Coded data generation or conversion – Phase or time of phase change – Synchro or resolver signal
Reexamination Certificate
2005-05-17
2005-05-17
Jeanglaude, Jean (Department: 2819)
Coded data generation or conversion
Phase or time of phase change
Synchro or resolver signal
C341S117000
Reexamination Certificate
active
06894629
ABSTRACT:
An A/D converter converts a sine and cosine wave output of a resolver to form a digital sine and cosine. A microcomputer uses an absolute value of digital sin θ as an address to retrieve θ from a memory containing angle values between 0° and 90°, if the absolute value of sin θ is between 0 and 0.707. Otherwise, if the absolute value of sin θ is between 0.707 and 1, cos θ is used as an address to retrieve θ. The polarities of sin θ and cos θ are used to determine a quadrant and an associated offset including 0°, 180°−θ, 180°+θ, and 360°−θ, which is combined with θ such that the final angle of the rotor axis is obtained.
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Domrachev V. G. et al., “Digital Encoders of Sine-Cosine Rotating Transformers Output Signals,”Measurement Techniques,Consultants Bureau, New York, vol. 30, No. 11, Nov. 1, 1987 pp. 1083-1088, XP000001285.
Adduci, Mastriani & Schaumberg, L.L.P.
Jeanglaude Jean
Minebea Co. Ltd.
Nguyen John B
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