Method of manufacturing rare earth permanent magnet rotor
AssigneeKollmorgen Corporation
InventorSamuel Noodleman
Life of this patent
Estimating the term…
Abstract
A rotor containing rare earth magnet material which can be assembled, machined and then magnetized. A stack of laminations is built up, pieces of virgin rare earth magnet material are inserted in the slots provided therefor in the laminations, the laminations with the rare earth magnet material are cast with aluminum, the cast rotor is machined and the rare earth magnet material is then magnetized. The strength of the rare earth magnets in the rotor may be adjusted after magnetization thereof.
Claims10
A method of manufacturing a cast, rare earth permanent magnet rotor comprising the steps of:
- a. assembling a stack of rotor laminations of ferrous material, said laminations having first and second sets of openings;
- b. inserting pieces of virgin rare earth magnet material in said first set of openings in said laminations;
- c. pouring non-ferrous casting material into said second set of openings in said laminations so as to form a rough-cast rotor assembly;
- d. machining said rough-cast rotor assembly to form a rotor assembly having discrete pole pieces;
- and then
- e. magnetizing said pieces of virgin rare earth magnet material.
A method of manufacturing a cast, rare earth permanent magnet rotor comprising the steps of:
- a. assembling a stack of laminations of ferrous material, said laminations having a plurality of equally spaced, structurally connected rotor pole portions with openings therein as well as slots formed by adjacent rotor pole portions;
- b. inserting pieces of virgin rare earth magnet material in said slots formed by said adjacent rotor pole portions;
- c. pouring non-ferrous casting material into said openings in said rotor pole portions so as to form a rough-cast rotor assembly;
- d. machining said rough-cast rotor assembly so as to remove the structural connections between adjacent rotor pole portions and form discrete pole pieces;
- and then
- e. magnetizing said pieces of virgin rare earth magnet material.
A method of manufacturing a cast, rare earth permanent magnet rotor comprising the steps of:
- a. assembling a stack of rotor laminations of ferrous material, said laminations having a plurality of equally spaced rotor pole portions with openings therein as well as slots formed by adjacent rotor pole portions;
- b. inserting pieces of virgin rare earth magnet material in said slots formed by said adjacent rotor pole portions;
- c. pouring non-ferrous casting material into said openings in said rotor pole portions so as to form a rough-cast rotor assembly;
- d. machining said rough-cast rotor assembly so as to form a rotor assembly having discrete pole pieces;
- and then
- e. magnetizing said pieces of virgin earth magnet material with between about 12,000 and about 18,000 oersteds to develop a field strength of between about 9,000 and about 12,000 gauss.
A method of manufacturing a cast, rare earth permanent magnet rotor comprising the steps of:
- a. assembling a stack of rotor laminations of ferrous material, said laminations having a plurality of equally spaced, structurally connected rotor pole portions with openings therein as well as slots formed by adjacent rotor pole portions;
- b. inserting pieces of virgin rare earth magnet material in said slots formed by said adjacent rotor pole portions;
- c. pouring non-ferrous casting material into said openings in said rotor pole portions so as to form a rough-cast rotor assembly;
- d. machining said rough-cast rotor assembly so as to remove the structural connections between adjacent rotor pole portions and form discrete pole pieces;
- and then
- e. magnetizing said pieces of virgin rare earth magnet material with between about 12,000 and about 18,000 oersteds to develop a field strength of between about 9,000 and about 12,000 gauss.
Dependencies are inferred from the claim text.