STATOR FOR A HIGH-TEMPERATURE ELECTRIC MOTOR AND ELECTRIC MOTOR

• US 20140292115A1
• Filed: 03/23/2014
• Published: 10/02/2014
• Est. Priority Date: 03/27/2013
• Status: Active Grant

• Current Assignee: Maxon Motor AG (Karl-Walter Braun, PhD)
• Original Assignee: Maxon Motor AG (Karl-Walter Braun, PhD)
• Inventors: BRZUSKA, Yaaqub, STUBICAR, Kornelia, ASCHWANDEN, Pia, HNNI, Tobias, HAGE, Bernd, FRDERER, Bernd
• Granted Patent: US 9,660,495 B2
• Time in Patent Office: Days
• US Class Current: 310/45
• CPC Class Codes: H02K 2203/09 Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32
• CPC Class Codes: H02K 3/38 around winding heads, equalising connectors, or connections thereto

Abstract

A stator for an electric motor for use at very high temperatures of up to 550° C. is provided, comprising a stator winding with an axis and with several winding wire ends which are passed out at a front end of the stator winding. The stator further comprises a stator winding interconnection with several ring conductors which are arranged at the front end of the stator winding coaxially to same and are axially spaced apart from each other. The ring conductors serve the electrical contacting of the winding wire ends. It is provided that an electrically insulating distance ring is respectively provided between axially successive ring conductors, wherein the ring conductors and the distance rings are alternately stacked.

Claims

1. A stator for an electric motor, in particular for a high-temperature electric motor, comprising:

a stator winding with an axis and with several winding wire ends which are passed out at a front end of the stator winding, wherein the stator comprises a stator winding interconnection with several ring conductors which are arranged at the front end of the stator winding coaxially to same and are axially spaced apart from each other, wherein the ring conductors serve the electrical contacting of the winding wire ends, and wherein an electrically insulating distance ring is respectively provided between axially successive ring conductors, and wherein the ring conductors and the distance rings are alternately stacked.

2. The stator according to claim 1, wherein the distance rings are made of ceramics.

3. The stator according to claim 1, wherein the winding wire ends, the ring conductors and the distance rings are encapsulated by an insulating, curing encapsulating material.

4. The stator according to claim 3, wherein the encapsulating material is radially limited by a ring sleeve, wherein the ring sleeve surrounds the ring conductors and the distance rings.

5. The stator according to claim 1, wherein the ring conductors each have at least one radially projecting lug for electrically contacting one of the winding wire ends.

6. The stator according to claim 5, wherein the ring conductors each have two lugs for electrically contacting two winding wire ends, wherein the two lugs of a ring conductor are arranged at different positions spaced apart from each other in the circumferential direction.

7. The stator according to claim 5, wherein the lugs each have a recess substantially extending in the circumferential direction or tangentially, wherein associated winding wire ends and recesses are arranged at the same radial distance to the axis, and wherein the winding wire ends are passed through the recesses and bent to the associated lug.

8. The stator according to claim 5, wherein the lugs project radially outwardly.

9. The stator according to claim 5, wherein the winding wire ends are welded to associated lugs.

10. The stator according to claim 1, wherein at least two of the ring conductors have an axially bent terminal lug for the external electrical contacting.

11. The stator according to claim 1, wherein the stator comprises a winding support ring, wherein the winding support ring is arranged between the stator winding and the stacked ring conductors and includes several bores through which the winding wire ends are passed.

12. The stator according to claim 11, wherein the stator winding is supported in the radial direction by a supporting sleeve arranged inside the stator winding, wherein the supporting sleeve is inserted into an accommodating recess of the winding support ring.

13. The stator according to claim 1, wherein the stator winding has three phase windings which are interconnected in a delta connection.

14. An electric motor comprising a stator according to claim 1.