Otis Elevator Company

Herbert Horbrugger

Ismail Agirman

Virgilio Valdivia Guerrero

Daniel Diaz-Lopez

Mario Sanz Abia

Stephan Glessner

Michael Mann

Helmut L Schroder-Brumloop

Stefan Spannhake

Reinhard Henkel

A power management system for an elevator system. A power management system for an elevator system includes a power converter having three input terminals, two of the three input terminals coupled to a main power source for supplying single-phase AC power to the power management system, the power converter configured to convert the AC power from the main power source into DC power on a common DC bus, a secondary power source for supplying DC power to the common DC bus, a power inverter configured to invert the DC power on the common DC bus into AC output power for driving an electric motor of the elevator system, and a dynamic braking resistor which is coupled between a third input terminal among the three input terminals of the three-phase power converter and the common DC bus.

Power management in an elevator system

A power management system comprises an AC-power-source controller configured to control power supply between the AC power source and a common DC bus, the AC-power-source controller further configured to limit AC power supplied from the AC power source to the common DC bus to a first AC-power-source power limit; a power inverter configured to invert the DC power on the common DC bus into AC output power for driving the electric motor; a DC power source configured to supply DC power to the common DC bus; and a DC-power-source controller configured to control power supply between the DC power source and the common DC bus, the DC-power-source controller further configured to start supplying DC power from the DC power source to the common DC bus in response to a detection of a voltage drop on the common DC bus from a AC-power-source reference voltage to a DC-power-source reference voltage.

Decentralized power management in an elevator system

Process and device for controlling the drive of a conveyor system ( ), specifically in the form of an escalator or passenger conveyor, which can be switched from load to no-load operation, comprising a drive motor ( ) and a variable frequency converter ( ), which is at least controllable with respect to the frequency of its output voltage, wherein, under load, the drive motor ( ) is supplied with a line voltage with an essentially constant line frequency and, at no-load, is supplied the output voltage of the variable frequency converter's ( ), wherein, prior to a changeover from no-load to load operation, the output frequency of the variable frequency converter ( ) is essentially brought with phase accuracy to the line frequency by means of a PLL device ( ), and wherein this changeover is brought about as soon as this phase conformance has been realized.

Process for switching between mains supply and a frequency inverter and vice versa

An elevator system includes an electronic driver which transmits a multi-phased electric current through a relay to a motor driving an elevator car. Under normal operating conditions, the motor uses the current from the driver to move the elevator car in a hoistway. When electric power fails, the elevator car is moved by gravity for any necessary rescue or maintenance operations, and consequently moves the motor. The movement of the motor generates a multi-phased electric current therein. The generated current is utilized to power a display panel of a movement indicator, which is automatically connected to the motor by the relay when power fails in the elevator system. The powered display panel informs the operator of the direction and speed of travel of the elevator car.

Growing community of inventors

Berlin, Germany

Herbert Horbrugger