BALL ROTATION AMOUNT MEASUREMENT SYSTEM

Title:

BALL ROTATION AMOUNT MEASUREMENT SYSTEM

Document Type and Number:

WIPO Patent Application WO/2018/180076

Kind Code:

A1

Abstract:

This ball rotation amount measurement system is capable of highly accurately measuring the amount of rotation of a ball. This ball rotation amount measurement system (1) is provided with a magnetic sensor (2) that is fixed to a ball and is for measuring geomagnetism in at least one axial direction and a calculation unit (3) for using a plurality of items of geomagnetic data acquired sequentially by the magnetic sensor (2) to calculate the amount of rotation of the ball. The calculation unit (3) has a difference data calculation unit (31) for calculating difference data consisting of differences between pairs of sequentially adjacent items of magnetic data and thereby sequentially obtaining a plurality of items of difference data, a difference waveform calculation unit (32) for determining a difference waveform that is the waveform of the temporal variation of the plurality of items of difference data, and a rotation amount calculation unit (33) for calculating the ball rotation amount on the basis of information about a zero-cross point at which the difference waveform crosses a straight line of zero difference in a prescribed period.

Inventors:

YAMAMOTO MICHIHARU (JP)
URAKAWA KAZUO (JP)
MORI MASAKI (JP)

Application Number:

PCT/JP2018/006738

Publication Date:

October 04, 2018

Filing Date:

February 23, 2018

Export Citation:

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Assignee:

AICHI STEEL CORP (JP)

International Classes:

G01P3/44; A63B43/00; G01B7/30

Domestic Patent References:

WO2007099599A1

2007-09-07

Foreign References:

US20160001136A1	2016-01-07
US20140349267A1	2014-11-27
JP2014514946A	2014-06-26
JPS55154410A	1980-12-02
JPS49128500A	1974-12-09
JP2014160025A	2014-09-04
JP2017026427A	2017-02-02

Other References: