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Over the braking time, the temperature curve rises very steeply at the start and then gradually approaches a maximum. The temperature at the friction surface (Tb1) is substantially higher than the temperature (T1) at the outer surface of the brake drum. Nevertheless, the brake drum can become very hot during operation and is a source of danger. The authority responsible for opera- tion of the machine is solely responsible for ensuring that suitable protective measures are taken. 160° Types of centrifugal brake 140° T
b1 F-Type 120° see page 8 et. seq. 100° S-Type T
1 see page 10 et. seq. 80° W-Type see page 12 et. seq. 60° P-Type 40° see page 14 et. seq. 20°
Temperature [°C ] 10 20 30 40 50 60 70 80 90 100 120

Time [sec]

The maximum temperature must not exceed the manufacturer‘s maximum permitted temperature for the friction material, otherwise the linings may be damaged. This can lead to a loss of effec- tiveness of the brake and, in the worst case, destruction of the brake. To prevent this, detailed data about the application are required when laying out a centrifugal brake, among others: • Operating speed of the system to be braked • Engagement speed of the centrifugal brake • Braking torque required at the braking speed • Changes in the braking torque • Braking times and frequency • Field of application Centrifugal brakes are speed limiting devices and are fi nding increased use in lowering equipment. In such cases, the speed of lowering corresponds to the equilibrium condition between the speed governed by load torque and the speed governed by braking torque.

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