lec 7

Question 1

what is a stepper motor

Answer 1

brushless motor which divides one full shaft rotation into a number of
predefined steps

Question 2

what principle does stepper motors work on

Answer 2

electromagnetism

Question 3

how does stepper motor work

Answer 3

h converts

electrical pulses into discrete mechanical movements

Question 4

what 2 things can motors be

Answer 4

bipolar or unipolar

Question 5

how is a bipolar magnet constructed

Answer 5

two windings, having 4 wires

H-bridge for each winding

Question 6

how is a unipolar magnet constructed

Answer 6

5, 6 or 8 wires, with centre tap for each windings

2 windings

Question 7

what are 3 most common drive modes

Answer 7

complete step
full step drive
half step drive

Question 8

how many individual steps are required for one rotation for a half step drive

Answer 8

64 individual steps

Question 9

2 benefits of a gearbox

Answer 9

increased angular resolution

increased torque

Question 10

what is ULN2003A

Answer 10

chip on stepper motor circuit board

Question 11

with complete wave drive, how many coils are activated and what degree steps

Answer 11

one coil

11.52 degrees

Question 12

full step drive coil count and step angle degrees

Answer 12

2 coils 11.52 degrees