Cooling of stator by corrugated hose in an electric machine

• US 20040130223A1
• Filed: 10/24/2003
• Published: 07/08/2004
• Est. Priority Date: 01/25/2001
• Status: Active Grant

• Current Assignee: Baumüller Nürnberg GmbH
• Original Assignee: Baumüller Nürnberg GmbH
• Inventors: Nimz, Detlef, Meister, Rudolf
• Granted Patent: US 6,822,352 B2
• Time in Patent Office: Days
• US Class Current: 310/58
• CPC Class Codes: H02K 1/20 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 41/02 Linear motors; Sectional motors
• CPC Class Codes: H02K 5/203 specially adapted for liquids, e.g. cooling jackets

Abstract

A cooled stator for an electric machine including a rotating rotor wherein the stator comprises an electric sheet metal stack and one or more flexible, deformable cooling channels for guiding the flowing cooling medium in a liquid or gas form, reacting with the stacks. The invention is characterized by the one or more cooling channels being formed from one or more flexible corrugated hoses made of metal.

Claims

1. Cooled stator for an electric machine with a rotating rotor, which stator is formed with a magnetic laminated core (1) and comprises one or more flexibly deformable cooling channels, which act on the laminated core (1), for flowing cooling medium in a liquid or gaseous state, characterised in that the one or the plurality of cooling channels is/are formed with one or a plurality of flexible corrugated metal hose (3).

3. Stator according to claim 1 or 2, wherein winding slots (10) are provided at the stator laminated core (1), characterised in that the corrugated hose (3a) is or are laid in the winding slots (10) and are in contact with electrically conducting winding parts.

4. Stator according to any one of the preceding claims, characterised in that the corrugated hose (3, 3a, 3b) is or are laid in the laminated core (1) under tensile stress.

5. Stator according to any one of the preceding claims, with one or a plurality of bore(s) 17 in the laminated core (1) to form the cooling channels, characterised in that the corrugated hose (3, 3b) is or are laid in the bore(s) 17.

6. Stator according to any one of the preceding claims, characterised in that the corrugated hose (3, 3a, 3b) is or are secured to the laminated core (1) by casting with a heat-conductive material.

7. Stator according to claims 5 and 6, characterised in that a plastics material, aluminium, tin, lead, zinc or an alloy with aluminium and/or zinc is used for casting.

8. Stator according to any one of the preceding claims, excepting claim 2, characterised in that the corrugated hose (3) is or are laid parallel to the rotational axis (7), at least in portions (2).

9. Stator according to claim 8, characterised in that the corrugated hose (3) is or are laid and/or bent in the region of stator front sides or any end shields which are to be attached in order to form windings (4) extending in meander-like fashion.

10. Stator according to any one of the preceding claims, excepting claims 1, 8 and 9, characterised by a plurality of corrugated hose (3a, 3b) extending parallel and transversely to the stator longitudinal direction (11) or portions of a single corrugated hose (3a, 3b) extending parallel and transversely to the stator longitudinal direction (11).

11. Stator according to claim 10, characterised by a meander-like path of the single corrugated hose (3b), wherein the transverse portions (8) are connected together by bent portions.

2. Cooled stator for an electric linear motor which is formed with a magnetic laminated core (1) and comprises one or more flexibly deformable cooling channels, which act on the laminated core (1), for flowing cooling medium, characterised in that the one or the plurality of cooling channels is/are formed with one or a plurality of flexible corrugated metal hose (3a, 3b).