is capable of reducing a mechanical vibration generated from the cage by obtaining a torque of the winding machine from a speed controlled current command and an acceleration of the winding machine from the torque and the present acceleration of the winding machine to compensate for and output the value of the current command when a high speed elevator having a low mechanical resonant frequency is operated application_number US 74964296 A description referring to the accompanying drawings the speed control apparatus for compensating a vibration of an elevator according to the present invention will now be described in detail fig3 is a schematic diagram showing the construction of a speed control apparatus for compensating a vibration of an elevator according to the present invention as shown in this drawing the elevator includes a winding machine 118 having a motor and a sheave a cage 121 and a counterweight 122 for performing a vertical movement according to a rotation of the winding machine 118 through cables 119 120 the speed control apparatus includes a pulse generator 117 for outputting a pulse signal p1 in accordance with a rotation of the winding machine 118 a pulse amplifier 115 for receiving the pulse signal p1 to output a pulse signal p2 corresponding to a rotating speed of the winding machine 118 a first subtractor 112 for subtracting the.