1, Generation of electromagnetic force: The electromagnetic exciter of the electromagnetic vibrating feeder is composed of an electromagnet (iron core and coil), an armature, and a main vibration spring. When a unidirectional pulsating current after half-wave rectification is passed through the coil, during the positive half cycle of the alternating current, the pulsating current flows through the coil, and the electromagnet generates a pulsating electromagnetic suction force, causing the armature and the iron core to attract each other. During the negative half cycle, there is no current passing through the coil and the electromagnetic force disappears.

2, Trough vibration: The armature is connected with the main vibration spring of the trough. Under the action of electromagnetic suction in the positive half cycle, the trough moves backward, and the main spring of the exciter deforms and stores potential energy. When the electromagnetic force disappears, the armature is separated from the electromagnet under the action of spring force, and the trough moves forward. In this way, the material trough continuously performs reciprocating vibration at the frequency of the alternating current power supply.