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when both runs at same speed
A plain mag coupler uses magnets to replace the field and armature coils in a brushless dc motor. Then two shafts are coupled together, but to remain coupled they have to be synchronous (rotating at the same speed). If one shaft has a drive motor and the other has the load (fan blades for example) if the load exceeds the maximum torque they slip and are no longer coupled together (the blades will stop turning until the motor stops and restarts). A mechanical inductive coupling has a squirrel cage similar to an induction motor. This allows the transmission of torque without having to have the same speed. Also, inductive coupling can refer to transmitting electrical power through coupled inductors or a transformer.
It makes the motor run insufficiently.
motor will not rotate
motor stops