METHOD FOR SOLDERING A STATOR TO A COOLER, AND STATOR COMPRISING A SOLDER CONNECTION TO THE STATOR SUPPORT

• US 20150303778A1
• Filed: 11/13/2013
• Published: 10/22/2015
• Est. Priority Date: 11/22/2012
• Status: Active Grant

• Current Assignee: Compact Dynamics GmbH (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Compact Dynamics GmbH (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Sontheim, Johann, Menhart, Michael
• Granted Patent: US 9,356,495 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B23K 1/0016 Brazing of electronic components
• CPC Class Codes: B23K 1/002 Soldering by means of induction heating
• CPC Class Codes: B23K 2101/36 Electric or electronic devices
• CPC Class Codes: B23K 31/02 relating to soldering or welding dip or wave soldering in the manufacture of printed circuits H05K3/34
• CPC Class Codes: C25D 7/00 Electroplating characterised by the article coated
• CPC Class Codes: H02K 15/00 Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
• CPC Class Codes: H02K 15/02 of stator or rotor bodies
• CPC Class Codes: H02K 5/203 specially adapted for liquids, e.g. cooling jackets

Abstract

A method for soldering a stator of an electric machine to a cooler is described. Firstly, the stator and/or the cooler is coated, at least partially, with a layer of solder. Then, the stator is brought together with the cooler such that the layer of solder is between the stator and the cooler. Finally, the cooler is heated to the melt temperature of the layer of solder in order to produce a solder connection between the stator and the cooler. The cooler can also act as support. Furthermore, a stator for an electric machine, comprising a stator support and a solder connection between the stator and the stator support is described.

Claims

1. Method for soldering a stator (10) of an electric machine to a cooler (30) with the steps:

coating of the stator (10) and/or the cooler (30), at least partially, with a layer of solder (20, 40);

bringing together of the stator (10) with the cooler (30) such that the layer of solder (20, 40) is between the stator (10) and the cooler (30); and

heating of the cooler (30) to the melt temperature of the layer of solder (20, 40), in order to produce a solder connection (50) between the stator (10) and the cooler (30).

2. Method according to claim 1, wherein the solder material contains tin.

3. Method according to claim 2, wherein the coating step is achieved by electroplating the stator (10) and/or the cooler (30) with tin.

4. Method according to one of the preceding claims, wherein the cooler (30) also acts as support.

5. Method according to one of the preceding claims, wherein the cooler (30) is passed through by at least one fluid channel (32).

6. Method according to claim 5, wherein in the step of heating the cooler (30) is heated by a heat transfer medium flowing through the fluid channel (32).

7. Method according to claim 5, wherein the step of heating comprises the steps:

pouring of a high-boiling liquid into the fluid channel (32);

inductive heating of the cooler (30) on its side facing away from the stator (10) up to evaporation of the boiling liquid; and

condensing of the boiling liquid in the fluid channel, in order to heat the layer of solder (20, 40) to its melt temperature.

8. Method according to claim 7, wherein an internal pressure of the fluid channel (32) is limited by a pressure relief valve.

9. Method according to one of the preceding claims, wherein the electric machine is an external rotor machine, and in the step of coating an outer circumferential surface of the cooler (30) and/or an inner circumferential surface of the stator (10) is coated, at least partially;

or wherein the electric machine is an internal rotor machine, and in the step of coating an outer circumferential surface of the stator (10) and/or an inner circumferential surface of the cooler (30) is coated, at least partially.

10. Stator (10) for an electric machine with

a stator support (30);

and

a solder connection (50) between the stator (10) and the stator support (30), wherein the solder connection (50) is produced according to the method of one of the preceding claims.

11. Stator (10) according to claim 10, wherein the solder connection (50) contains tin.

12. Stator (10) according to one of claim 10 or 11, wherein the stator support (30) contains steel, and/or the stator (10) contains sheet moulding composite (SMC) material.

13. Stator (10) according to one of claims 10 to 12, wherein the stator support (30) also acts as cooler.

14. Stator (10) according to claim 13, wherein the stator support (30) is passed through by at least one fluid channel (32).

15. Stator (10) according to claim 14, wherein the fluid channel (32) is arranged coaxially to the central longitudinal axis of the stator support (30).

16. Stator (10) according to claim 14, wherein the fluid channel (32) is arranged in the form of a spiral or helically around a central longitudinal axis of the stator support (30).

17. Electric machine with a stator (10) according to one of the claims 10 to 16.