Nidec Machine Tool Corp.
MPLW series electromagnetic-induction-type linear position detector.

New-Concept Linear Position Detector

April 7, 2022
An electromagnetic-induction linear position detector digitally detects machines' positioning, feed, and more, eliminates the need for scale wiring and analog-digital converters.

NIDEC MACHINE TOOL CORP. has developed an electromagnetic-induction linear position detector that digitally detects machines' positioning, feed, and other information. With resolution and accuracy equal to conventional models, the MPLW series uses a newly developed signal detection method and highly integrated substrates, with no need for scale wiring and an analog-digital converter.

The MPLW series is a high-accuracy scale with a resolution of 0.01 µm and a pitch accuracy of S µm, and it is used to detect the positions of general machinery's linear axes. The conventional model, MPLZ series, would install a scale and a slider to a machine to connect a wire from the two, and transmit and receive electric signals with an NC (numerical control) device.

However, the Nidec’s newly developed detection pattern, which receives signals from a scale without mutual interference, has eliminated the need of scale wiring. In addition, to build inside the slider the function for an A/D converter to change electric signals from a scale into digital signals, the company has developed a highly integrated substrate structure, enabling transmission and reception of signals with a machine's control unit by using a scale and a slider only. The development of these technologies has eliminated the need of using scale wiring and an A/D converter, reduced the number of required components, and shortened the manufacturing process, while significantly simplifying the installation work at our customers.

Furthermore, the newly added function of installing multiple sliders into a single scale makes the MPLW series available for a wide variety of applications.

The electromagnetic induction method, the MPLW series' most prominent feature, possesses excellent durability that keeps detection accuracy from being affected by dust, oil, or condensation. Combined with other characteristics such as long and stable accuracy maintenance and thermal resistance based on a complete non-contact structure, this method is supported by various fields of industry.

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