Electronic package for electrical machine
View Patent ↗An electronic package for an electrical machine preferably a rotary current generator includes a slip ring end (SRE) frame defining one end of a housing configured for mounting a rotor therein so as to be rotatable; a plurality of negative diodes dispersed in an angular fashion in the SRE frame acting as a negative heat sink; a plurality of positive diodes mounted on a separate electrically conductive plate located above a location of the plurality of negative diodes, the plate being configured as a positive heat sink having corresponding holes such that leads extending from each negative diode protrude directly therethrough and openings formed in the positive heat sink to engage a body of each positive diode; and a non-conductive separator fitted over a series of bosses that space the positive heat sink above a top surface defining the negative heat sink, the separator configured to electrically insulate the positive heat sink and negative heat sink from one another, wherein waste heat from the positive and negative heats sinks is to be carried off via vents configured in each and radially outwardly across surfaces defining each.
1. An electronic package for an electrical machine preferably a rotary current generator, comprising:
a slip ring end (SRE) frame defining one end of a housing configured for mounting a rotor therein so as to be rotatable;
a plurality of negative diodes dispersed in an angular fashion in the SRE frame acting as a negative heat sink;
a plurality of positive diodes mounted on a separate electrically conductive plate located above a location of the plurality of negative diodes, the plate being configured as a positive heat sink having corresponding holes such that leads extending from each negative diode protrude directly therethrough and openings formed in the positive heat sink to engage a body of each positive diode;
a non-conductive separator fitted over a series of bosses that space the positive heat sink above a top surface defining the negative heat sink, the separator configured to electrically insulate the positive heat sink and negative heat sink from one another;
a terminal assembly configured to make appropriate electrical connections between the positive and negative diodes, stator phase leads, and a regulator assembly; and
the regulator assembly is operably fastened to the SRE frame at a plurality of locations, the regulator assembly electrically connects to the positive heat sink, a stator phase terminal extending from the terminal assembly, SRE frame, and a brush holder assembly;
wherein waste heat from the positive and negative heat sinks is convectively carried off through vents configured in each of the positive and negative heats sinks and radially outwardly across both surfaces defining each of the positive and negative heat sinks.
2. The package of claim 1 , wherein the openings in the positive heat sink are elongated cylinder walls.
3. The package of claim 1 , further comprising a cover that extends across to shield the electronic package, the cover attaches to the SRE frame.
4. The package of claim 1 , wherein a plurality of vents are concentrically disposed radially inward and outward of the plurality of negative diodes forming an arc therebetween.
5. The package of claim 4 , wherein radial slots are formed in the positive heat sink, the radial slots being substantially aligned with the plurality of vents disposed radially inward of the plurality of negative diodes.
6. The package of claim 5 , wherein the radial slots are formed when fins are punched out of the plate defining the positive heat sink such that each fin corresponds to a slot aligned therewith.
7. The package of claim 6 , wherein the positive heat sink being spaced from the SRE frame allows air to flow axially down through the slots proximate a finned area defined by the fins on the positive heat sink and also allowing flow radially across both faces defining the SRE frame and the plate before entering an SRE frame inlet defined by corresponding vents.
8. The package of claim 7 , wherein the fan is disposed proximate a slip ring end of the machine and configured to draw air into the SRE frame toward the electronic package residing thereon.
9. The package of claim 8 , wherein the fan scrubs air directly across the face of the SRE frame for cooling thereof.
10. The package of claim 1 , wherein said corresponding holes having corresponding leads from the negative diodes extending therethrough protrude directly through the corresponding holes and are each aligned with a respective conductor extending from the terminal assembly for electrical connection therewith.
11. The package of claim 1 , wherein each opening is preferably configured to at least one of allow press-fit assembly of a corresponding positive diode therein and increase a surface area of contact with the corresponding diode to increase heat conduction therefrom.
12. The package of claim 1 , the separator is configured as a phase lead insulator insulating stator wires extending through the SRE frame 2 which is at ground potential and electrically connected to a corresponding conductor extending from the terminal assembly.
13. The package of claim 1 , wherein the terminal assembly is preferably configured as an arc substantially matching a pattern of at least one the disposed plurality of negative diodes, plurality of positive diodes and configuration of the positive heat sink.
14. The package of claim 13 , wherein the terminal assembly, positive heat sink, separator, and SRE frame are clamped together via fasteners that pilot through cylindrical walls configured in the terminal assembly securing the resulting assembly.
15. The package of claim 14 , wherein each of the cylindrical walls provides electrical isolation from the positive heat sink for a corresponding fastener extending therethrough.
16. The package of claim 14 , wherein the spacing of each fastener includes two diodes therebetween.
17. The package of claim 1 , wherein a positive battery (B+) stud is operably connected to the positive heat sink.
18. The package of claim 17 , wherein the regulator assembly is electrically and structurally connected to the positive heat sink that is at a B+ voltage potential by placing a ring terminal formed in a lead frame defining the regulator assembly over the B+ stud.
19. The package of claim 18 , wherein a metallic spacer is disposed over the B+ stud on top of the regulator ring terminal such that when an external battery cable is operably attached to the B+ stud, the rectifier assembly is in compression from tension developed in the B+ stud when an external nut is fastened on the B+ stud.
20. The package of claim 1 , wherein the regulator assembly is electrically connected to one of the stator phase windings via the terminal assembly.
21. The package of claim 20 , wherein the terminal assembly includes a first conductor electrically connected to the one of the stator phase windings via a corresponding lead and a second conductor having a soldered connection between a tab extending from the terminal assembly and a corresponding receptacle of the regulator assembly.
22. The package of claim 1 , wherein the positive heat sink is configured with shear formed fins and concentric walls around the positive diodes that both yield high surface area for heat dissipation therefrom, each of the formed concentric walls is configured to at least one of increase plate stiffness and retain a positive diode.
23. The package of claim 1 , further comprising:
a B+ stud defined by a head at one end and threaded on the other end, the B+ stud protrudes through the positive heat sink anchored by the head resting against a surface defining the positive heat sink;
a metallic spacer disposed over the B+ stud such that when an external battery cable is operably attached to the B+ stud, the B+ stud is in tension and the spacer is in compression when an external nut is fastened on the B+ stud; and
knurling on at least one of the B+ stud and an inside diameter surface of the spacer such that when the metallic spacer is disposed on the B+ stud, the stud and spacer are in press-fit engagement.
24. The package of claim 23 , wherein the regulator assembly is electrically and structurally connected to the positive heat sink that is at a B+ voltage potential by placing a ring terminal formed in a lead frame defining the regulator assembly over the B+ stud.