Version 1 (modified by TonyB, 6 years ago) (diff)


Standard Servo Power Connector

I thought about using ComboD connectors, but the cost would be too much (~$10-$20 per motor with metal hood). After much research, I've settled on using TE's Universal Mate-N-Lok connectors. They are extremely affordable (especially if you buy the cut-tape contacts from Digikey), can handle up to 19A, are easy to crimp, come with locking tabs, and are readily available. They are really ugly, but I beautify them by chopping off the super-ugly bits.


1Motor Phase U
2Motor Phase V
3Motor Phase W
4Motor Frame Ground

Not all motors have a frame ground, so sometimes it's not connected.

Brush motors use pins 1 and 2, and 4 if there is a frame ground.

I always define positive movement to be clockwise when you are facing the motor.

Genders and Part Numbers

IMPORTANT NOTE: Universal Mate-N-Lok pins are available with tin or gold finishes. You should not mix the finishes; use only gold or only tin on all your contacts. Tin is cheaper and works fine in most cases.


Other Power Connectors

My favorite is the ComboD:

  • Some models from Positronics can handle 100A
  • You can choose solder or crimp pins
  • You can choose from a wide variety of plastic and metal backshells
  • They are available from many different manufacturers

I was also very impressed by the Molex Micro-Fit Sr, which can handle up to 50A. On the other hand, the pin remover is really expensive (>$70), I don't need 50A, and they're a lot more expensive than my chosen UMNL connectors.