Position transducer

US6630659B1 · kind B1 · utility

Assignee

• STRIDSBERG INNOVATION AB · SE

Inventor

• Lennart Stridsberg · Stockholm, SE

Key dates

• Filing date: Jun 28, 1999
• Grant date: Oct 7, 2003
• Expiry date: Jun 28, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/3473
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A compact position and velocity transducer having a high speed resolution and a fast speed response and that does not place much demand on the precision of the bearings. The transducer includes an optical encoder that, when assembled in motors, is assembled on a short protruding part of the rotor close to the torque-creating parts. The optical incremental encoder signals are fed both to a moderate frequency digital counter that counts 4 counts per basic encoder period and to an A/D-converter that samples and digitizes the primary encoder analog signals. A processor uses a linearization algorithm on the sampled and digitized signals that yields position information that is locally highly continuous.