Sensorless control strategy on stable maglev moving up and down of movingcoil permanentmagnet planar motor
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College of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China

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TP13

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    Abstract:

    Aiming at the problem of excessive deviation and jitter in the process of floating and impacting stator surface in the process of descend in the sensorless control on movingcoil permanentmagnet planar motor, this paper analyzes the maglev up and down moving process under the control of realtime current distribution strategy, proposes the concept of “false airgap point”, deduces the mathematical equation between the position of "false airgap point" and the desired airgap position and the time calculation integral formula that when mover moves up to desired airgap position and descends to zero altitude.The “false airgap point” has two reflections. One is that when the mover stays at the zero position, the coil is assigned a "false airgap point" constant current and the speed of the mover running to the desired airgap point is zero on the condition of the current drive. The other is that when the mover floats at the desired airgap position, the coil is distributed “false airgap point” constant current and the speed of mover running to zero position is zero as the result of the current drive. The control strategy utilizes the phenomena mentioned above, and moves the mover smoothly between the zero position and the airgap point by switching the current. The simulation result shows that the mover running deviation and the jitter are very small, which proves the validity of control strategy.

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  • Received:
  • Revised:
  • Adopted:
  • Online: November 06,2017
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