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In principle, the movement of three roller brake can be divided into mechanical type and electric type. The so-called mechanical type is passive rotation, which is driven by customers; The electric movement is driven by a motor to rotate. The electric movement has a high degree of automation, and the boost makes the rotating rod operate easily and stably, especially when it is powered on.

The mechanical movement relies on complex mechanical and electronic design to realize the stability of force and the automatic balance of rotating rod, with high reliability and convenient maintenance.

From the perspective of use, the thrust required by the three-bar machine is very small, so there is no need for electric power; The motor core adopts complex motor driving circuit and detection circuit, which has high requirements for the service life of the motor, is difficult to maintain, and is prone to failure in harsh humid and high temperature climate; The three bar gate used in domestic metro is basically mechanical.