Electric motor positioning device, electric motor, and gimbal

An electric motor, comprising:

• a stator;
• a rotor rotatably mounted on the stator;
• a controller;
• and
• an electric motor positioning device, comprising:
• a photoelectric sensor electrically connected to the controller, the controller being configured to obtain an electrical signal of the photoelectric sensor;
• and
• a positioning ring including a first area and a second area, wherein:
• one of the photoelectric sensor and the positioning ring is fixed on the rotor and rotates with the rotor, and the other one of the photoelectric sensor and the positioning ring is fixed on the stator;
• and
• a position of the photoelectric sensor relative to the positioning ring rotates within a predetermined range with a relative rotation between the rotor and the stator, the predetermined range including a boundary between a first area and a second area.

A gimbal, comprising:

• at least one gimbal shaft, comprising:
• an electric motor configured to drive the gimbal shaft to rotate, the electric motor comprising:
• a stator;
• a rotor rotatably mounted on the stator;
• a controller;
• and
• an electric motor positioning device, comprising:
• a photoelectric sensor electrically connected to the controller, the controller being configured to obtain an electrical signal from the photoelectric sensor;
• and
• a positioning ring including a first area and a second area, wherein:
• one of the photoelectric sensor and the positioning ring is fixed on the rotor and rotates with the rotor, and the other one of the photoelectric sensor and the positioning ring is fixed on the stator;
• and
• a position of the photoelectric sensor relative to the positioning ring rotates within a predetermined range with a relative rotation between the rotor and the stator, the predetermined range including a boundary between a first area and a second area.