| Patent application number | Description | Published |
|---|
| 20090167218 | METHOD AND APPARATUS FOR BRAKING A MOTOR - The invention relates to a method and an arrangement for braking a synchronous motor ( | 07-02-2009 |
| 20090322273 | METHOD AND APPARATUS FOR CONTROLLING A MOTOR - 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. | 12-31-2009 |
| 20100032246 | FAIL-SAFE POWER CONTROL APPARATUS - The invention relates to a fail-safe power control apparatus ( | 02-11-2010 |
| 20100038185 | FAIL-SAFE POWER CONTROL APPARATUS - The invention relates to a fail-safe power control apparatus ( | 02-18-2010 |
| 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 |
| 20100308762 | SAFETY ARRANGEMENT OF A TRANSPORT SYSTEM - The invention relates to a method and an appliance for monitoring the safety of a transport system ( | 12-09-2010 |
| 20110120811 | ELEVATOR SYSTEM AND METHOD OF CONTROLLING AN ELEVATOR GROUP - 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. The control of the elevator group is fitted to allocate a call by favoring in the allocation an elevator car, the determined change in energy caused by the movement of which best meets the allocation criterion. | 05-26-2011 |
| 20120010751 | ARRANGEMENT AND METHOD IN CONNECTION WITH A TRANSPORT SYSTEM - 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 (P | 01-12-2012 |
