Homework 1, Problem 1
Let the elements of the vector correspond to the x, y, and z components
1
H := 0
0
Now
1
Point1 := 1
1
2
Point2 := 5
1
Since the H-field is constant
Point2
H dl = H ( Point2 Point1)
Point1
Thus the MMF drop is given by
T
H (
Fall 2010
ECE 321 Homework Set 3
Due Wed. Sept. 29
Work on separate sheets of paper. Must be turned in at beginning of class. First page blank with only your name and should be stapled. Homework will be collected promptly at 2:30. If not submitted in time
EE321 Spring 10
Homework 1
Problem 1 Review of line-integral and application to MMF drop.
Consider a Cartesian co-ordinate system (x,y,z). Suppose a uniform H-field of 1 A/m
exists in the direction of the x-axis. Calculate the MMF drop from the point (1,1
EE321, Spring 2013
Homework 4
Problem 1
1
2
Wc = 5 + 2 sin 4 rm i
2
(
(
(
)
Te = 4 cos 4 rm i
)
2
Problem 2
We may express the system as
1
2
7
5
2
5 + x i1
=
7
i
2 2
2
5+x
which is of the form
i
1
= L 1
2
i2
where L is independent of both c
EE321 Spring 2008 / Homework 9
Problem 37 Discrete winding function
The number of conductors in each slot of the a-phase of the stator of the machine
are as follows:
N as = [10 20 20 10 10 20 20 10 10 20 20 10 10 20 20 10]T
Compute and graph the winding f
Problem 1 - Simple UI Core Analyiss
Dimensions, etc
2
3
cm := 1 10
mm := 1.0 10
w := 1 cm
d s := 2 cm
g := 1.5 mm
ws := 5 cm
d := 5 cm
N := 100
B sat := 1.5
Point where saturation occurs
7
u 0 := 4 10
Now let's compute some reluctances. For flux densities
ECE321/ECE595 Spring 2013 HW#9
Problem 1
(
)
(
)
was = 100 cos 4 s
wbs = 250 sin 4 s
ias = 10 cos e t +
B = 1.2 cos e t +
8
8
4 s
7
0 := 4 10
Expanding B we have
B = 1.2 cos e t +
Also
B=
F=
F
g
0
g
0
B
cos( 4 s) + 1.2 sin e t + 8 sin( 4 s)
8
Finally
F
EE321 Spring 2008 / Homework 8
Problem 33 Buck converter operation
Consider the example on page 11 of the lecture notes. Suppose the dc voltage is
changed to 150 V and the speed to 450 rad/s. Find the average armature current, the
average switch current,
Lecture Set 0
ECE321/ECE595
Electromechanical Motion Devices/
Electromechanics
S.D. Sudhoff
Spring 2013
Courses Meeting Together
Courses
ECE321 Live cfw_321L
ECE321 Video cfw_321V
ECE595 On Campus (Live and Video) cfw_595C
ECE595 Off Campus Pro Ed cfw_59
EE321 Spring 08 HW8
Problem 33
Buck Converter Operation
Consider a machine with the following parameters:
ra := 0.1
k v := 0.2
The machine is fed using a buck converter with the following parameters
v fsw := 2.4
v fd := 2.0
v dc := 150
d := 0.7
The machin
EE321 Spring 2012
Homework 1
Problem 1 Review of line-integral and application to MMF drop.
Consider a Cartesian co-ordinate system (x,y,z). Suppose a uniform H-field of 1 A/m
exists in the direction of the x-axis. Calculate the MMF drop from the point (1
Homework 1, Problem 1
Let the elements of the vector correspond to the x, y, and z components
1
H := 0
0
Now
1
Point1 := 1
1
5
Point2 := 2
1
Since the H-field is constant
Point2
H dl = H ( Point2 Point1)
Point1
Thus the MMF drop is given by
T
H (
ECE321/ECE595 Spring 2012
Homework 6
Problem 1 Permanent Magnet DC Machine
A permanent magnet dc machine has ra = 8 and kv = 0.01 Vs/rad. The shaft load torque is
approximated as TL = Kr, where K = 510-6 Nms. The applied voltage is 6 V and Bm = 0.
Calcula
EE321 Spring 2010
Homework 4
Problem 1 Calculation of Torque
The flux-linkage of a certain rotational electromechanical device may be
expressed
= (5 + 2 sin 4 rm )i
where rm is the rotor position and i is the current. What is the electromagnetic torque ?
EE321 Spring 2013
Homework 4
Problem 1 Calculation of Torque
The flux-linkage of a certain rotational electromechanical device may be
expressed
= (5 + 2sin 4 rm )i
where rm is the rotor position and i is the current. What is the electromagnetic torque ?
Problem 1 - Simple UI Core Analyiss
Dimensions, etc
2
3
cm := 1 10
mm := 1.0 10
w := 1 cm
d s := 2 cm
g := 1.5 mm
ws := 5 cm
d := 5 cm
N := 100
B sat := 1.3
Point where saturation occurs
7
u 0 := 4 10
Now let's compute some reluctances. For flux densities
EE321 Spring 2010
Homework 3
Problem 1 UI Inductor Analysis
Consider the UI inductor design we did in class. Recall we had
N = 260 Turns
d = 8.4857 cm
g = 13.069 mm
w = 1.813 cm
aw = 21.5181 mm2
ds = 8.94 cm
ws = 8.94 cm
In our design, we assumed that the
EE321 Spring 2012
Homework 1
Problem 1 Review of line-integral and application to MMF drop.
Consider a Cartesian co-ordinate system (x,y,z). Suppose a uniform H-field of 1 A/m
exists in the direction of the x-axis. Calculate the MMF drop from the point (1
EE321. ABET Exam
Spring 2004
Name:
Student ID:
Instructions:
Work ALL Problems. When you have completed exam, turn in to Professor Sudhoff,
Brandon Cassimere, or Brant Cassimere, any of whom will check it on the spot, and let
you know which ones are wrong
Lecture Set 0
ECE321/ECE595
S.D. Sudhoff
Electromechanical Motion Devices
Spring 2012
Courses Meeting Together
Courses
ECE321 Live (57) cfw_321L
ECE321 Video (9) cfw_321V
ECE595 On Campus (3) cfw_595C
ECE595 Off Campus Pro Ed (11) cfw_595P
Differences
321
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ECE321/595 Spring 2013
Homework 14
Problem 1 Steady-State Operation
Consider a 2-phase machine with the following parameters: rs = 72.5 m , Lls = L'lr = 1.32 mH,
Lm = 20.1 mH, rr' = 41.3 m , and P = 4 . The load torque varies with the speed cubed, and is
Lecture Set 6
Brushless DC Machines
S.D. Sudhoff
Spring 2013
Reading
Chapter 8, Electromechanical Motion
Devices, 2nd Edition
2
A Brushless DC Machine
3
Sample Applications
Low Power:
Disk drive motors
Medium Power:
Robot manipulators
Servo systems
Hyb
Lecture Set 1
Introduction
Introduction to
Magnetic Circuits
S.D. Sudhoff
Spring 2013
1
Goals
Review physical laws pertaining to analysis
of magnetic systems
Introduce concept of magnetic circuit as
means to obtain an electric circuit
Learn how to dete
ECE321/ECE595 Exam 2
Spring 2016
Notes: You must Show work for credit.
This exam has 4 problems and 7 pages.
Note that problem 4 is different depending on if you are in ECE321 or ECES 95.
Good luck! 1a.) 13 pts. An electromechanical device produces a torq
Exam 1 Solutions
Problem 1
A = 1cm2 = 10-4m2
R = 10cm = 10*10-2m
g = 1mm = 10-3m
N = 100
I = 10A
= 4.2536*10-3 V.s
B
NA
= (4.2536*10-3)/ (100*10-2)2
lm 2 r g
= 0.627319m
H .dl i
enc
Ni
H mlm H g g Ni
H mlm B / o Ni
H m = 1054.5Am-1
B / H m = 4.03375*1
ECE321/ECE595 Exam 1
Spring 2016
Notes: You must show work for credit.
This exam has 4 problems and 10 pages.
Note that problems 2 and 3 are different depending on if you are in ECE321 or
ECE595.
Good luck!
1
1.) 25 pts. Consider a toroid of magnetic mate
ECE321/ECE595 Exam 2
Spring 2016
Notes: You must show work for credit.
This exam has 4 problems and 7 pages.
Note that problem 4 is different depending on if you are in ECE321 or ECE595.
Good luck!
1
1a.) 13 pts. An electromechanical device produces a tor