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Save money and space with permanent magnetic clutch

09 September 2016

SG Transmission has designed and manufactured a permanent magnetic clutch for a global, medical device manufacturer, replacing the need for both a brake and a clutch, saving money and weight.

Permanent magnetic brake

The fail-safe clutch utilises rare earth permanent magnets to generate the magnetic field, which keeps the clutch engaged should the power fail.

The clutch was designed for a blue chip manufacturer to replace an existing clutch in a drive mechanism, which needed power to engage the clutch.

The existing configuration could, in the event of power failure, allow the mechanism to potentially become free moving in an uncontrolled manner. Standard practise would be to use a fail-safe brake in this arrangement to control the free movement, which would create an additional cost.

The permanent magnetic clutch has the potential to replace both components and not only save space, weight and part count, but also save on cost. 

Paul Short, technical manager at SG Transmission, said if the drive system uses a gearbox where the output shaft cannot be ‘back driven’ then, in some applications,  by employing a permanent magnetic clutch this mechanical advantage can be used to provide a positive stop/hold action in the event of a power failure. Therefore, the permanent magnetic clutch is suitable for many sectors including medical and military, where a permanently engaged clutch would be advantageous.

Permanent magnetic clutch

SG Transmission is one of the only electromagnetic clutch and brake manufacturers in the UK to offer the permanent magnetic clutch to a global portfolio. Earlier this year, it launched the ultra-slim permanent magnetic brake with a brake field depth of less than 13mm.

The ultra-slim brake has been developed by using extremely high energy permanent magnets to obtain its high torque in a small space. The brake has a small outside diameter and a brake field of less than 13mm, with a comparatively large bore through the centre for the application’s drive shaft.

Andy Collinson, CEO said SG Transmission have the manufacturing facility to create bespoke solutions where envelope size is highly tolerant or weight restrictions are present. 

SG Transmission is a British Engines Group company, operating from a manufacturing facility in the north east of England. 


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