Flux-switching linear permanent magnet machine with yokeless translator

Patent metadata

Field	Value
Publication number	US-9281735-B2
Application number	US-201313734404-A
Country	US
Kind code	B2
Filing date	Jan 4, 2013
Priority date	Jan 5, 2012
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

Advantageous motors, such as flux-switching linear synchronous motors (FSLSMs) are provided. In an FSLSM, all magnets can be magnetized in the same direction. In addition, an FSLSM can be yokeless and can have two stators displaced from one another by half a pole pitch. FSLSMs of the subject invention are cost-effective and provide high thrust, and can operate well even under fault conditions.

First claim

We claim:

1. A flux-switching linear synchronous motor (FSLSM), comprising:
at least two permanent magnets;
a coil wrapped around each permanent magnet; and
at least one stator,
wherein all permanent magnets of the FSLSM are magnetized in the same direction,
wherein the permanent magnets are disposed on a first surface of the at least one stator,
wherein the first surface of the at least one stator extends along the FSLSM in a first direction, and
wherein each permanent magnet is arranged such that its magnetization direction is parallel to the first direction.

2. The FSLSM according to claim 1 , comprising two stators, wherein a first stator is disposed below the permanent magnets and a second stator is disposed above the permanent magnets.

3. The FSLSM according to claim 2 , wherein each stator comprises stator teeth and teeth gaps between the stator teeth, wherein the first stator and the second stator are displaced from each other by half a pole pitch such that the stator teeth of the first stator are aligned with the teeth gaps of the second stator and the stator teeth of the second stator are aligned with the teeth gaps of the first stator.

4. The FSLSM according to claim 1 , wherein the FSLSM is yokeless.

5. The FSLSM according to claim 1 , comprising at least six permanent magnets, wherein the FSLSM is a three-phase FSLSM.

6. The FSLSM according to claim 5 , comprising six slots and ten poles.

7. The FSLSM according to claim 1 , comprising at least five permanent magnets, wherein the FSLSM is a five-phase FSLSM.

8. A flux-switching linear synchronous motor (FSLSM), comprising:
at least two permanent magnets;
a coil wrapped around each permanent magnet; and
at least one stator,
wherein all permanent magnets of FSLSM are magnetized in the same direction, and
wherein all permanent magnets and all coils are encapsulated in a non-magnetic encapsulating material, thereby forming a one-piece translator containing all permanent magnets and all coils of the FSLSM.

9. The FSLSM according to claim 8 , wherein the non-magnetic encapsulating material comprises a thermally-conducting resin.

10. The FSLSM according to claim 1 , wherein each permanent magnet comprises NdFeB.

11. The FSLSM according to claim 1 , wherein the at least one stator comprises steel.

12. A flux-switching linear synchronous motor (FSLSM), comprising:
at least two permanent magnets;
a coil wrapped around each permanent magnet; and
at least one stator,
wherein all permanent magnets of the FSLSM are magnetized in the same direction,
wherein a split ratio of the FSLSM is from about 0.27 to about 0.32,
wherein a stator tooth width ratio of the FSLSM is from about 0.34 to about 0.35,
wherein a stator tooth height ratio of the FSLSM is from about 0.37 to about 0.40, and
wherein a translator tooth width ratio of the FSLSM is from about 0.20 to about 0.22.

13. The FSLSM according to claim 1 , wherein a pole pitch of the FSLSM is from 20 mm to 30 mm,
wherein a width of each permanent magnet is from 2.5 mm to 3 mm,
wherein a height of each permanent magnet is from 30 mm to 40 mm,
wherein a permanent magnet pole pitch is from 35 mm to 45 mm,
wherein an air gap is from 0.9 mm to 1.1 mm,
wherein a width of each stator tooth of the at least one stator is from 8 mm to 9 mm,
wherein a height of each stator tooth of the at least one stator is from 10 mm to 12 mm,
wherein a translator tooth width of the FSLSM is from 18 mm to 20 mm,
wherein a magnet residual flux density of the FSLSM is from 1 T to 1.5 T,
wherein a machine depth of the FSLSM is from 80 mm to 120 mm, and
wherein a translator length of the FSLSM is from 220 mm to 260 mm.

14. The FSLSM according to claim 8 , comprising two stators, wherein a first stator is disposed below the permanent magnets and a second stator is disposed above the permanent magnets,
wherein each stator comprises stator teeth and teeth gaps between the stator teeth,
wherein the first stator and the second stator are displaced from each other by half a pole pitch such that the stator teeth of the first stator are aligned with the teeth gaps of the second stator and the stator teeth of the second stator are aligned with the teeth gaps of the first stator, and
wherein the FSLSM is yokeless.

15. The FSLSM according to claim 14 , wherein the non-magnetic encapsulating material comprises a thermally-conducting resin,
wherein each permanent magnet comprises NdFeB, and
wherein each stator comprises steel.

16. The FSLSM according to claim 15 , wherein a split ratio of the FSLSM is from about 0.27 to about 0.32,
wherein a stator tooth width ratio of the FSLSM is from about 0.34 to about 0.35,
wherein a stator tooth height ratio of the FSLSM is from about 0.37 to about 0.40, and
wherein a translator tooth width ratio of the FSLSM is from about 0.20 to about 0.22.

17. The FSLSM according to claim 16 , wherein a pole pitch of the FSLSM is from 20 mm to 30 mm,
wherein a width of each permanent magnet is from 2.5 mm to 3 mm,
wherein a height of each permanent magnet is from 30 mm to 40 mm,
wherein a permanent magnet pole pitch is from 35 mm to 45 mm,
wherein an air gap is from 0.9 mm to 1.1 mm,
wherein a width of each stator tooth of the at least one stator is from 8 mm to 9 mm,
wherein a height of each stator tooth of the at least one stator is from 10 mm to 12 mm,
wherein a translator tooth width of the FSLSM is from 18 mm to 20 mm,
wherein a magnet residual flux density of the FSLSM is from 1 T to 1.5 T,
wherein a machine depth of the FSLSM is from 80 mm to 120 mm, and
wherein a translator length of the FSLSM is from 220 mm to 260 mm.

18. The FSLSM according to claim 8 , comprising two stators, wherein a first stator is disposed below the permanent magnets and a second stator is disposed above the permanent magnets.

19. The FSLSM according to claim 8 , wherein each stator comprises stator teeth and teeth gaps between the stator teeth, wherein the first stator and the second stator are displaced from each other by half a pole pitch such that the stator teeth of the first stator are aligned with the teeth gaps of the second stator and the stator teeth of the second stator are aligned with the teeth gaps of the first stator.

20. The FSLSM according to claim 8 , wherein the FSLSM is yokeless.

Assignees

• Rensselaer Polytech Inst

Inventors

• Gandhi Arun
• Parsa Leila

Classifications

• Y10T29/49009

  Dynamoelectric machine · CPC title

• H02K41/033 Primary

  with armature and magnets on one member, the other member being a flux distributor · CPC title

• H02K15/03

  having permanent magnets · CPC title