| 摘要 |
PURPOSE:To make it impossible to transmit the uncomfortable vibrations to an elevator cage by making the primary current frequency still lower than the critical frequency not generating the regenerative power after changing over the braking side from the powering side. CONSTITUTION:A torque dispatching signal T from a control compensator 2 and a real speed signal omegar from a speed generator 14 are inputted to a braking side current instruction generator 16. The braking side current instruction generator 16 sets the value of the slip frequency not resonating with the machinery system by making the frequency after changing over the braking side still lower than the same frequency that the regenerative power is just consumed at a motor interior. According to the constitution, the vibrations in a cage are effectively controlled. |
