Axial field rotary energy device with PCB stator panel having thermally conductive layer

1. An axial field rotary energy device, comprising:

rotors having an axis of rotation, and each rotor comprises a magnet;

a stator assembly located axially between the rotors, the stator assembly comprises a plurality of printed circuit board (PCB) panels, each PCB panel comprises a plurality of layers, each layer comprises a plurality of coils, and at least one outer portion of the stator assembly comprises an external thermally conductive layer that extends from an inner diameter portion to an outer diameter portion of the stator assembly;

both major outer sides of the stator assembly comprise respective external thermally conductive layers that comprise radial thermal traces that are thermally coupled to each other; and wherein

the external thermally conductive layers are galvanically coupled to a machine housing of the device and configured to provide electrical grounding for the stator assembly.

2. The device of claim 1 , wherein at least some of the radial thermal traces comprise discontinuities that can disrupt circulation of eddy currents.

3. An axial field rotary energy device, comprising:

rotors having an axis of rotation, and each rotor comprises a magnet; and

a stator assembly located axially between the rotors, the stator assembly comprises a plurality of printed circuit board (PCB) panels, each PCB panel comprises a plurality of electrically conductive layers, each electrically conductive layer comprises a plurality of coils, and at least one outer portion of the stator assembly comprises an external thermally conductive layer that is separate from the electrically conductive layers and extends continuously in a radial direction from an inner diameter portion to an outer diameter portion of the stator assembly.

4. The device of claim 3 , wherein both major outer sides of the stator assembly comprise respective external thermally conductive layers that are thermally coupled to each other.

5. The device of claim 4 , wherein the external thermally conductive layers are thermally coupled with a plurality of vias.

6. The device of claim 2 , wherein the thermally conductive traces have a non-linear pattern.

7. The device of claim 2 , wherein the thermally conductive traces have a serrated pattern.

8. The device of claim 5 , wherein the vias are located adjacent the inner and outer diameter portions.

9. The device of claim 4 , wherein at least one surface of each external thermally conductive layer comprises a treatment to increase emissivity thereof.

10. The device of claim 3 , further comprising heat sinks comprising thermally conductive material coupled adjacent at least one of the inner and outer diameter portions.

11. The device of claim 10 , wherein each heat sink comprises discrete heat sink segments.

12. The device of claim 10 , wherein each heat sink comprises fingers that extend from a plane of the heat sink.

13. The device of claim 12 , wherein some of the fingers are oriented at a first angle and other ones of the fingers are oriented at a second angle that differs from the first angle.

14. The device of claim 3 , further comprising an internal thermally conductive layer located inside the stator assembly.

15. The device of claim 14 , wherein the internal thermally conductive layer is thermally coupled to the external thermally conductive layer with vias.

16. The device of claim 15 , wherein the vias are located adjacent at least one of the inner and outer diameter portions.

17. The device of claim 14 , further comprising heat sinks comprising thermally conductive material coupled adjacent to at least one of the inner and outer diameter portions.

18. The device of claim 17 , wherein each heat sink comprises discrete heat sink segments.

19. The device of claim 18 , wherein each heat sink comprises fingers that extend from a plane of the heat sink.

20. The device of claim 19 , wherein some of the fingers are oriented at a first angle and other ones of the fingers are oriented at a second angle that differs from the first angle.

21. The device of claim 3 , further comprising a plurality of internal thermally conductive layers.

22. The device of claim 21 , wherein the internal thermally conductive layers are evenly spaced apart from each other.

23. The device of claim 21 , wherein the internal thermally conductive layers are unevenly spaced apart from each other.

24. The device of claim 3 , wherein the external thermally conductive layer comprises radial thermal traces that are thermally coupled at ends thereof to a substantially continuous area of thermally conductive material adjacent to an outer edge of the PCB.

25. The device of claim 24 , wherein the substantially continuous area of thermally conductive material is adjacent to an inner edge of the PCB.

26. The device of claim 24 , further comprising a second substantially continuous area of thermally conductive material adjacent to an inner edge of the PCB.

27. The device of claim 26 , wherein the external thermally conductive layer is thermally coupled to a second external thermally conductive layer with vias that are thermally conductive.

28. The device of claim 24 , wherein the external thermally conductive layer comprises radial thermal traces that comprise a linear pattern.

29. The device of claim 24 , wherein the external thermally conductive layer comprises radial thermal traces that comprise a non-linear pattern.

30. The device of claim 24 , wherein the external thermally conductive layer comprises radial thermal traces that comprise a serrated pattern.

31. The device of claim 24 , wherein at least one pair of the radial thermal traces is not connected to any other thermal traces or substantially continuous area of thermally conductive material, and the at least one pair of radial thermal traces is connected adjacent to the inner diameter portion of the stator assembly and is further connected to a voltage sensor of a motor monitoring system.