The working principle of the hollow cup motor is based on the law of electromagnetic induction and the Lorentz force law. When an external current is applied to the stator, the stator creates a rotating magnetic field, which interacts with a coil (or magnet) on the rotor to drive the rotor to spin. Since the rotor is hollow in the middle, this design not only reduces the weight of the motor, but also provides space for devices such as sensors to be installed inside it, making the control of the motor more flexible and precise.