Permanent magnet rotor with annular rib coupling

摘要

A motor rotor includes a hub having a peripheral wall. A metal ring includes an engaging portion. The metal ring is formed by bending a strip of metal plate to form a cylindrical ring. The metal plate includes first and second positioning portions on two ends thereof. The first and second positioning portions are coupled with each other to form the engaging portion. The metal ring is coupled to an inner peripheral face of the peripheral wall of the hub. A magnet ring is coupled to an inner peripheral face of the metal ring.