MULTIHEAD TYPE CORELESS LINEAR MOTOR

PROBLEM TO BE SOLVED: To provide a multihead type coreless linear motor which can be reduced in size to the minimum possible even when there is a significant difference in required thrust among a plurality of workpieces mounted on linear motor moving parts. SOLUTION: A multihead type coreless linear motor includes: a permanent field magnet having P permanent magnets 6 that are arranged such that different magnetic poles appear alternately, and an armature having M armature coils 3 that are closely wound and connected in three phases. One of the armature and the permanent field magnet is configured as a moving part 1, and the other is configured as a stator 4. A plurality of moving parts 1 are arranged on the same stator 4 and are driven separately. In this multihead type coreless linear motor, the plurality of moving parts 1 include a large-thrust moving part 11a and a small-thrust moving part 12a that are different in relationship with the stator 4, the relationship being determined by P, the number of magnetic poles of the permanent magnets 6 and M, the number of armature coils 3. COPYRIGHT: (C)2011,JPO&INPIT