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ECET 340 WEEK 7 HOMEWORK 7
1.1.The movable part of the solenoid is the: 2 points
2.2.Why is the 6N139 optoisolator used in the interfaces to devices such as large motors? 2 points
3.3.Calculate the number of steps per revolution for a stepper motor with a step angle of 7.5°. 2 points
4.4.How is stepper motor speed controlled? State any two ways a program can do this. 2 points
5.5.For this problem, you should look at Figure 5A on the next page as a physical example of a stepper motor.It is an example of a stepper motor with four (4) magnetic windings which are connected via an interface circuit to the HCS12 Port T pins 4, 5, 6, & 7, with an armature (rotor) that has 12 poles (combined number of North and South magnetic poles).