jeff shelton 10 march 2015 1 - purdue engineeringjeff shelton – 10 march 2015 electric motors dc...
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Jeff Shelton – 10 March 2015 1
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Jeff Shelton – 10 March 2015
Shaft (Rotor) Angle
I1
I2
I3
2
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Jeff Shelton – 10 March 2015
Electric Motors
DC Motors
Permanent Magnet
Series Wound
Compounded
Shunt Wound
Separately Excited
Brushed
Brushless
Stepper
AC Motors
Reluctance
Hysteresis
Synchronous
Induction
Wound Rotor
Squirrel Cage
Permanent Magnet
3
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Jeff Shelton – 10 March 2015 4
Image: http://electronics.howstuffworks.com/brushless-motor.htm
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Image: http://www.rcuniverse.com/magazine/reviews/1344/BrushlessMotors7.jpg
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Jeff Shelton – 10 March 2015
Shaft (Rotor) Angle
I1
I2
I3
6
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Jeff Shelton – 10 March 2015
Electric Motors
DC Motors AC Motors
Permanent Magnet
Brushed
Brushless
Reluctance
Hysteresis
Stepper
Synchronous
Induction
Wound Rotor
Squirrel Cage
Series Wound
Compounded
Shunt Wound
Separately Excited
Permanent Magnet
8
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What does it all mean?
Image: http://www.pololu.com/category/87/stepper-motors
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Jeff Shelton – 10 March 2015
10
Image: http://www.engineersgarage.com/articles/stepper-motors
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Motor Driver
Current to Windings
Indexer Step Pulses
Controller
Movement Sequence
Images: http://www.automationdirect.com/adc/Overview/Catalog/Motion_Control/Stepper_Systems
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N N
N
A
A'
B B'
14
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N N
N
A
A'
B B'
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N N
N
A
A'
B B'
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Jeff Shelton – 10 March 2015
N
N
N N
N
Initial equilibrium state
Horizontal winding field reversed (no motion yet)
Motion starts toward new equilibrium
Reach new equilibrium
N N
S
S N
N
N
N S
N N
S
N N
N
S
N
S
N
N
N S
S
N
N
N
17
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S N S N N S
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Jeff Shelton – 10 March 2015
ℱ
19
+ –
ℱ = 𝑁𝑖
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+ –
ℱ = Φ ℜ𝑚
𝑉 = 𝑖 𝑅
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+ –
Core
ℱ = Φ ℜ𝑚
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Jeff Shelton – 10 March 2015
Φ
ℜ𝑚
22
Φ =𝑁𝐼
ℜ𝑚
+ –
Core
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Φ =𝑁𝐼
ℜ𝑚
+ –
Core
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N S
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Jeff Shelton – 10 March 2015
β
27
𝛽 =𝑁𝑠 − 𝑁𝑟
𝑁𝑠 ∙ 𝑁𝑟× 360°
30°
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Jeff Shelton – 10 March 2015
1 1
2
2
3
3
1 1
2
2
3
3
1 1
2 3
1 1
2 3
2 3 2 3
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29
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S
S S N
N N
N
S
S
S
S
N
N
N
S S
S
N
N N
30
N S
N
S
N S
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Comparison adopted from: http://www.automotsys.com.au/stepserv.html
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Comparison adopted from: http://www.automotsys.com.au/stepserv.html
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Comparison adopted from: http://www.automotsys.com.au/stepserv.html
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Jeff Shelton – 10 March 2015
A
B
(a) (b) (c) (d)
A
B ON
OFF ON
OFF ON
OFF ON
OFF
34
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Jeff Shelton – 10 March 2015
A
B
(a) (b) (c) (d)
A
B
35
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Vs
GND
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Vs
GND
Have to swap leads to reverse magnetic polarity
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Vs
GND
Have to swap leads to reverse magnetic polarity
Vs
GND
Vs or GND
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Vs
GND
Have to swap leads to reverse magnetic polarity
Vs
GND
Vs or GND
No lead swapping, but less torque production
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⟹
41
On the same frame, bipolar motors can deliver about 40% more torque than
unipolar motors
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1 2 3 4
Phase 1
Phase 2
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1 2 3 4
Phase 1A (Q1)
Phase 1B (Q2)
Phase 2C (Q3)
Phase 2D (Q4)
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Q5 Q6
Q7 Q8
A
B
(1) (2) (3) (4)
A B
A
B
(1) (2) (3) (4) (5) (6) (7) (8)
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Jeff Shelton – 10 March 2015
Pulse
Direction
Q1 Q2 Q3 Q4
Input: P & D
Output: Q1 & Q3
2 1 and 4 3Q Q Q Q
S0
S3 S2
S1
11 10
00 01
11
11
11
11
10
10
10
10
1 2 3 4
Phase 1A (Q1)
Phase 1B (Q2)
Phase 2C (Q3)
Phase 2D (Q4)
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Time
Step
(A
ngu
lar
Posi
tio
n)
50
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Jeff Shelton – 10 March 2015
Torque
Spee
d (
Step
Rat
e)
Start/Stop Curve (limit)
Slew Curve (limit)
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