大惯量负载特点之一就是启动转矩很大，稳定运行后的功率消耗又很小。这便使得工程设计中选择电机处在两难境地。按实耗功率选择电机，其负载启动不起来；若选择大容量电机，但电机启动达到稳定运行后，又处于轻载状态，造成电机资源上的浪费。 为解决这个问题，很多改进措施和 One of the characteristics of the large inertia load is that the starting torque is very large, and the power consumption after the steady operation is very small. This makes the design of electrical engineering in a dilemma. According to the actual consumption of power to select the motor, the load does not start up; if the choice of high-capacity motor, but the motor starts to achieve stable operation, but also in a light load condition, resulting in a waste of resources on the motor. To solve this problem, a lot of improvement measures and