Patent ID: 7989993

Claim:
A magnet yoke of a linear motor, comprising: a plurality of recesses set in equidistance on a side surface of the magnet yoke and defining a plurality of peaks and valleys arranged alternately on the side surface of the magnet yoke, wherein a thickness of the peaks is greater than a depth of the valleys; a plurality of permanent magnets set in equidistance on an opposite side surface of the magnet yoke, wherein two adjacent said permanent magnets are spaced by an interval therebetween and a center of the interval is aligned with a corresponding said peak or valley; and a magnet unit consisting of two adjacent said permanent magnets for generating a magnetic flux distribution, whereby an empty section of the magnetic flux distribution is formed in one said valley, wherein an interval between two adjacent empty sections is twice as wide as the interval between of two adjacent said permanent magnets and is located right in a middle of two adjacent said permanent magnets so as to make the magnetic flux distribution moderate and wherein a center of an interval between two adjacent said magnet units is aligned to a center of a corresponding said valley.