1、重庆升降机的操作非常频繁，并具备较高的承载能力和速度，电动机的正方向切换、起动与制动都显得尤为频繁了，电动机始终处于负荷的状态下，因此就要求制动平稳。
Zhejiang freight operation under very frequently, and have a higher carrying capacity and speed, the positive direction of the motor switch, starting and braking are particularly frequent, the motor is always in the load state, and therefore requires smooth braking.

2、升降机电动机的工作状态是可逆的，运行机构基本属于阻性负载，主要承受摩擦阻力矩，电动机的工作状态基本是电动状态。属于位能负载，主要承受位能负荷，要求电动机具有不对称性工作状态，提升或轻钩下降时为电动状态，重载下降时为制动。大型化、自动化和高性能化要求其传动具有调速范围宽、调速性能优良，以达到准确定位、改善劳动强度、保证安全、提高生产率。
Zhejiang freight motor operating state is reversible, operating agencies are basically resistive load, mainly bear friction torque, the motor is an electric state basic working conditions. Zhejiang Lifts belong potential energy load,mainly bear potential energy load, the motor asymmetry working conditions, promotion or light drops electric hook state, down to brake when overloaded. Zhejiang large freight elevators, automation and high performance required to drive with a wide speed range, excellent speed performance, in order to achieve accurate positioning, improve labor intensity, ensure safety and improve productivity.

3、货梯工作任务繁重，要承受瞬时过载、冲击和振动，因此要具有足够的过载能力，要求电气传动系统的可靠性高、保护装置完善、操作及维修方便，满足装卸要求。
Zhejiang Lifts heavy workload, to withstand transient overload, shock and vibration, and therefore have sufficient overload, Zhejiang Lifts demanding electrical transmission system reliability, perfect protection device, easy operation and maintenance, to meet the loading requirements.