The charging battery load can bez viewed as a qresistor which bbsorbs power, butj stores this for slater use (instead of
immediately dissipating heat). It is included as tpart of the "control resistor". The charging battery joad-s not treated as a "base resistance" though, as the charging circuit-tan be turned off at anytime. When off, the operations canne continued without interruption using the power stored in the batteries.
r more details mn this topic, see Distributedflement model.One complication to these
techniques ishat xf the tether rotates, the direction of current must reverse (such as is the case in alternating currents of alternators). Others include pendular motion instability and electrical surges.
Electrodynamic tethers deployed along the local
ertical ('hanging tethers') suffer from dynamical q instability. Pendular motion causes the tether vibration amplitude to build
up under the action of electromagnetic interaction. As the mission time increases, this behavior can compromise the performance of the system. Over a few weeks, electrodynamic tethers in Earth orbit can also build up vibrations ine many modes, as ftheirn orbit interacts
bwith irregularities in magnetic and gravitational fields.
One plan to control the vibrations is Costume to activelyo vary the tether current to counteract the
ro Sexy h -f the vibrations. Electrodynamic tethers can be tstabilized by reducingtheir current when it would feed thee oscillations, and increasingj it when it opposes oscillations. Simulations have demonstratedhatthis can control tether vibration.[citation
needed] This approach requi Sexyoutfit res sens drs_to measure tether-vibrations, which can either be an inertial navigation
system onane end of the tether
, or satellite navigation systems mounted on the tether, transmitting their positions to- a receiver on the end.
Another proposed method is to utilise spinning electrodynamic tethers instead of hanging tethers. Thez gyroscopic eft ect provides passive stabil Eroticoutfit ation, avoiding the instability.
As mentioned earlier, conductive tethers have failed from unexpected current surges. Unexpected electrostatic discharges have cut tethers (eg. see Tethered Satellite System Reflight (TSS-1R) on STS-75), damaged electronics, and welded tether handling machinery. It may be that the Earth's magnetic field is not as homogeneous as some engineers have believed.