The asynchronous electric motor works by induction by the rotating magnetic field. Let’s look at how it works to better understand the difference between synchronous and asynchronous speeds. A horseshoe magnet is suspended by a wire on a copper or aluminum disk, which in turn is on an iron plate 10hp motors . The function of this board is to close the magnetic circuit, concluding the magnetic flux path from the permanent magnet. The function of the bearing and the pivot is to ensure that the disc can rotate freely.
If the magnet begins to rotate, its magnetic field will also rotate and this movement will divert to the current disk parasites, a phenomenon of generating action, which produces an induced magnetic field that opposes the movement of the magnet (Lenz’s law). We can say that the magnetic field of the parasitic currents will produce a south pole on the disk, near the north pole of the magnet, and a north pole on the disk near the south pole of the magnet. With this, an attraction is formed between the disk and the magnet and as the magnet is in motion, the disk also starts moving, we call it motor action, and it tries to keep up with the rotation of the permanent magnet.