Pre-multi-frequency eddy current sorter is an advanced eddy current sorter. The material composition, hardness, heat treatment state and mixture of bearing rings, rollers and steel balls can be identified and sorted.
The magnetic induction of the tested material is carried out by the excitation coil. The induced electromotive force received by the detection coil is related to the shape and size of the material hysteresis loop. When the low-frequency sinusoidal excitation voltage is magnetically induced, the induced electromotive force obtained is also sinusoidal waveform, usually including the fundamental wave. By measuring the fundamental wave composition of the induced electromotive force of the detection coil. It can detect the alloy composition and heat treatment status, so as to realize the material hardness sorting.