This applies a strong demagnetizing field upon the magnet, which will tend to be demagnetized.
cj] magnets, the number of winds in the coil can be reduced or the electric current levels can be lowered to weaken the demagnetizing field.
Generally, the demagnetizing field for magnets is reduced by positioning the magnet deep inside the rotor, which helps to ensure a magnetic flux path on the q-axis and increases reluctance torque.
Therefore, small holes were positioned to prevent stress from accumulating near the beam section in order to change magneto-resistance by reducing the path for magnetic short-circuits and changing the direction of the demagnetizing field.
As these magnets operate in high-temperature environments with strong demagnetizing fields, however, they require high heat resistance, or coercive force ([H.
Therefore, to reduce the amount of heavy rare earth used, engineers need to reduce the demagnetizing fields acting upon magnets and increase magnet permeance to allow use of low-[H.