Drive system for lifts

Details Drive system for lifts Drive system for lifts

1997-01-06

1998-05-12

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Linear

187250, H02K 4100, B66B 1104

Patent

active

057510768

ABSTRACT:
A drive system for lifts uses a single-sided flat permanent magnet linear synchronous motor. A secondary element equipped with permanent magnets is located along the shaft and a primary element provided with coils is mounted to the cage. The primary element moves with the cage along the secondary element arranged along the shaft. The secondary element also serves as guide element for the primary element. Bearings mounted to the primary element maintain a constant air gap between the secondary element and the primary elements. With this compact drive system, the needed energy demand of the weight of the drive can be kept small. In addition, the dimensions of the lift shaft can be reduced to a minimum by the resulting compact mode of construction of the drive particularly when strong permanent magnets are used.

REFERENCES:
patent: 5117136 (1992-05-01), Kobayashi et al.
patent: 5141082 (1992-08-01), Ishii et al.
patent: 5158156 (1992-10-01), Okuma et al.
patent: 5203432 (1993-04-01), Grinaski
patent: 5299662 (1994-04-01), Reddy et al.

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