in the process of handling goods, we need to carry out frequency conversion and speed change process. the speed control process can be divided into throttle speed change and volume speed change. throttling speed change will change the cross-section size of flow control elements in the control circuit, which can effectively control the flow of components, and then more effectively adjust the running speed of electric forklift. because the adjustment of movement speed is mainly completed by the transition of flow section, the energy consumption will be damaged to a certain extent.
the volume change of electric forklift will change the displacement of variable piston pump in the control circuit, so that the components can be adjusted. on the one hand, the speed ratio of electric forklift motor is changed, and the output flow of hydraulic pump can be further changed. in addition, variable organization can be used to change the displacement of the hydraulic pump, so that the output flow of the hydraulic pump can be changed.
the pump source of electric forklift is completed by pressure feedback variable displacement piston pump. when the motor speed is controlled, the volume speed change can be further completed by frequency conversion. with the continuous change of load operation, it will gradually change into the working pressure of electric forklift, and further improve the work efficiency. according to the relevant research data, the working pressure and feedback pressure of electric forklift are usually maintained in a balanced position.
with the continuous development of electric forklift ac motor control theory, ac variable frequency variable speed technology has been widely used in the whole electric forklift industry.