Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Satoshi Watanabe0
Seiki Sakata0
Date of Patent
April 28, 2009
0Patent Application Number
118971360
Date Filed
August 28, 2007
0Patent Primary Examiner
Patent abstract
A current measuring device measures the current flowing through each conductor which connects a power supply with a motor. Coreless current sensors are arranged between pairs of the conductors. Coefficients which represent a relationship between a fixed standard current flowing through a conductor and the output signal from coreless current sensors for the fixed standard current are obtained in advance from known measurements. A calculator then determines the current flowing through each conductor based upon the corresponding output signals from the coreless current sensors, the measured coefficients and formula Iu+Iv+Iw=0.
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