近来,由市场反馈的信息得知,蓄电池叉车在使用中直流串励调速系统经常出现起升接触器触点烧坏、频频更换起升接触器的现象,给用户的使用带来了很大麻烦。分析原因如下:门架是叉车的工作装置,由起升电机控制,而起升电机受斩波器中的起升接触器控制。在叉车堆垛过程中,货物的起升、前倾、后倾、侧移都由起升电机控制,这些操作过程皆时间短、频 Recently, the feedback from the market that the battery forklift DC in-line speed control system often appear in the use of contactor contact lifting burned, frequent replacement of the rising contactor, the use of the user has brought a lot trouble. The reasons for the analysis are as follows: The gantry is the working device of the forklift truck and is controlled by the hoisting motor, while the hoisting motor is controlled by the hoisting contactor in the chopper. In the forklift stack process, the goods lifting, forward, backward, side shift by the lifting motor control, these operations are short time, frequency