Haze, a new weather state, is an inevitable environmental problems of this century. People try their best to improve the air quality, so the air puirfier was developed. Most desktop air purifiers have beautiful appearance, they looks small & cute, and is easy to carry. "Small" is its advantages, but also its difficulty, "small" means that the interior space is limited, for the size of all components demanding. In order to meet this requirement, the Hengdrive specially developed  two brushless motors:B3020S and B2418M, the dimensions are  30 * 20mm and 24 * 18mm, which can keep the slim of desktop purifiers.

    As the name implies, the desktop air purifier is mostly used on the office desk. It is too close to peoples,so quiet and safe must be met. Hengdrive brushless dc motor B3020S and B2418M, specially with built in DC5V drive controllers, can be powered with USB plugd directly. Brushless motor use electronically commutated technology, its electromagnetic interference is too small that you can ingnore, so it will not impact on the computer and human body; the noise is 30db, so the purifire also can be used in the bedroom.