Lecture 4

Question 1

What is a motor?

Answer 1

A motor is a device consisting of a rotor spinning in a magnetic field produced by permanent magnets or by coils

Question 2

How does a motor work?

Answer 2

1. When current flows, torque generated angular acceleration made.
2. after 180 degree current stops
3. current is reversed.
4. repeat process

Question 3

How does a DC motor work? What two parts enable this process.

Answer 3

The interaction of the fields produces the movement of the shaft/ armature. The two parts which do this are the commutator and the brushes.

Question 4

What are motor windings?

Answer 4

allow for smooth and regular motion.

Question 5

What are the key traits of the stepper motor (2)?

Answer 5

• No need of a feedback loop.
• Half stepping overation.

Question 6

What key components enables stepper motors, what does it do?

Answer 6

H bridge. Controls the flow of current to allow the motor to rotate, stop, and reverse.

Question 7

What is an analog signal?

Answer 7

A signal which includes infinite increments like color or sound level.

Question 8

What is a digital signal?

Answer 8

A discrete or finite measurement, with a limited set of values, due to be represented by a limited number of bytes.

Question 9

What the the challenges of analog systems (2)?

Answer 9

• Noise and interference
• Precision

Question 10

What are the challenges of digital systems(3)?

Answer 10

• Latency
• Power consumption
• Complexity

Question 11

When should you chose an analog system(4)?

Answer 11

• High precision.
• Real-time response.
• When the physical variable is continuous.
• Traditional control systems without a lot of data processing.

Question 12

When should you chose an digital system(3)?

Answer 12

• Flexibility and programmability for changing system requirements.
• Noise immunity and long-distance communication.
• If integrating with computers, MCU’s or any system with digital processing.

Question 13

What is a hybrid system?

Answer 13

A system which uses both analog and digital components to try to cancel out each others drawbacks.

Question 14

What are some applications of hybrid systems(3)?

Answer 14

• communication systems
• control systems
• audio and video equipment

Question 15

What is binary(4)?

Answer 15

• A number system consisting of 0’s and 1’s
• otherwise known as base 2
• 1 = on, 0 = off
• each number is a bit, each 4 is a nibble, an entire group is a word

Question 16

Why is binary important(4)?

Answer 16

• computers use binary to process data
• simplifies the design of processors, memory and data storage
• logic gates in computers use binary
• can represent anything

Question 17

What are some applications of binary(3)?

Answer 17

• computers
• networking
• data storage