Is there any way to derive the load resitance of an electric motor under a certain mechanical load when it's running, from a specsheet like **broken link removed**? I want to know the electrical resistance....the Ohms value....
The reason is, I'm making a solar powered car and the solar panel produces the most power when it's connected to a motor with a certain resistance. I have one motor for example that, when spinning freely, takes 0.25A at 18V from the solar panel (4.5watts), but when loaded that goes to 0.5A at 16V, (8watts) because the motor's resistance changes. That motor, when messuring its resistance with a simple ohm-meter, of course completely stalled, has about 19 Ohms of resistance, but it's clearly much higher when it's spinning freely at max revs. In this case 18/.25 = 72 Ohms, and when loaded 16/.5= 32 Ohms. (which seems like a good value for the solar panel)
The specs of the solar panel are **broken link removed**.