Magnetic Rotation-Angle Sensor and Angle-Information Processing Device
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Abstract
A simple circuit configuration without increasing the number of magnetic poles of a magnet can be performed and angular resolution can be improved. The polarities is determined and the absolute values are compared in accordance with the rotation angle of a magnet (1) based on sensor output signals a and b outputted from the magnetic sensors (2) and (3) to produce polarity determination signals c and d and absolute-value-comparison signals e, f, and g. The rotation angle of the magnet (1) is determined based on the polarity determination signals c and d and the absolute-value-comparison signals e, f, and g to output a determination result signal h.
37 Citations
16 Claims
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1-9. -9. (canceled)
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10. A magnetic rotation-angle sensor comprising:
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a magnetic-pole generation means for generating one or more pairs of N-polarity and S-polarity magnetic poles;
a plurality of magnetic sensors, arranged around the magnetic-pole generation means, with a predetermined angle to the rotation center of the magnetic-pole generation means;
a plurality of polarity determination means for determining the polarities of sensor output signals outputted from the magnetic sensors and outputting polarity determination signals indicating the determined polarities;
a plurality of absolute-value generation means for generating absolute values corresponding to the sensor output signals outputted from the magnetic sensors;
a plurality of comparison-result output means for comparing the generated absolute values and outputting absolute value comparison signals indicating results of the comparison;
an angle determination means for determining rotation angle of the magnetic-pole generation means, based on the polarity determination signals and the absolute value comparison signals, and outputting a predetermined determination result signal; and
an addition means for adding at least two sensor output signals outputted from the magnetic sensors and then generating a third sensor output signal, wherein the third sensor output signal is inputted to at least one each of the plurality of polarity determination means and the plurality of absolute-value generation means to output polarity determination signals and absolute-value-comparison signals that correspond to the third sensor output signal; and
the angle determination means determines the rotation angle of the magnetic-pole generation means based on the polarity determination signals and the absolute-value-comparison signals, and then outputs a predetermined determination result signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification