The rotor of the permanent magnet electric motors can take on various configurations, and can house the magnets on both the rotor surface and inside the rotor. When placed inside the rotor these magnets create a difference in the flux permeability between the direct axis “d” and the quadrature axis “q”, that is, the permeability along the direct axis is much lower than that of the axis in quadrature. In this type of configuration, two phenomena of interest occur as the appearance of a reluctance torque due to the permeability difference between the direct axis and quadrature.
This binary is added to the resulting binary by incrementing it. It is verified the existence of a magnetic flux with opposite direction to the magnetic flux produced by the permanent magnet, being able to happen to the demagnetization of the magnet. When we deal with rotors with magnets placed on their surface, the anisotropy is very low and can be considered null because the permeability difference between the direct axis and the quadrature axis is almost non-existent. In some cases we use a rotor in cage with internal magnets and this rotor configuration confers a hybrid character to the motor, being able to execute a synchronous start, directly from the network. mrosupply best prices on baldor