pcbsolderingwire
I have been using mounting blocks to connect wires (typically coming from sensors/supply battery) to my PCB.
The problem is, these do not seem to be robust. The wire often gets out of the block, which is not what I normally want to happen.
My guess would be to directly solder the wire to the PCB, but was wondering if anyone has another suggestions.
Two wire DC motors are polarity sensitive so you may want to consider a connector pair (one for the motor leads and the other mate to go on the PC board) that provide a keyed insertion scheme. This will prevent the connector from being joined in the wrong way.
Also when making the PCB design have a component outline on the silkscreen that shows the connector shape so as to help get the connector mounted correctly during board assembly. There are board mount connectors that have alignment pegs on the connector body that will rest in a drill hole on the PCB. This can ensure proper assembly. The optimum connector used will be a through hole mount type so it is ruggedly attached to the board.
For assembling the motor wire harness make up an assembly drawing that can be referenced to ensure the proper connection of the red and black wires to the proper connector pins. Not that the best connector for this application is one with crimp pin contacts that slide into the connector housing.
As to select which connector pair to choose within the above guidelines...it will depend on a number of factors including:
As you consider the above factors it will become obvious why there are so may thousands of different types of connectors out in the market. You may find a plethora of choices that will meet your needs.
This is the kind of stress relief & connection that I would make, how do you like my paint skills? Top notch? Yeah, uhm, the hot glue (green) would also be on the other side if you're pedantic about it.
With the distance (cm) I was talking about, it would look like this: ISH
Best Answer
The problem with those screw terminals as well as soldering directly to the PCB is that any movement or bending of the wires will quickly lead to fatigue failure. A good solution would be to crimp bootlace ferrules on wire ends before screwing them into the terminal block or providing some form of strain relief for wires soldered directly to the PCB. Both of these solutions are good at avoiding wire fatigue and breakage.
You can also try using a bit thicker multistranded wire screwed directly into the terminals (do not tin with solder first as this increases fatigue failure rate).