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METHOD OF MANUFACTURE OF A PERMANENT-MAGNETIZED ROTOR FOR A SYNCHRONOUS MOTOR

  • US 3,728,786 A
  • Filed: 11/15/1971
  • Issued: 04/24/1973
  • Est. Priority Date: 11/16/1970
  • Status: Expired due to Term
First Claim
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1. A method of manufacture of a permanent-magnetized rotor for a small multipolar synchronous motor for a rectangular tape made of a flexible plastomagnetic material comprising an organic binder loaded with magnetic powder, comprising the steps of;

  • cutting said flexible tape to a suitable length;

    winding the length of tape onto a cylindrical mandrel to shape said length into the form of a ring having a trapezoidal cross-section;

    performing a controlled curing operation on the organic binder of said ring such that said ring has a predetermined stiffness but retains the ability to slightly expand;

    introducing said ring and a shaft into a mold having a cylindrical wall, said wall, said ring and said shaft being in concentric relationship, said wall having an internal diameter which precisely corresponds to the desired external diameter of the finished rotor;

    injecting a molding material into the mold thereby expanding said ring against said wall;

    soldifying said molding material to thereby form an integral structure of said shaft, said molding material and said ring.

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