System and method for magnetization of permanent magnet rotors in electrical machines
AssigneeGeneral Electric Company
InventorCharles Stephens
Life of this patent
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Abstract
A system and method for manufacturing an electrical machine is provided. An array of permanent magnet segments is assembled around a rotor spindle. Desired orientation directions of the permanent magnet segments are determined. The assembled permanent magnet segments are then positioned in a magnetization fixture such that the desired orientation directions of the permanent magnet segments are aligned with corresponding flux directions of the magnetizing fixture.
Claims21
A method for manufacturing a rotor of an electrical machine, comprising:
- assembling an array of permanent magnet segments around a rotor spindle;
- determining desired orientation directions of the permanent magnet segments;
- and
- positioning the assembled permanent magnet segments in a magnetization fixture such that the desired orientation directions of the permanent magnet segments are aligned with corresponding flux directions of the magnetizing fixture,
- wherein the desired orientation directions of the permanent magnet segments are configured such that successive orientation directions vary from a direction generally normal to a direction of rotation of the rotor at a rotor pole D-axis to a direction generally tangential to the direction of rotation of the rotor at a rotor pole Q-axis.
(canceled)
A method for magnetizing a cylindrical machine element, comprising
- assembling an array of non-magnetized permanent magnet segments in a circular pattern;
- determining desired orientation directions of the non-magnetized permanent magnet segments, such that successive orientation directions vary from a direction generally normal to a direction of rotation of the rotor at a rotor pole D-axis to a direction generally tangential to the direction of rotation of the rotor at a rotor pole Q-axis;
- positioning the assembled non-magnetized permanent magnet segments in a magnetization fixture such that flux directions of the magnetizing fixture are generally aligned along the desired orientation directions of the permanent magnet segments;
- and
- energizing the magnetization fixture to magnetize the segments.
A rotor for an electrical machine, comprising:
- a rotor spindle;
- a plurality of permanent magnet segments assembled on the rotor spindle, wherein the assembly of the permanent magnet segments comprise progressively swept magnetic orientations obtained by applying a magnetic flux generally aligned with desired orientation directions of the permanent magnet segments;
- and
- a retaining ring disposed over the assembly of permanent magnet segments.
Dependencies are inferred from the claim text.