HALTING METHOD AT PREDETERMINED POSITION OF LINEAR SYNCHRONOUS MOTOR

摘要

PURPOSE:To enhance the halting accuracy of a vehicle at the prescribed position by controlling a propulsion current by the phase difference between the synchronous sinusoidal wave synchronized with the travelling of the vehicle and the sinusoidal wave pattern generated from the travelling pattern predetermined in synchronism with an absolute position signal provided before the stopping point. CONSTITUTION:When an absolute position of a detector 11 provided before the stopping point of a vehicle is inputted to a travelling pattern 12, a sinusoidal wave pattern 16 of the constant peak value of the deceleration matched to the pattern 12 is generated in synchronism with the absolute position. A phase difference detector 19 outputs a phase difference delta between the synchronous sinusoidal wave S synchronized with the actual travel of the vehicle and the pattern 16. A propulsion current arithmetic unit 13 outputs a propulsion current (i) corresponding to the phase difference by considering the output from a load detector 20, multiplies the current (i) by the pattern 16 and outputs a current pattern 14.