ENME 351 – University of Maryland, - Electronics & Instrumentation II: Department of Mechanical Engineering. Problems & Solutions.

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ENME 351 – University of Maryland, - Electronics & Instrumentation II: Department of Mechanical Engineering. Problems & Solutions. Problem #1 (4 points) For each of the motor driver circuits below... , answer the following questions. The nominal supply voltage Vmotor = 12 V, the motor resistance Rm = 115 , the motor torque constant KT = 6.61 mN-m/A, and the motor speed constant Ke = 0.692 V/krpm (Faulhaber Series 1516 012S motor). The transistors are each 2N7000 series. Use the typical values and the conditions that most closely approximate each case. a) Is the transistor ON or OFF? If the transistor is ON, answer parts (b) through (d). b) What is the motor current? c) What is the voltage drop across the motor? d) If the motor is experiencing a load torque of 0.65 mN-m, what is the speed in rpm? Problem #2 (2 points) The rotor inductance for the Faulhaber Series 1516 012S motor is 900 μH. If the current through a transistor switch changes at a rate of 1 A/μsec when switched off, what is the voltage generated across the rotor inductance? As an engineer, does this voltage level cause you to be alarmed? If so, what can be done to prevent potential damage to the circuit? [Show More]

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