I'm aware that you can power a wound motor (DC or even stepper) if you limit the current inside the coils. You cannot just apply a higher DC voltage to them.
I'm using a DRV8871 to control a VN-C1 pump (that comes with a 12V DC motor).
At 12V the pump will draw slightly more than 800 mA. My circuit is powered by a 4S LiPo battery that reaches 16.8V when fully charged - and that is 40% more than the nominal voltage of the motor.
I'm going to set the current limit of the DRV8871 to 800 mA (or even less) and connect the Vmotor directly to the battery pack. I'm trying to avoid the use of a "large" current (> 1A) step-down converter.
I wasn't able to find a proper datasheet for the VN-C1 pump and every request sent to several vendors was ignored. I'm pretty sure the windings can withstand such a voltage and I might set up a long-running test and a stress-test to find out the real limits.
But my question is related to certifications (CE marking): I'm afraid using a device outside its operating range won't be accepted.
Question: can I "safely" (in the certification meaning) operate a DC motor at 40% higher voltage than nominal?