Linear induction motors
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United States of America Patent
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Jul 7, 1992
Grant Date -
N/A
app pub date -
Apr 25, 1991
filing date -
Apr 25, 1991
priority date (Note) -
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Abstract
Improvements in the primary and the secondary of linear induction motors for a SAILRAIL air bearing support and conveying systems increase the efficiency of such systems. In the primary the core includes a plurality of laterally adjacent toothed laminations with the edges of the teeth being complementarily curved to the curvature of the rail. The electrical windings extend around air ducts formed in the primary, improving cooling. Additional cooling is achieved by bleeding air to vertical nozzles in the core, the cooling bleed air also helping to support a runner as it passes over the primary. The secondary is provided in the runner and includes two sets of curved flexible plates held in a pocket in the runner adjacent the operating surface thereof. The inner plates are ferromagnetic and the outer plates are copper or aluminum and are generally wider than the inner plates. The inner plates can be made up of a plurality of adjacent sections with adjacent sections being connected together by a flexible tape or by a narrow tongue or linking section of the plate material.
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