Apparatus and method for an interior permanent magnet with rotor hybridization

Patent metadata

Field	Value
Publication number	US-11349358-B2
Application number	US-201916509054-A
Country	US
Kind code	B2
Filing date	Jul 11, 2019
Priority date	Jul 11, 2019
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

An interior permanent magnet machine includes a stator having electromagnetic windings. The machine also includes a rotor that is disposed concentrically with the stator and is disposed about a rotor axis, the rotor comprising a rotor core defined by a first rotor lamination that is arranged to receive a first magnet set according to a first rotor topology and a second magnet set according to a second rotor topology.

First claim

Having thus described the invention, it is claimed:

1. An interior permanent magnet machine comprising:
a stator having electromagnetic windings; and
a rotor that is disposed concentrically with the stator and is disposed about a rotor axis, the rotor comprising a rotor core at least partially defined by:
a first rotor lamination that is arranged to receive a first magnet set according to a first rotor topology and a second magnet set according to a second rotor topology; and
a second rotor lamination located axially adjacent to the first rotor lamination and is arranged to receive a third magnet set according to the second rotor topology and a fourth magnet set according to the first rotor topology, wherein the first magnet set and the third magnet set are radially and circumferentially aligned and the second magnet set and the fourth magnet set are radially and circumferentially aligned.

2. The interior permanent magnet machine of claim 1 , wherein coggings of the first rotor topology and the second rotor topology are 180 degrees out of phase with each other.

3. The interior permanent magnet machine of claim 1 , wherein the first rotor topology is defined by a first magnet pocket and a second magnet pocket that extends from the first magnet pocket.

4. The interior permanent magnet machine of claim 3 , wherein the first magnet pocket includes a first edge and the second magnet pocket includes a second edge that extends from the first edge.

5. The interior permanent magnet machine of claim 4 , wherein the first edge extends along a first axis and the second edge extends along a second axis, wherein the first axis and the second axis are disposed in a non-perpendicular and non-parallel relationship with respect to each other.

6. The interior permanent magnet machine of claim 5 , wherein the second rotor topology is defined by a third magnet pocket that is circumferentially offset from the first magnet pocket and the second magnet pocket.

7. The interior permanent magnet machine of claim 6 , wherein the third magnet pocket includes an edge that extends along a third axis that intersects at least one of the first axis and the second axis.

8. The interior permanent magnet machine of claim 1 , wherein the first rotor topology of the first magnet set is arranged as a V-shaped interior permanent magnet rotor segment, the second rotor topology of the second magnet set is arranged as a Bar-shaped interior permanent magnet rotor segment.

9. The interior permanent magnet machine of claim 1 , wherein the rotor includes at least one flux barrier, the flux barrier being placed near the inner stator periphery within the rotor core.

10. The interior permanent magnet machine of claim 1 , wherein the rotor includes at least one pocket, the pocket being within the rotor core.

11. A rotor for an interior permanent magnet machine comprising:
a rotor core at least partially defined by a first rotor lamination that defines a first magnet pocket, a second magnet pocket, and a third magnet pocket, the first magnet pocket having a first edge that extends along a first axis, the second magnet pocket having a second edge that extends from the first edge along a second axis, the first axis being disposed in a non-parallel relationship with respect to the second axis, the third magnet pocket circumferentially offset from the first magnet pocket and the second magnet pocket, the third magnet pocket having an edge that extends along a third axis that is disposed in a non-parallel relationship with respect to the first axis and the second axis.

12. The rotor of claim 11 , further comprising a flux barrier disposed on an outer surface of the rotor core.

13. The rotor of claim 11 , wherein the third axis bisects at least one of the first axis and the second axis.

14. The rotor of claim 11 , wherein the first rotor lamination further defines a first nonmagnetic pocket that extends from the first magnet pocket towards an outer surface of the rotor core and a second nonmagnetic pocket that extends from the second magnet pocket towards the outer surface of the rotor core.

15. The rotor of claim 14 , wherein the first rotor lamination further defines a third nonmagnetic pocket that extends from the third magnet pocket towards the second magnet pocket.

16. An interior permanent magnet machine comprising:
a stator having electromagnetic windings; and
a rotor that is disposed concentrically with the stator and is disposed about a rotor axis, the rotor comprising a rotor core at least partially defined by a first rotor lamination and a second rotor lamination located axially adjacent to the first rotor lamination, wherein the first rotor lamination includes a V-shaped interior permanent magnet rotor segment disposed therein, wherein the second rotor lamination includes a Bar-shaped interior permanent magnet rotor segment disposed therein, wherein the V-shaped interior permanent magnet rotor segment and the Bar-shaped interior permanent magnet rotor segment are circumferentially and radially aligned.

Assignees

• Steering Solutions Ip Holding

Inventors

• Paul Subhra
• Islam Rakibul

Classifications

• H02K21/042

  with permanent magnets and field winding both rotating · CPC title

• H02K1/2766 Primary

  having a flux concentration effect · CPC title

• H02K21/14

  with magnets rotating within the armatures · CPC title

• H02K1/2773 Primary

  consisting of tangentially magnetized radial magnets · CPC title

• H02K1/24

  Rotor cores with salient poles {; Variable reluctance rotors} · CPC title