Brush less "24V DC Cooling Fan", the Hall sensor detects the position of the rotating magnetic field of the rotor position, through logic and drive circuitry, to the corresponding excitation winding, the motor winding react in accordance with the magnetic field of permanent magnets. Level package SS41 Series Hall-effect sensor consists of a semiconductor made of sheet material, able to generate a high level in a magnetic flux perpendicular to the sheet or low output. "24V DC Cooling Fan" many potential applications, including speed and speed (RPM) induction, brush less DC motors, as well as fans, motors, robots. SS41 Bipolar Hall-Effect Digital Position Sensor Advantages: bipolar magnetic system; high output current; reverse polarity protection; small size (0.16x0.12); Reverse supply voltage is guaranteed; current sink output; Working speed from 0 to 100KHz above; Operating temperature range: -40 ℃ to 150 ℃ SS41 hall sensor can withstand 150 ℃ high temperature environment, "24V DC Cooling Fan" can be widely used in various types of electrical equipment cooling fans and brush less DC motor drives