{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

exam2

# exam2 - EE321 Exam 2 Spring 2006 Name Student ID...

This preview shows pages 1–3. Sign up to view the full content.

EE321 Exam 2 Spring 2006 Name: Student ID: Instructions:

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
1.) 10 pts. Consider a 3-phase multi-stack variable reluctance stepper motor. Suppose it has a step length (single step) of 15 o . As the rotor is turned, the self inductance varies between 1 and 5 mH. Write an expression for the a-phase self-inductance as a function of rotor position. The only variable in this expression should be the rotor position. A sample (but incorrect) answer is ) 8 cos( 03 . 0 05 . 0 rm asas L θ + = H. 2.) 10 pts. In the context of a variable reluctance stepper motor, explain why some equilibrium points are unstable. A good approach to answering this question would be to make a sketch and then describe a relevant scenario (one is enough) which illustrates why the equilibrium point is unstable. 3.) 5 pts. Draw two circuits used to drive a variable reluctance stepper motor. List one advantage of each circuit each relative to the other. 4.)
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 3

exam2 - EE321 Exam 2 Spring 2006 Name Student ID...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online