FK - FKL Type

by Coel Motori S.r.l.

Asynchronous Self-braking Three-phase Motor

FK motors are closed and externally ventilated. The brake is supplied DC with rectifier. FK motors can be driven by inverter but in such case it is necessary to supply the brake separately from the motor. The cases are in die pressed aluminum and braking surfaces are in cast iron. Shafts are fitted with an hexagon on the back side for the manual rotation of the shaft. A hand release option for the brake is available on request. FK motors are compact and light and are available with a wide range of options.

Standard Features

  • Disk brake without axial sliding off the shaft
  • Electromagnets encapsulated in resin with IP66 protection
  • Adjustment of braking torque within very large values
  • DC electromagnet a standard

Configuration Options

  • H class insulation
  • IP55
  • Special "P" rotor for high starting torque
  • Special paint
  • Thermal PTC or PTO protection
  • Anti condensation heaters
  • R or S type balancing of the rotor
  • Encoder fitting
  • Lateral brake hand release
  • FKL Series with progressive start and braking
  • FKP series position brake*
  • FKDF series with double brake application*
  • Foot mount B3
  • Foot and flange mounting execution
  • B5 or B14 flange execution
  • B5 reduced flange from frame 71 to 112
  • B14 reduced flange from frame 71 to 100
  • Reduced shaft
  • double end shaft
  • Special shaft
  • Motors B3 with lateral terminal box (up side as standard)
  • Customized executions
  • Special windings
  • Version with forced ventilation

Brake Information

FK brakes are DC supplied through a rectifier.  Windings are encapsulated with resins in F class and braking torque is adjustable for all types.  Brake discs are made in high resistance polymer; such solutions avoid deformation and incoming losses between the shaft and the disc even after long operation period.  It guarantees an efficient anti sticking system and reliable protection against humidity avoiding oxidation.  Friction materials are made with medium hardness mixtures due to guaranteed low consumption and constant braking coefficient.  The construction is modular and maintenance operations are simple.  FK brakes are available in standard or special voltages.


Correct installation of the motor and mechanical components coupled with it is crucial for the operation and life of the motor. The motor must be handled with care, avoiding any hard blows, particularly against the shaft.

Before coupling the motor with any other mechanical component be sure that all parts in good condition, properly cleaned and treated with the proper cleaner.  The motor must be installed in a position that permits proper ventilation, air flow should not be hindered.  Check that all components are perfectly aligned and grounding wire is connected.  Apply the correct feed cable to the motor based on motor name plate rating and local applicable standards.

COEL brake motors are designed with reduced maintenance requirements; however motors do require periodic maintenance such as cleaning including the shell, particularly in cases where the motor works in dusty and dirty environments.  Additionally it is recommended that the magnetic gap between the mobile anchor and the electromagnet be adjusted periodically (every 6 months or 500,000 brake cycles); Air gap must be maintained below 0.5mm (19"/thou) at all times.  

All installations should be inspected and maintained by authorized technician once electrical power is disconnected.  Failing to undertake the necessary safety, inspection and maintenance measures could result in bodily injury and product failure. Authorized technician must inform maintenance and plant supervisors of anomalies such as excessive vibrations, high level noises, high absorption levels and high temperature level.

Motors are supplied with user guide including maintenance instruction manual.  For further information please contact our office 1.888-558-9956