ELECTRIC MACHINE

• US 20070222304A1
• Filed: 03/21/2007
• Published: 09/27/2007
• Est. Priority Date: 09/22/2004
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Jajtic, Zeljko, Volmert, Christian
• Granted Patent: US 7,800,256 B2
• Time in Patent Office: Days
• US Class Current: 310/12.180
• CPC Class Codes: H02K 1/02 characterised by the magnetic material
• CPC Class Codes: H02K 1/06 characterised by the shape, form or construction
• CPC Class Codes: H02K 1/246 Variable reluctance rotors
• CPC Class Codes: H02K 19/103 Motors having windings on the stator and a variable reluctance soft-iron rotor without windings
• CPC Class Codes: H02K 21/04 Windings on magnets for additional excitation ; Windings and magnets for additional excitation
• CPC Class Codes: H02K 41/033 with armature and magnets on one member, the other member being a flux distributor

Abstract

A linear or rotating electric synchronous machine includes a reluctance-secondary part, and a primary part, provided with a coil and permanent magnets. The primary part has teeth, with each tooth surrounded by a coil defining a coil axis. Arranged in each tooth is a permanent magnet which is surrounded by the coil and extends extending in parallel relationship to the coil axis of the coil. The secondary part is constructed for guiding a magnetic field and has teeth which define with the teeth of the primary part an air gap. The permanent magnet defines a magnetization direction in parallel to an air gap plane of the air gap, with the magnetization direction reversing from tooth to tooth.

Claims

1. An electric machine, in particular synchronous machine, comprising;

a primary part having teeth, each tooth surrounded by a coil defining a coil axis;

a permanent magnet arranged in each tooth and surrounded by the coil, with the permanent magnet extending in parallel relationship to the coil axis of the coil; and

a secondary part having teeth which define with the teeth of the primary part an air gap, said secondary part constructed for guiding a magnetic field,

wherein the permanent magnet defines a magnetization direction in parallel to an air gap plane of the air gap, with the magnetization direction reversing from tooth to tooth.

2. The electric machine of claim 1, wherein the secondary has a means for a magnetic return path and is free of magnetic sources.

3. The electric machine of claim 1, wherein the secondary part has a tooth pitch which is different than an integral multiple of a magnet pitch of the primary part.

4. The electric machine of claim 1, further comprising a second said secondary part, with the primary part being arranged between the two secondary parts, thereby forming a common magnetic circuit which relates to the two secondary parts and the primary part.

5. The electric machine of claim 1, further comprising a second said primary part, with the secondary part arranged between the two primary parts, thereby forming a common magnetic circuit which relates to the two primary parts and the secondary part.

6. A transport device, comprising an electric machine as set forth in claim 1.

7. The transport device of claim 6, wherein the electric machine is constructed for two-dimensional movement.

8. An electric machine, in particular synchronous machine, comprising:

a primary part having teeth, each tooth surrounded by a coil;

two permanent magnets arranged on each tooth; and

a secondary part having teeth and constructed for guiding a magnetic field,

wherein adjacent permanent magnets of neighboring teeth have a same magnetization direction.

9. The electric machine of claim 8, wherein the secondary has a means for a magnetic return path and is free of magnetic sources.

10. The electric machine of claim 8, wherein the secondary part has a tooth pitch which is different than an integral multiple of a magnet pitch of the primary part.

11. The electric machine of claim 8, further comprising a second said secondary part, with the primary part being arranged between the two secondary parts, thereby forming a common magnetic circuit which relates to the two secondary parts and the primary part.

12. The electric machine of claim 8, further comprising a second said primary part, with the secondary part arranged between the two primary parts, thereby forming a common magnetic circuit which relates to the two primary parts and the secondary part.

13. A transport device, comprising an electric machine as set forth in claim 8.

14. The transport device of claim 13, wherein the electric machine is constructed for two-dimensional movement.

15. An electric machine, in particular synchronous machine, comprising:

a primary part having teeth, each tooth surrounded by a coil, with neighboring coils of adjacent teeth being respectively connected via a yoke;

a permanent magnet arranged in each of the yokes; and

a secondary part having teeth and constructed for guiding a magnetic field,

wherein a magnetization direction of the permanent magnets reverses from yoke to yoke.

16. The electric machine of claim 15, wherein the secondary has a means for a magnetic return path and is free of magnetic sources.

17. The electric machine of claim 15, wherein the secondary part has a tooth pitch which is different than an integral multiple of a magnet pitch of the primary part.

18. The electric machine of claim 15, further comprising a second said secondary part, with the primary part being arranged between the two secondary parts, thereby forming a common magnetic circuit which relates to the two secondary parts and the primary part.

19. The electric machine of claim 15, further comprising a second said primary part, with the secondary part arranged between the two primary parts, thereby forming a common magnetic circuit which relates to the two primary parts and the secondary part.

20. A transport device, comprising an electric machine as set forth in claim 15.

21. The transport device of claim 20, wherein the electric machine is constructed for two-dimensional movement.