Electrical shaft system
AssigneeWestinghouse Electric Corp.
InventorLeonard P. Gripp
Life of this patent
Estimating the term…
Abstract
Two movable members driven by individual motors are positioned accurately at any given time and are tracking each other for all displacements. Individual positioning is used with differential positioning to force a follow-up of one member relative to the other. One feedback position loop provides a master reference for a second position loop of the slave motor drive, and the differential position signal makes the second loop operate as a vernier of the master loop. A limiter prevents the master drive from running ahead of the slave drive.
Claims1
A system for imparting to at least two members correlative displacements along separate trajectories, comprising a master drive motor mechanically coupled to one of said members as a master member, and at least one slave drive motor mechanically coupled to at least another member as a slave member;
- first control means continuously responsive to a first reference position and to incremental displacements of said master member for providing a first command signal for controlling said master drive motor and said slave drive motor to displace said master member and said slave member in accordance with said first reference position;
- second control means continuously responsive to a second reference position and to incremental displacements of said slave member for providing a second command signal for controlling said slave member;
- said second reference position representing actual positioning of said master member;
- and
- summer means interposed between said first and second control means and responsive to said first and second command signals for controlling said slave drive motor to maintain said slave member in alignment with said master member.
Dependencies are inferred from the claim text.