ROTOR FOR BRUSHLESS MOTOR

摘要

[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 Õn of the hollow sections 14 is set in the range of Õc - 2 × 3 Wt ‰¤ Õn ‰¤ Õc - 2 × 1.3 Wt, with Õc being the outer diameter of the rotor core 6 and Wt being the thickness of the magnets 2.