Magnetic Length Sensor MLS (Hybrid)

Transcription

1 Small Hybride Large Hybride AMR gradiet sesor Liear displacemet, movemets, velocities High precisio Various pole pitches available DESCRIPTION Slidig the MLS-Sesors alog a magetic scale will produce a sie ad a cosie output sigal as a fuctio of the positio. I order to deliver satisfyig results, this will be achieved as log as the air gap betwee sesor edge ad magetic scale surface does ot exceed approximately half of the pole pitch. As the sesor priciple is based o the aisotropic mageto resistace effect, the sigal amplitudes are early idepedet o the magetic field stregth ad therefore air gap variatios do ot have a strog effect o the accuracy. The sesor detects a magetic gradiet field ad is thus almost isesitive to homogeous magetic stray fields. Precise displacemet values will be obtaied by usig a sie/cosie decoder device. The maximal obtaiable precisio depeds o the accuracy of the magetic scale ad o the distace sesor magetic scale. Values of <% of the pole pitch are commo. FEATURES APPLICATIONS Si- / cos-output sigals suitable for sigal evaluatio by stadard-asic s Very high precisio Isesitive to air gap fluctuatios Highly reliable Low iterferece field sesitivity Liear displacemet, movemets, velocities i dirty eviromets Very precise agular measuremet usig pole wheels /9

2 SENSOR BASICS The MLS-sesors cosists of two mageto resistive Wheatstoe bridges, whose resistors are placed i a way that i combiatio with a magetic scale, a sie ad a cosie sigal is obtaied. Thus, MLS sesors will oly work together well with pole stripes that meet the desig pole pitch. I additio, some sesor types itegrate over more tha oe pole i order to improve sesor performace. CHARACTERISTIC VALUES PARAMETER SYMBOL CONDITION TYPE MIN TYP MAX UNIT. Operatig Limits max. supply voltage V cc,max 0 V max. curret (both bridges I cc,max MLS000/8 MLS2000/5000 operatig temperature T op C storage temperature T st C 2. Sesor Specificatios (T=25 C Supply voltage V cc 5 V pole pitch * Resistace (both bridges p R b MLS000 MLS2000 MLS5000 MLS8 MLS000 MLS2000/5000 MLS Output sigal rage V /V cc A, B 6 22 mv/v Offset voltage V off A, B mv/v 3. Sesor Specificatios TC of amplitude TCSV A, C %/K TC of resistace TCBR A, C %/K TC of offset TCVoff A, C µv/v/k = ;2 (bridge umber; Stress above oe or more of the limitig values may cause permaet damage to the device. Exposure to limitig values for exteded periods may affect device reliability. * other pole pitches o request ma µm Ω 2/9

3 MEASUREMENT CONDITIONS PARAMETER SYMBOL UNIT CONDITION A. Set Up Coditios ambiet temperature T C T = 25 C (uless otherwise oted supply voltage V cc V Vcc = 5 V applied magetic field H ka/m H > 0 ka/m B. Sesor Specificatios (T=25 C, 360 tur, H=25 ka/m, Vo max>0, Vo mi<0 output sigal rage V / V cc mv/v V / V cc = (V max V mi / V cc sigal offset V off mv/v V off = (V max + V mi / V cc C. Sesor Specificatios (T=-25 C, +25 C ambiet temperatures T C T = -25 C, T 0 = +25 C, T 2 = +25 C TC of amplitude TCSV %/K TC of resistace TCBR %/K TC of offset TCVoff µv/(vk TCV = ( T TCR = ( T TCVoff 2 2 V Vcc T R T V ( T2 Vcc V ( T V cc Voff( T2 Voff = ( T T ( T 00% ( T2 R ( T 00% R ( T 2 ( T = ;2 (bridge umber 3/9

4 PACKAGES HD (SMALL TWO SIDED HYBRID Pi MLS000HD MLS2000HD MLS5000HD MLS8HD GND +V2 +V2 +V2 2 Vcc Vcc Vcc Vcc 3 -V2 GND GND GND 4 +V2 +V +V +V 5 -V -V -V -V2 6 +V -V2 -V2 -V 4/9

5 HK (SMALL HYBRID Pi Aotatio Name Output sigal V cos- 2 Supply voltage V cc 3 Groud GND 4 Output sigal V si- 5 Output sigal V si+ 6 Output sigal V cos+ 5/9

6 HS (STANDARD HYBRID Pi Aotatio Name OR Output sigal V cos- SW Supply voltage V cc BR Groud GND GN Output sigal V si- GE Output sigal V si+ RT Output sigal V cos+ 6/9

7 EVALUATION KIT MLSx000 half milled throughhole Pads Pi Aotatio Name Groud Gd 2 Output sigal V cos+ 3 Output sigal V si+ 4 Supply voltage V cc2 5 Output sigal V si- throughhole Pads, Grid 2mm 6 Output sigal V cos- 7 Supply voltage V cc MLSx000 7/9

8 APPLICATION EXAMPLE Exemplary hardware cofiguratio usig a Aalog Devices AD8605 amplifier for preprocessig MLS5000 sigals for usage with commo Microcotroller TEST REQUIREMENTS The parameters of the MLS sesor are measured i combiatio with a magetic scale. The magetic scale cosists of magetic rubber material, boded o a steel carrier. The pole pitch of the scale has to match to the sesor type (see characteristic values. MEAS ca provide short strips of scales for referece. The maximum used air gap betwee the sesor module ad the scale has to match the sesor type ad ot exceed: MLS000: 0.5mm MLS2000: mm MLS5000: 2.5mm MLS8:.25mm Measuremet directio Test temperature: 25 C MEAS recommeds the use of IC-Haus IC-NQ ASIC for sigal evaluatio. 8/9

9 ORDERING CODES MLS000 MLS2000 MLS5000 MLS8 Large hybrid (HS o request eg. samples G-MRCO-02 eg. samples Small hybrid (HK o request eg. samples G-MRCO-03 eg. samples 2side hybrid (HD G-MRCO-038 G-MRCO-039 G-MRCO-040 G-MRCO-04 ORDERING INFORMATION NORTH AMERICA EUROPE ASIA Measuremet Specialties, Ic. 000 Lucas Way Hampto, VA Uited States Phoe: Fax: sales@meas-spec.com Web: MEAS Deutschlad GmbH Hauert 3 D Dortmud Germay Phoe: +49-( Fax: +49-( ifo.de@meas-spec.com Web: Measuremet Specialties Chia Ltd. No. 26, Lagsha Road High-tech Park (North Nasha District, Shezhe Chia Phoe: Fax: ifo.c@meas-spec.com Web: The iformatio i this sheet has bee carefully reviewed ad is believed to be accurate; however, o resposibility is assumed for iaccuracies. Furthermore, this iformatio does ot covey to the purchaser of such devices ay licese uder the patet rights to the maufacturer. Measuremet Specialties, Ic. reserves the right to make chages without further otice to ay product herei. Measuremet Specialties, Ic. makes o warraty, represetatio or guaratee regardig the suitability of its product for ay particular purpose, or does Measuremet Specialties, Ic. assume ay liability arisig out of the applicatio or use of ay product or circuit ad specifically disclaims ay ad all liability, icludig without limitatio cosequetial or icidetal damages. Typical parameters ca ad do vary i differet applicatios. All operatig parameters must be validated for each customer applicatio by customer s techical experts. Measuremet Specialties, Ic. does ot covey ay licese uder its patet rights or the rights of others. 9/9