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Apparatus and method for generating digital position signals for a rotatable shaft    
United States Patent5646496   
Link to this pagehttp://www.wikipatents.com/5646496.html
Inventor(s)Woodland; Lane L. (Burlington, CT); Marvin; Daryl J. (Unionville, CT)
AbstractAn apparatus and method for generating digital electrical signals which are representative of the angular position and rotational velocity of a rotatable shaft in a servomechanism includes a resolver which is connected to the rotatable component. The resolver generates analog electrical output signals which are representative of an excitation signal modulated by both the sine and cosine of the electrical angular position of the motor. The output signals from the resolver are fed to a digital signal processing circuit which employs software algorithm techniques to define a plurality of tasks which are implemented sequentially to obtain the desired angular position and velocity signals. First, the sine and cosine signals are read from the resolver through respective analog-to-digital converters. The sine and cosine signals are demodulated by multiplication with the excitation signal, and the undesired higher frequency components are deleted by filtering. Then, the demodulated sine and cosine signals are conditioned to insure quadrature and to correct for amplitude and offset variations. Next, an electrical angular position signal for the rotatable member is determined by combining the demodulated and conditioned sine and cosine signals, and a correction is made for repeatable harmonic errors. A calculation is then made to o determine the rotational velocity of the rotatable member. The electrical angular position signal is next corrected for velocity related errors to generate an actual electrical position signal. Lastly, an actual mechanical position signal for the rotatable member is calculated. The actual mechanical position signal can be fed to a position controller circuit as a feedback signal to provide a closed loop servomechanism.
   














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Apparatus and method for generating digital position signals for a rotatable shaft - US Patent 5646496 Drawing
Apparatus and method for generating digital position signals for a rotatable shaft
Inventor     Woodland; Lane L. (Burlington, CT); Marvin; Daryl J. (Unionville, CT)
Owner/Assignee     Dana Corporation (Toledo, OH)
Patent assignment
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Publication Date     July 8, 1997
Application Number     08/619,267
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     March 18, 1996
US Classification     318/632 318/779 341/115 341/116
Int'l Classification     G05B 019/31
Examiner     Ip; Paul
Assistant Examiner    
Attorney/Law Firm     MacMillan, Sobanski & Todd
Address
Parent Case     CROSS REFERENCE TO RELATED APPLICATION This application is a continuation of Ser. No. 08/336,317 filed Nov. 8, 1994, now abandoned.
Priority Data    
USPTO Field of Search     318/138 318/245 318/254 318/439 318/560 318/561 318/562 318/563 318/564 318/565 318/566 318/567 318/568 318/569 318/570 318/571 318/572 318/573 318/574 318/575 318/576 318/577 318/578 318/579 318/580 318/581 318/582 318/583 318/584 318/585 318/586 318/587 318/588 318/589 318/590 318/591 318/592 318/593 318/594 318/595 318/596 318/597 318/598 318/599 318/600 318/601 318/602 318/603 318/604 318/605 318/606 318/607 318/608 318/609 318/610 318/611 318/612 318/613 318/614 318/615 318/616 318/617 318/618 318/619 318/620 318/621 318/622 318/623 318/624 318/625 318/626 318/627 318/628 318/629 318/630 318/631 318/632 318/633 318/634 318/635 318/636 318/637 318/638 318/639 318/640 318/641 318/642 318/643 318/644 318/645 318/646 318/647 318/648 318/649 318/650 318/651 318/652 318/653 318/654 318/655 318/656 318/657 318/658 318/659 318/660 318/661 318/662 318/663 318/664 318/665 318/666 318/667 318/668 318/669 318/670 318/671 318/672 318/673 318/674 318/675 318/676 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Patent Tags     generating digital position signals a rotatable shaft
   
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