Variable frequency range hood adjusts the motor speed through a variable frequency drive circuit. The core is to replace traditional tap speed or relay speed regulation with a variable frequency module composed of IGBT+drive chip, achieving smooth and efficient adjustment of motor speed while balancing high suction and low noise. 

The matched motor is a brushless DC motor (BLDC) or a permanent magnet synchronous motor (PMSM), which has the advantages of high efficiency, low noise, and long service life compared to traditional series excited motors. Brushless DC motors detect rotor position through Hall sensors and achieve electronic commutation with variable frequency drive, eliminating the need for carbon brushes and reducing failure rates