LIQUID COOLED HIGH EFFICIENCY PERMANENT MAGNET MACHINE WITH GLYCOL COOLING

• US 20140015351A1
• 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 10,348,146 B2
• Time in Patent Office: Days
• US Class Current: 310/54
• CPC Class Codes: H02K 2203/06 Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
• CPC Class Codes: H02K 2213/06 Machines characterised by the presence of fail safe, back up, redundant or other similar emergency arrangements
• CPC Class Codes: H02K 2213/09 Machines characterised by the presence of elements which are subject to variation, e.g. adjustable bearings, reconfigurable windings, variable pitch ventilators
• CPC Class Codes: H02K 2213/12 Machines characterised by the modularity of some components
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles
• CPC Class Codes: H02K 9/16 wherein the cooling medium circulates through ducts or tubes within the casing
• 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 cooling applied directly in the winding slots of the stator and in self contained loops such that no adverse loops are formed.

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, 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.

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

3. 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.

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

5. A rotary electric machine as set forth in claim 4 wherein the means defining the coolant passageways is at least in part aluminum.

6. A rotary electric machine as set forth in claim 4 wherein the construction employs soldering.

7. A rotary electric machine as set forth in claim 4 wherein the construction employs brazing.

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

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

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

11. A rotary electric machine as set forth in claim 4 wherein casting is employed in making at least some of the passageways.

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

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

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

15. A rotary electric machine comprising a stator and rotor wherein said stator is liquid cooled with at least two independent liquid paths which can be operated with the fluid circulating through only a subset of the paths.

16. 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, each slot having at least one coolant passageway flow direction away from the manifold and at least one coolant passageway flow direction toward manifold.

17. A rotary electric machine as set forth in claim 16 wherein each slot has at least two coolant passageways with fluid flowing away from manifold and in each slot has at least two coolant passageways with fluid flowing toward the manifold.

18. A rotary machine set forth in claim 16 wherein the manifold is constructed such that the fluid in the coolant passageways flows in parallel.

19. A rotary electric machine as set forth in claim 16 wherein the coolant is a mixture of ethylene glycol and water.

20. A rotary electric machine as set forth in claim 16 wherein the means defining the coolant passageways is of metallic construction.