Device and method for reducing the power of the supply connection in lift systems
First Claim
1. Device to reduce the power supply connection rating of elevator installations with electric drive systems which has an energy storage unit (11) for electric energy characterized in that the energy storage unit (11) contains capacitors in the form of supercapacitors (13).
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Accused Products
Abstract
Elevator installations with electric drive systems are equipped with devices (10) to reduce the power supply connection rating which have energy storage units (11) which are formed entirely or partly from so-called supercapacitors (13). The device (10) according to the invention has the effect on the one hand that power peaks during starting and braking operations are compensated by the exchange of energy between the storage unit (11) and motor supply, and on the other hand that the power consumption occurring during a trip is also spread over a part of the at-rest time. Supercapacitors (13) as energy stores tolerate by comparison with electrochemically acting accumulators a much higher number of charging and discharging cycles at high values of current.
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Citations
9 Claims
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1. Device to reduce the power supply connection rating of elevator installations with electric drive systems which has an energy storage unit (11) for electric energy characterized in that
the energy storage unit (11) contains capacitors in the form of supercapacitors (13).
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9. Method to reduce the power supply connection rating of elevator installations with electric drive systems, characterized in that
electric energy is stored in an energy storage unit (11) which contains capacitors in the form of supercapacitors (13) and that before each elevator trip the energy required for the forthcoming trip is determined based on available information such as the load situation and trip destination, that a check is made whether the energy content momentarily present in the energy storage unit (11) together with the continuous supply from the power supply is sufficient for the trip, and that if necessary the start is delayed until the energy storage unit is sufficiently charged.
Specification