13

I'm building a project with Raspberry Pi and some other electronics driving the LEGO Power Functions M-Motor (8883) and I need to know how much current those motors draw under load.

Has anyone done tests and put together a spec sheet for these motor's electronic characteristics?

This is my first post here on Bricks.SE! Hopefully sharing this is welcome.

Robin
  • 391
  • 2
  • 9

1 Answers1

16

YES! Philippe Hurbain (Philo) has put together a great and very detailed write-up on those and many other LEGO 9V electric motors.

You can find it here: LEGO 9V Technic Motors compared characteristics

Your current draw for that specific motor @ 9V is:

No load:              65mA  
Loaded (3.6 N.cm):    310mA  
Loaded (6.0 N.cm):    480mA  
Stalled (11 N.cm):    850mA

I was about to ask this very question when a friend pointed me to this write-up.
Hopefully someone else will find it as useful as I did.

Robin
  • 391
  • 2
  • 9
  • 2
    I found his web site very helpful when I had do find a fitting H-bridge to control LEGO motors with my arduino – MrSmith42 Dec 26 '15 at 14:44
  • Can you share the make & model of the H-bridge that you used and where you got it? I have a similar project involving littleBits, See here for details. – EJ Mak Jan 15 '21 at 18:53