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.

主权项

1. A method comprising:
providing a rotor body, the rotor body being generally cylindrical in shape, the rotor body having an outer surface; forming a mounting hole in the rotor body, the mounting hole positioned to couple to a threaded connector; providing a permanent magnet, the permanent magnet being generally in the form of an annular section, the concave surface of the permanent magnet having a diameter generally equal to the outer diameter of the rotor body, the permanent magnet having a hole formed therein positioned to receive the threaded connector, the hole having a countersink formed therein at the convex surface of the permanent magnet; positioning the permanent magnet on the outer surface of the rotor body so that the hole of the permanent magnet is in alignment with the mounting hole; positioning an elastomeric body within the countersink; positioning the threaded connector through the elastomeric body and the hole of the permanent magnet; coupling the threaded connector to the rotor body.