AEDB-9340-B-02-C中文资料

AEDB-9340 Series

1250/2500 CPR Commutation Encoder Moduleswith Codewheel

Data Sheet

Description

The AEDB-9340 optical encoder series are six-channeloptical incremental encoder modules with codewheel.The encoder is compliant to RoHS directive and hadbeen declared as a lead free product. When used withcodewheel, these modules detect rotary position. Eachmodule consists of a collimated LED source and detectorIC enclosed within a small plastic package. Due tohighly collimated light source and unique photo detec-tor array designs, these modules are extremely tolerantto mounting misalignment.

The AEDB-9340 optical encoder has integrated commu-tation output (U, V, W), two-channel quadrature outputsplus a third channel index output (A, B, I). This ungatedindex output is a positive index pulse that is generatedonce for each full rotation of the codewheel.

The AEDB-9340 series optical encoder is designed foruse with a codewheel that has an optical radius of15 mm (0.590 inch) for 1250/2500 CPR, 12.3 mm (0.484inch) for 1024/2048 CPR and 12 mm (0.472 inch) for 1000/2000 CPR.

The quadrature, index, commutation signals and powersupplied to encoder are accessed through eight0.46 mm square male connector pins located on 1.27 mm(pitch).

The AEDB-9340 optical encoder provides advancedmotion control detection with integrated commutationoutputs (U, V, and W). It is equivalent to those producedby Hall Switches, thus making it ideal for servo motorapplication. With the AEDB-9340 solution, the system willbe more compact, have reduced alignment time withusage of alignment jig, thus making assembly processmuch easier for housed encoder integration. It hassuperior switching accuracy due to much lowerhysteresis when compared to a Hall Switches. The com-mutation signals can be generated for Brushless DCmotor of different rotor pole-pairs by simply changingwith matching pole-pair codewheel.

Features

Two-channel quadrature output with ungated indexpulse (A, B, I)

Three-channel integrated commutation output (U, V, W) Up to 2500 Cycles Per Revolution (CPR) Easy assembly with alignment jig

Designed to fit into circular shaped housing Up to 150 kHz frequency response –10°C to 85°C operating temperature TTL compatible Single 5 V supply

Integrated feedback device for Brushless DC Motor

Applications

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

Note: Avago Technologies encoders are not recommendedfor use in safety critical applications, e.g., ABS brakingsystems, power steering, life support systems and criticalcare medical equipment. Please contact sales representative

if more clarification is needed.

Theory of Operation

The AEDB-9340 optical encoder is a emitter-detectormodule. Coupled with codewheel, these modules trans-late the rotary motion of a shaft into six-channel digitaloutput.

The modules contain a single Light Emitting Diode(LED) as light source. The light is collimated into aparallel beam by means polycarbonate lens locateddirectly over the LED. Opposite the emitter is a detectorIC. This IC consists of multiple sets of photo detectorsand signal processing circuitry necessary to producedigital waveforms output.

The codewheel rotates between the emitter and detec-tor, causing the light beam to be interrupted by patternof spaces and bars on the codewheel.

The Photodiodes that detect these interruptions arearranged in a pattern that corresponds to the radiusanddesign of the codewheel. These detectors are alsospacedin such away that light period on one pair ofdetectors corresponds to dark period on adjacent pairofdetectors.

The photodiode outputs are then fed through the signalComparators receive these signals and produce the finaloutputs for channels A and B. Due to this integratedphasing technique, the digital output of channel A isinquadrature with that of channel B (90 degrees out ofphase). The commutation feedback (U, V, W) signalsaregenerated based on the codewheel design.

Definitions

Cycles (N): The number of electrical cycles perrevolution(CPR). Note: CPR refers to the raw signal fromencoder, that is the cycles before 4x decode.One Cycle: 360 electrical degrees (°e).One Shaft Rotation: 360 mechanical degrees.

Cycle Error (DC): An indication of cycle uniformity. Thedifference between an observed shaft angle which givesrise to one electrical cycle, and the nominal angularincrement of 1/N of a revolution.

Pulse Width (P): The number of electrical degrees thatan output is high during 1 cycle. This value is nominally180°e or 1/2 cycle.

Pulse Width Error (DP): The deviation, in electricaldegrees, of the pulse width from its ideal value of 180°e.State Width (S): The numbers of electrical degreesbetween transitions in the output of channel A and theneighboring transition in the output of channel B. Thereare 4 states per cycle, each nominally 90°e.

State Width Error (DS): The deviation, in electricaldegrees, of each state width from its ideal value of 90°mutation Accuracy (DI): The deviation, inmechanical degrees, after shaft rotates passing thereference point (Index channel) to the first Channel-Upulse. The measurement from middle of Channel-I torising edge of Channel-U.

Phase (f): The numbers of electrical degrees betweenthe center of the high state of channel A and the centerof the high state of channel B. This value is nominally90°e for quadrature output.

This value is nominally 90°e for quadrature output.Phase Error (Df): The deviation of the phase from itsideal value of 90°e.

Direction of Rotation: When the codewheel rotates inthe clockwise direction viewing from top of themodule(direction from pin U to B), channel A will leadchannel B. If the codewheel rotates in the oppositedirection (direction from pin B to U), channel B willleadchannelA.

Optical Radius (Rop): The distance from thecodewheel’s center of rotation to the optical center(O.C.) of the encoder module.

Index Pulse Width (Po): The number of electricaldegrees that an index is high with reference to channelA or channel B during one full shaft rotation.

AEDB-9340 Technical SpecificationsAbsolute Maximum Ratings

Parameter

Storage TemperatureOperating TemperatureSupply Voltage

SymbolTSTAVCC

Min.-40-10-0.5

Max.85857

Units°C°CVolts

Notes

Recommended Operating Conditions

ParameterTemperature

Supply Voltage (Detector)Operating Frequency

1250 CPR2500 CPRShaft Radial Play Plus EccentricityShaft Axial Play

Min.-104.5

Typ.255.0

Max.855.575150±0.025±0.100

Units°CVoltskHzkHzmm TIRmm

Notes

Ripple < 100 mVppVelocity (rpm) x N/60

Electrical Characteristics

Electrical Characteristics over Recommend Operating Range, Typical at 25°CParameterSupply Current

High Level Output VoltageLow Level Output VoltageRise TimeFall Time

Loading Capacitance

SymbolICCVOHVOLtrtfCLOAD

Min.402.4

Typ.60

Max.800.4

20020

47

UnitsmAVVnsnspF

Notes

CL = 14 pF

Encoding Characteristics

Encoding Characteristics over the Recommended Operating Conditions and Mounting tolerances. These charac-teristics include codewheel contribution. The typical values are average over the full rotation of the codewheeltested at 25°C, 500 RPM, 5V.Parameter

Pulse Width Error

Logic State Width ErrorPhase ErrorCycle ErrorPosition ErrorIndex Pulse Width

1000/1024/1250 CPR2000/2048/2500 CPRSymbolDPDSDfDCDQP0P0

Minimum

Typical7522020150300

Maximum

5050255050360540

Units°e°e°e°emin. of arc

°e°e

90180

Commutation Characteristics (Channel U, V, W)

Encoding Characteristics over the Recommended Operating Conditions and Mounting Conditions. Thesecharacteristics include codewheel contribution. The typical values are average over the full rotation of thecodewheel.

Parameter

Commutation FormatCommutation Accuracy

(Middle of Channel I to Channel U)

Commutation Accuracy (Channel U,V and W)

Symbol

MinimumMaximumThree Phase 4, 6, or 8 poles

-1-2

+1+2

Units

DID UVW°mechanical°mechanical

Device Pinout

Pin #1 start from left side.

Pin12345678

Function

UIVWGroundVCCAB

Package Dimensions

1.000

TOP VIEW

Note: All dimensions are given in mm.

Figure 1a. 1000/1024/1250/2000/2048/2500 CPR encoder module dimensions

Package Dimensions, continued

TOP VIEW

Note: All dimensions are given in mm.

Figure 2a. 1250/2500 CPR encoder module with codewheel dimensions

Mounting Considerations

CBOTTOM VIEW

RECOMMENDED SCREW SIZE: M1.6 x 0.35

RECOMMENDED MOUNTING SCREW TORQUE: 1Lbin (0.113 Nm)

NOTES:

1. ALL DIMENSIONS ARE GIVEN IN mm.

2. USE ALIGNMENT TOOL HEDS-8952 TO MOUNT THE ENCODER WITH RESPECT TO SHAFT CENTER.

3. REFER TO AEDB-9340 SERIES APPLICATION NOTE FOR STEP BY STEP ALIGNMENT AND INSTALLATION PROCEDURE.

Figure 2b. 1250/2500 CPR encoder mounting considerations

Package Dimensions

TOP VIEW

NOTE: ALL DIMENSIONS ARE GIVEN IN mm.

Figure 3a. 1024/2048 CPR encoder module with codewheel dimensions

Mounting Considerations

BOTTOM VIEW

RECOMMENDED SCREW SIZE: M1.6 x 0.35

RECOMMENDED MOUNTING SCREW TORQUE: 1Lbin (0.113 Nm)

NOTES:

1. ALL DIMENSIONS ARE GIVEN IN mm.

2. USE ALIGNMENT TOOL HEDS-8951 TO MOUNT THE ENCODER WITH RESPECT TO SHAFT CENTER.

3. REFER TO AEDB-9340 SERIES APPLICATION NOTE FOR STEP BY STEP ALIGNMENT AND INSTALLATION PROCEDURE.

Figure 3b. 1024/2048 CPR encoder mounting considerations

Package Dimensions

TOP VIEW

NOTE: ALL DIMENSIONS ARE GIVEN IN mm.

Figure 4a. 1000/2000 CPR encoder module with codewheel dimensions

Mounting Considerations

BOTTOM VIEW

RECOMMENDED SCREW SIZE: M1.6 x 0.35

RECOMMENDED MOUNTING SCREW TORQUE: 1Lbin (0.113 Nm)

NOTES:

1. ALL DIMENSIONS ARE GIVEN IN mm.

2. USE ALIGNMENT TOOL HEDS-8950 TO MOUNT THE ENCODER WITH RESPECT TO SHAFT CENTER.

3. REFER TO AEDB-9340 SERIES APPLICATION NOTE FOR STEP BY STEP ALIGNMENT AND INSTALLATION PROCEDURE.

Figure 4b. 1000/2000 CPR encoder module mounting considerations

RIGHT VIEW

NOTES:

1. ALL DIMENSIONS ARE GIVEN IN mm.

2. CODEWHEEL GAP IS ALIGNED AT 0.2 mm FROM DATUM A.

Figure 5. 1000/1024/1250/2000/2048/2500 CPR encoder module and codewheel mounting considerations

Codewheel Mechanical Drawing

–0

+0.01

NOTES:

ALL DIMENSIONS ARE GIVEN IN MILLIMETERS (mm).

B = HUB INTERNAL DIAMETER (BASED ON THE SHAFT DIAMETER OPTION SELECTED). A= CODEWHEEL OUTER DIAMETER.CODEWHEEL CPR 1250/2500 1024/2048 1000/2000

OUTER DIAMETER 35 mm 29.4 mm 29 mm

SECTION A - A

Figure 6. Codewheel and hub dimensions

Output Waveform Specifications

INDEX AND COMMUTATION SIGNALS

Figure 7. Output waveform specification of 2 pole pairs (= 4 poles) forcounterclockwise rotation, viewed from the top.

Note: In the above waveform, quadrature signals A,B are not drawnto scale with respect to index pulse and commutation signals.

Pole vs. State Width Table

Pole468

Number of States/State Width

Mechanical Revolution (Mechanical Degree)

123018202415

Ordering Information

Encoder Bundled with Codewheel

AEDB-9340 –

CPRW = 2500 CPRU = 2048 CPRT = 2000 CPRL = 1250 CPRJ = 1024 CPRB = 1000 CPR

–

Shaft02 = 3 mm04 = 5/32 in05 = 3/16 in06 = 1/4 in11 = 4 mm14 = 5 mm12 = 6 mm13 = 8 mm15 = 10 mm

–

Pole PairA – 2 Pole PairsB – 3 Pole PairsC – 4 Pole Pairs

Encoder Only

AEDS-9340 –

CPRW = 2500 CPRU = 2048 CPRT = 2000 CPRL = 1250 CPRJ = 1024 CPRB = 1000 CPR

– 00

Alignment Tool

HEDS-8950 – Alignment tool for 1000/2000 CPRHEDS-8951 – Alignment tool for 1024/2048 CPRHEDS-8952 – Alignment tool for 1250/2500 CPR

Note: Options highlighted in RED are currently available to order.Contact factory for enquiries on the rest of the options.

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

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. Obsoletes AV01-0248ENAV02-0075EN January 9, 2007

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