Bandage tape wound permanent magnet rotor of an electric machine

Patent metadata

Field	Value
Publication number	US-10211711-B2
Application number	US-201615138911-A
Country	US
Kind code	B2
Filing date	Apr 26, 2016
Priority date	Apr 27, 2015
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A rotor of an electric machine includes a plurality of permanent magnets arranged on an exterior of the rotor, and a bandage tape wound around the permanent magnets for fixing the permanent magnets in place. The bandage tape includes a first tape end, which is fastened to a surface of at least one permanent magnet, and a second tape end, which is an end of an outermost tape section of the bandage tape and is fastened to a tape section of the bandage tape disposed below the outermost tape section. The bandage tape is wound around the permanent magnets with a prestress such that in a region of each permanent magnet, at least one tape section of the bandage tape has a predeterminable minimum prestress.

First claim

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims and includes equivalents of the elements recited therein:

1. A rotor of an electric machine, comprising:
a plurality of permanent magnets arranged on an exterior of the rotor; and
a bandage tape made of a carbon fiber-reinforced plastic (CFRP) or a glass fiber-reinforced plastic (FRP) and wound around the permanent magnets for fixing the permanent magnets in place, said bandage tape including a first tape end and a second tape end, with the first tape end being fastened to a surface of at least one permanent magnet, said bandage tape being spirally wound around the permanent magnets with a prestress adequate to hold the permanent magnets in place on the rotor, wherein the spirally wound bandage tape comprises a first tape section that extends over at least one half of a longitudinal extent of the rotor and wound in a first winding direction, a second tape section that extends over the axial extent of the rotor and wound in a second winding direction opposite to the first winding direction, and a third tape section wound in the first winding direction and including the second tape end, wherein the second tape end is welded to the tape section disposed below the third tape section and at least two tape sections having opposite winding directions are arranged on top of one another along the longitudinal extent of the rotor.

2. The rotor of claim 1 , wherein the first tape end is fastened to the surface of the at least one permanent magnet by a bonded connection.

3. The rotor of claim 2 , wherein the bonded connection comprises at least one adhesive strip to fix the first tape end to the surface of at least one permanent magnet.

4. The rotor of claim 1 , wherein the first tape end is fastened to the surface of the at least one permanent magnet in a central region of the longitudinal extent of the rotor.

5. A method for producing a rotor as set forth in claim 1 , said method comprising:
fastening a first tape end of a bandage tape made of a carbon fiber-reinforced plastic (CFRP) or a glass fiber-reinforced plastic (FRP) to a surface of at least one permanent magnet of a plurality of permanent magnets;
winding a first tape section of the bandage tape that extends over at least one half of a longitudinal extent of the rotor spirally around the permanent magnets in a first winding direction, winding a second tape section that extends over the axial extent of the rotor and is wound in a second winding direction opposite to the first winding direction over the first tape section, and winding a third tape section in the first winding direction over the second tape section that does not cover the first tape section; and
welding a second tape end of an outermost tape section of the bandage tape to the second tape section,
wherein the bandage tape is wound around the permanent magnets with a prestress adequate to hold the permanent magnets in place on the rotor.

6. The method of claim 5 , further comprising joining the second tape end to the tape section disposed below the outermost tape section by a welded connection, and pressing the second tape end on the tape section disposed below the outermost tape section by applying an adhesive film tape.

7. The method of claim 6 , further comprising removing the adhesive film tape from the bandage tape after the welded connection between the outermost tape section and the tape section disposed below the outermost tape section has hardened.

8. An electric machine, comprising a rotor which includes a plurality of permanent magnets arranged on an exterior of the rotor; and a bandage tape made of a carbon fiber-reinforced plastic (CFRP) or a glass fiber-reinforced plastic (FRP) and wound around the permanent magnets for fixing the permanent magnets in place, said bandage tape including a first tape end and a second tape end, with the first tape end being fastened to a surface of at least one permanent magnet, said bandage tape being spirally wound around the permanent magnets with a prestress adequate to hold the permanent magnets in place on the rotor, wherein the spirally wound bandage tape comprises a first tape section that extends over at least one half of a longitudinal extent of the rotor and wound in a first winding direction, a second tape section that extends over the axial extent of the rotor and wound in a second winding direction opposite to the first winding direction, and a third tape section wound in the first winding direction and including the second tape end, wherein the second tape end is welded to the tape section disposed below the third tape section and at least two tape sections having opposite winding directions are arranged on top of one another along the longitudinal extent of the rotor.

9. The electric machine of claim 8 , wherein the first tape end is fastened to the surface of the at least one permanent magnet by a bonded connection.

10. The electric machine of claim 9 , wherein the bonded connection comprises at least one adhesive strip to fix the first tape end to the surface of at least one permanent magnet.

11. The electric machine of claim 8 , wherein the first tape end is fastened to the surface of the at least one permanent magnet in a central region of the longitudinal extent of the rotor.

12. The electric machine of claim 8 , constructed in the form of a synchronous machine.

13. The electric machine of claim 8 , constructed in the form of a servomotor.

Assignees

• Siemens Ag

Inventors

• Eckert Rainer
• Kraus Andreas

Classifications

• H02K1/278 Primary

  Surface mounted magnets; Inset magnets · CPC title

• H02K21/14

  with magnets rotating within the armatures · CPC title

• H02K1/2706

  Inner rotors · CPC title

• H02K15/03 Primary

  having permanent magnets · CPC title