24 – 75 x .75 x .75 inches
  • Silver alloy brushes
  • Speeds up to (7500) rpm
  • Variety of windings available
  • Gold plated terminals
  • Gold alloy commutator
  • Shaft can be modified with front and rear extensions, integrated gear or a pinion


  • High torque-to-inertia ratio in a small package
  • Rapid response at all speeds
  • Cartridge brush is easily field-replaceable
  • Skewed rotors provide minimum cogging torque
  • Gold-clad commutator for long life
  • Rare earth magnets provide higher performance than standard permanent magnets
  • Cubical shape provides weight and space savings and easy mounting
  • Torque increases directly with input current for high linearity as a direct servo drive
  • Low self inductance


  • Avionics - cockpit instrumentation (altitude, latitude) and displays (indicators and instruments)
  • Robotic control systems
  • Military targeting / fire control systems
  • Sighting systems
  • Missiles
  • Military actuators
  • Direct drive servo systems
  • Medical equipment