suspension current

suspension current

[sə′spen·shən ‚kə·rənt]
(oceanography)
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As there is an inductance, the suspension current of different suspension points of suspension electromagnets have different perturbation and time lag to a certain extent.
Case 6: Assuming that the frequency of the suspension current is relatively faster, that is 500 Hz, the levitation current perturbation value of the suspension frame 1, 3 and 5 are 10%, 30% and 50%, respectively, and the levitation current of the remaining suspension frame are ideal conditions.
Case 7: Assuming that the frequency of the suspension current is relatively gentle, that is 100 Hz, the levitation current perturbation value of the suspension frame 1, 3 and 5 are still 10%, 30% and 50%, respectively, and the levitation current of the remaining suspension frame are still ideal conditions.
Case 8: Assuming that the frequency of the suspension current is relatively slower, that is 20 Hz, the levitation current perturbation value of the suspension frame 1, 3 and 5 are still 10%, 30% and 50%, respectively, and the levitation current of the remaining suspension frame are still ideal conditions.
When the range of suspension current perturbation are adopted, the case 6, case 7 and case 8, respectively, the dynamic response characteristics of the suspension gap of suspension frame 1, 3 and 5 are shown in Figures 11-13, respectively.
It only takes 1 s to get stable suspension, when suspension current perturbation frequency is 100 Hz.
To sum up, because the frequency of the current perturbation is related to the frequency of the suspension controller, as a result, when the suspension current perturbation is too large, such as about 50%, appropriately increasing the frequency of the suspension controller is conducive to suppress the coupling vibration of the track and improve the suspension stability of the maglev system.
The effects of inner loop current gain coefficient P, actuator delay and suspension current perturbation on static stability are studied, and it can be concluded as follow.
According to the air gap flux-linkage amplitude of the torque system, the controllable magnetic suspension force components in the static [alpha]-[beta] coordinate system can be controlled by the suspension current components [i.sub.s2m] and [i.sub.s2t]; the specific models can be expressed as follows [18]: