| 摘要 |
In an angle computation method and apparatus for a variable reluctance resolver, the maximum values V<SUB>sin</SUB>(max) and V<SUB>cos</SUB>(max) of sine and cosine output voltages in respective positive value ranges and the minimum values V<SUB>sin</SUB>(min) and V<SUB>cos</SUB>(min) of the sine and cosine output voltages in respective negative value ranges are extracted, and on the basis of these values, offset values, amplitude values, sin-cos voltage ratio, and a zero-point correction value are obtained in accordance with the following equations: <?in-line-formulae description="In-line Formulae" end="lead"?>V<SUB>SINOFFSET</SUB>=(V<SUB>sin</SUB>(max)+V<SUB>sin</SUB>(min))/2<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>V<SUB>SINAMP</SUB>=(V<SUB>sin</SUB>(max)-V<SUB>sin</SUB>(min))/2<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>theta<SUB>SINPHASE</SUB>=sin<SUP>-1</SUP>(V<SUB>SINOFFSET</SUB>/V<SUB>SINAMP</SUB>)≅V<SUB>SINOFFSET</SUB>/V<SUB>SINAMP</SUB><?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>V<SUB>COSOFFSET</SUB>=(V<SUB>cos</SUB>(max)+V<SUB>cos</SUB>(min))/2<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>V<SUB>COSAMP</SUB>=(V<SUB>cos</SUB>(max)-V<SUB>cos</SUB>(min))/2<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>K=V<SUB>SINAMP</SUB>/V<SUB>COSAMP</SUB><?in-line-formulae description="In-line Formulae" end="tail"?> On the basis of the thus-obtained values, an angle theta is obtained in accordance with the following equation: <?in-line-formulae description="In-line Formulae" end="lead"?>F(V<SUB>sin</SUB>-V<SUB>SINOFFSET</SUB>, K(V<SUB>cos</SUB>-V<SUB>COSOFFSET</SUB>), theta<SUB>SINPHASE</SUB>)=theta.<?in-line-formulae description="In-line Formulae" end="tail"?>
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