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The difference between electromagnets and permanent magnets

Permanent magnets used at the job site typically use a control handle to make and break connections. They can be used to carry flat materials, but also can handle circular parts within 2,200 pounds. These lifting devices are 'self-contained' and the cutting magnets can be moved to different work sites at any time in the machine shop, but one of the disadvantages of permanent magnets is the limited lifting capacity.
Electromagnets use electrical excitation and suck material onto the surface of the magnet. The electromagnet uses an energizing coil wound around the core to align the particles in the ferromagnetic material in a common direction. The magnet then generates a magnetic field. Electromagnets generally operate with direct current and therefore require rectifiers. Unlike permanent magnets, electromagnets require a constant power source, which may be viewed as an advantage because the use of electromagnets is not seen as a disadvantage. When using electromagnets, power failure can be catastrophic, although multi-purpose power supplies and battery backup systems available on the market today can be used to solve these problems. On the other hand, the ability of the electromagnet to change the energizing current provides the user with greater flexibility than the permanent magnet.

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