Electrical machine

• US 10,541,573 B2
• Filed: 03/21/2018
• Issued: 01/21/2020
• Est. Priority Date: 08/31/2012
• Status: Active Grant

• Current Assignee: Lappeenranta University of Technology
• Original Assignee: Lappeenranta University of Technology
• Inventors: Semken, Robert, Pyrhonen, Juha, Alexandrova, Yulia, Polikarpova, Maria
• Primary Examiner(s): Nguyen, Hanh N
• Application Number:
  US15/927,247
• Publication Number:
  US 20180212481A1
• Time in Patent Office: 671 Days
• Field of Search: 310216001-216037, 290 54, 290 55, 290 53, 290 1 B
• CPC Class Codes: F28D 7/005 the conduits for only one medium being tubes having bent portions or being assembled from bent tubes or being tubes having a toroidal configuration F28D7/0008, F28D7/02, F28D7/04, F28D7/06, F28D7/14 take precedence
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 1/16 Stator cores with slots for windings
• CPC Class Codes: H02K 1/18 Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
• CPC Class Codes: H02K 1/185 to outer stators
• CPC Class Codes: H02K 1/187 to inner stators
• CPC Class Codes: H02K 1/278 Surface mounted magnets; Inset magnets
• CPC Class Codes: H02K 1/28 Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
• CPC Class Codes: H02K 1/30 using intermediate parts, e.g. spiders
• CPC Class Codes: H02K 15/125 Heating or drying of machines in operational state, e.g. standstill heating
• CPC Class Codes: H02K 2213/12 Machines characterised by the modularity of some components
• CPC Class Codes: H02K 3/22 consisting of hollow conductors
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 3/505 for large machine windings, e.g. bar windings H02K3/51 takes precedence
• CPC Class Codes: H02K 7/1838 Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine
• CPC Class Codes: H02K 7/1869 Linear generators; sectional generators
• CPC Class Codes: Y10T 29/49874 Prestressing rod, filament or strand

Abstract

A segment for supporting electromagnetic coupling elements of a stator or rotor of an electrical machine comprises a plurality of elongate laminations which are stacked in a first direction to form a lamination stack with elongate edges of the laminations defining opposite first and second major faces of the lamination stack. The segment comprises a plurality of elongate compression devices passing internally through the lamination stack in the first direction and arranged to compress together the laminations in the lamination stack.

Claims

1. A rotor for an electrical machine, the rotor comprising:

a hub arranged so that the rotor can rotate with respect to a stator of the electrical machine about an axis of rotation;

a rim, the rim comprising a plurality of rotor rings spaced apart from each other;

the rim further comprising a plurality of rotor ring support tube assemblies, each rotor ring support tube assembly comprising a support tube and one or more spacing elements, the spacing elements being arranged between the rotor rings so that the rotor rings are spaced apart from each other in the axial direction;

the plurality of rotor rings comprising a plurality of electromagnetic coupling elements for electromagnetic coupling with a stator of the electrical machine, said electromagnetic coupling elements being mounted on laminations mounted on one or more middle rotor rings; and

a plurality of spokes arranged between the hub and the rims so as to mechanically couple the hub with the rim, the plurality of spokes being arranged in pairs either side of the rotor rings in the axial direction; and

each spoke being coupled to at least one of the rim and the hub;

each spoke in a pair of spokes is coupled to the rim at substantially the same position of the rim;

each spoke in the pair of spokes is coupled to the hub at substantially the same position on the hub;

the plurality of spokes are arranged tangentially with respect to a circumference of the hub; and

each spoke in a pair of spokes is coupled so that the spokes in the pair are offset from each other in the direction along the axis of rotation.

2. A rotor according to claim 1, in which a major axis of each spoke corresponds with a secant line passing through two points of the rim.

3. A rotor according to claim 1, comprising an adjuster for adjusting tension in one or more of the spokes.

4. A rotor according to claim 1, in which each spoke is coupled to at least one of the rim and the hub by a welded joint.

5. A rotor according to claim 1, in which hub, spokes and rim are integrally formed with each other.

6. A rotor according to claim 1, in which the electromagnetic coupling elements comprise permanent magnets.

7. A stator for an electrical machine, the stator comprising:

a hub arranged so that a rotor of the electrical machine can rotate with respect to the stator about an axis of rotation;

a rim, the rim comprising a plurality of stator rings spaced apart from each other;

the rim further comprising a plurality of stator ring support tube assemblies, each stator ring support tube assembly comprising a support tube and one or more spacing elements, the spacing elements being arranged between the stator rings so that the stator rings are spaced apart from each other in the axial direction;

the plurality of stator rings comprising a plurality of electromagnetic coupling elements for electromagnetic coupling with a rotor of the electrical machine, said electromagnetic coupling elements being mounted on laminations mounted on one or more middle stator rings;

a plurality of spokes arranged between the hub and the rim so as to mechanically couple the hub with the rim, the plurality of spokes being arranged in pairs either side of the stator rings in the axial direction; and

each spoke being coupled to at least one of the rim and the hub;

each spoke in a pair of spokes is coupled to the rim at substantially the same position of the rim;

each spoke in the pair of spokes is coupled to the hub at substantially the same position on the hub;

the plurality of spokes are arranged tangentially with respect to a circumference of the hub; and

each spoke in a pair of spokes is coupled so that the spokes in the pair are offset from each other in the direction along the axis of rotation.

8. A stator according to claim 7, in which a major axis of each spoke corresponds with a secant line passing through two points of the rim.

9. A stator according to claim 7, comprising an adjuster for adjusting tension in one or more of the spokes.

10. A stator according to claim 7, in which each spoke is coupled to at least one of the rim and the hub by a welded joint.

11. A stator according to claim 7, in which hub, spokes and rim are integrally formed with each other.

12. A stator according to claim 7, in which the electromagnetic coupling elements comprise permanent magnets.