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Volume 54 Issue 1
Feb.  2019
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Article Contents
Journal of Southwest Jiaotong University  > 2019  >  54(1): 1-8, 22.
JIANG Qilong, LIANG Da, YAN Feng. Application of Digital One-Cycle Control for Current in Electromagnetic Suspension System[J]. Journal of Southwest Jiaotong University, 2019, 54(1): 1-8, 22. doi: 10.3969/j.issn.0258-2724.20170771
Citation: JIANG Qilong, LIANG Da, YAN Feng. Application of Digital One-Cycle Control for Current in Electromagnetic Suspension System[J]. Journal of Southwest Jiaotong University, 2019, 54(1): 1-8, 22. doi: 10.3969/j.issn.0258-2724.20170771
shu

Application of Digital One-Cycle Control for Current in Electromagnetic Suspension System

doi: 10.3969/j.issn.0258-2724.20170771
  • Received Date: 03 Nov 2017
  • Rev Recd Date: 16 May 2018
    • Available Online: 30 May 2018
  • Publish Date: 01 Feb 2019
    Abstract
  • In an electromagnetic suspension system （EMS） with cascade control, the response speed and accuracy of the current loop play a vital role in the overall suspension control. A current controller was designed for digital one-cycle control （D-OCC） based on TMS320F28335 for the suspension system, in order to improve the response speed of the current loop and reduce the following error. Taking a chopper circuit as the research object, the D-OCC’s mathematical model was established and the control algorithm of rated suspension point was derived in detail. The algorithm was validated through Simulink, and the current loop controlled by D-OCC was incorporated into the actual EMS. Experimental results show that the conventional PID control has a certain overshoot at the wave’s rising and falling edges when a square wave signal with frequency of 5 Hz and amplitude of 3 A is followed. Moreover, there is a following error of not less than 20 mA after the stabilization. However, there is no overshoot in the adjustment process and no following error after stabilization, when following the same wave with the method of D-OCC. This means that the D-OCC algorithm can follow the instruction current quickly and accurately. The floating process of the suspension system using the D-OCC current loop requires an adjustment time of about 0.4 s, and the system can overcome the 50% load disturbance and the 1.5 mm air gap disturbance; this shows that the method can achieve the system stable levitation and has strong robust performance.

     

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