Types of eddy current couplings

[nothing909]

Homework Statement

I have a really simple question, state two types of eddy current couplings and state a flexible coupling, but I've been googling it for the last half an hour and can't find an answer.

The Attempt at a Solution

Can anyone tell me two types of eddy current couplings? I know the flexible couplings.

 

[Nidum]

Search using these key words :

Eddy current clutches .

Eddy current torque transmission .

Eddy current brakes .

 

[nothing909]

I literally can't find anything. You type in "flexible couplings" and it gives you many but it doesn't say anything about types of eddy current couplings...