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US 2010/0133941 A1Published application
Permanent-Magnet (PM) Rotors and Systems
AssigneeTECO-Westinghouse Motor Company
InventorsXueqing Feng, Lijun Liu
Life of this patent
Estimating the term…
Abstract
Line-start permanent-magnet (LSPM) rotors, rotor components, and machines using LSPM rotors, where the PM rotors have PM bulks in W-like shapes, vent openings between PM bulks, and/or air gaps at ends of PM bulks in the W-like shapes.
Claims21
A line-start permanent-magnet (LSPM) rotor comprising:
- a rotor core having an axis of rotation and an outer perimeter, the rotor core defining a plurality of permanent magnet (PM) openings and a plurality of vent openings distinct from the PM openings;
- and
- a plurality of PM bulks disposed in the PM openings of the rotor core;
- where the rotor is configured such that the plurality of PM bulks define at least four W-like shapes, each W-like shape defined by at least two medial PM bulks disposed between at least two adjacent peripheral PM bulks;
- where the vent openings are disposed around the axis of rotation such that each vent opening is disposed between a medial PM bulk and the adjacent peripheral PM bulk.
2 more elements
A line-start permanent-magnet (LSPM) rotor comprising:
- a rotor core having an axis of rotation and an outer perimeter, the rotor core defining a plurality of permanent magnet (PM) openings;
- and
- a plurality of PM bulks disposed in the PM openings of the rotor core;
- where the rotor is configured such that the plurality of PM bulks define at least four W-like shapes, each W-like shape defined by at least two medial PM bulks disposed between at least two adjacent peripheral PM bulks;
- where adjacent W-like shapes share a common peripheral PM bulk;
- and
- where each peripheral PM bulk has a width that is between 150% and 250% of the width of one of the medial PM bulks.
4 more elements
A line-start permanent-magnet (LSPM) rotor comprising:
- a rotor core having an axis of rotation and an outer perimeter, the rotor core defining a plurality of permanent magnet (PM) openings and a plurality of vent openings;
- and
- a plurality of PM bulks disposed in the PM openings of the rotor core;
- where the rotor is configured such that the plurality of PM bulks define at least four W-like shapes, each W-like shape defined by at least two medial PM bulks disposed between at least two adjacent peripheral PM bulks;
- where the PM openings define air gaps, and at least one air gap is located at or near one end of each PM bulk;
- and
- where each peripheral PM bulk has an outer end and an inner end that is closer than its outer end to the axis of rotation, each medial PM bulk has an outer end and an inner end that is closer than its outer end to the axis of rotation, and the air gaps include:
- an outer peripheral air gap at or near the outer ends of each peripheral PM bulk, an inner peripheral air gap at or near the inner end of each peripheral PM bulk, an outer medial air gap at or near the outer ends of adjacent medial PM bulks, and an inner medial air gap at or near the inner end of each medial PM bulk.
5 more elements
Dependencies are inferred from the claim text.