Magnetic steel produced by the magnetic field lines, through air gap into the stator tooth and coil chain, forming the air gap flux and flux. Magnetic steel, shape, the performance of the stator shape and material performance directly affects the size of the motor air gap magnetic flux, consider the seven times brushless motor magnetic flux density and magnetic flux than simply considering magnetic flux and magnetic flux density of factors to relatively more, once the brushless motor magnets and the stator laminations after, they form the magnetic circuit of the motor, air gap magnetic flux is formed, it is the no-load air gap magnetic flux of the machine, the stator's magnetic flux density and no-load tooth magnetic flux density
