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Linear Synchronous Motors, 2nd Edition by Bronislaw Tomczuk, Zbigniew J. Piech, Jacek F. Gieras

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7

Sensors

7.1 Linear Optical Sensors

The encoder functioning as a feedback device is one of the basic components of motion control systems. There are four different sensor technologies used in linear servo applications, i.e., resistive, inductive, magnetic, and optical. The least complicated structure has a linear position transducer. Its principles of operation are based on the conversion of linear motion into rotation that is measured with the use of a precision potentiometer, tachometer, or digital encoder. However, the earliest linear encoders utilized in high-precision machines, e.g., in metal-cutting industry, were optical. Although other techniques are also now available, optical encoders are still predominant in industrial applications. ...

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