As of March 26, 2010 Joliet Technologies is no longer representing the Avtron line of products.

We do however represent the Dynapar line of Rotary Feedback Products.

Avtron – Tachs, Tachometers, Encoders, Rotary Pulse Generators

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

Tachs, Tachometers, Encoders, Rotary Pulse Generators 

Motors with Brakes

Installing Avtron Encoders for Brake Motors

M285 on AC motor with brakeM285 on Siemens AC Motor with Integral Stearns Brake.
(Click here to view M285 Brochure or Instruction Sheet.)

Avtron Encoders may be installed on brake motors with little difficulty. The first option is to use an M285 SMARTachTM with its 8.5″ FC flange mount and install it to the motor as shown in the picture. Since this unit has an 8.5″ FC flange on its outboard side, the brake can be mounted to the tach with its installation bolts going through the M285 and into the motor frame. Deflection of the motor shaft will occur when the brake is applied. With the M285 rotor attached to the motor shaft near the motor bearing, minimal deflection is seen by the rotor so there is no danger of exceeding the air gap between the rotor and sensor within the M285.

The second solution is to use a through shaft brake and mount an M3 Universal Encoder to the end of the shaft outboard of the brake. Since the encoder floats with the shaft, any deflection during braking will not affect encoder performance. Since the  M3 Universal Encoder mounts to the shaft, a stamped steel brake may be used since there is no need for a machined surface on the brake for an encoder. Avtron saves you money on the brake as well!

M685 on motor with brake.M685 on GE CD6000 Frame Motor with Brake Wheel.
(Click here to view M685 Brochure or Instruction Sheet.)

If you are working with motors that use band brakes, Avtron shaft tachs may be used to simplify the installation and alleviate alignment issues and expensive foot mount brackets. We can provide a custom stub shaft that mounts to the end of the motor shaft within the brake drum. The shaft would be made long enough to allow room for the encoder to mount with an anti-rotation bracket to hold it steady. An example of this is shown in the picture where an M685 SHAFTachTM is mounted minus the anti-rotation bracket which is installed when the motor is mounted on its base.

SMARTachTM and SHAFTachTM are trademarks of Avtron Manufacturing, Inc.

Call Joliet Technologies TODAY 

If you have any questions concerning Avtron’s Tachs, Encoders, and Pulse Generators, please contact us by:
Phone (815) 725-9696,
Toll Free (866) 492-9888,
Fax (815) 725-9393 or

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.