Magnetic Coupling
Magnetic Coupling
(OP)
Does anybody has experience in specifing, instaling Magnetic Coupling? The usual problems and misunderstandings. For example: I'll use it for conveyor belt drives. 200 CV X 1180 rpm. It must limit the torque to 140% of the maximum. Is it possible? Can't it miss its magnetig properties in case of slipage, and consequent overheating? Are temperature sensors recomendable?
RE: Magnetic Coupling
I've found magnetic couplings require a lot of communication for a given design to be successful. I've experienced all sorts of problems & miscommunications so I'm not sure what the "usual problems and misunderstandings" are.
A short answer to your question about limiting torque to 140% of maximum: Yes, it certainly is possible. A properly designed coupling can work to almost any torque that a customer is looking for. If the coupling uses SmCo as a permanent magnet material than there is minimal chance that it will lose its magnetic properties and overheating will not be a concern.
The biggest challenge that I've experienced is convincing customers to pay for a proper design. Most want a standard, off-the-shelf coupling that wasn't designed for over-torquing or temperature extremes. If you are willing to invest in a custom design, the chances are that it will work well for you.
RE: Magnetic Coupling
Do you, with your experience in Magnetic coupling, think its applicable to conveyor belts, with usually has very different torques, as it can be fully loaded, or with only a small % of its nominal capacity? Is there any "in field setting for torque limit"....just like a hydraulic coupling has? As easy as filling it with oil?
RE: Magnetic Coupling
The higher torque coupling that use inner and outer magnet assemblies are not really adjustable.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Magnetic Coupling
I consider a regular torque coupling one which will transmit a specific amount of torque up to a certain speed. A hysteresis coupling will transmit a constant amount of torque irregardless of speed. Each have a different construction and it is important to understand the application to specify the correct one.
As EdStainless mentioned, in a face-to-face torque coupling, the torque can easily be controlled by adjusting the air gap.
Coaxial torque couplings (inner & outer magnet assemblies) can also be adjusted but not as easily. The adjustment involves controlling the amount of axial engagement between inner & outer assemblies. It's been done, but not very often in my experience. I wouldn't consider it "as easy as filling with oil."
RE: Magnetic Coupling
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm