Now available from Techdrives is the INTORQ BFK457 range of spring applied brakes available in seven sizes, ranging from 37mm diameter and a rating of 0.12Nm up to the standard size 16 with a diameter of 190mm and a torque of 125Nm. There are two different designs available. The Basic design requires customers to provide a surface for mounting and friction that should be smooth and ferrous. This is the lowest cost option. The Compact design comes fully assembled with its own mounting surface. The air gap is preset and Compact brakes are particularly fast and easy to mount.
These spring applied brakes generate torque by multiple springs that push together an armature plate, a rotating brake disc and a fixed mounting surface. The brake disc carries friction material that results in smooth and regular torque ratings. The brake is released when current is applied to a dc coil. The resulting magnetic flux pulls back to the armature plate and frees the brake disc. Coil rated voltages are either 24 or 205Vdc, the latter for rectified mains voltages.
The BFK457 range is simple but still has a number of options. A manual brake release lever can be specified to allow the brake to be released without electrical power. For use in noise sensitive areas such as hospitals and theatres, a low-noise brake disc can be supplied guaranteeing noise levels below 50dbA. In applications that are particularly safety sensitive, a double brake with piggy-back mounting is available.