Brushless direct current motor for insulating medium internal circulating pump

The invention discloses a brushless direct current motor for an insulating medium internal circulation pump, which comprises a casing, a pump body arranged at the left end of the casing, an end cover and a driver arranged at the right end of the casing, a stator armature arranged on the inner wall of the casing, a main shaft rotatably arranged between the left end of the casing and the end cover, and an impeller coaxially arranged at the left end of the main shaft and extending into the pump body, rotor magnetic steel located in the stator armature is arranged on the outer circle of the main shaft, the right end of the stator armature is connected with the driver through a leading-out wire, a center flow channel is formed in the main shaft in the axial direction, and a circulating type cooling liquid flow channel structure is formed between the annular air gap and the center flow channel. According to the invention, the principle is scientific, the structure is compact, the insulating medium in the pump body