Jen
Jul 18Firstly, most motors are rotating because in daily life, household motors and most industrial motors are rotating, and some linear motion can also be achieved through gear transmission. Linear motors, although claimed to improve efficiency through direct drive in many industrial settings, have limited practical applications in my personal opinion. The linear motors used in some maglev trains are more familiar to the general public and easier to understand. The principle of motors is electromagnetic induction. Simply put, a charged conductor is subjected to the force of a magnetic field, and the change in the electric field of the charged conductor also generates a magnetic field. It can also be understood as the effect of the magnetic fields on both sides of the stator and rotor, and this effect occurs through the air gap. The difference is that the magnetic field of a rotating motor is distributed along the circumferential direction (for traditional radial magnetic field motors, axial magnetic flux or complex ones are not mentioned), while the magnetic field of a linear motor is distributed along a straight line, which leads to the biggest difference, which is the motion trajectory.