Multi-Function Electromagnetic Tooth Clutches

Electromagnetic tooth clutches manufactured by Monninghoff feature precision-machined teeth that can be varied to achieve different performance and functions. Standard teeth are optimised for high torque transmission but many alternatives are possible, for example torque limiting, single-position synchronising and single direction. Clutches and brakes can be manufactured with customised teeth to achieve application-specific performance.

Electromagnetic tooth clutches transmit torque without slip. Standard designs are engaged by application of a DC voltage, usually 24V. The transmitted torque and the permissible engagement speed depends on the design of the engagement teeth. Monninghoff uses one hardened bronze tooth ring for the clutches. This prevents magnetic flux passing through the teeth and improves the engagement and wear characteristics. Both stationary field and slip-ring designs are available - the most popular and adaptable version has a bearing-mounted stationary field coil and torque ratings from 20 to 2200Nm.

Engagement of the clutch is generally performed at standstill or low speeds. This again depends on the tooth design and stiffness of the system. Standard clutches use 200 to 300 small symmetrical teeth, which are economical to manufacture and provide easy engagement. By adjusting the tooth angle to make them more shallow, clutches can be prepared to release at a pre-defined torque. As the teeth are thrown apart under torque load, such clutches can be used as fast acting and sensitive torque limiters. The tooth pattern can be made asymmetrical so that the relationship between input and output is synchronised.

This allows one engagement position per revolution, and further variants can engage at two, four or more positions. Changing from standard to saw-shaped teeth allows higher engagement speeds but in a single direction - torque transmission in the reverse direction is minimal. Monninghoff tooth clutches and brakes find varied application in areas such as printing, bookbinding, barrier doors and test machinery. Beyond the tooth form, other options include clutch couplings, spring-applied clutches, pneumatic actuation and zero-backlash models. Technical advice is available through Techdrives.


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