| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric blower which achieves the cooling of the bearing of a brushless motor with a compact and low-loss structure when operating at a high-speed revolution and has high air-sending performance and high reliability and further to provide a vacuum cleaner using the same. <P>SOLUTION: The electric blower includes: a brushless motor 7 made up of a rotor 3 with a rotary shaft 2a, a stator 4 oppositely arranged on the periphery of the rotor 3, and a motor frame 6 for holding the bearing 5 of the rotary shaft 2a and covering the stator 4; an impeller 8 fixed to the rotating shaft 2a; an air guide 9 for forming an airflow path on the periphery of the impeller 8; and a fan case 10 fixed to a foreface of the air guide 9 to cover the impeller 8. The rotary shaft 2a is formed with a double structure including a heat dissipating shaft 11a and a spindle 12a to transfer heat generated in the bearing 5 to the heat dissipating shaft 11a of the rotary shaft 2a, enabling the heat to be continuously dissipated to an air current inflowing from the impeller 8. Therefore, the bearing 5 is efficiently cooled even at the high-speed revolution to prevent a seizure by curbing an excessive temperature rise, thus permitting the electric blower with a compact and high air-sending performance to be achieved. <P>COPYRIGHT: (C)2013,JPO&INPIT |
