Linear induction drive system for accelerating and...

B - Operations – Transporting – 65 – G

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335/1

B65G 17/00 (2006.01) B66B 23/02 (2006.01) H02K 41/025 (2006.01)

Patent

CA 1101948

ABSTRACT A linear induction drive system for an accelerating and decelerating moving walkway comprising a plurality of interconnected platforms that encompass the entire path of travel of the walkway and overlap one another by a small portion of their length in linear constant speed zones and by a substantial portion of their length in acceleration and deceleration zones is disclosed. The linear induction drive system comprises a plurality of stationary linear induc- tion motor stators located in the constant speed zones. Affixed to the platforms are reaction rails formed of a plurality of links rotatably attached to one another such that the links are linearly aligned with one another in the constant speed zones and fold in an accordian manner in the acceleration and deceleration zones. In the constant speed zone the reaction rails are driven by power applied to the linear induction motor stators. Due to the platform inter- connection this drive force moves the entire walkway. The links fold in a plane parallel to the plane of motion of the platforms. Preferably, a pair of links are associated with each platform--one link rotatably attached to each platform and the other links rotatably connecting the platform links together. Each link is flat and elongate, and comprises at least tow laminations. One lamination is formed of an electrical conducting nonmagnetic material, such as aluminum or copper. The other lamination is formed of a magnetic material, such as iron.

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