View Full Version : [Question(s)] How to choose the correct size motor controller

07-31-2010, 04:54 PM
I am going to start working on a robot tank project with my kids. We plan to drive the tracks with 2 car wiper motors. Specifically these from a Halloween hobby site:

12 VDC has high and low speeds
High Speed @ 12V: 53 r.p.m.
Low Speed @ 12V: 38 r.p.m.
High Speed @ 5V: 21 r.p.m.
Low Speed @ 5V: 15 r.p.m.
Working Torque - 3.98 foot pounds (5.4 N m)
Static Torque - 13.27 foot pounds (18 N m)
Full Load: 2000mA @ 12VDC, 1080mA @ 5VDC
No Load: 1020mA @ 12VDC, 780mA @ 5VDC

I am a C# developer, so I thought phidgets made a lot of sense for me. I found the Phidgets Servo 1-Motor Controller and the BaneBots Motor Controller (9A peak).

Will all these parts work well together? I think I read that the servo controller and motor controller work fine together, I just wonder if the motor controller is ok with this motor and a basic car battery? I plan to just start out with a 12 volt car battery, and maybe bump up to 24 volts down the road.

08-02-2010, 12:08 PM
You said 9A for the motor controller? It is always best to have a motor controller that can supply over the stall current. "Iv burned out many motor controllers from drawing to many amps :)" Other than that the setup is perfect.
The http://banebots.com/pc/ELECTRONICS/BB-1245 has a 45A peak but is a little more expensive.

08-02-2010, 09:18 PM
Thanks for the reply. That is what is confusing me. Is the motor 9amps? It says:
Full Load: 2000mA @ 12VDC, 1080mA @ 5VDC
No Load: 1020mA @ 12VDC, 780mA @ 5VDC

I assumed the maximum amps was 2, am I missing something? I don't want to burn anything up, but I don't want to get anything bigger than I need.

Thanks again for helping me out :D

08-02-2010, 10:09 PM
Oh geez I'm embarrassed. :) It is two amps you where right. I miss read the number and thought it said 20,000 no 2,000. You should be just fine with that motor controller. The 9A one that is.

08-03-2010, 12:29 AM
Oh good. I am trying to learn all this stuff and I thought maybe I was way off base :veryhappy:

Thanks for your help