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 movingcoil permanentmagnet planar motor, this paper analyzes the maglev up and down moving process under the control of realtime current distribution strategy, proposes the concept of “false airgap point”, deduces the mathematical equation between the position of "false airgap point" and the desired airgap position and the time calculation integral formula that when mover moves up to desired airgap position and descends to zero altitude.The “false airgap point” has two reflections. One is that when the mover stays at the zero position, the coil is assigned a "false airgap point" constant current and the speed of the mover running to the desired airgap point is zero on the condition of the current drive. The other is that when the mover floats at the desired airgap position, the coil is distributed “false airgap 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 airgap 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.