Method and apparatus for precision control of linear motors and

Details Method and apparatus for precision control of linear motors and Method and apparatus for precision control of linear motors and

1987-07-23

1989-04-18

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318135, 250237R, 340710, G05B 1100

Patent

active

048230626

ABSTRACT:
A two-dimensional linear motor is provided with sensors respectively capable of detecting only the x and y grid lines arranged in a platen traversed by the linear motor. These signals are accumulated and their counts are compared against the respective x and y distances the linear motor is to be moved in order to move the linear motor to the precise position desired and/or to verify that the desired movement has been accomplished. Differentiation of the mutually orthogonal sets of grid lines is accomplished by providing the grid lines with reflective surfaces which have different reflectivity characteristics or alternatively have a different reflectivity characteristics at with appropriate evaluation devices such as filters or threshold circuits which differentiate between either different wavelengths or different reflectivity characterisitics. The orthogonal grid lines may alternatively be formed upon a transparent sheet which has openings to receive the teeth of the platen whereby the grid lines are positioned within the grooves which are formed in the platen.

REFERENCES:
patent: 3735231 (1973-05-01), Sawyer
patent: 4364035 (1982-12-01), Kirnch
patent: 4390873 (1983-06-01), Kirnch
patent: 4546347 (1985-11-01), Kirnch

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