Center-opening VVVF synchronous door operator: Door opening width is 800-1200mm. The door operator adopts new efficient synchronous round teeth belt, so it has the figures of better engagement, simple transmission structure, stable rotation and low noise; The adoption of synchronous door vane makes the device be of the characteristics of simple structure, convenient adjustment, safety and reliability, etc. The motive curve is controlled by advanced photo-electric code disk and photo-electric switch and adjusted according to the position feedback that is detected by the switch. It has the figures of high precision control and good reliability, etc. It can be easily installed on car top.