Rotate the magnet, the magnetic field can rotate 360 degrees around the rotating shaft, the stepping motor can be equipped to accurately control the rotation of the magnet, the rotation angle can be arbitrarily set, and the forward rotation and reverse rotation and travel time can be controlled programmatically. The angle resolution accuracy of the controller is 0.01 degree, the mechanical stepping angle accuracy is 0.1 degree, and the repeated positioning accuracy is 0.05 degree