Abstract: An elevator system includes an elongated suspension member, a load-receiving part suspended on the suspension member, a counterweight suspended on the suspension member for supporting the load-receiving part, an elongated traction member for exerting a pulling force on the load-receiving part and on the counterweight, a drive unit, with which the load-receiving part is driven by pulling the traction member and also one or more guide rails, along the path of movement determined by which the load-receiving part is moved. The drive unit is disposed to the side of the path of movement of the load-receiving part.

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: The invention relates to an electrical power system for operating elevators. The electrical power system includes: an electricity distribution network of a building, which includes an interface to a public electricity network; a plurality of hoisting machines of an elevator, each of which hoisting machines of an elevator is equipped to move an elevator car in an elevator hoistway; and also a power supply system, which includes an interface to the aforementioned hoisting machines of the elevator, and which power supply system includes an interface to the electricity distribution network of the building, for supplying power between the hoisting machines of the elevator and the electricity distribution network of the building.

Abstract: An elevator system and a method for monitoring the operating condition of an elevator system are disclosed. In the method, samples are taken of the control signal of the drive device of the elevator, from the series of samples taken a frequency component is determined that is characteristic to the part of the elevator assembly driven with the drive device, and also the operating condition of the part of the elevator assembly is monitored on the basis of the determined frequency component.

Abstract: A power supply system of a transport system includes: a direct-current intermediate circuit; a motor bridge connected to the direct-current intermediate circuit, for supplying power between the direct-current intermediate circuit and the motor that moves the transport appliance; and also an energy storage and a direct-current converter based on indirect power transmission connected between the energy storage and the direct-current intermediate circuit, for controlling the power supply between the energy storage and the direct-current intermediate circuit. The direct-current converter based on indirect power transmission includes: a controllable solid-state switch, for disconnecting the power supply occurring from the energy storage.

Abstract: A transport system includes a motor for moving the transport appliance and a power supply circuit of the motor. The power supply circuit is connected between the motor and a power source that is limited (Plim) in its dimensioning. An energy storage that is limited (Elim) in its capacity is fitted in connection with the power supply circuit of the motor. The control arrangement includes a determination of the charging status (EQ) of the energy storage; a determination of the movement reference of the transport appliance; and a control of the movement of the transport appliance as a response to the determined movement reference of the transport appliance. The movement reference of the transport appliance is determined on the basis of the amount of energy that can be discharged from the energy storage and/or on the basis of the amount of energy that can be charged into the energy storage as well as on the basis of the travel distance of the transport appliance.

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: The invention relates to an electrical power system for operating elevators. The electrical power system comprises: an electricity distribution network of a building, which comprises an interface to a public electricity network; a plurality of hoisting machines of an elevator, each of which hoisting machines of an elevator is equipped to move an elevator car in an elevator hoistway; and also a power supply system, which comprises an interface to the aforementioned hoisting machines of the elevator, and which power supply system comprises an interface to the electricity distribution network of the building, for supplying power between the hoisting machines of the elevator and the electricity distribution network of the building.

Abstract: The invention relates to a braking apparatus, an electric drive and an elevator system. The braking apparatus comprises an apparatus for dynamic braking, for braking an electric machine with dynamic braking, an input for the control signal of the braking apparatus, and also a controller, for controlling the apparatus for dynamic braking as a response to the aforementioned control signal of the braking apparatus.

Abstract: The invention relates to a frequency converter, which is fitted to supply power between a polyphase alternating electricity source and an electric machine. The frequency converter comprises a network rectifier connected to the alternating electricity source and an inverter connected to the electric machine. The power supply is implemented in the network rectifier and in the inverter with solid-state change-over switches, which change-over switches comprise an antiparallel-connected diode fitted in parallel with the controllable switch. The network rectifier and the inverter are connected to each other with an intermediate circuit, which intermediate circuit is implemented without a passive energy storage.

Abstract: A power supply system of a transport system includes: a direct-current intermediate circuit; a motor bridge connected to the direct-current intermediate circuit, for supplying power between the direct-current intermediate circuit and the motor that moves the transport appliance; and also an energy storage and a direct-current converter based on indirect power transmission connected between the energy storage and the direct-current intermediate circuit, for controlling the power supply between the energy storage and the direct-current intermediate circuit. The direct-current converter based on indirect power transmission includes: a controllable solid-state switch, for disconnecting the power supply occurring from the energy storage.

Abstract: A fail-safe power control apparatus for supplying power between an energy source and the motor of a transport system. The power control apparatus includes a power supply circuit, which has at least one converter containing controllable change-over switches, and the power control apparatus has a controller for controlling the converter change-over switches, a data transfer bus, at least two controllers adapted to communicate with each other, and a control arrangement for controlling a first braking device, and possibly a control arrangement for controlling a second braking device.

Abstract: A transport system includes a motor for moving the transport appliance and a power supply circuit of the motor. The power supply circuit is connected between the motor and a power source that is limited (Plim) in its dimensioning. An energy storage that is limited (Elim) in its capacity is fitted in connection with the power supply circuit of the motor. The control arrangement includes a determination of the charging status (EQ) of the energy storage; a determination of the movement reference of the transport appliance; and a control of the movement of the transport appliance as a response to the determined movement reference of the transport appliance. The movement reference of the transport appliance is determined on the basis of the amount of energy that can be discharged from the energy storage and/or on the basis of the amount of energy that can be charged into the energy storage as well as on the basis of the travel distance of the transport appliance.

Abstract: An elevator system and a method are provided for controlling an elevator group. The elevator system includes an elevator group, which includes at least two elevator cars, which elevator cars are fitted to be moved in the elevator hoistway according to the calls allocated by the control of the elevator group. The elevator system includes a power supply arrangement, for adjusting the power needed to move the elevator cars. An energy storage is connected to the power supply arrangement. The energy storage is fitted in the first operating situation to yield energy for use in moving the elevator car, and in the second operating situation to receive energy released by movement of the elevator car. The elevator system includes a determination of the charging status of the energy storage, and the control of the elevator group is fitted to determine the change in energy that would be caused by the movement according to an allocated call of the elevator cars belonging to the elevator group.

Abstract: The invention concerns a method and an apparatus for controlling a three-or-more-phase motor driven by a frequency converter. In the method, a change-over switch of the frequency converter is controlled to a continuously conducting state and at the same time the phase voltages or phase currents of the other phases are controlled by switching the change-over switches in those motor phases at a switching frequency substantially higher than the frequency of the fundamental wave of the phase voltage or phase current. The apparatus comprises in conjunction with the frequency converter a number of change-over switches, at least one change-over switch for each motor phase. The change-over switches comprise controllable change-over contacts. The apparatus further comprises in conjunction with the frequency converter means for determining the motor phase currents and means for controlling the change-over contacts.

Abstract: The invention relates to a method and an appliance for monitoring the safety of a transport system. The transport system includes a transport appliance and also a synchronous motor for moving the transport appliance. In the method, the motion information of the transport appliance is determined with two channels, and if the determined motion informations deviate from each other by more than the set limit value, an emergency stop is executed.

Abstract: An elevator system and a method are provided for controlling an elevator group. The elevator system includes an elevator group, which includes at least two elevator cars, which elevator cars are fitted to be moved in the elevator hoistway according to the calls allocated by the control of the elevator group. The elevator system includes a power supply arrangement, for adjusting the power needed to move the elevator cars. An energy storage is connected to the power supply arrangement. The energy storage is fitted in the first operating situation to yield energy for use in moving the elevator car, and in the second operating situation to receive energy released by movement of the elevator car. The elevator system includes a determination of the charging status of the energy storage, and the control of the elevator group is fitted to determine the change in energy that would be caused by the movement according to an allocated call of the elevator cars belonging to the elevator group.

Abstract: A fail-safe power control apparatus for supplying power between an energy source (4) and the motor (5) of a transport system is provided. The power control apparatus comprises a power supply circuit (6), which comprises at least one converter (7, 8) containing change-over switches (32). The power control apparatus comprises a control arrangement (24) for controlling the converter change-over switches, a data transfer bus (10), at least two controllers (1, 2) adapted to communicate with each other, and a control arrangement (11) for controlling a first braking device, and possibly a control arrangement (43) for controlling a second braking device.

Abstract: The invention relates to a method and an appliance for monitoring the safety of a transport system (1). The transport system comprises a transport appliance (2) and also a synchronous motor (3) for moving the transport appliance. In the method the motion information of the transport appliance is determined with two channels, and if the determined motion informations deviate from each other by more than the set limit value, an emergency stop is executed.

Abstract: The invention relates to a frequency converter, which is fitted to supply power between a polyphase alternating electricity source and an electric machine. The frequency converter comprises a network rectifier connected to the alternating electricity source and an inverter connected to the electric machine. The power supply is implemented in the network rectifier and in the inverter with solid-state change-over switches, which change-over switches comprise an antiparallel-connected diode fitted in parallel with the controllable switch. The network rectifier and the inverter are connected to each other with an intermediate circuit, which intermediate circuit is implemented without a passive energy storage.