Product Description:

The 09.09.870-744U is a dry-running electromagnetic clutch element supplied by KEB within the BR Braking Resistors series. Even though the platform is primarily associated with dynamic braking components, this item serves as a torque-transmitting interface that couples a driving shaft to a driven load on command. In industrial automation, it allows conveyors, indexing tables, or tensioning stations to start or stop motion without altering motor speed, simplifying mechanical sequencing and reducing cycle times in packaging, printing, or material-handling equipment.

The clutch is energized to engage when its coil is excited. During engagement, it can deliver a rated torque of 65 Nm, enabling direct connection to medium-duty drive trains without intermediate gear reduction. Continuous rotation up to 3000 rpm is permissible, so centrifugal forces remain within the operating limits of its steel rotor, which has an inertia of 23.29 × 10⁻⁴ kg·m². The magnetic circuit draws only 35 W at 20 °C, limiting electrical demand and easing thermal management. Accurate pole-face alignment is established by an air gap of 0.35 mm, which supports predictable pull-in time and repeatable torque transfer.

The unit functions only as a clutch, so it generates no braking torque after release; thermal loading must therefore remain within a permissible friction rate of 228 J/s. Short bursts can reach a maximum friction work of 7.5 × 10³ J, while operation at a reduced wear depth of 0.1 mm permits total energy absorption of 40.9 × 10⁶ J. The armature has an inertia of 12.61 × 10⁻⁴ kg·m², which influences acceleration stress on the friction layer and affects service intervals. When wear increases the working gap to 0.7 mm, the setting ring must be readjusted to restore the required response time.