ELECTRICAL MACHINE APPARATUS AND ROBOT
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United States of America Patent
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Issued Date -
Jul 19, 2012
app pub date -
Jan 18, 2012
filing date -
Jan 19, 2011
priority date (Note) -
Abandoned
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Abstract
An electrical machine apparatus includes an electromagnetic coil, a rotor magnet, n (n is an integer not less than 2) magnetic sensors to detect an electric angle of the rotor magnet, and a position detection part to detect a position of the rotor magnet by using outputs of the magnetic sensors. Each of the magnetic sensors generates a sensor output signal having a curved line waveform and a period of electric angle 2π of the electrical machine apparatus. The respective n magnetic sensors are arranged to generate the sensor output signals with a phase difference other than an integer times π in electric angle. The position detection part calculates a movement amount of the rotor magnet from a starting point as a position before movement by using the sensor output signals of the n magnetic sensors.
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