无环流可逆调速系统中,两组整流装置不能立即进行切换,必须在转矩换向信号和零电流检测信号的指令发出后,还需经过“关断延时”τ_1才关断原导通组的脉冲,再经过“导通延时”τ_2再发送另一组的触发脉冲,因此存在电动机切换死区。另外,在切换制动过程和启动过程中,由于存在一定的调节时间τ_3,从而使切换死区加大至τ=τ_1+τ_2+τ_3(大于10ms)。为了改善切换调节特性,缩小切换死区τ,只有以减少调节时间τ_3来实现。这里通过对电机最优过渡过程曲线分析来说明τ_3的组成及改善途径。 Acyclic flow reversible speed control system, the two sets of rectifier can not immediately switch, must be in the torque commutation signal and zero current detection signal instruction issued, but also through the “off delay” τ_1 before turning off the original Turn on the group of pulses, and then through the “on delay” "τ_2 and then send another set of trigger pulse, so there is a motor switching dead zone. In addition, the switching dead zone increases to τ = τ_1 + τ_2 + τ_3 (more than 10ms) due to the existence of a certain regulation time ττ during the switching of the braking process and the starting process. In order to improve the switching regulation characteristic, reduce the switching dead zone τ, only to reduce the adjustment time τ_3 to achieve. Here through the curve of the optimal motor transition curve to illustrate the composition of τ_3 and ways to improve.