Low-Cost Brushless Pancake Resolvers

Brushless resolvers provide accurate position and velocity feedback as well as commutation in precision equipment, without the structural or temperature restrictions imposed by other electronic feedback devices. They are resistant to the shock and vibration levels often encountered in industrial and instrument applications. These low-cost brushless resolvers are available in standard sizes, or with custom modifications. Available in size 15, 21 and 22, these rugged, reliable resolvers are ideal for demanding environments. Pancake brushless resolvers are supplied as separate rotor and stator assemblies, which are then mounted directly in the user's system. Since the energy is transmitted into and out of the rotor assembly by the means of electromagnetic fields, no slip rings and brushes are necessary, reducing the cost and increasing the reliability of these devices.


  • 1, 2, 3, 4 speeds standard; others available
  • Ideal for brushless dc motor commutation
  • Compact design
  • Mounts directly on motor shaft - no coupling devices needed
  • No brushes or contacts
  • High reliability: long-life design - no bearings or electronics
  • Compatible with A / D converters
  • 1,200 – 10,000 Hz frequency range standard
  • Low electrical noise
  • Ruggedness in demanding environments: no glass discs or optics to fail
  • Low cost
  • Custom modifications available

Size Options

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Typical Applications

  • Brushless DC servo commutation, position, and velocity feedback
  • Robotics and factory automation
  • Machine tools
  • Material handling equipment
  • Medical instrumentation
  • Packaging equipment