Dynapar - Rotary Feedback products. Innovation, Customization, Delivery.

Innovation, Customization, Delivery

Dynapar encompasses the broadest line of trusted brands in motion feedback control, including Dynapar encoders and Hengstler brand incremental encoders and absolute rotary encoders, Northstar heavy-duty magneto-resistive and Heavy-Duty optical encoders and high-performance Harowe brand resolvers. Only Dynapar feedback solutions offer these world-class rotary feedback brands from one Global Supplier with 3 day delivery on most models for customer peace of mind.

Joliet Technologies is the preferred Dynapar Integrator for the Chicagoland area.

Series R25 - Mill Duty, HOUSED ResolverSeries R25 – Mill Duty, HOUSED Resolver

Quick Specs…

  • Rugged aluminum housing with IP-65 protection rating
  • Ideal for high temperatures (up to 200C), high shock environments
  • Standard MS-style connectors
  • Flange- and servo-mount styles
  • Excellent noise immunity

Overview / Design Principle:

The Harowe R25 heavy duty brushless resolvers are designed for reliability in adverse operating conditions. Resolvers are the better choice over encoders for applications that involve very high temperature, vibration and shock and/or dirty environments. R25s will quickly recover their cost by eliminating frequent downtime caused by less robust transducers. You can trust the R25 to operate reliably 24 hours a day, 365 days a year in the worst industrial environments. Unlike similar duplex-bearing packages, the R25 uses a front-and-rear bearing arrangement. This provides from two to three times the radial load bearing capacity and up to ten times the L10 life of a package with duplex bearings. The increase in load bearing capacity applies equally to static, dynamic, and shock loading.

Features and Benefits:

  • 2.5 inch nominal size
  • Shielded, spaced-support bearings (Type ABEC1) provide up to 10X the life of duplex bearings
  • Accuracy grades from +/-2 to 20 arc min
  • Up +125°C continuous duty operating temperature rating
  • Corrosion resistent aluminum finish
  • Withstands shock to 200g and 40g Vibration resistance


Motor commutation and positioning; available in 1 – 5.5 inch diameter for all motors; also used in commercial aviation, factory automation and general industrial applications.


Series R25
Nominal Size (OD): 2.5 inch
Mounting System: Flange/Servo
Flux Shield Technology: Yes
Shaft Size: 0.3745 inch (9.51 mm)
Input Volts (rms): 2 to 8
Input Frequency (Hz): 2K to 10K
Transformation Ratio: .25 to 1.0
Resolver Speed: 1X, 2X or 3X
Electrical Error: ±10 arcmin
Bearing Load Ratings: 303 lb (static), 741 lb (dynamic)
Max. Bearing Radial Play: .0002 to .0005 in
Bearing Type: Type ABEC 1
Shock Vibration Resistance: Shock: 200g, Vibration: 40g
Operating Temperature: Up to 125°C
Housing Material: Aluminum
Enclosure Rating: NEMA 4 (IP65)

Available Specifications:

Related Products & Resources:

For additional information or to receive a full-line catalog, contact your Dynapar representative at 1.800.873.8731 or visit their web site at: www.dynapar.com
Headquarters:1675 Delany Road • Gurnee, IL 60031-1282 • USA
Phone: 1.847.662.2666
Fax: 1.847.662.6633
Email: custserv@dynapar.com or dynapar.techsupport@dynapar.com
© 2009 Dynapar Corp. Printed in U.S.A. • Feedback Quick Reference Guide P/N# N-FLB130 (11/09) 5M

Call Joliet Technologies TODAY 

If you have any questions concerning Dynapar products, feel free to contact us:
Phone (815) 725-9696,
Toll Free (866) 492-9888,
Fax (815) 725-9393 or
E-mail info@joliettech.com

Joliet Technologies custom packages, integrates and engineers AC Variable Frequency Drives (VFD), DC Variable Speed Drives (VSD) and AC Drive Controllers using top of the line manufacturers, like ABB, Emerson-Control Techniques, Siemens and Saftronics (Fincor). Our custom drive packages are built to your specifications for your application. We specialize in large horsepower drive systems (500Hp and above). Call us at (815) 725-9696 or fax us at (815) 725-9393 or e-mail us or fill out an RFQ with your requirements. Serving the greater Chicagoland area and the World.