COIL CORE FOR GENERATING A PARALLEL MAGNETIC FIELD

摘要

It is possible to obtain a magnetic flux distribution having a shape near to a parallel magnetic field by rectifying a magnetic flux distribution so that the magnetic flux distribution has a gap portion not expanding in a barrel shape without increasing the gap area. In a coil core having an air gap formed by opposing poles, there are provided magnetic flux rectifying plates arranged around external circumferences of the respective opposing poles and extending in the gap direction for unifying the magnetic flux density distribution in the gap. Each of the magnetic flux rectifying plates has a wedge-shaped protrusion of such a form that the plate thickness becomes thinner toward the gap outward direction from the opposing plane edge portions of the poles.