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As the name applies, Electro-Permanent Lifting Magnet is hybrid of electro lifting magnet
and permanent lifting magnet. But in nature, it is permanent magnet as a holding device,
because the magnetic force is generated by its permanent magnets only. Electro-Permanent
Lifting Magnet only uses electricity to turn on and turn off its magnet power.
Electro-Permanent Lifting Magnet is composed of magnet materials, steel parts, coils and electronic control device.
There are two magnetic power sources in Electro-Permanent Lifting Magnet. One is a set of high intrinsic coercive force (Hci) magnets and another is a set of low Hci magnets. The low Hci magnets are wrapped in electrical wire coils. Changing the direction of current pulse in the coils can change the direction of its magnetic orientation.
When the two sets of the magnets have same magnetic direction the Electro-Permanent Lifting Magnet has attractive force to ferromagnetic work piece. If the two sets of the magnets have opposite magnetic directions they absorb each other’s energy, so that the Electro-Permanent Lifting Magnet has no lifting capacity.
A computerized control device switches current pulses to the coils which are wound around the low Hci magnets in reverse directions to magnetize them in contrary orientation. This turns on and off the magnetic power of the Electro-Permanent Lifting Magnet.
Advantages of Electro-Permanent Lifting Magnet: