cmpe 118 mechatronics solenoids, dc motors and the fine art of snubbing
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Solenoids, DC Motors
And the fine art of Snubbing
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Solenoids
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Most Common Solenoid Types
Pull Push Open-Frame Rotary
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Solenoid Characteristics
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Design Affects Stroke vs. Force Characteristic
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Typical Solenoid Specifications
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
DC Motors provide Rotary Motion
Where do you find them?
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
The Permanent Magnet DC Motor
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Commutation
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Electrical Model of a DC Motor
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Deriving some useful relationships
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
More Room for Derivations
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Torque vs. Speed Power vs. Torque
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
How Does P change with V at Constant T?
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Where is PMAX and What is its Value?
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Torque vs. Everything
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
DC Motor Specifications
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Operating Ranges
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Defining ‘Short Term Operation’
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
CMPE-118 DC Motor Lecture ProblemYou have been assigned to follow up on the design of a former employee who had not taken CMPE-118. Your supervisor suspects that they didn't know what they were doing. The only documentation that you can find shows that the motor chosen has Kt = 9.33 in.-oz./A and produces 2.8 in.-oz. at stall when driven at 12V. The design requires that the motor deliver 0.4 in.-oz. at 1500 rpm. The motor was supposed to be driven from a 12V supply and switched by a ULN2003. Your boss has asked you:
a) How can I find out how much current the motor will draw at stall ?
b) Can the ULN2003 safely switch the required current?
c) How can I find the NL Speed ?
d) How can I find the coil resistance ?
e) How can I find the torque at a given speed ?
f) Will the design meet the requirements for torque & speed? If not, what changes could you suggest?
g) To estimate the current required when running at the design point.
You may assume that there are no internal losses within the motor.KT = 1.3524KE [oz-in/A ; V/krpm]
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Motor Design SolutionKt = 9.33 in.-oz./A Tstall = 2.8 in.-oz.Vstall = 12V. Treq = 0.4 in.-oz. req =1500 rpm. KT = 1.3524KE [oz-in/A ; V/krpm]
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Directional ControlWith a Single Power Supply
The H-Bridge
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Pulse Width Modulation
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
DC Motor Drive Simulation + V12V
E xt F ile
0 /0V2N 3055
1.2m H
50
11 .4
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Drive Waveform
0 1 6 7 u 3 3 3 u 5 0 0 u 6 6 7 u 8 3 3 u 1 m- 2 0 0 m
7 0 0 m
1 . 6
2 . 5
3 . 4
4 . 3
5 . 2
R e f = G r o u n d X = 1 6 7 u S / D i v
Vol
ts
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Transistor Current
0 1 6 7 u 3 3 3 u 5 0 0 u 6 6 7 u 8 3 3 u 1 m- 4 0 m
1 4 3 m
3 2 6 m
5 1 0 m
6 9 4 m
8 7 7 m
1 . 0 6
R e f = G r o u n d X = 1 6 7 u S / D i v
Cur
rent
(A
)
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Inductor Current
0 167u 333u 500u 667u 833u 1m-1.06
-87 6m
-69 2m
-50 7m
-32 2m
-13 7m
47.2m
R ef=G ro und X= 16 7uS /D iv
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Collector Voltage
0 16 7u 33 3u 50 0u 66 7u 83 3u 1 m
29 .4
68 .1
10 7
14 6
18 4
22 3
R e f= G ro un d X = 1 67 uS /D iv
0
Vol
ts
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Diode Snubber+V
12V
E xt F ile
0 /0V 2N 3055
1.2m H DIO D E
50
11 .4
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Collector Voltage w/ Diode Snubber
0 1 6 7 u 3 3 3 u 5 0 0 u 6 6 7 u 8 3 3 u 1 m- 4 7 9 m
1 . 8 2
4 . 1 3
6 . 4 3
8 . 7 4
1 1
1 3 . 3
R e f = G r o u n d X = 1 6 7 u S / D i v
Vol
ts
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Inductor Current w/ Diode Snubber
0 1 6 7 u 3 3 3 u 5 0 0 u 6 6 7 u 8 3 3 u 1 m- 1 . 0 6
- 8 7 7 m
- 6 9 4 m
- 5 1 0 m
- 3 2 6 m
- 1 4 3 m
4 0 . 8 m
R e f = G r o u n d X = 1 6 7 u S / D i v
Cur
rent
(A)
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
How would we add diodesto protect the H-Bridge?
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
+V12V
E xt F ile
0 /0V 2N 3055
1.2m HDIO D E
ZE NE R
50
11 .4
Diode + Zener Diode Snubber
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
0 1 6 7 u 3 3 3 u 5 0 0 u 6 6 7 u 8 3 3 u 1 m- 1 . 5
5 . 4
1 2 . 3
1 9 . 2
2 6 . 1
3 3
3 9 . 9
R e f = G r o u n d X = 1 6 7 u S / D i v
Vo l
tag e
Collector Voltage with Diode + Zener Snubber
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
0 1 6 7 u 3 3 3 u 5 0 0 u 6 6 7 u 8 3 3 u 1 m- 1 . 0 6
- 8 7 7 m
- 6 9 3 m
- 5 0 9 m
- 3 2 5 m
- 1 4 1 m
4 2 . 5 m
R e f = G r o u n d X = 1 6 7 u S / D i v
Cur
r ent
Inductor Current with Diode + Zener Snubber
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
+V
Ext F ile
0/0V 2N3055
1.2m H
1N474950
11.4
Zener Only Snubber
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
0 1 6 7 u 3 3 3 u 5 0 0 u 6 6 7 u 8 3 3 u 1 m- 1 . 3 5
4 . 8 7
1 1 . 1
1 7 . 3
2 3 . 5
2 9 . 7
3 6
R e f = G r o u n d X = 1 6 7 u S / D i v
Vo l
tag e
Collector Voltage with Zener Only Snubber
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
3 0 3 u3 7 2 u 4 4 2 u 5 1 1 u 5 8 0 u 6 4 9 u 7 1 8 u- 1 . 0 6
- 8 7 5 m
- 6 9 0 m
- 5 0 6 m
- 3 2 1 m
- 1 3 7 m
4 7 . 6 m
R e f = G r o u n d X = 6 9 . 2 u S / D i v 2 4 1 %
Cur
r ent
Inductor Current Decay Comparison
Diode Only
Resistor + Diode
Diode + Zener
Zener Only
No Snubber
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
How would we add Zener diodesto protect the H-Bridge?
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
The Brushless DC Motor
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Commutating a Brushless DC Motor
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Hall Sensor Based Commutation
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
Brushed vs. Brushless DC Motors
Brushed Motor Brushless Motor
Mechanical Structure Field Magnets on statorWindings on Rotor
Field Magnets on RotorWindings on stator
Commutation MethodMechanical contact betweenbrushes and commutatoradded friction, brush debris,RFI
Electronic switching using transistorslow frequency harmonics due to ripple
Rotor Position Detection Automatically detected bybrushes
Hall Element, optical encoder, BackEMF
Reversing Method Reverse terminal voltage Rearrange logic sequencer
Distinctive FeaturesQuick responseExcellent controllabilityCurrent limited bybrush/commutator interfaceSpeed limited by brush bounce
Long LastingEasy or no maintenanceCurrent limited by winding resistanceonlyNo fundamental high frequency(speed) limitUsually more efficient than brushed
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CMPE 118 MECHATRONICSCMPE 118 MECHATRONICS
0 1 6 7 u 3 3 3 u 5 0 0 u 6 6 7 u 8 3 3 u 1 m- 1 . 0 6
- 8 7 7 m
- 6 9 4 m
- 5 1 0 m
- 3 2 6 m
- 1 4 3 m
4 1 m
R e f = G r o u n d X = 1 6 7 u S / D i v
Cur
r ent
Inductor Current with Zener Only Snubber