Three-phase straight

Three-phase straight? Brushless motor basic drive method, divided into rectangular wave drive and are XuanBo drive. The former will 6 switch with simple ON/OFF - signal drive motor runs, the driving mode of the latter as the general due? The motor, the stator end input three-phase sine wave signal, synthesis of a rotating magnetic field to drive the rotor rotation, the workings of the motor as permanent magnet due? Synchronous motor, because of this? Using the rectangular wave drive motor runs, so the sine wave driving mode? In the single phase motor description. Rectangular wave driven approach is divided into 2 kinds, 120 ° square wave drive with 180 ° square wave drive, as shown in figure 2.4. 

By conducting 6 switch control current? , can be in 6 of the direction of the magnetic field is generated in the motor as shown in figure 2.5, attract the rotor reach 6 point, through the change of the switching sequence, can make the motor rotation. In the actual application, because 180 ° square wave drive every time conduction switch from 120 ° square wave wholesalemotor.blogspot.com drive one more, its work? The loss is bigger. And configuration on the motor of the hall element (its USES in the next section? Ming), usually applies to 120 ° square wave drive, so? Is to use 180 ° square wave drive, the hall element output signals must be fan cover offset Angle of 30 ° electrical appliances, office? More trouble, so in the actual use mostly driven by 120 ° rectangular wave. In this? Article 120 ° motor drive mode was adopted in the rectangular wave driven.