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 HSD44Series HSD44

Quick Specs…

  • Sealed against dust, oil, grease, liquids, vapor, and mud
  • Designed for high shock and vibration applications
  • Electrically isolated from motor shaft
  • Rugged cast-aluminum housing
  • Advanced ASIC technology and optics
  • Easy, hex wrench installation
  • -40° C to +100° C operation
  • 2 Year Warranty

Overview / Design Principle:

Even electric motors in the harshest environments require feedback to ensure smooth speed control. In the past, engineers have applied encoders and sensors designed for standard industrial environments into these extremely harsh environments, impacting system reliability and increasing life-cycle costs. NorthStar, the first name in heavy-duty encoders, has the solution.

The heavy rail proven NorthStar HSD44 series optical encoder was designed to be a survivor. This anodized aluminum encoder can survive high levels of shock and vibration, wide temperature extremes, and operating environment contaminants. The HSD44 can withstand the harshest outdoor environments and the toughest industrial applications.

The 1024 pulses-per-revolution (PPR) are provided by a rugged, stainless steel disk, which is read from a specially designed optical sensor. An enormous 0.025″ sensor gap reduces sensitivity to shock, vibration, and motor bearing wear. The counter-spiral shaft-coupler provides a flexible mount that eliminates resonance throughout the operating range and will not fatigue under vibration. Electronics are condensed down to a single ASIC, reducing the likelihood of electronic component failure.

The NorthStar HSD44 is designed for end-of-motor application. Adapter plates are available for common motor styles, and custom adapter plates can be created to fit any application.

Features and Benefits:

Mechanical and Environmental

  • Highly resistant to shock and vibration
  • Flexible shaft coupling
  • Tough, stainless steel optical code disk
  • Wide, 25 mil sensor gap
  • Double shaft seal protects encoder internals from the environment


  • Electrically isolated coupling eliminates damage from induced motor shaft current
  • Hi-Reliability – Single ASIC design for sensors, amplifier, and comparators reduces design complexity


Standard Operating Characteristics

Code: Optical Incremental
Pulses per Revolution: 1024 PPR. Others at Special Order
Phasing Sense: A leads B for Counter-Clockwise rotation (CCW) viewing the shaft clamp end of the encoder
Quadrature Phasing: 90° ± 15°
Symmetry: 180° ± 18°
Index: 180° ± 18°


Input Voltage Requirement: 5-30 Volts VDC
Current Requirement: 50 mA typical plus not including output loads
Output Signals: 5-30Volts DC
Frequency Response: 0 – 125kHz Data & Index
Electrical Immunity: 50 Meg Ohm minimum encoder shaft/frame to all connection leads
Connector: 18″ pigtail or 18″ pigtail with MS connector


Shaft Speed: 6,000 RPM; Maximum
Mounting Configuration: Hollowshaft mount
Housing Material: Black anodized aluminum aloy
Available Bore Sizes: ????
Bore Runout: +- 0.0005 TIR at midpoint ?????????????????????????


Operating Temperature Range: -40°C to +100°C
Storage Temperature Range: -40°C to +100°C
Humidity: to 98% RH (non-condensing)
Shock & Vibration: Axial: 12G peak @ 12,000 Hz
Vertical: 30G peak @ 12,000 Hz
Horizontal, perpendicular to axis: 10G peak @12,000 Hz

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.