Chapter 2 Actuators and Drive Systems - MIT OpenCourseWare
constant given by eq.(1). This voltage E is called the back emf (electro-motive force) generated at the air gap, and the proportionality constant is often called the back emf constant. Note that, based on eq.(1), the unit of the torque constant is Nm/A in the metric system, whereas the one of the back emf constant is V/rad/s based on eq.(2).
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