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Fail-Safe Multiple Disc
Spring Set Electric Brakes (FEA)

fail-safe-brake-fea

Fail-Safe electric brakes / electric motor brakes are a reliable, spring applied, positive acting brake that quickly starts a wide range of equipment.

Designed and manufacturing with extreme precision, these electric brakes (and electric motor brakes) have been thoroughly tested to deliver proven, dependable performance in many diverse applications - from heavy-duty machine tools to fragile assembly and packaging equipment.

Electrically operated, the brake's coil is sealed within a stationary housing which is supported on ball bearings.

A powerful electromagnetic force disengages the disc pack unit to provide a low-drag neutral. Internal compressive forces are contained within the brake and are not transmitted through the bearings. The radial magnetic flux path provides maximum torque throughout the life
of the unit.

A significant portion of Carlyle Johnson Machine Co's production is devoted to the design and manufacture of special electric / electric motor brakes and integrated systems designed to specific user requirements. If you need specialized engineering solutions we have the experience and skills to meet your transmission challenge.

Specifications / Dimensions

All models offer 100 or 24 D.C. volts. All Fail-Safe Coils will operate at rated voltage ± 10%.
Old part designation was FEMA. Dyn = Dynamic. St = Static. Models represent clutch numbers
Model Dyn. Torque (lb. ft.) St. Torque (lb. ft.) A B C Min. Axial Position
D		 Bores Keyway Watts
FEA-0375 6 12 3.79688 2.56250 4.06250 .37500 3/4 or 7/8 3/16 x 3/32 40
FEA-0425   12 4.35938 2.75000 4.62500 .31250 1 or 1 1/8 3/16 or 3/32 40
FEA-0475 25 50 4.28213 3.06250 5.18750 .43750 1 1/4 or 1 3/8 1/4 or 1/8 50
FEA-0625 50 100 6.35938 3.62500 6.75000 .50000 1 3/4 or 1 7/8 3/8 or 3/16 50
FEA-0800 120 240 8.09375 4.06250 8.50000 .50000 2 or 2 1/4 7/16 x 7/32 80
Standard hardened Electric Clutch Cups are designed especially for use with electric brakes and electric motor brakes. Available with internal or external flanges and provided with mounting bolt holes, these cups can be quickly adapted to various types of driven or driving members. We offer these cups as an economical and simple way of adapting our clutches and brakes to your conditions.
Internal Flange
Drive Cup # A B (b.c.) Screw Size Holes C D E F Slots
EMA-0375-106-30 4.250 - 4.248 3.067 - 3.057 1/4 3 2.017 - 2.015 4.188 1.188 .188 8
EMA-0425-106-30 4.750 - 4.748 3.630 - 3.620 1/4 3 2.517 - 2.515 4.688 1.250 .188 8
EMA-0475-106-30 5.250 - 5.248 3.942 - 3.932 5/16 3 2.517 - 2.515 5.188 1.375 .250 8
EMA-0625-106-30 6.812 - 6.810 5.317 - 5.307 3/8 4 3.767 - 3.765 6.750 1.656 .313 8
EMA-0800-106-30 8.562 - 8.560 6.255 - 6.245 1/2 4 4.517 - 4.515 8.500 1.703 .313 12
EMA-0950-106-30 10.062 - 10.060 8.067 - 8.057 1/2 4 5.517 - 5.515 10.00 1.781 .313 12
EMA-1150-106-30 11.812 - 11.809 9.817 - 9.807 1/2 6 8.017 - 8.015 11.75 2 .313 12
External Flange Cup for Model FEA 0265 available upon request.
External Flange
Drive Cup # A B (b.c.) Screw Size Holes C D E F Slots
EMA-0375-106-20 5.625 - 5.623 4.880 - 4.870 1/4 3 3.814 - 3.812 4.188 1.188 .250 8
EMA-0425-106-20 6.125 - 6.123 5.380 - 5.370 1/4 4 4.314 - 4.312 4.688 1.250 .250 8
EMA-0475-106-20 6.875 - 6.873 6.005 - 5.995 5/16 4 4.814 - 4.812 5.188 1.375 .250 8
EMA-0625-106-20 8.500 - 8.498 7.692 - 7.982 3/8 4 6.377 - 6.375 6.750 1.656 .313 8
EMA-0800-106-20 10.625 - 10.623 9.630 - 9.620 1/2 4 8.095 - 8.093 8.500 1.781 .313 12
EMA-0950-106-20 12.250 - 12.248 11.130 - 11.120 1/2 4 9.533 - 9.531 10.00 1.781 .313 12
EMA-1150-106-20 14.248 - 14.247 13.005 - 12.995 1/2 6 11.253 - 11.250 11.75 2 .375 12

In addition to our standard Multiple Disc Electric Brakes (EMA), our engineering department can custom design and manufacture a new component to meet your specific requirements. If you have further questions or would like to discuss your specific needs, please contact us.

Images & Drawings

fail-safe-brake-fea-dimensions
fail-safe-brake-fea-flanges

Features of FEA Spring Set Electric Brakes / Electric Motor Brakes

Carlyle Johnson's multiple disc spring set electric brakes are proven to provide long service life, and can be rebuilt without requiring any special tools. There are no slip rings, no brushes and no troublesome wiring issues that make repair difficult.

CJM's multiple disc spring set brakes also feature an adjustable end plate design. With few moving parts and a stationary housing, these remote-controlled brakes are effective in helping to protect personnel from accidents and machines from damage.

Advantages

  • Highly repetitive, spring-set brake
  • Unique end-plate design allows easy wear adjustment
  • Stationary field eliminates need for brushes and rings
  • Stationary cylinder assembly
  • Highest torque in the smallest space within the industry
  • Completely assembled, ready to install
  • No levers, cams or highly stressed parts

Operation

  • Torque range 12 lb. ft. - 600 lb. ft.
  • Positive engagement / disengagement possible at any speed
  • Exclusive long-life floating discs pack for low hear, low neutral drag and consistent release
  • Runs in both rotation directions, wet or dry
  • Spring applied, electrically released

Customization

  • Adjustable end-plate design
  • Custom disc pack design, special coils
  • Modified magnetic circuits
  • Variety of electronic controls available to provide slower or faster actuation and release as well as controlled acceleration and deceleration
  • Custom designs and alterations available

Downloads

product-paper-tech-paper-ringfeder-locking-assemblies-en-11-2022

FEA Brake Specification Sheet
tech-paper-ringfeder-locking-assemblies-rfn-7006-en-11-2021

Upload a CAD for a custom electric brake design.

Further downloads including certificates, instruction manuals and product images are available to you in our Download Center:

Downloads