Rotating the magnet, the magnetic field can rotate 360° around the axis of rotation, can be equipped with a stepping motor to accurately control the rotation of the magnet, set the rotation angle arbitrarily, and programmatically control the forward and reverse rotation and travel time. The angle resolution accuracy of the controller is 0.01 degrees, the mechanical step angle accuracy is 0.1 degrees, and the repeat positioning accuracy is 0.05 degrees.