The three-phase high current (30A~40A) of the motor is connected through the PCB, and the heat dissipation hole blind hole problem

FantasyTG

The three-phase high current (30A~40A) of the motor is connected through the PCB, and the heat dissipation hole blind hole problem [Copy link]

Make a four-layer board with 2oz. Because the board shape is fixed, U, V, W and the center line are each one layer.

The narrowest line width is 6.8mm. Due to heat dissipation issues, the four layers are routed separately, and heat dissipation holes of 1.8mm are made in the non-overlapping parts (the larger the hole, the better).

The board is too small and can only be made into blind holes. There is no space for through holes, and the upper and lower layers must be bare copper.
Due to the difficulty in production, the heat dissipation blind holes can only be opened to 0.3mm.

The white circle is used for blind hole heat dissipation

If you don't want to make a blind hole, what's a good way?

FantasyTG

Without drilling holes, the copper thickness can only be increased

Blind vias are twice as expensive as through vias

FantasyTG

The attached picture shows the wiring distance. It is best not to pass large current through the PCB. However, it is a customer requirement and I am helpless.

Online search for solutions to heat dissipation problems without drilling holes