Kone Elevator Gmbh

Elevator Gmbh

Risto Kontturi

Matti J Kahkipuro

Hannu Kulju

Pertti Saransaari

A method is disclosed for selecting different modes of operation of a means used for counting objects in a given area, such as persons waiting in an elevator lobby. In the method, the movements of the objects are monitored with at least one Doppler radar by observing the Doppler frequencies of the signals reflected by the objects. The method is characterized in that the operation of the means is switched between two modes of operation, so that the mode of operation primarily carrying out the counting of objects on the basis of their stopping and starting is used during a given time interval, and the mode of operation primarily observing merely the movements of the objects is used during another given time interval.

Method for selecting the mode of operation of an object counting means

An improvement of a thyristor converter drive wherein a thyristor converter drives a load, such as an electric machine, with which a series resonance circuit (1) has been connected in parallel. The components (2,3) of the series resonance circuit (1) are so selected that the charging phase and discharging phase of the circuit have equal length.

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Hyvinkaa, Finland

Risto Kontturi