Development of G2 Motion Control Sensor Using MI Sensor in

Development of G2 Motion Control Sensor Using MI Sensor in

Spanish Club of Magnetism Oviedo
1
Development of G2 Motion Control Sensor
Using MI Sensor in Mobile Phones
Dr. Yoshinobu Honkura
Director of Aichi Steel Corporation
October 28th, 2005.
2
Recent News
3
Mr. Akiyoshi Morita
President of Aichi Steel Corporation
In the December 2005 issue of
Forbes Japan Magazine
Mr. Morita was ranked in the Top Ten
out of the100 Most Powerful CEOs
in Japan
Forging Plants of Aichi Steel Corporation
Thailand
Louisville
Shanghai
Aichi Steel (Japan)
0.7km
1.5km
World’s largest forging plant
Indonesia
Philippines
4
Kentucky
Magnet Division: MAGFINE and MAGFINE motor
MAGFINE is the World’s Strongest Bonded Magnet developed by Aichi
Steel Corporation.
MAGFINE motor is 50% lighter in weight than a conventional DC motor
From October 2005, Toyota adopted the MAGFINE motor
MAGFINE motor should contribute to a 20kg weight reduction in one car
and will expand to global automobile market..
Conventional
DC motor
MAGFINE motor
Automobile Market
Overview:
30 pieces / car
Total: 2 billion pieces / year
200g off
Ferrite sintered magnet （4MGOe） MAGFINE motor (25MGOe）
Motor weight = 460g
Motor weight = 230g
A typical luxury car has
more than 100 pieces
5
Sensor Division:
6
2
Electronic compass and G Motion sensor using GMI sensor
●LG Electronics
Electronic Compass
Mecca Indicator Phone
Launched in March 2004
Mecca Indicator Phone
Model: LG-F7100
●Vodafone
G2 Motion Sensor
Game Mobile Phone
Launched in February 2005
AMI201
(2D sensor)
3.1×3.4×0.8mm
AMI501
(5D sensor)
5.5×5.5×1.5mm
Model: V603SH
(Made by Sharp)
For Japan market
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Outline
1. What is MI Sensor ?
- Introduction of MI Sensor Base Technology
2. Electronic Compass using MI Sensor
3. G2 Motion Control Sensor using MI Sensor
4. Application of G2 motion sensor
5.
Conclusion
8
MI Sensor Development History
80
85
90
Amorphous Wire Research
95
MI Sensor
Fundamentals
00
05
MI Sensor Development Industrialization
●8 companies → failure
Invention
of
Amorphous Wire
Discovery of
MI phenomenon
(Prof. Masumoto,
Tohoku Univ.)
(Prof. Mohri,
Nagoya Univ.)
1 million
times
sensitivity
human hair
150µm
amorphous wire
20µm
Visit
Prof.
Mohri
Funding by Develop
Japan
MI-IC
Government
Develop
Compass
Aichi Steel Corporation
9
MI Sensor Principle
Key Material: Amorphous Metal Wire
with ideal softmagnetic propreties
Crystal
Amorphous
Amorphous is non-crystallized
state in a solid substance
Human
hair
150µm
Amorphous
wire
20µm
Magnetic Domain Structure of Amorphous Wire
Surface layer thickness
400 nm
(10-6)
magnetostriction
Dial.20µm
10
Fe
Cobalt
Magnetostrictive 0 （95Co-5Fe）
Electronic Spin Alignment
11
Discovery of MI Principle in 1993
1 ns
V=
High Frequency Current
or Pulse Current
amorphous wire
coil
μθ
output voltage(ｍV)
103
Hex=1 Oe
102
new
phenomenon
10
1
10-1
93年
MI effect
Discovery
amorphous
wire
10-2
normal metal
0
1
output
voltage
a
Rdc "µ! (H ex )
2 2#
1k
1M
frequency（Hz）
1G
Pulse Current Drive Circuitry
•
Simplified signal processing
pulse generator
signal processing
MI element
（amorphous wire）
12
Output Signal Detected by Pickup Coil
1 ns after pulse input, the output voltage is measured in 0.2 ns
output voltage (V)
0.6
pulsed current
output voltage
at pickup coil
1 ns
0.4
0.2
0
-0.2
-0.4
-0.6
output voltage proportional to
external magnetic field
-0.8
-10
0
10
time (ns)
20
30
40
13
MI Element and Device Configuration
MI Element
14
0.8 mm
pickup coil
0.5mm
←
amorphous
wire
terminal
Signal
Processing IC
MI Element
15
Performance
(2) MI Element inherent temperature stability
2500
2000
hysteresis:
0.3%FS
1500
1000
linearity: 2.2%FS
500
-1000
0
1000
2000
magnetic field (milligauss)
+2 gauss
1.5
1.0
0 gauss
0.5
-2 gauss
10
0
-10
-20
-30
1
10
102
103
104
105
External magnetic field frequency (Hz)
-20
0
20
40
60
80
Temperature （℃）
(4) Noise Level
0.678
0.676
0.674
0.672
0.67
10kHz response
-40
-40
Output(V)
(3) Frequency Response
-50
2.0
0.0
0 -2000
Output change (dB)
Output voltage (V)
output voltage (mV)
(1) Linearity
0.668
0
2（mV）pp=5 mG≒1deg. azimuth approximately
1
22（mV）pp=5
3 mG≒1deg.
4 azimuth 5
Time(sec)
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Outline
1.
What is MI Sensor ?
2. Electronic Compass using MI Sensor
3. G2 Motion Control Sensor using MI Sensor
4. Application
5.
Conclusion
17
Electronic Compass and Block Diagram
Pulse
generator
Timing signal
generator
Switch
Differential
Amplifier
Power
regulator
Size：3.1×3.4×0.8mm
MI element
（X-Axis）
XYin
CS
Y axis
sensor
OUT
VDD
SGND
X axis sensor
PGND
IC
MI element
（Y-Axis）
CS power on signal
X/Y switching signal
Structure
Compass
(AMI201)
A/D
Converter
Micro
Processor
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Azimuth Calculation
MI element
（X axis）
Hy
tanθ=
Hx
IC
（θ= Azimuth）
MI element
（Y axis）
N
3.1×3.4×0.8mm
Hy
θ
Hx
S
Internal magnetic field in the mobile phone
X-axis magnetic field
19
Y-axis magnetic field
Magnetic field sources: Speaker, Open/Close detection magnet, Vibration motor, etc
20
Compensation of offset error due to internal magnetic fields
Measured Apparent Value
(Hx, Hy)
Hy
True Azimuth
tanθt = Hy
Hx
Apparent Azimuth
tanθa = Hy
Hx
True Value
(Hx, Hy)
Offset
θt
θa
Hy
Hx
Hx
Field Test Results in downtown Nagoya
N
S
92
N
354
99
N
S
16
181
N
S
S
267
S
S
S
90
350
N
S
N
N
N
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Mobile Phone-based Navigation Service
Navigation Service started from 2003 in Japan, China, and Korea
(1) Service Scheme
Compass
(2) Technologies
GPS
＋
Digital Map
＋
Compass
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Map Heading Up Feature by Compass
Map rotates in real time, according to user direction
User
Direction
User
Direction
Destination
Start
Direction of
movement
Destination
North Up
Map Rotates
in the Course
Direction
Direction of
movement
Start
Heading Up
23
Electronic Compass Product Lineup
axis
Product
2-axis
(2D)
3-axis
(3D)
Output
Size (mm)
AMI201
analog
voltage output
3.1×3.4×0.8
AMI302
analog
voltage output
3.5×4.0×1.5
serial
azimuth output
5.5×4.5×1.5
AMI303
Photo
coming soon
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Comparison with Other Products
Manufacturer
Aichi Steel AMI201
Company A
Company S
Detection Principle
Magneto Impedance
Hall Effect
Fluxgate
Sensitivity
◎290mV / gauss
Linearity
◎±2%FS
Package dimensions
◎
3.1×3.4×0.8mm
0.8mV / gauss
○
×
○
× 6.3×5.9×1.0mm
×
6.5×6.5×1.2mm
○ 2.5 - 3.6V
○ 2.65 - 2.95
× 25mW
× 25mW
× 16 segment
× 16 segment
Power supply voltage
○ 2.5 - 3.6V
Power consumption
◎ less than 4mW
Compass resolution
◎±1°(360 segment）
Compass response
◎>0.01 sec
Temp. stability
◎good
×
○
Price
◎Low
×High
×High
CONCLUSION
Suitable for mobile phones
Low sensitivity
Low resolution
Slow response
Low sensitivity
Low resolution
Slow response
0.05 sec
Best of Sensors Expo Award in Boston
•
High S/N ratio
2002/09/25
Silver Award:
AMI201 for electronic compasses, which uses amorphous
ferromagnetic wire to detect two components of the Earth’s
magnetic field.
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27
Outline
1.
What is MI Sensor ?
2. Electronic Compass using MI Sensor
3. G2 Motion Control Sensor using MI Sensor
4. Application
5. Conclusion
Chapter 3
G2
Motion Control Sensor
3D Electronic Compass
(Asahi Kasei)
Size：6.5×6.0×1.2mm
Degree resolution：10°
Response：
0.01s/Dimesion
2D acceleration sensor
(MEMSIC)
Size ：5.0×5.0×2.0mm
Degree resolution ：1°
Response ：
G2 Motion Control Sensor
An Innovative Integration
50% downsize
5.5×5.5×1.5mm
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G2 Motion Sensor Internal Structure
3D electronic compass part
29
2D acceleration sensor part
X-axis cantilever and MI element
Z-axis MI
element
5.5mm
5.5mm
Y-axis cantilever and MI element
Y-axis MI
element
X-axis MI
element
Control IC
Development of Accelerometer using MI sensor
Magnet
0.4×0.4×0.1ｍｍ
Coil
Cantilever thickness 4µm
Amorphous wire
1.5 mm
Cantilever unit
Cantilever
ＭＩ element
Magnet
Conventional Accelerometers:
Piezo resistor type、Capacitance
type
30
31
Output characteristics
1350
1300
- 1.5
0
Acceleration(G)
1.5
Output Voltage(mV)
Output Voltage(mV)
X-Axis
1450
1400
Y-Axis
1500
1450
1400
1350
1300
- 1.5
0
Acceleration(G)
1.5
32
Principle of detecting tilt by accelerometer
Canti lever
Canti lever
magnet
MIsensor
Horizontal
φ=0
φ=45°
An example of output voltage versus tilt angle
Output Voltage(mV)
MI sensor
1500
1450
1400
1350
1300
- 90 - 60 - 30
0
30
Tilt Angle(deg.)
φ=90°
60
90
33
Resonance frequency
Transmissibility（Ｔ）
100
Resonance frequency⇒
200Hz
δ
Available range
Less than 100Hz
10
bendingδ= 1
4×G×L3
E×b×h3
Resonance fr=（1/2π）
0.1
√（k/m）
k：Spring constant
m：weight
1
10
100
1000Hz
1Sec
0.1Sec
0.01Sec
0.001Sec
Frequency（Hz）
E：young ratio
b：width
h：height
L：length
Circuit Block Diagram
34
CH3
Pulse
generator
Synchronous
Detection Control
Sample Hold
(X,Y selection)
X axis
sensor
OUT_A
Differential
Amplifier
Reference
Voltage
Y axis
magnet
Power
control
VDD1
Power
control
VDD1
CS_A
Y axis sensor
X axis
magnet
CS_C
CH2
Pulse
generator
CH1
Synchronous
Detection Control
Sample Hold
(X,Y,Z selection)
Reference
Voltage
X axis
sensor
Y axis sensor
Z axis sensor
OUT_C
Differential
Amplifier
VDD1
VDD2
VDD1
VDD2
GND1
GND2
Specifications
35
Major Characteristics
Appearance
Item
Magnetic sensor
5.5×5.5×1.5mm
Condition
Min.
Power supply
2.6
Operating
temperature
-20
Operating range
Typ .
Max.
3.0
3.6
V
+85
℃
0.3
Output linearity
mT
1.3
4
Output voltage at zero
magnetic field
800
1500
2200
Sensitivity
1.3
3.0
4.2
Frequency response
Operating range
VDD=3.0V
1
2
Accelerometer
Output linearity
Unit
%FS
mV
mV/ μT
kHz
g
2
5
%FS
Output voltage at zero
g, zero magnetic field
800
1500
2200
mV
Sensitivity
40
80
200
mV/g
100
Hz
Frequency response
G2 Motion Sensor can detect attitude
36
Geomagnetism is measured by MI sensor
Gravity is measured by accelerometer using MI sensor.
3D magnetic sensor
z
Geomagnetis
Hz m
Hx
x
Hy
2D accelerometer sensor
rollφ
Detecting the horizontal
plane
y
ψ
（Azimuth Angle）
pitchθ
Discriminating a translation
or a rotation
Gravity
Hy
tanψ= Hx
Geomagnetism
Gravity
Detecting ATTITUDE (G2 Motion Sensor)
G2 Motion Control Sensor Demonstration
37
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Outline
1.
What is MI Sensor?
2. Electronic Compass using MI Sensor
3. G2 Motion Control Sensor using MI Sensor
4. Applications
5.
Conclusion
39
Chapter 4 Recent Trend to offer new service using Sensors
Compass and accelerometer and their integration will create new applications
such as Games, Navigation Service, Input Device and so on.
Maker
LG
（Korea）
Model No
SV360
Release
Sensor
Applicati
on
Accelero
meter
Game
Pantech
（Korea）
Samsung
（Korea）
Sharp
（Japan）
Nokia
(Finland)
Siemens
AG
(Germany)
LP3000
PH-S6500
SCH-S310
V603SH
Nokia3230
CX70Emoty
June 2005
February 2005
May 2005
February 2005
May 2005
May 2005
3-Axis
Accelerometer
3-Axis
Geomagnetic
3-Axis
Accelerometer
3-Axis
Geomagnetic
3-Axis
Acceleromete
r
Geomagnetic
Acceleromete
r
Accelerometer
Navigation
Electronic
Compass
Pedometer
Input Device
Electronic
Compass
Game
Input Device
Electronic
Compass
Game
Input Device
2-Axis
Accelerometer
3-Axis
Geomagnetic
Game
Input Device
Electronic
Compass
40
Applications offered by Vodafone
1. Game
2. TV view rotation
Shooting Game
3. Cursor Control
（Mouse Function：Analog input）
Golf Game
V603SH by Sharp
2005 release
AMI501
5. Input by Swing Motion
6. Shake Sounder
Others: Baseball Game, Balance Game, etc.
7. Shake Counter
4. 3-Axis
Electronic
Compass
41
Future Applications for Mobile Phone
Pedometer
Anti-Shake Correction
Navigation system
Drop Detection
Next
year
AMI601
Diving simulation
Flight simulation
3D puzzle
3D CG
shopping
42
Future improvement of G2 Motion Sensor
① 6 Dimension
5 Dimension
6 Dimension
Detect whole 360°Rotation
Difficult over 70°
Z-Axis
Magnetic
Vector
±70°
Y-Axis
X-Axis
② Miniaturization
3-Axis Electronic Compass
3-Axis Accelerometer
1000
Volume (mm3)
Volume (mm3)
1000
100
10
1
2001
g vector
2003 2005
(Year）
targe
t
2007
100
10
targe
1
t
1999 2001 2003 2005 2007
(Year）
Expansion of G2 Motion Sensor applications
43
G2 Motion sensor is similar to an electronic semicircular canal which is needed for
digital mobile devices such as:
Attitude stability of robot
Sensor
Sensor
Traveling stability of car
Sensor
Ship
Sensor
Bicycle
Robot
Sensor
RC Helicopter
Many application possibilities for Automobiles
Compass
Rotation
Sensor
Current
sensor
Attitude detector
Angle sensor
ＡＢＳ wheel
rotation sensor
Torque
sensor
TPMS
Automated
Driving
Traffic detection
New systems
Existing systems
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45
Outline
1.
What is MI Sensor ?
2. Electronic Compass using MI Sensor
3. G2 Motion Control Sensor using MI Sensor
4. Application
5.
Conclusion
46
Chapter 5 Conclusion
What is GMI sensor?
GMI Sensor is the 3rd Generation Magnetic Sensor.
３rd Generation
Micro-size sensitivity 0.1mgauss
MI Sensor
Performance
Nanotechnology
２nd Generation
Micro-size sensitivity 1gauss
Hall Sensor, MR Sensor
Semiconductor Technology
１st Generation
Magnetic Detection Coil
1900
1960
1990
Thank you very much for your attention
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