AC magnets are intended for installation in vibratory conveyor systems used in material feeding and conveyor technology. A complete vibrating magnet consists of the core carrying the winding and the associated armature.
The vibrating magnet and the armature, together with the spring system, form the actual drive of the vibratory conveyor. The weight proportions of the static and vibrating masses, together with the spring force, result in a resonant vibratory system. Vibratory conveyors can therefore only work in a relatively small frequency range around the point of resonance. All components of the complete drive must be tuned to this frequency. It is important that the vibrating magnet is also to be designed for the right electrical frequency, otherwise the electrical power of the magnet will not be used efficiently or the magnet will be overheated by an excessively high current.
Most vibratory conveyors traditionally operate using control units which have the same or twice the vibration frequency as the supply voltage (50 Hz or 100 Hz in Europe and Asia, 60 Hz or 120 Hz in America). In addition to statements of frequency in Hz, industry specific terms such as full-wave (6000 vibrations/minute) or half-wave (3000 vibrations/minute) are often used to describe the vibration frequency.
Low-frequency vibratory systems with vibration frequencies typically between 15 and 25 Hz are also used for special applications (to ensure product flow); these systems must be controlled with special frequency converters (REOVIB MFS).
The important thing is that the mechanical vibration frequency of the conveyor system and the type of drive control (output voltage from the control unit) be taken into consideration in the electrical design of AC magnets.