Motor and blow device using the same

A motor comprising:

• an air guide member having a center frame and a plurality of air guide fins arranged at intervals on outer periphery of the center frame, each two adjacent air guide fins define a first air channel, a plurality of the first air channels form an air guide area;
• a stator assembly having a stator yoke and a plurality of stator teeth, the stator teeth are connected to inner wall of the stator yoke and are arranged at intervals along circumferential direction of the stator yoke, each two adjacent stator teeth define a second air channel, a plurality of the second air channels form a heat dissipation area;
• a housing having an receiving cavity extending through axial direction of the motor to receive the stator assembly and the air guide member;
• an air outlet member located at an end of the stator assembly away from the air guide member and connected to the housing, the air outlet member having an outlet area;
• a rotor rotatably arranged within the stator assembly, the rotor having a shaft, one end of the shaft is extended from the stator assembly and passed through the air guide member, another end of the shaft is extended from the stator assembly and passed through the air outlet member;
• a preload support assembly having a first preload unit and a second preload unit respectively located on both sides of the stator assembly, the first preload unit and the second preload unit are both connected to the shaft to form opposing forces;
• and
• an impeller arranged on the side of the air guide member away from the stator assembly and connected to the shaft, wherein the ratio of the maximum diameter of the inner wall of the stator yoke to the maximum outer diameter of the impeller is between 0.8-1.2;
• wherein the air guide area, the heat dissipation area and the outlet area together form an only air channel of the motor, air flow generated by the driven impeller is guided by the air guide area and completely passed through the heat dissipation area, and flowed out from the outlet area;
• wherein the first preload unit and the air outlet member are arranged on the same side of the stator assembly, the first preload unit includes an elastic member and a first bearing arranged on the shaft, one end of the elastic member is resisted on the air outlet member, another end of the elastic member is resisted on the first bearing;
• wherein the air outlet member comprises a center seat, shell and a plurality of support parts connected between the shell and the center seat, each two adjacent support parts define a outlet, the number of the stator teeth is 6, the number of air guide fins is between 6 and 12, and the number of support parts is between 2 and 6.