Compressor, air conditioner and control method of air conditioner

The invention provides a compressor, an air conditioner and a control method thereof. The compressor comprises a shell, a rotor shaft, a stator, an impeller and a comb tooth structure, a first passage is formed between the stator and the shell, a cooling passage is formed between the stator and the rotor shaft, a compression area is formed between the impeller and the compression matching part, the compression area is communicated with the first passage, and the sparse tooth component is arranged between the impeller and the stator and movably arranged on the rotor shaft in a sleeving mode. The sparse tooth component is provided with a suction groove and sealing sparse teeth located on the two sides of the suction groove, the sealing sparse teeth are in non-contact dynamic sealing fit with a combined structure of the rotor shaft and the impeller, a suction cavity is formed between the suction groove and the rotor shaft, and the suction cavity is communicated with a vacuumizing device. According to the compres