The electromagnetic vibrating feeder is a relatively complete elastic system with two-point directional forced vibration. The whole system works in a low-critical resonance state. The electromagnetic exciter is mainly used to drive the trough body to reciprocate at a certain inclination angle to move the material along the trough.

Figure 2 (a) shows the working principle of the electromagnetic vibrating feeder. The material 2 is placed on the supply tank body 1 supported by the main vibration spring 3, and the armature 4 is integrally connected with the main vibration spring of the tank body, and the coil 6 is wound around the iron core 5. Since the unidirectional pulsating current after half-wave rectification flows through the coil, the electromagnet generates a corresponding pulse electromagnetic force (Fig. 2(b)). During the positive half cycle of the alternating current, the pulsating current flows through the coil, generating a pulsating electromagnetic attraction between the iron core and the armature, causing the groove body to move backward, and the main spring of the vibration exciter is deformed to store the potential energy; in the negative half cycle, No current flows through the coil, the electromagnetic force disappears, and the armature separates from the electromagnet under the action of the spring force, so that the trough moves forward, so that the trough continuously vibrates at the frequency of the AC power source.