ENB205 Lecture Notes - Lecture 2: Computer Engineering, Equivalent Circuit, Terminal Velocity
Document Summary
As soon as the rod starts to move due to the f acting on it, the rod induces a voltage. According to lenz"s law this voltage opposes the flow of current. Once the rod accelerates to a velocity where induced emf. Is equal to input voltage (v), there will be no force on the rod. In a perfect world without friction the rod would continue at this velocity for ever. At start up the rod is stationary, so. Applying a load to the machine, slows the motor down due to fload in opposite direction of the rod motion. As the motor slow down the induced voltage reduces, increasing the current in the rod. (a) Increase in current in the rod provides more force to counter the load: (b) Then the rod travels in steady state but at lower speed. To achieve single polarity (dc) output, commutation is used.
