Posital Fraba Webinar. Sensing a Revolution: How Magnetic Sensing Technologies are Changing How You...
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Transcript of Posital Fraba Webinar. Sensing a Revolution: How Magnetic Sensing Technologies are Changing How You...
Sensing a Revolution: Magnetic Sensing Technologies
are Changing How You Use Rotary Encoders
Presented by: Jarrod Orszulak, Product Manager, POSITAL-FRABA Inc
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Meet The Presenter
Jarrod Orszulak
Product Manager POSITAL-FRABA Inc
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Thank You To Our Sponsors ELECTROMATE
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Contents
• History of Encoders • Status of Optical Encoders • Status of Magnetic Encoders • Kit Solutions • Choosing an Encoder • New Applications & Opportunities
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• Optical encoders were developed for space flight – Higher resolution – Longer lifetime
• Relied on detecting light through an optical code disk
History – 1950 ELECTROMATE
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History – Cont.
• Incremental encoder – Output is processed by external electronics – Encoder outputs pulses as the shaft is turned – Encoder must be homed, otherwise only
relative position is known – Also used for speed applications – A and B pulses can be used so
counting direction can be known
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History 1960’s
• Introduction of LEDs – Stable lighting conditions
• Encoders in new applications – Start to move outside of space and defense
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History 1970’s
• Absolute optical encoder – Each position of the code disk gives a unique
value – No homing is required – Multiturn ability through gear sets
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1980’s Fieldbus
• New complexity supported by encoders – Absolute position – Velocity – Status information
• Simplified wiring • New applications
– Mobile machinery – Material handling
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2000’s – Ethernet
• New connectivity and topology • ‘Real Time’ sensing
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2000’s – Magnetic Encoders Singleturn • Hall effect sensor
Multiturn • Weigand effect • Batteries • Gearing
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• Advantages – Compact – Low cost – Robust
• Disadvantages – High latency time
• Not good for high speed applications
– Susceptible to EMC – Temperature Drift – Limited resolution and
accuracy
2000’s – Magnetic Encoders ELECTROMATE
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2000’s – Weigand Technology
• Traditional gear sets don’t compliment magnetic encoder’s strengths
• Batteries are bulky, have a short life time and difficult to dispose of
• Weigand technology offers reliable counting, even with no power
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2000’s – Weigand Technology • Self Powered Counter • Energy & Position Information @ 0 rpm
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Mechanical Advantage ELECTROMATE
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History - Review ELECTROMATE
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Forget Everything You Know About Encoders
• New microprocessors address previous shortcomings in magnetic encoders – (32-bit microprocessor and all other
electronics on one 35mm board) – Latency time on par with optical encoders – Better accuracy (0.09°) and resolution (16 bit) – Maintain advantages of magnetic technology
• Robust • Compact
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Advances – Mass Customization
• Options are software based, not hardware – More options available
• Larger ‘standard’ selection • Customization is easier • Software changes can be made in-field
• Shorter lead times • Economical
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Advances - Latency
6000 rpm, 10,000 rad/s²
•OCD – Reference (°) •UCD – Reference (°) •MCD – Reference (°)
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Advances - Kit Solutions
• Mount the magnet directly to the shaft • Hall effect sensor is mounted flush to it • Advances in micro processing have
addressed: – Off-centric – Increased accuracy and resolution
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Advances - Kit Solutions • Absolute ST & MT on a single
PCB • No gears, no batteries • Compact & robust • Digital interfaces (SSI, BiSS,
SPI, Inc, UVW) • Shielding solutions • Low cost
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Choosing an Encoder
Shaft
Resolution
Flange
Singleturn/Multiturn
Electrical Interface
Housing Material
Communication
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Applications
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Applications – Food & Bev • Compact
– Easier to seal • Result in IP68/69k sensors that are appropriate for high
temperature, high pressure washdown
– Economical • Food grade stainless steel is expensive
• Easy installation – Variety of communication options make new and
retrofitting old applications easy • Hazardous environment (UL, ATEX, IECEx)
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Applications – Off Highway
• Robust – High shock and vibration resistance – No glass code disc or gearing – High temperature/washdown
• IP68/69k
• 16 bit resolution • Low cost for OEM applications • Customization
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Applications - Material Handling
• Programmable pulse count – Incremental and absolute encoders – Allows for fine tuning during installation – Significantly reduces stocking requirements
• Easy wiring – Fieldbus and Ethernet support a variety of
cable topologies
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Applications – Motors + Drives
• Compact • Recent advances in shielding • Many options
– Singleturn or multiturn – Absolute or incremental – Interfaces
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In Summary
• Optical encoders are proven technology, but with limitations
• New generation of magnetic encoders address shortcomings of earlier magnetic encoders
• More compact, economical kit solutions opens new doors
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