BRUSHLESS MOTOR WITH DYNAMIC PRESSURE FLUID BEARING OF HEAT RADIATION TYPE

摘要

PROBLEM TO BE SOLVED: To provide a brushless motor furnished with dynamic pressure fluid bearing of high performance and high-speed operation capable of promoting the heat radiation and involving less thermal influence. SOLUTION: The brushless motor with dynamic pressure fluid bearing is structured so that radiation fins are installed on a rotor yoke and hole(s) is provided in a circuit board for releasing the heat from inside the rotor so that the heat radiating efficiency of the bearing surface is improved forcedly, and also temperature rise of the bearing surface is suppressed and heat emission from the internal oil is suppressed.