Abstract: A method for the no-transmitter speed determination of an asynchronous machine, comprising the steps which follow: a module for field-oriented regulation calculates the voltages to be applied to the asynchronous machine on the basis of a setpoint for the speed, at least two values measured for the conductor current, and a speed calculated by an observer module, the observer module has applied thereto the voltage values obtained from the field-oriented regulation or the voltage values measured, and calculates a value of the moment-forming current îsq(t) and an inner moment Mi(t) of the asynchronous machine from the values applied, a moment module calculates a load moment Ml(t) acting upon the asynchronous machine from the difference of the moment-forming currents from the field-oriented regulation and the observer module, a speed module calculates the actual speed of the asynchronous machine via the load moment of the moment module and the inner moment of the observer module.

Abstract: A method for the no-transmitter speed determination of an asynchronous machine, comprising the steps which follow: a module for field-oriented regulation calculates the voltages to be applied to the asynchronous machine on the basis of a setpoint for the speed, at least two values measured for the conductor current, and a speed calculated by an observer module, the observer module has applied thereto the voltage values obtained from the field-oriented regulation or the voltage values measured, and calculates a value of the moment-forming current îsq(t) and an inner moment Mi(t) of the asynchronous machine from the values applied, a moment module calculates a load moment Ml(t) acting upon the asynchronous machine from the difference of the moment-forming currents from the field-oriented regulation and the observer module, a speed module calculates the actual speed of the asynchronous machine via the load moment of the moment module and the inner moment of the observer module.

Abstract: The present invention provides method and apparatus for determining a cell border between first (A) and second (B) cells in a cellular communications system, such as GPRS, in which communications with mobile stations (1, 1H) can be effected at different effective transfer rates (CS1 to CS4) in dependence upon communication conditions, and can be handed over from the first cell (A) to the second cell (B). Information relating to the transfer rates (CS1 to CS4) of communications with mobile stations immediately before and after cell handover from the first cell (A) to the second cell (B) is stored. The stored information is subject to analysis and processing, and in dependence on the results the cell border between the first (A) and the second (B) cell is determined such that, at handover, transfer rates (CS1 to CS4) before and after handover are more likely or most likely to be the same.

Abstract: The invention relates to a device for identifying gaseous compounds, comprising a sensor array (1) having, for instance, ten gas sensors (2) in the form of semiconductor gas sensors. Said sensor array (1) has a supply line (3) with an inlet (4) and an outlet (5). A switchable three-way valve (6) is located in the supply line (3), to which a selective collector unit (7) is attached. Said collector unit (7) comprises a special adsorber (8), a heater (9) and a separate feed pump (10) with a flow sensor (11). A secondary line (12), in which a dilution unit (13) is arranged, discharges into the feed line (3) between the three-way valve (6) and the sensor array (1). A feeding and control unit (16) also having a feed pump (17) with a flow sensor (18) is located in the area of the outlet (5) of the sensor array (1). An electrical line (19) leading to an evaluation computer (20) branches off from the sensor array (1).

Abstract: The invention relates to a fork-lift truck including a vehicle body which has rear wheels and a lift frame for load-carrying means, and including a wheel bearing means. For an increase in stability in standing of the fork-lift truck, a shifting or pivoting device interacting with the vehicle body is provided, which moves the wheel bearing means with respect to the vehicle body while varying the axle base and the distance of the load center from the front wheel.