Smart Magnets for Smart Product Design: Advanced Topics
Today s Presenter Jason Morgan Vice President Engineering Correlated Magnetics Research 6
Agenda Brief overview of Correlated Magnetics Research Enhancing compatibility in magnetic systems Increasing strength and minimizing interference with shunts Shear resistance in magnetic systems Release behaviors in magnetic systems Q&A Today s webinar is 30 minutes, including Q&A 7
Correlated Magnetics Research Founded in 2008-130 patents to date Smart magnet system design Precision magnetization What we do Magnetic systems design Pre-engineered Polymagnets High volume manufacturing 8
Introduction How do I get more force while limiting magnetic field? How do I improve shear strength in my system? Force (N) 20 10 0-10 -20 Shear Force vs. Lateral Displacement 0 10 20 30 40 50 60 Offset (mm) How can I incorporate release behaviors in magnetic systems? 9
Increased Force While Limiting Magnetic Leakage 10
Strong Force with Limited Magnetic Field Attachment system requirements: Greater than 20 N clamping force Magnetic field under 2000 gauss Sleek product surface - magnet mounted behind injection molded plastic Magnet as small as possible Plas%c'walls'set'design' gap'to'1.5mm' Device Body Accessory 11
Strong Force with Limited Magnetic Field Attachment system requirements: Greater than 20 N clamping force Magnetic field under 2000 gauss Sleek product surface - magnet mounted behind injection molded plastic Magnet as small as possible 27N' Conven%onal'19.1mm'D' x'3.2mm't'disc'magnets' Thicker'magnet' Uncontrolled'flux'leakage' 2360'gauss'at'product'surface' 12
Strong Force with Limited Magnetic Field Attachment system requirements: Greater than 20 N clamping force Magnetic field under 2000 gauss Sleek product surface - magnet mounted behind injection molded plastic Magnet as small as possible CMR'PN'1000569/1000570' 25.4mm'D'x'1.6mm'T' 25N' Thinner'magnet' Controlled'flux'at'product'surface' Op%mized'for'specific'design'gap' 1855'gauss'at'product'surface' 13
Improving Performance with Shunts How to produce more force? 0.5mm steel shunt behind magnets improves efficiency Force increases from 25N to 33N CMR'PN'1000569/1000570' &'0.5mm'steel'shunt' 33N' Steel shunt added to back of magnets 14
Improving Performance with Shunts Holding Force vs. Distance 25.4mm square magnet with great holding force and shear resistance Approximately 20% increase in holding force by using 0.5mm shunt 15
Improving Performance with Shunts Holding Force vs. Distance + Minimize distance between magnet + and target to maximize force 25.4mm square magnet with great holding force and shear resistance Approximately 20% increase in holding force by using 0.5mm shunt 16
Improving Compatibility using Shunts How can we limit field inside our product? 0.5mm steel shunt behind magnet acts as shield Field behind magnet drops significantly, from 1560 gauss to 92 gauss CMR&PN&1000569/1000570& &&0.5mm&steel&shunt& Field&drops&from& 1560&gauss&to&92& gauss&at&2mm&from& the&back&of&the& magnet& 33N& 17
18 Improving Shear Strength
Increase Shear Resistance Shear Force vs. Lateral Displacement 1mm Gap 30 20 10 0-30 -20-10 0 10 20 30 Poor Shear Resistance Conventional magnet offers little shear resistance -10-20 -30 1"L x 0.25"W x 0.125"T Conventional 25.4mm x 6.4mm x 3.2mm conventional 19
Increase Shear Resistance Shear Force vs. Lateral Displacement 1mm Gap 30 20 10 0-30 -20-10 0 10 20 30-10 Poor Shear Resistance Conventional magnet offers little shear resistance CMR PN 1000702/1000703-20 -30 1"L 25.4mm x 0.25"W x 6.4mm x 0.125"T x 3.2mm Conventional conventional 1"L 1000702/1000703 x 0.25"W x 0.125"T Polymagnet Alternating (4 pair Poles) Improved Shear Resistance Shear resistance keeps magnets aligned and system components in place 20
Increase Shear Resistance Shear Force vs. Lateral Displacement 1mm Gap 35 25 Reduced Shear Resistance Narrow magnet has limited shear force along the width 15 5-15 -10-5 0 5 10 15-5 -15-25 -35 CMR PN 1000702/1000703 1"L x 0.25"W x 0.125"T Conventional 1000702/1000703 Polymagnet Pair 21
Increase Shear Resistance Shear Force vs. Lateral Displacement 1mm Gap 35 25 15 5 CMR PN 1000706/1000707-15 -10-5 0 5 10 15-5 -15-25 -35 1"L x 0.25"W x 0.125"T Conventional 1000706/1000707 Polymagnet Pair Improved 2D Shear Resistance This Polymagnet pair gives very good shear resistance along both length and width 22
Radial Shear Resistance Radial Polymagnet Forces vs. Lateral Displacement 1mm Gap 100 80 60 40 20 0-25 -20-15 -10-5 0 5 10 15 20 25-20 -40-60 Poor Shear Resistance Conventional magnet offers little shear resistance in any radial direction 1"OD x 0.125"T Conventional 23
Radial Shear Resistance Radial Polymagnet Forces vs. Lateral Displacement 1mm Gap CMR PN 1000563/1000564 100 80 60 40 20 0-25 -20-15 -10-5 0 5 10 15 20 25-20 -40-60 1"OD x 0.125"T Conventional 1000563/1000564 Great Radial Shear Resistance Polymagnet pairs can offer excellent, customized shear resistance in any direction 24
Radial Shear Resistance Radial Polymagnet Forces vs. Lateral Displacement 1mm Gap CMR PN 1000565/1000566 100 80 60 40 20 0-25 -20-15 -10-5 0 5 10 15 20 25-20 -40-60 1" OD x 0.125"T Conventional 1000563/1000564 1000565/1000566 Great Radial Shear Resistance Polymagnet pairs can offer excellent, customized shear resistance in any direction 25
26 Release Behaviors
Lateral Release Behavior Lateral Shift Release 50.8mm magnet length, 1.5mm gap between magnets 4mm lateral shift drops holding force approximately 75% 6mm lateral shift drops for to zero Polymagnet Clamp Force and Shear Force vs. Lateral Displacement 1.5mm Gap CMR PN 1000319/1000334 25 20 Force (N) 15 10 5 0-5 0 10 20 30 40 50 60 Offset (mm) 1000319/1000334 Polymagnet Pair Shear 1000319/1000334 Polymagnet Pair Clamp 27
Lateral Repel Behavior Lateral Shift Release 50.8mm magnet length, 1.5mm gap between magnets 4mm lateral shift drops holding force to zero 5mm lateral shift provides a repel force Polymagnet Clamp Force and Shear Force vs. Lateral Displacement 1.5mm gap CMR PN 1000708/1000709 Force (N) 30 25 20 15 10 5 0-5 -10-15 -20 0 10 20 30 40 50 60 Offset (mm) 1000708/1000709 Polymagnet Pair Shear 1000708/1000709 Polymagnet Pair Clamp 28
Twist Release Behavior Twist Release 19.05mm disc magnet pair with over 25N force at 1mm gap 45 rotation reduces force to near zero Custom designs tune holding force and release angle 30 25 Twist Release Clamp Force 1mm gap CMR PN 1000710/1000711 20 Force (N) 15 10 5 0-5 -10 0 50 100 150 200 250 300 350 Angle (degrees) 0.75"OD x 0.06125"T Conventional Clamp 1000710/1000711 Polymagnet Pair Clamp 29
Twist Repel Behavior Twist Release 25.4mm disc magnet pair with 85N holding force at 1mm gap 90 rotation produces strong repel force Versatile design for many applications 150 Polymagnet vs. Conventional magnet 1mm gap CMR PN 1000672/1000673 100 50 Force (N) 0-50 0 50 100 150 200 250 300 350-100 -150 Angle (degrees) 1"OD x 0.125"T Conventional Clamp 1000672/1000673 Clamp 30
Layering Features Basic Feature Added Feature Repel Release Latch Detent Centering Spring Latch 31
32 Polymagnets: Smart Magnet Catalog
Technical Sales Representatives Northwest United States and Canada (includes AK, Northern CA, CO, ID, MT, NV, OR, UT, WA, WY and AB, BC) Technical Marketing, Inc. Bellevue, WA (425) 739-4600 Midwest United States and Canada (includes IA, IL, IN, KS, KY, MI, MN, MO, ND, NE, OH, SD, WI and MB, ON ) Motion Mechanisms, Inc. Saint Paul, MN (774) 316-6647 Northeast United States and Canada (includes CT, HI, MA, ME, NH, NY, RI, VT) Correlated Magnetics Huntsville, AL 888-820-9990 Southern California Groh Associates Mission Viejo, CA (949) 837-9871 Southern United States (includes AR, LA, MS, OK, TX ) Blair Engineering Southwest Plano, TX (972) 964-1038 Mid-Atlantic United States (includes DC, DE, MD, NJ, PA, VA, WV) Wafer, Spindler & Associates Baltimore, MD (410) 750-6007 Southeastern United States Blair Engineering Southeast (includes AL, FL, GA, NC, SC, TN) Roswell, GA 770-992-2256 www.polymagnet.com/contact 33
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