System for writing magnetic scales

Details System for writing magnetic scales System for writing magnetic scales

2005-02-01

2005-02-01

Barrera, Ramon M. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

For magnetizing or demagnetizing

C361S143000, C361S152000, C361S155000, C361S156000

Reexamination Certificate

active

06850139

ABSTRACT:
The invention relates to a system for pulse magnetizing high-precision magnetic scales. The system comprises a shaped current conductor (1) and a pulse current source (2) that is composed of a capacitor bank (3), a transfer switch (4) and a control unit (5). The compact set-up of the system is the prerequisite for a power circuit that has such a low resistance that the required high pulse currents are obtained at supply voltages of below 60 V. The transfer switch is an H bridge with four switches (7) that contain equal numbers of MOS transistors connected in parallel. The short pulse times that are achieved using the MOS transistors allow the use of shaped current conductors with which magnetized areas can be produced with a very high precision. The inventive system provides a means for saving components, electric power and time by a factor of up to 100.

REFERENCES:
patent: 4734816 (1988-03-01), Guillemin et al.
patent: 5684444 (1997-11-01), Becker et al.
patent: 907804 (1954-03-01), None

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