How the Ogura SNB Spring-Set Brake Works

Engagement: When no current/voltage is applied to the brake, a series of springs push against the pressure plate, squeezing the friction disk between the inner pressure plate and the outer cover plate. This frictional clamping force is transferred to the hub, which is mounted to a shaft (customer supplied). The power-off brake is considered engaged when no power is applied to it. It is typically required to hold or stop a load in the event of a loss of power, when power is not available to run a machine.

Disengagement: When the brake is required to release, voltage/current is applied to the coil, creating a magnetic field. This magnetic field pulls in the pressure plate, pulling against the springs, creating an air gap between the pressure plate and the friction disk, and allowing it to turn freely with the shaft.