The permanent magnet variable frequency large ceiling fan is a new product specially developed to improve the comfort of working environments. It is driven by a self-designed variable frequency speed regulation, high-efficiency and energy-saving permanent magnet outer rotor motor. It features low noise, compact size, light weight, compact structure and attractive appearance. It is widely used in tall and large spaces such as industrial workshops, logistics warehouses, waiting rooms, exhibition halls, gymnasiums, supermarkets and shopping malls, as a new type of ceiling fan for space ventilation and human body cooling. It can push a large amount of airflow to the ground to form a moving airflow layer of a certain height, thus promoting overall air circulation. Its system is similar to the natural breeze, bringing users a gentle experience of natural wind. With a blade diameter ranging from 3m to 7.3m, the fan adopts aerodynamic wing-shaped fan blades manufactured with advanced technology. Its powerful air stirring capability creates a circulating airflow field, forming a breeze system just like nature. The human body can feel three-dimensional wind from all directions, greatly improving comfort. The effective coverage area of a single fan can reach up to 1700m². The product adopts a liquid-cooled direct-drive motor system. As the first in the industry, its motor uses oil cooling technology and has obtained a utility model patent certificate. It integrates liquid cooling heat dissipation and intelligent thermal protection. The Class H enameled wire withstands high temperatures up to 180°C, significantly improving motor efficiency and ensuring stable operation and ultra-long service life. The laser-cut integrated blade bracket prevents any components from loosening or falling off and reduces mechanical failure points. The ceiling fan is equipped with anti-shaft break protection to avoid accidental falling of the whole unit. The aviation-grade high-strength aluminum-magnesium alloy blades feature an internal reinforcement structure for guaranteed safety. The blades and blade holders adopt an internal-insertion and external-clamping structure, increasing the contact area for maximum safety. The tapping process applied to the blade bracket provides multiple protections against bolt loosening — an industry first.