The electrically controlled centrifugal brake provides braking speeds below the normal operating speed of an electric motor drive system.
DESIGN & FUNCTION
The electrically controlled centrifugal brake is connected to the motor shaft (2). Under normal operating conditions, power is supplied to the spring loaded electrical brake (7). The electric brake disc (6) is connected to the centrifugal brake drum (5). Both are free to rotate together with the flyweights (3) and the hub (1) without providing a braking torque, whilst current is applied.
Without electrical current, the brake disc (6) and the centrifugal brake drum (5) is locked, by spring pressure.
When the engagement speed of the centrifugal brake is reached, the springs (4) allow the flyweights (3) to engage with the drum. This causes a soft braking action at speeds below the normal operating speed.
By changing the springs (4), the centrifugal brake engagement speed can be adjusted.
As soon as electrical power is reapplied to the motor and the electric brake, the drive system returns to normal operating conditions.
Reducing the descent speed of the elevator system or hoist during a power cut to 50%-60% of the normal operating speed.
Switching off the centrifugal brake to test the ultimate stop brake in the elevator system.
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