Function Description: external control board, several kinds of control board for choice. Connect AC input directly, AC is turned to high voltage DC after full bridge rectified and then drives the DC brushless motor. High speed rotation up to 200,000RPM （it depends on the size of propeller, normally RPM range for a vacuum cleaner is 20000~50000RPM）. No Hall working mode gets such advantages as fast starting up, stable rotation and high efficiency (3%~5% higher than that of with Hall mode).

 Protective functions: over current protection, overheat protection (for control board and motor); blocking protection, lacking phase protection, starting up protection etc. The controller not only can be used on vacuum cleaner generally but also can be used on suction feeder, industry fans etc. We can adjust software according to different application to meet different application.