Maximum Energy Product
Maximum energy product is an index expressing the performance of a permanent magnet. The units are the joule per meter cubed [J/m3] in the SI system and the gauss oersted [GOe] in the CGS system. The maximum energy product is expressed as (BH)max. The product of H (taken as positive) and B at the point (H, B) on the B-H demagnetization curve is called the energy product and the maximum value of this product is the maximum energy product. This value serves as a yardstick for the maximum amount of magnetic flux taken out from the magnet per unit volume. When a magnetic circuit is designed to operate at the maximum energy product point, the magnet volume is reduced to its smallest value.