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US 10,594,179 B2Granted
Alternating flux barrier air gap in a spoke type machine
AssigneeWisconsin Alumni Research Foundation
InventorsWenbo Liu, Thomas A. Lipo
Life of this patent
Estimating the term…
Abstract
The rotor includes ribs and permanent magnets mounted as spokes in pole pairs. A second wall of each rotor air gap of a plurality of rotor air gaps is parallel to an edge of a permanent magnet of the permanent magnets. A length of the second wall is less than 80% of a length of the edge. A fifth wall of each rotor air gap of the rotor air gaps is formed by a first side of a rib. Each pair of permanent magnets has an associated pair of rotor air gaps of the rotor air gaps. A first rotor air gap of each pair of rotor air gaps of the rotor air gaps is a mirror image of a second rotor air gap of each pair of rotor air gaps. Each pair of rotor air gaps is separated by an associated rib of the plurality of ribs.
Claims20
A rotor comprising:
- a first rotor core;
- a plurality of ribs that each extend from the first rotor core;
- a plurality of rotor core teeth that each extend from the first rotor core, wherein a plurality of rotor air gaps are formed in the first rotor core between a rib of the plurality of ribs and a tooth of the plurality of rotor core teeth;
- a second rotor core that extends from the plurality of ribs, from the plurality of rotor core teeth, and from a first wall of each rotor air gap of the plurality of rotor air gaps;
- and
- a plurality of permanent magnets mounted as spokes in pole pairs within the second rotor core, wherein each permanent magnet of the plurality of permanent magnets is included in only one pole pair of the pole pairs, wherein each pole pair of the pole pairs includes two adjacent permanent magnets of the plurality of permanent magnets;
- wherein a second wall of each rotor air gap of the plurality of rotor air gaps borders a portion of an edge of a permanent magnet of the plurality of permanent magnets, wherein a length of the portion of the edge is greater than 40% and less than 80% of a length of the edge, wherein only one rotor air gap borders each permanent magnet of the plurality of permanent magnets,
- wherein a third wall of each rotor air gap of the plurality of rotor air gaps is formed by a first side of a tooth of the plurality of rotor core teeth,
- wherein a fourth wall of each rotor air gap of the plurality of rotor air gaps is formed by the first rotor core,
- wherein a fifth wall of each rotor air gap of the plurality of rotor air gaps is formed by a first side of a rib of the plurality of ribs,
- wherein the first wall is connected between the second wall and the fifth wall, wherein the third wall is connected between the second wall and the fourth wall, wherein the fourth wall is connected between the third wall and the fifth wall,
- wherein each pole pair of permanent magnets of the plurality of permanent magnets has an associated pair of rotor air gaps of the plurality of rotor air gaps, wherein a first rotor air gap of each pair of rotor air gaps of the plurality of rotor air gaps is a mirror image of a second rotor air gap of each pair of rotor air gaps of the plurality of rotor air gaps, wherein each pair of rotor air gaps of the plurality of rotor air gaps is separated by an associated rib of the plurality of ribs.
9 more elements
A rotor comprising:
- a first rotor core;
- a plurality of ribs that each extend from the first rotor core;
- a plurality of rotor core teeth that each extend from the first rotor core, wherein a plurality of rotor air gaps are formed in the first rotor core between a rib of the plurality of ribs and a tooth of the plurality of rotor core teeth;
- a second rotor core that extends from the plurality of ribs, from the plurality of rotor core teeth, and from a first wall of each rotor air gap of the plurality of rotor air gaps;
- and
- a plurality of permanent magnets mounted as spokes in pole pairs within the second rotor core, wherein each permanent magnet of the plurality of permanent magnets is included in only one pole pair of the pole pairs, wherein each pole pair of the pole pairs includes two adjacent permanent magnets of the plurality of permanent magnets;
- wherein a second wall of each rotor air gap of the plurality of rotor air gaps borders an edge of a permanent magnet of the plurality of permanent magnets, wherein a length of the second wall is greater than 40% and less than 80% of a length of the edge, wherein only one rotor air gap borders each permanent magnet of the plurality of permanent magnets,
- wherein a third wall of each rotor air gap of the plurality of rotor air gaps is formed by a first side of a tooth of the plurality of rotor core teeth,
- wherein a fourth wall of each rotor air gap of the plurality of rotor air gaps is formed by the first rotor core,
- wherein a fifth wall of each rotor air gap of the plurality of rotor air gaps is formed by a first side of a rib of the plurality of ribs,
- wherein the first wall is connected between the second wall and the fifth wall, wherein the third wall is connected between the second wall and the fourth wall, wherein the fourth wall is connected between the third wall and the fifth wall,
- wherein each pole pair of permanent magnets of the plurality of permanent magnets has an associated pair of rotor air gaps of the plurality of rotor air gaps, wherein a first rotor air gap of each pair of rotor air gaps of the plurality of rotor air gaps is a mirror image of a second rotor air gap of each pair of rotor air gaps of the plurality of rotor air gaps, wherein each pair of rotor air gaps of the plurality of rotor air gaps is separated by an associated rib of the plurality of ribs.
9 more elements
An electric machine comprising:
- a rotor comprising
- a first rotor core;
- a plurality of ribs that each extend from the first rotor core;
- a plurality of rotor core teeth that each extend from the first rotor core, wherein a plurality of rotor air gaps are formed in the first rotor core between a rib of the plurality of ribs and a tooth of the plurality of rotor core teeth;
- and
- a second rotor core that extends from the plurality of ribs, from the plurality of rotor core teeth, and from a first wall of each rotor air gap of the plurality of rotor air gaps;
- a plurality of permanent magnets mounted as spokes in pole pairs within the rotor, wherein each permanent magnet of the plurality of permanent magnets is included in only one pole pair of the pole pairs, wherein each pole pair of the pole pairs includes two adjacent permanent magnets of the plurality of permanent magnets;
- a stator comprising a plurality of slots and a plurality of teeth, wherein a slot of the plurality of slots is positioned between a pair of the plurality of teeth, and further wherein the stator is mounted on a first side of the rotor separated by an air gap between a surface of the second rotor core and a tooth of the plurality of teeth;
- and
- a stator winding wound about the stator to form a number of poles between a set of terminals;
- wherein a second wall of each rotor air gap of the plurality of rotor air gaps borders a portion of an edge of a permanent magnet of the plurality of permanent magnets, wherein a length of the portion of the edge is greater than 40% and less than 80% of a length of the edge, wherein only one rotor air gap borders each permanent magnet of the plurality of permanent magnets,
- wherein a third wall of each rotor air gap of the plurality of rotor air gaps is formed by a first side of a tooth of the plurality of rotor core teeth,
- wherein a fourth wall of each rotor air gap of the plurality of rotor air gaps is formed by the first rotor core,
- wherein a fifth wall of each rotor air gap of the plurality of rotor air gaps is formed by a first side of a rib of the plurality of ribs,
- wherein the first wall is connected between the second wall and the fifth wall, wherein the third wall is connected between the second wall and the fourth wall, wherein the fourth wall is connected between the third wall and the fifth wall,
- wherein each pole pair of permanent magnets of the plurality of permanent magnets has an associated pair of rotor air gaps of the plurality of rotor air gaps, wherein a first rotor air gap of each pair of rotor air gaps of the plurality of rotor air gaps is a mirror image of a second rotor air gap of each pair of rotor air gaps of the plurality of rotor air gaps, wherein each pair of rotor air gaps of the plurality of rotor air gaps is separated by an associated rib of the plurality of ribs.
13 more elements
Dependencies are inferred from the claim text.