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HOW TO INCORPORATE CLUTCHES & BRAKES IN A MACHINE DESIGN

ELECTROMAGNETIC CLUTCHES & BRAKES EXPLAINED

Electromagnetic clutches & brakes are old technology that has changed little in the past 20 years.  Decentralised drives have reduced their use but many applications remain where the ability to connect, disconnect, stop and hold is irreplaceable. This new article examines friction clutches and brakes that use electromagnetic force to engage, usually provided by a 24V DC supply. Different types of design are examined with a description of how they work. The article describes the common pitfalls in mounting and makes recommendations to the Design Engineer on the most efficient way to incorporate them into a machine.

Electromagnetic clutches and brakes have largely become standardised in Europe with near-interchangeable dimensions. Torques are typically in the range 3 to 500Nm although there are niche exceptions, even up to 2000Nm or more. Typical shaft sizes are 5 to 80mm. For the vast majority of applications they can be considered as maintenance-free units although engagement at high speeds will result in infrequent adjustment for wear. The norm is to use a low voltage DC supply, usually 24V DC but other voltages up to 48V are possible.

Techdrives offers in the UK the INTORQ range of electromagnetic clutches and brakes, previously known up to 2003 under the Simplatroll and Lenze brands. The new article is available for free download on the Techdrives website www.techdrives.co.uk/clutch-guide.html

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Electromagnetic friction brake