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Spring-Engaged Brakes

Nexen Group (Vadnais Heights, MN) has introduced the FMBS flange-mounted, spring-engaged safety brakes with high thermal capacity for NEMA C-Face motors and gear reducers. With continuous thermal dissipation, the brakes are able to stop more kinetic energy without overheating. The brakes are available in two models that provide torque from 1080 in-lbs to 1800 in-lbs, and burnished torque from 1300 in-lbs up to 2160 in-lbs, with release pressures of 55 psi and 90 psi and a maximum pressure of 120 psi. Both models feature a top speed of 1800 rpms and zero backlash input.

The brakes mount to NEMA CFace motors and feature a series of springs that push a pressure plate against the friction surface of the brake’s disc-hub, resulting in a thrust force on the disc-hub that produces enough torque to stop and hold the load. These brakes remain engaged until air pressure is applied to compress the springs and opens a gap at the interface. They include programming logic on deceleration to ensure that over-lap dynamic stopping occurs. The brakes also have two bearings supporting the output shaft, providing overhung load capacity for right-angle drive applications.

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