Dual Motor Shield for 12V DC motor – 15A starting current

Other Hardware Motors, Mechanics, Power and CNC
1

Hi guys

I’m trying to figure out, which motor shield should I get for my project.
I want to move 2 axis solar tracker with Arduino.

Here is what I got:
2 axis solar tracker with 2x 12V 4A DC motor (15A starting current)
Datasheet for motor: - Motor Nr. 111.3763.20.00
http://docs-europe.electrocomponents.com/webdocs/0093/0900766b800932a5.pdf
Arduino Uno/Mega

Problem is, that most arduino motor shields have max 4A peak current, but my motor has 15 A starting current.

Which motor shield/driver do you recommend?

I found this one:

and this:

Any suggestions appreciated. Thanks

Martin

2

Odd datasheet, by "starting current" they mean "stall current". 4A is the full load
current at nominal full power.

In general you don't need to provide the full stall current, especially if you ramp up
speed with PWM. Expect the power supply voltage to dip at start up if it can't
provide full stall current, this is to be expected (not every power supply can deal
gracefully with this though).

For more than 1.5A you have to go to discrete MOSFET bridges (see note below though)
as single chip bridges cannot carry the current without overheating.

There are what look like single-chip H-bridges rated at 20A or more, but they
are actually several MOSFETs and a control chip mounted in a single package,
such as this:

3

Hi Mark,

thank you for your explanation, really appreciate that.

Regards Martin