| 摘要 |
<p>[PROBLEMS] A magnet is magnetized in a stable magnetizing magnetic field to reduce inertia of a brushless motor without degrading motor characteristics. [MEANS FOR SOLVING PROBLEMS] A hollow-cylindrical rotor core (6) is installed on a shaft (5), and magnets (2) with a circular arc cross-section are installed on the outer peripheral surface of the rotor core (6). The rotor core (6) has an outer ring section (12) having a thickness Wr from the outer peripheral surface to the shaft (5) side, ribs (13) formed inside the outer ring section (12) and extending from the inner peripheral surface (12a) of the outer ring section to the shaft (5) side, and hollow sections (14) formed between the ribs (13). The outer diameter phin of the hollow sections (14) is set in the range of phic-2x3Wt<=phin<=phic-2x1.3Wt, with phic being the outer diameter of the rotor core (6) and Wt being the thickness of the magnets (2).</p> |
