摘要:
The invention concerns a method for controlling the drive and/or braking power of a locomotive engine at the wheel traction limit, the method calling for the transition to the unstable slip region to be detected by virtue of the increase in wheel speed and the drive or braking power reduced to bring the wheels back into the stable slip region and the drive or braking power subsequently reduced again, etc. In the case of a system operating, with an integrator (13), as a pseudo-dead-axle system, the rpm (frot) of a drive axle is used to calculate an rpm difference (Δn) representing the degree of wheel slip. Using a differentiator (22) to calculate the value of dΔn/dt, the transition to the unstable slip region is determined and, on triggering of a limiting-value stage (43), an additional input parameter acting in opposition to the target value with which it is compared is fed to the integrator (13) until the system returns to the stable slip region. In order to avoid losses in tractive power when traction fails suddenly, the invention proposes that, in addition to the reduction in drive or braking power resulting from calculation of the rpm difference (Δn), a further reduction is made which is dependent on the maximum value reached by the first differential function with respect to time (dΔn/dt) of the difference in rpm (Δn).
摘要:
Electric capacitor with at least a coil (10) within a container (13), containing a liquid or solid filling material and a residual air cushioning. If a solid filling material is used, its softening temperature is at most 15oC above the maximum operating temperature of the capacitor. The provision of at least a molecular sieve (19, 20, 21) as a drying element prevents the liquid or temporarily liquified material (17) from carrying the residual water towards the active zones of the coil. The minimum size of the sieve particles is larger than the gap between the coil layers, so as to prevent said particles from penetrating between said layers.
摘要:
A process is disclosed for regulating a four-quadrant regulator (1) that works as a mains power converter. The output of the four-quadrant regulator (1) feeds three-phase current drives through a direct voltage intermediate circuit (5) and a pulse-controlled inverter (6) and its input is connected to an alternating voltage network (4), preferably through a multiple winding transformer (2). The alternating voltage network (4) has secondary windings (8, 9) for the four-quadrant regulator (1) and additional consumers, for example auxiliary frequency converters (10) and a noise limiter set (3). This process is particularly suitable for catenary-powered three-phase locomotives. In order to actively and adequately limit with a simple process both 100 Hz parasitic currents and other low-frequency parasitic currents in the signalling frequency range, in particular 42 Hz parasitic currents, the current regulation carried out by the four-quadrant regulator (1) is supplemented by a parasitic current regulation (16) tuned to a current harmonic to be reduced in the power line current (if). The current harmonic is periodically sensed and appropriately decomposed into active and reactive components, for example into two orthogonal components or into components with different intensities and angles, that are in turn supplied to two separate parasitic current regulating circuits (16) that are set to maintain defined set values (wa3f, wb3f), preferably equal to zero, and whose output supplies set values (wa3, wb3) for the current harmonic components to be regulated by the four-quadrant regulator (1).
摘要:
The invention pertains to a drive unit for electric rail vehicles wherein the hub (7) of a large wheel (6) driven by an electric traction motor (1) with a pinion shaft (4) forms a quill stub that encompasses the shaft (9) of a wheelset with defined play. Upon intermediate shifting of a coupling (11) which is radially fixed but does allow transverse and angular movement, the motor torque is transmitted to one of the wheels (10) of the wheelset. The axial mobility of the coupling should not entail any restoring or elastic forces. To that end the hub-side coupling half (11b) with spiral outer toothing engages the wheel-side coupling half (11a) with its straight inner toothing. The wheel-side coupling half (11a) is detachably connected via coupling supports to the inside flank of a disk wheel (10) and the hub-side coupling half (11b) to the hub.
摘要:
The invention pertains to a drive unit for electric rail vehicles wherein the hub (7) of a large wheel (6) driven by an electric traction motor (1) with a pinion shaft (4) forms a quill stub that encompasses the shaft (9) of a wheelset with defined play. Upon intermediate shifting of a coupling (11) which is radially fixed but does allow transverse and angular movement, the motor torque is transmitted to one of the wheels (10) of the wheelset. The axial mobility of the coupling should not entail any restoring or elastic forces. To that end the hub-side coupling half (11b) with spiral outer toothing engages the wheel-side coupling half (11a) with its straight inner toothing. The wheel-side coupling half (11a) is detachably connected via coupling supports to the inside flank of a disk wheel (10) and the hub-side coupling half (11b) to the hub.
摘要:
The invention relates to a process for improved control of the driving and/or braking force on the wheels of a vehicle, especially the driving wheels of total-adhesion railway traction vehicles, in order to achieve optimal adhesion, where the wheels are run within a narrow range of oscillation about the maximum of the adhesion-slip characteristic curve of the wheel-rail contact, either by continually increasing and then reducing the driving/braking force or by increasing and reducing the acceleration for a set rotational speed. To improve wheel-rail contact through concertedly higher wheel-slip by adapting processes with which each wheelset can be run at the limit of adhesion with minimum slip without using the measured value of speed over ground, the invention proposes that in each case only some of the vehicle's wheels/wheelsets are regulated to produce optimal maximum adhesion, while the others are subject to a desired wheel-slip control, wherein the measured wheel speed/rotational speed on the wheels/wheelsets at optimal adhesion serve as reference speed to which the wheel speed/rotational speed of the other wheels/wheelsets is ajusted after a desired slip rate has been added. Thus a continual, for example cyclical, alternation of wheelsets can be done with increased and little slip.
摘要:
Es wird ein Verfahren zur zeitdiskreten Regelung des Stroms eines über einen Wechselrichter gespeisten Asynchronmotors in läuferflußbezogenen Komponenten mit einer taktweisen Sollwertvorgabe des Stroms, einer im gleichen Zeittakt abtastenden Istwerterfassung des Stroms und Istwertaufbereitung und einer durch die Regelung im gleichen Zeittakt bereitgestellten Stellgröße für den Wechselrichter angegeben. Bei diesem Verfahren sind die einzustellenden Parameter auf ein Minimum reduziert. Diese charakterisieren darüber hinaus unmittelbar das Verhalten des geschlossenen Regelkreises und sind von aktuellen Motorparametern unabhängig. Durch das Verfahren wird die Anpassung an die aktuellen Motorparameter automatisch vorgenommen.