| 摘要 |
<p>A cage speed correction signal (Vcref2) is calculated by cage speed feedback control circuits (1, 13) so that a detected cage speed value (Vcfb) from a cage speed detecting circuit (6) follows up a cage speed instruction value (Vcref) given from the outside, and the signal (Vcref2) from the cage speed feedback control circuits is then converted into a speed instruction signal (Vmref) for a motor for an elevator by a speed conversion circuit (2), the elevator driving motor being controlled by a motor speed control circuit (3) on the basis of the motor speed instruction signal from the speed conversion circuit. In the feedback controlling of an elevator speed based on this cage speed, feedback control gains (Kd, Tc) necessary for minimizing the resonance of an elevator machine system are calculated by a gain computation circuit (7) correspondingly to a combination of a detected cage load value (mc) from a cage load detecting circuit (9) and a detected cage position value (y) from a cage position detecting circuit (10), whereby the gain setting for the cage speed feedback control circuits (1, 13) is done. Thus, the vibration, which occurs when the cage speed reaches a certain special level due to a resonance frequency of the elevator machine system (4) depending upon the cage load and cage position, is minimized so as to improve the riding comfort.</p> |
