Cornell is tough. Even tougher for engineering students. There will be days you feel like your the stupidest kid in the program, and you'll wonder if you belong with everyone else. But then you remember that your experience at Cornell shouldn't be shaped by your performance relative to everyone else. Rather, your experience there should be shaped by how much you've saturated yourself in the learning environment. There is no better place to expose yourself to all sorts of knowledge than Cornell.
Back-EMF Motion Feedback. INTRODUCTION. Electromotive force (EMF) refers to the voltage generated by a spinning motor. Measuring this voltage in order to determine the rotational speed of a motor is commonly called Back-EMF since the voltage tends to push-back against the circuit driving current into a motor's windings.
The way I explain it in my training classes is this. An ECM motor maintains a programmed CFM in response to changes in torque. When the sensed torque changes, the RPM of the motor either ramps up or down to maintain the programmed CFM.