Position detecting device of linear motor

Details Position detecting device of linear motor Position detecting device of linear motor

2007-09-04

2007-09-04

Tamai, Karl (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Linear

C318S135000

Reexamination Certificate

active

11156015

ABSTRACT:
The invention provides a device for improving the positioning accuracy of a linear motor. A stator20is designed to have two kinds of magnets with different surface magnetism arranged alternately and at uniform intervals along the linear moving direction. A moving member30is disposed movably in the linear direction while maintaining a uniform distance from the stator. A detector head50formed integrally with the moving member30detects the magnetic flux of the stator20and sends the data to a control unit60. The fixed laser length measuring machine100irradiates a laser beam LB to a target110attached to the moving member, and using the reflected light, measures the distance between the laser length measuring machine and the target highly accurately. The position of the stator20used as the magnet scale and the highly accurate position data measured by the laser length measuring machine100are compared so as to compute the correction data corresponding to the position of the stator, and the computed value is stored in the storage unit70to be utilized for the positioning of the motor.

REFERENCES:
patent: 6008552 (1999-12-01), Yagoto et al.
patent: 6501262 (2002-12-01), Schneeberger et al.
patent: 2006/0001390 (2006-01-01), Yamazaki et al.
patent: 2006/0138977 (2006-06-01), Kircanski et al.
patent: 2002-281729 (2002-09-01), None
patent: 2002-281783 (2002-09-01), None
Chinese Office Action for corresponding Application No. 200510074691.0 dated Sep. 29, 2006.

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