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Title: US4825111: Linear motor propulsion system
[ Derwent Title ]

Country: US United States of America

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23 pages

Inventor: Hommes, William J.; Hockessin, DE
Keegan, Jr., John J.; Wilmington, DE

Assignee: E. I. Du Pont de Nemours and Company, Wilmington, DE
other patents from E. I. DU PONT DE NEMOURS AND COMPANY (165265) (approx. 15,067)
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Published / Filed: 1989-04-25 / 1987-11-02

Application Number: US1987000115791

IPC Code: Advanced: B60L 13/03; B60L 15/00; B65G 54/02; H02K 41/02; H02K 41/03; H02P 25/06;
IPC-7: B60L 13/00; B60L 15/38; B65G 43/10; H02K 41/02;

ECLA Code: B60L15/00B1; H02K41/02; L60L220/14; L60L200/26; Y02T10/64B; Y02T10/64D4;

U.S. Class: Current: 310/012.15; 104/290; 104/299; 198/465.2; 198/619; 310/012.04; 310/012.11; 310/012.18; 310/012.24; 318/135;
Original: 310/012; 104/290; 104/299; 198/465.2; 198/619; 318/135;

Field of Search: 104/290,292,294,295,299,301 198/465.2,619,690.1,795,803.01 310/012,112,114,DIG. 2 318/038,135,685,687,696,47

Priority Number:
1987-11-02  US1987000115791
1989-01-30  WO1989US0000383

Abstract:     A system for propelling individual carriages along an endless path from a first speed abutted in a stack in a carriage collection section, to a second speed spaced apart in an operational section, and to a third speed in a stack-forming section where the carriages return to the first speed in the stack. Novel carriages are propelled by a linear motor wherein each carriage has attached a synchronous and a hysteresis secondary. A first primary positioned adjacent one part of the path develops electromagnetic waves for engaging the synchronous secondaries to provide controlled spacing of the carriages, and a second primary adjacent another part of the path develops other electromagnetic waves for engaging the hysteresis secondaries to provide controlled abutting of the carriages.

Primary / Asst. Examiners: Wong, Peter S.; Rebsch, D. L.

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First Claim:
Show all 57 claims
We claim:     1. A method of controlling the propulsion of carriages traveling along an endless path including the steps of:
  • forming a stack of carriages;
  • controlling the movement of carriages in the stack in a carriage collection section, such collection section having an entrance and exit;
  • propelling the carriages in the collection section at a first constant speed;
  • propelling the carriages one by one from the exit of the collection section and into an operational section, and propelling the carriages through the operational section from the first speed to a second speed greater than the first speed whereby such carriages are spaced apart; and
  • propelling the spaced apart carriages into and through a stack forming section wherein such carriages are propelled from the second speed to a third speed prior to reaching the trailing carriage in the stack of carriages traveling at the first speed before such carriages reach the entrance of the collection section; and
  • wherein the third speed acts to propel the carriages into controlled abutment with the trailing carriage in the stack.

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Forward References: Show 62 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (62)   |   Backward references (11)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 11pp US3068373  1962-12 Bekey   Synchronous motors of the hysteresis type
Get PDF - 6pp US3150433  1963-07 Kampf   Stretching machine
Get PDF - 5pp US3256558* 1966-06 Andersen et al.    
Get PDF - 37pp US3803466  1974-04 Starkey  Rockwell International Corporation LINEAR MOTOR PROPULSION SYSTEM
Get PDF - 9pp US3890421  1975-06 Habozit  La Cellophane Method for biaxially drawing plastic films
Get PDF - 22pp US3904941  1975-09 Matsui  Japanese National Railways Drive power supply system for thyristorized linear motor utilizing feeder section switches controlled by position detectors for controlling the energization of ground coils
Get PDF - 10pp US3932919  1976-01 Hutzenlaub et al.  Erwin Kampf Maschinenfabrik Improved gripper return means for a machine for simultaneously biaxially stretching thermoplastic film
Get PDF - 8pp US4081723  1978-03 Vetter et al.  Veb Polygraph Leipzog Kombinat fur Polygraphische Maschinen und Ausrustungen Printing machine
Get PDF - 7pp US4637103  1987-01 Hutzenlaub  Kampf GmbH & Co. Maschinenfabrik Simultaneous biaxial stretching machine for thermoplastic film webs
Get PDF - 26pp US4675582  1987-06 Hommes et al.  E. I. Du Pont De Nemours and Company System useful for controlling multiple synchronous secondaries of a linear motor along an elongated path
  * some details unavailable
Foreign References:
Publication Date IPC Code Assignee   Title
  JP48038779 1973-10       

Other References:
  • Watkins et al., "Evolution of a Linear Induction People Mover System", 28th IEEE Vehicular Tech. Conf. Denver, Colo., Mar. 22-24, 1978, pp. 133-136, WED Enterprises, Walt Disney Productions.

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