Automatic cleaning apparatus

An automatic cleaning apparatus, comprising a mobile platform, a position determining device and an assembling structure for assembling the position determining device on the mobile platform, wherein:

• the position determining device comprises a position determining element and a cover;
• the position determining element comprises a rotor and a motor, wherein the rotor is configured to perform at least one of transmitting or receiving a detection signal while continuously rotating, and the motor is configured to be connected to the rotor by means of a power transmission structure to provide a driving force for the rotor;
• the cover covers a top of the rotor and comprises a circular top surface, a bottom ring and a plurality of connectors connecting the circular top surface to the bottom ring, wherein a first gap is formed between the bottom ring and an outer peripheral surface of the rotor;
• and
• the assembling structure comprises an annular shielding member attached to an inner side of the bottom ring, a second gap is formed between the annular shielding member and the outer peripheral surface of the rotor, and the second gap is smaller than the first gap.