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New POSITAL Hybrid Rotary Encoders Combine Incremental and Absolute Functionality March 11, 2015

Posted by Servo2Go.com in New Product Press Releases.
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POSITAL has introduced new models of its versatile IXARC magnetic encoders that combine incremental and absolute rotation measurement capabilities in a single, compact and highly robust package.  Absolute encoders provide a control system with an accurate report of the rotational angle and rotation-count at a specific point in time, which makes them ideal for many machinery positioning tasks.

Posital IXARC Rotary Magnetic Hybrid Encoder

Posital IXARC Rotary Magnetic Hybrid Encoder

Incremental encoders provide a signal pulse each time the encoder shaft rotates by a specified angle.  Their excellent dynamic response makes them a good choice for monitoring rotational speed and direction.  “Combining both measurement capabilities in a single device provides control system designers with extra flexibility,” underlines POSITAL product manager Chintan Doshi.  “Moreover, the incremental signal can be used as a ‘heartbeat’ that confirms that the sensor is functioning normally.”  Because the new IXARC hybrid encoders are based on POSITAL’s high-performance magnetic measurement technology, they offer a unique combination of accuracy, shock/dust/moisture resistance and compact size.

IXARC hybrid incremental + absolute rotary encoders have communications interfaces that support both measurement modes: RS 422, HTL or TTL for incremental readings and SSI for absolute measurements. Available multi-turn versions can count up to 64,000 revolutions while incremental measurements have resolutions as high as 16,384 pulses per revolution.

Like other POSITAL sensors, the new IXARC hybrid incremental + absolute encoders are available with multiple options for housing size and materials, flange configuration, shaft type and diameter, connection/wiring type and level of environmental protection – up to IP67. POSITAL’s online product finder tool – available at www.posital.com – helps users to quickly and efficiently identify products that will meet their specific requirements.

Click on the link below to view the datasheet on Posital’s line of IXARC magnetic encoders-

http://www.electromate.com/pdf_lib/Posital%20Fraba/Posital_Catalog.pdf

For more information, please contact:

EDITORIAL CONTACT:
Warren Osak
sales@servo2go.com
Toll Free Phone:  877-378-0240
Toll Free Fax:       877-378-0249
www.servo2go.com

 

Tags:   Posital, Fraba, Servo2Go, Incremental Encoder, Absolute Encoder, Magnetic Encoder, Heavy Duty Encoder, IP68, IP69K, Hybrid Encoder

Absolute encoders. A short primer January 15, 2014

Posted by Servo2Go.com in Technical Support Information.
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Reprint of Design World 2012-08-09 Article

Encoders can be either absolute or incremental.  Absolute encoders have a unique code for each shaft position. Or in other words, every position of an absolute encoder is distinctive.  The absolute encoder interprets a system of coded tracks to create position information where no two positions are identical.  Another feature is that absolute encoders do not lose position whenever power is switched off.  Since each position is distinctive, the verification of true position is available as soon as power is switched on.  It is not important to initialize the system by going back to a home base for a reference.

Absolute Encoder Codewheel

Absolute Encoder Codewheel

Absolute encoders can be either single-turn or multi-turn.  Single-turn encoders are well suited to short travel motion control applications where position verification is needed within a single turn of the encoder shaft.  Multi-turn encoders, on the other hand, are better for applications that involve complex or lengthy positioning requirements.

Absolute encoders have a number of advantages.  First is the non-volatility of memory.  An absolute encoder works as a non-volatile position verification device.  True position is not lost if power is lost or the system moves while power is switched off.  A continuous reading of position is not needed.  This is specifically useful in those applications, such as satellite-tracking antennas, where position verification is key.

Absolute encoders also provide programming flexibility.  By removing the need for system homing, the encoders can be controlled to give positioning programs based on setting up reference from point-to-point, rather than from a home position.  Additionally, a microprocessor interface module allows for programming various operating parameters, such as resolution.

Safety is another benefit. In some applications where a loss of position could lead to operator injury or machine damage, an absolute encoder automatically provides position verification when the power is switched on.  Absolute encoders also have good immunity to electrical noise.  The device determines position by frequently reading a coded signal. Stray pulses from electrical noise will not build up and accurate position is presented again on the next reading.

For more information, please contact:

EDITORIAL CONTACT:

Warren Osak
sales@servo2go.com
Toll Free Phone:   877-378-0240
Toll Free Fax:       877-378-0249
www.servo2go.com

Tags:  Encoder, Absolute Encoder, Single-turn encoder, Multi-turn encoder