AEDS-9240-Y00

AEDS-9240-Y00 Datasheet

AEDS-9240 Series 360/720 CPR Commutation Encoder Module

Part	Datasheet
AEDS-9240-Y00	AEDS-9240-Y00 (pdf)

Related Parts	Information
AEDS-9240-G00	AEDS-9240-G00

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AEDS-9240 Series 360/720 CPR Commutation Encoder Module Data Sheet The AEDS-9240 optical encoder is a six channel optical incremental encoder module. When used with a codewheel, this encoder detects rotary position. Each module consists of a lensed LED source and a detector IC enclosed in a small plastic package. Due to a highly collimated light source and a unique photo detector array, these modules are extremely tolerant to mounting misalignment. The AEDS-9240 encoder is designed with integrated commutation output channels U,V,W , two-channel quadrature outputs A,B , plus a third channel ungated index output I . This ungated index output is a positive index pulse that is generated once for each full rotation of the codewheel. The quadrature, index, commutation signals and power supplied to encoder are accessed through eight 0.46mm square male connector pins located on 1.27mm pitch. The AEDS-9240 optical encoder also provides advanced motion control detection. Its integrated commutation outputs U,V, and W is equivalent to those produced by Hall Switches. Thus, this makes the encoder ideal for servo motor applications. Application of the AEDS-9240 encoder also enables motor systems to be more compact. In addition, the provision of alignment jigs enables a significantly reduced production time and ease of assembly into housed encoders. The encoder also provides superior switching accuracy due to a much lower hysteresis when compared to Hall Switches. Its commutation signals can easily be interchanged for Brushless DC motor of different rotor pole-pairs by simply switching to matching polepair codewheels. • Two-channel quadrature output with ungated index pulse A,B,I Typical applications include industrial printers, plotters, tape drives, industrial and factory automation equipment. Note Avago Technologies encoders are not recommended for use in safety critical application, e.g., ABS braking systems, power steering, life support systems and critical care medical equipment. Please contact sales representative if more clarification is needed. Theory of Operation The AEDS-9240 optical encoder is an emitter/detector module. Coupled with a codewheel, these modules translate the rotary motion of a shaft into a six-channel digital output. The modules contain a single Light Emitting Diode LED as its light source. The light is collimated into a parallel beam by means of a single polycarbonate lens located directly over the LED. Opposite the emitter is the integrated detector circuit. This IC consists of multiple sets of photo detectors and the signal processing circuitry necessary to produce the digital waveforms. The codewheel rotates between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel. The photodiodes that detect these interruptions are arranged in a pattern that corresponds to the radius and design of the code-wheel. These detectors are also deliberately spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pair of detectors. The photodiode outputs are then fed through the signal processing circuitry resulting in A, /A, B, /B, I, and /I. Comparators receive these signals and produce the final outputs for channels A and B. Due to this integrated phasing technique, the digital output of channel A is in quadrature with that of channel B 90 mechanical degrees out of phase . The commutation feedback U, V, W signals are generated based on the codewheel design. Definition One Cycle 360 electrical degrees °e . One Shaft Rotation 360 mechanical degrees. Pulse Width P The number of electrical degrees that an output is high during 1 cycle. This value is nominally 180°e or 1/2 cycle. Pulse Width Error The deviation, in electrical degrees, of the pulse width from its ideal value of 180°e. State Width S The numbers of electrical degrees between transitions in the output of channel A and the neighboring transition in the output of channel B. There are 4 states per cycle, each nominally 90°e. State Width Error The deviation, in electrical degrees, of each state width from its ideal value of 90°e. Commutation Accuracy The deviation, in mechanical degrees, after shaft rotates passes the reference point Index channel to the first U channel pulse. The measurement from middle of channel I to channel U. Phase f The numbers of electrical degrees between the center of the high state of channel A and the center of the high state of channel B. This value is nominally 90 °e for quadrature output. Phase Error The deviation of the phase from its ideal value of 90°e. Direction of Rotation When the codewheel rotates in the clockwise direction viewing from top of the module, channel A will lead channel B. If the codewheel rotates in the opposite direction, channel B will lead channel A. Optical Radius Rop The distance from the codewheel’s center of rotation to the optical center O.C of the encoder module. Index Pulse Width Po The number of electrical degrees that an index is high with reference to channel A or channel B during one full shaft rotation AEDS-9240 Technical Specifications Absolute Maximum Ratings Parameter Storage Temperature Operating Temperature Supply Voltage Min. Recommended Operating Conditions Parameter Min. Typ. Temperature Supply Voltage Detector Operating Frequency 360 CPR 720 CPR Shaft Radial Play Plus Eccentricity Shaft Axial Play Ordering Information Encoder Only AEDS-9240 - G = 360 CPR Y = 720 CPR Alignment Tool HEDS-8953 Alignment tool for 360/720 CPR For product information and a complete list of distributors, please go to our web site: Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies, Limited in the United States and other countries. Data subject to change. Copyright 2007 Avago Technologies Limited. All rights reserved. AV02-0994EN - February 20, 2008

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AEDS-9240 Series 360/720 CPR Commutation Encoder Module

Data Sheet

The AEDS-9240 optical encoder is a six channel optical incremental encoder module. When used with a codewheel, this encoder detects rotary position. Each module consists of a lensed LED source and a detector IC enclosed in a small plastic package. Due to a highly collimated light source and a unique photo detector array, these modules are extremely tolerant to mounting misalignment.

The AEDS-9240 encoder is designed with integrated commutation output channels U,V,W , two-channel quadrature outputs A,B , plus a third channel ungated index output I . This ungated index output is a positive index pulse that is generated once for each full rotation of the codewheel.

The quadrature, index, commutation signals and power supplied to encoder are accessed through eight 0.46mm square male connector pins located on 1.27mm pitch.

The AEDS-9240 optical encoder also provides advanced motion control detection. Its integrated commutation outputs U,V, and W is equivalent to those produced by Hall Switches. Thus, this makes the encoder ideal for servo motor applications. Application of the AEDS-9240 encoder also enables motor systems to be more compact. In addition, the provision of alignment jigs enables a significantly reduced production time and ease of assembly into housed encoders. The encoder also provides superior switching accuracy due to a much lower hysteresis when compared to Hall Switches. Its commutation signals can easily be interchanged for Brushless DC motor of different rotor pole-pairs by simply switching to matching polepair codewheels.
• Two-channel quadrature output with ungated index pulse A,B,I

Typical applications include industrial printers, plotters, tape drives, industrial and factory automation equipment.

Note Avago Technologies encoders are not recommended for use in safety critical application, e.g., ABS braking systems, power steering, life support systems and critical care medical equipment. Please contact sales representative if more clarification is needed.

Theory of Operation

The AEDS-9240 optical encoder is an emitter/detector module. Coupled with a codewheel, these modules translate the rotary motion of a shaft into a six-channel digital output.

The modules contain a single Light Emitting Diode LED as its light source. The light is collimated into a parallel beam by means of a single polycarbonate lens located directly over the LED. Opposite the emitter is the integrated detector circuit. This IC consists of multiple sets of photo detectors and the signal processing circuitry necessary to produce the digital waveforms.

The codewheel rotates between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel.

The photodiodes that detect these interruptions are arranged in a pattern that corresponds to the radius and design of the code-wheel. These detectors are also deliberately spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pair of detectors.

The photodiode outputs are then fed through the signal processing circuitry resulting in A, /A, B, /B, I, and /I. Comparators receive these signals and produce the final outputs for channels A and B. Due to this integrated phasing technique, the digital output of channel A is in quadrature with that of channel B 90 mechanical degrees out of phase . The commutation feedback U, V, W signals are generated based on the codewheel design.

Definition

One Cycle 360 electrical degrees °e .

One Shaft Rotation 360 mechanical degrees.

Pulse Width P The number of electrical degrees that an output is high during 1 cycle. This value is nominally 180°e or 1/2 cycle.

Pulse Width Error The deviation, in electrical degrees, of the pulse width from its ideal value of 180°e.

State Width S The numbers of electrical degrees between transitions in the output of channel A and the neighboring transition in the output of channel B. There are 4 states per cycle, each nominally 90°e.

State Width Error The deviation, in electrical degrees, of each state width from its ideal value of 90°e.

Commutation Accuracy The deviation, in mechanical degrees, after shaft rotates passes the reference point Index channel to the first U channel pulse. The measurement from middle of channel I to channel U.

Phase f The numbers of electrical degrees between the center of the high state of channel A and the center of the high state of channel B.

This value is nominally 90 °e for quadrature output.

Phase Error The deviation of the phase from its ideal value of 90°e.

Direction of Rotation When the codewheel rotates in the clockwise direction viewing from top of the module, channel A will lead channel B. If the codewheel rotates in the opposite direction, channel B will lead channel A.

Optical Radius Rop The distance from the codewheel’s center of rotation to the optical center O.C of the encoder module.

Index Pulse Width Po The number of electrical degrees that an index is high with reference to channel A or channel B during one full shaft rotation

AEDS-9240 Technical Specifications Absolute Maximum Ratings

Parameter Storage Temperature Operating Temperature Supply Voltage

Min.

Recommended Operating Conditions

Parameter

Min.

Typ.

Temperature

Supply Voltage Detector

Operating Frequency 360 CPR 720 CPR

Shaft Radial Play Plus Eccentricity

Shaft Axial Play
Ordering Information Encoder Only

AEDS-9240 -

G = 360 CPR Y = 720 CPR

Alignment Tool HEDS-8953 Alignment tool for 360/720 CPR

For product information and a complete list of distributors, please go to our web site:

Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies, Limited in the United States and other countries. Data subject to change. Copyright 2007 Avago Technologies Limited. All rights reserved. AV02-0994EN - February 20, 2008

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AEDS-9240-Y00 Datasheet file may be downloaded here without warranties.

Datasheet ID: AEDS-9240-Y00 520024