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2017

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New Technology
Development of “Thin Type High Precision Angle Sensor”
(New name: “Multi Track Magnetic Ring”**)
April 26, 2017New Products

NTN Corporation (hereafter, NTN) has developed a “Thin Type High Precision Angle Sensor” for robot joints or similar applications. The developed product can detect angles with high precision and is both thin and lightweight. As a result, even more precise angle detection is realized compared with the conventional “Bearing with high-resolution rotary sensor*.”

In the recent robot market, there is a demand for accurate and high precision positioning for robots. NTN has developed an angle sensor that detects the rotational angle with high precision which is suitable for this type of need.

The current developed “Thin Type High Precision Angle Sensor” consists of a magnetic sensor and a double-track magnetic encoder that magnetizes a double-row magnetic track with different pole numbers to a rubber magnetic material after composite molding it with a ring part. With conventional encoders the N pole and S pole pair arrangement (pole pairs) had 32/31 pole pairs. However, this developed product has a 64/63 pole pair arrangement. Therefore, while sophisticated angle detection is possible, high precision magnetization techniques are required not to affect adjacent magnetic tracks. NTN has achieved using its unique high precision magnetization techniques.

In the near future, NTN will also develop an axial type in addition to the radial type developed this time. NTN will move forward with commercializing the “Thin Type High Precision Angle Sensor” and also commercializing sets consisting of this developed product and bearings while verifying market demand.

The developed product was exhibited at the Techtuit Co., Ltd. exhibition booth during Techno-Frontier Exhibition 2017 at Makuhari Messe.

* Press Release: Development of “Bearing with high-resolution rotary sensor”
https://www.ntnglobal.com/en/news/new_products/news20080303_1.html

**: The name of this product was changed to the new name of “Multi Track Magnetic Ring” from June 2018.

Features

(1) Lightweight and thin 27% reduction when compared to conventional products (conventional product size: outer diameter of approximately 25 mm)
(2) High precision Conventional product, angle precision of ±0.2° (excludes installation errors)
Developed product, angle precision of ±0.1° (excludes installation errors)

Application

  • Robot joint angle detection and similar applications

Inquiries about this release

Inquiry Form

Thin Type High Precision Angle Sensor

(a) External appearance(a) External appearance (b) Illustration of magnetic pattern(b) Illustration of magnetic pattern

(Outer diameter of 51.5 mm, inner diameter of 44.0 mm, width 8.2 mm, weight 10.7 g)

(c) Example of use(c) Example of use

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