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提升机除以正常速度升降人员、物料外,有时还需要低速运行,如检查钢丝绳、井筒、罐道等,都需将速度控制在0.3～0.6(米/秒)。目前在交流拖动的矿井提升机(如XKT型和JKM型)除采用微拖动装置或低频机组外,一般很难得到0.5(米/秒)左右的稳定低速。过去这类提升机都是采用电动变阻调速,即在转子回路加入预备级电阻来降低速度。由于负载特性与电机人工机械特性所决定的工作点不一定符合低速要求,同时不平衡提升系统本身的静张力差也随着提
Lifting machine divided by the normal speed of lift personnel, materials, and sometimes also need low-speed operation, such as checking the wire rope, wellbore, cannon, etc., are required to control the speed 0.3 ~ 0.6 (m / s). At present, mine hoists (such as XKT type and JKM type) driven by AC drag are generally difficult to obtain a steady low speed of about 0.5 (m / s) except for the use of a micro-traction device or a low-frequency unit. In the past this type of hoisting machine is the use of electric resistance variable speed, that is, in the rotor circuit by adding a preliminary level of resistance to reduce speed. Due to the characteristics of the load and the mechanical properties of the motor determined by the work point does not necessarily meet the requirements of low speed, unbalanced lifting system itself static tension difference also with mention