The invention discloses a method for controlling the electromagnetic attractive force suspension without adopting a gas gap sensor on the basis of an additional alternating
voltage. The alternating
voltage with certain features is doped in a closed-
loop control voltage of a suspension
electromagnet coil; the obtained voltage is applied to the suspension
electromagnet coil; a current of a component with the same features is obtained in the coil; according to the input and doped feature alternating voltage and the current component with the same features in the current of the coil, the
inductance of the suspension
electromagnet coil is identified; a suspension electromagnet gas gap is obtained by the
inductance; and the gas gap value is used for carrying out closed-
loop control. Due to no adoption of the gas gap sensor, a
system can be greatly simplified and the real suspension gas gap can be reflected by the
inductance obtained by the additional coil. Due to the adoption of the method,the requirement on the rail accuracy of a
maglev vehicle
system can be lowered, the control
instability of the
system cannot be caused by inaccurate measurement of the gas gap sensor, and the problems of rail gap passing, cogging and the like of a
maglev vehicle can be well solved. The method for controlling the electromagnetic attractive force suspension without adopting the gas gap sensor on the basis of the additional alternating voltage has the advantages of high reliability, low cost, safety and the like.