Systems, methods, and mechanical designs for inverters for eVTOL aircraft
An electrical propulsion system for a vertical take-off and landing (VTOL) aircraft comprises an electrical motor assembly and an inverter assembly. The inverter assembly comprises a housing, a capacitor assembly, at least one printed circuit board assembly (PCBA), and a plurality of positioning pins. The capacitor assembly comprises a center hole, at least one capacitor, a capacitor housing having at least one busbar, and a plurality of through holes in the capacitor housing. The capacitor assembly and the at least one PCBA are positioned inside the housing. The plurality of positioning pins pass through the through the plurality of through holes of the capacitor housing and the at least one PCBA and are connected to the housing.
1. A printed circuit board assembly (PCBA), comprising:
a contact pad having at least one electrical contact; and
at least one snaking connection configured to connect the contact pad to a printed circuit board, wherein:
the contact pad is configured to deflect relative to a plane of the printed circuit board;
the at least one electrical contact is electrically connected to electronics on the printed circuit board through the at least one snaking connection; and
the contact pad and snaking connection are at least partial cut-outs of the printed circuit board and are located within the printed circuit board.
2. The PCBA structure of claim 1 , wherein:
the printed circuit board comprises at least one substrate layer and one conductive layer; and
the at least one snaking connection is formed by at least one partial cut-out of the at least one substrate layer.
3. The PCBA structure of claim 2 , wherein the partial cut-out does not extend into the at least one conductive layer.
4. The PCBA structure of claim 2 , wherein the partial cut-out of the at least one substrate layer is perpendicular to an instant running direction of the at least one snaking connection.
5. The PCBA structure of claim 1 , wherein:
the contact pad and the at least one snaking connection form a flexible section of the PCBA structure;
each of the at least one snaking connections is configured to deflect relative to the plane of the printed circuit board according to a flex factor, wherein the flex factor is based on an allowable displacement or deflection of the contact pad relative to the plane of the printed circuit board over the length of the flexible section.
6. The PCBA structure of claim 5 , further comprising at least two of the snaking connections, wherein the at least two snaking connections have a same flex factor.
7. The PCBA structure of claim 5 , wherein the flex factor is less than 0.015.
8. The PCBA structure of claim 1 , further comprising a plurality of electrical contacts on the contact pad.
9. A method comprising:
providing at least one PCBA, the PCBA comprising:
a contact pad having at least one electrical contact; and
at least one snaking connection configured to connect the contact pad to a printed circuit board, wherein:
the contact pad is configured to deflect relative to a plane of the printed circuit board;
the at least one electrical contact is electrically connected to electronics on the printed circuit board through the at least one snaking connection; and
the contact pad and snaking connection are at least partial cut-outs of the printed circuit board and are located within the printed circuit board;
stacking, in a direction perpendicular to the plane defined by the PCBA structure, an electrical component on top of the at least one PCBA structure, the electrical component having a second electrical contact; and
connecting the first electrical contact and the second electrical contact.
10. The method of claim 9 , wherein
the printed circuit board comprises at least one substrate layer and one conductive layer; and
the at least one snaking connection is formed by at least one partial cut-out of the at least one substrate layer.
11. The method of claim 10 , wherein the partially cut-out layer of the at least one substrate layer is perpendicular to an instant running direction of the at least one snaking connection.
12. The method of claim 9 , wherein:
the contact pad and the at least one snaking connection form a flexible section of the PCBA structure;
each of the at least one snaking connections is configured to deflect relative to the plane of the printed circuit board according to flex factor, wherein the flex factor is based on an allowable displacement or deflection of the contact pad relative to the plane of the printed circuit board over the length of the flexible section.
13. The method of claim 12 , further comprising at least two of the snaking connections, wherein the at least two snaking connections have a same flex factor.
14. The method of claim 13 , wherein the flex factor is less than 0.015.
15. The method of claim 9 , further comprising providing a plurality electrical contacts on the contact pad.
16. The PCBA structure of claim 1 , wherein the contact pad is configured to deflect relative to a plane of the printed circuit board at least in part due to flexibility provided by the at least one snaking connection.
17. The PCBA structure of claim 1 , wherein a face of the contact pad aligns with a face of the printed circuit board in an undeflected state.