Moving magnet type linear actuator

Details Moving magnet type linear actuator Moving magnet type linear actuator

2007-07-03

2007-07-03

Schuberg, Darren E. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Linear

Reexamination Certificate

active

10575256

ABSTRACT:
A moving magnet type linear actuator is provided, which can solve a problem of linear guide life even in case that magnetic attraction force between a magnet and an armature is reduced to perform a high-frequent acceleration and deceleration operation.A stator of the linear actuator includes an armature1which is fixed onto a stator base2and has plural coils11,and linear guide rails6arranged linearly so as to sandwich both sides of the armature1;and a mover of the same includes a linear guide block8provided so as to slide on the linear guide rail6,and a field magnet provided with plural field permanent magnets3which are arranged opposed to the armature part through an air gap, held in a hole portion14A provided in anonmagnetic magnet holder14,and arranged so that magnetic poles of the N-pole and the S-pole are different alternately, and with a magnetic back yoke10arranged in the back of the field permanent magnet3through an air gap, provided in a recess part14B provided in a magnet holder14,and formed by laminating thin plate-shaped electromagnetic steel plates.

REFERENCES:
patent: 4883994 (1989-11-01), Nikura
patent: 6541880 (2003-04-01), Okada et al.
patent: 5-346120 (1993-12-01), None
patent: 6-254734 (1994-09-01), None
patent: 7-75325 (1995-03-01), None
patent: 9-266659 (1997-10-01), None
patent: 2000-116105 (2000-04-01), None

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