System for writing magnetic scales

US6850139B1 · kind B1 · utility

Assignee

• Imo Institut fur Mikrostrukturtechnologie und Optoelektronik E.V. · DE

Inventors

• Fritz Dettmann · Solms, DE
• Uwe Loreit · Wetzlar, DE
• Carsten-Uwe Möller · Oberkollwangen, DE
• Torsten Schönbach · Limburg, DE

Key dates

• Filing date: Mar 3, 2000
• Grant date: Feb 1, 2005
• Expiry date: Mar 3, 2020

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F13/003
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

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.