| 摘要 |
When a pitch between centers of two adjacent magnetic pole portions disposed on an armature is defined as taus, the length W of permanent magnets disposed in the middle is equal to the pitch taus (W=taus). The length of each of the two end permanent magnets respectively disposed at either end of a permanent magnet magnetic pole row is denoted by W1. A ratio w1/W of the length W1 to the length W is defined as 0.43<W1/W<0.49. With this definition, cogging torque of a linear motor may sufficiently be reduced.
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