VACUUM TUBE HAVING EXPOSURED ANODE

摘要

The present invention relates to a vacuum tube having an anode exposed to the air to control a motor having combined advantages of a direct current (DC) motor with a brush and a brushless DC (BLDC) motor, comprising: a cathode; an anode surrounding the cathode; and a sealing member insulating between the cathode and the anode and sealing a space between the cathode and the anode with an insulator to maintain the space to be vacuumed, and providing a configuration in which a surface of the anode is exposed to the air, thereby minimizing a vacuum tube.