25-10-2012, 02:13 PM
Electromagnetic braking systems
brake.pdf (Size: 407.49 KB / Downloads: 50)
Exact and reliable holding in wind power plants
Our brakes have been in use for many
years in wind power installations and
have been doing their job reliably. The
special requirements of this field of
application are high reliability, long
maintenance cycles, resistance to
environmental influences and a tight
braking-torque tolerance.
For pitch drives, we have developed
stored-spring brakes as holding brakes
that have to display a specific mode of
emergency manner even after a failure.
The brake casing is encapsulated or
suitable for tachometer mounting.
The rotor with plastic sleeve in more detail
The rotor with plastic sleeve offers
numerous advantages when used in
pitch and azimuth drives. The evolvent
tooth profile, which has proven itself
over several years, provides a stable
rotor/hub connection. The plastic
sleeve reduces the backlash and
thereby increases the service life of
the brake.
Pulse width modulation (PWM) in more detail
When stored-spring brakes are
operated from the DC link of a
frequency inverter with pulse width
modulation, partial discharge can occur
and damage the coil system.
We have modified the insulation system
specially for this area of use and
stored-spring brakes without partial
discharge can be supplied as an option.
The advantages of overexcitation and
reduction of the holding current can be
combined with each other in this case.