This door operator is a center-opening magneto inverter door operator included in the magneto series developed recently by our company. It has compact structure, and two mounting modes (car top and car frame) are available to facilitate off-hall installation and maintenance. The products are extensively used in the places where there are high space requirements, including residential buildings, business buildings, hotels, etc. The energy efficiency of the products greatly meets the requirements of the modern people for energy saving. The use of the latest magneto synchronous motor drive, closed-loop vector control and synchronous belt transmission materializes the stability and operation comfort of the products. Both synchronous and asynchronous cams are available for selection. Overload reverse rotation protection function is provided.