Abstract:
An adjustment device for controlling the electric drive of an elevator in connection with a voltage reduction of the supplying network is disclosed. The electric drive of an elevator includes an electric motor and a power supply apparatus of for adjusting the supply voltage of the electric motor. The adjustment device includes a device configured to control the power supply apparatus and also a speed regulator for adjusting the speed of the electric motor. The adjustment device is arranged to determine the output voltage of the power supply apparatus of the electric motor in relation to the permitted maximum value of the output voltage, and the adjustment device is arranged to interrupt the operation of the speed regulator but to continue the operation of the power supply apparatus of the electric motor when the output voltage of the power supply apparatus of the electric motor reaches the permitted maximum value.
Abstract:
A frequency converter and a method for determining the position of the rotor of an electric machine are provided. The frequency converter includes a load bridge and a control of the load bridge, for supplying electricity between the load bridge and an electric machine connected to the load bridge. The frequency converter includes a determination for at least one electrical parameter of the electric machine, and includes a determination for the position of the rotor of the electric machine. The load bridge is fitted to supply a first alternating electricity excitation signal, which is formed in relation to the electrical angle of the electric machine, to the electric machine. The frequency converter is further fitted to determine the first alternating electricity response signal corresponding to the first alternating electricity excitation signal, and the position of the rotor is determined on the basis of the first alternating electricity response signal.
Abstract:
Sistema de ascensor, que comprende: un miembro (1) de accionamiento; unos medios (3) de elevación, que se acoplan con el miembro (1) de accionamiento indicado anteriormente mediante tracción por fricción; en el que el sistema de ascensor comprende unos medios (4, 5, 6A, 6B, 7) de determinación de tracción para determinar la tracción del miembro (1) de accionamiento; y un circuito (4) de control, que está configurado para iniciar un procedimiento que garantiza la seguridad del sistema de ascensor una vez que los medios (4, 5, 6A, 6B, 7) de determinación de tracción han detectado que la tracción del miembro (1) de accionamiento se ha debilitado, de manera que el sistema de ascensor comprende una unidad (4) de control; caracterizado porque la unidad (4) de control indicada anteriormente está configurada para iniciar una carrera de prueba para comprobar la tracción del miembro (1) de accionamiento; y porque los medios (4, 5, 6A, 6B, 7) de determinación de tracción están configurados para determinar la tracción del miembro (1) de accionamiento en conexión con la carrera de prueba, y porque la cabina (10) de ascensor está configurada para moverse a una aceleración y/o una desaceleración incrementada en conexión con una carrera de prueba.
Abstract:
A transportation system and a method are provided for backing up the operational state of a transportation system. The transportation system includes a control apparatus for controlling the operation of the transportation system. The control apparatus further includes capacitive energy storage and a power supply backup circuit adapted to maintain power supply from the said energy storage to a storage circuit for a given length of time in connection with an operational anomaly in power supply to the control apparatus.
Abstract:
Methods and an apparatuses for determining the movement of a synchronous machine are provided. An apparatus for determining the movement of a synchronous machine includes a determination for at least one electrical magnitude of the synchronous machine; a determination of the position error of the rotor of the synchronous machine, which is fitted to determine the position error of the rotor on the basis of the aforementioned at least one electrical magnitude of the synchronous machine; and also a correction of the movement signal of the incremental sensor, which is fitted to correct the read movement signal of the incremental sensor on the basis of the aforementioned determination of the position error of the rotor of the synchronous machine.