Motor: Aolan uses a new generation of permanent magnet synchronous external rotor motor, combined with oil -cooled technology. Energy -saving Small volume and light quality; Low noise; Simple structure; FM width (0 ~ 50Hz); Drive motor free maintenance; No hidden dangers; Quickly heat dissipation; long life; No wear. 1) Fan blades and tails: remain unchanged. 2) The fixed rack of the fan blades: Make a safe upgrade to achieve dual insurance (the 1st generation fixed frame is independent, and the 2nd generation is the overall type). 3) Anti -fracture shaft connection: The first generation of the films have multiple design bands, poor safety, the second -generation connector is designed with a flat tablet, without bending, high safety. 4) Link cover: 2nd generations increase the sheet metal cover, which is relatively beautiful. At the visual level, the hanging fan forms the whole and enhances the sense of security. 5) The fixing method of steel wire rope: Originally fixed at the lower end of the connection sheet, it is now fixed to the upper end, the overall is more beautiful. 6) Alarm (non -standard): remain unchanged. When an HVLS fan fails, the motor will automatically decelerate and trigger the alarm switch. The alarm lights are flickering and whistle, reminding the personnel to stay away, avoiding the occurrence of accidents, and greatly enhancing the customer's sense of security.