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The position and speed detection of maglev train is critical to train control system. The common methods of speed measurement include speed sensor measurement and speed sensorless measurement. The use of sensorless method can significantly reduce costs and it's not influenced by various environmental factors. In this paper, a high frequency pulsating voltage injection method is proposed for the PMLSM,...
The grating type velocity measuring method shows great promise in getting the velocity of high power and large thrust linear motors. In this paper, the analytical model of velocity measuring sensor is deduced, and verified through experiment. The analytical model of electromagnetic field produced by “8”word rectangular planar spiral coils is obtained from the second order vector potential formulation...
To solve the velocity-measurement difficult problem of linear motor in high speed and high acceleration occasions, a velocity-measurement method based on teeth-slots signals detection is proposed in this paper. In this method, the speed signal is obtained from the inductance periodic variation of probe coil, and the "teeth-slots" bar consisting of conductor and ferromagnetic materials alternating...
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