Rotary Actuators

Rotary Actuators

Servo Motor Actuators from Harmonic Drive® have many superior performance features including zero backlash, high accuracy, fast response time, high vacuum compatibility, and are available in a wide range of sizes, and hollow shaft designs. These electromechanical servo actuators are easy to use and offer quick implementation. They are compatible with most industry-standard controllers and amplifiers. Servo actuators are an assembly of a brush or brushless servo motor, zero backlash Harmonic Drive® strain wave gear, and a high capacity output bearing. These elements are contained within the housing.

The new SHA-SG Series brushless servo-actuator provides the highest torque density of any actuator in its class. Positional accuracy better than 1 arc-min and ±5 arc-sec repeatability is achieved while delivering up to 30,000 in-lb of torque. A robust cross-roller bearing allows mounting of large loads directly to the actuator without additional support. The SHA Series actuator also features a compact, hollow shaft configuration that allows design versatility for demanding applications. Features include:

  • Hollow-shaft: Inside diameter up to 65mm
  • Flat design: actuator length is shorter than its outside diameter
  • Torque to Volume Ratio:  more than 5 times that of a direct drive motor
  • Output Torque: up to 3400 Nm
  • Output bearing, gear reduction and motor winding specification to suit your needs.
  • 17bit magnetic absolute encoder
  • It is also available to order as a “motor only”
  • Now available with hollow shaft planetary gear option - HPF series Harmonic Planetary® - for higher output speeds
  • New Smaller SHA20A is now available
  • New option - low voltage winding, 48V DC to 90V DC available for same sizes

SHA-SG Series Brochure 


  

The SHA-CG Series high precision actuators are a great alternative for direct drive motors. SHA-CG actuators offer direct drive motor performance in a compact, significantly lighter package. Ideal for high precision rotary applications such as indexing turn tables, the SHA-CG offers improved rotary positioning accuracy with surface runout less than 10 microns.  Features include

  • Alternative to Direct Drive Motors
  • High Accuracy Output Bearing
  • Available with Mounting Base
  • High Torque
  • Hollow Shaft Design
  • Compact
  • Available in 4 sizes
  • Connects directly with Mitsubishi Electric's MELSERVO-J4 SSCNET/H
  • Connects directly with Sigma7 servo drives from Yaskawa

SHA-CG Series Brochure 



The FHA-C Series AC servo actuators' compact shape and hollow-shaft construction enables possible downsizing of machinery/equipment and simplifies design. Features include:

  • Thin and compact configuration
  • Hollow-shaft construction
  • High torque, high rigidity, high accuracy
  • Built-in high-rigidity support mechanism
  • Availability of a series of multifunctional control units

 FHA-C Series Brochure



The FHA-C IP65 Series servo actuators are available in four sizes: 17, 25, 32 and 40. The IP65 rated FHA-C actuator is ideal for harsh environments. With IP65 and 480V, the FHA actuator is well suited for machine tool, packaging, and wash-down applications. These rotary servo actuators utilize Harmonic Drive® precision strain wave gears combined with a performance matched brushless servo motor. Encoder options now include EnDat® & HIPERFACE®. The FHA has a low-profile form factor and features a hollow-output shaft. This hollow shaft feature may be used to pass cables, tubing or lasers through the axis of rotation.

The FHA series is designed to operate with a wide range of third-party servo drives including Bosch, Mitsubishi, Siemens, and Kollmorgen. REL Driver also compatible at approximately half speed.

FHA-C IP65 Series Brochure


The FHA-C Mini Series is a family of extremely compact Hollow Shaft Actuators that deliver high torque with exceptional accuracy and repeatability. The actuator combines a high precision Harmonic Drive® gear component with a pancake brushless servo motor. An incremental or multi-turn absolute encoder is integrated to provide high resolution velocity and position feedback. The large cross roller output bearing allows heavy loads to be mounted directly to the actuator without the need for additional support. Features include:

  • Compact form factor
  • Hollow-shaft design (for incremental encoder only)
  • Available with an Incremental or multi-turn absolute encoder
  • Robust cross roller output bearing supports high loads
  • High torque/weight and torque/volume ratio

 FHA-C Mini Series Brochure



The RSF Supermini Series is an ultra-miniature brushless servo actuator that delivers high torque and precision by combining a zero-backlash Harmonic Drive® gearhead with a high performance servo motor. The output shaft is supported by a robust 4-point contact bearing which often allows mounting of the load directly to the shaft of the actuator. Performance matched servo drives are also available to deliver the full capabilities of these high performance actuators.   Machinery and equipment designs requiring high torque with limited available space will benefit from this product. Features include:

  • Compact, Lightweight
  • High Output Torque
  • High Accuracy
  • High flex Encoder Cable
  • Optional Brake  (available for RSF-5B)

 RSF Supermini Series Brushless Servo Actuator Brochure



The RSF Mini Series includes compact and high-torque AC servo actuators with a high rotational accuracy, a shaft output combining Harmonic Drive® strain wave gearing for precision control and an AC servo motor; combined with a dedicated servo driver that fully demonstrates the performance of this RSF Series of implements. Features include:

  • Compact
  • High rotational accuracy
  • High resolution
  • High positional accuracy

RSF Mini Series Brochure 


The RSF Series is compact and includes high-torque AC servo actuators with high rotational accuracy, a shaft output combining Harmonic Drive® strain wave gearing for precision control and an AC servo motor. This is combined with a dedicated servo drive that fully demonstrates the performance of the RSF series of implements compact machines and equipment with a high rotational accuracy. Features include:

  • Compact and lightweight
  • High power
  • High positioning and high rotational accuracies

RSF Series Brochure



The RKF Series is compact and includes high-torque AC servo actuators with high rotational accuracy, a flange output combining Harmonic Drive® strain wave gearing for precision control and an AC servo motor. This is combined with a dedicated servo drive that fully demonstrates the performance of the RKF series of implements compact machines and equipment with a high rotational accuracy. Features include:

  • Compact and lightweight
  • High power
  • High positioning and high rotational accuracies

 RKF Series Rotary Actuator Series Brochure



High-powered RH Mini Series DC servo actuators were developed in order to control machinery and equipment smoothly, speedily and accurately. A high level of positional accuracy and resolution, coupled with a compact and lightweight configuration, is the basis for the supermini RH Mini Series DC servo actuators. The RH Mini Series are highly responsive DC servomotors created in pursuit of optimal magnetic circuit. These actuators can substantially reduce the time required for positioning and are supported by large-sized, high-precision bearings for large loads. Features include:

  • Compact and lightweight
  • High power
  • High positioning and high rotational accuracies

RH Mini Series Brochure


Rotary Actuator Selection ChartView More


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  1. RH-11D-100 Harmonic Drive RH Series Rotary Actuators
    RH-11D-100

    RH Size 11 Solid Shaft Output, 100:1 Ratio, 3.9 Nm Max Cont. Torque

  2. RH-14D-100 Harmonic Drive RH Series Rotary Actuators
    RH-14D-100

    RH Size 14 Solid Shaft Output, 100:1 Ratio, 5.9 Nm Max Cont. Torque

  3. RH-5A-100 Harmonic Drive RH Series Rotary Actuators
    RH-5A-100

    RH Size 5, Solid Shaft Output, 100:1 Ratio, 0.29 Nm Max Cont. Torque

  4. RH-8D-100 Harmonic Drive RH Series Rotary Actuators
    RH-8D-100

    RH Size 8, Solid Shaft Output, 100:1 Ratio, 2 Nm Max Cont. Torque

  5. RSF-11B-100 Harmonic Drive RSF Series Rotary Actuators
    RSF-11B-100

    RSF Size 11, Solid Shaft Output, 100:1 Ratio, 11 Nm Max Cont. Torque

  6. RSF-14B-100 Harmonic Drive RSF Series Rotary Actuators
    RSF-14B-100

    RSF Size 14, Solid Shaft Output, 100:1 Ratio, 28 Nm Max Cont. Torque

  7. RSF-17A-100 Harmonic Drive RSF Series Rotary Actuators
    RSF-17A-100

    RSF Size 17, Solid Shaft Output, 100:1 Ratio, 20 Nm Max Cont. Torque

  8. RSF-20A-100 Harmonic Drive RSF Series Rotary Actuators
    RSF-20A-100

    RSF Size 20, Solid Shaft Output, 100:1 Ratio, 35 Nm Max Cont. Torque

  9. RSF-25A-100 Harmonic Drive RSF Series Rotary Actuators
    RSF-25A-100

    RSF Size 25, Solid Shaft Output, 100:1 Ratio, 59 Nm Max Cont. Torque

  10. RSF-32A-100 Harmonic Drive RSF Series Rotary Actuators
    RSF-32A-100

    RSF Size 32, Solid Shaft Output, 100:1 Ratio, 98 Nm Max Cont. Torque

  11. RSF-3C-100 Harmonic Drive RSF Series Rotary Actuators
    RSF-3C-100

    RSF Size 3, Solid Shaft Output, 100:1 Ratio, 0.11 Nm Max Cont. Torque

  12. RSF-5B-100 Harmonic Drive RSF Series Rotary Actuators
    RSF-5B-100

    RSF Size 5, Solid Shaft Output, 100:1 Ratio, 0.44 Nm Max Cont. Torque

  13. RSF-8B-100 Harmonic Drive RSF Series Rotary Actuators
    RSF-8B-100

    RSF Size 8, Solid Shaft Output, 100:1 Ratio, 4.8 Nm Max Cont. Torque

  14. SHA-20A-100-CG Harmonic Drive SHA-CG Series Rotary Actuators
    SHA-20A-100-CG

    SHA Size 20, Hollow Shaft Output, 100:1 Ratio, 107 Nm Max Cont. Torque

  15. SHA-25A-100-CG  Harmonic Drive SHA-CG Series Rotary Actuators
    SHA-25A-100-CG

    SHA Size 25, Hollow Shaft Output, 100:1 Ratio, 204 Nm Max Cont. Torque

  16. SHA-25A-100-CG (100V) Harmonic Drive SHA-CG Series Rotary Actuators
    SHA-25A-100-CG (100V)

    SHA Size 25, 100 VAC Version, Hollow Shaft Output, 100:1 Ratio, 204 Nm Max Cont. Torque

  17. SHA-32A-100-CG Harmonic Drive SHA-CG Series Rotary Actuators
    SHA-32A-100-CG

    SHA Size 32, Hollow Shaft Output, 100:1 Ratio, 433 Nm Max Cont. Torque

  18. SHA-40A-100-CG Harmonic Drive SHA-CG Series Rotary Actuators
    SHA-40A-100-CG

    SHA Size 40, Hollow Shaft Output, 100:1 Ratio, 738 Nm Max Cont. Torque

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