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ECET 365 Week 1 Homework Problems 8.9, 8.10, D8.13, D8.14, D8.15 Recent
Problems 8.9, 8.10, D8.13, D8.14, D8.15
8.9) A stepper motor has 24 north teeth and 24 south teeth. What angle change occurs on each step?
If a full step is output every 1 ms (and assuming it doesn’t slip), at what speed does the motor spin?
8.10) Draw a figure similar to figure 8.80 showing how half stepping works.
D8.13) Design an interface for a +24 V, 500 mA geared DC motor. The time constant of the motor is
D8.14) Design an interface for a +12 V, 500 mA bipolar stepper motor. There are 200 steps/revolution.Write the software to spin the motor at 1 rps.
D8.15 An alarm is powered by 120 VAC, and the on/off state of the alarm is controlled by an EM relay. Design the interface between a computer output port and the EM relay. The dropout voltage is 3.5 V, and the coil current needs at least 100 mA. Limit the coil voltage to 6 V. Write three software functions: Alarm_Init, Alarm_On, and Alarm_Off.
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