Holding Brake; Types And Modes Of Operation Of The Holding Brakes - Siemens SIMOTICS S-1FK2 Operating Instructions Manual

3.8

Holding brake

3.8.1

Types and modes of operation of the holding brakes

The chapter describes types and modes of operation of the holding brakes.
The type of holding brake installed depends on the size of the motor.
Type of holding brake
Installed in the motors
Method of operation
NOTICE
Damage to the motor due to axial forces on the shaft extension
Axial forces on the shaft extension can damage motors with an integrated holding brake.
• Avoid impermissible forces on the shaft extension. You can find the permitted axial forces
SIMOTICS S-1FK2 synchronous motors for SINAMICS S120
Operating Instructions, 02/2022, A5E46089564B AD
in the section "Permissible radial and axial forces (Page 36)".
Spring-loaded brake
1FK2☐03 ... 1FK2☐04
The spring causes a compressive
force on the brake armature disk.
This means that in the no-current
condition, the brake is closed and
the motor shaft is held.
When 24 V DC rated voltage is ap‐
plied to the brake, the current-carry‐
ing coil produces an opposing field.
This neutralizes the force of the
spring and the brake opens without
any residual torque.
The spring-loaded brake has a tor‐
sional backlash less than 1°.
Mounting and options
3.8 Holding brake
Permanent-magnet brake
1FK2☐05 ... 1FK2☐10
The magnetic field of the perma‐
nent magnets exerts a pulling
force on the brake armature disk.
This means that in the no-current
condition, the brake is closed and
the motor shaft is held.
When 24 V DC rated voltage is
applied to the brake, the current-
carrying coil produces an oppos‐
ing field. This neutralizes the
force of the permanent magnets
and the brake opens without any
residual torque.
The permanent magnet brake
has a torsionally stiff connection
to the motor rotor.
47