Automatic cleaning device

An automatic cleaning device, comprising:

• a mobile platform, a position determination device, and an assembly structure configured to assemble the position determination device on the mobile platform, wherein:
• the assembly structure comprises an assembly bracket comprising:
• a rotor accommodation portion comprising a first arc-shaped side wall;
• and a motor accommodation portion comprising a second arc-shaped side wall, wherein the first arc-shaped side wall of the rotor accommodation portion is in smooth connection with the second arc-shaped side wall of the motor accommodation portion;
• and an area of an opening formed by the first arc-shaped side wall is greater than an area of an opening formed by the second arc-shaped side wall;
• and
• the position determination device comprises a position determination element comprising:
• a rotor, wherein a rotating shaft of the rotor is substantially disposed in a geometric center of the rotor accommodation portion, and is configured to transmit and/or receive a detection signal during continuous rotation;
• and a motor,
• wherein an output shaft of the motor is substantially disposed on a connecting line between a geometric center of the motor accommodation portion and the geometric center of the rotor accommodation portion and located between the geometric center of the motor accommodation portion and the geometric center of the rotor accommodation portion, and the motor is configured to connect to the rotor through a power transmission structure to provide a driving force for the rotor.