Hi,
I use the MD10C R3 to control a DC Motor which is installed in an electric car for my little son.
This worked last year perfect.
Since this year it burned often the Q2 Mosfet. I think the Q2 Mosfet is for the flyback during dynamic braking.
Maybe it is due to that my son has getting heavier/older.
Do you have an idea what I can do to avoid this?
-Does help a shunt regulator? If yes, do I need to install in parallel to the battery or in parallel to the motor?
-Do I need the big brother MD20A or MD30A?
Thank you for your help.
Florian
Hello @Flo1988!
As your son is getting heavier the load on the motors is higher so they need more torque and therefore more current. However as this controller has no over current protection this causes the MOSFET to burn. For this reason and the fact that your child will continue to grow, the best option is to upgrade to a more powerful controller. The MD20A can provide 20A continuous, 60A peak and also features over current and temperature protection.
Page 5 on the product
manual.
I hope this helps!
1 Like
@Ms. geraldinebc15 isn’t it also necessary to know the voltage and current ratings of the DC motors used in the electric car? What do you think? Thank you.
Hello @rpiloverbd!
For sure! However, if the motor driver’s nominal current is higher than the motor’s current consumption there is no problem, the issue is if it is the other way around.
As Flo1988 mentioned that the MOSFETs were burned this means that his motors were drawing more current than what the driver could provide, and this could be solved by upgrading his motor driver to one that can provide more current (and overcurrent and temperature protection). Regarding the nominal voltage, both drivers offer the same range so if the MD10C worked for him the MD20A should also work.
However, it is great that you asked this because it is worth noting that it is important to take into account the specifications of the motors he’s using when choosing a motor driver.
Also as his son will keep on growing and adding more load, the motors will, at some point, stall, and it won’t matter if the driver is powerful enough, the motors might not be.
Regards
