Patent application number | Description | Published |
20080283341 | ELEVATOR SYSTEM - The invention relates to an elevator system and a method for reducing total power in an elevator system. According to the invention, the elevator system comprises at least one elevator without counterweight for moving people and/or goods, which elevator without counterweight comprises a power converter unit, an elevator motor, a traction sheave, a set of hoisting ropes and an elevator car, and which elevator system comprises means for storing mechanical energy and discharging an energy storage. | 11-20-2008 |
20090166134 | ELEVATOR SYSTEM - The present invention discloses and elevator system and a method for determining the position information of an elevator car. The elevator system according to the invention comprises at least one elevator car ( | 07-02-2009 |
20090284079 | APPARATUS AND METHOD FOR CONTROLLING THE MOTOR POWER - The invention concerns a power control apparatus and a method for supplying power between an electric machine and an energy source. The power control apparatus contains at least two converters comprising a plurality of switches, at least some of which switches belong to a set of switch modules comprising a plurality of switches. In the method of the invention, a first set of switches belonging to at least two different modules and arranged to form a first converter is controlled by a first converter control, and a second set of switches arranged to form a second converter is controlled by a second converter control. | 11-19-2009 |
20100051391 | SAFETY ARRANGEMENT - The present invention presents an arrangement and a method for monitoring a safety circuit. The system comprises a control appliance and the safety circuit comprises at least one serial circuit of two or more switches. The arrangement according to the invention comprises first means for measuring the status of at least one switch, as well as means, in connection with the first means, for conveying the status information of the switch to the control appliance. In the method according to the invention the status information of at least one switch is measured with the first means and the status information of the switch is sent to the control appliance using the first means for conveying the status information of the switch to the control appliance. | 03-04-2010 |
20100096931 | POWER CONTROL OF TRANSPORT SYSTEM - The power control of a transport system comprises an electric motor for moving the transport appliance as well as a power supply appliance of the motor, which comprises an intermediate circuit. The power supply appliance of the motor is fitted between the power source and the electric motor. The transport system further comprises a rectifier of the intermediate circuit power, which is fitted between the intermediate circuit of the power supply appliance of the motor and the supplied load for transmitting intermediate circuit power to the supplied load. | 04-22-2010 |
20100109596 | POWER SUPPLY APPLIANCE OF A TRANSPORT SYSTEM - The invention relates to a power supply appliance ( | 05-06-2010 |
20100117566 | POWER CONTROL OF A TRANSPORT SYSTEM - The power control of a transport system comprises an electric motor for moving the transport appliance as well as a power supply appliance of the motor, which comprises an intermediate circuit. The power supply appliance of the motor is fitted between the power source and the electric motor. The transport system further comprises a network rectifier, which is fitted between the power source and the intermediate circuit of the power supply appliance of the motor for supplying braking power returning from the motor of the transport appliance to the power source. | 05-13-2010 |
20100301793 | POWER SUPPLY ARRANGEMENT - 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. | 12-02-2010 |
20100327795 | CONVEYOR SYSTEM - A conveyor system includes an electric motor to move a conveyor. A voltage determining device is coupled to an alternating-electricity source that supplies alternating electricity to the conveyor system. A power supply appliance supplies power between the electric motor and the alternating-electricity source. The power supply appliance includes an inverter and an inverter control. The inverter includes a rectifying bridge and a motor bridge. The rectifying bridge input is coupled to the alternating-electricity source and the rectifying bridge output is coupled to the motor bridge input. The motor bridge output is coupled to the electric motor. The inverter control is coupled between the voltage determining device and the motor bridge. The inverter control is responsive to frequency and phase of the determined voltage of the alternating-electricity source to adjust the frequency and phase of the motor bridge output voltage such that the motor bridge output voltage is made to be essentially constant. | 12-30-2010 |
20120116574 | CONVEYING SYSTEM - A conveying system, includes control devices for controlling the operation of the conveying system. The conveying system also includes a central control. The central control is arranged to select from a plurality of the different operating modes of the conveying system the operating mode to be used at any given time. The central control is connected to the control devices with a communications channel for indicating the operating mode selected to the control devices. | 05-10-2012 |