In permanent magnetless gear motors, the rotor rotates at a speed equal to the rotating magnetic field produced by the stator. This synchronicity is the result of the design of a motor consisting of permanent off-center magnets in the rotor; Therefore, there is no need to change the magnetic flux passing through the rotor conductors to create an opposing magnetic field that follows the rotation of the stator rotating field; Because the rotor is magnetic in itself and therefore does not need to slip. The magnets (rotors) of the magnets follow the rotating magnetic field of the stator. If you are well acquainted with the concept of what is a gearless motor, you can know the synchronous motor.