Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Plural linear-movement motors
Patent
1988-05-17
1989-08-01
Salce, Patrick R.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Plural linear-movement motors
318135, 310 12, H02K 4100
Patent
active
048536024
ABSTRACT:
A system useful for controlling multiple secondaries of a linear disposed motor along an elongated path, with the system having a linear synchronous motor with its elongated primary disposed along the elongated path and at least one secondary responsive to the primary with means disposed thereon for attachment to a body to be propelled along the path, a plurality of linear synchronous motor drivers for providing inputs to designated coil windings of the primary for developing a traveling electromagnetic wave along the primary, a driver controller means connected to each motor driver which has plurality of memory sections for storing therein characteristics of waveforms for use in the system of the invention, a central controller for controlling the output of the plurality of driver controller means and a system computer for down loading instructions for the various waveform patterns to the memories of the driver controller means and for overall supervisory control of the system of the invention. The system is particularly useful for continuously drawing a web of material by attaching the synchronous secondaries to carriages having tenter clips attached; the tenter clips clipped to the outer edges of the film serve to carry the film through stretching and stabilizing zones to provide a novel film, particularly a novel biaxially oriented polyethylene terephthalate film.
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Hommes William J.
Keegan, Jr. John J.
E. I. DuPont de Nemours and Company
Jones Judson H.
Salce Patrick R.
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