COUPLING OF PERMANENT MAGNETS IN ELECTRIC MOTORS

摘要

A permanent magnet for a permanent magnet electric motor is bonded to a rotor. A hole having a chamfered outer edge is formed in the permanent magnet. A corresponding mounting hole is formed in the body of the rotor. A bolt is threaded through the hole in the permanent magnet and threaded into the mounting hole of the rotor. An O-ring is positioned between the head of the bolt and the permanent magnet. The O-ring may be made of an elastomeric material which may prevent cracking of the permanent magnet as components of the electric motor expand and contract with fluctuations in temperature. A magnet may be held to a rotor by a dovetail or may include a flange to be held to the rotor by a retaining ring.