Cylinder-type linear motor and moving part thereof

Details Cylinder-type linear motor and moving part thereof Cylinder-type linear motor and moving part thereof

2008-05-27

2008-05-27

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Linear

C318S135000, C318S015000

Reexamination Certificate

active

11197014

ABSTRACT:
The present invention provides a cylinder-type linear motor. The motor includes a fixed part including a coil assembly having a plurality of ring-shaped coils arranged in the axial direction to form a cylindrical space, and a yoke member made of a magnetic material, which is provided on the outer periphery side of the coil assembly and a moving part including a linear motion shaft provided on the axis line of the fixed part so as to be capable of reciprocating in the axial direction, and a permanent magnet assembly having one or more permanent magnets magnetized in the axial direction, which is provided on the linear motion shaft. The motor is characterized by when the axial length of the ring-shaped coil is taken as C, the axial length of the permanent magnet assembly as M, and the outside diameter thereof as D, a stroke S is equal to or smaller than (n×C−M), the axial length Y of the yoke member is set equal to or larger than (M+S+0.8×D), and the ring-shaped coils are arranged in a predetermined phase order and the ring-shaped coils of the same phase are connected to each other to form one phase winding.

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