LIQUID COOLED HIGH EFFICIENCY PERMANENT MAGNET MACHINE WITH IN SLOT GLYCOL COOLING

• US 20140015347A1
• Filed: 07/13/2012
• Published: 01/16/2014
• Est. Priority Date: 07/13/2012
• Status: Active Grant

• Current Assignee: LC Advanced Motor Technology Corporation
• Original Assignee: LCDrives Corp.
• Inventors: Marvin, Russel Hugh, Johnson, Thomas R.
• Granted Patent: US 10,312,760 B2
• Time in Patent Office: Days
• US Class Current: 310/43
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 3/30 Windings characterised by the insulating material
• CPC Class Codes: H02K 9/197 in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
• CPC Class Codes: H02K 9/227 Heat sinks

Abstract

A permanent magnet motor, generator or the like that is liquid cooled using glycol or similar fluid with the means defining cooling passageways disposed directly in the winding slots of the stator between and in engagement with the windings and stator laminations.

Claims

1. A rotary electric machine comprising a stator having a circumaxially spaced series of axially extending teeth defining a similar series of circumaxially spaced winding slots therebetween, a plurality of stator windings at least partially disposed respectively in the slots, means defining a plurality of elongated coolant passageways disposed respectively in the slots between and in general engagement with the surfaces of the windings and the teeth.

2. A rotary electric machine as set forth in claim 1 and including a manifold interconnecting the coolant passageways at one end and supplying at least partially electrically conductive coolant to the passageways, and means defining a series of passageways communicating with the coolant passageways and serving to directly interconnect the same and thus provide cooling loops confined entirely within the slots for the flow of coolant in one and an opposite direction to and from the manifold.

3. A rotary electric machine as set forth in claim 1 wherein the coolant is a mixture of ethylene glycol and water.

4. A rotary electric machine as set forth in claim 1 wherein dual parallel coolant loops are provided for each stator slot, and wherein independent manifold and coolant supply sources are provided for the loops.

5. A rotary electric machine as set forth in claim 1 wherein the means defining the coolant passageways is of metallic construction.

6. A rotary electric machine as set forth in claim 5 wherein the means defining the coolant passageways is at least in part aluminum.

7. A rotary electric machine as set forth in claim 5 wherein the construction employs soldering.

8. A rotary electric machine as set forth in claim 5 wherein the construction employs brazing.

9. A rotary electric machine as set forth in claim 7 wherein the brazing filler material is added in sheet form.

10. A rotary electric machine as set forth in claim 8 wherein the brazing filler material is added in paste form.

11. A rotary electric machine as set forth in claim 5 wherein the construction is at least in part extruded aluminum.

12. A rotary electric machine as set forth in claim 5 wherein casting is employed in making at least some of the passageways.

13. A rotary electric machine as set forth in claim 1 wherein the windings are of the concentrated type.

14. A rotary electric machine as set forth in claim 1 wherein each winding is provided in two distinct sections.

15. A rotary electric machine as set forth in claim 1 wherein the rotor is of the tab pole type.

16. A rotary electrical machine as set forth in claim 1 wherein the gaps between the means defining the coolant passageways and the windings are filled with a molded thermal plastic material which is both electrically insulating and thermally conductive.

17. A rotary electrical machine as set forth in claim 16 wherein the gaps are filled with a compound at least partially consisting of Polyphenylene Sulfide.

18. A rotary electric machine as set forth in claim 16 wherein the gaps are filled with a compound consisting at least partially of a Liquid Crystal Polymer.

19. A rotary electrical machine as set forth in claim 16 wherein the insulation has an electrical resistivity greater than 1000 Ohm cm.

20. A rotary electrical machine as set forth in claim 16 wherein the insulation has a thermal conductivity greater than 1 W/mK.