I've done some research on brushless DC motor and have a few questions what would happen when a constant current is sent to a DC motor.
From my understanding, the current is directly related to the torque that the motor supplies, while the voltage would relate to the RPM. My question is, what would happen when you try to keep the current supplied constant, regardless of the load/rpm.
For example, let's say you have a weight attached to the shaft of the motor, like in this picture:
You set current to be sent to the motor so that the torque applied is 10 in-lbs without any load. In this scenario, this current doesn't change. You attach a weight to the end of the pulley. What happens when the torque from the weight/load is 5, 10, and 15 in-lbs.
I assume, in the 5 in-lb scenario, the motor pull the weight up, at 10 in-lbs the motor would stall, and at 15 in-lbs, the weight would drop and it would actually be acting as a generator.
Now, I'm obviously ignoring the voltage and back-emf in this scenario. How would they play a role? Without any voltage, there won't be any current running through it, so there's no torque applied. But beyond that, would the voltage only affect the acceleration?
Sorry if this question has already been answered, but most of what I found related to a constant NET torque, not a constant applied torque from the generator.