Electromagnetic coupling

Purpose, device, principle of electromagnetic coupling operation Electromagnetic couplings are used for closing and opening kinematic circuits without stopping rotation, for example in gearboxes and gears, as well as for starting, reversing and braking machine drives. The electromagnetic clutch is an individual speed controller and is an electric machine that serves to transmit torque from the driving shaft to the driven shaft using an electromagnetic field, and consists of two main rotating parts: an armature (in most cases, it is a massive body) and an inductor with an excitation winding. Armature and inductor are not mechanically rigidly connected to each other. As a rule, the armature is connected to the drive motor, and the inductor - to the working machine. When the drive motor rotates the clutch drive shaft in case there is no current in the excitation winding, the inductor and with it the driven shaft remain stationary. When direct current is supplied to the excitation winding in the magnetic circuit of the coupling (inductor - air gap-armature), magnetic flux occurs. When the armature rotates relative to the inductor, the EMF is induced in the first and a current occurs, the interaction of which with the magnetic field of the air gap causes the appearance of an electromagnetic torque.