Accelerate Fast With The New Fastact J Servomotors

Moog is pleased to announce the introduction of a new series of servomotors called Fastact J Series Servomotors. These are electronically commutated synchronous AC motors with permanent magnets that are for highly dynamic servo applications where positioning times of 15 msec or less are the norm. This complete family of servomotors has very high angular accelerations which differentiates it from the competition.

Superior Motor Dynamics Reduces Costs and Improves Cycle Time

 The new Fastact J Series Servomotor design is the result of working with high performance machine builders to combine a very low inertia rotor with an electromagnetic design having exceptional overload capacity. It uses a fully laminated, weight and inertia optimized rotor to provide a significant inertia reduction over conventional solid rotor designs. It is able to achieve a high overload capacity through the use of high-energy rare magnets, and an efficient thermal construction.  The result is an increase in the effective torque available to accelerate and decelerate the load, enabling higher dynamics and improved cycle times. The performance summary is in Appendix A.

  1. Metal CE/UL compliant connectors

  2. Proprietary stator design

  3. Rare earth magnets

  4. Sealed life-time lubricated bearings

  5. Lightweight extruded aluminum housing

  6. Fully laminated low-inertia rotor

  7. Feedback device

For over two decades, Moog has been involved in the design and supply of brushless servomotors offering the highest dynamics and reliability.  Using a modular design and supported by a variety of options, Moog’s application staff are capable of supplying fully customized J Series Servomotor solutions.

Flexible Module Design Ensures Easy Integration

 The Fastact J Series Servomotor is available with the following options:

  • Cooling Options: natural convection, fan cooled or water cooled
  • Integral holding brakes
  • Resolver or encoder based feedback
  • Various Connector options
  • Plain or slot & key type shafts
  • Teflon shaft seal (IP67 sealing)
  • Custom motor windings
  • Custom shafts and flanges
  • Custom frameless designs
  • Custom designs for unique environments including high temperature, high shock levels, oil and water immersion, areas with explosive gases and areas with elevated radiation levels.

Air cooled JHC5 with straight connectors |Water cooled JH

All Moog servomotors are manufactured in-house and utilize tight machining tolerances, precision balancing and thorough production testing to guarantee a long service life. The use of high reliability feedback devices, sealed lifetime lubricated bearings, precision balanced rotors (Class G 6.3 of ISO 1940), reduced run-out machining tolerances (Class R of DIN 42955-R) and IP65 construction combine to extend service life.

Successful Applications

The Fastact J Series Servomotors can be successfully applied to many applications and markets.

Source: Netstal Maschinen AG
High Performance Injection Molding Machine

Benefits for Injection Molding Machine Applications

  • 20-30% cost reduction on servomotor and servodrive combination because of higher efficiency (e.g. same performance and similar pressure deviation achievable with a smaller motor on injection axis)
  • Higher injection speeds possible thanks to better Inertia to Motor-Torque ratio
  • Possibility to reduce wall thickness because a shorter filling time is achievable
  • Improving cycle times because of reduced cooling times (smaller wall thickness) and shorter clamping movement (higher acceleration, maximum speed and deceleration)
  • Improved mold protection because of shorter deceleration times after detection of excessive external forces while clamping

Benefits for Die Casting Machinery

Specific die casting process properties including a sudden change of state (liquid to solid) and the good thermal conductivity of the processed material, require short filling times and rapid deceleration. Meeting these requirements will improve the quality of the part (surface and structural consistence, degree of filling) and reduce the size and wall thickness of the part, offering significant benefits to the user in quality and reduced part cost.

The use of a Fastact J Series Servomotor with their outstanding maximum torque to inertia ratio will achieve increased acceleration, cast speed and deceleration. As a result, the application can gain the following advantages:

  • Increased part-quality due to shorter deceleration time and higher cast speed prevents the material from unintended changes of state
  • Shorter cooling time because of thin parts as well as unheated casts (both due to the ability of shorter filling times) results in shorter cycle times
  • Thin walled parts reduce parts costs due to lower weight
  • Reduced risk of “over casting”; deceleration of the axis is started before the cast is completely filled; with shorter deceleration times, the overcast protection has less impact on filling time (i.e. shorter filling times); in addition, improved part quality is achieved

Appendix A: Performance Summary of Fastact J-Series Motors

Motor Type Decription
Example JSx3

  • J = Fastact J Series
  • S = Standard  or H = High Dynamic
  • X = Cooling Options (Natural convection, Fan cooled, Water cooled)
  • 3 = Motor size 70 mm (2.75 in) flange




Andrew Barrett, B.E.(electrical), M.Eng.Sc. (control electronics), MBA, is Product Line Manager for Moog’s Industrial Servomotors. He brings 17 years of experience in engineering, operations and product line management, gained during a career with several multinational companies.

Manuel Niedermann, B.E.(electrical), MAS (business administration and engineering), Project Manager for Application Engineering of Electromechanical systems. He brings 8 years of experience in engineering and project management. His previous experiences have been in the semiconductor and textiles machine manufacturing industries.