Stabilisation The process where a magnet is exposed to demagnetising influences expected to be encountered in operation. The exposure to these demagnetising influences such as high or low temperatures or external magnetic fields prevents irreversible losses during operation.
Magnetising Force, H The magnetomotive force per unit length at any point in a magnetic circuit. This is measured in Oersteds. Magnetomotive Force, F This is the potential magnetic difference between any two points. Maximum Energy Product, BH Max There is a point at the hysteresis loop at which the product of the magnetising force H and induction B reaches a maximum. This maximum value is called the Maximum Energy Product and is measured in Mega Gauss Oersted, MGOe. Oersted, Oe A unit of magnetising force (cgs). This is equivalent to Ampere Turns per Inch (S.I) Permeance Coefficient, Pc Ratio of the magnetic induction to self demagnetising force. This is also known as the 'load line' or operating point of the magnet.
Pull Gap Usually illustrated in graph form, these curves are a
representation of the relationship between the attractive force exerted by a magnet on a soft magnetic work-piece and the distance between them.
Pull Gap curve diagrams are useful when selecting a magnet for a particular tractive or holding application.
Remenance Remenance is the magnetic induction which remains in a magnetic circuit after the removal of an applied magnetising force. If there is an air gap in the circuit, the remenance will be less than the residual induction Br. Residual Induction, Br This represents the maximum flux output from a given magnet material measured at the point where the hysteresis loop crosses the B axis at zero magnetising force. Return Path A magnetic circuit which provides a low reluctance path for the magnetic flux. Reversible Temperature Coefficient A measure of the reversible changes in flux caused by temperature variations. Saturation This is the condition whereby a magnet or ferromagnetic material has reached a maximum value and an increase in the appliance of magnetising force produces no increase in induction i.e. saturation flux densities for steels range from 16,000 to 20,000 Gauss.
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