"DC Fan" magnetic stripe affect fan performance mainly in the following aspects: (1), magnetic stripe magnetizing strength is not enough; in particular the application of a small fan, because IC is far from the magnetic stripe, the magnetic stripe of a magnetic field sensing IC weak, the magnetic field strength is reflected in the characteristic curves are smooth, the longer the switching time of the IC, thus being liable to adversely induction ﹑ dead center problems. (2), magnetizing the magnetic stripe uneven or poor symmetry, IC in N / S switch time will be different, it will also cause serious wave size, speed instability and other issues.