Research on Hybrid Method of Belt Conveyor’s Soft Start under Heavy Load

Heavy-load start of belt conveyor usually brings tremendous strike to electric power network, belt conveyor itself and correlative mechanical equipments. This paper introduces a technique of soft start of belt conveyor under heavy load, which could extend the lifetime of belt conveyor and associated mechanical equipments, and reduce equipment failure rate. After discussion over common ways to achieve heavy-load soft start, this paper presents a hybrid method of soft start mixed AC-AC frequency conversion with voltage regulating to control speed. Several implementation principles of this hybrid way are deeply discussed , and a mathematical model is constructed . The simulation result shows that this hybrid way ensures asynchronous motor to offer an effective moment on starting, which is advantageous over traditional ways. The result also validates its feasibility.