Rotor of reduced weight for an electric machine

• US 8,188,631 B2
• Filed: 04/19/2010
• Issued: 05/29/2012
• Est. Priority Date: 04/17/2009
• Status: Active Grant

• Current Assignee: Flender GmbH (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Brach, Karsten, Meyer, Christian, Schlawitz, Andre, Balzer, Christoph, Schüring, Ingo
• Primary Examiner(s): Leung, Quyen
• Assistant Examiner(s): GONZALEZ QUINONES, JOSE A
• Application Number:
  US12/762,748
• Publication Number:
  US 20100264775A1
• Time in Patent Office: 771 Days
• Field of Search: 310/216.001, 310/216.007, 310/216.053, 310/216.057, 310/216.061, 310/216.121, 310/216.122, 310216127-129, 310/216.133
• US Class Current: 310/216.133
• CPC Class Codes: H02K 1/223 Rotor cores with windings and permanent magnets for additional excitation in synchronous motors or generators H02K21/042; in synchronous motors having additional short-circuited winding for starting as an asynchronous motor H02K21/46
• CPC Class Codes: H02K 1/276 Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
• CPC Class Codes: H02K 1/30 using intermediate parts, e.g. spiders

Abstract

A rotor for an electrical machine includes a first shaft part and a second shaft part, which is arranged separately from the first shaft part. A first supporting element is connected in a manner fixed against rotation to the first shaft part, and a second supporting element is connected in a manner fixed against rotation to the second shaft part. The rotor has a yoke which connects the first supporting element to the second supporting element and includes a plurality of laminates arranged one behind the other, and which has cutouts extending in the direction of the axis of rotation in the interior of the yoke, and permanent magnets arranged in the cutouts. The yoke has holes extending in the direction of the axis of rotation, with tensioning pins extending through the holes in the yoke to brace the laminates.

Claims

1. A rotor for an electrical machine, comprising:

a first shaft part;

a second shaft part arranged separately from the first shaft part, said first and second shaft parts being arranged one behind the other with respect to a common axis of rotation;

a first supporting element connected in a manner fixed against rotation to the first shaft part;

a second supporting element connected in a manner fixed against rotation to the second shaft part;

a yoke connecting the first supporting element to the second supporting element and having a plurality of laminates arranged one behind the other, said yoke having an interior provided with cutouts which extend in a direction of the axis of rotation, and permanent magnets arranged in the cutouts, said yoke having holes extending in the direction of the axis of rotation;

tensioning pins extending through the holes in the yoke to brace the laminates; and

ribs for connecting the first and second shaft parts, the first and second supporting elements and the yoke to one another,

wherein the permanent magnets are fixed in the cutouts by an adhesive.

2. The rotor of claim 1, wherein the cutouts on tangential outer sides have a size which is greater than a width of the permanent magnets.

3. The rotor of claim 1, wherein a first plurality of the holes is arranged between the cutouts.

4. The rotor of claim 3, wherein a second plurality of the holes is arranged offset in a radial direction with respect to the first plurality of holes.

5. The rotor of claim 1, wherein at least two permanent magnets are arranged in each of the cutouts, and further comprising an amagnetic separating wall separating the at least two permanent magnets from one another and configured to absorb a centrifugal force of the permanent magnets as the rotor rotates and to divert the centrifugal force into a part of the yoke in confronting relationship to the axis of rotation.

6. The rotor of claim 1, wherein at least two permanent magnets are arranged in each of the cutouts and separated from one another by an air gap.

7. The rotor of claim 1, wherein the yoke has an end side in confronting relationship to the second supporting element, said end side abutting the second supporting element.

8. A wind power generator, comprising a rotor a first shaft part, a second shaft part arranged separately from the first shaft part, said first and second shaft parts being arranged one behind the other with respect to a common axis of rotation, a first supporting element connected in a manner fixed against rotation to the first shaft part, a second supporting element connected in a manner fixed against rotation to the second shaft part, a yoke connecting the first supporting element to the second supporting element and having a plurality of laminates arranged one behind the other, said yoke having an interior provided with cutouts which extend in a direction of the axis of rotation, and permanent magnets arranged in the cutouts, said yoke having holes extending in the direction of the axis of rotation, and tensioning pins extending through the holes in the yoke to brace the laminates, and ribs for connecting the first and second shaft parts, the first and second supporting elements and the yoke to one another, wherein the permanent magnets are fixed in the cutouts by an adhesive.

9. The wind power generator of claim 8, wherein the cutouts on tangential outer sides have a size which is greater than a width of the permanent magnets.

10. The wind power generator of claim 8, wherein a first plurality of the holes is arranged between the cutouts.

11. The rotor of claim 10, wherein a second plurality of the holes is arranged offset in a radial direction with respect to the first plurality of holes.

12. The wind power generator of claim 8, wherein at least two permanent magnets are arranged in each of the cutouts, and further comprising an amagnetic separating wall separating the at least two permanent magnets from one another and configured to absorb a centrifugal force of the permanent magnets as the rotor rotates and to divert the centrifugal force into a part of the yoke in confronting relationship to the axis of rotation.

13. The wind power generator of claim 8, wherein at least two permanent magnets are arranged in each of the cutouts and separated from one another by an air gap.

14. The wind power generator of claim 8, wherein the yoke has an end side in confronting relationship to the second supporting element, said end side abutting the second supporting element.