Electric motor structure

An electric motor structure, comprising:

• at least two magnet sets disposed oppositely at a distance, where each magnet set comprises a magnet having poles arranged perpendicular to the magnet's movement, the magnets in a same magnet set are stacked and have poles of reversed polarities on a same side, and opposing magnets from neighboring magnet sets have facing poles of a same polarity;
• at least one coil assembly disposed between two neighbouring magnet sets, where the magnet sets and the at least one coil assembly conduct a relative movement, the at least one coil assembly is axially parallel to an alignment direction between the facing poles of opposing magnets, the at least one coil assembly comprises a magnetizer wrapped in a winding, and a front yoke and a back yoke respectively extended from two ends of the magnetizer towards opposite directions, the front yoke interacts first with a magnet in the relative movement, the back yoke interacts later with a magnet, a specific distance is between the front and back yokes' centers, and a front detection element and a back detection element are respectively provided on the front and back yokes;
• and
• a detection switch circuit disposed between the magnet sets and the at least one coil assembly, where the detection switch comprises at least a negative detector or at least a positive detector, and at least one break detector, each disposed at a pole on a magnet that interacts earlier with the front yoke of the at least one coil assembly in the relative movement, the negative detector is disposed at an N pole of a magnet having the N pole facing the at least one coil assembly, a the positive detector is disposed at an S pole of a magnet having the S pole facing the at least one coil assembly, the break detector is disposed at a pole on a magnet that interacts later with the back yoke of the at least one coil assembly in the relative movement;
• wherein, when the front detection element detects the negative detector or the positive detector, a positive or negative power supply is respectively applied to the at least one coil assembly;
• and, when the back detection element detects the break detector, the positive or negative power supply to the at least one coil assembly is cut off