advanced position sensing - vogel · 2017. 10. 21. · confidential © ams ag 2014 page 3. our...
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Confidential © ams AG 2014
Oliver WeberMarketing & Business Development SSI Asia
Advanced position sensing for EPS and other motor controlled applications
December 2014
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At a glance• Focus on high performance analog semiconductors• Sensor solutions, sensor interfaces, power management, wireless• Ultra-low power, highest accuracy, sensitivity and integration• Analog IDM: world class design + in-house manufacturing
By the numbers• Over 30 years of design experience• Revenues 2013 € 378m ($ 502m)• More than 1,400 employees worldwide • Over 7,800 customers worldwide
ams overview
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Our focus
High performance analog ICs
Target markets Consumer and Communications Automotive, Industrial & Medical
Core expertise Sensor and sensorinterfaces
Powermanagement Wireless
Shaping the world with sensor solutions.
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Sensors which measure angular or linear position• Contacting: through a mechanical connection• Non-contacting: without physical contact
Non-contacting position sensors are• more reliable• offer a longer functional life due to the absence of mechanical
parts and physical contact
Strong market-trend to move from simple angle and distance sensors towards robust, intelligent sensor systems and applications with multiple simultaneous measurement axes.
ams focuses on non-contacting, hall-based and intelligent Position Sensors
What are position sensors?
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• Emergence of contactless and integrated magnetic position sensors
• Traditional sensors are replaced by contactless sensors that handle complex and highly integrated electronics – delivering higher sensitivity, smaller form factors and increased flexibility
• Strong trend from simple angle and distance sensors towards robust, intelligent sensor systems and applications with multiple simultaneous measurement axes
• Tackling the shortcomings of optical, magneto resistive, inductive and linear Hall sensors and switches
• Longest lifetime, insensitive to humidity, dust, dirt and harsh environments
• Solutions offer enhanced precision, repeatability, and robustness andstray field immunity.
Why hall-based magnetic position sensing?
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Hall-effect magnetic position sensors
3D positionAngle position Linear position
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Measure the linear part of the magnetic fieldMagnetic field basics
Measured magnetic field
NS
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ams patented technology is using 4 Hall sensorsPlacing the magnet above the sensor area
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ams patented principleImmune to external magnetic stray fields
H2H4 Hall
0
[V] Volts
12
3
4
Vdi
ff 1
Vdi
ff 2
external magnetic stray field
Vdiff 1 = Vdiff 2
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vertical magnetic field Bz
characteristics
=
)cos(*ˆ)sin(*ˆ
arctanα
αα
a
a)tan(
)cos(*ˆ)sin(*ˆ
αα
α=
aa
How does it work?Hall-based magnetic position sensing
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The need for Contactless Technologies• Magnetic sensors are replacing other types of sensors i.e. inductive
sensors, optical sensors, potentiometer technology, increased need for precision & safety (i.e. ISO26262)
Improvements in Reliability & Precision• Powertrain hybridization, more electronics in the car, the need for higher
reliability in transmission applications, higher precision in powertrain applications e. g. start/stop systems
Lower CO2 emissions requirements • Better sensor performance & higher resolution, steering applications with
reduced standby current and a smart “measurement on demand” Cost reduction
• Sensors with new digital interfaces i.e. SENT replace sensors with traditional analog output, enhanced robustness/diagnostic, cost reductions for the entire signal chain
Increased use of brush-less (BLDC) motors• Major advantages of brushless DC motors include higher efficiency at
converting electricity into mechanical power, reduced noise, longer lifetime and higher reliability.“
Trends in the automotive market
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Selected position sensor applications
Exhaust gas recirculation sensor (EGR)
Electronic Power Steering (EPS)
Gearbox / Gear shifter
SteeringColumn
Automatic-manual (AMT) / Dual-clutch transmission (DCT)
Throttle
Pedals
Chassis level
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• Steering system ECUs are growing faster than any other vehicle Domain – 15% CAAGR global 2007-2017
• Electric Power Steering dominates the steering market• EPS outperforms other markets in growth
EPS covers all car segments
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2014• 99% of the EPS Motors are using brush• Mainly resolvers used for motor control
2015-2016 Trends• Strong trend to replace brushed motors with brushless motors• Adding magnetic position sensors for motor commutation & motor control
Strong growth for highly accurate magnetic position sensing demand ahead!
EPS in China
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• Magnetic position sensing is becoming the leading solution for automobile EPS systems
• Sophisticated sensor devices with multiple sensing elements on a single die enable faster and more accurate acquisition of information.
• Precise position of the automobile's steering wheel, improved performance of its EPS system while keeping costs and required space to a minimum.
- Stability over temperature- Robustness against tolerances- Robustness against interfering field- Up to 7 pole pairs- Up to 14.500 rpm (depending on
application)- Angle error <1° deg- ISO26262-compliance
Integrated position sensing in EPS
BLDC
Rotor Position Sensor
Electric Power Steering leads the steering market, EPS outperforms other markets in growth.
The motor position sensor controls the
commutation of a brushless DC motor
employed in the system.
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AS5235
• Resolution: 10.5-bit • Maximum speed: 12000rpm• Low system propagation delay: 20µs• rms output noise: 0.15degree• SPI interface with in-system programming• Integrated turns counter: 12-bit• Current consumption
• Normal Operating Mode: 17mA• Low Power Mode*: 6mA• Sleep Mode**: 50µA
• Input Magnetic field Bz: 20 – 90 mT• Wide temperature range -40 – 150°C• Dual-die
SAS + MC single on-axis position sensor (embedded)
**100ms polling time* 100% duty cycle with reduces noise performance
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ams’ stacked die solutionMaximum safety
Schematic concept
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New series of magnetic position sensors ideally suited to all motor control and angle measurement applications
• AS5147 - automotive applications • AS5147P – for rotation speeds up to 28.000rpm• AS5247 - functional safety compliance
DAEC™ (Dynamic Angle Error Compensation)• Eliminating the measurement errors as a result of
propagation delays. • Extremely accurate angle measurements of rotors
spinning at high speed• Specified with a maximum ±0.17° angle error at
14,500rpm (excluding INL and noise)
Of course, with complete stray field immunity • Proven differential sensing technique - like all ams
magnetic position sensors• Enables the devices to be used in electrically noisy
environments without need for shielding.
The new generation position sensors - enabling best in class accuracy at high rotation speedsAS5x47 series
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System propagation delayCausing a “natural” angle error
tdelay = 40-100µs
Position Sensor
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Dynamic angle errorSpeed dependent angle error
Speed: 10 RPMDAE = 0,012°
Speed: 1.000 RPMDAE = 1,20°Speed: 10.000 RPMDAE = 12,0°
100µs
0.02.04.06.08.0
10.012.014.016.018.020.0
- 5,000 10,000 15,000
Dynamic Angle Error [deg]
Angle Error [deg]
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Integrated dynamic angle error compensation – patent registeredDAEC™ - Revolutionary
Dynamic Angle Error
Hardware Compensation integrated!No Software needed – a perfect solution for EPS Motor Control
External HW + SW compensation needed
Mag
netic
Pos
ition
Sen
sor S
yste
m
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Commitment to Quality & Safety
Zero-defect philosophy & culture
• AEC-Q100 automotive qualification, "Safe Launch Program“, "Burn-In" and "Three-Temperature" testing procedure
Functional Safety is an integral part of ams’ IC Design & Development process
• Diagnosis IP, ISO conformant development, 200mm in-house wafer fab, ISO-TS16949
• Very low defect density, ID for every automotive IC, in-house ESD/EMC lab
Adhering to latest Quality/Safety Standards i.e. ISO26262
• ISO26262 - track-record for cost effective implementation, development flow conformant, safety manager for ISO26262 projects
• Close collaboration between IC developer and user at FMEDA, considering all diagnosis functions, IC-internal and host system
Hall-based Magnetic Position Sensing
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Launch next generation products• Coming soon AS560X series - potentiometer replacement• Coming soon: AS54XX series – long stroke linear position sensing
New product development and continuous improvements• Performance (higher accuracy), interfaces (SENT, PSI5), package
(PCB-less)
Products that deliver increased safety and reliability • ISO26262, automotive qualification, short lead times
Enabling low-cost and smaller magnets• Magnetic input field … 5mT
Providing smaller magnets and lower assembly tolerances• Integral Non-Linearity ... ±0.42°
Products that accelerate and simplify the design process• Simplify products and tools – application support
Where We Are Going…
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Confidential © ams AG 2013
Thank you
Please visit our website www.ams.com
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