Basics
High-tech torque transmission
GERWAH Magnetic Clutches do not transmit torques through mechanical connections like their mechanical counterparts but by using magnetic forces. It has to be distinguished between synchronous- and hysteresis clutches according to the function principle in use.
The hysteresis clutch
With this type of clutch, one half of the clutch is coated with a hysteresis lining instead of permanent magnets. This hysteresis material works similar to the permanent magnets, but through the hysteresis lining, poles can be changed with low effort. If the nominal torque of the clutch is exceeded, the clutch starts slipping. Thereby the hysteresis material takes up energy from the drive system, due to the permanent changing of poles caused by the passing of the permanent magnets and transforms this into lost heat which is released into the environment.
The synchronous clutch
Synchronous clutches transmit torques by magnetic forces, which are produced through periodically arranged, opposite permanent magnets. According to the size of the clutch, torques up to 1000 Nm can be transmitted. When exceeding the rated torque level the magnetic forces break off, the clutch slips and transmits only a minor rest torque. The synchronous clutch owes its name to its characteristic to only transmit torque if a synchronous run of the system to connect is granted.
Magnetic Clutches – Advantages at a glance
Precise Torque Limiting Up to 1000 Nm (synchronous clutch)
- Easy and fast adjustable torque infinitely adaptable to your requirements
- Even for extreme high rotation speeds
- Independent of age and operation
Superior hygiene requirements
- No abrasion
- No equipment or external supply units necessary
- Also available in stainless steel
Unlimited number of overload cycles
- Absolutely wear-free
- Nominal torque always remains constant
- Maintenance-free
Superior transmission with application of hysteresis clutches
- Constant and “soft“ slipping at torque limiting
- “Soft starts” – smooth starting moments
- The shafts to be connected can be operated with different torques
- Contact-free power transmission
Applications
Selected fields of application suitable for GERWAH Magnetic Clutches
As safety coupling
GERWAH Magnetic Clutches offer excellent protection against overload. Wear-free and precise they protect even sensitive applications and systems.
In bottle capping systems
Due to technical superiority and elegant functionality compared to all other solutions, hysteresis clutches established themselves world-wide in this field of application. Precise torque limiting, wearfree operation, constant and jerkfree behaviour within the overload range as well as the stainless steel and equipment free version are significant advantages. Especially our two series HSV and HLV have proven themselves as excellent for the use in bottling machines.
In wind-up and unwind applications
Within this field of application exact and constant torque limiting is crucial, which is fulfilled optimally by GERWAH Hysteresis Clutches.
As brakes
Especially for the application as a brake the GERWAH Magnetic Clutches show themselves as manifold suitable: As a load for engines for example, or even as generators for test blocks and furthermore in many other application fields. Through their abrasion-free operation, GERWAH Hysteresis Clutches offer fundamental advantages over friction based clutch systems.
Within the progress technology
Due to their ability to transmit torque even by going through magnetic non-conducting materials, GERWAH Magnetic Clutches offer unique possibilities for sealing, e.g. in pumps.
Applications
- Bottle capping machines
- Wind-up and unwind systems
- Brakes
- Test procedures
- Packaging technology
- As safety clutch in e.g. extrusion plants, shredders, or similar
- Pump drives
- For “soft starts”
- As safety clutch with “smooth” overload transition behavior
- Food industry
- Cosmetic production
- Medical engineering
Series HLV
- Narrow design
- Easy adjustable torque
- Completely stainless steel version
- Flexible attachment possibilities
Range of applications
- Bottle capping machines
- Packaging technology