The invention belongs to the technical field of motors, and discloses a total-closed high-speed
permanent magnet motor using
liquid jet to be cooled. The
permanent magnet motor comprises a motor shell, a
stator, a rotor and end covers, wherein the
stator and the rotor are arranged in the motor shell, the end covers are arranged at the
front and back ends of the motor shell, the end covers at the
front and back ends of the motor shell are both provided with wind gap shells, the wind gap shells at the
front and back ends are respectively provided with a
pipeline air inlet and a
pipeline air outlet, the end covers at the front and back ends of the motor shell are correspondingly provided with an air passage inlet and an air passage outlet, the
pipeline air outlet is communicated with the pipeline air inlet to form the circulation flow of gas in the motor, in addition, the side face of the front end of the motor shell is provided with multiple
liquid jet ports distributed around the external circumference of the motor shell, the
liquid jet ports are used for cooling the entered gas from the air passage inlet, and the cooling liquid ejected from the liquid jet ports is
Freon, R123, R245or R141. According to the total-closed high-speed
permanent magnet motor using liquid jet to be cooled, the temperature of the motor is effectively reduced, and the problems that the total-closed high-speed permanent
magnet motor has high temperature, difficult heat dissipation and too-high local temperature rising of the
stator and rotor are solved.