Best Performance in the .25-40 HP adjustable speed drive class

Smooth, responsive and highly reliable, the AS Drive with tachometer feedback lets you control speed within 1/2 percent for load changes from no load to full load. You also get a full 34 to 1 speed range and 250 percent of rated motor torque — great for starting and momentary overload conditions.

Dynamatic® AS/FAS Drives

Dynamatic® AS/FAS Drives

Dynamatic® AS/FAS Drives

Cutaway illustration reveals the durable simplicity of our Eddy Current design

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Video explaining how Dynamatic® Eddy Current electromagnetic drives work.

PLC compatible

Interfacing the Dynamatic® AS drive with a computer control system is a snap. The controller interfaces easily with PLC systems.

Designed for reliable adjustable speed performance

A look inside the Dynamatic® AS drive tells you why it’s the leader in adjustable speed drive applications.

  • Simple design
  • High performance & reliability
  • Only 4 bearings to maintain
  • Few points of friction for long-lasting equipment
  • Quick turnaround time from order to delivery
  • 2:1 longevity vs. VFD
  • Approx. 250% starting motor torque
  • No expensive spares
  • One simple controller

Built tough

Ideal for operating in harsh conditions — around plaster, cement, oil, dirt, wastewater… you name it. And the standard TEFC motor allows quick washdown without interrupting continuous operation. Plus, these drives have their own internal air-cooling fans, so there is need for complicated cooling systems that consume energy and can fail.


  • Cast iron housing
  • Brushless clutch coil
  • New digital controllers

Easy to install

Available for use with any three-phase voltage input, which means you won’t need expensive, special wiring. They are 50/60 Hz design to simplify worldwide applications.

  • Controllers only use 1% of line power
  • Controllers can be placed up to 500 feet from the drives
  • For use in hard-to-get-to locations such as pits, towers and on top of large machinery
  • Can be installed vertically without expensive modifications

Low life-cycle cost

Lowest cost solution!

  • Low installation cost
  • Elminate downtime
  • Minimal cost of maintenance

When used within the normal operating range on fans and pumps, their energy efficiency is equal to or better than other types of drives.

  • Compatible to run on virtually any 3-phase motor

  • Approximately 250% motor torque available at clutch output

  • Long, reliable life backed by 2-year warranty

  • Easy to understand, install, operate and maintain

  • Maximum production and minimum downtime

  • 0.5% speed regulation is standard

  • Suitable for harsh industrial environments

We take our commitment to high quality seriously at Dynamatic. It shows in the long life cycle our customers have come to expect from the Dynamatic AS/FAS line. We also 100% test every controller and drive before it leaves the factory, so you can count on consistent performance.

A small, simple controller

The entire SCR controller consists of one printed circuit board. It’s interchangeable among a wide horsepower range of drives to reduce your inventory and save money.

AS Drives – Dynamatic® Eddy Current, Friction & Spring Set Brakes

There are three brakes options, that can be mounted as an additional optional part, on either the clutch end or motor end of a standard horizontal AS Drive.

  1. Eddy Current Brake is an adjustable torque brake used to decelerate the drive.
  2. Friction Brake is an electromagnetic brake that uses friction to decelerate and stop the drive.
  3. Spring Set Brake is a failsafe/emergency brake to decelerate, stop and hold the drive.

Contact one of our engineers to learn if the addition brake options are right for your application.

Dynamatic® AS/FAS Drives

World’s Leading Manufacturer

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