Interior permanent magnet machine with hybrid rotor topology

Patent metadata

Field	Value
Publication number	US-11063485-B2
Application number	US-201916408763-A
Country	US
Kind code	B2
Filing date	May 10, 2019
Priority date	May 11, 2018
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

An interior permanent magnet motor assembly including a stator and a rotor is provided. The stator includes electromagnetic windings. The rotor is disposed concentrically with the stator about a rotor axis and the rotor has a plurality of rotor segments. The plurality of rotor segments may include a first rotor segment and a second rotor segment. The first rotor segment may have first pockets being arranged to receive at least a first magnet of a first magnet set according to a first rotor topology. The second rotor segment may be axially stacked relative to the first rotor segment about the rotor axis. The second rotor segment may be arranged to receive at least a second magnet of a second magnet set according to a second rotor topology having a configuration that is different than the first rotor topology.

First claim

Having thus described the present disclosure, it is claimed:

1. An interior permanent magnet motor assembly comprising:
a stator having electromagnetic windings; and
a rotor that is disposed concentrically with the stator about a rotor axis, the rotor having a plurality of rotor segments, the plurality of rotor segments including:
a first rotor segment having a pair of first pockets being arranged to receive a first magnet set according to a first rotor topology, the first magnet set arranged in a V-shape configuration, and
a second rotor segment that is axially stacked relative to the first rotor segment about the rotor axis, the second rotor segment being arranged to receive at least a second magnet of a second magnet set according to a second rotor topology having a configuration that is different than the first rotor topology, the second rotor topology being defined by an orientation of the first pockets in a spoke-type configuration, the spoke-type configuration being further defined by at least one of the first pockets being further arranged to align with a radial axis extending from a center point of the second rotor segment to define the spoke-type configuration, wherein the magnets of the first magnet set in the V-shape configuration are axially longer than the second magnet(s) of the second rotor segment in the spoke-type configuration, the first magnet set and the second magnet(s) formed of the same material.

2. The assembly of claim 1 , further comprising one or more flux barriers disposed at a flux d-axis proximate the circumference of the rotor.

3. The assembly of claim 1 , the second rotor segment having second pockets being arranged to receive a second magnet of the second magnet set, the first pockets and the second pockets being arranged with one another such that a first magnetism of the first magnet travels in a first direction from an outer rotor surface toward the rotor axis and such that a second magnetism of the second magnet located adjacent the first magnet travels in a second direction from the rotor axis toward the outer rotor surface.

4. The assembly of claim 3 , wherein the second rotor segment defines a pair of non-magnet pockets, each of the pair of non-magnet pockets extending from one of a plurality of magnet pockets.

5. The assembly of claim 4 , each of the pair of non-magnet pockets being arranged with one another to define a crown shape.

6. The assembly of claim 1 , the first rotor topology being a topology in which a plurality of first magnet pockets of the first rotor segment and a plurality of second magnet pockets of the second rotor segment are arranged with one another such that one of the plurality of first magnet pockets at least partially extends over one of the plurality of second magnet pockets from an axial perspective.

7. An interior permanent magnet motor assembly comprising:
a stator having electromagnetic windings; and
a rotor that is disposed concentrically with the stator about a rotor axis, the rotor having a plurality of rotor segments, the plurality of rotor segments including:
a first rotor segment having a pair of first pockets being arranged to receive a first magnet set according to a first rotor topology, each magnet of the first magnet set arranged in a V-shape configuration, and
a second rotor segment that is axially stacked relative to the first rotor segment about the rotor axis, the second rotor segment being arranged to receive at least a second magnet of a second magnet set according to a second rotor topology having a configuration that is different than the first rotor topology, the second rotor topology being defined by an orientation of the first pockets in a rectangular bar-shape configuration, the rectangular bar-shape configuration being further defined by at least one of the first pockets being further arranged to align with a radial axis extending from a center point of the second rotor segment to define the rectangular bar-shape configuration, wherein each magnet of the second magnet set has a rectangular bar-shape is axially longer than the first magnet set in the V-shape configuration, the first magnet set and the second magnet(s) formed of the same material, the second rotor segment defining a slot that extends from an outer surface, the slot defining a slot circumferential width and each of the first pockets defining a magnet pocket circumferential width that is greater than the slot circumferential width.

8. The rotor of claim 7 , the first rotor segment and the second rotor segment being arranged with one another such that at least one of the plurality of first magnet pockets extends over at least one of the plurality of second magnet pockets from an axial perspective.

9. The assembly of claim 7 further comprising one or more flux barriers disposed at a flux d-axis proximate the circumference of the rotor.

Assignees

• Steering Solutions Ip Holding

Inventors

• Paul Subhra
• Islam Mohammed R

Classifications

• H02K1/2766 Primary

  having a flux concentration effect · CPC title

• H02K1/12

  Stationary parts of the magnetic circuit · CPC title

• H02K21/14

  with magnets rotating within the armatures · CPC title

• H02K1/2773

  consisting of tangentially magnetized radial magnets · CPC title

• H02K21/24

  with magnets axially facing the armatures, e.g. hub-type cycle dynamos · CPC title